JPS59125904A - Manufacture of polyester multifilament for separation - Google Patents

Abstract

PURPOSE:To obtain the titled filament yarn free from the entanglement and breakage of single filament, and having excellent separation workability, by drawing and heat-setting a polyester filament yarn directly after spinning without winding, sliding with a sliding guide keeping the ratio of the tension at the inlet side to that of the outlet side at or above a specific level, and winding the treated filament yarn. CONSTITUTION:Polyester is melted and spun through the spinneret 1 and solidified by cooling. The obtained filament yarn is oiled by contacting with the oiling roller 2 and the yarn guides 3, 4, and separated into the filament groups Y1-Y4 by the separation guide 5. Each filament group 5 is taken up directly with a hot take-up roller 9 without winding, and at the same time, preheated at a specific temperature and drawn between the take-up roller 9 and the drawing and heat-setting roller 10. The drawn and heat-set multifilament is passed over a sliding guide 7 keeping the ratio of the tension at the inlet side to that of the outlet side to >=1.1, and wound round the winding bobbin 12 to obtain the objective filament yarn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a polyester multifilament for splitting that has good splitting properties.

Conventionally, the method of splitting multifilaments to produce monofilaments has been widely adopted, but in order to produce multifilaments for splitting, in order to improve the splitting properties, it is necessary to avoid twisting the multifilaments. It is necessary to pay close attention. The method for producing this untwisted multifilament for splitting is to first wind up an untwisted, undrawn multifilament into a cheese-like package in the spinning process, and then, while rotating the cheese-like package, undrawn multifilament. Circumferential direction K of the package.

A method is usually adopted in which the material is pulled out without being untwisted, stretched or false-twisted, and then rolled into a cheese-like package without twisting. However, in such conventional methods, no matter how much KM care is taken, when undrawn multifilament is unrolled from the package,
It is not possible to prevent slight twisting or entanglement between single yarns, which causes yarn breakage during fiber splitting, and the vine 4-
There was a problem in that it inhibited improvement in the fibrillation properties of the filament.

In order to solve the problems of the conventional method, the present inventors investigated a method of winding the spun undrawn multifilament without first winding it (directly drawing it and heating it). According to this method, unlike the conventional method, the unstretched multifilament is not wound into a package and then unwound from the package and subjected to stretching, so that the multifilament is not twisted during unwinding. However, when the present inventors investigated this method, they unexpectedly found that the splitability of the multifilament obtained was The fiber splitting machine was extremely bad and the fibers broke frequently, making it impossible to perform satisfactory fiber splitting.

The present inventors investigated the cause of such deterioration in splitting properties and found that the main causes were slight fusion of single yarns and entanglement between single yarns.

Furthermore, the cause of these fusions and entanglements is that because the multifilament runs on the roller at high speed, lq-dependent movement (single yarn migration) occurs without movement of the single yarn on the roller. Stretch the eye on the heat set roller,
Because the yarn is heat-set at a high temperature, uneven spinning wheels of single yarns caused by inter-yarn threads or single yarn my-f unions are heat-set at high temperatures, resulting in entanglement between single yarns. was investigated.

As a result of intensive studies to solve these problems, the inventors of the present invention were able to eliminate the entanglement and fusion between single filaments by squeezing the multifilament after drawing and heat setting with a guide and pressing a button. It was discovered that a multifilament with good splitting properties could be produced, and the present invention was completed.

That is, in the present invention, after spinning polyester, the polyester multifilament is directly drawn and heat-set without being wound up to produce a polyester multifilament for splitting without heating or winding. A polyester multifilament for fiber splitting, which is rubbed and wound by a rubbing guide so that the multifilament tension on the exit side is 1.1 times or more as compared to the multifilament tension on the input side of the saw. It is a manufacturing method.

