{"id":11006,"date":"2026-03-09T10:26:00","date_gmt":"2026-03-09T10:26:00","guid":{"rendered":"https:\/\/fsxchemical.com\/?p=11006"},"modified":"2026-08-29T10:27:51","modified_gmt":"2026-08-29T10:27:51","slug":"rotary-screen-vs-flat-screen-thickener-rheology","status":"publish","type":"post","link":"https:\/\/fsxchemical.com\/ru\/blog\/rotary-screen-vs-flat-screen-thickener-rheology\/","title":{"rendered":"Rotary Screen vs. Flat Screen Printing: How Thickener Rheology Requirements Change"},"content":{"rendered":"<p class=\"wp-block-wd-paragraph wd-77a6d042\"><em>Flat-screen and rotary-screen textile printing both force color paste through patterned screen openings, but they do not expose the thickener to the same mechanical history. Flat-screen printing is typically a reciprocating, semi-continuous process in which a squeegee crosses a stationary screen and the screen is then lifted before the fabric advances. Rotary-screen printing is continuous: paste is supplied inside a rotating cylindrical screen while an internal squeegee or magnetic-rod system forces paste through the design at production speed. Because the paste experiences different shear, residence time, recovery and circulation conditions, the rheology that works on one machine may not transfer directly to the other. This guide explains how to compare low-shear body, shear thinning, elasticity, structural recovery and long-run stability before selecting a textile printing thickener.<\/em><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-64e0e86e\">Same Screen-Printing Principle, Different Mechanical History<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8f91c2f0\">Flat-screen and rotary-screen textile printing share the same basic principle:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-12031bf6\"><strong>Printing paste is forced through open areas of a patterned screen and deposited on the fabric.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b54b52a3\">But the mechanics are different.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f94767be\">In flat-screen printing, a flat screen is placed over the fabric, a squeegee traverses the image area, the screen is lifted and the fabric advances to the next repeat.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-636a026a\">In rotary-screen printing, a cylindrical screen rotates continuously with the moving fabric while paste is supplied inside the screen and forced outward through the design openings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6f972768\">Textile process references describe flat-screen printing as a semi-continuous reciprocating process and rotary-screen printing as a continuous, higher-productivity process. Published rotary-screen research also shows that screen mesh, machine settings and print-paste rheology jointly affect paste deposit and penetration.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8627e309\">This leads to the first important rule:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-14e7966b\"><strong>The machine changes the shear history of the paste, so machine selection changes the rheology requirement.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9aa1be23\">That does not mean every rotary paste must be thinner than every flat-screen paste.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0edddcf1\">It means the complete flow-and-recovery profile must match the machine.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-896f06c4\">How Flat-Screen Printing Exposes the Paste to Shear<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-69efda60\">Flat-screen printing is usually intermittent.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3dc66449\">A typical cycle is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bf613567\"><strong>Screen Down \u2192 Squeegee Stroke \u2192 Paste Through Mesh \u2192 Screen Lift \u2192 Fabric Advance \u2192 Next Stroke<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4914468b\">During the squeegee stroke, the paste experiences significant shear as it moves across the screen and through the open mesh.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e4b0d212\">After the stroke, however, part of the paste may remain relatively stationary on the screen before the next cycle.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8e2e9073\">This creates several rheological demands:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Enough low-shear body to prevent uncontrolled spreading<\/li>\n\n\n\n<li>Good flow during the squeegee stroke<\/li>\n\n\n\n<li>Recovery after transfer<\/li>\n\n\n\n<li>Resistance to excessive paste drying or skinning during intermittent dwell<\/li>\n\n\n\n<li>Repeatable viscosity between successive strokes<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-baf88fab\">Flat-screen printing may therefore tolerate a different low-shear structure than a continuous rotary line, but the correct target depends on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Automatic vs. manual flat screen<\/li>\n\n\n\n<li>Stroke speed<\/li>\n\n\n\n<li>Number of squeegee passes<\/li>\n\n\n\n<li>Screen open area<\/li>\n\n\n\n<li>\u0412\u043f\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0430\u044f \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c \u0442\u043a\u0430\u043d\u0438<\/li>\n\n\n\n<li>Time between strokes<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-55054c68\">Do not reduce flat-screen rheology to a rule such as \u201cflat screen needs higher viscosity.\u201d<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-50e18a0d\">How Rotary-Screen Printing Exposes the Paste to Shear<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a321110b\">Rotary-screen printing is continuous.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bc7d7754\">The fabric travels under cylindrical screens while paste is continuously supplied inside each screen.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3769aa37\">An internal blade, roller or magnetic-rod squeegee system forces paste through the pattern.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c25d5bb1\">Commercial rotary systems are designed for high-volume production and consistent long runs.