JPH073565A - Production of polyester fiber for padding - Google Patents

Abstract

PURPOSE:To provide the fibers having straight line fiber axis leading to developing fastener phenomena, also having such bulkiness as to be high in resilience. CONSTITUTION:The objective polyester fibers can be obtained by drawing undrawn polyester filament yarn tows followed by imparting the resultant tows with crimps, opening directly, conducting heat treatment in a relaxed state and then cutting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a polyester fiber for batting, and more particularly to a method for producing a polyester fiber for batting having good bulkiness.

[0002]

2. Description of the Related Art Conventionally, in the production of polyester fibers for cotton wadding, in order to bring about crimp expression ability, a sub-tow that has been subjected to asymmetric cooling is stretched, crimped, and then subjected to a relaxation heat treatment (crimping). It is known to carry out contraction expression) and cleave. However, when this method is used, the constraint between the fibers in the tow state is strong, the crimp developing ability is suppressed, and good bulkiness is not obtained. For this reason, a method of applying crimps after stretching, cutting and then relaxing heat treatment (developing crimps) is used. However, when the relaxation heat treatment (crimp development) is performed after the cutting step in this way, although the crimp is developed, the fiber axis is curved, so if the webs coming out of the card are stacked and held down, Phenomenon in which comrades get entangled and cannot return to their original state (fastener phenomenon)
There was a problem that occurred.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the situation described above, has sufficient crimp expression, and has improved bulkiness without causing a fastener phenomenon. The present invention provides a method for producing a polyester fiber for use.

[0004]

The present invention includes: A method for producing a polyester fiber for wadding, which comprises spinning, drawing, crimping, opening the fiber in a tow state, then performing a relaxation heat treatment, and cutting. 2. 2. The method for producing a polyester fiber for wadding according to the above 1, wherein the opening is performed by using a roller having protrusions, a guide having protrusions, air, or a combination thereof. By doing so, the purpose is achieved.

As the polyester fiber used in the method for producing a polyester fiber for wadding according to the present invention, a polyester-based polymer which is usually used for wadding can be used and is not particularly limited. The polymer is spun using generally known methods and equipment, stretched in the tow and crimped. The spun yarn is preferably lightened from the viewpoint of use as a cotton stuffing, and therefore, the fiber is preferably a hollow cross-section fiber. In the method for producing a polyester fiber for wadding according to the present invention, after crimping, the fiber is opened in a tow state, then subjected to a relaxation heat treatment, and then cut.
If the opening step is not provided, the bulkiness becomes poor and the object of the present invention cannot be achieved.

[0006] Further, it is efficient and preferable that the opening is performed by using a roller having a protrusion, a guide having a protrusion, air, or a combination thereof. When a roller with protrusions and a guide with protrusions are used for opening, the shape of the protrusions, the number of protrusions, and the like can be appropriately determined in consideration of the opening efficiency and the like. When air is used for opening, the tow is blown with air from an air nozzle, but the air pressure, the shape of the nozzle, etc. can be appropriately determined in consideration of the opening efficiency.

The single fiber degree of the fiber finally obtained by such a method for producing a polyester fiber for wadding according to the present invention is preferably 5 to 20 d from the viewpoint of wadding use. It is particularly preferable that it is hollow and has a thickness of 5 to 20 d. Further, the crimp frequency ratio of the fiber finally obtained by the production method according to the present invention is preferably 3 to 5 from the viewpoint of imparting sufficient bulkiness. Furthermore,
Some polyester fibers for wadding are separated after cutting and some are in the shape of a scallop while keeping the aggregate state. The apparent length of the scallop-shaped aggregate (hereinafter, natural fiber length) And the ratio of the actual fiber length obtained by stretching the crimp to 0.
It is more preferably 3 or more from the viewpoint of imparting good bulkiness.

An example will be described below.

EXAMPLE A polyester polymer was discharged from a die heated to 275 ° C., and undrawn yarns collected at 1650 m / min were aligned with tows such that the total fineness after drawing was 700,000 denier. This undrawn yarn tow was passed through an oil bath and drawn 2.5 times in a heated liquid. After that, crimping was applied by a press-type crimping device. After crimping, the tow was passed through a guide having protrusions, subjected to relaxation heat treatment, and then cut to obtain a polyester fiber suitable for use as a cotton wadding.

Then, the obtained polyester fiber was evaluated for bulkiness using a card. For comparison, those that did not pass through the opening machine were evaluated at the same time. As for the bulkiness characteristics, the polyester fibers passed through the guides with protrusions showed good bulkiness characteristics in the initial bulk, compressed bulk, and recovered bulk of 3 to 15%, as compared with the polyester fibers that did not pass through the opening machine. The evaluation results are shown in Table 1.

[0010]

[Table 1]

[0011]

EFFECTS OF THE INVENTION According to the production method of the present invention, it is possible to provide a high-quality polyester fiber for batting which has good bulkiness and has both crimp expression and fiber axis linearity, which have hitherto been difficult. It has become possible. As described above, the present invention can exert a great industrial effect.

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Claims (2)

[Claims] 1. After spinning and drawing and further crimping,
A method for producing a polyester fiber for wadding, which comprises opening the fiber in a tow state, then performing a relaxation heat treatment, and cutting. 2. The method for producing a polyester fiber for wadding according to claim 1, wherein the fiber opening is performed by any of a roller having a protrusion, a guide having a protrusion, air, or a combination thereof.