JPH07119062B2 - Method for joining resin belts having surface irregularities - Google Patents

Description

The present invention relates to a method for joining resin belts having surface irregularities.

[Conventional technology]

2. Description of the Related Art Conventionally, resin conveyor belts having a laminated structure in which a resin layer made of a polymer is reinforced with a low elastic canvas or the like have been widely used mainly as a lightweight conveyor belt.

Generally, these conveyor belts are produced in a long strip shape at a factory, and are usually connected and used endlessly at the site of use.

The 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 the above pattern is used for joining the conveyor belt having such an uneven pattern. It is necessary to join them with the continuity of.

[Problems of conventional technology]

However, it is very difficult to join while imparting the continuity of the above-mentioned concavo-convex pattern. For example, as shown in FIGS. B
2 becomes discontinuous, the characteristics in this part, for example, the frictional resistance value becomes discontinuous, and in order to eliminate such a defect, the shape steel sheet is pressed against the joint portion A, and shaping is performed. There is a defect that a discontinuity between the pressing portion C and the pattern is generated, which rather increases the inconvenience.

[Problems to be Solved by the Invention]

In view of the above-mentioned drawbacks, the present invention has been made with the object of providing a method for joining resin belts having surface asperities that can completely prevent discontinuity of the uneven pattern at the connection portion in the field joining, and that is also easy to apply. is there.

[Technology that has solved the problem]

That is, the method of joining a resin belt having surface irregularities of the present invention is such that an unvulcanized polymer heat-resistant sheet reinforced with a low-shrink woven fabric is pressure-welded to the surface of a resin belt having surface irregularities, and the irregularities are formed by vulcanization. After making the reversing mold, the concavo-convex reversing mold is brought into contact with both belt surfaces of the joint portion of the resin belt butted against each other, and the resin belt is adhered and connected by pressurizing and heating. It is characterized by removing the.

[Action]

The resin belt having surface irregularities according to the present invention is a belt made of a rubber or elastomer material 3 reinforced with a low shrinkage woven fabric 2 as shown in FIG. ) And (b), the conveyor belt 1 is provided with stripe-shaped or grid-shaped irregularities 4.

In the present invention, the material for forming the concavo-convex inversion mold on the surface of the conveyor belt 1 is not particularly limited as long as it is a polymer compound that can be vulcanized by heat without affecting the above-mentioned resin belt, but it is possible to repeat the mold after molding. Considering the use, etc., the JIS hardness after vulcanization with a silicone vulcanized rubber is 60 ° to 80 °, and the belt material to be joined and the material having high releasability are most preferable.

When the material is pressed against the surface of the conveyor belt and heated and vulcanized, the uneven pattern on the surface is reverse-transferred to the surface of the material, and the regularity is maintained by the low-elasticity woven cloth on the back surface. When this reverse transfer mold is pressed against the end faces of the two abutted belts together on the joint surface of the conveyor belt, the transfer mold has elasticity as described above, so that it deforms so as to conform to the unevenness of the belt surface and becomes Fit and fit together without any gaps.

If the joint is heated and pressed in this state, the concavo-convex pattern becomes completely continuous and the belts are connected.

Then, after cooling, if the inverted mold is removed, the joining is completed.

In the above, any joining means such as lap joining and finger joining can be applied to the belt joining, and is not particularly limited.

[Embodiment] Next, an embodiment of the present invention will be described.

(Example 1) Fig. 2 (a) and (b) in which the pitch interval of the uneven strips was 3 mm.
A conveyor belt 1 having a width of 30 cm shown in Fig. 1 is prepared, and a natural rubber unvulcanized rubber sheet reinforced with a polyester woven cloth having low heat shrinkability is laid on the conveyor belt 1 so as to cover the entire width, and 5 kg / While applying pressure of cm ² at 160 ℃
A transfer mold was prepared by heating for 15 minutes.

Next, as shown in FIGS. 3 (a) and 3 (b), the transfer mold 5 is placed on the conveyor belt 1 joined by lap joining (FIG. 3 (a)) and finger joining (same as (b)). Then, after arranging so that the concavo-convex stripes fit with each other by visual inspection, the joining condition is 150 ° C,
Bonding was performed at a pressure of 3 kg / cm ^{2 for} 10 minutes.

As a result, a joint with no visible seams was formed.

(Example 2) JIS hardness 60 ° to 80 ° after curing as a rubber material for a transfer mold
When belt bonding was performed in the same manner as in Example 1 using the above silicone-based vulcanized rubber, completely the same results as in Example 1 were obtained.

(Example 3) Using the transfer molds obtained in Examples 1 and 2, a repeated bonding test was carried out on the same type of belt. It was impossible to apply a continuous uneven pattern to the joint, but in Example 2, a completely continuous uneven pattern was obtained even after repeating 100 times or more.

Next, the joining belt obtained in Examples 1 to 3 was used with a pulley diameter of 25 mmφ.
It was wound around the head and tail pulley of No. 2, and the running test under the high speed condition of 200 m / min and the joint strength and surface friction resistance test of the joint were performed under the same condition. No accidents such as cutting or slipping of the cargo occurred.

〔effect〕

As described above, according to the present invention, a soft mold is used at the time of joining the belt, and the unevenness of the mold surface is made to conform to the uneven surface provided on the belt surface so that the belt surface is softened and joined. The formed uneven pattern has the effect that the belts that are completely joined can be made to be continuous, and the belts can be run even under severe conditions that could not be expected in the past.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a resin belt having surface irregularities,
Figures (a) and (b) are plan views showing the surface condition of the resin belt, FIGS. 3 (a) and (b) are side sectional views showing the steps of the present invention, and FIGS. 4 (a) and (b). [FIG. 6] is a plan view of a conventional example.

Claims (1)

[Claims] 1. A non-vulcanized polymer heat-resistant sheet reinforced with a low-shrink woven fabric is pressed onto the surface of a resin belt having surface irregularities to form a reversal type of the irregularities by vulcanization, and then the resin belt. The surface irregularities characterized by removing the irregularity reversing mold after contacting the concavo-convex reversing mold on the surfaces of the joined parts of the joint, and bonding and connecting the resin belt by applying pressure and heat. A method for joining resin belts having the same.