JP2003126911A - Label to be baked on aluminum - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a label to be baked on aluminum which gives bar code information at job sites as circumstances require, is easily attached to a flexible aluminum coil such as a rolled foil, etc., is baked through a heating process for aluminum coil and enables an automatic control by enduring heat treatments thereafter. SOLUTION: This is a label to be baked on an aluminum coil (4) to be sent to heat treatments has an adhesion layer (2) on the back of a label base material (1). On the surface of the material, an ink accepting layer (11) is situated with a mixture of at least inorganic powder and polyorganosiloxane in a sheet shape, supplies an ink information (3) to the ink accepting layer, and is sent to the heat treatments after being temporarily stuck to a part of the coil with a temperature below 150 deg.C through the adhesion layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a baking label for Al, which can form a baking label excellent in hiding power or reflectance and is suitable for forming a management label for a rolling process of an aluminum coil.

[0002]

2. Description of the Related Art Conventionally, as a management label in a rolling process of an aluminum coil or the like, a metal plate coated with a heat resistant coating or laser-etched has been known. This is intended to enable automatic management, which is difficult with a management method of handwriting heat-resistant chalk. However, in the case of a label made of a metal plate, it is necessary to take measures such as riveting when attaching it to an aluminum coil, which causes a problem of poor workability of attachment and a problem that is difficult to apply to a flexible material such as a rolled foil. There was a point.

[0003]

The present invention provides bar code information and the like on the spot, and can be easily attached to a flexible aluminum coil such as a rolled foil. The problem is to develop a baking label for Al that can be used for baking and can withstand the subsequent heat treatment for automatic management.

[0004]

The present invention is a label which is printed on an aluminum coil which is subjected to heat treatment, and has an ink receiving layer formed by holding a mixture of at least inorganic powder and polyorganosiloxane in a sheet form on the surface. Has a pressure-sensitive adhesive layer on the back surface of the label base material, and ink information is given to the ink receiving layer, and is temporarily attached to the portion of the coil below 150 ° C. via the pressure-sensitive adhesive layer for heat treatment. The present invention provides a baking label for Al, which is provided.

[0005]

EFFECTS OF THE INVENTION According to the printing label for Al according to the present invention, various kinds of flexible labels can be flexibly formed at the site by giving ink information to the ink receiving layer by a thermal transfer method. Is temporarily attached to a portion of 150 ° C. or lower such as a tail portion of an aluminum coil through an adhesive layer, so that it can be adhered well to a curved surface portion and the like, and can be printed as a baked label in which the added information is well preserved under heat treatment. It has excellent workability in mounting. In addition, the fired label that is formed has a property that the silica produced by changing the polyorganosiloxane by firing is sintered to strongly bind and hold the inorganic powder, and has excellent chemical resistance, heat resistance, weather resistance, reflectance, etc. It can be used as a management label that can withstand various heat treatments in the processing of aluminum coils. Put on the above 1
If the ink is temporarily adhered to a portion exceeding 50 ° C., bubble swelling may occur at the adhesive interface and foaming may occur during firing, and the applied ink information may become unclear.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The baking label for Al according to the present invention comprises:
A label that is printed on a heat-treated aluminum coil. An ink-receptive layer formed by holding a mixture of at least inorganic powder and polyorganosiloxane in the form of a sheet is adhered to the back surface of the label substrate. Having a layer and providing ink information to the ink receiving layer,
The coil is temporarily attached to a portion of the coil having a temperature of 150 ° C. or lower via the adhesive layer and subjected to heat treatment. An example thereof is shown in FIG. 1 is a label substrate (ink receiving layer), 2 is an adhesive layer,
Ink information 3 is given to the ink receiving layer 1. In the illustrated example, the baking label 3 for Al is attached via the adhesive layer 2 thereof.
The state where the aluminum coil 4 is temporarily attached is shown. In such a label, the organic component such as the adhesive layer disappears by firing, and the label is burned on the aluminum coil.

