JPH05302233A - Belt - Google Patents

Abstract

PURPOSE:To provide the subject belt capable of readily processing the narrow part of narrow fabric such as a camera belt having a wide part and a narrow part. CONSTITUTION:Narrow fabric is woven by using, as a part of the weft yarn, a highly shrinkable polyester fiber such as a neopentyl glycol-copolymerized polyethylene terephthalate exhibiting >=5g/de strength under the maximum tensile load, >=25% shrinkage percentage in boiling water and >=0.2g/de thermal stress at 100 deg.C and having a peak at 70 to 160 deg.C in the thermal stress curve. The resultant narrow fabric is heat-treated, thus processing the narrow part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt, and more particularly to a narrow width fabric for producing a narrow woven fabric having a wide width portion and a narrow width portion such as a belt for a bag or a camera. The present invention relates to a belt whose part can be easily processed.

[0002]

2. Description of the Related Art Conventionally, in a belt such as a bag or a camera, in order to narrow the belt width in a portion other than the shoulder portion, a narrow width fabric of warp / weft is formed according to the width of the shoulder portion, and then the narrow width is obtained. Parts other than the shoulders of the woven fabric were folded and sewn in multiple layers to reduce the width. .. On the other hand, even if an operation of shrinking a part of the woven fabric by high temperature heat was performed, it was not possible to impart a desired partial width change.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in the background of the above-mentioned prior art, and produces a narrow woven fabric having a wide width portion and a narrow width portion such as a belt of a bag or a camera. In this case, it is an object of the present invention to provide a belt capable of easily processing a narrow width portion.

[0004]

DISCLOSURE OF THE INVENTION The inventors of the present invention have used a specific highly shrinkable polyester fiber continuously or in a block form on at least a part of the wefts of a belt base fabric, and treat the resulting base fabric with hot water. By doing so, they have found that a belt made of such a narrow woven fabric can be obtained, and have reached the present invention.

That is, according to the present invention, the strength at the maximum tensile load is 5 g / de or more, the boiling water shrinkage is 25% or more, and the thermal stress curve has a peak at 70 to 160 ° C.
A belt made of a warp / weft narrow woven fabric, which is formed by continuously or block-using at least a part of a weft yarn a highly shrinkable polyester fiber having a thermal stress value at 0 ° C. of 0.2 g / de or more. ..

The highly shrinkable polyester fiber constituting at least a part of the weft of the present invention can be easily obtained from a copolymerized polyester obtained by copolymerizing ethylene terephthalate unit with a third component in an amount of 8 to 30 mol%. Examples of the third component to be copolymerized with polyethylene terephthalate include bifunctional carboxylic acids such as isophthalic acid, naphthalene dicarboxylic acid, and adipic acid, neopentyl glycol,
Examples thereof include diols such as diethylene glycol and propylene glycol, but are not limited thereto. If the copolymerization amount of this third component is less than 8 mol%, the desired shrinkage cannot be obtained, while if it exceeds 30 mol%, fusion or melt discharge during solid phase polymerization performed by a known method is performed. When this happens, defective chips are likely to be caught.

Further, the third component to be copolymerized is not limited to one kind, but a plurality of them may be combined so that the total amount of copolymerization is 8 to 30 mol%.
You may copolymerize so that. Further, these polyesters may contain additives such as stabilizers and colorants.

The polyester fiber obtained by spinning such a polyester has a strength at the maximum tensile load of 5 g /
It is necessary that it is de or more, preferably 5.2 g / de or more, and the boiling water shrinkage is 25% or more, preferably 30 to 50%. Strength at maximum tensile load is 5g /
When it is less than de, when it is used as a belt base fabric, the fatigue resistance is low and there is a practical problem. If the boiling water shrinkage is less than 25%, it is difficult to obtain a narrow woven fabric having a desired width.

