JPH08207427A - Tape for label writer - Google Patents

Abstract

PURPOSE: To easily produce a label having excellent environmental resistances such as abrasion resistance and water resistance by providing an ink accepting layer made of a boehmite on a tape-like base material and further laminating a silica gel layer on the ink accepting layer. CONSTITUTION: A tape for label writer capable of printing by an ink jet method has an ink accepting layer 2 made of a boehmite (Al2 O3 .nH2 O, n=1-1.5) on a tape-like base material 1 and further has a silica gel layer 3 laminated on the ink accepting layer. On the rear face of the base material 1, a mold release paper 5 is laminated through an adhesive layer 4. The ink accepting layer 2 is preferably made of a boehmite particle which is bonded by an organic binder. It is also preferable that a pore structure substantially consists of pores wherein a radius of each pore is 1-10nm and a pore volume is 0.3-1.0cc/g. Thus, by using the boehmite for the ink accepting layer 2, ink absorbing property and fixation property of a pigment in an ink can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label writer tape, and more particularly to a label writer tape which can be printed by an ink jet system.

[0002]

2. Description of the Related Art A device called a label writer is known as a device for printing a label to be attached to a document or the like. A conventional label writer prints on a tape-shaped label base material by a thermal transfer method, and by combining a label base material of various colors and an ink ribbon, labels of various color arrangements can be produced. With this method, the label substrate and the ink ribbon must be replaced each time the color of the label is changed. further,
In the case of realizing full color, there is a problem that the consumption of the ink ribbon increases and the cost increases.

[0003]

On the other hand, the ink jet system is suitable as a recording system for a label writer because it can easily realize full color and is excellent in cost and image clarity. In case of inkjet method,
The label substrate requires high ink absorption. further,
As the label, scratch resistance, environment resistance such as water resistance is required, but since the image is formed by the solvent-soluble dye in the inkjet method, the water resistance and weather resistance of the recorded matter are not always sufficient. Absent. In general, labels often come into contact with hands, and may be exposed to rain when used outdoors, and may be exposed to water or detergent when used for tableware, etc. High environmental resistance is required.

According to the present invention, it is possible to easily produce a label which is capable of forming an image having excellent resolution and color developability and which is excellent in environmental resistance such as scratch resistance and water resistance by the ink jet method. An object of the present invention is to provide a label base material for a label writer, that is, a label writer tape.

[0005]

The present invention provides a tape for a label writer, which comprises a tape-like substrate, a boehmite ink receiving layer, and a silica gel layer laminated on the ink receiving layer.

The material of the substrate is not particularly limited, and various materials can be used. Specifically, various plastics such as polyester resins such as polyethylene terephthalate, polycarbonate resins, and fluorine resins such as ETFE can be preferably used. Furthermore, natural paper, synthetic paper, cloth or a composite material thereof can be used. These substrates may be subjected to treatments such as corona discharge treatment and undercoat for the purpose of improving the adhesive strength of the ink receiving layer.

When a transparent plastic film or the like is used as the substrate and a highly transparent ink receiving layer is used, a transparent label can be obtained. When an opaque plastic film containing a white or other color pigment or paper is used as the substrate, a white or colored label can be obtained. Even if the substrate is opaque, it is preferable that the transparency of the ink receiving layer is high because printing with high color density is possible.

Since the ink receiving layer formed on the substrate is made of boehmite (Al ₂ O ₃ .nH ₂ O, n = 1 to 1.5), it has good ink-jet ink absorbency and ink. Excellent fixability of the dye inside. A configuration in which boehmite particles are bound with an organic binder is preferable.

The boehmite ink-receiving layer has a pore structure of pores having a radius of substantially 1 to 10 nm and a pore volume of 0.3 to 1.0 cc / g. It is preferable because it has properties and is transparent. In addition to these physical properties, it is further preferable that the average pore radius of the boehmite layer is 3 to 7 nm. Incidentally, the measurement of the pore size distribution,
By nitrogen adsorption / desorption method.

As a method of forming the ink receiving layer, a method of applying a coating liquid in which a boehmite particle is preferably added with a binder to a substrate is preferable. For example, alumina sol is preferably added with a binder to form a slurry, which is coated on a substrate using a die coater, roll coater, air knife coater, blade coater, rod coater, bar coater, comma coater, etc. It is preferable to adopt it.

As the binder, polyvinyl alcohol and its modified products, starch and its modified products, styrene-butadiene rubber (SBR) latex, nitrile-butadiene rubber (NBR) latex, hydroxycellulose, polyvinylpyrrolidone and other organic substances can be used. If the amount of the binder used is too small, the strength of the ink receiving layer may be insufficient. On the other hand, if the amount is too large, the amount of ink absorbed or the amount of dye carried may be low. About wt% is preferable.

If the thickness of the ink receiving layer is too thin, the dye cannot be sufficiently carried and a label having a low color density may be obtained, which is not preferable. On the other hand, if the thickness is too large, the strength of the ink receiving layer may be reduced, or the transparency may be reduced to impair the texture, which is not preferable. The preferable thickness of the ink receiving layer is 1 to 50 μm.

