JPH03124607A - Conveyor belt - Google Patents

Abstract

PURPOSE:To decrease contraction in the direction of a warp by forming the warp of a reinforcing cloth with nylon yarns whose size and tension strength are prescribed values, performing a prescribed heat treatment and setting coefficient of thermal contraction to a prescribed value in an article carrying conveyor belt. CONSTITUTION:As a warp extending along a longitudinal direction of a belt, a tensile nylon having size of 840d/pc. or more and tension strength of 100kgf/ cm or more is used to constitute a reinforcing cloth. Then, it is subjected to heat treatment with tension of 0.04 to 0.18g/d at 180 to 210 deg.C to set coefficient of thermal contraction along the direction of the warp for 1.5 to 2.0% at 150 deg.C immediately after heating for 30 minutes. According to this construction, thermal contraction toward the warp can be decreased and performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to conveyor belts, and relates to improvements in conveyor belts for conveying articles.

[Prior Art] Conventionally, as a conveyor belt for conveying goods, a backing rubber layer is layered on the back side of a tensile core body arranged in a belt shape, and a reinforcing cloth is further laminated on the front or front and back sides via an adhesive layer, and further on top of that Conveyor belts are known in which cover rubber layers are integrally laminated.

As the tensile strength core in the above conveyor belt, tensile strength fibers made of polyester fibers, vinylon fibers, aramid fibers, etc., which have excellent tensile strength and are lightweight, are used, and the reinforcing fabric is mainly used in the heald length direction with respect to the above fibers. It has been practiced to use a woven fabric made of a material whose warp yarns have approximately the same shrinkage rate along the .

[Problems with conventional technology]

However, in order to match the tensile strength core of the conveyor belt, heat shrinkage rate, strength, etc. of the above-mentioned woven fabric, it is necessary to use polyester fiber, vinylon fiber, aramid fiber, etc. for at least the warp, and as a result, the impact resistance However, there was a problem in that Tiron fiber, which is strong against external factors such as tear resistance and is inexpensive, could not be used.

In other words, when nylon fibers are used as the warp constituent fibers, nylon fibers are heat-shrinkable, so during the conveyor belt manufacturing process, when the belt constituent layers are laminated and heat-cured for final integration, the weaving There was a drawback that shrinkage occurred in the warp direction of the cloth, which caused the belt to become wavy and deformed, making it impossible to ensure surface flatness, which is an important element for a conveyor belt.

[Problem to be solved by the invention]

In view of the above-mentioned drawbacks, the object of the present invention is to provide an inexpensive and high-performance conveyor belt that uses a woven fabric whose constituent fibers are nylon fibers that have excellent tensile strength per denier as a reinforcing fabric, and has no shrinkage in the warp direction. This was done as a.

[Technology that led to solving the problem] That is, the conveyor belt of the present invention has a back rubber layer on the back side of the tensile strength core arranged in a belt shape, and a reinforcing cloth on the front or front and back sides via an adhesive layer. In a conveyor belt formed by laminating and further integrally laminating a cover rubber layer thereon, the reinforcing fabric has a warp thickness along the belt length direction of 840 d/1 or more and a warp tensile strength of 100 kgf/cm.
Constructed of tensile strength nylon yarn with a temperature condition of 18
Heat treated at 0~210℃, tension 0゜04~0.18g/d, and the heat shrinkage rate in the direction along the warp was 150'c, 30
The fabric is characterized in that it becomes a 1.5 to 2.0% nylon reinforced fabric immediately after heating.

[Effect]

The reinforcing fabric used in the conveyor belt of the present invention is made of nylon fibers.

Although nylon fibers have excellent tensile strength as mentioned above, they are heat-shrinkable and cannot be used as is as reinforcing fabric for conveyor belts.

Therefore, a woven fabric made of nylon fibers is subjected to heat treatment to impart shrinkage resistance under constant temperature conditions and tensile conditions.

As a result, the heat shrinkage rate is approximately the same as that of polyester fibers, vinylon fibers, aramid fibers, etc. that constitute conventional tensile strength members, and deformation during heat curing is prevented.