[0007] The label base material may be one in which the ink receiving layer is in the form of a sheet and is located on at least one surface.
Therefore, the label base material can be formed in an appropriate form. By the way, examples thereof include a form composed of the ink receiving layer itself as in the example of FIG. 1 and a form in which the ink receiving layer 11 is reinforced by a reinforcing base material 12 as in the example of FIG.
The reinforcing form may be a method of providing an ink receiving layer on the reinforcing substrate as shown in FIG. 2, a method of impregnating the reinforcing substrate with an ink receiving layer forming material, a method of interposing a reinforcing substrate in the ink receiving layer, or the like. It may be formed by any method. As the reinforcing base material, an appropriate material such as a resin coating layer, a film, a fiber, and a perforated base material such as cloth or nonwoven fabric can be used.

The reinforcing base material may be formed of a material such as a polymer made of polyester, polyimide, fluororesin or polyamide, which disappears during the heat treatment, or may disappear by the heat treatment such as glass, ceramic or metal. It may be formed of a material that does not. A preferred reinforcing base material is a low-temperature decomposition type polymer such as ethyl cellulose, which is composed of a polymer coating layer or film having excellent tensile strength. The thickness of the reinforcing base material can be appropriately determined, but from the viewpoint of the reinforcing effect, the disappearance due to firing, the seizure property of the fired body, etc., 1 to 100 μm, especially 3 to 50 μm, especially 5 to 25 μm.
Is preferred.

The inorganic powder used for forming the ink receiving layer is
Improved heat resistance (usually less than about 600 ° C, preferably about 80 ° C)
0 ° C. or less) to form the background color of the fired label. Therefore, as the inorganic powder, an appropriate powder such as metal powder or ceramic powder can be used. The particle size of the inorganic powder is 50μ
It is generally m or less, preferably 0.05 to 20 μm, but not limited to this. It should be noted that it is effective to improve the reflectance or the hiding power (the hiding of the ground color of the aluminum coil) by adhering the inorganic powder to a flaky matrix such as mica and blending it as a flake powder.

Examples of commonly used inorganic powders include:
White materials such as silica, titania, alumina, zinc white, zirconia, calcium oxide, mica, potassium titanate, and aluminum borate are listed. Other examples include metal compounds such as carbonates, nitrates, and sulfates that are oxidized at a temperature not higher than the firing temperature to form an oxidized white ceramic. In particular, those having needle-like crystal substances such as potassium titanate and aluminum borate can be preferably used from the viewpoint of whiteness and sintering strength.

Further, red substances such as manganese oxide / alumina, chromium oxide / tin oxide, iron oxide, cadmium sulfide / selenium sulfide, blue substances such as cobalt oxide, zirconia / vanadium oxide, chromium oxide / divanadium pentoxide, and chromium oxide.・ Cobalt oxide, iron oxide, manganese oxide and chromate,
Black substances such as permanganate, yellow substances such as zirconium / silicon / praseodymium, vanadium / tin, chromium / titanium / antimony, green substances such as chromium oxide, cobalt / chromium, alumina / chromium, aluminum / manganese / iron /
Examples of the inorganic powder include pink substances such as silicon and zirconium.

As the polyorganosiloxane, it is possible to use an appropriate polysiloxane which has various organic groups such as methyl groups and phenyl groups, and the organic groups are eliminated by firing to form a silica-based ceramic. In particular, from the viewpoint of its ceramicization, a monofunctional M unit represented by the general formula: R ₃ SiO— and a tetrafunctional Q unit represented by Si (O—) ₄ are formed. Polymers (MQ resins) are preferred. As the MQ resin, for example, an appropriate one known as a tackifier of a silicone-based adhesive can be used.
In the above general formula, R is, for example, an aliphatic hydrocarbon group such as a methyl group, an ethyl group or a propyl group, an aromatic hydrocarbon group such as a phenyl group, an organic group such as an olefin group such as a vinyl group, or a vidroxyl group. It may be a compound group having an appropriate structural unit such as a hydrolyzable group.
The polyorganosiloxane that can be preferably used is excellent in shape retention.

The ink-receiving layer or the label substrate is formed, for example, by using one of inorganic powder and polyorganosiloxane, respectively.
One or two or more kinds are mixed with a ball mill etc. using an organic solvent etc. if necessary, and the mixed solution is spread by an appropriate method and dried on a supporting material such as a reinforcing base material or a separator if necessary. It can be carried out by a method such as. In that case, the ratio of the inorganic powder and the polyorganosiloxane to be used can be appropriately determined according to the handleability and strength of the label base material, the strength and hiding power of the baked label, and the like. From the viewpoint of compatibility between the degree of coloring such as white after sintering and the strength, polyorganosiloxane 10
It is preferable to use 1 to 500 parts by weight, especially 10 to 200 parts by weight, and especially 30 to 70 parts by weight of inorganic powder per 0 parts by weight.