Polyester as used in the present invention mainly refers to polyethylene terephthalate, including copolyester containing 85 mol% or more (preferably 95 mol% or more) of ethylene terephthalate units, polybutylene terephthalate, polyethylene-2,6-septalate Other polyesters such as These polyesters contain known additives, such as matting agents, colorants, and flame retardants.

It may contain stabilizers, etc. These polyesters have an intrinsic viscosity [η] (measured in a 0-chlorophenol solution at 35°C) of 0.3 to 1. o1 especially 0.5-0.8
Preferably.

Moreover, the polyester multifilament for use in the present invention is a multifilament with a number of single yarns of 10 to 20 and a single yarn denier of about 10 to 30 deniers.

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of a spinning direct drawing apparatus for carrying out the method of the present invention. The multifilament melt-spun from the spinneret (1) and cooled and solidified is passed through an oiling roller (21 hair yarn guide + 31, (41K)
After being brought into contact and oiled, the four yarn bundle groups (Yi) and (Yt) are separated from the dividing yarn guide (5) K.
, (Y3) , (Y4) (Each yarn bundle consists of three single yarns (
The monofilament) is divided into K parts, each of which is taken off by a heated take-off roller (9), and
It is preheated to a predetermined temperature and stretched several times between the stretching and heating set rollers H. At this time, divide the thread guide (61, (81)
may not be used if the state in which the yarn is divided into four by the dividing guide 15) can be maintained on the drawing heat center roller a1. If a base shape occurs on a part of the drawing heat setting roller due to yarn fluctuation, turn pitch, etc., use the thread dividing guide (6).
and/or a split thread guide (8) is required. Four groups of yarn bundles (Y,) that have been drawn and heat set.

(η), (1, (Y4)) is rubbed by the rubbing guide (7), then focused by the focusing guide (11), and is rapidly wound on the winding bobbin.

In the method of the present invention, splitting yarn bundles consisting of at least 2 to 6 single yarns (monofilaments) and running them on the drawing heat setting roller can reduce migration and entanglement between single yarns. Yes, it is preferable. It is ideal to separate single yarns one by one and run them in order to prevent yarn migration and fusion.
Both require long rollers, and it is not industrially advisable to rotate such a large roller at high speed. In the above example, an example of single production was given to illustrate the principle, but of course tandem or double tandem production is carried out industrially, and in that case, the roller becomes even longer. Split thread guide (53, +61, (8
There are no particular restrictions on the shape and material of 1, and guides and rollers commonly used for yarn processing are sufficient.

In the method of the present invention, the polyester multifilament after drawing and heat setting is rubbed by a rubbing guide (7) K to eliminate light fusion and entanglement between single filaments that occur on a portion of the drawn heat cera) a-ra.

When the polyester multifilament is rubbed in the method of the present invention, the tension of the multifilament on the exit side of the rubbing guide (7) is 1.1 times or more, preferably 1.15 times. It is necessary to rub the area more preferably 1.2 times or more. If this tension ratio is too low, it will not be possible to obtain the effect of improving the fiber splitting property by increasing the substantial abrasion effect.

On the other hand, although there is no particular upper limit to the tension ratio, there is a limit to the drawing speed depending on the process condition, winding shape, etc.

Although it varies depending on the brand, etc., approximately 1.6 times or less, preferably 1.5 times or less is adopted.

The shape of the rubbing guide (7) is preferably one shown in FIGS. 2 to 4, but is not limited to these shapes and can spread the multifilament over a wide range of shapes. Any shape of the guide can be used.

Further, the material for the abrasion guide is a guide material generally used for the yarn treatment 31, such as ceramics such as alumina or titanium, metal treated with plasma coating, nodule chrome plating, or carbide treatment.

