JPS59179809A - Production of polyester slab yarn - Google Patents

Abstract

PURPOSE:Highly oriented undrawn polyester yarn is subjected to simultaneous drawing and heat treatment, then overfed downward more than the taking-up speed to effect shrinkage as resisting to its own weight and heat treatment, thus producing the titled yarn with good thick and thin effect. CONSTITUTION:As a highly oriented undrawn yarn with an optical birefringence of 15-80X10<-3> is drawn at a ratio over 1.1, and simultaneously water or an aqueous liquid is applied intermittently to the yarn in the drawing zone by means of gear-type rollers and the yarn is heat treated. Then, the resultant yarn is overfed downward, more than the taking-up speed, then heat treated, as the yarn is passed in the reverse direction to the yarn-falling direction, to effect shrinkage resisting to the yarn's own weight for relaxation, thus giving the objective polyester slab yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for manufacturing a polyester slab yarn which can be dyed more deeply in the longitudinal direction of the yarn than in other parts and has a bulky slab part and has an excellent thick and thin effect. It is related to.

Fabrics made from polyester yarn have an extremely important role in clothing because they have excellent characteristics such as foam and wear properties, wrinkle resistance, appropriate tension, and waist feel. However, in recent years, the demand for clothing has increased. With the diversification of
In response to the increasing trend in the market, various differentiated materials such as slub yarn have been proposed.

Conventionally, various attempts have been made to obtain polyester slab yarn ffi, which has a darkly dyed large diameter part (slab part) consisting of an undrawn part along the longitudinal direction of the yarn, a light dyed small diameter part, and gold. A method of mechanically stretching the yarn by changing the stretching ratio, a method of stretching the yarn at a stretching ratio lower than the natural stretching ratio, etc. have been proposed.

However, in the method of manufacturing the entire slug yarn simply by drawing conditions, it is difficult to fully adjust the length of the slab part and the frequency of appearance, resulting in a narrow pattern range.
When using undrawn yarn with a low degree of orientation as the supplied raw yarn, if the slab part becomes brittle during the false twist crimp process or dyeing process,
There are some drawbacks.

For this reason, the present inventors have addressed these issues and first
In Japanese Patent Application No. 57-206718, the birefringence is 15.
~80×10 highly oriented undrawn yarns are coated with naturally water-spreadable liquid K.
We have devised a complete method for producing slab yafke by subjecting it to 4 (J), IP!II treatment, and then (8) relaxation heat treatment with 8% or more 3-bar feed.

In this method, when water or an aqueous liquid is attached to the yarn and passed under small tension, that is, under supercharging, only 1'' of non-water is absorbed.
In some cases, the yarn passes through the entire heat treatment zone, but in the conventional method of supplying the yarn from the L side of the heat treatment sheet, the yarn supplied to the relaxation heat treatment zone becomes slack by the time it reaches the entrance of the heat treatment zone, and the yarn is not supplied as a relaxation heat treatment sheet. The yarn wound around the device η, making it impossible to operate, and there remained a problem that it would be impossible to maintain a sufficiently large excess supply rate.

The present invention was arrived at as a result of intensive studies to solve the above problems, and its purpose is to run the entire yarn, which has a mixture of wetted parts and non-wetted parts, under extremely small tension. To provide a method for producing T-polyester slab yarn with good operability and excellent thinning effect by making it possible to carry out relaxation heat treatment even under a wide excess supply exceeding 12%. This is a method for producing slab yarn in which water or an aqueous liquid is intermittently applied to the yarn and then heat treated, and then water or an aqueous liquid is applied intermittently to the yarn during the ignition treatment in (c).

In order to form a slab part that is sufficiently bulkier than other parts and can be dyed densely along the yarn with an appropriate length and appearance frequency, the aqueous liquid that is intermittently attached to the yarn is water'&- Substances other than mercury include surfactants, dyeing aids, and rust preventives, but they actually cause damage to dyeing properties, fiber damage, and even the human body. Any aqueous liquid may be used as long as it does not adversely affect the machine. In addition, any method may be used to attach water or an aqueous liquid to the yarn as long as the amount is applied intermittently over an appropriate length. For example, a method of attaching water or an aqueous liquid to the yarn using a gear type roller with protrusions on the roller surface may be used. , a method of contacting water or aqueous liquid attached to the roller surface at an arbitrary length by intermittent reciprocating motion of an electromagnetic lens, and the like.

In addition, heat treatment after applying water or aqueous liquid intermittently should be performed with such force that the effect of heat treatment does not reach the wetted areas or is extremely small, so that the heat treatment effect is sufficiently applied to non-watered areas. However, the heat treatment conditions include, for example, such that the wetted area is still in a wet state immediately after the heat treatment, and the heat treatment temperature is 200℃.
~250°C.

