JPS63218359A - Paper powder removing method for corrugated cardboard sheet - Google Patents

Abstract

PURPOSE:To improve removing efficiency of paper powder, by applying a specific polyurethane resin maintaining viscous state onto the surface of a feed roll for corrugated cardboard printer. CONSTITUTION:Ultraviolet ray hardening-type specific polyurethane resin liquid 31 is fed onto a polyester film 32 then irradiated by an ultraviolet ray lamp, so as to produce a film 3 in viscous state where the resin is just before beginning a complete curring set complete. Then the resin film 3 is wound over the surface of a roll A corresponding to the print face of each feed roll and sticked thereto with both side adhesive tape, for example. When a printing machine which is mounted with a feed toll applied with a resin film for removing paper power is employed for printing of a corrugated cardboard, paper powder on the sheet is transferred entirely to the adhesive film face, thereby whitening or clogging of plate due to paper powder does not occur even after printing of many sheets and a large quantity of paper powder accumulates on the surface of the feed roll applied with resin film. Viscosity of paper powder is recovered through washing with water.

Description

DETAILED DESCRIPTION OF THE INVENTION (AL Industrial Field of Application) This invention relates to a method of printing corrugated cardboard sheets, and is a method for completely and smoothly printing by removing impurities such as paper dust that become an obstacle when printing corrugated cardboard sheets. It is about an efficient way to do so.

(b) Conventional technology Corrugated sheets are currently printed at high speeds of around 200 sheets per minute, but if there is paper dust etc. attached to the surface of the corrugated sheet, these particles may interfere with the printing plate. It adheres to the surface and causes a large amount of defective prints due to white spots on the printing surface, plate dust, plate jams, etc., and a large amount of money is wasted due to stopping the printing press, inspecting the product, and reworking the prints. many.

Although various methods have been devised to remove paper dust and the like from cardboard sheets in advance, a complete and effective method has not yet been found.

In other words, the current common method is to install an air suction device to remove paper dust, etc. in the paper feed section of a corrugated board printing machine. In addition, if paper dust or the like is charged with static electricity and adheres to the surface of the cardboard, it cannot be completely removed.

On the other hand, a soft adhesive rubber sheet is attached to the surface of the printing press cylinder instead of the rubber plate.
There is also a method of pressing against the surface of a cardboard sheet to remove paper dust, etc., but the removal ability is weak due to the material, and 1
It is difficult to obtain a thin sticky plate-like rubber sheet with a thickness of less than m, and since a plate cylinder is used for this purpose, the printing unit has to be used to remove paper dust, etc., and there are many other disadvantages. Ta.

(C) Problems to be solved by the invention This invention solves the drawbacks of the prior art as described above, improves the removal efficiency of paper dust, etc., does not reduce the efficiency of the printing machine, and removes paper dust, etc. This work was completed with the aim of providing a new method for removing paper dust from corrugated cardboard sheets, which can easily activate efficiency and extend the life of the removal mechanism.

(Means for Solving the dJ Problems and Their Effects) This invention involves wrapping a special polyurethane resin film with adhesiveness around the surface of the feed roll that comes into contact with the printing surface of a corrugated board printing machine, and adhering it to the surface of the corrugated board sheet. It is characterized by removing paper dust, etc.

The present invention will be specifically described below based on the drawings.

Figures 1 (a), (b), (c), and (d) are separate views of various types of printing machines for corrugated cardboard sheets, and the feed rolls shown in A and B in the figures are interlocked with the kinker (kicking) device. The roll that feeds the corrugated sheets one by one to the printing unit touches the entire surface of the corrugated sheet or a specific part necessary for printing in order to remove attached paper dust, etc. just before entering the printing process. The position of this roll is the most suitable place to remove paper dust, etc., and if the surface hardness of the resin film for removing paper dust etc., which is attached to the surface of the roll, is set within the range of 20 to 40 degrees, the elasticity will be improved. There is no risk of impairing the function as a feed roll that requires

In addition, in order to effectively remove paper dust, etc., it is necessary to lightly touch the surface of the corrugated pole sheet and use its adhesiveness to pick up paper dust, etc., and to clean the printing surface. However, it is necessary to have sufficient sustainability for practical purposes.

