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 \nDr.J.Trauter  \nThe ITR has proposed the use of grooved rolls toreduce the hairiness of sized yarns (1,2).  In this methodeach individual yarn passes through its own groove and isthus smoothed.   The rate of revolution of the roll is ad-justed such that a relative motion between the warp yarnsand the groove is obtained.   This way,the sur face hairscan be pressed into the yarn bundle.  Since about 458 ofthe yarn circumference touches the bottom or the sides ofthe groove,it is possible to reduce yarn hairiness signi-ficantly;if both sides of the yarn are smoothed,hairinessdecreases by about 90%.  \nThe smoothing of the yarns has to take place in the\"wet phase\"of the drying process,before the size solidifieson the yarn surface.   It was precisely this requirementwhich gave us difficulties in the beginning of our experi-ments.  With the equipment at rest,sticky substances wereformed between the yarns and the grooves(even when thegrocved rolls were made from TEFLON⑧),which caused yarnbreaks at start-up.  \nTo eliminate these difficulties we changed the designof the grooved roll.  The roller cover which contains thegrooves,and which originally was made from TEFLON®,wasreplaced with a tube made from sintered high-grade steel.This material was chosen because its porosity makes itpossible to squeeze a preparation from the inside of theroll through the pores (3)and thus to lubricate the areaof contact between yarn and groove.  The lubricating filmprevents the formation of gummy materials between the yarnsand the grooves.  \nExperiences with this technique lead us to the proposalto use sintered yrooved rolls for the application of size onwarp yarns.  Instead of the coating size solution should besqueezed to the bottom of the grooves and from there trans-ferred onto the unsized yarns.  \nIf this system is indeed applicable to warp sizing,the usual trough containing the size could be eliminated.only the sintered grooved roll(or grooved feed roll)wouldbe required for size application.  \nDigitized by the Internet Archivein 2019  \nhttps://archive.org/details/sinteredgroovedrOOtrau  \nResults of the initial tests with the sintered  \ngrooved roll were positive.  Even without extensive experi-mentation and firm conclusions as to the applicability ofthe equipment for sizing operations,one can already as-certain that the grooved roll offers the potential toregulate the degree of sizing,so that it can be matchedto the requirements of the material and the speed of thewarp.  \nThe following parameters are available for varyingthe degree of sizing:  \n## a)  Dimensions which can be selected when the systemis constructed:\n\n-Diameter and wall strength of the grooved roll.  \n-Porosity of the high-grade steel.  \n## b)  Values which can be varied during sizing:\n\n-Pressure of the liquid inside the roll.-Rate of revolution of the grooved roll(thiswill influence the pressure of the liquid).-Size concentration.  \n-Viscosity of the sizing solution;if neededthe viscosity can be increased throuyhaddition of a thickener.   Use of thickenersin sizing of filament yarns is already stateof the art.  \nAccording to results available to date it is possibleto regulate the degree of sizing as a function of the warpvelocity through the pressure of the liquid alone.  Thus itis possible to assure constant size concentration in thetransition phase from slow start-up to high-speed operation.  \nIn addition,the data make us expect that the size-uptake can be limited to values customary in conventionalsizing operations(including high-pressure padding).  \nWe see the following advantages in the system:  \n## a)  The grooved roll carries out two essential functionsof the sizing operation which till now were carried outseparately:\n\n-In preparation of continuous filament warpsthe grocved roll functions as the applicationequipment and also the element to ensureseparation of individual yarn bundles;thegr","cbCaiog7ByOYfCdf","https://ap.wps.com/l/cbCaiog7ByOYfCdf","pdf",795925,"English","# Overview\n## Wet-phase requirement and initial difficulties\n## Design change and lubrication via sintered steel pores\n## Initial test results and sizing control parameters\n# System functions and advantages\n## Dual functions: application and yarn separation/smoothing\n## Eliminating problems in conventional troughs\n## Coverage of yarn circumference and required additional equipment\n# Limitations and technical considerations\n## Standstill handling, emptying and cleaning\n## Manufacturing cost and uniformity of size uptake\n## Warp density and end count constraints","[{\"question\":\"烧结沟槽辊系统如何降低纱线毛羽？\",\"answer\":\"通过让单根纱线穿过自身沟槽并实现相对运动，将沟槽表面的毛羽/表面纤维压入纱线束中；单面平滑可显著降低毛羽，双面平滑可进一步降低约90%。\"},{\"question\":\"为什么强调在干燥过程的“湿相”进行平滑？\",\"answer\":\"因为上浆固化前需要在纱线表面处于湿相阶段完成平滑处理；一旦固化，难以实现所需的毛羽压入与铺展效果。\"},{\"question\":\"从特氟龙辊套改为烧结高等级钢管的主要目的是什么？\",\"answer\":\"为了避免设备静止时纱线与沟槽之间黏连导致启动断纱；烧结钢的孔隙可使制剂从辊内挤出并润滑纱线与沟槽接触区域，从而防止黏糊材料形成。\"}]","SINTERED GROOVED ROLLS - A SYSTEM TO APPLY SIZE TO BANDS OF YARN? | PDF",1789965480]