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-30939ced\">This creates a different operating history:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-71902d62\"><strong>Feed \/ Circulation \u2192 Screen Interior \u2192 High Shear at Transfer Zone \u2192 Deposit on Moving Fabric \u2192 Continued Paste Residence and Recirculation<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3174c8ef\">The paste must therefore maintain useful rheology not only for one stroke but through a long, repeated mechanical history.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-978c9c1e\">Important risks include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Progressive viscosity drift<\/li>\n\n\n\n<li>Excessive shear thinning that does not recover<\/li>\n\n\n\n<li>Foam accumulation<\/li>\n\n\n\n<li>Evaporation during long runs<\/li>\n\n\n\n<li>Temperature rise<\/li>\n\n\n\n<li>Deposit variation from beginning to end<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8906e537\">Rotary-screen production often makes long-run rheological stability more commercially visible because even a small change can affect many meters of fabric.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-604bd21c\">Why One Viscosity Number Cannot Define Machine Suitability<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-264503c8\">A Brookfield or rotational-viscometer value is useful only under a defined method.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-66b26b61\">It usually describes one point in the paste&#8217;s flow behavior.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-42e0115c\">Screen printing exposes paste to a range of shear rates.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-938fbe20\">Research on textile printing thickeners shows that both flow and viscoelastic properties are strongly connected with print-quality parameters, and screen-printing studies show that paste behavior changes substantially between low-shear rest conditions and the high-shear conditions present during passage through screen openings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3cd2f5ea\">Therefore, two pastes can both read:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8db6aaf5\"><strong>30,000 mPa\u00b7s<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-485bdbd1\">under one test method and still behave differently in:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u041d\u0430\u0441\u043e\u0441\u043d\u0430\u044f \u043f\u043e\u0434\u0430\u0447\u0430<\/li>\n\n\n\n<li>\u041f\u0435\u0440\u0435\u043d\u043e\u0441 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u0440\u0430\u043a\u0435\u043b\u044f<\/li>\n\n\n\n<li>Mesh passage<\/li>\n\n\n\n<li>Recovery<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0435<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2485aeeb\">The correct comparison is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-22576c7b\"><strong>Low-Shear Body + High-Shear Flow + Elasticity + Recovery + Holding Stability<\/strong><\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-84551b95\">1. Low-Shear Body: Holding the Pattern Before and After Transfer<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-748d1a07\">At low shear, the printing paste needs enough structure to resist uncontrolled movement.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-70d07b15\">This helps support:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0448\u0430\u0431\u043b\u043e\u043d\u0430<\/li>\n\n\n\n<li>Reduced bleeding<\/li>\n\n\n\n<li>Stable paste on the screen<\/li>\n\n\n\n<li>Controlled penetration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8bd38604\">For flat-screen printing, low-shear body can be especially visible during the interval between strokes.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-04cc550e\">For rotary screen, low-shear body remains important after the paste leaves the screen and before drying, but excessive rest viscosity can create problems in feed and transfer.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-74146965\">The correct target is therefore not maximum rest viscosity.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-39a87117\">It is enough structure to control the design without making the paste difficult to move.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-80dab367\">2. Shear Thinning: Flowing Through the Screen<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5fff717f\">Textile printing pastes often need pseudoplastic or shear-thinning behavior.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-164ba5b2\">Under squeegee or screen-transfer shear, apparent viscosity decreases so the paste can move through the screen openings.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5981b422\">Once shear is reduced, the paste can recover part of its original structure.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3cb34c21\">Research on textile printing rheology summarizes the desired balance as:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-80523f50\"><strong>Lower viscosity under high shear for application + Higher viscosity at low shear for pattern control<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fa87dd7e\">If shear thinning is too weak:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Transfer can be incomplete.<\/li>\n\n\n\n<li>Higher pressure may be needed.<\/li>\n\n\n\n<li>Screen filling can become poor.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3e39d09d\">If shear thinning is excessive:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Paste can become too fluid during machine operation.<\/li>\n\n\n\n<li>Penetration can become excessive.<\/li>\n\n\n\n<li>Edges can soften.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-16279fcf\">Rotary lines often reveal excessive long-duration shear thinning more quickly because the paste experiences repeated continuous shear.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-b080c029\">3. Structural Recovery: What Happens After the Paste Leaves the Screen?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0522235a\">After the paste passes through the screen, the shear rate drops sharply.