Further, in the method of the present invention, it is preferable that the rubbing of the poly 2° stell multifilament by the rubbing guide (7) be carried out at a temperature of 70° C. or higher. Setting the rubbing temperature to 70°C or higher improves the splitting properties of the multifilament, and also improves the spinning oil and
The generation of scum made of polyester oligomers, etc. is suppressed, and yarn breakage during the manufacturing process is also reduced. In order to maintain the rubbing temperature at 70°C or higher, the rubbing guide (7) itself may be heated to 70°C or higher, or the multifilament sent out from the drawing heat set roller On may be cooled to below 70°C. Before this occurs, a rubbing guide (7) may be provided at a position where the temperature of the multifilament is still 70° C. or higher.

As detailed above, according to the method of the present invention, polyester multifilament is wound without heating by direct spinning and stretching, and the multifilament after drawing and heat setting is rubbed by a rubbing guide. Since the entanglement and melt layer between single filaments are eliminated, the splitting properties of the multifiber mesotho can be significantly improved.

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

Examples 1-4. Comparative Example 1.2 Polyethylene terephthalate having an intrinsic viscosity of 0.064 as measured in an 0-chlorophenol solution at 35° C. was melt-spun using the apparatus shown in FIG. 1 and subsequently directly stretched without winding. did.

At this time, the spun multifilament was divided into four yarn bundles W (number of monofilaments per yarn east: 3) on a heating take-off roller (9) and a drawing heat setting roller CLl. The peripheral speed (spinning speed) of the heated take-off roller (9) is 760
@/min, temperature is 100°C, peripheral speed of stretching heat set roller α value (stretching speed) is 3.200111 min, temperature is 1
The temperature was 40°C. The yarn bundles sent out from the drawing heat set roller α1 were rubbed by a rubbing guide as shown in the following table (with various tension ratios), and after doubling, they were wound up.The yarn temperature at the time of rubbing was 95. ℃.The obtained drawn yarn had a temperature of 24℃.
It was 0 denier/12 filament. This drawn yarn was passed through a fiber splitting machine, and the number of yarn breakages during fiber splitting was determined to evaluate the splitting property. The results are shown in the table below.

When the scratching guide was not used (Comparative Example 1)
) and rubbing with a rubbing guide, but if the multifilament tension ('rt) on the exit side is less than 1.1 times the multifilament tension ('rt) ic on the input side (
In Comparative Example 2), there were many yarn breaks during fiber splitting (fiber splitting properties were poor. However, due to the abrasion guide, the multifilament tension on the exit side was more than 1.1 times the multifilament tension on the input side. In the case of the present invention, which was rubbed as follows (Examples 5 to 4)
had good splitting properties with less yarn breakage during splitting.

Examples 5 to 7 In Example 3, a test was conducted in which the position of the rubbing guide was variously changed to change the yarn temperature during rubbing. The results are shown in the table below, and the higher the temperature during rubbing, the more
When c70'C or higher, there is no yarn breakage during drawing, the number of yarn breakages during fiber splitting is also reduced, and fiber splitting properties are improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of an apparatus for carrying out the method of the present invention, and FIGS. 2 to 4 are perspective views showing examples of a friction guide used in the method of the present invention. (1)-・・・Base (Yl), Crt)
, (Y,) , (Yl)... Yarn bundle (7)
...Abrasion guide (9)...Heating take-up roller 5-Ql...Stretching heat set roller Q3...
... Winding bobbin patent applicant Teijin Ltd. Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] L After polyester spinning, when producing polyester multifilament for splitting by directly stretching and heat setting without winding and winding without heating, the polyester multifilament after stretching and heat setting is Manufacture of polyester multifilament for fiber separation, characterized in that the multifilament tension on the input side is rubbed and wound by a rubbing guide so that the multifilament tension on the exit side is 1.1 times or more higher than the multifilament tension on the input side. Law. 2. The method according to claim 1, in which the yarn bundles are divided into groups of 2 or more monofilaments and 6 or less monofilaments and heat set. 3. The method according to claim 1 or 2, wherein the rubbing with the λ rubbing guide is performed at a wax level of 70° C. or higher.