JPS6362564A - Lettered and patterned rubber product and its production - Google Patents

Abstract

PURPOSE:To produce the title product having excellent flexibility and wear resistance by vulcanizing and bonding a lettering and patterning material provided with unvulcanized letters, etc., on one face of the sheet material to the surface of a vulcanized rubber product with the unvulcanized letters, etc., on the inside. CONSTITUTION:The lettering and patterning material provided with unvulcanized letters and a patterning layer 21 on one face of the sheet material 20 is vulcanized and bonded to the surface of the vulcanized rubber product 1 with the unvulcanized letters and the patterning layer 21 on the inside, and the sheet material 20 is then released. Consequently, a clearly lettered and patterned rubber product having excellent flexibility and wear resistance can be produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rubber product with characters and patterns formed thereon and a method for manufacturing the same. More specifically, the present invention relates to a rubber product in which clear characters and patterns are formed on the surface of a vulcanized rubber product, and a method for manufacturing the same.

[Prior Art] With conventional techniques, it is extremely difficult to form clear colored characters, colored patterns, etc. on the surface of rubber products. This is because rubber products undergo a vulcanization process that involves chemical changes.

Conventional methods for forming characters, patterns, etc. on the surface of rubber products include the following four methods.

(1) A method of vulcanizing a rubber sheet with letters or patterns on the surface of an unvulcanized rubber product.

This method has the disadvantage that the patterned letters and patterned rubber sheet move and deform due to plastic flow during vulcanization, and furthermore, the pattern is unclear.

(2) A method of punching letters or pattern-shaped holes in a vulcanized rubber product, filling the holes with colored unvulcanized rubber, vulcanizing it, and bonding it.

In this method, the work of filling the colored unvulcanized rubber is troublesome, and furthermore, the colored unvulcanized rubber comes out during heat vulcanization, causing the characters and patterns to collapse.

(3) A method of vulcanizing a film with letters or patterns along the surface of an unvulcanized rubber body.

In this method, it is inevitable that the colored character pattern moves and deforms during vulcanization, and furthermore, it is unclear.

(4) A method of adhering a rubber sheet or film with letters or patterns to the surface of a vulcanized rubber product using a room-temperature vulcanizing adhesive or the like.

This method adheres to the surface of vulcanized rubber products at room temperature,
Clear characters and patterns can be obtained, but adhesion failure is likely to occur.

Particularly in locations subject to repeated dynamic bending and wear, such as escalator handrails and tires, there is a problem in that letters and patterns may fail to peel off at an early stage.

As is clear from the above, in the conventional method of attaching a rubber sheet with letters or patterns to the surface of an unvulcanized rubber body and curing it, the letters or patterns may move or deform, or the edges may not be formed. In addition, the characters and patterns obtained were of poor clarity.

There is also a method of applying letters or patterns to the surface of the rubber body using colored paint, but this method has drawbacks in terms of bending resistance, abrasion resistance, and adhesion.

[Problems to be Solved by the Invention] The present invention has been made based on the above points, and its purpose is to eliminate the drawbacks of the prior art described above, and to provide a clear and sharp image on the surface of rubber products. An object of the present invention is to provide character and pattern forming rubber products with excellent bending resistance and abrasion resistance, and a method for producing the same.

[Means for Solving the Problems] The gist of the present invention is (1) on the surface of a vulcanized rubber product, characters in which unvulcanized characters and a pattern-forming rubber layer are provided on one side of a sheet material; Characters and pattern-forming rubber products obtained by vulcanizing and adhering the pattern-forming material to the unvulcanized characters and the pattern-forming rubber layer with the pattern-forming rubber layer on the inside, and peeling off the sheet material; (2) the sheet material; Characters and pattern-forming materials having unvulcanized characters and a pattern-forming rubber layer on one side are cut into characters and pattern bodies of a predetermined shape, and the characters and pattern bodies are coated with the unvulcanized characters and pattern-forming rubber layer. There are two points in the method for manufacturing a rubber product forming characters and patterns, which is characterized by vulcanizing and adhering the sheet material to the surface of the vulcanized rubber product so that it becomes the inner side, and then peeling off the sheet material.

