JPS5955483A - Symbol indication label - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a symbol display label, and more specifically to a loft number attached to a green tire (tire before vulcanization) for lot follow-up during tire manufacturing. Regarding symbol display labels such as display labels.

Conventionally, this type of label uses an aluminum vapor-deposited film as a base material, coats an adhesive on one side, and prints a loft number on the other side.In addition, the loft number is printed on the display side to protect the lot number. There is one in which a transparent polyester film is laminated with a heat-curable adhesive. However, when this label is attached to a green tire, when the tire is cured, the adhesive layer is co-vulcanized with the vulcanizing agent contained in the green tire and adheres to the tire side, but it does not adhere to the aluminum vapor-deposited film. Therefore, there is a drawback that it is easy to separate from the tire after tire vulcanization.

In order to overcome this drawback, we use adhesives that contain a rubber such as natural rubber or synthetic rubber and a tackifier, and we also use rubber such as natural rubber or synthetic rubber that does not contain a vulcanizing agent as a base material. A technology has been proposed in which a sheet is used to vulcanize both the adhesive and the base material during tire vulcanization using a vulcanizing agent that is included in green tires, in order to integrate it with the tire (Japanese Patent Application Laid-Open No. 56-154780). issue). However, even in the case of such a label, there are drawbacks as described below.

(1) Since the surface of the base material is adhesive, when a loft number is printed on the surface, the plate on which ink is attached and the surface of the base material stick together. As a result, when the plate is separated from the surface of the base material, the base material is dragged and lifted by the plate, and as a result, each time the plate is pressed, the base material layer advances by the length of the plate, causing a slight shift. For this purpose, a transparent polyester film is then laminated onto its substrate surface via a heat-curable adhesive, and then horizontal and vertical cuts are made in the laminate to successively separate the lot number display label single pieces into individual pieces. When applying the label, the printed lot number is shifted from the center of the single label piece, making it difficult to obtain a good label (
(See Figures 3(C) and (a)).

(2) If this label is attached to a green tire and vulcanized, the base material of the rubber sheet, such as natural rubber or synthetic rubber, will easily flow as the rubber of the green tire flows during vulcanization. , depending on where it is pasted, it may stretch or
Shrink or wrinkle. Therefore, the loft number printed on the surface of the base material also deforms according to the flow of the base material, making it difficult to read the number.

The present invention was developed in view of the above circumstances.It has good printing processability during manufacturing, and when attached to a green tire, it simply adheres firmly to the tire after tire vulcanization. Our objective is to provide a symbol display label that completely suppresses the deformation of the base material during tire vulcanization, and thus the change in lot number, and makes it easy to read the loft number.

For this purpose, the symbol display label of the present invention is produced by laminating a crosslinked or semi-crosslinked rubber base material layer with a symbol displayed on the surface on a rubber adhesive layer, and then ``Secondly, a transparent film is laminated via a transparent heat-curable adhesive.

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

In FIG. 1, E is a symbol display label, which is made by laminating a rubber base material layer 2 on a rubber adhesive layer 1, and this rubber base material layer 2 is coated with a transparent heat-curable adhesive. A transparent film 4 is laminated with a film 6 interposed therebetween. Note that symbol 5 is displayed on table mi of the rubber base material layer 2. 6 is a release paper, and 7 is a cut.

The rubber adhesive layer 1 is made of rubber such as natural rubber or synthetic rubber and a tackifier. Examples of the tackifier include solid tackifiers such as petroleum resins, terpene resins, rosin resins, and phenol resins, and liquid tackifiers containing liquid polymers such as polybutene and polyisoprene. The compounding ratio of rubber and tackifier is rubber 1
It is preferable that the amount of the tackifier is 10 to 200 parts by weight per 00 parts by weight. The rubber adhesive layer 1 has the ability to sufficiently temporarily adhere the obtained label to a predetermined position of the green tire until it is vulcanized, and
During tire vulcanization, co-vulcanization occurs with the vulcanizing agent contained in the green tire, resulting in sufficient adhesion to the tire. For this reason, by adding a vulcanizing agent similar to that used for green tires to the adhesive layer 1, it is possible to obtain even stronger adhesion to the tire, but when stored as a label, the vulcanizing agent gradually The adhesive layer 1 is vulcanized and its adhesiveness is lost after a long period of time.
It is undesirable to add a vulcanizing agent to the

