JPH0651076B2 - Polyester fiber staple cotton for comforter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a staple cotton suitable for use as a futon, and has superior applicability to polyester fiber cotton which has been generally used conventionally. It is intended to provide polyester fiber cotton.

[Conventional technology]

Synthetic fiber cotton such as polyolefin fibers, polyacrylonitrile fibers, and polyester fibers has been widely used for bedding applications due to its excellent bulkiness, and in recent years, in particular, composite spinning and asymmetric cooling spinning have been performed to further improve its performance. Synthetic fiber cotton with three-dimensional crimps, etc., has been developed and commercialized. However, while the synthetic fiber cotton produced by the forward type three-dimensional crimp consisting of only one direction improves the bulkiness of the product when there is no load, the entanglement between single fibers is improved. If the weight is lowered, the handling property during cotton making becomes poor, and the bulk reduction (so-called settle) when a load is applied becomes large. On the contrary, if the number of crimps is increased, the handling property during cotton making and the sagging resistance are improved, but the bulkiness under load is reduced. After all, under any of the conditions, staple cotton that satisfies both bulkiness under no load, sag resistance and handleability during cotton making has not been obtained.

In order to improve these drawbacks, hollow fiber, single fiber,
Although various attempts have been made to change the fiber length and the oil agent, the above contradictions have not been resolved yet.

[Means for Solving the Problems]

The present invention has been completed as a result of various studies to solve these problems, that is, a polyester fiber staple cotton having a three-dimensional crimp, in which the forward direction three-dimensional crimp is contained. A polyester fiber staple cotton for a futon, characterized in that fibers are present in a proportion of 90% or less and 50% or more and inversion type three-dimensional crimped fibers in a proportion of 10% or more and 50% or less.

The fact that a corrugated crimp (inverted three-dimensional crimp) having a three-dimensional property can be obtained by stretching mechanically crimping a synthetic fiber having latent three-dimensional crimp performance is disclosed in, for example, Japanese Patent Publication No. -48091. However, with such a staple cotton having only the reverse type three-dimensional crimp,
The bulkiness of the product cotton under no load is low, so it is difficult to put it into practical use.

As a result of thorough analysis and examination of such technical background, the present inventor has found that the reversal type crimp is not necessarily obtained only by the mechanical crimp after drawing, and has a three-dimensional latent crimp performance. Is obtained by applying pressure with a pressure roller under tension after stretching, and surprisingly, when no reverse pressure is applied from the stuffing box of the crimper, It is possible to arbitrarily change the mixing ratio of the forward direction three-dimensional crimped fibers and the reverse type three-dimensional crimped fibers by changing the pressing force, and it is possible to mix both three-dimensional crimped fibers extremely uniformly. I found it.

When the crimping machine is used after stretching by the method according to the above-mentioned Japanese Patent Publication No. 51-48091, almost all the amount of the crimping machine is a reversible three-dimensional crimped fiber under the condition that the crimping machine is stably fed and crimped. Therefore, it is impossible to obtain a homogeneous mixture of the forward-direction type three-dimensional crimped fiber and the reverse type three-dimensionally crimped fiber, but if the stuffer of the crimping machine is not opened, the nip roller of the crimping machine is not available. May be substituted for the metal pressure roller.

For example, a latent crimping performance was imparted by asymmetric cooling 10
After drawing a spinning raw yarn of 0,000 Dr to 2.5 times, it is passed through a metal roller with variable pressure, and then a relaxation heat treatment at 160 ° C. is performed to develop a crimp, which is a reversal type three-dimensional crimped fiber. Fig. 1 shows the relationship between the ratio and the pressing force of the metal roller. As shown in.

As can be easily understood from FIG. 1, the generation ratio of the inverted three-dimensional crimped fiber is 80% per 1 cm of the pressing length of the metal roller.
There is almost no up to KG / cm, and it gradually increases as the applied pressure increases, and becomes almost 90% or more when the applied pressure exceeds 180 KG / cm. The staple cotton produced in this manner has a smaller decrease rate of the bulk under load relative to the bulk under no load of the product cotton as the proportion of the reversible three-dimensional crimped fiber is higher, and is stronger in intentional settling resistance. Although there is a slight decrease in the bulkiness, the bulkiness under no load is far superior to that in the case where the number of crimps is increased in the forward direction type three-dimensional crimped staple cotton.

For example, it is desirable that the mixing ratio of the reversible three-dimensional crimped fiber in a field requiring sublimation in a no-load or small-load region such as a hanging futon, a stuffed animal, and a cotton pad is 10% or more and 50% or less.

As described above, by setting the mixing ratio of the reversal type three-dimensional crimped fiber to the optimum ratio, it is possible to supply the staple cotton extremely suitable for the futon.

Further, as can be seen from FIG. 1, the ratio of the reversible three-dimensional crimp fiber can be set at an arbitrary ratio by fixing the degree of latent crimp performance of the spun raw yarn and the pressure of the pressure roller. can get.

The forward type three-dimensional crimp described in this section is a spiral-like three-dimensional crimp, and the inversion type three-dimensional crimp is a three-dimensional crimp in which each crimp form is inverted to an omega type (Ω). Contraction,
Since both of them show a crimped form in a fiber bundle unit, they can be easily counted visually and the mixing ratio of both can be calculated.

Further, the target fibers having latent crimping performance in this portion may be those obtained by composite spinning, those obtained by asymmetric cooling spinning, and any other, and the fiber fineness and the fiber cross-sectional shape are not particularly limited.

Example 1 Polyethylene terephthalate having an intrinsic viscosity of 0.60 was melted, melt-spun through a spinneret having a hollow discharge hole, and asymmetrically rapidly cooled. The obtained unstretched yarn was bundled into an unstretched tow and stretched 2.5 times. After that, it was passed through a pair of metal pressure rolls and further subjected to relaxation heat treatment at 160 ° C. Further, it was cut into 57 mm to manufacture hollow staple cotton.

Further, the staple cotton is made into cotton and the initial load (0.5 g / cm
² ) and the measured specific volume of the molded product under load (10 g / cm ² ) are shown in Table 1. As comparative examples, those which do not pass through the pressure metal roll, those which do not pass through the pressure metal roll and whose number of crimps is increased, and those in which the crimping machine stuffed box is operated to give a regular mechanical crimp Was added.

The following can be said from Table 1. That is, (1) No. 1 had a sufficient initial bulk, but had a low bulk under load and had a large settling.

(2) No. 2 and No. 3 had a large initial bulk, and because of the cohesiveness of the molded product, the bulk under load was considerably high. Especially suitable for hanging futon.

(3) No. 4 and No. 5 are inferior in initial bulk.

(4) No. 6, No. 8 and No. 9 all have sufficient bulk under load, but their initial bulk is too low to be of commercial value for hanging futon.

[Brief description of drawings]

FIG. 1 shows the synthetic crimped fiber with latent crimping performance, which is occupy in the three-dimensional crimped fiber developed by the pressure applied by a pressure roller in a tensioned state after stretching and the relaxation heat treatment thereafter. It is a figure which shows the ratio of an inversion type three-dimensional crimp fiber.

Claims (1)

[Claims] 1. A polyester fiber staple cotton having a three-dimensional crimp, wherein the forward direction three-dimensional crimp fiber is 90% or less and 50% or more, and the reversal type three-dimensional crimp fiber is 10% or more and 50% in the cotton fiber. Polyester fiber staple cotton for hanging futon characterized by being present in the following proportions.