JPH07306642A - Bar code label for rubber tire and label base material - Google Patents

Abstract

PURPOSE:To provide a bar code label for a rubber tire that can be issued as occasion may demand by imparting a bar code by a heat transfer system without needing overcoat, held in the initial shape without the generation of dislocation and thermal deformation such as a crease even being applied to a green tire and subjected to vulcanizing treatment, and rigidly bonded to the formed tire throughout a vulcanizing process while keeping the imparted bar code clear since ink is hardly transferred to a metal mold so as to hardly generate the pollution of the metal mold and the appearance failure of the tire. CONSTITUTION:One matted face of a plastic film with a melting point of 200 deg.C or higher, containing a white filler is provided with a heat transfer bar code 1, formed of resin group ink, in the exposed state, and the other face of the plastic film 2 is provided with a rubber group adhesive layer 4, containing a vulcanization accelerator but not containing a vulcanizing agent, through a primer layer 3, thus forming a bar code label for a rubber tire using the above-mentioned label base material before imparting the bar code. This bar code label enables the individual control of every tire in the production and circulation processes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bar code label for rubber tires which can be individually issued to green tires for automobiles, aircrafts, etc. and which is excellent in non-releasability and display clarity, and a label base material thereof.

[0002]

2. Description of the Related Art Conventionally, labels for various purposes have been proposed which are adapted to be adhered to rubber tires, and bar code labels used for production control and the like have also been proposed (Japanese Patent Publication No. 53-53).
29595, JP-A-51-128386,
JP-A-4-262906, Jpn. Pat. Appln.
6, gazette of Japanese Utility Model Publication No. 62-3814, gazette of Japanese Utility Model Publication No. 61-
No. 162885 and Japanese Utility Model Laid-Open No. 2-133907).

In the above, the development of a system for managing the production and distribution of each tire by using a bar code label has become an important issue in recent years. In that case, a barcode for each tire can be attached to the barcode label at the production site, and it can be issued on-the-fly to handle high-mix low-volume production.It can be applied to green tires before vulcanization and the vulcanization process can be performed. Therefore, it is required to be able to firmly adhere without any positional deviation or wrinkles.

However, in the case of a label of the type in which a bar code is overcoated with a transparent sheet or the like, it is difficult to issue the label on an ad hoc basis at the production site and the like. There is a problem that the individual information of the tire such as the product number needs to be managed via the host computer.

Further, the conventional label exerts only an adhesive force that can be easily peeled off with a fingertip after the vulcanization treatment, is easily detached during the operation of an automobile or the like, and tire management in the distribution process cannot be realized satisfactorily. There was a problem. The label that is easily detached has a drawback that it is difficult to apply it to a bead portion that is easily noticeable as a peeling defect or the like. Further, there is a problem that ink forming a bar code during vulcanization is taken (transferred) to a mold, resulting in contamination of the mold, poor appearance of the tire, and blurring of the bar code. The overcoat may be provided for the purpose of preventing such ink transfer.

[0006]

DISCLOSURE OF THE INVENTION The present invention does not require an overcoat and can be issued by applying a bar code by a thermal transfer method, and even when applied to a green tire and subjected to vulcanization, misalignment, wrinkles, etc. It retains its initial shape without causing thermal deformation, and it is difficult for ink to transfer to the mold, resulting in mold contamination and poor tire appearance, maintaining the applied bar code clearly and vulcanizing process An object of the present invention is to obtain a bar code label for a rubber tire that adheres firmly to a formed tire through.

[0007]

According to the present invention, a plastic transfer film containing a white filler and having a melting point of 200 ° C. or higher is exposed on one surface of a matte-treated plastic film, and a thermal transfer bar code made of a resin ink is exposed. A rubber tire bar code label, characterized in that it has a vulcanization accelerator on the other surface of the plastic film via a primer layer and the vulcanizing agent does not contain a rubber-based adhesive layer, and before the bar code is applied to such a label. To provide a label base material composed of

[0008]

[Function] By using a plastic film containing a white filler and having a melting point of 200 ° C. or higher, a strong adhesion with the rubber layer is achieved, and the vulcanization treatment does not cause thermal deformation such as misalignment or wrinkles. It is possible to obtain a label that retains a good shape.