The rubber base material layer 2 is mainly composed of rubber such as natural rubber or synthetic rubber, and contains a crosslinking agent, a crosslinking accelerator, carbon black, white carbon, calcium carbonate, other fillers, additives, etc. , crosslinked or semi-crosslinked, and a symbol 5 such as a loft number is displayed on the surface by printing or the like. In this way, since the crosslinking of the rubber base material layer 2 is carried out before tire vulcanization, the deformation of the label due to the rubber flow of the green tire during tire crosslinking, and even the deformation of the label.
It is possible to eliminate deformation of lot numbers and make it easier to read loft numbers. Furthermore, because the rubber base material layer 2 is crosslinked before the lot number is printed on its surface, the adhesiveness of the surface of the rubber base material layer 2 is lost due to crosslinking, resulting in a loft. It is possible to prevent the number plate from adhering to the rubber base material layer 2 and improve printing processability. As the crosslinking system, general rubber crosslinking systems such as sulfur crosslinking and quinoid crosslinking can be used, but it is also possible to use, for example, a super accelerator that allows crosslinking to proceed at the same time when manufacturing the rubber base material layer 2. Preferred are sulfur crosslinked systems and crosslinked systems using I'-quinone dioxime. However, even with a general rubber crosslinking system, the purpose can be achieved by forcibly heating and crosslinking the tire before vulcanization, preferably before printing, so the crosslinking system is not particularly limited.

Of course, since the rubber base material layer 2 is mainly composed of rubber such as natural rubber or synthetic rubber, even if it is already crosslinked or semi-crosslinked, the adjacent rubber base material layer 1 and further adjacent green Since the tire is uncrosslinked, it can be sufficiently adhered to and integrated with the tire during tire vulcanization.

The transparent film 4 is attached to the rubber base layer 2 via a transparent heat-curing adhesive 6 in order to protect symbols 5 such as loft numbers such as letters and numbers displayed on the surface of the rubber base layer 2. It is installed on top of 2. This transparent film does not deform or discolor when heated during tire vulcanization.
Any flexible transparent plastic film can be used, and polyester film is generally preferably used. In addition, the heat-curing adhesive 6 needs to be transparent so that the symbol 5 can be seen from the outside of the transparent film 4, and it also needs to be transparent so that the symbol 5 can be seen from the outside of the transparent film 4. It is preferable to adhere the transparent film 4 and the rubber base material layer 2 until they are mounted and used, and for this purpose, a heat-curable adhesive such as an acrylic adhesive or a phenolic adhesive is generally used.

Examples and comparative examples are illustrated below.

Example: To 100 parts by weight of masticated natural rubber, tackifier Finton A-100 (petroleum-based resin, manufactured by Nippon Zeon Co., Ltd.) was added.
120 parts by weight was dissolved in toluene and applied onto release paper so that the film thickness after drying was 30 microns.
A pressure-sensitive adhesive layer was produced by heating and drying.

Separately, a rubber composition with the formulation shown in Table 1(A) was kneaded using a Banbury roll, formed into a sheet, cut, dissolved in toluene, and then the accelerator shown in Table 1(B) was added. After that, the mixture was mixed evenly.

Thereafter, it was applied onto a release paper so that the film thickness after drying was 70 microns, and dried in a hot air dryer at 90° C. to produce a base material layer.

The surface of the resulting base material layer had no tackiness at all and was already crosslinked. (Put part of the base material layer in toluene,
Although it was immersed for 4 hours, the base material layer only swelled and did not dissolve, confirming that it was crosslinked.) (Margins below this page) Table 1 8U8) 6-t-
Butylphenol) 2 Zinc dibutyldithiocarbamate 3 2-Mercaptobenzothiazole After this, the adhesive layer and the base material layer are laminated together, and at the same time, the release paper on the profiteer layer side is removed, and the adhesive layer and the base material layer are laminated. The resulting material was rolled up and cut into a predetermined width to obtain a label material.

