JPS623814Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is a label that is permanently affixed to tires to display the serial number, date of manufacture, symbol of the person in charge of the work, etc. during the manufacturing process of rubber tires for automobiles, etc. Regarding.

BACKGROUND ART When manufacturing rubber tires, a label displaying a serial number, manufacturing date, etc., is attached to an unvulcanized green tire in advance for quality control, and then the tire is vulcanized and molded. Therefore, display labels used for such purposes must not only be able to adhere to rubber tires as strongly as possible and not be easily peeled off, but also
Even after the vulcanization molding process, it is required to maintain clear display performance without shifting from a predetermined position or generating wrinkles due to heat, pressure, etc. applied during the vulcanization molding process.

Based on such requests, conventionally, for example,
Various rubber tire labels have been proposed, such as those shown in Japanese Patent Publication No. 54-16636 and Japanese Patent Publication No. 53-29595.

Problems that the invention aims to solve However, in all of these conventional products, the label base material, which is a support such as synthetic resin film, paper, or aluminum foil, is fixed to the rubber tire surface using an adhesive. Even when using an adhesive with the best possible adhesive effect, there is a limit to its adhesive strength, and it is not always possible to bond the label base material firmly and stably to the tire. It was not always possible to adhesively fix it to a surface.
In addition, since it is necessary to laminate a protective film on the label base material to cover and protect the display layer, it is structurally necessary to laminate the two support layers of the label base material and the protective film, and the areas between them. Two adhesive layers are required on the bottom surface of the label substrate, resulting in a multi-layered structure of four or more layers, which not only increases manufacturing costs, but also prevents the relative positional shift of the protective coating on the label substrate surface. This has resulted in disadvantages such as the display may become unclear.

This invention aims to eliminate the above-mentioned drawbacks and provide a display label for rubber tires that can fully satisfy the above-mentioned requirements.

Means to Solve the Problems This invention was developed to use heat-reactive rubber as a label base material, which exhibits adhesive strength when heated and pressurized during vulcanization of rubber tires. A heat-resistant transparent synthetic resin coating is laminated and integrated on the label base material using a heat-adhesive film that has room temperature adhesiveness on its surface, and the label base material and the synthetic resin are laminated and integrated. To provide a display label for a rubber tire, which is provided with a printed display layer on either of the opposing surfaces of a coating.

Embodiment Now, an embodiment of this invention will be described based on the drawings. In FIGS. 1 and 2, 1 is a label base material made of a rubber-based thermal adhesive film, and 2 is a label base material itself on which the label base material itself is placed. 3 is a display layer printed on the lower surface of the heat-resistant transparent synthetic resin coating, which is applied by printing on the lower surface of the heat-resistant transparent synthetic resin coating, and 4 is attached to the lower surface of the label base material 1. The releasable release paper 5 is vertical and horizontal cuts for individually separating the label single pieces 6, 6, . . . made of each display layer 3.

By the way, the thermal adhesive film used for the label base material 1 is originally one in which the rubber tire display label of the present invention is temporarily attached especially at the green tire stage in the tire manufacturing process, and then subjected to a vulcanization molding process. Therefore, it must exhibit the desired adhesive strength and be thermoset under the heating and pressurizing conditions during this vulcanization molding process. That is, it needs to exhibit good adhesive strength under heating and pressurizing conditions of 120 to 180° C. for 30 to 60 minutes, which are the usual vulcanization molding conditions for tires. Moreover, since the object to which the label is attached is a rubber tire, the use of a rubber-based thermal adhesive film is limited in order to have compatibility with the rubber tire and achieve strong fusion and integral bonding. In particular, it is preferable to use a heat-adhesive film containing nitrile rubber as a main component to which a heat-reactive alkylphenol resin is added. Further, it is preferable to use a rubber-based heat-adhesive film that is blackened by adding carbon black, since this can improve the visibility of the display layer 3 of the label.

The thickness of the label base material 1 made of a thermal adhesive film is preferably about 0.02 to 0.10 mm, particularly about 0.03 to 0.10 mm.
It is preferable to set it to about 0.07 mm. If it is too thin, it is difficult to expect sufficiently strong adhesion to the tire, while if it is too thick, it not only increases costs but also tends to cause slippage.

The rubber-based heat-adhesive film used in this invention originally has some tackiness on its surface.
Therefore, by pressing the transparent synthetic resin film 2 onto the label base material using a pressure roll, the two can be sufficiently bonded and integrated to the extent that they will not be peeled off inadvertently.
On the other hand, temporarily attaching a single label piece 6 to a green tire can be done to a necessary and sufficient degree by utilizing the room temperature adhesiveness of the label base material 1, but it is possible to temporarily attach the single label piece 6 to a green tire to a necessary and sufficient degree. If necessary, an extremely thin temporary adhesive layer may be provided on the lower surface side of the label base material 1 in order to improve workability. However, this temporary adhesive layer must not be such as to impede the thermal adhesion performance of the label base material itself to the tire. Therefore, label base material 1
It is best to use a similar type of adhesive.