In the present invention, the sheet material is preferably one that can form an unvulcanized rubber layer, does not melt or deform during heating and vulcanization, and can be peeled off after being vulcanized and adhered to the surface of the vulcanized rubber product. , for example, heat-resistant polymer films, reinforced plastic sheets, metal foils, ceramic sheets, etc.

In the present invention, the thickness of the sheet material is not particularly limited, but 0.002
~0.15m+a is good.

Heat-resistant polymer films include polyester films,
Examples include polycarbonate film, polyamide film, polysulfone film, polyimide film, polyimide film, polyamide-imide film, fluororesin film, silicone resin film, and the like. Examples of reinforced plastic sheets include glass fiber reinforced unsaturated polyester sheets and synthetic fiber reinforced unsaturated polyester sheets.

Examples of metal foil include aluminum foil, copper foil, tin foil, and stainless steel foil. Note that the sheet material may be an appropriate combination of two or more of these.

In the present invention, the unvulcanized character and pattern forming rubber layer provided on the sheet material is a thin unvulcanized rubber layer or a semi-cured rubber layer, and the thickness is such that it can display characters, patterns, etc. For example, it is about 0.005 to 1.2 ωm.

This unvulcanized character/pattern forming rubber layer can be colored to form characters, patterns, etc., such as red, yellow, blue, and green.

It is desirable that the color is white, gray, black, gold, silver, etc.

Methods for providing the unvulcanized characters and pattern-forming rubber layer on the sheet material include applying rubber paint, spraying rubber paint, pressing a thin unvulcanized rubber layer, and other methods. be able to.

Cutting methods for the character and pattern forming material include cutting, punching, and other methods, and are not particularly limited.

After vulcanizing and adhering to the surface of a vulcanized rubber product so that the unvulcanized rubber layer of the letters or patterns is on the inside, the sheet material is peeled off to expose the letters or patterns and make them clear. This is to make it look like this. For this reason, in the resulting rubber product with characters and patterns formed thereon, the portions where characters and patterns are formed are recessed by the thickness of the sheet material. These depressions have the effect of increasing the depth of letters, patterns, etc.

Note that transparent resin or transparent rubber can also be embedded in the recessed portion. Examples of the transparent resin include polyurethane resin and polystyl resin.

Examples of transparent rubber include pure silicone rubber, pure chlorosulfonated polyethylene rubber, and polyurethane rubber.

The conditions for vulcanizing and adhering the vulcanized rubber product to the surface of the vulcanized rubber product so that the unvulcanized rubber layer of the letters or patterns are on the inside are not particularly limited. Moreover, the conditions are good for vulcanizing and adhering the unvulcanized rubber layer of the letters or patterns. Such conditions include applying the pattern forming material to a predetermined location on the surface of the vulcanized rubber product with the unvulcanized rubber layer facing inside, and then applying the pattern forming material to a predetermined location on the surface of the vulcanized rubber product. Temporarily adhere by pressing from the top.

The hand electric heat press temperature may be about 60 to 180℃, but
Desirably, the temperature is best from 120 to 130°C.

After temporary adhesion, it is placed in a vulcanization mold preheated to 20-70℃, pressurized to 30-150kg/c-, and vulcanized and bonded at a vulcanization mold temperature of 120-180℃ for 30-40 minutes. do.

In the present invention, the vulcanized rubber product may be of any kind, such as handrails, hoses, seats, tires, balls, rubber insulated wires, anti-vibration rubber, and the like. Here, the degree of vulcanization of the vulcanized rubber product is semi-cured or higher, which does not deform when vulcanized and adhered to the surface of the vulcanized rubber product with the unvulcanized rubber layer of the letters or patterns on the inside. It is fine as long as it is vulcanized.

