JPH0542754A - Transfer of mark to belt sleeve - Google Patents

Abstract

PURPOSE:To transfer a mark to a belt sleeve in order to flatly finish the rear of a belt by eliminating the difference in level between a mark transfer region and a mark non-transfer region. CONSTITUTION:A transfer mark material 1 wherein a mark 3 is bonded to a base material 1 and rubber canvas 4 are superposed one upon nother so that the mark 3 is opposed to the rubber canvas 4 to be pressed under heating and the base material 2 is peeled off to transfer the mark 3 to the canvas 4. This canvas 4 is applied to a molding drum so as to be positioned on the innermost or outermost side of the drum and a rubber layer and core wires are combined to be laminated to the canvas 4 to be integrally vulcanized along with the canvas 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring a mark to a belt sleeve, and more particularly to a method for transferring a mark to a belt sleeve such as a multi-ribbed belt, a toothed belt or a V belt.

[0002]

2. Description of the Related Art As a method of printing a mark on the back surface of a conventional power transmission belt, a transfer mark in which an unvulcanized color rubber to be the mark is attached on a base material made of a transparent synthetic resin film is used. , After sticking to the molding drum, fit the rubber covered canvas, wrap the stretched rubber layer, the core wire and the compressed rubber layer, then fit the jacket and vulcanize, and transfer from the vulcanized belt sleeve. By peeling off the mark film, the mark was transferred to the surface of the rubber covered canvas. The multi-ribbed belt was obtained by polishing the compressed rubber layer of the belt sleeve thus obtained into a V-groove shape and cutting it into a predetermined width.

[0003]

However, during vulcanization, since the base material and the rubber of the transfer mark raised from the base material are pressed into the back surface of the belt sleeve, the back surface has a step difference after the base material is stripped off. The pattern was formed and the marked area was slightly depressed. That is, a step was formed on the back surface of the belt between the area where the mark was transferred and the area where the mark was not transferred, and the surface was not flat. The recent multi-ribbed belts are used for driving auxiliary equipment of automobiles, and especially, they are wound in a serpentine shape by multi-axis drive, and there is an uneven surface on the back surface of the belt for engaging a tensioner on the back surface. Said the tensioner was vibrating and making noise. Not only that, but even when driving the back surface of the belt using the back surface of the belt, there is a problem that noise when driving the belt increases.

The present invention solves such a problem, and provides a mark transfer method to a belt sleeve which eliminates a step between a mark transfer area and a non-transfer area on the back surface of the belt and finishes a flat surface. To aim.

[0005]

That is, in the mark transfer method for a belt sleeve according to the present invention, first, a transfer mark material having a mark attached to a base material and a canvas are placed so that the mark faces the canvas. After heating and pressing this, the base material is peeled off and the mark is transferred to the canvas, and the canvas, rubber layer and core wire are placed so that this mark is located on the innermost or outermost side of the molding drum. It is a method of integrally vulcanizing these by combining and laminating.

[0006]

When the transfer mark material and the canvas are piled up and heated and pressed as in the above method, the transferred mark is pressed into the depression formed by the warp and the weft, which is the opening of the canvas, and is relatively pressed. If you vulcanize by installing canvas so that it becomes a flat surface and position this mark on the innermost or outermost side of the molding drum, the mark will firmly adhere to the canvas and present a clear pattern, It has a flat surface by eliminating the step between the region having a mark and the region having no mark.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a transfer mark material used in the method of the present invention, and FIGS. 2 to 6 show steps of the method of the present invention. According to this, the transfer mark material 1 used in the method of the present invention is one in which the mark 3 is attached on the base material 2, and the base material 2 is made of nylon, polyester,
A transparent synthetic resin film such as acetate, or a release paper, usually having a thickness of about 0.01 to 0.1 mm,
It does not plasticize or shrink during vulcanization. It is obvious that the mark 3 is deformed when the base material 2 is thermoplasticized or heat-shrinked during vulcanization. Further, if the synthetic resin film is less than 0.01 mm, wrinkles occur in the transferred marks.

On the other hand, the mark 3 is usually an unvulcanized color rubber composition, for example, rubber such as NR, CR or SBR, and a vulcanizing agent,
A resin composition containing a vulcanization aid, a pigment, or the like, or a resin composition.

As in the marking step shown in FIG. 2, the transfer mark material 1 is placed on an unvulcanized rubber cloth 4 which is endless with a stepless joint such as a sewing machine or heat fusion, and is laminated on the bottom. It is installed on the press plate 5 so that the mark 3 faces the canvas 4. And this superposed product is 100 to 140 ° C, preferably 120 to 1
10 to 30 seconds at 30 ° C, preferably 15 to 25 seconds,
The mark 3 is transferred to the canvas 4 by sandwiching it with the upper and lower press plates 6 and 5 at 2.0 to 3.0 kg / cm ² and applying heat and pressure. In this heating and pressing step, the rubber attached to the mark 3 and the canvas 4 is in an unvulcanized state. When the canvas 4 is pressed under heating, the warp and the weft are displaced and the mark 3 is pressed into the recess formed between the yarns and presents a relatively flat surface.

The canvas 4 is, for example, a plain weave or a twill weave made of cotton, nylon, polyester, vinylon or the like, and is preferably a stretchable canvas having a crossing angle between the warp and the weft of 90 to 150 °, which has not been added yet. Sulfur rubber is friction-coated or coated.