An appropriate organic solvent can be used as the above-mentioned organic solvent according to need. Generally, toluene, xylene, butyl carbitol, ethyl acetate, butyl cellosolve acetate, methyl ethyl ketone, methyl isobutyl ketone, etc. are used. The mixed solution is preferably, but not limited to, prepared so that the solid content concentration is 5 to 85% by weight from the standpoint of spreadability and the like. In the preparation, appropriate additives such as a dispersant, a plasticizer, and a combustion improver can be added if necessary.

The method of developing the mixed solution is arbitrary, but a method such as a doctor blade method or a gravure roll coater method which is excellent in layer thickness controllability is preferable. It is preferable to perform a sufficient defoaming treatment such as by using an antifoaming agent together so that no bubbles remain in the spreading layer. The thickness of the label substrate or ink receiving layer to be formed can be appropriately determined, but is generally 5 μm to 5 mm, preferably 10 μm to 1 mm, and particularly 20 to 200 μm.

In forming the ink receiving layer, for the purpose of improving flexibility, shape retention, chemical resistance and ink fixing property,
For example, silicone rubber, cellulosic polymer, hydrocarbon polymer, vinyl or styrene polymer, acetal polymer, butyral polymer, acrylic polymer, polyester polymer, urethane polymer or fibrin polymer, various waxes or waxes. If necessary, an organic compound such as the above can be blended. Such compounding agents may be used alone or in combination of two or more.

In order to improve flexibility and chemical resistance, it is preferred to use silicone rubber in combination. Any appropriate silicone rubber may be used without any particular limitation. Various modified silicone rubbers such as phenol-modified products, melamine-modified products, epoxy-modified products, polyester-modified products, acrylic-modified products and urethane-modified products can also be used. Silicone rubber that can be preferably used is excellent in shape retention and flexibility.

The amount of the silicone rubber used is preferably 1 to 1000 parts by weight, more preferably 5 to 500 parts by weight, especially 10 to 200 parts by weight, per 100 parts by weight of the polyorganosiloxane, from the viewpoint of improving chemical resistance. When silicone rubber is used in combination, the proportion of the above-mentioned inorganic powder used is based on the total amount of polyorganosiloxane and silicone rubber in terms of handleability and strength of the printing sheet, strength of the fired label and hiding power. preferable.

On the other hand, it is preferable to use a cellulose-based polymer such as ethyl cellulose in combination from the viewpoints of the ink fixing property by the thermal transfer system, the strength improvement of the label substrate, and the baking property by baking. The amount of the above-mentioned organic compound such as a cellulosic polymer other than the silicone rubber used is 1 to 1000 per 100 parts by weight of the polyorganosiloxane, and in the case of using the silicone rubber in combination, per 100 parts by weight thereof.
The amount is generally 20 to 200 parts by weight, especially 40 to 150 parts by weight, but is not limited thereto.

The label base material can also be made into a porous form for the purpose of smooth volatilization of decomposed gas by heating. By the way, if an adhesive layer for temporary wearing is provided, the sheet may swell due to decomposition gas due to heating, which can be prevented by using a porous label base material. The porous label base material is formed by an appropriate method such as a method of forming a large number of fine holes in the label base material by a punching method or the like, and a method of using a perforated base material such as woven cloth or non-woven cloth as the reinforcing base material. be able to.

Since the baking label for Al is to be temporarily attached to an aluminum coil to be heat-treated, and to be fired and label-bonded under heat treatment, it is adhered by baking as shown in the figure. Layer 2 is provided. The adhesive layer is
An ink receiving layer is provided on the label substrate 1 so as to be exposed on the surface. For forming the adhesive layer, a suitable adhesive substance such as a rubber-based, acrylic-based, silicone-based, or vinyl alkyl ether-based adhesive can be used. The attachment of the adhesive layer is a method of applying an adhesive substance on a predetermined surface of the label substrate by an appropriate coating method such as a doctor blade method or a gravure roll coater method, or an adhesive layer provided on the separator according to the above. Can be carried out by an appropriate method such as a method of transferring to a predetermined surface of the label base material.

