JPS58191212A - Production of animal-hair like yarn - Google Patents

Abstract

PURPOSE:A synthetic high-molecular-weight substance is extruded through a special spinneret, coagulated, drawn and heat set to produce the titled yarn having the surface form, touch and appearance closely similar to animal hairs. CONSTITUTION:A synthetic polymer such as polytetramethylene terephthalate is extruded into a yarn through a spinneret that can apply rotation or vibration to the yarn immediately after extrusion such as a spinneret having holes of S-form cross section or two holes bored close to each other, immediately introduced into the cooling bath for solidification, then drawn and heat set.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manufacturing method for animal hair-like fines exhibiting a significantly improved face shape M, face touch and natural appearance.

Conventionally, various attempts have been made to produce animal hair-like fibers using synthetic fibers as starting yarns, but none of these methods has yet produced a product that exhibits the surface morphology and natural appearance of animal hair. is the current situation.

The most specific method for converting animal hair to date is to taper one end of the fiber.
This is based on simply imitating the tip shape of natural animal hair. According to this method, the above-mentioned am form 1 surface touch and natural appearance are undesirable, although a considerable improvement is obtained when looking only at the tip portion of the fiber.

As is well known, there are countless scale-like folds on the surface of animal hair, and the cross-sectional shape is uneven, and there are twists, embroideries, thick parts, thin parts ( There is a so-called "sick and thin" phenomenon, resulting in significant irregularities. It is believed that this irregularity presents the surface form 2 surface touch or natural appearance that is characteristic of animal hair 8I. K to improve this point.

Attempts have been made to extrude the polymer from a non-circular sand spinneret to form irregularly shaped yarns, or to consciously impart a thick-and-thin appearance by stretching at a lower or higher stretching ratio than the normal stretching ratio. there were. However, regarding the former, it is true that the cross section is irregularly shaped, but the yarn is uniform in the longitudinal direction, and regarding the latter, the repeating length of thick and thin parts like thick and thin that occurs during drawing is 10 am.
As a result, the cycle becomes much longer than the thick and thin pattern that is inherent in animal hair, and it becomes extremely poor in the appearance of animal hair.

In addition, all of the conventional methods for making animal hair start by imparting morphological changes to a part of the fiber, such as tapering the tip of the fiber, and this is the limit to making animal hair. It is no exaggeration to say that there was.

It is therefore an object of the present invention to provide synthetic fibers with animal hair-like fibers having a surface morphology 1 that closely resembles animal hair and a natural appearance, which has not been achieved hitherto.

As a result of intensive research aimed at achieving the above object, the present inventors have found that when converting synthetic fibers into animal hair, it is necessary to impart an essentially irregular surface form or cross-sectional form. They discovered that touch and natural appearance can be obtained and arrived at the present invention. That is, the present invention provides an animal hair-like synthetic polymer, which is characterized in that the synthetic polymer discharged from a spinneret that gives a swirling flow or oscillating flow to the yarn immediately after discharge is immediately introduced into a cooling bath, solidified, and then subjected to drawing and heat treatment. This is a method for molding fibers.

To explain the features of the present invention, first, the synthetic polymer must be discharged from a spinneret that can impart a swirling flow or vibration to the yarn immediately after discharge. In addition, there are many ways to create a swirling flow or an oscillating flow on the yarn immediately after discharge, which is in a flowing state. First, let's talk about a typical example of generating a swirling flow. When a high-viscosity synthetic polymer is extruded through the spinning hole, several swirling flows as shown in FIG. 2 are formed directly below the spinning hole.

When this swirling flow is formed, it is immediately introduced into a cooling bath and solidified, then wound and stretched to obtain an animal hair-like fiber having a twisted pattern as shown in FIG. Furthermore, by applying a suitable combustion treatment in addition to stretching, it is possible to add a crimp pattern as shown in FIG. 3 in addition to the twist pattern.

Next, we will discuss the method of applying an oscillating flow to the yarn immediately after discharge.As shown in Figure 4, the flows of synthetic polymers extruded at different linear velocities from two very close spinning holes are merged. A swing Ib flow occurs. This frequency is quite high and can even reach 50 vibrations per second. In addition to losses, swirling flows may also occur. In the presence of this oscillating flow, the yarn is immediately introduced into a cooling bath and solidified to form an undrawn yarn, which is then drawn to obtain a drawn yarn having a thick-and-thin appearance as shown in the diagram @S. Furthermore, if heat treatment is performed in addition to stretching, a crimp pattern as shown in FIG. 6 can also be obtained.

The synthetic polymer used in this experiment may be any 1a anchor-forming polymer such as polyolefin, polyester, or polyamide, but polyester, which has good chemical resistance and excellent spinnability, is preferred. Among these, polytetramethylene terephthalate fibers are preferred because their elastic modulus is close to that of animal hair.

Further, the cooling bath placed directly below the spinneret is usually a cold water bath, but hot water or other liquids may be used.

The stretching performed in the present invention may be dry heat stretching, but the fiber diameter is 0.
If the fiber is 1■ or more, it is preferable to stretch with warm water, and if the fiber is 1! In order to impart dimensional stability to the material, a heat treatment is performed, which may be a fixed length heat treatment, but if it is desired to change the texture, it is preferable to perform a heat treatment in a relaxed state.

