JPH0288238A - Connecting method of resin belt with uneven surface - Google Patents

Abstract

PURPOSE:To contrive to prevent perfectly the discontinuity of uneven pattern at connected part by a method in which unvulcanized heat resistant sheet of high molecular weight is brought in pressure contact with the surface of the resin belt with uneven surface, and reverse- type mold in projections and recesses is made by vulcanization, and then after the reverse-type mold has been brought in contact with the surface of both belts where the parts to be con nected of the resin belt are butted, they are pressurized and heated. CONSTITUTION:The resin belt 1 with uneven surface is the belt composed of the rubber 3 reinforced with low shrinkable woven cloth 2, and its surface has the unevenness 4 of stripe shape. If the stock forming the reverse-type pattern on the surface of a conveyer belt 1 is the high molecular weight compound capable of being vulcanized with the heat giving no effect to the resin belt, there is no limitation else. When this stock is pressed to the surface of the conveyer belt and is vulcanized under heating, the uneven pattern of the belt surface is reversely transferred onto the stock surface and mold fixing property is kept by the low shrinkable woven cloth of rear surface. The transfer mold 5 coincides with the belt mutually and is fitted thereinto without a gap by deforming the mold so as to be adapted to the uneven surface of the belt, when this reverse transfer mold is brought in pressure contact with the connected surface of the conveyer belt over the end surfaces of two belts butted mutually. At this state, if the part to be connected is heated and pressurized, the belts may be connected at the state where the uneven pattern is perfectly continued.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for joining resin belts having surface irregularities.

[Conventional technology]

Conventionally, resin conveyor belts having a laminated structure in which a resin layer made of a polymer is reinforced with a low-stretch canvas or the like have been widely used as lightweight conveyor belts.

Cholera condoms are generally produced in the form of long strips at factories, and are connected in endless strips at the site of use.

The above-mentioned conveyor belt may be provided with a surface stripe-like or grid-like uneven pattern for the purpose of improving the coefficient of friction with the conveyed article, and when joining the conveyor belt with such an uneven pattern, the above-mentioned horizontal It is necessary to join them with continuity.

[Problems with conventional technology]

However, it is very difficult to join the above-mentioned uneven pattern while providing continuity. For example, as shown in FIGS.
, B2 becomes discontinuous, and the characteristics at this part, such as the frictional resistance value, become discontinuous.Also, in an attempt to eliminate such defects, even if the steel plate is pressed against the joint and the steel plate is shaped, the steel plate remains unchanged. This has the drawback that a discontinuous portion occurs between the pressing portion C and the pattern, which increases the inconvenience.

[Problem to be solved by the invention]

In view of the above-mentioned drawbacks, the present invention has been made for the purpose of providing a method for joining resin belts having surface irregularities, which can completely prevent discontinuity of the uneven pattern at the connection part during on-site joining, and which is easy to install. be.

[Technology that led to solving the problem]

That is, in the method of joining a resin belt having an uneven surface according to the present invention, an unvulcanized polymeric heat-resistant sheet reinforced with a low-shrinkage woven fabric is pressed onto the surface of a resin belt having an uneven surface, and the unevenness is removed by vulcanization. Next, the concave-convex inverted mold is brought into contact with the abutting surfaces of both belts at the joint portion of the resin belt, and the resin belt is bonded and connected by applying pressure and heating. It is characterized by the fact that it can be removed.

[Effect]

The resin belt having surface irregularities of the present invention is a belt made of rubber or elastomer material 3 reinforced with a low-shrinkage woven fabric 2 as shown in FIG. ) and (b), it refers to a conveyor belt l with striped or grid-like unevenness 4.

In this invention, the material for forming the inverted uneven mold on the upper surface of the conveyor bell l-1 is not particularly limited as long as it is a polymeric compound that can be vulcanized by heat without affecting the resin belt, but the mold after molding is not particularly limited. In consideration of repeated use, etc., it is most preferable to use a silicone-based vulcanized rubber with a JIS hardness of 60' to 80'' after vulcanization, and a material with high mold releasability from the belt material to be joined.

When the above-mentioned material is pressed onto the surface of a conveyor belt and heated and vulcanized, the uneven pattern on the surface is reversely transferred to the surface of the material, and the regularity is maintained by the low-stretch woven fabric on the back surface. When the reverse transfer mold of the conveyor belt is pressed onto the joint surface of the conveyor belt by applying pressure to the 4 sides of the two butted bells F', the transfer mold has elasticity as mentioned above, so it will adapt to the unevenness of the belt surface. They deform and fit into each other without any gaps.

If the joint is heated and pressurized in this state, the uneven pattern becomes completely continuous and the belt is connected.

After cooling, the inverted mold is removed to complete the bonding.

Note that any joining means such as ramp joining and finger joining can be applied to belt joining in the above, and is not particularly limited.

〔Example〕

Next, the present invention will be explained in detail.

(Example 1) A conveyor belt l of 30c+m is prepared, as shown in FIGS. A natural rubber unvulcanized rubber sheet reinforced with polyester woven fabric was laid to cover the entire width, and heated at 160°C for 15 minutes while applying a pressure of 5 kg/c- to create a transfer mold. .

Next, lap bonding (
The transfer mold 5 is placed on the conveyor belt l which has been joined by Fig. 3 (a)) and the finger joint (Fig. 3 (b)), and after arranging the concave and convex strips to fit each other by visual measurement, the joining condition 150 is applied.
'C1 pressurization was performed at 3 kg/cJ for 10 minutes.

This resulted in a joint with no discernible seam.

(Example 2) JIS hardness 60°~ after curing as rubber material for transfer mold
When belt joining was performed in the same manner as in Example 1 using 80° silicone vulcanized rubber, results exactly the same as in Example 1 were obtained.

(Example 3) Using the transfer molds obtained in Example 1 and Example 2, a repeated bonding test was conducted on the same type of belt, and in the case of Example 1, the transfer mold became sagging after the 6th time, and it was completely broken. However, in Example 2, a completely continuous uneven pattern was obtained even after repeating 100 times or more.

Next, the spliced belts obtained in Examples 1 to 3 were attached to a pulley with a diameter of 25 m.
mφ head, wrapped around the tail pulley, 200m/mi
We carried out running tests under high speed conditions and forward and reverse driving under the same conditions to test the joint strength and surface friction resistance of joints, but there were no accidents such as cutting at joints or slipping of transported objects. It didn't happen at all.

〔effect〕

As explained above, this invention uses a soft mold when joining belts, and the irregularities on the surface of this mold are made to conform to the irregular surfaces on the belt surface, and the belt surface is softened and joined after joining. The resulting concavo-convex pattern can be made continuous between completely joined belts, and has the effect of allowing the belt to run even under harsh conditions that could not be predicted in the past.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of a resin belt with surface irregularities, Figure 2
Figures (A) and (B) are plan views showing the surface condition of the resin belt, Figures 3 (A) and (B) are side sectional views showing the process of this invention, and Figures 4 (A) and (B). is a plan view of a conventional example. V; 7m? : Tokoro n! M4: eheytigaill-(El

Claims (1)

[Claims] (1) Press an unvulcanized polymeric heat-resistant sheet reinforced with a low-shrinkage woven fabric onto the surface of a resin belt having surface irregularities, create an inverted shape of the irregularities by vulcanization, and then join the resin belt. A resin having a surface unevenness, characterized in that the unevenness reversal mold is brought into contact with the surfaces of both belts that are butted against each other, and the resin belt is bonded and connected by applying pressure and heating, and then the unevenness reversal mold is removed. How to join the belt.