JPH0123154Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is used in the manufacturing process of rubber tires for automobiles, etc., by permanently affixing it to tires to display symbols indicating the person in charge, serial number, manufacturing date, etc. This invention relates to display labels for rubber tires.

Conventional technology In manufacturing tires for automobiles, etc., first, an unvulcanized so-called green tire (green tire) is manufactured in advance, and then pre-cured cement is applied to it to give it a vulcanization accelerating effect, a peeling effect, etc. This is done through a process of coating and then vulcanization molding under heat and pressure conditions. A label indicating the person in charge of manufacturing, etc. is attached to a raw tire during the tire manufacturing process as described above. Therefore, the label undergoes a vulcanization and pressure process after being pasted, and for this reason, the label is required to have the following performances.

In other words, it must not only be able to firmly adhere to the rubber tire and not peel off easily, but also to prevent it from shifting from its designated position or wrinkled due to the heat, pressure, etc. applied during the vulcanization process. There is no problem with the tire rubber exuding from the tire rubber during vulcanization, which causes no discoloration or loss of clarity of the display.Furthermore, it has good workability and is extremely economical. It is required that the

In order to respond to such requests, the inventor of this invention
First, Utility Model No. 50-11498 (Utility Model No. 54-16636)
proposed a tatsu label as shown in . The label according to this prior application uses a composite sheet with an aluminum coating integrally formed on one side of a polyester film as a label base material, with the aluminum coating side as the front and the polyester film side as the back.
The required display is printed on the front side, and the back side is attached to the tire using an adhesive. Although this label was somewhat satisfactory for its intended purpose, subsequent practical experience has revealed that it has the following new problems. That is, in general, the printability of the display on the front aluminum coating surface is poor, and not only is it difficult to print clearly, but when the display is rubbed during the label manufacturing process, it tends to become unclear. The problem was that display defects were likely to occur. In addition, when printing on aluminum coated surfaces,
There were also drawbacks such as severe damage to the printing plate and short service life. Furthermore, the polyester film on the back side itself has excellent heat resistance and is good in that it does not exhibit harmful expansion and contraction behavior even under heating, but on the other hand, due to the smoothness of the surface, It has been difficult to obtain sufficient adhesion properties for rubber tires, and problems have been observed in which peeling occasionally occurs due to severe expansion and contraction of the tire.

Furthermore, after being attached to a tire, the plasticizer component migrates and oozes out from the tire, resulting in a phenomenon in which the display becomes unclear. This phenomenon is
Due to the extremely large number of pinholes that inevitably exist in the polyester film on the back side of the base material, exuded components, mainly consisting of plasticizer, from the tire easily pass through the film and emerge on the top side. , the top surface is dyed black, while the aluminum coating covering the surface originally has a nearly perfect barrier function, but it still has pinholes here and there, and from these pinholes, As a result of the above-mentioned exuded components intensively penetrating the surface, if there is a cut-out part of the printed display in that part, the part that is originally silver and plays the role of display becomes partially black. This is because a missing part is created in the display and the display function is destroyed.

Therefore, in order to solve these problems, the inventor of the present invention improved the printing suitability by further applying resin surface treatment or printing base coating treatment to the front aluminum coating, while applying this treatment to the back polyester film surface. We also attempted to roughen the surface to improve adhesion suitability. Of course, these improvement measures were effective, but in any case, they added an extra processing step, which resulted in an additional disadvantage of increasing costs. It was hot.

Against the above background, the inventor of the present invention repeated various trials and errors in order to solve the above problems, and found that the label base material according to the previous proposal could be used as a label base material by converting the front and back sides. They found that very good results could be obtained and completed the present invention.

Means to Solve the Problem This idea is simply a laminated composite sheet made of an integrated polyester film and an aluminum coating, with the polyester film side facing up and the aluminum coating side facing back. The main improvement is for use in label base materials.

That is, this invention uses a composite sheet with an aluminum coating integrally formed on the lower surface of a transparent polyester film as a label base material, and displays a single type of display symbols such as letters and numbers on the polyester film surface on the front side of the base material in multiple vertical and horizontal directions. At the same time, a heat-resistant transparent synthetic resin film is integrally formed on the printed surface, and a release paper is attached to the back side of the label base material via a heat-resistant pressure-sensitive adhesive layer. The gist of the present invention is a display label for rubber tires, which is formed by making vertical and horizontal cuts to individually separate single pieces of tacked label consisting of each display symbol on a laminated paper pattern.

Embodiments This invention will be described below with reference to illustrated embodiments.

