JP2549671B2 - Polyester narrow fabric - Google Patents

Description

TECHNICAL FIELD The present invention relates to a narrow woven fabric woven using polyester fibers, and particularly to a belt material having high strength and excellent wear resistance. is there.

(Prior Art) A narrow woven fabric (hereinafter sometimes simply referred to as a belt) is widely used in a width of about 3 to 30 cm as a seat belt, a sling belt, a container hanging belt, and the like.

These belts are required to have characteristics such as high strength, low elongation, abrasion resistance, weather resistance, and dimensional stability, and in recent years, polyester fiber is often used as a fiber material satisfying these characteristics.

(Problems to be solved by the invention) However, the belt obtained from the conventional polyester fiber has a small strength utilization ratio when it is made of a high-density fabric,
Therefore, it is difficult to make full use of the above yarn quality characteristics of polyester fiber, and the amount of yarn to be used must be increased in order to manufacture a belt having a predetermined tenacity. The fabric will be noticeable. for that reason,
It had the drawback of being inflexible and expensive.

(Means for Solving Problems) The inventors of the present invention have arrived at the present invention as a result of intensive studies to solve these drawbacks.

That is, in the present invention, the amount of terminal carboxyl groups is a polymer.
Consisting of less than 20 g equivalents per 10 ⁶ g, and said polyester fibers per 1 mm ^{2 of} fabric cross section
The gist is a polyester narrow woven fabric woven with a warp density of 6000 denier or more.

In the present invention, the polyester fiber means a polycondensate of an aromatic dicarboxylic acid and a glycol having 2 to 6 carbon atoms, and generally has a terminal carboxyl group (hereinafter referred to as [COOH]) concentration of polyester. And the polymer 10
⁶ is intended 30g or more per equivalent g. Such as [COO
Various methods have already been proposed for reducing the [H] concentration of polyester to a low [COOH] amount, for example, by reacting a polyester with an epoxy compound or by reacting a polyester with a bisoxazoline compound in a molten state. There are known methods for causing the problem. The polyester fiber having a low [COOH] concentration used in the present invention may be produced by any method, but the amount of [COOH] needs to be 20 g equivalent or less per 10 ⁶ g of the polymer. is there. 〔C
When the amount of [OOH] exceeds 20 g equivalent, the strength utilization factor of the narrow fabric is small, and it is not suitable for the narrow fabric (belt) of the present invention. Here, the strong utilization rate is obtained by the following equation (1).

Both short fibers and long fibers can be used as the polyester fibers.

Next, when used as a belt material, the warp density needs to be high in terms of dimensional stability and wear resistance, and the warp density needs to be 6000 denier or more per 1 mm ^{2 of the} cross-sectional area of the woven fabric. However, with normal polyester fibers, when the warp density exceeds 6000 denier, the belt's tenacity factor deteriorates. Regarding the fabric for belts, not only the warp yarns that make a strong contribution to the strength, but also the weft yarn density needs to be increased in the same way as the warp yarns in terms of the physical properties of the fabric. ， Therefore, the heat generated during cutting tends to accumulate inside the fabric. For this reason, fibers that are less likely to lose strength even when the temperature rises are required.

Therefore, in order to obtain a belt material with a high strength utilization ratio and good wear resistance, polyester fiber [COO
It is necessary that the H] amount is 20 g or less per 10 ⁶ g of the polymer, and the warp density of the polyester fiber is 6000 denier or more per 1 mm ² . Naturally, in order to satisfy the performance required as a belt for narrow width fabrics, various additional processes (softness, smoothness, antistatic, antifouling, flameproof, water repellent and oil repellent processes) and abrasion resistance are required. The resin processing for improving the property is performed. The narrow woven fabric of the present invention can be subjected to any of the above-mentioned accessory processing and resin processing.

(Operation) The high-density narrow woven fabric (belt) of the present invention has a high utilization factor which cannot be obtained by the conventional polyester belt. Therefore, there is a narrow woven fabric having a large strength with a small amount of yarn.

Although it is not always clear why this strong utilization rate is large, the present inventors presume as follows.

In other words, regarding the relationship between the strong utilization rate and the concentration of carboxyl groups, the lower the [COOH] concentration, the greater the resistance to wet heat deterioration, and the less wet heat deterioration in the dyeing and finishing process of narrow fabrics. . In addition, the resistance to frictional heat between fibers and internal heat generated when cutting polyester narrow fabric increases as the [COOH] concentration decreases. Thus, in the case of the narrow woven fabric of the present invention, the resistance to heat is large in both dry and wet conditions, and as a result, the high utilization factor is increased.

Next, the correlation between the warp density and the tenacity factor is estimated as follows.

