JPH073635A - Polyester tow for stretch-breaking spinning - Google Patents

Abstract

PURPOSE:To obtain a polyester tow for stretch-breaking spinning capable of eliminating production trouble such as collective breakage in stretch-breaking or wrapping around rollers and improving the productivity. CONSTITUTION:This polyester tow for stretch-breaking spinning has <=55% breaking elongation of single fiber and contains inorganic fine particles sticking through a surfactant to the surface layer of the single fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester tow for sawing and spinning. More specifically, the present invention relates to a polyester tow having a good tenacity and an excellent feel like animal hair fiber and a blended spinning. The present invention also relates to a polyester tow for sawing and spinning, which provides a fabric having the mechanical properties of polyester fibers while taking advantage of the texture of animal hair fibers.

[0002]

BACKGROUND OF THE INVENTION Wool is the most popular animal fiber among natural fibers, and it is widely used not only as a material for autumn and winter such as coats, suits and sweaters, but also as a material for thin spring and summer. ing. High-quality animal hair fiber materials such as cashmere and vicuna have a fineness (2.5d or less) and a relatively long fiber length (50 to 130).
Therefore, it is possible to provide a woven and knitted fabric which is supple and warm, which cannot be expressed by a usual wool material. However, the spun yarn spun with only these natural fibers has a relatively low tenacity in the material itself, so that the durability is poor and the after-care may be difficult. Further, when it is attempted to obtain a spun yarn of relatively fine count, it is necessary to use animal hair raw material having a fineness and a long fiber length, and there is a problem that these are expensive.

Polyester fibers have been proposed and used as a blending partner of animal hair fibers in terms of price, strength backup, and textured surface such as tension and waist. However, polyester staples with a fineness and a relatively long fiber length have a significantly poor spinning property, and particularly in the card process, a decrease in productivity due to cylinder wrapping and a decrease in sliver quality due to the occurrence of nep are major problems, and satisfactory spinning is achieved. I haven't got the thread. On the other hand, as a spinning method aimed at improving the spinnability of fine fiber, there is a tentered spinning, which is widely used to obtain bulky spun yarn or high-strength spun yarn after making a sliver directly while towing the tow. ing. Since this method can easily obtain a sliver having a relatively fineness and a long fiber length, it is used for acrylic fibers and the like. Polyester fibers can be produced almost stably in polymers using 0.2% or more of titanium oxide, but the production capacity is still only about 50% of that of acrylic fibers. Furthermore, it was difficult to stably produce fine-fine varieties using super bright polymers that do not contain titanium oxide.

Focusing on the surface condition of the fiber as its reason, and pursuing the cause, the super bright fiber containing no titanium oxide has a smoother surface than the fiber containing titanium oxide. As the frictional resistance increases, the fibers that make up the tow have poor separation properties,
There is a tendency for troubles such as group breakage during static cutting or static electricity generation to occur easily. It has been found that it is difficult to eliminate production problems such as roller winding at the same time. Of course, it is possible to improve the above problems by adding baby powder, French choke, etc. at the time of cutting, but the workability deteriorates, and it cannot be used for normal production.

[0005]

The problem to be solved by the present invention is to solve the production troubles such as collective cutting at the time of saw cutting of polyester tow for saw cutting, roller winding, etc., which could not be achieved by the above-mentioned prior art, and to improve the production capacity. To improve.

[0006]

The present invention includes: A polyester tow for sawing and spinning, characterized in that the breaking elongation of the single fiber is 55% or less, and the inorganic fine particles are attached to the surface layer of the single fiber via a surfactant. 2. 2. The polyester tow for sawing and spinning according to the above 1, characterized in that the inorganic fine particles have an average diameter of 1 mμ to 200 mμ. 3. 2. The polyester tow for sawing and spinning according to the above 1, wherein the inorganic fine particles have an average diameter of silica. 4. The polyester tow for sawing and spinning according to the above 1, wherein the fineness of the single fiber is 2.5 denier or less. By doing so, the purpose is achieved.