In the illustrated embodiment, 1 is a transparent polyester film, 2 is an aluminum coating integrally formed on the lower surface by vacuum deposition, and a label base material A is constituted by these composite sheets. On the upper surface of the base material, that is, on the surface of the polyester film, display symbols 3 consisting of predetermined letters, numbers, etc. are printed in a single type and in large numbers in parallel in the vertical and horizontal directions. A heat-resistant transparent synthetic resin film 4 is formed, and a required area of release paper 6 is adhered to the lower surface of the film with a heat-resistant pressure-sensitive adhesive layer 5 interposed therebetween. Then, the laminated layers on the release paper 6, that is, the base material A, the coating 4, and the pressure-sensitive adhesive layer 5, are formed into a large number of display symbols 3 by cuts 7 made vertically and horizontally at required intervals.
It is designed so that it can be separated into individual label pieces 8 consisting of.

In this type of label, the material of the base material A is an important factor in determining the quality of the label's performance. In this invention, a composite sheet in which an aluminum coating 2 is integrally molded onto a polyester film 1 having particularly excellent heat resistance is used as the label base material A. Polyester film has a melting point of approximately 260°C and is excellent in heat resistance, as well as extremely low heat shrinkage and excellent thermal stability and strength. There is almost no change even under heating and pressurizing conditions at 120-180℃ for 30-60 minutes.
There is no fear that the label will shift, wrinkle, become brittle, etc. even after undergoing the vulcanization molding process. Such effects are even more obvious when compared with conventionally commonly used label base materials. For example, vinyl chloride film not only cannot withstand vulcanization temperature conditions in terms of heat resistance, but also suffers from significant staining and changes in physical properties due to the plasticizer it contains and components exuded from tire rubber. It is unsuitable as a tire label, and when it is made of fluorine resin film, silicone resin film, etc., there is a problem with the adhesive strength with the adhesive layer 5, and the label may deviate greatly from the proper position on the tire or peel off. There are some obvious flaws. Furthermore, polypropylene film and polyethylene film are inferior to polyester film in terms of heat resistance and strength, and cellophane has drawbacks such as significant thermal embrittlement caused by the vulcanization process. Either the desired effect cannot be obtained, or the performance is inferior to that of the present invention. In addition, the polyester film used in this invention
The thickness is preferably about 15 to 50μ, especially 20 to 35μ.
degree is preferred. If it is 15μ or less, the label tends to wrinkle, and if it is 50μ or more, the label tends to shift.

Integrally molding the aluminum coating 2 on the transparent polyester film 1 further improves the thermal stability of the label, improves adhesion to tires, and prevents the display from becoming unclear.
This is to increase conspicuousness. That is, the aluminum coating 2 thereby controls expansion and contraction, increases the thermal stability of the label base material A, more effectively prevents wrinkles and shearing, and also prevents various components exuding from the tire rubber. This functions to prevent the display symbol from reaching the three sides of the display symbol and to maintain the visibility of the display symbol 3 well. In addition, the metallic luster of the aluminum coating 2 makes it easy to visually determine the location of the label when it is attached to a tire, thereby improving visibility. And label base material A
The reason why the transparent polyester film 1 side is used as the front side is that this improves the printing suitability of the display symbol 3 and makes its fixation good, while also making it possible to visually see through the metallic luster of the aluminum coating 2. Moreover, the aluminum coating 2 prevents staining and discoloration of the film 1, and also achieves the effect of improving adhesion suitability to tires.

The ink used for printing the display symbol 3 is selected so that it can withstand the vulcanization and pressure process and will not change color or fade. For example, it is preferable to print using a known metal printing ink.

The transparent synthetic resin coating 4 applied on the printed surface of the display symbol 3 serves as a protective layer for the display symbol 3 surface. Like the base material A, this coating 4 also needs to be made of a material that does not substantially undergo thermal deformation even when placed under tire vulcanization molding conditions, and is preferably made of silicone, polyester film, etc. .
The label affixed to a raw tire is strongly pressed against the inner wall of the mold during the tire vulcanization molding process.On the other hand, the tire rubber is greatly deformed and moved inside the mold, so the label surface is The transparent synthetic resin coating 4 protects the display symbol 3 from such friction and prevents the display from becoming unclear. In addition, this film A uses a film with a roughened surface, and when it is bonded with the rough surface facing the base material A, the vulcanization and pressure process is performed to further strengthen the integrity with the base material A. This is advantageous in that it can more effectively prevent the label from shifting.