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dacc2495\">The paste should recover enough structure to stop uncontrolled lateral flow.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b4895940\">Recovery that is too slow can lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bleeding<\/li>\n\n\n\n<li>\u0420\u0430\u0437\u043c\u044b\u0442\u044b\u0435 \u043c\u0435\u043b\u043a\u0438\u0435 \u043c\u043e\u0440\u0449\u0438\u043d\u043a\u0438<\/li>\n\n\n\n<li>Haloing<\/li>\n\n\n\n<li>Excess penetration<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e5c98c2f\">Recovery that is too fast or too strong can also create problems if the paste does not level sufficiently after transfer.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-66025b63\">This can contribute to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uneven solid areas<\/li>\n\n\n\n<li>\u0422\u0435\u043a\u0441\u0442\u0443\u0440\u0430 \u043f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u0438<\/li>\n\n\n\n<li>\u041d\u0438\u0437\u043a\u0430\u044f \u0441\u0442\u0435\u043f\u0435\u043d\u044c \u043f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044f<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9e5c71cd\">Flat and rotary machines can therefore prefer different recovery windows depending on:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fabric speed<\/li>\n\n\n\n<li>Time before drying<\/li>\n\n\n\n<li>Paste deposit<\/li>\n\n\n\n<li>Design coverage<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bc371c4e\">Structural recovery should be evaluated on the actual machine, not inferred from static viscosity.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-fc43b567\">4. Elasticity and Stringiness<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d2ee78b5\">Viscoelasticity affects how printing paste deforms and separates from the screen.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-eebf0b7d\">Some elasticity can support recovery.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-28d716a6\">Too much elasticity can create:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stringiness<\/li>\n\n\n\n<li>Poor screen release<\/li>\n\n\n\n<li>Uneven deposit<\/li>\n\n\n\n<li>Tail or edge defects<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-48315729\">Published textile-thickener research notes that elasticity influences both passage through screen openings and subsequent flow through textile fibers.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3f60ebb6\">This property can become especially important when transferring a formula between flat and rotary machines because screen separation mechanics differ.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-17068ea1\">Do not assume a highly elastic paste that performs well on one machine will automatically release cleanly on the other.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-e3d66421\">5. Long-Run Stability: Why Rotary Often Exposes Hidden Weaknesses<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-3c4e509a\">Rotary-screen printing is designed for continuous high-volume production.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7455be42\">That means a paste may remain in the machine system for an extended period while experiencing:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Repeated shear<\/li>\n\n\n\n<li>\u0422\u0438\u0440\u0430\u0436<\/li>\n\n\n\n<li>Mechanical pumping<\/li>\n\n\n\n<li>Air incorporation<\/li>\n\n\n\n<li>Temperature variation<\/li>\n\n\n\n<li>Evaporation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0a7e6de0\">A useful rotary-screen paste should therefore be checked at:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Start of run<\/li>\n\n\n\n<li>After a defined production interval<\/li>\n\n\n\n<li>Mid-run<\/li>\n\n\n\n<li>Near the end of the intended production window<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-343a8d52\">Compare:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0412\u044f\u0437\u043a\u043e\u0441\u0442\u044c<\/li>\n\n\n\n<li>\u041f\u0435\u043d\u0430<\/li>\n\n\n\n<li>Screen running<\/li>\n\n\n\n<li>\u0426\u0432\u0435\u0442\u043e\u043e\u0442\u0434\u0430\u0447\u0430<\/li>\n\n\n\n<li>\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0448\u0430\u0431\u043b\u043e\u043d\u0430<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e746f357\">A paste that gives an excellent 10-meter sample but drifts after 1,000 meters has not passed a realistic rotary-screen qualification.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6e5d65c6\">6. Intermittent Dwell: Why Flat-Screen Paste Can Fail Differently<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6e7824d2\">Flat-screen printing introduces intermittent waiting periods.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4faf0db6\">During these periods, paste on the screen can:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Lose water at the surface<\/li>\n\n\n\n<li>Become locally thicker<\/li>\n\n\n\n<li>Dry around fine openings<\/li>\n\n\n\n<li>Change transfer between strokes<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9fd7a30f\">This creates defects such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fine-mesh blocking<\/li>\n\n\n\n<li>Uneven first stroke after a pause<\/li>\n\n\n\n<li>Increasing squeegee pressure requirement<\/li>\n\n\n\n<li>Pattern inconsistency after machine stops<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-94dc7b4c\">For flat-screen production, evaluate pause\/restart behavior in addition to continuous printing behavior.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1d646a56\">A useful trial can include a controlled machine stop followed by a restart to see whether paste recovery and screen openness remain acceptable.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-8f129472\">Paste Deposit and Penetration<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-81460a6c\">Machine type changes how paste is deposited onto and into the fabric.