An example of the condition is that 1ffi w is 0.2 to 0.8 seconds during heat reception.

The heat treatment temperature is high enough that the yarn does not melt, and the drawing rate is increased to sharpen the internal structure difference between the wetted part and the non-watered part.The heat treatment method is non-contact heating. It is preferable to use 1/ for device sound.

Next, the yarn obtained in the manner described above, which has a mixture of wetted and non-wetted portions, is contracted against its own weight while being supplied downward in excess of the take-up speed. At least heat treat it. That is, in the method of the present invention, the yarn is supplied in excess of the take-up speed to the entire lower part of the yarn where wetted parts and non-watered parts are mixed, and is passed in the direction opposite to the falling direction of the yarn in the heat treatment zone. Because it is shrinked and heat treated,
Even if the excess supply temporarily exceeds the shrinkage amount of the yarn in the heat treatment zone, the supplied yarn will fall downward due to its own weight, and then the yarn that is received from the take-up direction will fall. It is pulled up by the heat shrinkage force, passes through the entire heat treatment zone, and is taken away. In Method 2 of the present invention, the yarn is thermally shrunk against its own weight, but even when using a heat treatment zone with a long heater length of 9 m, the tension on the take-off side is ]my/d. It is possible to create an extremely small take-up tension. In this way, in the method of the present invention, even if the contact resistance of the yarn on the heater surface or air resistance is added, the tension on the take-up side can be set to 5 mgt/d or less, and the shrinkage stress is extremely low. It is possible to sufficiently contract even 9 partial molecules, and the excess ψ supply rate is 12
Relaxation heat treatment exceeding % can be easily performed. In addition, the excessively supplied yarn is once supplied downward and then pulled up to the entrance of the heat treatment zone by the shrinkage stress from inside the heat treatment zone, so the yarn from the entrance to the exit of the heat treatment zone is always in a state of tension. This prevents the yarn from becoming loose at the entrance of the heat treatment zone and winding up around the feeding device, or from clogging the interior of the heat treatment zone. If the excess supply rate during the relaxation heat treatment is too low, the shrinkage of the wetted part will be insufficient and it will not be possible to form a slab part that is poor in bulk and deep dyeing properties, which is not preferable. Also, the larger the excess supply rate is, the more shrinkage is promoted in a free state, making the slab part more bulky and densely dyed. Therefore, it is desirable that the excess supply rate be within the range of 8% or more, preferably 12% or more.

''!, The heat treatment temperature during the fc relaxation heat treatment may be a temperature at which the wetted part fully shrinks under the set supercharge supply rate, but preferably the slab part is The bulkiness and deep dyeing property can be completely improved.Furthermore, in order to shrink the wetted part completely freely, it is preferable to perform the relaxation heat treatment without bringing the yarn into contact with a heat treatment device.

In the present invention, the steps up to the stretching heat treatment and the relaxation heat treatment step may be performed discontinuously or continuously.
A.

In this way, the wetted part is bulky and has a slab part that can be dyed deeply.
A slub yarn having a slub portion with excellent bulk and deep dyeing properties along the longitudinal direction of the yarn can be obtained.

Next, the present invention will be explained with reference to the drawings.

The diagram is a schematic process diagram showing one practical embodiment for carrying out the entire invention. Highly oriented polyester undrawn yarn spool (
]) The yarn (F) pulled out from the 10th roller (2) connects the 1st o-ler (2) and the 1a-ler < 2) J: The 20th roller (3) rotates at high speed. The entire thread swing width guide (5) is directly connected to the fulcrum (4) to which the swing motion of the electromagnetic solenoid 0υ is transmitted.
A rotary puller with a relatively small diameter for attaching water to the fulcrum guide (6), which serves as a fulcrum for swinging the thread, (8) is a water tank, (9)
is water or an aqueous liquid. Here, the thread (F) is guided to the fulcrum point (6) by the swinging action of an electromagnetic solenoid whose signal source is a random pulse oscillator. Shake between the fulcrum and the position (a) where it is in contact with the water (=J rotating roller (7)) to the position (b) furthest away from the water-applying rotating roller (7). At this time, the part where the yarn touches the water application rotating roller (7) becomes the water application part, and the part where it does not touch becomes the non-water application part.The length of the water application part and the non-water application part and the length of both The length ratio can be changed freely by using a microcomputer, film type 7-oto sensor, or other trunk pulse generation unit, and can be adjusted to any desired length along the longitudinal direction of the yarn. The yarn can be a mixture of wetted parts and non-watered parts.
6) All paths go into @l heater (10) and heat treatment is performed under stretching.

