JPH064932B2 - Polyester yarn sizing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for sizing polyester yarn.

2. Description of the Related Art When a woven fabric made of synthetic fibers such as polyester and polyamide is manufactured, it is sewn by a sizing machine as shown in FIG. 1 and woven by a normal loom WJL. In this sizing machine, a large number of raw yarns set on a creel 1 are passed through a reed 2 to be gathered in equal pitches, and glue is applied by a glue bath 3. The squeeze roll 4 is used to squeeze the thread after the gluing of the squeeze roll to obtain the required gluing amount. The yarn is dried by the first drying chamber 5, the second drying chamber 6 and the drying cylinder 7 and wound on the beam 8. The main stretch S% in sizing represents the speed ratio between the squeeze roll 4 and the drying cylinder 7. That is, when the speed of the squeeze roll 4 is 1.07, the speed of the drying cylinder is 0.97, and the speed of the drying cylinder is 1.003.

The present invention uses a sizing main stretch S% in producing a woven fabric using a yarn spun at a high speed of 6000 m / min or more from 3 times to 5 times the maximum value Fmax of dry heat shrinkage stress of the yarn. The present invention relates to a sizing method performed in a double range.

Fmax uses a thermal stress measuring machine to fix the yarn with a gripping length of 50 cm,
The exothermic stress Fmax at the extremal temperature Tmax is obtained by heating at a temperature rising rate of 10 ° C./min and drawing a heat shrinkage stress curve as shown in FIG.

Problems to be Solved by the Invention In recent years, the practical application of high-speed spinning technology (spinning speed of 6000 m / min or more) has attracted attention as an innovative technology for manufacturing polyester yarn. However, high-speed spinning yarns that do not undergo the drawing process still have characteristics different from conventional yarns, and therefore, applying the same woven fabric manufacturing conditions as conventional yarns causes problems in process performance and product quality. It often occurs and has not been industrially put into practical use.

If high-speed spinning is performed under the same conditions as conventional sizing conditions, roller winding or yarn breakage of the yarn is likely to occur during sizing, and as a result, the operating rate of the loom during weaving can be improved. There is a problem that the deterioration of the quality of the woven fabric and the deterioration of the quality of the woven fabric are caused.

Means for Solving Problems The present invention aims to solve such problems, and as a result of various examinations of yarn sizing conditions by high-speed spinning,
Based on Fmax, which is one of the characteristics different from conventional yarns,
Main stress S% during drying after sizing is 3Fmax
The present invention relates to a sizing method performed by setting a range of ≤S≤5Fmax.

In the present invention, the maximum value Fmax of dry heat shrinkage stress is 0.2 to 0.4.
g / d Polyester yarn main stretch S% 3Fma
A sizing method of drying at a stretch rate of x to 5 Fmax%, for example, a yarn spun by high-speed spinning at 6000 m / min or more is F
A maximum of 0.2 to 0.4 g / d is obtained. On the other hand, since the conventional polyester yarn has Fmax of 0.6 to 0.8 g / d, the stretch S% is out of this range, and the stretch rate is 2% or more.

The number of twists of the yarn is 0T /
It is M. However, there is a method of imparting 5 to 10 / m of entanglement by an air jet in order to improve the process performance, and such a yarn is preferable in terms of fabric production. But 1
When a yarn having an entanglement of 0 / m or more is sized, the entanglement point is fixed and the quality of the fabric is deteriorated, which is not preferable.

Action Conventionally, among the sizing conditions of polyester yarns, the main stretch S% is empirically 2% or more, for example 50d / 2.
When sizing a 4f warp, it is performed at about 2.4%. The sizing of the polyester yarn is carried out in the vicinity of the above-mentioned conditions, except for the case of sizing the processed yarn or the special yarn whose properties of the yarn greatly differ. On the other hand, 6000m / mi
If yarns with different characteristics such as yarns produced by high-speed spinning of n or more are performed under the same conditions as conventional yarns, that is, main stretch S% is around -2.4%, yarn breakage due to roller winding or single yarn winding occurs. It is likely that the yarns will be run out, the running yarns will be squeezed, and the arrangement will be disturbed, resulting in reduced efficiency and poor quality.

The present invention has investigated various sizing conditions in order to solve these problems of sizing by high-speed spinning. It has been found that good results can be obtained by using Eid. If the overfeed is 5 times or more, the above-mentioned trouble occurs, and if it is 3 times or less, over tension drying occurs and the warp quality of the woven fabric deteriorates. In particular, since the yarn spun by high-speed spinning is a completely untwisted yarn having no original twist, a single yarn breakage winding problem is likely to occur, and it is effective in the area of the present invention. Of course, even a yarn having entanglement due to air pressure for improving process performance does not hinder the effect.