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a02180d0\">Rotary-screen research has shown that paste application and penetration are affected jointly by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0421\u0435\u0442\u043a\u0430 \u044d\u043a\u0440\u0430\u043d\u0430<\/li>\n\n\n\n<li>Machine settings<\/li>\n\n\n\n<li>\u0420\u0435\u043e\u043b\u043e\u0433\u0438\u044f \u043f\u0430\u0441\u0442\u044b<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2470bd67\">The same thickener can therefore give different:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wet pickup<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>Surface color<\/li>\n\n\n\n<li>K\/S<\/li>\n\n\n\n<li>Print sharpness<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-592d0f4e\">when moved between flat and rotary machines.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8550f8f0\">When transferring a formula, do not adjust viscosity alone.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-acf8739e\">Measure or observe the printed paste deposit and final penetration.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ce4f2c1a\">Screen Mesh and Squeegee Settings Still Matter<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-b1cb6453\">Machine architecture is only one part of the system.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-80e47bec\">Screen mesh, engraving\/open area, squeegee pressure, squeegee type and speed also change the shear and deposit.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fd88b005\">For this article, the important principle is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f1550238\"><strong>Machine Type \u00d7 Screen Geometry \u00d7 Squeegee Conditions \u00d7 Paste Rheology = Printing Result<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a2555d16\">A thickener should not be labeled \u201crotary grade\u201d or \u201cflat-screen grade\u201d without knowing the screen and machine conditions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d4ba4bc7\">Fine mesh can require easier high-shear flow than an open design.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-16410bf1\">Higher pressure can force more paste through the screen and change penetration.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5c5d4e12\">These variables should be recorded during grade matching.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6d2326d9\">Fabric Construction Changes the Required Rheology<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-586b004c\">The same flat or rotary machine can require different paste behavior on different fabrics.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-603ca9ba\">Important variables include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Woven vs. knitted<\/li>\n\n\n\n<li>\u041f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u044c \u0442\u043a\u0430\u043d\u0438<\/li>\n\n\n\n<li>Surface hairiness<\/li>\n\n\n\n<li>\u0412\u043f\u0438\u0442\u044b\u0432\u0430\u044e\u0449\u0430\u044f \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c<\/li>\n\n\n\n<li>\u0420\u0430\u0441\u0442\u044f\u0436\u043a\u0430<\/li>\n\n\n\n<li>Open vs. dense construction<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a994864b\">A highly absorbent cotton fabric may pull paste rapidly into the structure.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f2c30889\">A smooth polyester surface can retain more paste at the surface.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-bd1f556a\">Therefore, machine comparison should always be made on the same fabric when possible.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-eaec36be\">Otherwise, fabric effects can be mistaken for rheology effects.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-bdace3a1\">\u041f\u0435\u0447\u0430\u0442\u044c \u0440\u0435\u0430\u043a\u0442\u0438\u0432\u043d\u044b\u043c\u0438 \u043a\u0440\u0430\u0441\u0438\u0442\u0435\u043b\u044f\u043c\u0438<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2c38f393\">Reactive printing pastes often use sodium alginate or other carefully selected thickeners for cellulosic fabrics.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9b654368\">When moving from flat to rotary screen, evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Complete-paste viscosity after dye and alkali<\/li>\n\n\n\n<li>\u0421\u0434\u0432\u0438\u0433\u043e\u0432\u043e\u0435 \u0440\u0430\u0437\u0436\u0438\u0436\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>\u0427\u0435\u0442\u043a\u043e\u0441\u0442\u044c \u0442\u043e\u043d\u043a\u0438\u0445 \u043b\u0438\u043d\u0438\u0439<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>Color yield after steaming<\/li>\n\n\n\n<li>\u0421\u043c\u044b\u0432\u0430\u0435\u043c\u044b\u0439<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-53a164ac\">The same sodium alginate concentration may need adjustment if the rotary machine produces a different deposit or penetration.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f63f4447\">However, do not make a dosage change before measuring the actual print result.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-ce10e024\">\u0414\u0438\u0441\u043f\u0435\u0440\u0441\u043d\u0430\u044f \u043f\u0435\u0447\u0430\u0442\u044c<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6e1125e0\">Polyester disperse screen printing adds another requirement: the thickener must release the dye effectively during thermal fixation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0f832423\">A paste can run well on a rotary screen but still reduce final K\/S if the thickener film restricts dye release.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cc81e568\">When comparing flat and rotary disperse printing, check:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0421\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0434\u0435\u0440\u0436\u0430\u043d\u0438\u044f<\/li>\n\n\n\n<li>Screen running<\/li>\n\n\n\n<li>Printed deposit<\/li>\n\n\n\n<li>Thermal fixation<\/li>\n\n\n\n<li>Final K\/S<\/li>\n\n\n\n<li>Wash-off \/ reduction clearing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cfeed4f5\">Machine rheology and thermal-fixation performance must both pass.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-6b141b3b\">\u041f\u0438\u0433\u043c\u0435\u043d\u0442\u043d\u0430\u044f \u043f\u0435\u0447\u0430\u0442\u044c<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f0100ce2\">Pigment printing adds binder to the rheology problem.