JPH07314877A - Reinforcing sheet for printing film and printing sheet using the same - Google Patents

Abstract

PURPOSE:To eliminate the emission of ultraviolet rays and also the dimension change and the generation of curls at the time of high temperature heating by applying an adhesive mass on one face of a low shrinkable base having the heat shrinkage factor of specified range and forming a reinforcing sheet for a printing film. CONSTITUTION:An adhesive mass is applied on one face of a low shrinkable base having the heat shrinkable factor of 0.5% or less, and a reinforcing sheet for a printing film is formed. Then the reinforcing sheet is stuck on a printing film having the heat shrinkage factor of 0.5% or less to manufacture a printing sheet. To be concrete, a printing film 3 is stuck, on the adhesive mass side of the reinforcing sheet 2, and the reinforcing sheet 2 formed by applying an adhesive mass 12 on one face of a low shrinkable base 11. For the material quality of the low shrinkable base 11, a synthetic resin film such as a polyester film or a polypropylene film paper or the like is used. As for the adhesive mass 12, a rubber or acryl adhesive mass is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is thin (for example, 3 to 75).
The reinforcing sheet is attached to the printing film when printing on the printing film, and the printing sheet in which the reinforcing sheet and the printing film are attached.

[0002]

2. Description of the Related Art Conventionally, when printing on a thin film,
Since it is difficult to print because it is easily wrinkled, printing is performed with the reinforcing sheet attached to the printing film, and after printing, the printing film is peeled off from the reinforcing sheet. As such a reinforcing sheet, for example, a sheet in which an adhesive such as rubber or acrylic is provided on one side of a base material such as polyester film or paper is used. However, recently, UV curable inks and thermosetting inks have been used as the inks used for printing because the printed film is strong and has good abrasion resistance. The laminated printing sheets had problems such as dimensional changes and curling due to ultraviolet irradiation and high temperature heating during printing.

[0003]

DISCLOSURE OF THE INVENTION The present invention uses a UV curable ink or a thermosetting ink, and does not undergo dimensional change or curl even when irradiated with UV rays or heated at a high temperature, and the reinforcing sheet. An object of the present invention is to provide a printing sheet in which a printing film and a printing film are attached.

[0004]

Means for Solving the Problems That is, the present invention is a reinforcing film for printing, characterized in that an adhesive is provided on one surface of a low-shrinkable substrate having a heat shrinkage of 0.5% or less. Provide a sheet for. Further, the present invention provides a printing sheet obtained by laminating this reinforcing sheet and a printing film having a heat shrinkage ratio of 0.5% or less.

The low-shrinkage base material used for the reinforcing sheet in the present invention is one having a heat shrinkage ratio of 0.5% or less, preferably 0.2% or less. Here, the heat shrinkage rate is defined in JIS C-2318. If this heat shrinkage ratio exceeds 0.5%, there are drawbacks such as dimensional change and curling due to ultraviolet irradiation or high temperature heating during printing. The material of the low-shrinkage substrate is not particularly limited as long as its surface is smooth, and examples thereof include synthetic resin films such as polyester film and polypropylene film, and paper. The thickness is not particularly limited, but it is usually preferably about 25 to 250 μm.

The pressure-sensitive adhesive used in the reinforcing sheet is not particularly limited, and examples thereof include rubber-based and acrylic-based pressure-sensitive adhesives. Particularly, after completion of printing, the printing film is reinforced. It is preferable that the sheet can be easily peeled from the sheet.

The reinforcing sheet of the present invention can be obtained by applying a pressure-sensitive adhesive to one surface of the low-shrinkage base material having the above-mentioned specific heat shrinkage rate by coating or the like. The thickness of the pressure-sensitive adhesive layer is not particularly limited here, but preferably 5 to 50 μm.
It is about m.

The present invention also provides a printing sheet by laminating such a reinforcing sheet with a specific printing film. As such a printing film, it is desirable to use a low-shrinkage film having a heat shrinkage rate of 0.5% or less, preferably 0.2% or less, because dimensional change and curling occur. The material of the printing film is not particularly limited as long as its surface is smooth, and examples thereof include synthetic resin films such as polyester film and polyimide film. The thickness is not particularly limited, but is usually preferably about 3 to 75 μm.

[0009]

Embodiments of the present invention will now be described in more detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing an embodiment of a printing sheet according to the present invention. Reference numeral 1 is a printing sheet having a reinforcing sheet 2 and a printing film 3 attached to the pressure-sensitive adhesive surface side of the reinforcing sheet 2. . The reinforcing sheet 2 of the present invention comprises a low shrinkable base material 1
A pressure sensitive adhesive 12 is provided on one surface of No. 1 by coating.
Here, the low shrinkable base material 11 has a heat shrinkage ratio of 0.1.
%, A 75 μm thick polyester film (Tetoron H7A manufactured by Teijin) was used, and as the adhesive 12, an acrylic adhesive was applied to a thickness of 35 μm.
As the printing film 3, a polyester film (Tetron H7A manufactured by Teijin) having a heat shrinkage of 0.1% and a thickness of 25 μm was used.

The obtained printing sheet was subjected to printing with a processing step of ultraviolet irradiation and high temperature heating (150 ° C. × 3 minutes), and as a result, dimensional change and curl of the sheet did not occur at all, and printing was completed. The post-printing film could be smoothly peeled off from the reinforcing sheet.

[0012]

EFFECTS OF THE INVENTION The reinforcing sheet and the printing sheet of the present invention can obtain a good printed product without causing the inconvenience of dimensional change or curling even when subjected to ultraviolet irradiation or high temperature drying in the printing process.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a printing sheet of the present invention.

[Explanation of symbols]

 1 Printing Sheet 2 Reinforcing Sheet 3 Printing Film 11 Low Shrinkable Base Material 12 Adhesive

Claims (2)

[Claims] 1. A reinforcing sheet for a printing film, comprising a low-shrinkable substrate having a heat shrinkage of 0.5% or less and an adhesive provided on one surface thereof. 2. A printing sheet obtained by laminating the reinforcing sheet according to claim 1 and a printing film having a heat shrinkage ratio of 0.5% or less.