The details will be described below. In the present invention, the tow is composed of fibers containing a polyester polymer as a main component. In addition, the total fineness of the tow is 100,000 to 100 from the viewpoint of operability, productivity, ability of the breaking device, packing form, and the like.
10,000 denier is preferable, and 300,000 to 600,000 denier is more preferable. Furthermore, the average strength of the single fibers forming the tow is 2.3 to 9 from the viewpoint of making the pill property excellent.
g / d is preferred. The cross-sectional shape of the single fiber may be a round cross section, a polygonal cross section such as a triangular cross section or a square cross section, a flat cross section, or a hollow cross section. Further, it may be a composite fiber of different polymers, and the composite form may be a core-sheath structure, a side-by-side structure, a split structure, or a sea-island structure.

The average value of the breaking elongation of the single fibers forming the tow is set to 55% or less. If the average value of the cutting elongation of the single fiber exceeds 55%, the breaking property becomes poor and the object of the present invention cannot be achieved. Further, in the present invention, the monofilament constituting the tow has inorganic fine particles attached to the surface layer via a surfactant. Here, examples of the inorganic fine particles include metal oxides such as titanium oxide, aluminum oxide and zinc oxide, and fine particles such as magnesium carbonate, calcium carbonate, silica, talc, zirconia and silicon nitride, with silica being preferred.

The average diameter of the inorganic fine particles is preferably 1 to 200 mμ, more preferably 5 to 50 mμ. If less than 1 mμ,
The effect of lowering the frictional resistance due to addition of particles tends to be diminished, and if it exceeds 200 mμ, the possibility of damaging the constituent single fibers is likely to occur. Furthermore, the drawback that the added fine particles are likely to fall off is likely to become apparent. The shape of the inorganic fine particles is not particularly limited, such as a substantially spherical shape, a needle shape, or a plate shape, but a substantially spherical fine particle is preferable from the viewpoint of the frictional resistance reduction effect, the difficulty of scratching the surface of the constituent single fiber, and the like.
Further, when the inorganic fine particles are attached to the fiber surface via the surfactant, it is preferable that they are uniformly attached without aggregating as much as possible, but even if they aggregate, there is no particular problem in the present invention. .

With respect to the surface active agent, it imparts appropriate sliminess and prevents generation of static electricity at the time of cutting, and it is possible to wind the roller together with the inorganic fine particles adhered to the surface of the single fiber through the surface active agent. It can be used as long as it does not cause troubles during breaking. The amount of the surfactant attached to the tow is preferably 0.1% by weight to 3.0% by weight. If the amount is less than 0.1% by weight, the effect of improving the breaking property may be insufficient, and the amount may be 3.0% by weight.
When it exceeds the above range, the surfactant may easily fall off to the roller during breaking, which may cause a trouble such as winding.

Next, an example of a method for producing the tow of the present invention will be described. Using a polymer composed of polyethylene terephthalate that is usually used as a polymer,
Using an appropriate spinning machine, the material is discharged through a spinneret to be fibrous. The discharged fibrous material is taken up by a capstan roller, accommodated in a can, and then the tows are drawn and stretched. When aligning tows, the total fineness after stretching is 10
Align to make denier 10,000 to 1 million. As the stretching method, a commonly used stretching method can be used. The tow according to the present invention has a cutting elongation of single fiber of 55% or less. As one of the methods for obtaining a tow having such physical properties, heat treatment is performed while limiting shrinkage on a hot plate or a heating drum. There is a way to do it. The heat treatment temperature is preferably about 100 ° C to 230 ° C, and some stretching or relaxation may be performed during this heat treatment. After the heat treatment, crimps are applied by a crimp applying device, and if necessary, further dried at a temperature of about 50 ° C. to 150 ° C. to produce a tow having a single fiber cutting elongation of 55% or less.

The tow according to the present invention is provided with the inorganic fine particles and the surfactant, but they can be provided individually or in a mixed state. As a method of applying the inorganic fine particles and the surfactant to the tow alone or in a mixed state, it is common to apply the method by a dipping method or a spraying method. The time of application may be any of before drawing, after drawing, after heat treatment for constant length, after applying crimp, after drying, etc., and application is carried out at one place or a plurality of places in these steps. Examples will be described below.

