JPS6332891B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for imparting crimp to a composite filament, and more specifically, the present invention relates to a method for imparting crimp to a composite filament. It relates to a method of manufacturing well.

Conventionally, the method of forming a composite fiber in which two types of polymer components with poor affinity for each other are bonded together along the length of the fiber and dividing the two components is to apply a severe bending action after weaving to separate the two components. A method of peeling and dividing the components (Japanese Patent Publication No. 39-933), a method of chemically decomposing or dissolving one of the components, or a method of feeding the fibers into an air jet and dividing them by jet force (Special Publication No. 39-933). Japanese Patent Publication No. 39-29636) is known, and as a method of crimping and separating two components, false twisting is known as disclosed in Japanese Patent Publication No. 48-28002. However, in the method of (2), it is generally difficult to obtain bulky fabrics because it is not possible to crimp the yarn by simply separating and peeling the two components.
Since the material is simply separated and peeled into two components by the jet force using an air jet at room temperature, only sagging and intertwining are imparted, and so-called crimp is not maintained. In this method, the air is at room temperature, and the 2 pieces are divided, peeled, looped, and entangled.
Because the components are not heat-set, not only does it result in a thermally unstable mixed fiber yarn, but even if there is a difference in heat shrinkage between the two components, it does not have the same bulkiness as the fabric obtained by the method. Fabric is difficult to obtain. In this method, the productivity is not sufficient because it relies on false twisting, a method that has limits on the applicable yarn fineness and processing speed.

In this regard, the present inventor has developed a composite fiber in which two or more components with poor affinity for each other are bonded together along the longitudinal direction of the fiber, using a heated air stiffener, which is a highly productive crimping device. When the material was supplied and crimped, it was discovered that the components were almost completely divided at the same time as the crimping was applied, leading to the present invention.

That is, the method of the present invention currently has the most high-speed followability as a means for applying crimp to yarn, and is a promising method in the future. A composite filament having a structure in which two or more types of polymer components having poor affinity for each other are bonded along the longitudinal direction of the fiber as illustrated in FIGS. The yarn is ejected from a jet nozzle with a heated air jet flow and rapidly pushed into the relaxation device, giving a strong impact to the yarn. At the same time, each component is The purpose is to perform the division and also set the crimping. The yarn to be supplied is one that has been completely drawn, and the methods include feeding the drawn yarn, docking it with a drawing machine to create a so-called draw texture, and docking it with a drawing machine to create a so-called spin draw texture. Either method can be used. Which method to adopt is related to cost, but in general, it is desirable to adopt the method below when the total denier of the supplied yarn is up to 150 ^De , and especially when the total denier exceeds 500 ^De .

Next, regarding the cross section of the composite fiber to be supplied, at least two components are exposed on the fiber surface, as shown in FIGS. It is necessary that the area be divided into multiple parts. If each component is in an asymmetrical positional relationship, yarn bending may occur during spinning, which is undesirable. Furthermore, if the segment formed by one divided component is made too thin, it may cause catching in the relaxation device, which is not preferable, and the segment must have a thickness of at least 0.1 De. In addition, the number of segments to be divided is 2 in the example shown in Fig. 1, but it may be any number greater than 2 as long as the nozzle can be manufactured.
A mixture of various cross-sectional shapes may be used. In particular, in the hollow one shown in Figure 4 and the three-component system shown in Figure 5, the A and C components have mutual affinity, and the B component is a combination of polymers that have poor affinity. It can also be applied. Moreover,
In the latter case, the segments of the A and C components can be curled by relaxation heat treatment. In order to obtain yarns having these composite cross sections, for example, Japanese Patent Application No. 1987-
This can be done by applying a cap device such as that proposed in No. 94714 or Japanese Patent Application No. 54-2591.

Next, we will talk about the equipment for crimping such composite filaments.
A device such as that disclosed in the above publication can be applied. That is, as shown in FIG. 6, a heated air injection nozzle 3 is provided at the upper part of the relaxation device 4, and at the same time as the yarn 1 is introduced, it is pushed into the relaxation device 4 and deposited, and the crimped filament is inserted from below the relaxation device 4. Use a device designed to pull out 5. 2
is a heated air inlet.

Further, the relaxation treatment device 4 may be constructed to be heated separately. The heated air may be one using steam.

Basically, the key point is to apply crimp by colliding and pushing the yarn into the relaxation device at high speed using an injection nozzle that basically uses heated compressed gas.

The fiber thus obtained is a bulky yarn containing two or more components with excellent mixing properties, and can be applied not only to general clothing applications but also to thick filaments for carpets. And for clothing,
A heathered, spun-like yarn can be obtained, and in the carpet field, it can be used for a variety of purposes such as improving color tone, gloss, and rigidity.

Any combination of polymers may be used as long as they have poor affinity for each other, but due to the performance and versatility of the polymer components as fibers, polyesters represented by polyethylene terephthalate, nylon 6, and nylon 66 are typical examples. It is desirable to use polyamides and copolymers thereof, but if care is not taken, for example, polyester copolymers containing sulfonic acid metal salts may have an affinity with nylon, making them difficult to split. , and something like this cannot be applied.

Next, regarding the conditions for implementing the present invention, it is necessary to consider various conditions depending on the polymer to be applied, but in general, the heating temperature of the heated air jet needs to be 100°C or higher, preferably 150°C or higher, and the air pressure requires 2Kg/cm ² or more.

Yarn speed can be as low as 50m/min.
Machining at a speed of 500 m/min or higher is advantageous in terms of productivity and cost.

Although it is almost possible to divide the components according to the present invention, if complete division is not possible depending on the cross-sectional shape, a known chemical treatment may be added after forming into a fabric etc. is also an effective means.

Example Polyethylene terephthalate (component A) with an intrinsic viscosity [η] of 0.65 and nylon 6 (component B) with an intrinsic viscosity [η] of 1.1 were combined and composite-spun and stretched to form a 300 de/20 fil. yarn was produced. The discharge ratio was adjusted so that one segment of polyester and one segment of nylon after division was 1.5 de and 3.5 de, respectively. Using this drawn yarn, it was introduced into an air stuffing device as shown in Figure 6, heated air at a temperature of 285°C, a pressure of 4.0 Kg/cm ² , and a speed of 600 m/min.
It was crimped. The obtained yarn was almost divided into each component, and when it was knitted into a jersey and dyed, a bulky wool product was obtained.

[Brief explanation of the drawing]

1 to 5 are cross-sectional views showing specific examples of composite filaments applied to the present invention, and FIG. 6 is a schematic view showing an example of a crimping device used to carry out the present invention. 1: supply yarn, 2: heated air inlet, 3: injection nozzle, 4: relaxation treatment device, 5: crimped filament.

Claims (1)

[Claims] 1 A composite filament with a structure in which two or more types of polymer components having poor affinity for each other are bonded together along the longitudinal direction of the fiber and can be separated into at least two components is ejected from an injection nozzle using a heated air jet flow and deposited in a relaxation device. A method for producing a mixed fiber filament, characterized in that it is crimped and compressed while at the same time being divided into each component.