Further, the highly shrinkable polyester fiber constituting at least a part of the weft of the present invention has a fiber structure having a large strain as shown by a specific thermal stress curve. That is, in the thermal stress curve, a temperature of 75
Has a peak in the range of ~ 160 ° C and has a thermal stress at a temperature of 100 ° C of 0.2 g / de, preferably 0.25-
It is required to be 0.50 g / de. If the temperature at which the peak appears in the thermal stress curve is less than 75 ° C, strain is imparted in the vicinity of the glass transition point of the polymer, resulting in poor spinnability, and when stored for a long period of time, the shrinkage rate decreases and the desired width is obtained. It becomes difficult to perform the tightening process. On the other hand, if the temperature at which the peak of the thermal stress curve appears exceeds 160 ° C, 10
The thermal stress at around 0 ° C becomes small, and the tightening force during hot water treatment becomes insufficient. Thermal stress at 100 ° C is 0.2 g /
It is necessary to be equal to or more than de, and if it is less than this, the shrinkage rate of boiling water is less than 25% and the object of the present invention cannot be achieved.

The highly shrinkable polyester fiber having such characteristics has an intrinsic viscosity [η] of 0.6 or more, more preferably 0.70 or more, which is obtained by copolymerizing the above-mentioned third component.
It can be produced by melt spinning using 0.80 polyester and appropriately selecting and combining spinning conditions. For example, in melt spinning, the total drawn denier is discharged from the spinneret so as to have a total denier of 500 to 2,000, exposed to a heating atmosphere at a temperature equal to or higher than the melting point for delayed cooling, and then the oil agent is added in an amount of 0.05 to 10 Add% by weight. The unstretched yarn thus obtained may be wound into an unstretched package through a take-up roller and drawn in a separate step, or may be passed through the take-up roller and then continuously drawn without being wound. The take-up speed of the undrawn yarn is preferably 1,500 m / min or less in order to prevent oriented crystallization.

The stretching conditions are such that the temperature of the polyester fiber is not less than the glass transition point of the polyester fiber, for example, 75 to 95 ° C. with a heating roller.
After preheating at a temperature of, the film is drawn at a draw ratio corresponding to the speed of the take-up roller, for example, drawn in one stage at 2.0 to 5.0 times, and then wound or passed through a heated gas at room temperature to 160.
While heating at a temperature in the range of ° C, the film is stretched in the second stage and then wound. If the preheating temperature is less than 75 ° C, the boiling water shrinkage will be 2
Although it is possible to give a shrinkage ratio of 5% or more, stable yarn production cannot be performed, which is not preferable. When the temperature of the yarn exceeds 160 ° C due to heating, 10 in the thermal stress curve
The stress at 0 ° C. does not exceed 0.2 g / de, the peak of the thermal stress curve appears at a temperature exceeding 160 ° C., and the desired high shrinkage performance cannot be obtained.

The high-shrinkage polyester fiber as described above is continuously or blockwise used for at least a part of the weft yarns of the belt base fabric to weave a narrow warp / weft fabric, and then 7
By subjecting the weft yarn to a relaxation treatment with warm water or boiling water at 0 to 100 ° C, the belt of the present invention can be obtained. Other fibers may be used for a part of the weft thread constituting the narrow width portion as long as the shrinkage performance of the highly shrinkable polyester fiber is not hindered. As the narrow warp / weft woven fabric, a belt-shaped woven fabric designed to have a desired width is preferable. The relaxation treatment can be carried out by immersing the material in warm water or boiling water for 1 to 30 minutes.

[0013]

In the belt of the present invention, the boiling water shrinkage is 25%.
As described above, the thermal stress curve has a peak at a temperature of 70 to 160 ° C., and the thermal stress value at 100 ° C. is 0.2 g / d.
Since a part of the weft yarn is composed of the highly shrinkable polyester fiber of e or more, the weft yarn undergoes a hot water treatment or a hot water treatment to shrink the weft yarn to form a narrow width portion. It's extremely easy. Moreover, since the weft yarn is made of polyester fiber having a strength at maximum load of 5 g / de or more, it is excellent in fatigue resistance.

[0014]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. In the examples, various characteristics and evaluations were measured as follows. Intrinsic viscosity [η] It was determined from the viscosity measured in an ortho-chlorophenol solution at 25 ° C. Strength at maximum load (g / de) Using a tensile load measuring device (Tensilon UTM-II type), J
It was measured according to IS L-1074-64. The yarn strength was obtained by measuring the load at the time of cutting, repeating this 5 times, and dividing the average load by denier as in the following formula. Yarn Strength = Load / Denier Elongation (%) The elongation at break was determined at the same time when the yarn strength was measured, and this was repeated 5 times to determine the average elongation.

