JPH11246018A - Conveyer belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve flatness on surfaces of a sail cloth layer, strike through of rubber, and resistance against buckling by respectively setting an application weight ratio of longitudinal threads to transverse threads of the sail cloth layer and a cover factor of longitudinal threads and transverse threads in specific ranges, in a conveyer belt having the sail cloth layer on the surface side of its belt body. SOLUTION: In a belt body 1 in which a plurality of reinforcement layers 3 are buried in a rubber layer 2 and a sail cloth layer 4 is provided on its surfaces, the sail cloth layer 4 is set so that an application weight ratio longitudinal threads/transverse threads) per area of woven longitudinal threads to transverse threads is in a range of 1.1-1.4. The sail cloth layer 4 is formed so that total of cover factors K of longitudinal threads and transverse threads is in a range of 4300-4500, where the cover factor K is defined by formula K = (D/specific weight of a thread)<1/2> × thread density. Where, D is denier (weaving degree), thread density is number of threads per 5 cm width [number/5 cm]. Thus, flatness on a surface 4a of the sail cloth layer 4 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt, and more particularly, to a conveyor belt which satisfies both the flatness of the surface of a canvas layer on which a hydraulic slurry or the like is placed, the penetration of rubber, and the buckling resistance. About the belt.

[0002]

2. Description of the Related Art For example, when a hydraulic slurry containing reinforcing fibers is molded into a strip, cut into a predetermined size, and then heated and sintered to produce a roof tile or a wall plate, etc.
A conveyor belt having a canvas layer provided on the surface of a belt body is used. A hydraulic slurry containing reinforcing fibers is formed into a belt while being conveyed on the conveyor belt.

In such a conveyor belt, the surface of the canvas layer on which the hydraulic slurry is placed has a uniform flatness, the rubber does not strike through the surface of the canvas layer, and the pulley has a pulley. There is a demand for characteristics such as the ability to follow and be difficult to buckle. Since the slurry adheres to the surface of the canvas layer during the molding of the belt-like body, the surface of the canvas layer is washed with water while scraping off the adhered substances with a scraper when the conveyor belt passes on the return side. At that time, if the surface of the canvas layer has irregularities, the scraper repeatedly hits the surface, and the yarn breaks at an early stage, so that uniform flatness is required.

[0004] Further, the canvas layer is adhered to the belt body via rubber rubbed on the back surface thereof. If the rubber slips through to the surface when the rubber is rubbed in, the canvas layer hardly contains water, so it is required that the rubber does not strike through the surface of the canvas layer. This property can be obtained by increasing the weave density,
If the height is extremely high, a convex portion is generated on the surface of the canvas layer due to the lifting of the weft yarn, so that uniform flatness is impaired.

[0005] When the belt is buckled and bent, the flatness of the surface of the canvas layer is lost, and the surface is rubbed by the scraper as described above, so that yarn breakage easily occurs. As for these characteristics, there is a problem that when one of them is improved, the other tends to be deteriorated, and it is difficult to satisfy them simultaneously.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conveyor belt having a canvas layer on which a hydraulic slurry or the like is placed.
An object of the present invention is to provide a conveyor belt capable of simultaneously satisfying buckling resistance.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a conveyor belt provided with a canvas layer on at least the surface side of a belt body. Use weight ratio (vertical yarn / weft yarn)
Is set in the range of 1.1 to 4.1, and the total of the cover factor values K of the warp yarn and the weft yarn respectively obtained by the following formulas is set to 4300 to 4500.

K = (D / specific gravity of yarn) ^1/2 × yarn density where D: denier yarn density: book / 5 cm The structure of the canvas layer on which the hydraulic slurry is placed is specified as described above. Optimizing the relationship between the warp yarn and weft yarn thickness and weaving density enables the surface of the canvas layer to be formed flat and the adhesive rubber rubbed on the back of the canvas layer to the surface. It is possible to suppress the slipping out, and it is possible to easily follow the pulley and make it hard to buckle.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be specifically described below with reference to the embodiment shown in the drawings. FIG. 1 shows an example of the conveyor belt of the present invention, 1 is a belt body,
2 is a rubber layer, 3 is a reinforcing layer, and 4 is a canvas layer. Rubber layer 2
A belt-shaped belt body 1 is formed by embedding two reinforcing layers 3 and 3 in the belt, and a canvas layer 4 is provided on the surface of the belt body 1 (the outer surface when the belt is connected endlessly). .

The canvas layer 4 has a woven warp / weft yarn weight ratio per unit area (warp / weft) of 1.1.
It is set in the range of 4.1. This weight ratio is 1.1
If the diameter is smaller, the warp yarn is likely to have a warped structure in which the warp yarn meanders (crimps), so that the warp yarn is easily worn.
Conversely, if it is larger than 4.1, pulley followability deteriorates, and buckling easily occurs.