In this way, the animal hair-like fibers obtained by the present invention generally have a non-circular cross section, and are not uniform in the longitudinal direction, but have a twisted, curled, or thick-and-thin appearance, which is characteristic of animal hair. It is thought that the texture and appearance resulting from the irregularity and non-uniformity of the material are achieved. In addition, by cutting these fibers to a certain length and gathering them into bundles, the tips are treated with chemicals or mechanically polished to create a tapered finish, which further improves the appearance of animal hair, creating the twists and curls unique to animal hair. This results in a surface morphology that closely resembles that of animal hair, the sliminess characteristic of animal hair, and a natural appearance without any artificial odor.

In addition, the fineness of the animal hair-like fiber of the present invention is preferably 10 to 200 d·. When the fineness is less than 10 de, the effect of the shape change imparted by the present invention is difficult to be reflected in the texture and appearance, and when the fineness exceeds 200 de, the fiber itself becomes rough and hard, and loses its animal hair-like appearance. There is a tendency.

Next, the present invention will be specifically illustrated by examples.

When polytetramethylene terephthalate was melt-spun using a spinneret having 16 S-shaped m-spinning holes as shown in FIG. 1, a swirling flow as shown in FIG. 2 was formed over approximately hα below the spinneret.

After solidifying the extruded polymer flow by installing water cooling at the bottom 4 holes of the spinneret, 100ya/II
An undrawn yarn was obtained by winding at a winding speed of n.

This undrawn yarn was stretched 2.3 times in warm water at 80°C.
Heat treated through a 11L heat heater at 0°C and
Winding at a speed of r111n, the average single yarn fineness is 95d.
The drawn yarn is 4. This drawn yarn exhibited a twisted form as shown in No. 22.

This fiber was cut to a length of 10α and 0 IQ, OO fibers were collected to make a bundle. When this bundle was treated in an atmosphere at 200° C. for 5 minutes, a slight shrinkage pattern as shown in Fig. 3 was added.

The concentration of this m bundle of fibers is 20% and the temperature is 100℃. After immersing it in an aqueous soda solution to a depth of 30 degrees, it was gradually pulled up and treated with aqueous solution, taking 90 minutes to raise it to the water. When this delicate bundle was washed with water and dried, a beautiful animal hair-like fiber with a teno (-) tip was obtained. Because it has a curly appearance, there is no artificial odor due to the uniformity found in conventional artificial animal hair; there is no artificial odor due to the uniformity, and there is a surface shape and surface touch (&: The appearance is reminiscent of Anlagora hair. The finish was 1].

Comparative Example 1 An experiment was conducted in the same manner as in Example 1 under the same conditions except that a normal round hole was used instead of the S-shaped spinning hole. The tips of the obtained fiber bundles resembled those of animal hair, but the cross-sections and appearance of the individual fibers were linear and uniform with no change, making them an artificial product. It also lacked flexibility and fluffiness, and was far inferior to l!JINFIJL's animal hair-like fiber.

Actual Example 2 3.3g of polyethylene terephthalate was extruded per minute from a spinneret having 16 spinning holes of 1 set of 2holes as shown in Fig.
m motion flow was formed. When observing the number of fluctuations with a strobe, it was approximately s o Hl. The extruded molten polymer was introduced into a water-cooled bath installed at a position approximately 31 mm below the spinneret to solidify it, and then wound at a speed of 50 mm/ml to obtain an undrawn yarn. This undrawn yarn was placed in warm water at 80°C for 30 minutes.
The yarn was stretched twice to obtain 200 denier/16 drawn yarns.

This drawn yarn had a thick-and-thin shape as shown in FIG. 5 in which there were thick and thin portions at intervals of about 5 cm, and the cross section had a daruma-like shape. Furthermore, when this drawn yarn is heat-treated in hot water at 100°C for 2 minutes, the fiber shrinks slightly and at the same time an irregular winding pattern as shown in Fig. 6 appears, resulting in an animal hair-like texture with an extremely soft surface touch. Power was obtained. Moreover, since this animal hair-like fiber has a suitable thick-and-thin mechanism, it has an even more natural appearance, and the glittering appearance characteristic of synthetic fibers was not felt at all.

[Brief explanation of the drawing]

Figure 1 is a flat view of the S-shaped spinneret, Figure 2 is a side view of the swirling flow just below the spinneret, Figure 3 is a side view of the swirling flow yarn with crimps added, and Figure 4 is a side view of the swirling flow just below the spinneret. FIG. 5 is a side view of the vibrating flow directly under the spinneret with one set of two holes, FIG. 5 is a side view of the vibrating fluid drawn yarn, and FIG. 6 is a side view of the heat treatment system for the vibrating fluid drawn yarn.

Claims (1)

[Scope of Claims] 0) The synthetic polymer discharged from a spinneret capable of imparting swirling flow or oscillating flow to the yarn immediately after discharge is immediately introduced into a cooling bath, solidified, and then subjected to drawing and heat treatment. A method for producing animal hair-like delicate products characterized by: (21) The method according to claim 1, when the synthetic polymer is polyethylene terephthalate. (3) The method according to claim 1, when the synthetic polymer is polytetramethylenethene-7-talate. 4) A method according to claim 1, in which animal hair-like fibers are cut into a certain length and bundled. (5) After the animal hair-like fibers *M are cut into a certain length and bundled, at least: A method according to claim 1.