JPH09239845A - Method for connecting conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and more completely adhere by sandwiching a canvas which has an uneven part on one surface and is easy to release from vulcanized rubber between adhesive surfaces, vulcanizing it, then releasing the canvas, and adhering the part with an adhesive. SOLUTION: The conveyor belt in which one of an upper surface cover rubber 1, a lower surface cover rubber 2 and aramid-reinforced layer 3 coating both the upper and lower surfaces with thin rubbers and one layers of nylon breakers 4 coating the upper and lower surfaces with thin rubbers are laminated on the upper and lower surfaces of the layer 3 is molded. At that time, a polyester canvas 5 is sandwiched between the parts to be at least adhered, i.e., the parts to be scheduled to be adhered, and then vulcanized. After the vulcanization, the canvas 5 is released immediately before adhering, the surface is coated with rubber paste, then executed with adhesive unvulcanized rubber sheet containing more sulfur amount than the rubber to be adhered, executed with other necessary member, and then vulcanized and connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for endless joining a conveyor belt using an organic fiber such as nylon, polyester, vinylon or aramid as a core reinforcing layer.

[0002]

2. Description of the Related Art When a conveyor belt is endlessly joined by thermal vulcanization, a cover rubber and a reinforcing layer coated with rubber on the upper and lower surfaces are cut to a predetermined size at the end of the belt and the step structure required for the joint is cut. obtain.
In this processing work, in order to peel off the cover rubber and the reinforcing layer, a knife or the like is used to make a cut only in the thickness of the cover rubber or only one layer of the reinforcing layer, and the peeling work is performed using this as a grip allowance. Work with a knife, etc.
It simply depends on the intuition of the operator, and if the knife blade goes deeply, it will damage even the lower layer of the layer originally to be cut off, and there is a great risk of reducing the belt strength.

In particular, a belt using aramid fiber as a reinforcing layer takes full strength of the belt with one aramid reinforcing layer without superposing the reinforcing layers. Therefore, if this is damaged, the belt will be cut early and will be fatal. .

In the case of performing the peeling work by grasping the gripping margin, the adhesive force between the respective layers is so strong that it cannot be done by hand, and the peeling work is gradually performed by using an instrument such as a winch. Since it is necessary to perform the removal, there is a problem that the installation of the device is complicated and the working time becomes long.

Further, since the rubber coated in advance is often broken and adhered to the spots on the surface of the reinforcing layer after being stripped off, the surface is smoothed and the adhesive contact area is increased. Therefore, buffing is usually performed,
Since this work also relies on the intuition of the operator, not only is the rubber on the surface of the reinforcing layer buffed, but the fiber layer itself may be damaged, and there is a great risk of reducing the belt strength. Further, it is difficult to completely remove the buff powder generated by the buffing process, and thus it is difficult to obtain perfect adhesion.

[0006]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention As a result of eliminating the above-mentioned problems, the present inventors have made earnest studies on an easier and more complete bonding method, and as a result, a method for solving these problems. The inventors have found the present invention and have reached the present invention.

[0007]

[Means for Solving the Problems] That is, when endlessly joining a conveyor belt using an organic fiber as a core reinforcing layer as described in claim 1, at least a portion to be bonded later is vulcanized in advance. Before carrying out vulcanization after sandwiching a canvas that has unevenness on at least one side and easy to peel off from the vulcanized rubber on the surface of the bonded part, then immediately before bonding the part The conveyor belt joining method is characterized by peeling off and adhering the relevant portions with an adhesive.