Further, the canvas layer 4 has K = (D / specific gravity of yarn)
^{In the} cover factor value K defined by the expression of ^1/2 × the yarn density, the total of the cover factor values K of the warp yarn and the weft yarn is in the range of 4300 to 4500. Here, D in the formula is denier (fineness), and the yarn density is the number of yarns per 5 cm width [lines / 5 cm]. If the total of the cover factor values K is less than 4300, the weaving density is reduced, and rubber strike-through tends to occur. Conversely, if it exceeds 4500, the weaving density becomes too dense, and as a result, the warp yarn is lifted due to the contraction of the warp yarn, and the flatness deteriorates.

As described above, according to the present invention, by specifying the structure of the canvas layer 4 on which the hydraulic slurry or the like is placed as described above, the relationship between the thickness of the warp yarn and the weft yarn and the weaving density can be optimized. In this case, uniform flatness of the surface 4a of the canvas layer 4 can be obtained, and the rubber rubbed for adhesion is used for the surface 4a.
In addition, it is possible to suppress so-called rubber strike-through, and it is possible to follow the pulley and to prevent buckling. Therefore, belt durability can be improved.

In the present invention, the weaving structure of the canvas layer 4 can be the same as the conventional one, for example, a plain weave or basket weave. As those weaves,
Either shuttle weave or rapier weave may be used, but rapier weave is preferred. The total cover factor value is preferably in the range of 2150 to 3600 for the warp yarn and 860 to 2250 for the weft yarn as the cover factor value K for the warp yarn and the weft yarn as described above.

As the yarn used for the warp yarn and the weft yarn,
Any yarn may be used as long as it is conventionally used for the above-described conveyor belt. Preferably, cotton yarn or mixed yarn is used. As the cotton yarn,
Preferable examples include a mixture of cotton and polyethylene terephthalate (PET). In the above-described embodiment, the structure in which the canvas layer 4 is provided on the front surface side is adopted. However, the present invention may have a structure in which the canvas layer having the above-described configuration is also provided on the back surface side.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a conveyor belt having the structure shown in FIG.
As shown in Table 1, the present invention belts 1 to 6 and the comparative belts 1 to 6 differing in the total of the used weight ratio per unit area of the warp yarn and the weft yarn (vertical yarn / weft yarn) and the cover factor K as shown in Table 1
And No. 4 were produced respectively. The thickness of each test belt is 15mm
Is common. Table 1 also shows the material, twist structure, weaving density, and used weight of the warp yarn and the weft yarn of the canvas layer.

Each of the test belts was subjected to an evaluation test of buckling resistance and flatness under the following measurement conditions, and an evaluation test of rubber strike-through of the canvas layer of each test belt was performed under the following conditions. However, the results shown in Table 1 were obtained.

Buckling resistance Each test belt is 50 mm in a diameter range of 100 mm to 500 mm.
The buckling resistance was evaluated based on the followability when wound around each pulley whose diameter was changed every time. Those that completely followed the pulley having a diameter of 200 mm were rated as ○, and those that buckled without following were rated as x.

Flatness In each test belt, the weft floating phenomenon and the warp bending phenomenon were visually observed. Those in which the weft was raised and those in which the meandering width of the warp was significantly larger than the weft (crimp) were evaluated as x, and those in which the flatness was good were evaluated as ○.

Rubber strike-through An unvulcanized rubber sheet is placed on the back surface of the canvas layer used for each test belt, and press vulcanization is performed at a pressure of 0.25 MPa for 20 minutes. Were not exuded, and those exuded were evaluated as x.

[0020]

[Table 1]

As is clear from Table 1, the belt of the present invention, in which the total weight ratio of the warp yarn and the weft yarn per unit area of the canvas layer and the cover factor value K are specified, has a buckling resistance,
It can be seen that both the flatness and the rubber strike-through resistance of the canvas layer are good.

[0022]

As described above, the present invention relates to the sum of the weight ratio per unit area of the warp yarn and the weft yarn of the canvas layer provided on the surface side of the belt body and the cover factor value of the warp yarn and the weft yarn. Since the values are specified as described above, it is possible to simultaneously satisfy the flatness of the canvas layer surface, the strike-through of rubber, and the buckling resistance.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part showing an example of a conveyor belt of the present invention in a longitudinal section in a belt width direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt main body 2 Rubber layer 3 Reinforcement layer 4 Canvas layer 4a Surface

Claims (3)

[Claims] In a conveyor belt having a canvas layer provided on at least the surface side of a belt main body, the weight ratio per unit area of the warp yarn and the weft yarn of the canvas layer on the surface side (vertical yarn /
Conveyor belt in which the weft yarn) is set in the range of 1.1 to 4.1, and the total of the cover factor values K of the warp yarn and the weft yarn obtained by the following formulas is 4300 to 4500. K = (D / specific gravity of yarn) ^1/2 × yarn density where D: denier yarn density: book / 5cm 2. The conveyor belt according to claim 1, wherein the back side fabric layer has the same configuration as the front side fabric layer. 3. The conveyor belt according to claim 1, wherein the warp yarn and the weft yarn are each made of a cotton yarn or a mixed cotton yarn.