It goes without saying that the single label pieces 8 are peeled off one by one from the release paper 6 and affixed to the tire.
It is desirable that the pressure-sensitive adhesive layer 5 for pasting has sufficient tackiness at room temperature, but also heat-cures through the vulcanization process and is firmly integrated with the tire rubber. It is best to use a thermosetting material that will change.

Effects of the invention As mentioned above, the label according to this invention is composed of a composite sheet in which a polyester film and an aluminum coating are integrally formed as a label base material, so it has extremely excellent thermal stability and is It does not cause any significant harmful deformation even when used for rubber tires, and does not cause harmful deviations, deformations, wrinkles, etc. even when it is applied to raw rubber tires and then subjected to the vulcanization molding process. Since the blooming components from the tire rubber are blocked by the aluminum film, the transparency of the film is not impaired, the color does not change, and the display layer is not damaged. The display will not become blurred due to significant staining or discoloration; rather, the display will clearly appear in the metallic color of the aluminum coating, resulting in a highly visible and beautiful appearance.

In particular, in this invention, the label base material has the polyester film side as the front side and the aluminum coating side as the back side, and a display is printed on the polyester film side by normal printing, and the aluminum coating side is attached to the tire. It is configured as. Therefore, the polyester film on the front side is
Originally, it has an extremely smooth surface, and due to its unique properties as a resin, it has excellent printing properties, so-called ink transfer, and its fixing properties are excellent, and it can be made with less wear and tear on the printing plate. It is possible to easily form a clear display while increasing the useful life of the printing plate, and to prevent the occurrence of defective products or defective parts of the display. Furthermore, although the aluminum coating on the back side is formed on a polyester film by vacuum deposition as a conventional technique, the bottom side exhibits a rough microstructure due to vapor-deposited fine particles. Therefore, when this surface is bonded to a tire using an adhesive, it achieves an extremely strong bond and has excellent fixing properties.
As long as an appropriate adhesive is used, the effect of eliminating the risk of inadvertent peeling or flaking from the tire surface is achieved.

In addition, this design has a polyester film on the front side of the label base material and an aluminum film on the back side, so the barrier layer remains intact even after being attached to a green tire and going through the tire heat vulcanization molding process. Due to the presence of the aluminum coating, which has excellent functions as
Only a small amount of plasticizer component oozes out from the pinholes in a very small portion. Therefore, even if there is a porous polyester film on the front side, a large amount of the above exuded components will not penetrate to the film surface side, and the exuded components will cause the display to become unclear, or there will be missing parts. It is possible to eliminate the defects of conventional products, such as the occurrence of

In addition, since the surface side of the aluminum coating is already protected by a polyester film at the label base material stage, the surface has a high gloss to begin with, and strong rubbing force is not applied to the surface from the outside during the printing process. Even if there is a problem, uneven gloss will not occur on the surface and the product value will not be reduced.

In addition, since the display surface of the label according to this invention is covered with a heat-resistant transparent synthetic resin film, the display may disappear or the precure cement may adhere directly to the display surface, making the display difficult to see. There are no drawbacks such as, etc., and when you use it, you can easily peel off the single pieces of tatsu label cut one by one from the release paper, so you don't have to do the troublesome work of cutting it with scissors when you use it. Not only is it unnecessary and has good work efficiency, it is also possible to prepare multiple types of tatsu label paper with different symbols and numbers individually in the required number. Of a set of many types of label paper with a large number of types, only the frequently used types can be refilled individually, and only the less frequently used types of each set always have a large residual quantity. It also has various advantages, such as not having the disadvantage of large economic losses.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted plan view of an example of a label according to the present invention, and FIG. 2 is a partially enlarged sectional view of the same. DESCRIPTION OF SYMBOLS 1... Polyester film, 2... Aluminum coating, 3... Display symbol, 4... Heat-resistant transparent synthetic resin coating, 5... Heat-resistant pressure-sensitive adhesive layer, 6... Release paper, 7...
Cut line, 8...Tatsukura label single piece, A...Label base material.

Claims (1)

[Scope of utility model registration request] A composite sheet with an aluminum coating integrally formed on the lower surface of a transparent polyester film is used as the label base material, and a large number of single types of display symbols such as letters and numbers are printed in parallel vertically and horizontally on the polyester film surface on the front side of this base material. At the same time, a heat-resistant transparent synthetic resin film is integrally formed on the printing surface, and a release paper is attached to the back side of the label base material via a heat-resistant pressure-sensitive adhesive layer, and each laminated layer on the release paper is coated with a heat-resistant transparent synthetic resin film. A display label for rubber tires that is made by making vertical and horizontal cuts to separate a single label consisting of a display symbol into individual pieces.