The marking process of the present invention is not limited to the method of transferring the mark 3 to the endless canvas 4 and, for example, as shown in FIG.
After rubbing the unvulcanized rubber on the canvas 4 with 5 to make friction, the transfer mark material 1 is superposed on the canvas 4 and is sandwiched between the upper and lower press plates 6 and 5, and the mark 3 is heated and pressed under the same conditions as described above. Can also be transferred to the canvas 4. During this heating and pressurization, the canvas 4 is given a constant tension by the movement of the tension rolls 17 located between the guide rolls 16 and 16. The canvas 4 obtained by this method is cut into a predetermined length and then made endless.

Further, in the marking step of the present invention, as shown in FIG. 4, after the unvulcanized rubber is rubbed against the canvas 4 to cause friction, the canvas 4 is cut into a predetermined length, Is placed on the lower press plate 5, the transfer mark material 1 is placed so that the mark 3 faces the canvas 4, sandwiched between the upper and lower press plates 6 and 5, and heated and pressed under the same conditions as described above, and the mark 3 is printed on the canvas. 4 can also be transferred. After the transfer, this canvas 4 is made endless. Of course, the marking of the present invention can be performed not only by friction but also after the coating, soaking, spreading, cutting and winding steps and before the canvas 4 is made endless.

When this is completed, the base material 2 is peeled off, the endless canvas 4 is fitted into the forming drum 7, and at least N
A stretched rubber layer 8 made of a rubber selected from R, SBR, CR and the like is wrapped around, and a core wire 9 made of polyester fiber and aramid fiber cord is spirally spun, and the same rubber as the stretched rubber layer 8 is nylon, The compression rubber layer 10 in which short fibers such as polyester and aramid fibers are arranged in the width direction is wound, and the molding is finished. After that,
The molding drum 7 is placed in a vulcanizing can by a usual method to vulcanize the belt sleeve 11. During the vulcanization, the transferred mark 3 is pressed by the forming drum 6 and partially penetrates into the depression of the canvas 4, and becomes the same surface as the area without the mark, and becomes a flat surface without a step.

The above-mentioned molding method is reverse molding, but may be normal molding. That is, the compression rubber layer 10 is formed on the molding drum 7,
The core wire 9, the stretched rubber layer 8 and the canvas 4 may be laminated. In this case, the mark 3 in close contact with the canvas 4 is located on the outermost side of the forming drum 7.

The vulcanized belt sleeve 11 thus obtained is extracted from the molding drum. When the multi-ribbed belt 12 as shown in FIG. 7 is formed, the reversely formed belt sleeve is ground into a plurality of V-shaped grooves by using a grinder equipped with a plurality of annular V-shaped grooved grindstones. After doing
Cut to a specified width and finish into individual belts. When forming a low-edge belt, a belt sleeve that has been positively formed is cut into a V-shaped cross section using a cutting machine.

FIG. 7 is a partial cross-sectional perspective view of a multi-ribbed belt obtained by using the method of the present invention, in which the multi-ribbed belt 12 has a stretched rubber layer 8 and polyester fibers and aramid fibers embedded in this layer. A compressed rubber layer 10 having a core wire 9 made of a cord and a plurality of V-shaped grooves 13 extending in the circumferential direction of the belt is provided on the lower surface, and a short material such as nylon, polyester, aramid or cotton is formed in the compressed rubber layer 10. The fibers are arranged in the belt width direction. On the back surface 14 of the belt, there is no step at the boundary between the area with the mark 3 and the area without the mark 3, and the surface is extremely flat. Even when the tension pulley engages with the back surface 14, the belt does not smoothly rotate and vibrate.
Resonance noise is also reduced.

[0018]

As described above, according to the method of the present invention, after the canvas and the transfer mark material are superposed on each other, they are heated and pressed to transfer the mark of the transfer mark material into the depression of the canvas, By vulcanizing this canvas at the innermost or outermost side of the forming drum, a flat surface having no step is formed between the area having the mark and the other area, and the mark is the rubber of the cloth. It firmly bonds with and exhibits a clear pattern.

[Brief description of drawings]

FIG. 1 is a perspective view of a transfer mark material used in the present invention.

FIG. 2 is a diagram showing a step of superposing a transfer mark material and a canvas and heating and pressing the same in the marking step of the present invention.

FIG. 3 is a diagram showing another marking process of the present invention.

FIG. 4 is a diagram showing still another marking step of the present invention.

FIG. 5 is a diagram showing a step of inserting the canvas on the forming drum, which is a step of the present invention.

FIG. 6 is a cross-sectional view when a belt sleeve is molded on a molding drum in the process of the present invention.

FIG. 7 is a partial cross-sectional perspective view of a multi-ribbed belt obtained by using the method of the present invention.

[Explanation of symbols]

 1 Transfer Mark Material 2 Base Material 3 Mark 4 Canvas 7 Molding Drum 8 Stretching Rubber Layer 9 Core Wire 10 Compression Rubber Layer

Claims (2)

[Claims] 1. A transfer mark material having a mark adhered on a base material and a canvas are superposed so that the mark faces the canvas, and after heating and pressurizing the base material, the base material is peeled off to form the mark. The belt is characterized in that the canvas, the rubber layer, and the core wire are combined and laminated so that the mark is located on the innermost or outermost side of the forming drum, and these are integrally vulcanized. Mark transfer method to sleeve. 2. The method for transferring a mark to a belt sleeve according to claim 1, wherein unvulcanized rubber is attached to the canvas before the mark is transferred.