JPH0752357A - Plate cylinder for printing for thick paper - Google Patents

Abstract

PURPOSE:To obtain a plate cylinder for printing for thick paper which prevents breakage and creasing of stencil paper, attains saving of printing ink and dispenses with cleaning of the printing ink. CONSTITUTION:A metal roll 2 for printing, a resin film layer 3 provided on the outer peripheral surface of the metal roll 2 for printing, an ink holding layer 4 made of felt which covers the outer peripheral surface of the film layer 3 and contains and stores printing ink, and stencil paper 5 which is so provided as to cover the outside of the ink-holding layer 4 and of which the back sheet is made of paper, woven fabric or the like, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing plate cylinder most suitable for thick paper such as corrugated paper.

[0002]

2. Description of the Related Art Conventionally, a plate cylinder for printing corrugated cardboard and other thick paper has a cylindrical structure having a rigid structure with a length of about 2000 cm and a diameter of about 30 cm on which a rubber plate or a resin plate is mounted. A method is known in which printing ink is applied to and transferred to the surface of a printed matter. Further, as a plate cylinder for printing on thin paper used for posters, conference materials, etc., printing ink is supplied from the inside as disclosed in, for example, Japanese Utility Model Publication No. 59-229. A cylindrical roll having a rigid structure having holes, and a synthetic resin layer having an open cell structure arranged on the outer periphery of the cylindrical roll,
A stencil printing cylinder having a woven cloth arranged to cover the outer side of the synthetic resin layer is known.

[0003]

However, in the plate cylinder having the above structure, when the printing base paper is mounted and printing is performed, as will be described later, a press roller interposes a non-woven fabric or a non-woven fabric through the printing paperboard and the printing base paper. Since strong pressure is applied to the synthetic resin layer with an open cell structure, these are deformed, and unnecessary unnecessary force is also applied to the printing board, which may damage the base paper for printing or cause wrinkles. There were problems such as. Further, when printing a larger number of types of ink, there is a problem that the printed printing ink must be cleaned each time.

The present invention has been made in view of the above circumstances, and it is necessary to prevent damage and wrinkles of the base paper for printing mainly in the case of printing for thick paper, and to save the print ink and also to clean the print ink. The purpose is to provide a printing plate cylinder that does not have a printing plate.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a resin-based film layer disposed on the outer peripheral surface of a printing metal roll, and a printing method coated on the outer peripheral surface of the film layer. An ink containing layer made of felt or the like containing ink, and a stencil printing base paper made of paper or woven fabric provided on a back sheet so as to cover the outside of the ink containing layer. Preferably, in order to save the printing ink, the resin-based film layer disposed on the outer peripheral surface of the printing metal roll, and the printing ink coated on the outer peripheral surface of the film layer are circulated and supplied. An ink supply layer made of foamed plastic or the like, an ink containing layer made of felt or the like that covers the outer peripheral surface of the ink supplying layer and contains a printing ink, and a back so as to cover the outside of the ink containing layer. On the sheet A stencil printing base paper made of or made of woven fabric is disposed, and a stencil printing base paper supports a stencil, a non-woven fabric layer or a woven fabric layer, and a PET film layer or saran film having a large number of pores corresponding to characters and patterns. A stencil composed of layers.

[0006]

Before starting printing, a film layer, an ink containing layer containing printing ink, a non-woven fabric layer or a woven fabric layer supporting a stencil, and a P layer are formed on the outer peripheral surface of a printing metal roll.
A stencil printing base paper consisting of a stencil having a large number of holes formed by a photothermal body by drawing characters and patterns on an ET (polyethylene terephthalate) film layer or saran film layer,
After setting on the clamper, the metal roll for printing is rotated to print on the printing board.