First, the higher the weaving density of the warp, the greater the strength of the belt in the warp direction. Therefore, in order to obtain a high-strength belt, it is usually necessary to manufacture a fabric having a high warp density. On the other hand, in order to increase the warp density, it is necessary to sufficiently capture the warp, which requires increasing the density of the weft.
However, in the case of a belt in which both the warp and the weft are woven at a high density in this manner, the warp and the weft are curved at the intersections of the warp and the weft. The tenacity factor varies depending on the degree of this curvature, so that the warp density is usually 6000 per 1 mm ^{2 of the} fabric cross section.
Beyond denier, this high utilization will be significantly lower. This is because if the warp density is exceeded, the frictional heat between the fibers and the internal heat generated during cutting are less likely to be dissipated than the polyester narrow woven fabric and accumulate. Therefore, in the case of a high-density fabric, the heat accumulation is large, and the utilization rate of the heat is low. However,
When the low [COOH] concentration polyester yarn of the present invention is used, it is less likely to be deteriorated by wet heat, and even if heat is applied to the polyester yarn by frictional heat or internal heat generation, the polyester yarn is less deteriorated by the heat and has a high strength utilization factor. The belt is obtained.

(Examples) Hereinafter, the present invention will be specifically described with reference to Examples.

The production method of the low [COOH] amount polyester yarn used in the present invention and the evaluation method in the following examples are summarized below.

(1) Warp density Measure the thickness and width of the narrow fabric after dyeing with a caliper,
The denier of the polyester fiber of the warp per unit cross-sectional area (1 mm ² ) was calculated from the total number of polyester fibers used for each narrow woven fabric.

(2) Manufacture of polyester yarn with low [COOH] content Polyester of polymer using terephthalic acid as an aromatic carboxylic acid and ethylene glycol as a glycol component, and an inherent viscosity of 0.88, a terminal carboxyl group of 30 g equivalent / 10 ⁶ g polymer by a conventional method Chips were manufactured. The intrinsic viscosity here is phenol / tetrachloroethane (1/1 weight ratio).
It is measured at 20 ℃ using a mixed solvent. Next, an epoxy compound (N-glycidyl phthalimide) was added to the above chip in an amount appropriate for the reaction to reduce the amount of [COO].
H] amount of polyester was obtained. Next, a polyester yarn was obtained by melt spinning and drawing according to a conventional method.

(3) Tensile strength, tenacity factor (a) Tensile strength of polyester fiber It was calculated from an average value of a sample length of 20 cm, a pulling speed of 20 cm / min and n = 10 using an autograph DCS 5000 type manufactured by Shimadzu Corporation.

(B) Strength of belt Using an Autograph DCS 5000 type manufactured by Shimadzu Corporation, the tensile speed was 20 cm / min, the sample width was 5 cm, and the average value of n = 10 was calculated.

(C) Strength utilization ratio Width of cloth 5c based on the yarn strength of polyester fiber
It was calculated from the ratio of the total strength calculated from the total number of polyester fibers corresponding to m and the belt strength. (Refer to page 4, lines 1 and 2 of the specification) (4) Abrasion resistance A uniform type abrasion tester was used to perform an abrasion test on the belt according to JIS L-1018 at an abrasion frequency of 1000 times, and the appearance of the fabric The change was observed and evaluated by visual judgment.

(Evaluation criteria) ○: Almost no damage △: Pilling-like damage ×: Large damage Example and comparative example [COOH] concentration of polyester fiber is 5 to 30 g equivalent / 10 ⁶ g
Polymer weight, 1000 multi-denier / 192 filament multi-filament as a brand, warp density
A narrow woven fabric of 3000 to 7000 denier / mm ² was woven. This narrow fabric was dyed and finished by a conventional method to obtain a narrow fabric for belts. Next, the strength of each narrow fabric (belt) thus obtained was measured, and the relationship between the strength utilization rate and the terminal carboxyl group concentration was determined. The results are summarized in Table 1.

As is clear from the table, in the case of the narrow fabric of the present invention, it was a polyester belt having a high tenacity utilization rate, even though the warp density was high.

Next, the wear properties of the above belts were examined. The results are summarized in Table 2. As is clear from the table, in the case of the narrow width fabric of the present invention, the wear density was good because the weaving density of the warp was high.

Therefore, the [COOH] concentration of polyester is 20 g equivalent /
Using polyester fibers with a polymer weight of 10 ⁶ g or less,
A belt material with high strength utilization and good wear resistance could only be obtained by using a woven fabric with a warp density of 6000 denier / mm ² or more.

(Effect of the invention) The narrow width fabric of the present invention is a high density fabric, but is a narrow width fabric having a high utilization factor, and since the strength of the polyester fiber can be sufficiently exhibited, The thickness can be reduced and it can be widely used in the belt manufacturing field.

Claims (1)

(57) [Claims] 1. The amount of terminal carboxyl groups per 10 ⁶ g of polymer
Made of polyester fiber of 20g equivalent or less, and
A polyester narrow woven fabric in which the polyester fiber is woven with a warp density of 6000 denier or more per 1 mm ^{2 of the} cross section of the woven fabric.