Further, by the method of applying the thermal transfer barcode with the resin ink through the matte surface of the film, the thermal transfer method using the thermal transfer printer and the ink ribbon is necessary for the individual management of each tire in the production and distribution process. It is possible to add a unique barcode at the production site and issue a label on occasion, and apply it to a green tire without an overcoat to prevent mold contamination due to ink transfer, tire appearance defect, and application bar. Vulcanization can be performed while preventing the code from being blurred. In this case, it is considered that the ink forming the bar code flows into the unevenness of the matt-treated surface and is firmly fixed to the label surface even at the vulcanization temperature, so that the ink transfer is prevented. When applying a bar code with a wax-based ink or applying a bar code to a non-matte treated surface, transfer of the ink due to heat during vulcanization causes mold contamination, poor tire appearance, and blurring of the applied bar code.

Further, a rubber-based adhesive layer containing a vulcanization accelerator via a primer layer and containing no vulcanizing agent is used for adhesion treatment to a green tire, a positional deviation with respect to a formed tire through a vulcanization process, and the like. It is possible to achieve strong adhesion without attending. The adhesive strength is usually 160 to 1
It is 3kg / cm or more (180 degree peel) after heating and vulcanizing at 80 ° C for 10 to 60 minutes, which is the adhesive strength that can withstand peeling by fingertips and does not separate even under severe use conditions of the tire. . In the case of a rubber-based adhesive layer containing a vulcanizing agent, vulcanization progresses during storage or distribution at room temperature, etc. to reduce tack, and the label is removed from the separator or the green tire is removed. Temporary adhesion is reduced and it becomes less practical.

[0011]

Example of Constituent Elements of the Invention The bar code label of the present invention is for adhering to a rubber tire, and a plastic ink containing a white filler and having a melting point of 200.degree. In the exposed state, the thermal transfer bar code is composed of a rubber adhesive adhesive layer containing a vulcanization accelerator on the other surface of the plastic film via a primer layer and containing no vulcanization agent.

An example of the bar code label of the present invention is shown in FIG. 1 is a thermal transfer bar code made of resin-based ink, 2
Is a plastic film containing a white filler, 3 is a primer layer, and 4 is a rubber-based adhesive layer. In addition, 5 is a rubber tire as an adherend.

Therefore, the label base material is in the state before the thermal transfer bar code is applied to the bar code label as illustrated in FIG. In FIG. 2, 21
Is a matt surface for applying a barcode, and 6 is a separator. The separator is provided to protect the rubber-based adhesive layer from being contaminated by dust or the like until it is temporarily attached to the green tire, and is provided as necessary.

As the plastic film, a plastic film having a melting point of 200 ° C. or higher is used in view of heat resistance during vulcanization. Examples thereof include polyamide, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyphenylene ether, polyphenylene sulfide, polyarylate,
Examples of the film include polymethylpentene and polyamideimide. Film thickness is 100-150μ
m, especially 120 to 130 μm is preferable. Its thickness is 10
If it is less than 0 μm, it may be deformed by heat during vulcanization.
If it exceeds 0 μm, when the label is adhered to the bead portion, it may cause air leakage of the tire when it wears out.

Examples of white fillers contained to whiten the plastic film include oxide type ceramics such as silica, titania (titanium white), alumina, zinc white, calcium oxide and mica, or ceramics obtained by oxidation. Examples of the carbonates, nitrates, sulfates and the like. The content of the white filler is generally 90% by weight or less, preferably 50% by weight or less, particularly 1 to 30% by weight, and the visible light reflectance is 75% or more, particularly 80% or more, particularly 90%. The above film is preferable.
In the present invention, a white titanium terephthalate film containing titanium white can be preferably used from the viewpoint of non-falling property due to a strong adhesive force with the rubber layer.

