JP2686738B2 - Conveyor belt - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a conveyor belt, and more specifically, when performing endless processing of a conveyor belt, it is possible to facilitate the peeling work of the end portion and improve the endless processing workability. The present invention relates to a conveyor belt. [Prior Art] Conventionally, an aromatic polyamide fiber or wholly aromatic polyester fiber coated with a coat rubber 1a as shown in FIG.
When the belt-shaped belt A constituted by integrally bonding the lower cover rubber 3 and the lower surface cover rubber 3 is formed into an endless shape having a predetermined length, the cover rubber at each end of the belt is peeled by a predetermined length. Then, the cover rubber is placed again on the stripped portion in the state where the end portions are abutted or overlapped with each other, and vulcanization is performed in this state to integrally configure. By the way, a belt having a one-ply or two-ply structure using a conventional aromatic polyamide fiber (trade name: Kevlar yarn) or wholly aromatic polyester fiber (Kuraray Co., Ltd .: trade name, Vectran) as a core is Tensile strength 1000kg
In the case of f / cm belt, in order to achieve high joining strength and bending fatigue resistance, use a coated rubber with high adhesive strength (50 kgf / 25 mm or more) and high tearing force (70 kgf / cm or more). I'm using it. However, since the coated rubber having high adhesive strength and high tear strength is used as described above, the following problems occur. (A) Use of a winch or the like is indispensable in the endlessly peeling work of the cover rubber, and cutting of the cover rubber occurs, resulting in poor workability and a great amount of time. (B) When the cover rubber is peeled off, the core body 1 is deformed, and in the case of a canvas, a portion which is not bonded to the rubber is exposed due to a shift of the weft thread or the like. (C) The core body is easily scratched by a knife when peeling off the cover rubber and raising it, and a sander when buffing the residual rubber. (D) A cover rubber having high physical properties (tensile strength, tearing force) is used to avoid the cover rubber being broken, resulting in an increase in cost. [Object of the Invention] The present invention has been devised by focusing on such conventional problems, and an object of the present invention is to easily remove a cover rubber of a terminal portion when endless processing a conveyor belt. The present invention provides a conveyor belt that facilitates the joining work of the belts and improves the joining workability. [Constitution of the Invention] In order to achieve the above object, the present invention uses an aromatic polyamide fiber or wholly aromatic polyester fiber as a core,
Adhesive strength of 50 kgf / 25 mm or more, tearing force of 70 kg
In a conveyor belt configured by integrally bonding a top cover rubber and a bottom cover rubber through a coat rubber of f / cm or more, a top side coat rubber and a top side cover rubber and a bottom side coat rubber and a bottom face. A peeling rubber layer having a tearing force of 50 kg · f / cm or less is provided between the cover rubber and the cover rubber, and a woven fabric canvas is provided in the peeling rubber layer. Embodiments of the Invention Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 2 shows a cross-sectional view of a belt main body 11 embodying the present invention. The belt main body 11 has an aromatic polyamide fiber or wholly aromatic polyester fiber coated with a coat rubber 12 as a core body 13 and has upper and lower surfaces thereof. An upper surface cover rubber 14 and a lower surface cover rubber 15 are integrally bonded via a coating rubber 12 having an adhesive force of 50 kg · f / 25 mm or more and a tearing force of 70 kg · f / cm or more, respectively. Between the upper side coat rubber 12 and the upper side cover rubber 14 and the lower side coat rubber 12 and the lower side cover rubber 15 which coat the core body 13 of the aromatic polyamide fiber or the wholly aromatic polyester fiber, a peeling rubber layer 16a, respectively. , 16b are provided. Inside the peeling rubber layers 16a and 16b, canvas having a leno weave structure is provided. After peeling the cover rubber, the peeling rubber layers 16a, 16b remaining on the coat rubber 12 are completely removed by buffing with a sander or the like, and the peeling rubber layers 16a, 16b are provided to finish the surface smoothly. is there. The rubber of the peeling rubber layers 16a and 16b is the coated rubber 12
And the upper surface cover rubber 14 and the lower surface cover rubber 15 are sufficiently adhered.