A silica gel layer is provided on the ink receiving layer. This silica gel layer allows ink to penetrate into the ink receiving layer when recorded by an inkjet method, has good transparency, and allows the ink fixed on the ink receiving layer to be observed from above. is necessary.

The thickness of the silica gel layer is preferably about 0.1 to 30 μm. If the thickness of the silica gel layer is less than 0.1 μm, the mechanical strength of the silica gel layer is insufficient, and the effect of protecting the ink receiving layer may be insufficient, which is not preferable. If the thickness of the silica gel layer exceeds 30 μm, the transparency of the silica gel layer may be insufficient and the color density of the image may decrease, which is not preferable.

The silica gel layer is preferably formed by forming an ink receiving layer, applying silica sol together with a binder and then drying. The silica sol has an average particle size of 10 to 90 nm and a solid content concentration of 1 to 20.
Weight% is preferable. As the binder, the same binder as used for forming the ink receiving layer can be used. Particularly, a silicon-containing polymer is preferable. The amount of the binder used is preferably 1 to 30% by weight based on the solid content (SiO ₂ ) of silica gel. If the amount of the binder used is less than 1% by weight, the mechanical strength of the silica gel layer may be lowered and the effect of protecting the ink receiving layer may be insufficient, which is not preferable. When the amount of the binder used exceeds 30% by weight, the ink absorbency and the ink permeability of the silica gel layer are insufficient and the ink is hard to be fixed on the ink receiving layer, which is not preferable.

The coating method of the silica sol coating solution is not particularly limited, and a die coater, roll coater, air knife coater, blade coater, rod coater, bar coater, gravure coater, etc. can be used.

In the tape of the present invention, it is preferable that an adhesive layer is formed on the back side of the recording surface, that is, the back side of the surface on which the ink receiving layer and the silica gel layer are formed, and a release paper is further laminated. In this case, the tape can be stored in a cartridge in a wound form, and after the tape after printing is cut, the release paper can be peeled off and attached to a desired place. The thickness of release paper is 10 ~ 200
μm is preferred. When the thickness of the release paper is less than 10 μm, it becomes difficult to remove the release paper. On the contrary, when the thickness exceeds 200 μm, the total thickness of the tape becomes large, and the length of the tape that can be stored in the cartridge is short. Therefore, it is not preferable.

The width of the tape can be appropriately selected according to the size of the desired label, but is generally 5 to 50 m.
m is suitable. In the manufacturing process, it is preferable to cut a sheet having a width larger than this into a tape. This tape is preferably wound into an appropriate diameter, placed in a cartridge made of resin or the like, and attached to a label writer.

An example of a cross section of the label writer tape of the present invention is shown in FIG. In FIG. 1, an ink receiving layer 2 is formed on a tape-shaped substrate 1, and a silica gel layer 3 is further laminated on it. The pressure-sensitive adhesive layer 4 and the release paper 5 are laminated on the back surface thereof.

[0020]

【Example】

Example 1 A coating solution was prepared by mixing 100 g of an alumina sol having a solid content of 18% by weight synthesized by the hydrolysis / peptization method of aluminum alkoxide and 32 g of a 6.2% by weight aqueous solution of polyvinyl alcohol. This coating liquid was applied onto a polyethylene terephthalate film (white film, thickness: 38 μm) using a die coater so that the coating amount after drying was 25 g / m ² . This was dried and then heat treated at 140 ° C. to form a porous boehmite layer.

On this boehmite layer, a silica sol coating liquid containing silica particles having an average primary particle diameter of 20 nm and a silicon-containing polymer and having a solid content of 5% by weight is applied and dried so that the coating thickness after drying is 3 μm. And further dried at 140 ° C.

Next, an adhesive layer was formed on the side where the boehmite layer was not formed, and a release paper having a thickness of 75 μm was laminated thereon. As a result, a sheet that can be adhered to the adherend by peeling off the release paper is obtained. This sheet, width 15
The tape was cut into a tape having a length of 10 mm and wound up to obtain a label writer tape. This tape can be printed using an inkjet printer, and then cut to an appropriate length and peeled off from the release paper to be applied as a label at a desired place.

Example 2 A label writer tape was obtained in the same manner as in Example 1 except that the thickness of the silica gel layer was changed to 5 μm. It is possible to print using an inkjet printer, and then cut to an appropriate length and peel off the release paper to attach it as a label at a desired place.

[0024]

The label writer tape of the present invention is capable of high-quality printing by the ink jet system, is excellent in quick-drying property and color development, and can be adapted to full-color printing.
Furthermore, since the ink receiving layer is covered with the silica gel layer, a label having excellent environmental resistance such as scratch resistance, water resistance, weather resistance, solvent resistance, stain resistance, and the like can be produced. Therefore, the obtained label has storage stability that maintains high image quality for a long period of time. It is particularly suitable for recording using a water-based ink.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of an example of a label writer tape of the present invention.

[Explanation of symbols]

 1: Tape-shaped substrate 2: Ink receiving layer 3: Silica gel layer 4: Adhesive layer 5: Release paper

Claims (2)

[Claims] 1. A label writer tape comprising a tape-shaped substrate, a boehmite ink receiving layer, and a silica gel layer laminated on the ink receiving layer. 2. The label writer tape according to claim 1, wherein the printing method is an ink jet method.