The primer layer is provided for the purpose of improving the adhesive force between the plastic film and the rubber-based adhesive layer, particularly the adhesive force after vulcanization. Examples of the primer include a mixture of resorcinol and formaldehyde, phenol, resorcinol, pyrogallol, p-
A mixture of toluenesulfonic acid, chlorophenol, resorcinol, formaldehyde, and a latex of an organic compound such as vinylpyridine or SBR is preferably used. Above all, a chlorophenol primer mixed with RFL (resorcinol, formaldehyde, latex) is preferable. In that case, the amount of RFL used is appropriately determined according to the effect of improving the adhesive strength, etc., but generally 100 parts by weight or less, especially 5 to 80 parts by weight, especially 10 to 100 parts by weight of chlorophenol. 50 parts by weight are used. The composition of RFL is 1 / based on R / F / L.
Weight ratios of 0.5 to 2/2 to 10 are common.

The thickness of the primer layer formed on the surface of the plastic film on which the rubber-based adhesive layer is provided is 1 to 50 μm.
m, especially 2 to 30 μm, especially 5 to 20 μm. The primer layer can be formed by an appropriate method such as a known coating method or impregnation method using a kiss coater or a doctor blade.

The rubber-based pressure-sensitive adhesive layer is formed of a rubber-based composition containing a vulcanization accelerator and containing no vulcanizing agent, from the viewpoints of adhesive strength with a tire, storability before practical use and the like. The composition is
For example, 100 parts by weight of a rubber-based polymer such as natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, butyl rubber, 20-50 parts by weight of tackifier,
It is prepared as a mixture of 1 to 5 parts by weight of a vulcanization accelerator.

Graft type rubber is preferably used from the viewpoint of strong adhesion to the tire. Further, natural rubber is preferably used from the viewpoint of temporary adhesion to a green tire and the like, and in particular, a graft rubber in which 5 to 30% by weight of the natural rubber is used in combination is preferable. If necessary, an antioxidant such as a phenolic compound may be blended in an amount of 1 to 5 parts by weight per 100 parts by weight of the rubber component for the purpose of improving storage stability.

Examples of tackifiers include terpene-based resins, rosin-based resins, hydrogenated rosin-based resins and glycerin esters thereof, coumarone-indene-based resins, terpene-phenol-based resins, alkylphenol-based resins, aliphatic-based and aromatic-based resins. Appropriate materials such as known materials such as petroleum resins can be used, and the same applies to vulcanization accelerators.
Above all, as a tackifier, a petroleum resin-based tackifier is preferably used from the viewpoint of temporary adhesion to a green tire, and as a vulcanization accelerator, from the viewpoints of curability and improvement of adhesive strength by vulcanization treatment, etc. Those of the system are preferably used.

The thickness of the rubber-based adhesive layer is 10 to 50 μm,
Especially 15-30 micrometers is preferable. If the thickness is less than 10 μm, the temporary adhesion to the green tire may be poor,
If the thickness exceeds 50 μm, the amount of glue protruding may increase during label processing.

The rubber-based adhesive layer is formed by diluting the rubber-based composition with an organic solvent as necessary and then using a fan film method, a comma roll method, a doctor blade method, a calendar roll method, a gravure roll coater method, or the like. It can be performed by an appropriate method such as a method of coating on the primer layer or a method of transferring the rubber-based adhesive layer coated on the separator.

The matte treatment at least on the side of the plastic film on which the bar code is provided preferably has a surface roughness: Ra of 0.1 to 0.5 μm, especially 0.15 to 0.3 μm. If the Ra is less than 0.1 μm, the depth of the ink flow may be insufficient and the mold contamination may be significant, and if it exceeds 0.5 μm, clear thermal transfer may be difficult due to the unevenness. The surface roughness based on Rmax is preferably 1 to 4 μm, more preferably about 2 μm. The mat processing is, for example, a blast method using a sand mat,
Appropriate surface-roughening treatment methods such as a matting agent coating method and a kneading matting method can be used.

The label can be formed by applying a heat transfer bar code to the mat-treated surface of the plastic film. The application of the thermal transfer barcode can be easily performed by a system using a commercially available thermal transfer printer and a resin-based ink ribbon.

The resin-based inks include, for example, polyester-based, polyamide-based, acrylic-based, polycarbonate-based, phenol-based resins, among others, thermoplastic polyimide, polyether ether ketone, polyether sulfone, polyether imide, A roll mill or one or more heat resistant resins such as polysulfone, polyphenylene sulfide, polyamide imide, polyester imide, aromatic polyamide, polyparabanic acid, fluororesin or epoxy resin and one or more colorants are used. Examples thereof include those prepared by mixing with an appropriate kneading machine such as a pot mill, if necessary, using a solvent to prepare a paste-like fluid.