Further, an acrylic heat-curable adhesive Brimal HA-8 (manufactured by Rohm and Haas) was applied to a polyester film with a thickness of 25 microns so that the thickness after drying was 20 microns, and the release paper was removed. It was rolled up with a sandwich and cut to the specified width.

Next, as shown in Figure 2, a loft number is printed on the base material layer of the label stock produced earlier, and a polyester film is pressed onto it so that the heat-curing adhesive is in contact with it. As shown in Fig. 2, the pieces were moved in the direction of the arrow and punched out into individual pieces measuring 9 mm x 15 mm to form labels. At this time, there was no tackiness on the surface of the base material, and the loft number plate and the base material did not stick to each other, indicating good printing processability. Afterwards, when pressing the polyester film and punching it out to the desired size,
The base material did not shift, and as shown in Figure 2, the lot number was always at the center of each label cut out by rJ, making it possible to obtain good labels.

Next, put this label on the tire size 645-14゜4P.
It was pasted on the side part of a green tire of R, placed in a mold, and vulcanized at 165° C. for 15 minutes.

As a result, there was no deformation of the label or loft number, and the adhesion to the tire was good. This tire was mounted on a taxi and traveled for 30,000 km, but no separation of the label from the tire was observed.

Comparative Example The adhesive layer and base material were prepared in exactly the same manner as in the example, except that the base material was manufactured using a rubber composition with the formulation shown in Table 1 (A) in the example above, excluding the crosslinking agent. The layers were produced and laminated together to produce a label stock.

The surface of the base material of this original label exhibited tackiness because the base material was not crosslinked. When moving the original label in the direction of the arrow in Figure 3 and pressing the plate with the loft number to be printed onto the surface of this base material, the base material surface is sticky, so the plate is coated with ink. The surface of the base material becomes sticky, and when the plate is separated from the profiteer surface, the original label material that advances by the length of the plate will shift slightly, and then the polyester film is pulled out using a heating adhesive and the label is separated into a single piece. When this was done, the printed lot number was shifted from the center of the single label piece as shown in FIGS. 3(c) and 3(d), and a good label could not be obtained.

In addition, this label was used on the same tire as in the example, and as a result of vulcanization, the base material expanded according to the rubber flow of the green tire, and the M material end was one end of the polyester film. It was deviated by 12+nm and protruded from the polyester film. Naturally, the lot number printed on the base material was also elongated and difficult to read.

As explained above, the symbol display label according to the present invention has an adhesive layer and a base material layer mainly composed of rubber such as natural rubber or synthetic rubber, so that when it is applied to a green tire and vulcanized, it can be applied to a tire. In addition to strongly adhering to the tire, since the base material layer has already been crosslinked before the tire vulcanization, it is possible to eliminate the deformation of the label and the deformation of the lot nano (-) caused by the rubber flow of the green tire during tire vulcanization. This has the advantage of making it easier to read the lot number.Furthermore, crosslinking of the base material layer can eliminate the adhesiveness of the surface of the base material layer, so crosslinking can be used to print the loft number on the surface of the base material. By performing this before the step, there is an advantage that the printing processability when printing the lot number afterwards can be improved, and the deviation of the lot number from the center of the single label piece caused by non-crosslinking can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram of an example of the symbol display label of the present invention, FIG. 2 is a schematic explanatory diagram of its manufacturing process, and FIG. 3 is a schematic explanatory diagram of the manufacturing process according to the prior art. E... Symbol display label, 1... Rubber adhesive layer, 2
... Rubber base material layer, 6 ... Transparent heat-curing adhesive, 4 ... Transparent film, 5 ... Symbol. Agent: Patent Attorney Shin Ogawa − Patent Attorney Ken Soguchi Patent Attorney Kazuhiko Saishita 2nd Shij Figure 3

Claims (1)

[Claims] A crosslinked or semi-crosslinked rubber base material layer with a symbol displayed on the surface is laminated on the rubber adhesive layer, and a transparent heat-curable adhesive is further placed on top of this rubber base material layer. A symbol display label made of laminated films.