Further, the adhesive layer may be provided in a scattered state by an appropriate coating method such as a rotary screen method for the purpose of smooth vaporization of decomposition gas during heat treatment. The thickness of the adhesive layer can be determined according to the purpose of use of the aluminum coil. The thickness is generally 1 to 500 μm, especially 3 to 100 μm, and particularly 5 to 50 μm. It is preferable that the provided adhesive layer is covered with a separator 21 or the like to prevent contamination or the like until it is temporarily attached to the aluminum coil, as in the example of FIG. In addition to the manual attachment of the Al baking label to the aluminum coil,
An automatic bonding method using a robot or the like can also be adopted.

When temporarily attached to an aluminum coil to be heat-treated, the Al baking label is a label provided with ink information, and the label is temporarily attached to a portion where the temperature of the coil tail or the like is 150 ° C. or lower. Be worn. The label can be formed by applying the ink information 3 to the ink receiving layer of the label substrate 1 as in the example of FIG. In addition to the ink information, the label may be a composite of appropriate information elements such as engraving information consisting of holes or irregularities and shape information obtained by punching a sheet into an appropriate shape. Ink information can be added by various printing methods such as a handwriting method, a coating method using a pattern mask, and a pattern transfer method provided on a transfer paper. A method of giving ink information by a method is preferable.

As the ink for forming the ink information, a colorant such as a pigment, and particularly an appropriate one using a heat resistant colorant such as an inorganic type can be used, and the fixing power is improved by heat treatment. For the purpose, a glass frit or the like may be contained. Ink information obtained by thermal transfer can be provided by using a thermal transfer printer and an ink sheet, and thus arbitrary ink information can be provided flexibly, accurately, and efficiently. In addition, a label provided with the thermal transfer ink information is temporarily adhered to a predetermined temperature portion of the aluminum coil through the adhesive layer and subjected to a firing treatment, so that the applied information such as the thermal transfer ink information is well preserved as a fired label. Can be baked on aluminum coil.

The above-mentioned ink sheet can be obtained, for example, by adding a binder to the ink and holding it on a supporting base material such as a film or cloth. Therefore, thermal transfer ink information can be formed by using a known ink or an ink sheet thereof by a thermal transfer method or the like. From the viewpoint of heat resistance and the like, the ink sheet is preferably a metal oxide type colorant made of an oxide of an appropriate metal such as iron, nickel, chromium, cobalt or copper, and a wax or resin for holding the colorant. Ink containing the appropriate organic binder as a component is used. Above all, a resin-based ink using a resin as a binder of a colorant can be preferably used from the viewpoint of clarity of applied information after firing.

The ink information to be given to the ink receiving layer is arbitrary, and for example, appropriate ink information such as print information, a picture pattern, a bar code pattern or the like may be given according to the purpose of use. A bar code identification method is advantageous for management labels and the like. When an identification label such as a management label is formed, it is preferable that a good contrast or a difference in color tone is formed between the baked sheet and the ink information after the heat treatment.

The heat treatment of the label temporarily attached to the aluminum coil can be carried out under appropriate heating conditions depending on the heat resistance of the aluminum coil. Generally 1200 ° C
Hereinafter, the heating temperature is 200 to 700 ° C., especially 350 to 600 ° C. While the organic component such as the adhesive layer disappears by the heat treatment, the polyorganosiloxane or the like forming the ink receiving layer becomes ceramic while being compatible with the ink information,
It is fired and labeled, and it is baked and fixed to an aluminum coil.

Therefore, the baking label for Al is used for painting various aluminum coils such as slabs and rolled foils,
It can be preferably used for various purposes such as coloring or color-coded information or identification marks such as barcodes,
In particular, it can be preferably used for the construction of an automatic management system as a management label for aluminum coils of various thicknesses used in the rolling process.

[0029]

Example 1 100 parts of MQ resin (parts by weight, the same applies hereinafter), 17 parts of silicone rubber having a weight average molecular weight of about 300,000 (all manufactured by Shin-Etsu Chemical Co., Ltd.), potassium titanate (manufactured by Otsuka Chemical Co., Ltd.) 6
0 parts and 60 parts of ethyl cellulose (manufactured by Hercu1es) are homogeneously mixed with toluene, and the dispersion is applied onto a polyester film having a thickness of 75 μm by a doctor blade method and dried to form an ink receiving layer having a thickness of 70 μm. Was formed to obtain a label base material.

