JPH06248239A - Adhesive tape for fixing screen printing frame - Google Patents

Abstract

PURPOSE:To provide an adhesive tape for fixing a screen printing frame having desired light transmittance and high precision and capable of being economically produced by applying a colored printing to one surface of a plastic film and subsequently forming an adhesive agent layer to the printed surface. CONSTITUTION:The adhesive tape is produced by applying a colored printing to the upper surface of a plastic film 1 so as to lower its whole light transmittance, and subsequently forming an adhesive agent layer 3 on the printed surface 2. The product is preferably produced by applying a 1-2mum thickness gray or silver colored printing to one surface of a 10-60mum thickness polyethylene film to lower the whole light transmittance to 4-90% and subsequently forming a 10-60mum thickness adhesive agent layer. The printing and light transmittance can be controlled by applying a mat processing such as coating mat processing to the opposite surface of the plastic film 1 having a printed surface 2 on one face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive tape for fixing a screen printing frame.

[0002]

2. Description of the Related Art A screen printing original plate is used for printing and then washed with a solvent and water and stored, but an adhesive agent that fixes the screen to a printing frame is used for the above washing and the like. Since it is eroded, a tape is attached on the screen of the printing frame to protect it. This tape is
This is a film formed by laminating an aluminum vapor deposition film and an adhesive layer on one side of a plastic film, which is usually called a silver tape. Since this tape does not transmit light at all, the photosensitive material in the part covered with this tape is not exposed and is not cured even when irradiated with ultraviolet rays when forming the original plate. The uncured photosensitive material may ooze out to contaminate the printing original plate, and also in the case of the above cleaning, the photosensitive material may ooze out by the solvent and water, and also contaminate the printing original plate. It is often seen.

Therefore, the aluminum vapor-deposited film of the above tape is thinned to give some translucency and semitranslucency so that the photosensitive material is cured through the tape at the time of exposure, and at the same time, a concealing function is provided. What you are trying to get is provided. However, in the case of forming the aluminum vapor deposition film, it is easy to make a non-translucent one, but it is not easy to obtain a desired light transmittance, and a large variation occurs in the product, The cost is also high and there are many problems.

[0004]

Therefore, an object of the present invention is to obtain an adhesive tape having a desired light transmittance accurately and economically.

[0005]

According to the present invention, one side of a plastic film is colored and printed, and a pressure-sensitive adhesive layer is formed on the one side of the plastic film, whereby the light transmittance is controlled to a desired ratio and the screen is easily screened. The adhesive tape for fixing the printing frame is obtained. In addition, the surface of the plastic film opposite to the printed surface is matted so that the light transmittance is also controlled.

[0006]

EXAMPLE In the following, an example will be described. Color printing (2) is performed on one side of a plastic film (1). A polyester film is usually used for this plastic film, but a film having a light-transmitting property such as nylon, polypropylene, polyethylene or the like is appropriately used, and a thickness of about 20 μ is standard, and a film of about 10 to 60 μ is usually used. To be When printing on one side of a plastic film, it is printed in an appropriate color so as to reduce translucency,
Generally, it is easy to adjust the translucency by printing in gray or silver, and the appearance is often preferable, similar to the conventional silver tape.

The light transmittance (light transmittance) is adjusted by considering the light transmittances of the plastic film and the pressure-sensitive adhesive layer described below, and by adjusting the type, density, printing thickness, etc. of the printing ink. Make the rate 4-90%. When printing in the gray color, it is common to mix ink pastes of 5 to 6 colors. The thickness of the printing is about 0.5 to 5 μ, and most of the thickness is about 1 to 2 μ. Printing on the plastic film may be gravure printing, offset printing, screen printing, flexo printing, etc., as long as uniform translucency can be obtained, depending on the type of film and printing ink. It can be performed by an appropriate printing method.

A pressure-sensitive adhesive layer (3) is formed on the printing surface (2) of the above-mentioned printed plastic film. The pressure-sensitive adhesive is not only acrylic type but also silicone type, rubber type, etc. for cleaning. Appropriate ones having resistance to solvents and the like used at that time can be used. In addition, this adhesive is usually colorless and transparent, but even if it is colored, if its translucency is taken into consideration as described above,
You can use it freely. The thickness of this pressure-sensitive adhesive layer is about 25 μm as a standard, and it is often good to set it to about 10 to 60 μm. The pressure-sensitive adhesive layer (3) is covered with a release paper (4), but it can be wound if it is provided with a release agent by applying a release agent to the surface of the plastic film (1).