[0007]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic explanatory view showing one embodiment of a printing apparatus provided with a plate cylinder according to the present invention, and FIG. 2 is a fragmentary enlarged sectional view showing an embodiment of a first plate cylinder according to the present invention. FIG. 3 is a fragmentary enlarged cross-sectional view showing an embodiment of the second plate cylinder according to the present invention. FIG. 4 is a fragmentary enlarged cross-sectional view of a stencil printing cylinder showing a conventional example, in which a large number of holes 61 are provided in the cylindrical roll 21 to allow the printing ink sent from the inside to pass to the outside. Of. 12 is a synthetic resin layer,
13 is a woven cloth. The printing apparatus of the present invention includes a cylindrical plate cylinder 1 having a predetermined width, and the cylindrical plate cylinder 1 rotates about its central axis C _{1 in} a counterclockwise direction by an electric motor (not shown). Being driven. Further, there is a base paper mounting clamper 7 for locking the mounting ears of the stencil printing base paper 5 and the like on a part of the outer periphery of the cylindrical plate cylinder 1, and the mounting ears are locked to the base paper mounting clamper 7. The stencil printing base paper 5 and the like are held in close contact with the outer peripheral surface of the cylindrical plate cylinder 1 and rotate integrally with the cylindrical plate cylinder 1. The cylindrical plate cylinder 1 is covered with a resin film layer 3 so that the printing ink does not adhere to the printing metal roll 2. Further, a relatively thick felt-like ink containing layer 4 is provided on the outer peripheral surface of the film layer 3 to retain water and to store printing ink. If the ink containing layer 4 and the film layer 3 are of a cartridge type, they can be easily stored and can be used many times at a later date, which is convenient. Further, on the outside of the ink containing layer 4, a stencil 52 consisting of a PET (polyethylene terephthalate) film layer or a saran film layer having a large number of holes 6 corresponding to characters and patterns punched by a photothermal material is formed. And a stencil printing base paper 5 comprising a non-woven fabric layer or a woven fabric layer 51 for supporting the stencil 52. The film layer 3, the ink containing layer 4, and the stencil printing base paper 5 are integrally formed,
Set on the base paper mounting clamper 7. Next, a press roller 8 is rotatably provided on the outer peripheral surface of the cylindrical plate cylinder 1 so as to face the cylindrical plate cylinder 1, and the outer peripheral surface of the cylindrical plate cylinder 1 is rotated by a spring force or the like (not shown). It is pressed flexibly toward. Although not shown, the printing board 11 for printing is stacked on a paper feed table, and is picked up one by one by a paper feed roller, and is paired with a timing roller 9 to form an outer periphery of the cylinder plate cylinder 1 at a predetermined time. Sent between the stencil printing base paper 5 and the press roller 8 mounted on the surface,
The printing ink that has passed through the holes 6 of the stencil printing base paper 5 when passing through this interval is transferred, and after printing is completed, it is placed on a paper discharge table (not shown). The printing ink in the ink containing layer 4 attached to the cylindrical plate cylinder 1 is distributed uniformly on the outer peripheral surface of the ink containing layer 4 in the generatrix direction thereof. It passes through the holes 6 of the printing base paper 5 and is transferred to the surface of the printing board 11. Further, by disposing the ink supply layer 12 made of a relatively thick foamed plastic or the like between the film layer 3 and the ink containing layer 4, the press roller 8 is provided.
The printing ink pressed by is circulated and always remains in the ink supply layer 12, so that the printing ink is saved and clear printing can always be performed, which is more effective.

[0008]

As is apparent from the above description, the present invention has the following practically excellent effects. (1) Since a resin PET (polyethylene terephthalate) film layer or a saran film layer is used as a stencil on the stencil printing base paper and a non-woven fabric layer or a woven fabric layer is arranged to support the stencil printing base paper, the stencil printing base paper It is convenient because it does not break or wrinkle. (2) Since the cylindrical plate cylinder is covered with the film layer, the printing metal roll does not become dirty, and therefore the printing ink changes,
It is practical because it saves the trouble of cleaning each time. (3) By using the film layer and the ink containing layer as a cartridge, it can be stored and can be used many times at a later date, which is very economical. (4) The film layer, the ink containing layer and the stencil printing base paper,
Since it can be sized according to each printing paperboard, it is economical because it does not require capital investment, space, etc. as compared with the conventional one. (5) It is efficient because printing of various sizes can be easily performed by only storing one sheet of base paper. (6) Since the ink supply layer is provided, the printing ink is saved, and a clear printing board is always obtained, which is more effective.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a printing apparatus including a plate cylinder according to the present invention.

FIG. 2 is a fragmentary enlarged sectional view showing an embodiment of a first plate cylinder according to the present invention.

FIG. 3 is a fragmentary enlarged sectional view showing an embodiment of a second plate cylinder according to the present invention.

FIG. 4 is a fragmentary enlarged sectional view of a stencil printing cylinder showing a conventional example.

[Explanation of symbols]

 1 ... Cylindrical plate cylinder 2 ... Printing metal roll 21 ... Cylindrical roll 3 ... Film layer 4 ... Ink containing layer 5 ... Stencil printing base paper 51 ... Nonwoven layer or woven layer 52 ... Stencil 6 ... Hole 61 ... Hole 7 ... Clamper for mounting base paper 8 ... Press roller 9 ... Timing roller 10 ... Guide roller 11 ... Printing paperboard 12 ... Ink supply layer 13 ... Synthetic resin layer 14 Woven cloth

Claims (3)

[Claims] 1. A resin-based film layer disposed on the outer peripheral surface of a printing metal roll, and an ink containing layer made of felt or the like coated on the outer peripheral surface of the film layer and containing printing ink, A printing plate cylinder for thick paper, characterized in that a stencil printing base paper made of paper or woven fabric is arranged on the back sheet so as to cover the outside of the ink containing layer. 2. An ink supply layer comprising a resin-based film layer disposed on the outer peripheral surface of a printing metal roll, and a foamed plastic or the like coated on the outer peripheral surface of the film layer to circulate and supply the printing ink. And an ink containing layer made of felt or the like that covers the outer peripheral surface of the ink supply layer and contains printing ink, and a back sheet made of paper or woven fabric so as to cover the outside of the ink containing layer. A printing plate cylinder for thick paper, characterized in that a stencil printing base paper is provided. 3. The stencil printing base paper comprises a non-woven fabric layer or a woven fabric layer for supporting the stencil, and a stencil comprising a PET film layer or a saran film layer having a large number of pores corresponding to characters, patterns and the like. Or a printing plate cylinder for thick paper according to 2.