For this purpose, the present inventors conducted tests on adhesive rubber plates, polyvinyl chloride, nylon, acrylic, polyurethane, and many other resins, and found that among them, the resin had the highest dust removal effect. It also has sufficient mechanical strength such as abrasion resistance, and has excellent adhesive restoration and film life, and is suitable for the surface of ultraviolet curable special polyurethane resin films, as shown in the examples below. A film has been found that has excellent adhesive properties.

This ultraviolet curable special polyurethane resin film not only has sufficient mechanical strength to withstand use even if it is as thin as 0.2 m, but also
It has a combination of extremely excellent properties as described below.

+1111 Example Ultraviolet curable special polyurethane resin liquid (31) (APR, F46, specially made by Asahi Kasei Industries) is poured onto a polyester film (32) to a thickness of 0.2 mm with a squeegee and irradiated with an ultraviolet lamp to completely coat the resin. A film (3) in a state of adhesiveness immediately before being cured is prepared.

This resin film (3) is wrapped around the surface of the roll (A in the figure) corresponding to the printing surface of each feed roll shown in Figure 1 using double-sided adhesive tape, for example, as shown in Figure 2 (b). etc. and paste it.

Using a printing machine equipped with a feed roll attached with a resin film for removing paper dust, etc., 220 g
When printing on corrugated cardboard sheets using the liner, all the paper dust on the sheets was removed onto the adhesive film surface, and even after printing 3,000 sheets, there were no white spots or plate jams due to paper dust, etc. On the other hand, a large amount of paper dust was deposited on the surface of the feed roll to which the resin film was attached.

By simply rinsing the sticky paper dust with water, that is, wiping it off with, for example, a cloth dampened with water, the stickiness was restored, and when printing was resumed, the removal effect was exactly the same as the initial effect.

As a result of repeated use experiments over a long period of time, the removal effect of paper dust etc. could be maintained for 6 months under normal operation.

Furthermore, even when the removal action of paper dust, etc. is not required, the adhesive film does not need to be removed, and there is no problem in normal printing use, and the effect of removing paper dust, etc. can be improved by washing with water only when necessary. It is something that demonstrates the.

The cured product of the ultraviolet curable special polyurethane resin used in the present invention is usually used in printing plates, but it cannot be used for printing while maintaining the adhesiveness required for the present invention. Needless to say.

ff) Effects of the Invention The method for removing paper dust, etc. according to the present invention is characterized in that a special polyurethane resin that maintains an adhesive state is adhered to the surface of the feed roll of a corrugated board printing machine. (1) There is no need to modify the corrugated pole printing machine. (2) There is no need to add equipment to the printing machine. (3) There is no need for new energy such as electricity. (4) The current printing machine uses a feed roll method. (5) There is no change in the printing unit, so there is no loss of color, etc. (6) Adhesive strength is immediately restored by wiping with water, and it can be used immediately, eliminating the need for defective waste paper. (7) There is no need to attach or remove the adhesive film even when paper dust etc. does not need to be removed. (8) Since a thin film is attached, the corrugated cardboard sheet will not collapse. (9) After 5 to 6 months. This invention is a novel invention that has many excellent effects, such as being able to replace only the adhesively deteriorated parts.

[Brief explanation of the drawing]

FIGS. 1A, 1B, 1C, and 1D are cross-sectional side views of various printing press units for corrugated cardboard sheets. Figure 2 (a
) shows a cross-sectional view of the feed roll, (b) shows a cross-sectional view of the adhesive film for removing paper dust, etc., and (c) shows a perspective cross-sectional view of the adhesive roll stuck to the feed roll. In the figure A --- one ------feed roll (
Printing surface contact) B--・-------Feed roll C------1---Plate cylinder D----------- ---Impression cylinder E----
−−−−−−−−−One stamp version F−・−−−1−−−−−−
---Inking unit 1--1-----Cardboard sheet 2--------Feed roll 3-- --1 Paper powder etc. removal film 31----------Adhesive urethane film 32-----Polyester film 4-- −−−・・・Double-sided tape patent applicant Osaka Printing Ink Manufacturing Co., Ltd. Man1 x

Claims (1)

[Claims] On the surface of the feed roll on the printing side of the corrugated board printing machine,
A method for removing paper dust from corrugated cardboard sheets, which is characterized by wrapping a UV-curable special polyurethane resin as a film that retains its adhesive properties just before curing.