Next, the yarn (F) passes through the 20th roller (3), then rotates downward by the 30th roller (0), which rotates at a low speed. The second heater (1
The yarn enters υ and is contracted against its own weight to form the slab (S) shown in FIG. It will be done.

Polyester in the present invention is a polymer having an ester bond in one molecule chain, and includes pomopolymers typified by polyethylene terephthalate and copolymers thereof (including polyester polymers, etc.).

The method of the present invention is based on a series of birefringences ranging from 75 to 15).
10 When carrying out this process, the water or aqueous liquid is attached to the yarn and subjected to the stretching heat treatment, and the heat treatment is performed by supplying the yarn in excess of the take-up speed and shrinking it against the yarn's own weight. Even under relaxation heat treatment conditions where the excess supply rate exceeds 12%, the threads in the heat treatment zone are always in a state of tension. As a result, the polyester slab yarn with high bulkiness and deep dyeing properties can be easily processed without oversupplied yarns loosening at the entrance of the heat treatment zone and wrapping around the feeding device, or clogging the inside of the heat treatment zone. Can be manufactured well.

Hereinafter, the method of the present invention will be explained in detail with reference to all Examples.

Example Highly oriented polyester undrawn yarn 230 with a birefringence index of 45 x 10-3 obtained by spinning polyethylene terephthalate at full speed
d/48f (natural stretching ratio 1.533) was supplied to the 10th roller in the process shown in FIG. While stretching at a stretching ratio of 1.710), a microcomputer and a random pulse generation unit were used together for a water application time of Q, Q4 sec.

Water and gold are deposited intermittently by repeating the non-watering time of 1 sec.
1st heater (non-contact heater with lid, heater length 0.
6m) at a temperature of 250°C, the entire 20th lane was fed to the 20th lane @20th lane and the 30th lane with a surface speed of 68.8 m/min. 16
．． 2nd heater (contact heater with lid, heater length 069m) while supplying at 3% and then raising it to Niga
A slub yarn according to the method of the present invention was prepared by a relaxation heat treatment at a temperature of 220°C.

During the above processing, just before the wet part enters the second heater, the yarn fed from the 20th roller becomes loose and reaches -F.
Immediately after the wet part enters the second heater, the slack decreases, and the sheet falls downward and returns to its original state with almost no slack.ii' + “J” -
He was pulled up towards the 20th Ra and wrapped around J.
Continuous and stable operation was possible without clogging in the second heater. The fineness of the slab yarn was approximately twice that of the other parts, and the thick/fine ratio was higher than the draw ratio.
The tube-knitted fabric is knitted with a tube-knitted fabric, and the tube-knitted fabric is completely dispersed dye (Lesol).
The fabric obtained by normal pressure dyeing with 1neBlue GRL 1% o, wf,) was markedly dyed in the slab part,
It had excellent deep dyeing properties. On the other hand, for comparison, L
Using the same highly oriented undrawn polyester yarn as described above, in the process shown in FIG. The second heater (1
When the yarn was passed through from above υ and the entire relaxation heat treatment was performed, the yarn became wrapped around the 20th roller (3), making it impossible to process, resulting in an excess supply failure of 12% or more, and the relaxation heat treatment could not be performed. Ta. (Note that the numbers in Figure 3 are the same as in Figure 1.)

[Brief explanation of drawings]

Fig. 1 is a schematic process diagram showing one embodiment of the method of the present invention, Fig. 2 is a schematic side view showing an example of a polyester slab yarn obtained by the method of the present invention, and Fig. 3 is an example of a conventional method for producing a slab yarn. FIG. (1)・Highly oriented polyester unstretched Sgur, (2)
...10th-Ra, (3)...20th-Ra, (4
)...Fully point, (5)... Thread swing 1-IJ
guide. (6)...Fully point guide, (7)...Rotating roller, (8)...Water tank, (9)...Water or aqueous liquid, (10-first heater, 01)...
2nd heater, α... 30th-ra, 03...
・A-removal roller, (tied, package, CF)・
... Thread. Patent applicant Unitika Co., Ltd.

Claims (1)

[Claims] A highly oriented undrawn polyester yarn having a birefringence of 15 to 80 x 10'' is stretched by 1° or more, and heat-treated by intermittently attaching water or an aqueous liquid to the yarn during the stretching process; Next, when performing the relaxation heat treatment, the entire yarn that has been subjected to the drawing heat treatment with the water or aqueous liquid applied thereto intermittently is contracted against its own weight while being supplied downward in excess of the take-up speed. The manufacturing method of polyester slab yarn, which is fully characterized by heat treatment.