In this invention, the woven fabric serving as the reinforcing fabric has a warp thickness of 8
40d/1 or more, warp tensile strength 100kgf/cm
If a tensile strength nylon thread less than these values is used,
It lacks strength against external factors such as impact, and when a conveyor belt is lap-jointed in an endless manner, the cut end of the tensile strength core may not be sufficiently restrained in the wrap portion, and it may not function as a reinforcing cloth. This is because there is.

In addition, the above woven fabric has a temperature condition of 180 to 210°C, a tension of 0,
However, if the temperature is lower than 180°C, sufficient heat deformability cannot be imparted, and if it is higher than 210°C, the melting point of the nylon fiber is 215~0.
This is because the temperature approaches 220° C., and it becomes impossible to cut and process with the tensile force described below.

By the above treatment, it is possible to obtain a nylon reinforced fabric whose thermal shrinkage rate in the direction along the warp of the woven fabric is 1.5 to 2.0% immediately after heating at 150° C. for 30 minutes.

In this case, the heat shrinkage rate of the woven fabric is set to 1.5-2.0% because the heat shrinkage rate of the polyester fiber when heated at 150°C for 30 minutes is 0.5-2.5%, and the heat shrinkage rate of the vinylon fiber is 0.5-2.5%. is 1.0~1
．． 5%, and since the same aramid fiber has a shrinkage rate of -1.0 to 0.2%, this is to make it approximately equal to these shrinkage rates.

〔Example〕

The warp is 5c by combining three nylon threads with a fineness of 1260d.
A woven fabric was woven with a density of 54 nylon yarns between m and a weft of 4 nylon yarns with a fineness of 1260 d, and a density of 22 weft between 5cIl1.

The rate of itching was 15%.

Next, the woven fabric was heat-treated under the conditions shown in Table 1 to reduce the shrinkage rate of the woven fabric. Note that the heat shrinkage rates in Table 1 are those in the warp direction.

Table 1 Next, as a comparative example, the above woven fabric was heat treated under the conditions shown in Table 2 to reduce the shrinkage rate of the woven fabric. In Table 2, Comparative Examples 1 to 3 used the woven fabrics shown in Examples, Comparative Examples 1 to 2 were conducted to compare the effects of tension conditions, and Comparative Example 3 was conducted to compare the effects of temperature treatment conditions. .

Table 2 Table 3 The heat-treated woven fabrics obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were used as reinforcing fabrics for a 3-ply conveyor belt with a heald tension of 300 kg/cm.

When the shape of the conveyor belt after curing was observed, the results shown in Table 3 were obtained.

〔effect〕

As explained above, in this invention, even nylon woven fabric, which had conventionally had a high heat shrinkage rate and was considered unsuitable for use as reinforcing fabric for conveyor belts, can be used satisfactorily under heat treatment conditions, and can be used as reinforcing fabric for conveyor belts. can now be manufactured at low cost and without degrading its performance.

1. Indication of the case 1999 Patent Office No. 263611 2. Name of the invention Conveyor belt (spontaneous) 6. Contents of the amendment (11. ``This is because the tensile force described below will cut the fabric and it will no longer be able to be processed.'' is corrected by saying, ``The tensile strength described below will reduce the tensile strength and it will no longer function as a reinforcing fabric.''

3゜4゜Relationship with the amended case Patent applicant address 3-2-15 Meiwa-dori, Hyogo-ku, Kobe, Hyogo Prefecture Name (506) Hand-Chemical Co., Ltd. Representative Director and President Shogo Suzube

Claims (1)

[Claims] (1) A back rubber layer is layered on the back side of the tensile strength core arranged in a belt shape, reinforcing cloth is further laminated on the front or front and back surfaces via an adhesive layer, and a cover rubber layer is integrally laminated on top of that. In the conveyor belt, the reinforcing cloth is composed of tensile strength nylon yarn having a warp thickness along the belt length direction of 840 d/1 or more and a warp tensile strength of 100 kgf/cm or more, and a temperature condition of 180 to 210 ° C. Tension 0.04~
Heat treatment was performed at 0.18 g/d, and the heat shrinkage rate in the direction along the warp was 1.5 to 2.
A conveyor belt characterized by being made of 0% nylon reinforced cloth.