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2ecdcbb6\">The complete paste may contain:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pigment dispersion<\/li>\n\n\n\n<li>Binder<\/li>\n\n\n\n<li>\u0417\u0430\u0433\u0443\u0441\u0442\u0438\u0442\u0435\u043b\u044c<\/li>\n\n\n\n<li>Fixer<\/li>\n\n\n\n<li>Auxiliaries<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6c01546f\">When changing machine type, evaluate whether the binder\/thickener system maintains:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Screen transfer<\/li>\n\n\n\n<li>\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0448\u0430\u0431\u043b\u043e\u043d\u0430<\/li>\n\n\n\n<li>\u0421\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0434\u0435\u0440\u0436\u0430\u043d\u0438\u044f<\/li>\n\n\n\n<li>Curing performance<\/li>\n\n\n\n<li>Fabric hand<\/li>\n\n\n\n<li>\u0421\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c \u043a \u0438\u0441\u0442\u0438\u0440\u0430\u043d\u0438\u044e<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f791ea95\">Do not increase thickener only to solve a machine-transfer problem if the extra polymer solids worsen hand after curing.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-39640f2a\">How to Transfer a Paste from Flat Screen to Rotary Screen<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-00037e7d\">Do not begin by changing several formulation variables at once.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-659cefd7\">Step 1: Use the Existing Flat-Screen Paste as the Reference<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-81d9ea91\">Record:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thickener grade<\/li>\n\n\n\n<li>\u041a\u043e\u043d\u0446\u0435\u043d\u0442\u0440\u0430\u0446\u0438\u044f<\/li>\n\n\n\n<li>\u041c\u0435\u0442\u043e\u0434 \u0438\u0437\u043c\u0435\u0440\u0435\u043d\u0438\u044f \u0432\u044f\u0437\u043a\u043e\u0441\u0442\u0438<\/li>\n\n\n\n<li>\u0422\u043a\u0430\u043d\u044c<\/li>\n\n\n\n<li>Screen<\/li>\n\n\n\n<li>Squeegee conditions<\/li>\n\n\n\n<li>Printed result<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-29440d1e\">Step 2: Run the Same Paste on Rotary at Controlled Speed<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-84713c04\">Observe:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Feed stability<\/li>\n\n\n\n<li>\u041e\u0442\u0440\u044b\u0432\u043e\u043a \u0441 \u044d\u043a\u0440\u0430\u043d\u0430<\/li>\n\n\n\n<li>Deposit<\/li>\n\n\n\n<li>\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0448\u0430\u0431\u043b\u043e\u043d\u0430<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0435<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-11dca591\">Step 3: Check Long-Run Change<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a65df567\">Recheck paste and print after a meaningful production interval.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-b99aa0df\">Step 4: Adjust One Rheology Variable at a Time<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cc40ce17\">Possible directions include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thickener concentration<\/li>\n\n\n\n<li>Grade \/ molecular structure<\/li>\n\n\n\n<li>Compound-thickener ratio<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-abf95898\">Do not assume the rotary version simply needs a lower viscosity.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-b1c6cd09\">How to Transfer a Paste from Rotary Screen to Flat Screen<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ab9afb3a\">The reverse transfer requires a different check.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d51c6ac5\">A paste optimized for continuous rotary running may show:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Too much spreading during flat-screen dwell<\/li>\n\n\n\n<li>Different recovery after the squeegee stroke<\/li>\n\n\n\n<li>Screen drying during pauses<\/li>\n\n\n\n<li>Different paste deposit from multiple strokes<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5c78bab8\">Run the same paste first, then evaluate whether:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Low-shear body needs adjustment<\/li>\n\n\n\n<li>Recovery needs adjustment<\/li>\n\n\n\n<li>Water retention needs improvement<\/li>\n\n\n\n<li>The number of squeegee strokes should change<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7bb143b4\">Again, change the minimum number of variables needed to identify the cause.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-c4c5584f\">Laboratory Rheology Test Plan<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-8f994964\">For a technical comparison, use the complete printing paste rather than the thickener stock solution alone.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4f74d914\">At minimum, standardize:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thickener concentration<\/li>\n\n\n\n<li>\u0412\u043e\u0434\u0430<\/li>\n\n\n\n<li>Dye\/pigment\/binder formula<\/li>\n\n\n\n<li>\u0422\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430<\/li>\n\n\n\n<li>\u0413\u0438\u0434\u0440\u0430\u0442\u0430\u0446\u0438\u044f<\/li>\n\n\n\n<li>\u0412\u0440\u0435\u043c\u044f \u0443\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u044f<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-a231eaa0\">Measure:<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-852b9ff0\">Low-Shear Viscosity<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6461a9b6\">Represents paste body during storage\/rest conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-74c7e70c\">Higher-Shear Viscosity<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-da543680\">Shows how easily the paste flows under application stress.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-9d91ab12\">Recovery<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5e67b227\">Measure whether viscosity\/structure rebuilds after a high-shear interval.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-f41c32bd\">Viscoelasticity Where Equipment Is Available<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-15c0f064\">Storage\/loss response can help identify excessively elastic or weak-gel behavior.