Further, as described in claim 2, in the case of endless joining of the conveyor belt using the organic fiber as the core reinforcing layer, at least the portion to be bonded later is not vulcanized in advance, but the portion to be bonded is preliminarily vulcanized. On the surface, vulcanize after sandwiching a canvas that has unevenness on at least one side and that can be easily peeled off from the vulcanized rubber, then peel off the canvas immediately before adhering that part and remove the corresponding part. A method for joining conveyor belts, characterized by vulcanizing and adhering using an adhesive rubber, and further, as described in claim 3.
In the case where the conveyor belt is endlessly joined, as an adhesive rubber, an unvulcanized rubber having a sulfur content of 1 to 3 PHR larger than that of a vulcanized rubber to be adhered is sandwiched and vulcanized and adhered. The conveyor belt joining method according to claim 2, wherein

The first aspect of the present invention is to clean at least the surface of the vulcanized rubber portion to be adhered and to make the surface of the vulcanized rubber portion uneven, at least one side of the surface of the bonded portion is vulcanized before vulcanization. A canvas or the like that is easily peeled off from the rubber after vulcanization, for example, _RY is 1 to 5000 μm, preferably 20.
Vulcanization is performed after sandwiching a canvas of about 200 μm. Then, after vulcanization, immediately before adhesion, the canvas is peeled off from the rubber. By doing this, it is possible to eliminate the knife work to peel off the cover rubber and the reinforcing layer,
There is no risk of damaging the reinforcement layer, and the peeling work can be done easily by hand without the need for tools. Furthermore, the rubber surface from which the canvas is peeled off is an uneven surface just like when buffed. It is easy to obtain a surface suitable for adhesion, which has
The R _Y means the maximum height of the unevenness defined in JIS-B0601 “Definition and display of surface roughness”.

The above-mentioned canvas which is easily peeled off from the vulcanized rubber means that when a material such as canvas embedded in unvulcanized rubber is integrally vulcanized, the material in the vulcanized rubber is easily The material embedded in the rubber is not particularly limited as long as it can be separated from the vulcanized rubber, but it is necessary that the material embedded in the rubber is a material that can sufficiently withstand the vulcanization temperature or time of the rubber,
More preferably, a material that, when peeled off from this material, exhibits the same unevenness as the surface of the rubber is just buffed, and from this point, ox canvas or the like is preferably used.

According to a second aspect of the present invention, as in claim 3, between the vulcanized rubber / vulcanized rubber or the vulcanized rubber / unvulcanized rubber adhered to each other, the sulfur content is 1 to 1 more than that of the vulcanized rubber. An unvulcanized rubber (adhesive rubber) with a large amount of 3 PHR was prepared, and vulcanization adhesion was performed after sandwiching it between the adhesive surfaces of both, so that migration of the above-mentioned crosslinking agent was minimized. The strength of the bonded portion can be further improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The first point of the present invention is to vulcanize by first embedding a canvas which is easy to separate from the vulcanized rubber on at least the surface of the portion to be bonded later. After that, by peeling off the embedded canvas (1) There is no need to use the conventional knife work, so there is no risk of damaging the reinforcing layer that is responsible for the belt strength, and (2) Use the winch or other equipment that has been used conventionally. You can easily perform peeling work in a short time without any manual work. (3) By using the release surface of the canvas instead of the conventional buffing, it is easier and easier to apply to the vulcanized rubber surface to be bonded later. In addition, an appropriate unevenness (anchor effect) can be obtained, and the adhesive surface can be obtained as a clean surface.

A second point of the present invention is to bond a vulcanized rubber / vulcanized rubber or a vulcanized rubber / unvulcanized rubber which adhere to each other with a sulfur content of 1 to 3 PHR more than the vulcanized rubber. It is characterized in that an unvulcanized rubber sheet is prepared and vulcanized and bonded by sandwiching the unvulcanized rubber sheet. If the sulfur content of the unvulcanized rubber for adhesion is equal to or less than that, the unvulcanized rubber sheet is vulcanized. The transfer of sulfur to the vulcanized rubber causes a decrease in elastic modulus and the like, resulting in a decrease in adhesive strength. However, if the difference in the amount of sulfur is larger than this, the physical properties of the adhesive rubber itself are deteriorated and the adhesive strength is decreased.