As the colorant, for example, an appropriate one such as an organic or inorganic pigment, carbon or metal powder is used. Specific examples thereof include organic pigments such as azo pigments, phthalocyanine pigments, triphenylmethane pigments, metal complex salt pigments, vat dye pigments, quinacridone pigments and isoindolinone pigments.

Examples of inorganic pigments include chromium oxide, cobalt oxide, iron oxide, manganese oxide and chromate,
Black substances such as permanganate, manganese oxide / alumina, chromium oxide / tin oxide, iron oxide, red substances such as cadmium sulfide / selenium sulfide, cobalt oxide, zirconia / vanadium oxide, chromium oxide / divanadium pentoxide, etc. Blue products, yellow products such as zirconium / silicon / praseodymium, vanadium / tin, chromium / titanium / antimony, green products such as chromium oxide, cobalt / chromium, alumina / chromium, pink products such as aluminum / manganese, iron / silicon / zirconium. The thing is mentioned as a typical example.

For forming a bar code, black ink such as carbon or black pigment is particularly preferable from the viewpoint of contrast. The ink ribbon required for thermal transfer is formed by, for example, holding an ink containing 50 to 500 parts by weight of a coloring agent per 100 parts by weight of a resin component on a supporting base material such as a film or a cloth by a coating method or an impregnation method. can do. As the supporting base material, a plastic film such as polyethylene terephthalate, polyimide or fluororesin, or a cloth made of fibers such as polyamide or polyester is usually used.

The ink ribbon that can be preferably used in the present invention has an ink layer having a thickness of 1 to 3 μm, especially about 2 μm. If the thickness of the ink is less than 1 μm, the hiding power of the background color by the ink may be poor, and if it exceeds 3 μm, the ink layer may be sheared and good thermal transfer may not be performed, and a good barcode may not be formed.

The bar code label of the present invention is applied in a step of vulcanizing a green tire for forming rubber tires for various uses such as automobiles and aircrafts, and the thermal transfer required for individual management of the tires. A bar code is attached to a label base material to form a label, and the label is temporarily attached to an appropriate position such as a bead portion of a green tire, and the like.
It can be performed by a method such as heat vulcanization at 180 ° C. for 10 to 60 minutes. As a result, the rubber-based adhesive layer of the label absorbs the vulcanizing agent in the green tire through the vulcanization process of the green tire and is vulcanized and cured via the vulcanization accelerator in the adhesive layer, so that it cannot be peeled off with your fingertips. Good adhesion,
Normally, it adheres to the tire with an adhesive force (180 degree peeling) of 3 kg / cm or more, and it can withstand the severe conditions of use of the tire and does not come off.

Therefore, it is possible to issue a bar code label in the tire production process, input individual information for each tire, and then sort the tires by vehicle type, manufacturer, etc. in the subsequent production process and distribution process. Therefore, management of each tire in the process from production to distribution can be performed in the entire industry including other manufacturers and dealers.

[0032]

【Example】

Example 1 One side of which is blasted with a sand mat to have a thickness of 125 μm
On the other side of the white titanium terephthalate film containing titanium white, a primer is applied by a doctor blade method and dried at 160 ° C. for about 2 minutes to form a primer layer having a thickness of 10 μm. It was applied by a doctor blade method and dried at 120 ° C. for about 5 minutes to attach a rubber-based adhesive layer having a thickness of 20 μm, which was covered with a separator and wound up to obtain a label substrate.

The above-mentioned primer is 100 parts by weight of chlorophenol-based primer (Valka Bond E, manufactured by ICI) (parts by weight, the same applies hereinafter), 4.1 parts of resorcinol, 3.6 parts of formaldehyde, vinylpyridine latex (41 parts by weight of solid content). %) 47.4 parts, SBR latex (solid content 40% by weight) 11.7 parts, and 5% by weight caustic soda solution 6.4 parts uniformly mixed with 26.8 parts of soft water. In addition, the above-mentioned graft rubber-based composition was prepared by uniformly adding 85 parts of graft rubber, 15 parts of natural rubber, 35 parts of petroleum-based resin, 4 parts of chulam-based vulcanization accelerator, and 3 parts of phenol-based antioxidant to 200 parts of toluene. It consists of dissolved substances.