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-40ddddc3\">If the mill does not have a rheometer, build a practical correlation using:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Multiple viscometer speeds<\/li>\n\n\n\n<li>Controlled high-speed mixing<\/li>\n\n\n\n<li>Recovery measurement after mixing<\/li>\n\n\n\n<li>Standardized screen-print trials<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0c8451b3\">The laboratory target is to reproduce machine-relevant behavior, not to generate rheology data with no production connection.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-5e01e518\">Production Trial and Approval Criteria<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-92e2c8f2\">Approve a thickener for flat or rotary screen only after production-scale validation.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-662269f6\">Record:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Machine type<\/li>\n\n\n\n<li>\u0421\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0442\u0430\u043d\u043a\u0430<\/li>\n\n\n\n<li>Screen specification<\/li>\n\n\n\n<li>Squeegee type\/settings<\/li>\n\n\n\n<li>Fabric lot<\/li>\n\n\n\n<li>Paste batch<\/li>\n\n\n\n<li>Starting viscosity<\/li>\n\n\n\n<li>Mid-run viscosity<\/li>\n\n\n\n<li>End-run viscosity<\/li>\n\n\n\n<li>Print quality<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c384c6e7\">Evaluate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Beginning-to-end shade consistency<\/li>\n\n\n\n<li>\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0448\u0430\u0431\u043b\u043e\u043d\u0430<\/li>\n\n\n\n<li>\u041f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u0435<\/li>\n\n\n\n<li>Screen cleanliness<\/li>\n\n\n\n<li>\u041f\u0435\u043d\u0430<\/li>\n\n\n\n<li>Machine interruptions<\/li>\n\n\n\n<li>Final K\/S \/ fastness \/ hand after full processing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e46ad366\">The approval target should be an operating window, not one perfect sample.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-2c8838a1\">Troubleshooting Flat vs. Rotary Screen Problems<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u0412\u044b\u044f\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430<\/th><th>First Variables to Check<\/th><th>Do Not Assume<\/th><\/tr><\/thead><tbody><tr><td>Paste works on flat but spreads on rotary<\/td><td>Shear thinning, recovery, deposit, machine speed<\/td><td>Rotary always needs a thicker paste<\/td><\/tr><tr><td>Paste works on flat but transfers poorly on rotary<\/td><td>High-shear flow, screen geometry, feed stability<\/td><td>Higher squeegee pressure is the only solution<\/td><\/tr><tr><td>Paste works on rotary but blocks during flat-screen pauses<\/td><td>Water retention, surface drying, dwell time<\/td><td>The thickener is unsuitable in all flat-screen systems<\/td><\/tr><tr><td>Rotary quality drifts during a long run<\/td><td>Shear history, temperature, foam, evaporation, holding stability<\/td><td>The initial viscosity proves long-run stability<\/td><\/tr><tr><td>Same viscosity gives different penetration<\/td><td>Screen, squeegee, rheology, fabric<\/td><td>Same Brookfield value means same application<\/td><\/tr><tr><td>Fine lines improve but solid areas become uneven<\/td><td>Recovery, leveling, paste deposit<\/td><td>Maximum structural recovery is always best<\/td><\/tr><tr><td>Machine transfer improves but final color drops<\/td><td>Deposit, dye mobility, fixation, wash-off<\/td><td>Machine rheology alone defines product suitability<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-9a18d5b9\">\u041e\u0431\u0449\u0430\u044f \u0441\u0442\u043e\u0438\u043c\u043e\u0441\u0442\u044c \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d3698674\">Machine-specific rheology affects more than print quality.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-e7c6c98b\">Include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Thickener dosage<\/li>\n\n\n\n<li>\u041f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043a\u0430 \u043f\u0430\u0441\u0442\u044b<\/li>\n\n\n\n<li>Pumping energy<\/li>\n\n\n\n<li>\u0421\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0442\u0430\u043d\u043a\u0430<\/li>\n\n\n\n<li>Screen interruptions<\/li>\n\n\n\n<li>Waste paste<\/li>\n\n\n\n<li>Rework<\/li>\n\n\n\n<li>Final washing or curing<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0c48a8de\">A useful framework is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1c55246b\"><strong>Total Cost in Use = Thickener Cost + Preparation + Machine Efficiency + Downtime + Post-Treatment + Rework + Quality Loss<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-0e75224a\">A thickener that costs more per kilogram can be the lower-cost rotary route if it maintains long-run viscosity and reduces interruptions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-dcfa1c34\">A lower-cost product can be the better flat-screen route if it provides stable print definition without drying on the screen.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-371ca18d\">Compare cost per acceptable printed meter, not powder price alone.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-da4ace62\">What Information Should You Send to a Thickener Supplier?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-fef6317d\">For useful flat-vs-rotary grade matching, provide:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Flat or rotary screen<\/li>\n\n\n\n<li>Machine manufacturer\/model where relevant<\/li>\n\n\n\n<li>Production speed<\/li>\n\n\n\n<li>Screen mesh\/engraving<\/li>\n\n\n\n<li>Squeegee type and settings<\/li>\n\n\n\n<li>\u0421\u043e\u0441\u0442\u0430\u0432 \u0438 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u0442\u043a\u0430\u043d\u0438<\/li>\n\n\n\n<li>Dye\/pigment route<\/li>\n\n\n\n<li>Current thickener product\/TDS<\/li>\n\n\n\n<li>\u0422\u0435\u043a\u0443\u0449\u0430\u044f \u0434\u043e\u0437\u0438\u0440\u043e\u0432\u043a\u0430<\/li>\n\n\n\n<li>Viscosity and full test method<\/li>\n\n\n\n<li>Complete or simplified formula<\/li>\n\n\n\n<li>Paste holding time<\/li>\n\n\n\n<li>Current defect: spreading, transfer, blocking, drift, penetration or cost<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-32d9a641\">FSX Chemical can use this information through <a href=\"https:\/\/fsxchemical.com\/ru\/%d1%83%d1%81%d0%bb%d1%83%d0%b3%d0%b0\/%d1%81%d0%be%d0%be%d1%82%d0%b2%d0%b5%d1%82%d1%81%d1%82%d0%b2%d1%83%d1%8e%d1%89%d0%b8%d0%b5-%d0%be%d0%b1%d1%80%d0%b0%d0%b7%d1%86%d1%8b\/\">\u041e\u0431\u0440\u0430\u0437\u0446\u044b \u0438 \u043f\u043e\u0434\u0431\u043e\u0440<\/a> to compare sodium alginate, CMC, CMS or other route-appropriate thickeners under matched machine conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-cb8d7ae4\">How Should Thickener Rheology Be Matched to Flat or Rotary Screen?