[0013]

Example 1 A non-stretched yarn obtained by discharging superbright polyester polymer containing no titanium oxide into a fibrous state from a die heated to 285 ° C. and drawing it at 1130 m / min to have a final total fineness of 500,000 denier. Aligned to become. This unstretched yarn tow was passed through an oil bath and stretched 3.6 times in a heated liquid. Then, it heat-processed on the heating drum of 170 degreeC, and crimped | crimped with the press type crimping | crimping apparatus. After the crimping, a mixture of 1.3% by weight of surfactant and 0.5% by weight of silica having an average particle size of 10 to 20 mμ was applied by a spraying method using a spray,
It was dried with a hot air dryer at 90 ° C to obtain the tow of the present invention.

The tow thus obtained was evaluated for its cutting ability using a tow reactor manufactured by OEM Seisakusho. The region where the tow is cut is a multi-stage stretching type with 6 stages, and the stretching is gradually performed so that the cutting can be smoothly performed in advance in the region.
It was then cut into pieces, and the total draw ratio including stretching and breaking was 6.9 times. As a result of the evaluation, at the tow reactor speed of 100 m / min, the cutting performance was good, and the cutting could be carried out without troubles such as static electricity generation or collective breakage.
The conditions and the evaluation results are shown in Table 1.

Comparative Example 1 The same polymer as in Example 1 was used, and spinning, drawing, heat treatment and crimping were carried out under the same equipment and conditions. In applying the surfactant by the spraying method, the same treatment as in Example 1 was carried out under the other conditions without adding silica. The obtained tow was evaluated with the same apparatus and conditions as in Example 1, and as a result, frequent outbreaks of clusters occurred, the tow reactor magnification was changed and the speed was reduced (100 m / min to 80 m / min), but stable production was difficult. The conditions and evaluation results are also shown in Table 1.

[0016]

Example 2 A device similar to that of Example 1 using a semi-dal polyester polymer containing 0.4% of titanium oxide,
Depending on the conditions, spinning, drawing, heat treatment, crimping, and spraying the mixed solution were performed to obtain a tow. The obtained tow was evaluated for breaking using the same tow reactor as used in Example 1. The total stretching ratio including stretching and breaking was 6.4 times. As a result of evaluation, the tow reactor speed is 100 m /
In minutes, the cutting performance was good, and there was no trouble such as static electricity generation or group breakage. Further, as a result of lowering the draw ratio in order to improve the productivity, the total draw ratio of 6.4 could be cut without problems. Furthermore, in order to confirm the productivity of acrylic tow, tow reactor speed 100m / min 5
It was confirmed that it was possible to cut even with a double hanging of 0,000 denier tow, although it was a short time. The conditions and evaluation results are shown in Table 2.

Comparative Example 2 The same polymer as in Example 2 was used, and spinning, drawing, heat treatment, and crimping were performed using the same equipment and conditions. When applying the surfactant by the spraying method, the same treatment as in Example 2 was performed except that silica was not added. The obtained tow was evaluated using the same apparatus and conditions as in Example 2. As a result, a slight waviness phenomenon was observed in the breaking zone, and uneven thickness of the sliver appeared. Furthermore, a group outage occurred. The conditions and the evaluation results are also shown in Table 2.

[0018]

EFFECTS OF THE INVENTION According to the present invention, the toughness of the polyester tow for fine-fine-strength spinning using the super bright polymer containing no titanium oxide, which has been difficult to achieve in the past, is improved, and it is possible to prevent the group towage and the winding of rollers due to static electricity generation. It has become possible to provide polyester tow for towing and spinning that is less likely to cause problems. In addition, regarding polyester tow containing titanium oxide, it has become possible to provide a polyester tow for saw cutting, which can achieve the same productivity improvement as that of an acrylic tow.

[0019]

[Table 1]

[0020]

[Table 2]

Claims (4)

[Claims] 1. The cutting elongation of monofilament is 55% or less,
A polyester tow for sawing and spinning, characterized in that inorganic fine particles are attached to the surface layer of the single fiber via a surfactant. 2. The average particle diameter of the inorganic fine particles is 1 mμ to 200 mμ.
2. The polyester tow for towing spinning according to claim 1, wherein 3. The polyester tow for sawing and spinning according to claim 1, wherein the average particle size of the inorganic fine particles is silica. 4. The polyester tow for towing fibers according to claim 1, wherein the fineness of the single fiber is 2.5 denier or less.