The tearing force is 50 kgf / cm so that the rubber of
It is as follows. Further, the thickness of the peeling rubber layers 16a, 16b is preferably 0.1 to 1.0 mm, more preferably 0.3 to 0.6 mm. In addition, in Table 1, the peeling rubber layer 16 having a tearing force of 36 kgf / cm
An example of the difference in adhesive force between the case where only a and 16b are provided and the case where the canvas having a leno weave structure is provided in the peeling rubber layers 16a and 16b will be shown. Adhesive force is measured according to JIS-K-6322-1.
Followed by 988. It can be seen from Table 1 that by using a rubber having the same physical properties and by providing a canvas having a entangled weave structure in the peeling rubber layer, the adhesive force is lowered as compared with the case where the peeling rubber layer composed of only rubber is provided. I see that you can. (Effects of the Invention) The present invention uses the aromatic polyamide fiber or wholly aromatic polyester fiber as the core as described above, and the upper and lower surfaces thereof have an adhesive force of 50 kg / f / 25 mm or more and a tear force of 70 kg / f / cm or more. In the conveyor belt configured by integrally bonding the upper surface cover rubber and the lower surface cover rubber through the above-mentioned coated rubber, the upper surface side coated rubber and the upper surface side covered rubber, and the lower surface side coated rubber and the lower surface side covered rubber. Between,
Since a peeling rubber layer having a tearing force of 50 kg · f / cm or less is provided, and a canvas having a entangled weave structure is provided in the peeling rubber layer, the following excellent effects are exhibited. (A) Adhesive force of 50kgf / 25cm or more, tear force of 70kgf / cm
Since the peeling rubber is provided between the raised coat rubber and the upper and lower cover rubbers, cutting of the cover rubber can be avoided during endless cover peeling work at the end of the conveyor belt having high tensile strength. , The joining workability of the belt is remarkably improved, the work time can be greatly reduced (1/2 to 1/3) compared with the conventional one, and the work can be performed without using the winch or the like. (B) The tearing force of the coated rubber was increased to 70 kgf / cm or more, while the tearing force of the peeling rubber layer was lowered to 50 kgf / cm or less. The upper and lower cover rubbers can be separated from the coated rubber by cohesive failure that destroys the rubber of the layer itself, resulting in deformation of the core,
It is possible to avoid exposure of a portion of the core body that is not bonded to the rubber, and it is possible to store the core body without breaking the interface between the core body and the coated rubber. (C) It is possible to avoid scratching the core body with a scalpel or a sander. (D) The cover rubber may be made of a material suitable for its function, which is economical because unnecessary cost increase can be avoided. (E) By providing a woven fabric canvas in the release rubber layer, interfacial peeling occurs between the canvas and the rubber before the release rubber layer itself undergoes cohesive failure, and the part is initiated. As it can easily cause cohesive failure, the adhesive force can be reduced compared to the case where a peeling rubber layer made of only rubber is provided while using rubber having the same physical properties, and therefore the adhesive force is 50 kg. f /
In a conveyor belt with extremely high tensile strength using coated rubber with a height of 25 cm or more and a tearing force of 70 kgf / cm or more, ensure the rubber physical properties of the peeling rubber layer to maintain the original function of the conveyor belt. However, the adhesive force can be further reduced to facilitate the peeling work, thereby further improving workability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional conveyor belt, and FIG. 2 is a sectional view of the present invention. 11 …… Belt body, 12 …… Coat rubber, 13 …… Core body of aromatic polyamide fiber or wholly aromatic polyester fiber,
14 …… Top cover rubber, 15 …… Bottom cover rubber, 16a, 16
b …… Rubber layer for peeling.

Claims (1)

(57) [Claims] Aromatic polyamide fiber or wholly aromatic polyester fiber is used as the core, and the adhesive strength is 50kgf / 25cm on the upper and lower surfaces.
As described above, in the conveyor belt configured by integrally bonding the upper surface cover rubber and the lower surface cover rubber through the coating rubbers with the tearing force of 70 kgf / cm or more, the upper surface side cover rubber and the upper surface cover rubber are A tear force of 50 is applied between the underside coat rubber and the underside cover rubber.
A conveyor belt comprising a peeling rubber layer having a weight of not more than kg · f / cm, and a canvas having a entangled weave structure provided in the peeling rubber layer.