<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-6c26afdd\">A practical decision chain is:<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7833518d\"><strong>Machine Mechanics \u2192 Shear History \u2192 Low-Shear Body \u2192 High-Shear Flow \u2192 Recovery \u2192 Paste Deposit \u2192 Finished Print \u2192 Long-Run Repeatability<\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-55e59abe\">The key principles are:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Flat and rotary screen use the same transfer principle but expose paste to different mechanical histories.<\/strong><\/li>\n\n\n\n<li><strong>Same viscosity does not mean the same flow, recovery or machine behavior.<\/strong><\/li>\n\n\n\n<li><strong>Rotary production places strong emphasis on continuous shear and long-run stability.<\/strong><\/li>\n\n\n\n<li><strong>Flat-screen production adds intermittent dwell, pause\/restart and screen-drying risks.<\/strong><\/li>\n\n\n\n<li><strong>Screen mesh, squeegee and fabric must be recorded before changing the thickener.<\/strong><\/li>\n\n\n\n<li><strong>The final acceptance standard is stable production and finished-print quality\u2014not a viscosity number alone.<\/strong><\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-f6c09d9e\">\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-95d65a6d\">1. Does rotary-screen printing need lower-viscosity paste than flat-screen printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-d7977925\">Not as a universal rule. Rotary printing often needs excellent high-shear flow and long-run stability, while flat screen can place more emphasis on low-shear hold and pause\/restart behavior. Test the actual machine.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-66c9aeda\">2. Why can the same paste work on flat screen but fail on rotary screen?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-ba67e4c5\">Rotary printing exposes the paste to continuous feed, repeated shear, circulation and longer machine residence. A paste can therefore drift or thin differently during a long run.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-cc0ebedf\">3. Why can a rotary paste fail on flat screen?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-cc37ffa4\">Flat-screen dwell between strokes can expose weak low-shear body, slow structural recovery or surface drying that was less visible on the continuous rotary line.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-08d7f1f6\">4. Is Brookfield viscosity enough to select a thickener?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-2ad2fae9\">No. It should be combined with shear-thinning, recovery, elasticity and machine-print testing.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-8eed4baa\">5. What rheology is generally useful for screen printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-09fec3a3\">A useful paste often has sufficient viscosity at low shear, lower apparent viscosity under application shear and enough recovery after transfer to control spreading.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-05e6cc7e\">6. Does faster rotary speed always require lower paste viscosity?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1d4b8821\">No. Speed changes shear, residence and deposit conditions, but the correct adjustment can involve rheology, screen specification, squeegee settings or thickener grade\u2014not viscosity alone.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-20c06bd6\">7. Why does rotary print quality change from the beginning to the end of a run?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-5496baaa\">Check repeated shear, paste temperature, evaporation, foam, holding stability and feed conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-079baf68\">8. Why does flat-screen paste dry in the screen?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-593c3e20\">Possible causes include long dwell, low humidity, excessive paste concentration, poor water retention or fine mesh. Diagnose the complete system.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-0d57d4ff\">9. Does higher structural recovery always give sharper printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-4a0d12be\">No. Excessively fast or strong recovery can reduce leveling and cause uneven solid areas. The target is a balanced recovery window.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-c6085344\">10. Can the same sodium alginate grade be used for both flat and rotary reactive printing?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-057f6e16\">Often it can be evaluated on both, but concentration and process settings may need adjustment. Approve the grade on each machine.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-5231fbf1\">11. Should I change thickener before changing screen or squeegee settings?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f6bdf72e\">Not automatically. Machine settings and rheology interact. Record the current screen\/squeegee conditions and change one major variable at a time.<\/p>\n\n\n\n<h3 class=\"wp-block-wd-title title wd-53a48e4c\">12. What should I send FSX Chemical for flat-vs-rotary matching?<\/h3>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-7382e71d\">Send machine type, speed, screen, squeegee conditions, fabric, dye route, current thickener, dosage, viscosity method, formula and the current machine defect.