Boiling water shrinkage (%) The yarn is hung with a load of 1/10 of the corresponding denier and hung and marked at intervals of length L0, and it is tensioned in boiling water at 100 ° C. for 30 minutes. The treated yarn was hung with the same load applied again to the treated yarn, and the shrinkage ratio was calculated from the mark length L1 by the following equation. Boiling water shrinkage (%) = [(L0-L1) / L0] × 100 Thermal stress Kanebo Engineering Co., Ltd., stress measuring instrument KE-
Type 1 was used to convert the maximum stress value into stress per denier. Belt width shape After relaxation treatment in boiling water, the appearance was visually observed and evaluated as follows. ◯: There is a great difference in the width dimension between the wide width portion and the narrow width portion. X: There is no great difference in the width dimension between the wide width portion and the narrow width portion.

Example 1 A polyethylene terephthalate chip having an intrinsic viscosity [η] of 0.73 copolymerized with 10 mol% of neopentyl glycol (NPG) was melted in an extruder to obtain a pore diameter of 0.35 mm and a pore number of 250 ( The denier of the drawn yarn was metered and discharged from the spinneret of the hole) by a gear pump so that the total denier was 998 denier. The discharged yarn was passed through a heating atmosphere having a length of 300 mm and a temperature of 270 ° C. provided below the spinneret, and then a cooling air having a relative humidity of 65% and a temperature of 25 ° C. was 5 Nm ³ / min over a length of 300 mm. It was blown and cooled to solidify. The cooled and solidified yarn was applied with an oil agent by an oiling roller, and then temporarily wound as a package of undrawn yarn at a take-up speed of 1,000 m / min.

The undrawn yarn thus obtained is preheated by a heated supply roller, and then first-stage drawing is carried out between the rollers.
After performing the second stage stretching in a stretching gas bath, 290 m /
Winding at a speed of minutes gave a yarn with a total denier of 998 denier. The characteristics of the obtained drawn yarn are shown in Table 1.

The drawn yarn thus obtained is used as a weft yarn in a portion corresponding to a narrow width portion, 1,000 denier for the wide width portion and the warp, 250 filaments and a strength of 8.5 g / de, boiling water. Using a low shrinkage polyester fiber having a shrinkage rate of 8%, a narrow width fabric having a fabric width of 5 cm, a warp density of 20 warps / inch, and a weft width of 20 fibers / inch was prepared. The narrow fabric thus obtained was subjected to a relaxation treatment in a boiling water bath at 100 ° C. for 1 minute to produce a belt having a wide width portion and a narrow width portion as shown in FIG. The evaluation results of the shape of the obtained belt width are as shown in Table 1.

Examples 2 to 3 and Comparative Examples 1 to 3 Neopentyl glycol (NPG) or isophthalic acid (IPA) was used as the third component, and its copolymerization ratio and intrinsic viscosity were changed as shown in Table 1, A narrow woven fabric was prepared in the same manner as in Example 1 except that the total denier of the drawn yarn was changed as shown in Table 1 to manufacture a belt. Table 1 shows the evaluation results of the characteristics of the drawn yarn and the shape of the belt width.

[0020]

[Table 1]

[0021]

INDUSTRIAL APPLICABILITY The present invention provides a belt capable of easily processing a narrow width portion when producing a narrow width fabric having a wide width portion and a narrow width portion such as a belt for a bag or a camera. Since it is provided, it is possible to significantly reduce the labor in the working process of the narrow width portion, so that it exerts a great effect also on the productivity improvement.

[Brief description of drawings]

FIG. 1 is a plan view of a belt of the present invention.

FIG. 2 is an enlarged view of part A in FIG.

[Explanation of symbols]

 1 Wide part of the belt 2 Narrow part of the belt

Claims (1)

[Claims] 1. The strength under maximum tensile load is 5 g / de or more, the boiling water shrinkage is 25% or more, and the thermal stress curve is 70.
A warp composed of a highly shrinkable polyester fiber having a peak at ˜160 ° C. and a thermal stress value at 100 ° C. of 0.2 g / de or more for at least a part of the weft continuously or in a block manner. Belt made of narrow weft fabric.