Further, the preferred range of sizing in the present invention is a chamber drying temperature of 120 ° C to 130 ° C and a cylinder drying temperature of 95 ° C.
˜110 ° C., sizing tension (tension between the second drying chamber and the drying cylinder) 0.20 to 0.25 g / d, and a glue adhesion rate of 3 to 4%.

Example Polyester 50d with a spinning speed of 7000 m / min and 8000 m / min
/ 24f, weft is polyester taffeta with 75d / 36f yarn, and warp sizing stretch S%
Correspondence between conditions, sizing properties, weavability in WJL, and fabric quality was evaluated.

50/75 ester taffeta, which was spun at a spinning speed of 7000 m / min and 8000 m / min, had a maximum dry heat shrinkage stress Fmax of 0.23 g / d and 0.29 g / d, respectively, and was sized under various stretch conditions. Weaved as warp. The results are shown in Table 3 in comparison with the case of sizing the conventional yarn. Main sizing conditions other than sizing stretch conditions are shown in Table 1.
The weaving conditions are shown in Table 2.

The setting of the sizing stretch S% in the sizing machine cannot be set arbitrarily, and since it is a general sizing machine that is set to an integer multiple of 0.3%, as shown in Table 3, -0.3 Tests were conducted within the range of -2.1%. The weaving quality after weaving was evaluated according to the following criteria.

Quality evaluation A: Passed anti-class B: Semi-passed anti-class C: Semi-downgraded anti-class D: Downgraded anti-class S Experiments Nos. 1, 2 and 7 in which S% was 3Fmax or less were stable without sizing during running Although it was in a running state, the warp quality of the weaving machine woven under the weaving conditions shown in Table 2 was a grade of degrading anti-class because of a remarkable cracking defect in the ground. This is a cause of over-tension drying due to lack of sizing overfeed. The experiments with S% of 5 Fmax or more are Nos. 5, 6, and 11.

In Nos. 5 and 11, due to excessive sizing overfeed, the sizing tension was low and roller winding, running yarn picking, etc. were likely to occur, and yarn breakage occurred 1 to 3 times per 10 ⁶ m of sizing running yarn. . WJ of this sizing thread
Regarding the weaving property by L, the number of times of warp cause stop per day per loom was 1.8 to 2.4 times / day. The weaving property was poor at the stand, and the quality of the weaving machine hit and streaks occurred. .

In No. 6, since the overfeed was excessive, the sizing tension was not applied, and the yarn was wound around the squeeze roll 4 and the sizing running was impossible.

On the other hand, in Experiment Nos. 3, 4 and Nos. 8, 9, and 10, proper sizing tension was applied, and there was no sizing yarn breakage.

The weavability by WJL is that the number of warp factor stop is 0.1 to 0.2.
The fabric was in a good weaving condition with 1 turn / day / base, and was of good quality with no defects such as cracks in the ground and hitting lines.

In particular, Experiment Nos. 3 and 9 were excellent in sizing runnability, WJL weavability, and quality of raw fabric, and were the best among the present examples.

EFFECT OF THE INVENTION In sizing of polyester yarn spun at a high speed of 6000 m / min or more, the main stretch S% is set to 3Fmax ≦
By drying with an overfeed in the range of S ≦ 5Fmax, good results can be obtained in sizing running property, weaving property, fabric quality and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an example of a commonly used sizing machine for polyester yarns. FIG. 2 shows a heat shrinkage stress curve. 1 ... creel, 2 ... reed, 3 ... paste bath, 4 ... squeeze roll, 5 ... first drying chamber, 6 ... second drying chamber, 7 ... drying cylinder, 8 ... winding beam.

Claims (2)

[Claims] 1. A polyester yarn having a maximum dry heat shrinkage stress Fmax of 0.2 to 0.4 g / d, which is spun at a high speed of 6000 m / min or more, is sized and used as a warp to produce a woven fabric. At this time, the polyester yarn is sized by overfeeding the yarn from the squeeze roll to the drying cylinder so that the stretch S% between the squeeze roll and the drying cylinder is maintained in the range of 3Fmax ≦ S ≦ 5Fmax. Method. 2. The sizing method according to claim 1, wherein a yarn having a twist number of warp of 0 T / M and a degree of entanglement by air jet of 5 to 10 / m is used.