IL32683A - Textured yarn dyeing process and product - Google Patents

Description

This invention relates to an improved method of preparing dyed textured filament yarns of synthetic such as copolymers of a and a copolymers two different types of and copolymers of two different types of of the procedures of a to a ilament yarn of a synthetic is the which produces a crinkle this the yam is tightly knit into a tubing on a circular knitting machine and the tubing is heated sufficiently to cause the yam to be set the convolutions caused by knitted She knit tubing is then to provide a yam which has characteristic texture and Fabrics ya s have a characteristic handle and appearance while desirable for some are unsuitable for of other known procedures in the textile industry for producing of synthetic polymers are the texturing operation utilising a stuffer box and the operation which applies a false twist to the stuffer box is for in Chapter 7 of the publication Yam 1967 of the Monsanto of Congress Catalog Card stuffer box imparts a characteristic or to Procedures which apply or texture by false twisting are discussed in Chapter of the dyeing of filament yams is generally after the texturing operation has on some Most yarns are dyed in the form of muffs or These conventional dyeing procedures generally result in loss of texture in the dyed yarn to a greater or less degree ing on the type of texture and the processing It has now been discovered that a level dyed filament yarn of highly desirable texture can be provided an economical manner by combining in sequence a operation followed by and a subsequent texturing The filament yarn is preferably as a and in the knitted The tubing is then wound onto a dye package and dyed in accordance with conventional After the dyed tubing is and to a texturing such as a stuffer a false twist machine or other texturing The result is a level dyed textured yarn when knitted or woven into a fabric for use in home or industrial provides a fabric of improved texture and Undyed yarns of the same high quality are obtained by omitting the dyestuff or colorant from the dye bath ing the dyeing All other including the presence of moisture and the pressure and temperature ditions remain the The resulting undyed when knitted into finished give an outstanding bulk and an excellent finish and hand to the The first step of the process of this that of knitting and to form a is similar to the process known to the prior art with the important exception that the is plished at a temperature below that required for permanent filament is On the other the ture must be higher than temperature used for the particular yarn being treated so that the knit yarn will be stabilized against shrinking during the dyeing For the temperature used for dyeing ester yarns is in the order of The temperature to be used with such yarn must be in excess of such dyeing temperature and a temperature of about has been found to be As another nylon filament yarns are usually dyed at a temperature in the range of I have observed that excellent dyein results may be obtained when such nylon yarn in knitted form has been before dyeing at a temperature of about On the other the temperature for knitted yarn should be lower than the temperature which will be used in the final texturing step in order to secure improvement in stretch and texture of the finished dyed After as the knitted yarn may be dyed in a conventional It has been observed that the knitted tubing forms compact dye packages which are substantially shrinkage during dyeing and that level dyeing is readily The step of the present invention involves merely the unraveling of the dyed yarn The unraveled yarn is then fed to a texturing device such as a stuffer crimper or a false twist either directly or after being subjected to any desired repackaging or twisting or plying operation or operations as intermediate The texturing step is carried out in and at a temperature which imparts the desired permanent texturing to the dyed The temperature at which devices are operated is sufficiently high to substantially remove the crimp imparted the yarn during the of the knitted yarn tubing and to produce the permanent texturing crimp in the The following examples further illustrate the process of the present Example I denier polyester filament yarn is knitted on a continuous circular knittin machine having a 224 needle As the knitted tubing leaves the it is heat set at 3 The yarn tubing is then wound on a suitable core into a dye package and dyed following standard cedures at After the dyed tubing is and fed to a stuffer which is operated at a temperatur of This temperature is sufficiently high to stantially remove the crimp imparted by the first setting step described above before the permanent crimp imparted by the stuffer crimper becomes The resulting yarn is dyed level and when knitted into gives outstandingly high bulk and an excellent finish and hand to the Example II Example I was except that the dyestuff was omitted from the dye bath used in the dyeing All other conditions remained the The resulting when knitted into knitted gave outstanding Example III denier nylon filament yarn is knitted on a c tinuous circular knitting machine having a 0 As the knitted tubing leaves the machine it is a1 The yarn tubing is then wound into a dye package and dyed following standard procedures at After the dyed tubing is and fed to a stuffer which is operated at a temperatu of This temperature is sufficiently high to stantially remove the crimp imparted by the first setting step described above before the permanent crimp imparted by the stuffer crimper becomes The resulting yarn is dyed level and when knitted into gives outstandingly high bulk and an excellent finish and to the Example IV Example III was except that the was omitted from the dye bath used in the dyeing All other conditions remained the The resulting when knitted into finished gave outstanding and an excellent finish and hand to the finished Example V 100 denier polyester filament yarn is knitted on a continuous circular knitting machine having a 224 needle As the knitted tubing leaves the it is heat set at The yarn tubing is then wound on suitable core into a dye package and dyed following standard cedures at After the dyed tubing is and fed to a stuffer which is operated at a setting step described above before the permanent by the stuffer crimper becomes The resulting yarn is dyed level and knitted into finished goods gives outstandingly high bulk and an excellent finish and hand to the Example VI denier polyester filament yarn is knitted on a continuous circular knitting machine having a 224 needle As the knitted tubing leaves the it is set at The yarn tubing is then wound on a suitable core into a dye package and dyed following standard cedures at After the dyed tubing is and fed through a false Wist texturing machine with turns per inch at and a spindle speed of After false twisting the dyed filament yarns may autoclaved by standard procedures and be used as a yarn or used without as a Example VII 70 denier nylon filament yarn is knitted on a continuous circular knitting machine having a needle As the knitted tubing leaves the it is heat set at The yarn tubing is then wound on suitable core into a dye package and dyed following standard cedures at After drying the dyed tubing is and fed through a false twist texturing machine at a spindle speed of RPM with turns per inch at a ture of This temperature is sufficiently high to m im arted b the first After false the dyed textured filament yarns may be autoclaved by standard procedures and be used as a yarn or used without autoclaving as a insufficientOCRQuality

Claims (1)

Δ method of making a textured filament yarn of a synthetic polymer comprising the steps of knitting a filament of synthetic the knitted yarn at a temperature intermediate between temperatures and normal texturing temperatures for the subjecting the knitted yarn to dyeing deknitting the and the yarn in the course of texturing at a temperature above that used to set the knitted yarn A according to Claim wherein dyestuffe are not present during the step of subjecting the knitted yarn to dyeing A method according to Claim 1 or wherein the synthetic polymer yam is from the group consisting of pol cellulose copolymers of a polyaa e and a copolymers of two different of copolymers cf two different types of A method according to

1. Claim 1 wherein the knitted yarn is dyed while being subjected tc dyeing A method according to any of claims 1 to wherein the steps of knitting filament from a synthetic polymer is performed in a circular manner to form a knit A to claim after heating a dye is of is according 5 or v tae texturing is by A according to 5 ing is by a false twist A according to 6 to dyeing of the at dyeing below the A according to any of alias to comprising the stops knitting a raw sotting knit yarn a mild crimp dyeing tae knit dyed and texturing yarn by a metho including v c the imparted to tae nit yarn before of asking a textured yarn of synthetic substantially as hereinbefore described vita reference to A textured yarn of a synthetic polymer whenever produced by tiao process ing any of 1 to For the Applicants insufficientOCRQuality