JPH07112571A - Printing matter with kind indication - Google Patents

Abstract

PURPOSE:To make it possible to form a small unit number of kind indications easily without damaging the surface on which a pictorial pattern is provided by treating the surface so that it has a specific wet index and further, laminating an offset ink printing layer, in printed matter consisting of a pictorial pattern layer and a polypropylene resin layer laminated sequentially on the surface of a material paper. CONSTITUTION:In printing matter 1 consisting of a pictorial pattern layer 3 and a polypropylene resin layer 4 laminated sequentially on the surface of a material paper, the surface of the polypropylene layer 4 is treated by corona discharge 5 so that the wet index is 38 to 42 dyne, and an offset ink printing layer 6 (e.g. indication of store name, address, etc. Product in small quantities) is laminated on the surface of the polypropylene resin layer 4. Consequently, it is possible to indicate a different kind of a low-production without deteriorating the quality the printing surface. Further, it is possible to obtain the indication of good quality at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset lithographic printing method capable of relatively easily displaying a small number of contents such as the front cover and posters of catalogs.

[0002]

2. Description of the Related Art Conventionally, there is one in which a resin film is laminated in order to protect the printed surface of the covers, posters, calendars, etc. of catalogs in general commercial printed matter. However, although these items have the same pattern, the display of the store name, address, date, etc. may differ by a small number depending on the places used.

Therefore, in order to print a different type display of a small number of units, it is necessary to stop the printing machine and replace the plate each time when the pattern portion is printed and a different type is produced. Therefore, the stop makes the printing state of the offset lithographic printing method unstable, resulting in a decrease in quality and a large number of printing defects. Further, there are drawbacks such as long time and labor and high cost.

Further, when printing a different kind of product without laminating a resin film for surface protection, there is a risk of damaging the surface such as scratches and stains, and the different kind of product display portion is printed separately. There is a method such as sticking a sticker, but
The appearance was spoiled and the cost was high.

For this reason, conventionally, after printing a pattern portion, a resin film for surface protection such as polyvinyl chloride resin or polypropylene resin is laminated, and thereafter, a shop name, an address, a date, etc., which is a different kind display, are printed. However, when the former polyvinyl chloride resin film is laminated, the printing method can be performed by an offset lithographic printing method, but the transfer of the plasticizer contained in the resin film layer causes disadvantages such as show-through and blocking. Further, when the latter polypropylene resin film is laminated, the ink adhesion is poor in the offset lithographic printing method, and therefore the printing method different from the pattern portion printing such as gravure printing or silk printing must be used, resulting in poor productivity. Also, the cost was high.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to print the pattern printing portions collectively and stably, and then store name, address, date. It is an object of the present invention to easily provide a display of a different type of a small number of units such as, without deteriorating the quality such as scratching or soiling the pattern printing surface on the surface.

[0007]

In order to achieve the above object, the different kind of printed matter of the present invention is a printed matter in which a pattern layer and a polypropylene resin layer are sequentially laminated on the surface of a base paper, and the polypropylene resin surface is wetted. The index is 38 to 42 dynes, and an offset ink printing layer is further laminated on the surface.

[0008]

In the present invention, the polypropylene resin layer acts to prevent scratches and stains on the pattern printing layer when printing a small number of different types of products, and the surface is treated so that the wetting index is in the range of 38 to 42 dynes. , Affects offset ink compatibility and anchoring effect.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the layer structure of a different kind of printed matter according to an embodiment of the present invention.

In this embodiment, the different kind of printed matter 1 has a pattern layer 3 formed by offset lithographic printing on the surface of a base paper 2 having a basis weight of 279 g / m ² , and an unstretched polypropylene film 4 having a thickness of 20 μm. Are laminated, and the surface of the unstretched polypropylene film 4 for surface protection is subjected to corona discharge treatment 5, and then offset lithographic printing is used to form a display 6 of different kinds of small units such as store names and addresses.

Here, when the polypropylene film 4 for surface protection is laminated on the surface of the pattern printing layer 3, a heat and pressure laminator is used. This hot-pressure laminator is a well-known one, and a corona discharge treatment device is arranged after laminating. This corona discharge treatment device is composed of an electrode connected to a voltage generator and a metal roll whose surface is spaced apart from the electrode by a minute gap and is covered with a polyester film or the like. A high voltage corona is generated by applying a voltage to activate the film surface fed through the gap. At this time, the degree of treatment of the film surface can be changed by changing the size of the gap, the voltage, the film passing speed, or the like.

In the present invention, the degree of treatment of the surface of the polypropylene resin by corona discharge treatment is set to fall within the range of 38 dynes to 42 dynes. Table 1 shows the test results of the adhesion of the ink and the smoothness of the resin surface with respect to this treatment degree. As shown in this table, when the treatment value is less than 38 dynes, the surface smoothness is good, but the ink adhesion is poor, and when it exceeds 42 dynes, the ink adhesion is poor. Is good but the surface smoothness is poor. Therefore, it is optimal to set this processing rate within the above range. The value of the degree of treatment when the surface is not treated is about 30 dynes. Here, the degree of treatment is judged by applying several kinds of wetting index standard liquids to the surface of the test piece and judging whether or not the liquid repels.

[0014]

[Table 1]

In the above embodiment, the case where the polypropylene resin layer 4 is subjected to corona discharge treatment has been described, but matting treatment may be performed instead of this corona discharge treatment. In that case, a mat-shaped fine unevenness can be formed on the film surface by using an embossing roll having a fine satin-finished unevenness on the surface of the metal roll used in the step of hot-press lamination.

The polypropylene film used as the surface protective layer of the printed matter includes a stretched type film and an unstretched type film, but the film base material has flexibility,
An unstretched type that is excellent in laminating processability and also excellent in heat shrinkage is preferable, and the film thickness is 15 to 2
0 μm is suitable.

Further, as the different kind of display ink,
It may be any one that can be used in a generally known offset lithographic printing method such as an oxidation polymerization type or an ultraviolet curing type.

[0018]

As described above, in the present invention, since the polypropylene resin is laminated on the surface protective layer after the pattern printing, the quality of the state of the printed surface can be maintained even if a small number of different types are displayed. It can be easily installed without damage.

Furthermore, since the surface of the laminated polypropylene resin is subjected to surface treatment such as corona discharge treatment, it is possible to display different kinds of products by ordinary offset lithographic printing. It can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is a layer configuration diagram of a different kind display printed matter according to an embodiment of the present invention.

[Explanation of symbols]

 1 Different type display printed matter 2 Base paper 3 Picture layer 4 Polypropylene resin layer 5 Treatment layer 6 Different type display layer

Claims (1)

[Claims] 1. A printed matter in which a pattern layer and a polypropylene resin layer are sequentially laminated on the surface of a base paper, the polypropylene resin surface having a wetting index of 38 to 42 dynes, and an offset ink printing layer is further laminated on the surface. Different kind display printed matter.