[Function] In the constituent elements of the present invention, the use of characters and pattern forming materials in which unvulcanized characters and a pattern-forming rubber layer are provided on one side of a sheet material means that characters and patterns of a predetermined shape can be cut. This is because it can be easily pressurized, vulcanized, and bonded to the surface of a vulcanized rubber product without causing deformation or discoloration. After cutting the unvulcanized characters, characters with a pattern-forming rubber layer on one side of the sheet material, and cutting the pattern-forming material into characters and patterns of a predetermined shape, the characters and patterns are cut into the unvulcanized characters, Vulcanizing and adhering to the surface of the vulcanized rubber product with the pattern-forming rubber layer on the inside provides strong adhesion and prevents fading due to vulcanization byproducts.
Furthermore, this is to prevent characters and patterns having a predetermined shape from being fluidly deformed due to pressure and temperature during press vulcanization, and to prevent discoloration due to mixing.

The reason why the sheet material is peeled off after vulcanization and adhesion is to expose the clearly colored letters and patterns to the surface layer.

The parts of the letters and patterns that are removed from the sheet material will be recessed by the thickness of the sheet material. These dents can be returned to a substantially dent-free state by placing the material in the mold again and subjecting it to additional vulcanization.

[Example] Next, an example of the character and pattern forming rubber product of the present invention and the manufacturing method thereof will be described with reference to the drawings.

1 to 6 show the case where the present invention is applied to a handrail.

In FIG. 1, a sheet material 20 is placed on the surface of the handrail.
, which shows a state in which a diamond-shaped pattern body made of an unvulcanized rubber layer 21 is to be temporarily bonded with the unvulcanized rubber layer 21 on the inside. FIG. 2 shows the state in which these are placed in a predetermined mold, vulcanized and bonded under conditions of a temperature of 140° C. and a pressure of 140 kg/cd, and then the top layer sheet material 20 is peeled off. . FIG. 3 shows the obtained diamond-shaped handrail. In this case, the diamond pattern portion is recessed as shown in FIG.

The dents in such patterns have the effect of increasing the depth of the letters and patterns, but in order to eliminate these dents, after molding the letters, patterns, etc. onto the rubber product, remove only the sheet material and remove the rubber product. , put it into the vulcanization mold again, 30~150kg/c
By pressurizing to J and back-curing for 15 minutes at a mold temperature of 120 to 180℃, rubber products with almost no dents (, 1 letter, pattern, etc. FIG. 5 shows a separate implementation thereof, and FIG. 6 is a cross-sectional view thereof.

[Effects of the Invention] According to the character and pattern forming rubber products and the manufacturing method thereof of the present invention, character and pattern forming rubber products which are extremely clear and have excellent bending resistance and abrasion resistance can be obtained. It is for a.

[Brief explanation of drawings]

Figures 1 to 6 illustrate an example in which the character and pattern-forming rubber product of the present invention and the manufacturing method thereof are applied to a handrail. Figure 1 shows a rhombus pattern on the handrail. Figure 2 is a perspective view showing the condition in which the body is temporarily welded together, Figure 2 is a perspective view showing the state in which the sheet material is peeled off after bonding the rhombic pattern body with hE%, and Figure 3 is the obtained diamond pattern. FIG. 4 is a perspective view of the formed handrail, FIG. 4 is a cross-sectional view thereof, FIG. 5 is a perspective view showing another embodiment, and FIG. 6 is a cross-sectional view thereof. 1: Handrail, 2: Core body, 3: Decorative rubber, 20: Sheet material, 21: Unvulcanized letters, pattern forming rubber layer, 22: Vulcanized and bonded letters, pattern body. Agent Patent Attorney Susuki 1) Toshiyuki Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) On the surface of the vulcanized rubber product, place the unvulcanized characters and pattern-forming rubber layer on one side of the sheet material, and place the pattern-forming material on the unvulcanized character and the pattern-forming rubber layer on the inside. Character and pattern forming rubber products formed by vulcanizing and adhering the sheet material to the substrate, and peeling off the sheet material. (2) Cutting unvulcanized characters, characters with a pattern-forming rubber layer on one side of the sheet material, and pattern-forming material into characters and patterns of a predetermined shape, and converting the characters and patterns into the unvulcanized characters. 1. A method for producing a character and pattern-forming rubber product, which comprises vulcanizing and adhering the sheet material to the surface of a vulcanized rubber product so that the pattern-forming rubber layer is on the inside, and then peeling off the sheet material.