The above label base material was cut into a size of 60 mm × 200 mm, and a bar code was printed on the mat-treated surface using a commercially available thermal transfer printer and a ribbon of polyester ink, and the size was further cut into a size of 12 mm × 45 mm. Then, the bar code label for rubber tires was obtained.

Example 2 A bar code label for a rubber tire was obtained in the same manner as in Example 1 except that a label base material having a rubber adhesive layer formed of a graft rubber composition containing no natural rubber was used.

Comparative Example 1 A bar code label for a rubber tire was obtained in the same manner as in Example 1 except that a label base material having no primer layer was used.

Comparative Example 2 A bar code label for rubber tires was obtained in the same manner as in Example 1 except that a label base material made of a white polyethylene terephthalate film which was not matted was used.

Evaluation Test The separator was peeled off from the bar code labels for rubber tires obtained in the Examples and Comparative Examples, and the rubber-based adhesive layers were used to temporarily adhere to the beads of automobile green tires, and the surface finish was 10 to 15S. It was put in the mold of No. 1 and vulcanized at 175 ° C. for 15 minutes.

Mold Contamination The obtained tire was taken out from the mold, and the condition of contamination of the mold with ink was visually judged.

PCS PCS of bar code on label adhered to tire
(Print contrast signal) was measured. PCS
Is calculated by the formula: (white background reflectance-black character reflectance) / white background reflectance. PCS of 0.75 or more in barcode standard
Is required. The more ink is taken into the mold (contamination), the thinner the bar code and the lower the PCS.

Adhesion Strength The force required to peel the label from the tire was measured with a Tensilon tester (180 degree peel, peeling speed 50 mm /
Minutes).

The above results are shown in Table 1.

[Table 1]

[0043]

According to the present invention, a bar code can be flexibly applied by a thermal transfer method and a bar code label can be issued at any time at a production site or the like, and the bar code label is temporarily attached to a green tire without an overcoat, and an ink is printed. A label that is vulcanized while preventing mold contamination due to transfer and blurring of the applied bar code, and is firmly adhered to the tire without thermal deformation such as misalignment or wrinkles and withstands peeling by fingertips. Can be formed. Therefore, it is possible to issue a barcode label that enables individual management for each tire in the production or distribution process at a production site or the like.

[Brief description of drawings]

1 is a cross-sectional view of an example label

FIG. 2 is a sectional view of an example of a label base material.

[Explanation of symbols]

 1: Thermal transfer barcode consisting of resin-based ink 2: White filler-containing plastic film 21: Matte treated surface 3: Primer layer 4: Rubber-based adhesive layer 5: Tire 6: Separator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Zenzo Honda 1-2-2 Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Denko Corporation (72) Inventor Isao Okazaki 1-1, Shimohozumi, Ibaraki City, Osaka Prefecture No. 2 Nitto Denko Corporation

Claims (3)

[Claims] 1. A melting point of 200 ° C. containing a white filler.
The matte-treated one side of the above plastic film has a heat transfer barcode formed of a resin-based ink in an exposed state, and the vulcanizing agent contains a vulcanization accelerator through a primer layer on the other side of the plastic film. A bar code label for a rubber tire, which has a rubber-based adhesive layer containing no rubber. 2. A melting point of 200 ° C. containing a white filler.
One side of the above plastic film has a rubber-based pressure-sensitive adhesive layer containing a vulcanization accelerator through a primer layer and containing no vulcanization agent, and the other side of the plastic film is in a matte-treated state. Label base material characterized by. 3. The plastic film having a thickness of 100 to
The thickness of the primer layer is 150 μm, the primer layer is a treatment layer of a mixture of chlorophenol, resorcinol, formaldehyde, and an organic compound latex, and the rubber-based adhesive layer has a thickness of 10 to 10 with petroleum resin-based tackifier and turum-based vulcanization accelerator as components. The surface roughness of the mat treatment is 0.1 to 0.5 μm based on Ra.
Or the label or label substrate according to 2.