On the other hand, a toluene solution containing 100 parts of polybutyl acrylate having a weight average molecular weight of about 1,000,000 was applied by a doctor blade method to a separator made of glassine paper having a thickness of 70 μm treated with a silicone release agent and dried. To form a pressure-sensitive adhesive layer having a thickness of 15 μm, which was adhered to the surface of the ink receiving layer and the polyester film was peeled off to obtain a baking label for Al.

Then, the thermal transfer ink information consisting of a bar code is applied to the ink receiving layer of the printing label for Al by using an ink ribbon holding a resin ink containing a metal oxide type black pigment and a thermal transfer printer. After making it into a label, it is temporarily attached to the tail portion of the aluminum coil with a temperature of 150 ° C with a hand roller via the adhesive layer,
A heat treatment was performed at 530 ° C. for 12:00 and baked.

Example 2 A baking label for Al and a label were obtained in the same manner as in Example 1 except that aluminum borate was used instead of potassium titanate, and it was baked on the tail of an aluminum coil.

Comparative Example 1 A baking label for Al and a label were obtained in the same manner as in Example 1 except that silica powder (Aerosil) was used in place of the MQ resin, and this was baked on the tail portion of the aluminum coil. .

Comparative Example 2 A baking label for Al and a label were obtained in the same manner as in Example 1 except that silicone rubber was used in place of the MQ resin, and the label was baked on the tail portion of the aluminum coil.

COMPARATIVE EXAMPLE 3 The label was temporarily attached to the aluminum coil tail portion 1
Baking was performed according to Example 1 except that the temperature was 80 ° C.

Evaluation Test In the above Examples and Comparative Examples, when the label was temporarily attached to the aluminum coil, it was examined whether or not the label could be applied uniformly without bulging. In addition, the firing strength of the fired label obtained by the baking treatment, which has ink information consisting of a black bar code on a white background, was evaluated for sintering strength by a picking test using a cellophane adhesive tape, and the presence or absence of bubbles visually. I checked. Furthermore, the reflectance was evaluated with a bar code verifier. In the examples, the above-mentioned baking treatment burned out the ethyl cellulose of the label substrate and the organic components in the adhesive layer. Further, in the fired label, the MQ resin and / or the silicone rubber was changed to silica and remained as a ceramic.

The above results are shown in the following table. Example 1 Example 2 Comparative example 1 Comparative example 2 Comparative example 3 Laminating property Good Good Good Good Poor Sintering strength No change No change Fracture No change No bubble No No Yes Yes Yes Reflectivity (%) 80 50 80 80 80

[Brief description of drawings]

FIG. 1 is a sectional view of an example of a printing label for Al.

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

[Explanation of symbols] 1: Label base material (11: Ink receiving layer 12: Reinforcing base material) 2: Adhesive layer 3: Ink information 4: Aluminum coil

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Okazaki Isao             Nittoden 1-2, Shimohozumi, Ibaraki City, Osaka Prefecture             Within Kou Co., Ltd. F-term (reference) 2H111 CA03 CA05 CA31

Claims (4)

[Claims] 1. A label group to be printed on a heat-treated aluminum coil, wherein an ink receiving layer formed on a surface of a mixture of at least a mixture of inorganic powder and polyorganosiloxane has a shape of a sheet, and the label group is located on the surface. An adhesive layer is provided on the back surface of the material, ink information is provided to the ink receiving layer, and the coil is temporarily attached to the portion at 150 ° C. or lower via the adhesive layer for heat treatment. Baking label for Al characterized by 2. The baking label for Al according to claim 1, wherein the polyorganosiloxane contains MQ resin, and a portion of the aluminum coil at 150 ° C. or lower is a tail portion. 3. The printing label for Al according to claim 1, wherein the ink information applied to the ink receiving layer is a thermal transfer of a resin ink. 4. The printing label for Al according to claim 1, wherein the ink information applied to the ink receiving layer is a bar code, and the aluminum coil subjected to the heat treatment is used in the rolling step.