The display layer 3 is made up of printed displays such as numbers and symbols that display manufacturing numbers, manufacturing dates, etc., and is applied to the top surface of the label base material 1 or when the label base material 1 has good transparency. may be provided on the lower surface thereof, but preferably, a large number of them are printed vertically and horizontally on the back surface of the transparent synthetic resin coating 2, as shown in the illustrated embodiment. The ink used for printing the display layer 3 should be selected so as to withstand the tire vulcanization molding process and not discolor. For example, known metal baking inks are preferably used.

The heat-resistant transparent synthetic resin coating 2 is substantially the display layer 3
It plays the role of holding and protecting the tire, does not undergo thermal deformation even when placed under tire vulcanization molding conditions, and can firmly adhere to the label base material 1 made of a thermal adhesive film. It is necessary that there be. Examples of such coating material include polyester resin film, polycarbonate resin film, fluororesin film, silicone resin film, etc. Among them, polyester resin film is particularly suitable.

These films preferably have a roughened lower surface and are coated with a so-called anchor coat in order to ensure strong adhesion and integration with the label base material 1. Thereby, in the tire vulcanization molding process, it is possible to more effectively prevent the display label from shifting due to pressure-sliding contact between the label surface and the inner wall of the mold. Although the thickness of the resin coating 2 is not particularly limited, it is preferably about 10 to 100 microns, particularly preferably in the range of 20 to 50 microns. If it is too thick outside this range, there is a high risk of peeling due to the vibrations and distortions applied to the tire while driving.On the other hand, if it is too thin, it will be temporarily attached to the tire and subjected to the vulcanization molding process. case,
There is a tendency for wrinkles, breakage, etc. to occur easily.

In the illustrated embodiment, rectangular single label pieces 6 are arranged vertically and horizontally on a release paper 4 of a predetermined size with cuts 5 interposed therebetween.
In order to avoid the tendency of the periphery, especially the corner part, to peel off from the tire and spring up, it may be formed into a rounded shape such as a circle or a circular shape if necessary, or it may be formed into a coiled shape. The product may be manufactured in a roll by arranging a large number of single label pieces 6 in a plurality of rows on one side of a long belt-shaped release paper that is rolled up.

Function The display label according to this invention is one in which each single label piece 6 is peeled off from the release paper 4 and affixed to a green tire. The tire is then subjected to a vulcanization process. In the vulcanization molding process, the label base material 1 exerts adhesive strength due to the heat applied during vulcanization and pressure contact with the inner wall of the mold, and as shown in FIG. It becomes a partially fused state and is strongly integrated, and the transparent synthetic resin coating 2
Both are firmly connected and integrated. Therefore, in the state after tire vulcanization, the single support layer of the transparent synthetic resin coating 2 having the display layer 3 on the lower surface appears to be directly adhered to the tire T surface, and the resin coating 2 The display layer 3 can be clearly seen through it.

Effects of the invention As mentioned above, this invention allows the label base material itself to
The label is made of rubber that fuses with the rubber tire, and is made of a rubber-based thermal adhesive film that exhibits strong adhesive force and hardens when heated and pressurized, so it can be vulcanized after temporarily attaching the label to the green tire. By going through the molding process, it can be completely and firmly attached to the tire surface, and since the label base material has good conformity to the tire surface during vulcanization molding, it can be displayed in the mold. The label does not significantly shift in its adhesion position, and furthermore, it does not induce wrinkles due to the shift, and it can maintain good visibility and be firmly attached to the tire. In addition, due to the protective effect of the transparent synthetic resin coating 2, the display layer 3 may be in pressure contact with the inner wall of the mold during the vulcanization molding process, and may be strongly slid against the inner wall of the mold due to deformation and movement of the rubber tire. However, there are no disadvantages such as the display disappearing or the precured cement applied to the tire adhering to the display surface and staining the display. Furthermore, since the label base material 1 itself can be thermally bonded to the tire T surface, there is no need to provide an adhesive layer for adhering the protective resin coating on the label base material as in conventional products. In addition, it becomes possible to eliminate the need to provide an adhesive layer on the lower surface of the label base material, and the manufacturing cost can be reduced by simplifying the structure.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of this invention, FIG. 2 is a partially cross-sectional view, and FIG. 3 is a sectional view of the device in use when it is attached to a tire. DESCRIPTION OF SYMBOLS 1... Label base material, 2... Heat-resistant transparent synthetic resin coating, 3... Display layer, 4... Release paper.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A heat-responsive, rubber-based thermal adhesive film that exhibits adhesive strength through heat and pressure applied during vulcanization of rubber tires, and that fuses with rubber tires, A film that has room temperature adhesiveness on its surface is used as a label base material, and a heat-resistant transparent synthetic resin coating is laminated and integrated on the label base material, and both of the opposing surfaces of the label base material and the synthetic resin coating are laminated and integrated. A display label for rubber tires with a crab-printed display layer. (2) The display label for rubber tires according to claim 1, wherein the label base material is a rubber thermal adhesive film containing nitrile rubber as a main component. (3) The display label for rubber tires according to claim 1 or 2, wherein the heat-resistant transparent synthetic resin coating is a polyester film. (4) The display label for rubber tires according to any one of claims 1 to 3 of the utility model registration claims, wherein the lower surface of the heat-resistant transparent synthetic resin coating is roughened.