<\/p>\n\n\n\n<h2 class=\"wp-block-wd-title title wd-7693ca62\">Match Thickener Rheology to Your Flat or Rotary Screen<\/h2>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-c5b5c172\">If the same printing paste behaves differently after moving between flat and rotary screen machines, FSX Chemical can help determine whether the next trial should focus on thickener grade, concentration, shear recovery or machine\/process conditions.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-979d1417\">For a useful technical comparison, send:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your current thickener sample, TDS or COA<\/li>\n\n\n\n<li>Flat or rotary screen<\/li>\n\n\n\n<li>\u0421\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u0441\u0442\u0430\u043d\u043a\u0430<\/li>\n\n\n\n<li>Screen mesh\/engraving<\/li>\n\n\n\n<li>Squeegee type\/settings<\/li>\n\n\n\n<li>\u0421\u043e\u0441\u0442\u0430\u0432 \u0438 \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u0442\u043a\u0430\u043d\u0438<\/li>\n\n\n\n<li>Dye\/pigment route<\/li>\n\n\n\n<li>Current thickener dosage<\/li>\n\n\n\n<li>\u0412\u044f\u0437\u043a\u043e\u0441\u0442\u044c \u0438 \u043f\u043e\u043b\u043d\u0430\u044f \u043c\u0435\u0442\u043e\u0434\u0438\u043a\u0430 \u0438\u0441\u043f\u044b\u0442\u0430\u043d\u0438\u0439<\/li>\n\n\n\n<li>Complete or simplified formula<\/li>\n\n\n\n<li>Paste holding time<\/li>\n\n\n\n<li>Current screen-running, spreading, penetration, color or cost target<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-f2c73d51\">\u041d\u0430\u0447\u043d\u0438\u0442\u0435 \u0441 <a href=\"https:\/\/fsxchemical.com\/ru\/%d1%83%d1%81%d0%bb%d1%83%d0%b3%d0%b0\/%d1%81%d0%be%d0%be%d1%82%d0%b2%d0%b5%d1%82%d1%81%d1%82%d0%b2%d1%83%d1%8e%d1%89%d0%b8%d0%b5-%d0%be%d0%b1%d1%80%d0%b0%d0%b7%d1%86%d1%8b\/\">\u041e\u0431\u0440\u0430\u0437\u0446\u044b \u0438 \u043f\u043e\u0434\u0431\u043e\u0440<\/a> for a controlled machine comparison.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1e9ee2a9\">\u041e\u0431\u0437\u043e\u0440 <a href=\"https:\/\/fsxchemical.com\/ru\/product\/%d0%b0%d0%bb%d1%8c%d0%b3%d0%b8%d0%bd%d0%b0%d1%82-%d0%bd%d0%b0%d1%82%d1%80%d0%b8%d1%8f\/\">\u0410\u043b\u044c\u0433\u0438\u043d\u0430\u0442 \u043d\u0430\u0442\u0440\u0438\u044f<\/a>, <a href=\"https:\/\/fsxchemical.com\/ru\/product\/%d0%ba%d0%b0%d1%80%d0%b1%d0%be%d0%ba%d1%81%d0%b8%d0%bc%d0%b5%d1%82%d0%b8%d0%bb%d1%86%d0%b5%d0%bb%d0%bb%d1%8e%d0%bb%d0%be%d0%b7%d0%b0-cmc\/\">CMC<\/a>, <a href=\"https:\/\/fsxchemical.com\/ru\/product\/%d0%ba%d0%b0%d1%80%d0%b1%d0%be%d0%ba%d1%81%d0%b8%d0%bc%d0%b5%d1%82%d0%b8%d0%bb%d0%ba%d1%80%d0%b0%d1%85%d0%bc%d0%b0%d0%bb-cms\/\">CMS<\/a> \u0438 <a href=\"https:\/\/fsxchemical.com\/ru\/product\/%d0%bf%d0%b0%d1%81%d1%82%d0%b0-%d0%b4%d0%bb%d1%8f-%d1%86%d0%b8%d1%84%d1%80%d0%be%d0%b2%d0%be%d0%b9-%d0%bf%d0%b5%d1%87%d0%b0%d1%82%d0%b8\/\">\u041f\u0430\u0441\u0442\u0430 \u0434\u043b\u044f \u0446\u0438\u0444\u0440\u043e\u0432\u043e\u0439 \u043f\u0435\u0447\u0430\u0442\u0438<\/a> for route-specific thickener information.<\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-1949c9fa\">You can also <a href=\"https:\/\/fsxchemical.com\/ru\/%d1%83%d1%81%d0%bb%d1%83%d0%b3%d0%b0\/%d0%b7%d0%b0%d0%bf%d1%80%d0%be%d1%81%d0%b8%d1%82%d1%8c-%d1%80%d0%b0%d1%81%d1%86%d0%b5%d0%bd%d0%ba%d0%b8\/\">\u0417\u0430\u043f\u0440\u043e\u0441\u0438\u0442\u044c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435 \u043d\u0430\u043f\u0440\u044f\u043c\u0443\u044e \u043e\u0442 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044f<\/a> after the suitable rheology route is confirmed or <a href=\"https:\/\/fsxchemical.com\/ru\/%d1%81%d0%b2%d1%8f%d0%b6%d0%b8%d1%82%d0%b5%d1%81%d1%8c-%d1%81-%d0%bd%d0%b0%d0%bc%d0%b8\/\">\u0421\u0432\u044f\u0437\u0430\u0442\u044c\u0441\u044f \u0441 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 FSX Chemical<\/a> for technical discussion\ud83d\udce7\u00a0<strong>\u042d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u043d\u0430\u044f \u043f\u043e\u0447\u0442\u0430<a href=\"https:\/\/fsxchemical.com\/ru\/%d1%81%d0%b2%d1%8f%d0%b6%d0%b8%d1%82%d0%b5%d1%81%d1%8c-%d1%81-%d0%bd%d0%b0%d0%bc%d0%b8\/\">: Service@fsxchemical.com<\/a><\/strong><\/p>\n\n\n\n<p class=\"wp-block-wd-paragraph wd-9a22b709\"><strong>The most useful question is not \u201cWhich viscosity is best for rotary or flat screen?\u201d It is \u201cWhat rheological profile gives stable transfer, recovery and print quality under this machine&#8217;s real shear history?\u201d<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>Flat and rotary screen printing use the same basic transfer principle but expose printing paste to different shear and residence histories. The correct thickener should therefore be selected by low-shear body, high-shear flow, recovery, elasticity and machine stability rather than viscosity alone.<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"Rotary Screen vs. Flat Screen Printing: How Thickener Rheology Requirements Change","_seopress_titles_desc":"Learn how flat and rotary screen printing change thickener rheology requirements, including shear thinning, recovery, screen transfer, penetration and long-run stability.","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","footnotes":""},"categories":[1],"tags":[1184,395,1381,1183,1126,1506,1369],"class_list":["post-11006","post","type-post","status-publish","format-standard","hentry","category-technical-guides","tag-flat-screen-printing","tag-printing-paste","tag-rheology","tag-rotary-screen-printing","tag-screen-printing","tag-shear-thinning","tag-textile-thickener"],"acf":[],"_links":{"self":[{"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/posts\/11006","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/comments?post=11006"}],"version-history":[{"count":2,"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/posts\/11006\/revisions"}],"predecessor-version":[{"id":11008,"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/posts\/11006\/revisions\/11008"}],"wp:attachment":[{"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/media?parent=11006"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/categories?post=11006"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fsxchemical.com\/ru\/wp-json\/wp\/v2\/tags?post=11006"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}