[0014]

EXAMPLES The present invention will now be described with reference to examples, but the present invention is of course not limited to these examples. [Example 1] Width of 1050 mm, top cover rubber, bottom cover rubber, one layer of aramid reinforcing layer coated with thin rubber on the upper and lower surfaces, and nylon with upper and lower surfaces coated with thin rubber on the upper and lower surfaces of the aramid reinforcing layer When molding a conveyor belt in which one layer of each breaker is laminated, at least a portion to be bonded later, that is, a portion to be bonded is made of polyester "Ox canvas" (250D / 1 (2
03 pieces / 5 cm) x 250D / 2 (122 pieces / 5c)
m)) was sandwiched and then vulcanized. (Fig. 1) After vulcanization, just before adhesion, peel off the canvas (Fig. 2), apply rubber glue on the surface, and then apply an unvulcanized rubber sheet for adhesion with a sulfur content of 1 PHR higher than the rubber to be adhered. , And other necessary members were vulcanized and bonded.

Example 2 A belt was obtained in the same manner as in Example 1 except that 3 layers of polyester reinforcing layer were used instead of 1 layer of aramid reinforcing layer and 2 layers of nylon breaker. .

[Comparative Example 1] A belt was obtained in the same manner as in Example 1 except that the polyester canvas (Ox canvas) was not used and the adhesive surface was buffed.

[Comparative Example 2] A belt was obtained in the same manner as in Example 2 except that the polyester canvas (ox canvas) was not used in Example 2 except that the adhesive surface was buffed.

In the endless joining work of the belts obtained in the above Examples and Comparative Examples, the peeling force required for peeling the reinforcing layer to obtain the step structure and the work for taking out the core reinforcing layer are started. Table 1 shows the time required to complete the step structure.

[0019]

[Table 1]

[0020]

As described above in detail, by burying the ox canvas, which is easily peeled off from the vulcanized rubber, in the portion to be joined in advance, it can be peeled off instantly with a slight force, In addition, the risk of damage to the core reinforcing layer due to knife work could be eliminated. At the same time, the need for buffing was eliminated, and the time required to complete the stepped structure of the core reinforcing layer was greatly reduced.

[Brief description of drawings]

FIG. 1 is a canvas 5 according to the present invention, which is easily peeled off at a portion which is to be peeled off later to be an adhesive portion when a laminated conveyor is molded.
It is an example of a cross-sectional view showing a state of sandwiching.

FIG. 2 is a cross-sectional view showing a state in which the canvas is peeled off after being vulcanized according to the present invention.

FIG. 3 shows an example of a cross-sectional view showing the structure when the canvas is peeled off according to the present invention and then joined to each other via the adhesive unvulcanized rubber 6.

[Explanation of symbols]

 1 Top cover rubber 2 Bottom cover rubber 3 Aramid reinforcement layer 4 Breaker 5 Ox canvas 5a Ox canvas release surface 6 Adhesive rubber sheet

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B29K 21:00 105: 24 B29L 29:00

Claims (3)

[Claims] 1. When endlessly joining a conveyor belt using an organic fiber as a core reinforcing layer, at least one surface of the bonded portion has unevenness before being vulcanized in advance to a portion to be bonded later. In addition, vulcanization is performed after sandwiching a canvas that can be easily peeled off from the vulcanized rubber, and then immediately before bonding the part, peel off the canvas and bond the corresponding part with an adhesive. Characteristic conveyor belt joining method. 2. When endlessly joining a conveyor belt using an organic fiber as a core reinforcing layer, at least one surface of the bonded portion has unevenness before being vulcanized at least at a portion to be bonded later. Moreover, vulcanization is performed after sandwiching a canvas that can be easily peeled off from the vulcanized rubber, and immediately after that part is peeled off and the vulcanized adhesive is adhered to the corresponding part using an adhesive rubber. The method of joining a belt conveyor belt according to claim 1, wherein 3. When the conveyor belt is endlessly joined, an unvulcanized rubber having a sulfur content of 1 to 3 PHR more than that of the vulcanized rubber to be adhered is sandwiched as an adhesive rubber, and the adhered portion is vulcanized. 3. The method for joining conveyor belts according to claim 2, wherein the bonding is performed by bonding.