The surface of the plastic film (1) opposite to the printing surface (2) can be matted (5), which causes light scattering and changes translucency. The translucency can be controlled together with the printing. This mat processing is a coating mat processing for coating a mat agent, a kneading mat processing for kneading a mat agent into a film substrate, a blast mat processing for mechanically blast mat processing, and a frame having a mat processing surface. It may be carried out by a casting mat process or other processing method in which the solution is poured on the sheet. Further, matt processing may be performed on the printed surface side as well, whereby the translucency can be further controlled, and the bonding between the layers may be improved.

[Prototype Example] A prototype was prepared as follows, and the light transmittance was measured and compared. (Example 1) Plastic film: One-sided coated matte-processed polyester film, thickness 23 μ (ICI, 38
3/92 g) was used. Printing: Using a plate with a plate depth of 20 μ, gravure printing was performed on the film surface that was not matt-processed with silver ink. Adhesive: An acrylic pressure-sensitive adhesive was uniformly applied to the printing surface to a thickness of 25 μm. (Example 2) A print was prepared in the same manner as in Example 1 except that a plate having a plate depth of 30 µ was used for printing. (Example 3) A print was prepared in the same manner as in Example 1 except that a plate having a plate depth of 40 µ was used for printing. (Example 4) A plastic film was prepared in the same manner as in Example 1 except that a polyester film having a double-sided coated mat and a thickness of 23 µ (377/92 g, manufactured by ICI) was used as the plastic film. (Example 5) A print was prepared in the same manner as in Example 4 except that a plate having a plate depth of 30 µ was used for printing. (Example 6) The procedure of Example 4 was repeated except that a plate having a plate depth of 40 µ was used for printing. (Comparative Example) Plastic film; polyester film, thickness 2
3μ was used. Metal vapor deposition film: A semi-translucent aluminum vapor deposition film was formed on one surface of a polyester film. Pressure-sensitive adhesive: The same acrylic pressure-sensitive adhesive as in each of the above examples was uniformly applied on the aluminum vapor deposition film to a thickness of 25 μm.

(Test / Comparison) (1) Visible Light Transmittance Measurement For each of Examples 1 to 6 and Comparative Example, 10 samples were randomly selected, and the average value of the light transmittance, the minimum value, and the maximum value were selected. I asked. The measuring method was performed according to JIS5759. (2) Production unit price comparison The unit price per m ² of the printed polyester films of Examples 1 to 6 and the aluminum vapor deposition film of Comparative Example were compared.

[0012]

(Discussion) In Examples 1 to 3 of the present invention,
The error of the visible light transmittance is in the range of about ± 5%, and those of Examples 4 to 6 are also in the range of about ± 6%, but it is found that there is a large variation of about ± 15% in the comparative example. . Also,
As for the production unit price, it can be seen that those of Examples 1 to 6 are about half or less as compared with the comparative example. As described above, in this example, it is possible to easily obtain the one having the high light transmittance and the manufacturing cost is low.

[0014]

EFFECT OF THE INVENTION The product of the present invention can be securely fixed by sticking it to a screen printing frame, and can appropriately expose light to the photosensitive material for exposure and curing. The original plate can be surely protected from light by washing and protecting it. Further, a simple method of printing can provide desired light transmittance with excellent accuracy, and can be manufactured economically with low manufacturing cost.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a modified example.

[Explanation of symbols]

 1 plastic film 2 printing layer 3 adhesive layer 4 release paper 5 matte surface

Claims (4)

[Claims] 1. A screen printing frame fixing comprising a plastic film, wherein one surface of the plastic film is colored and printed so as to reduce the overall light transmittance, and an adhesive layer is formed on the printing surface. Adhesive tape for. 2. The adhesive tape for fixing a screen printing frame according to claim 1, wherein a surface of the plastic film opposite to a printing surface is matt-processed. 3. The light transmittance is 4 in terms of visible light transmittance.
The adhesive tape for fixing a screen printing frame according to claim 1 or 2, wherein the adhesive tape is 90% to 90%. 4. The adhesive tape for fixing a screen printing frame according to claim 1, wherein the colored printing applied to the plastic film is silver or gray printing.