JPH0677991B2 - Paper dust removal sheet used in corrugated board printing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paper dust removing sheet used in a corrugated board printing machine for printing corrugated cardboard sheets, and includes foreign matter such as paper dust which is an obstacle in printing the corrugated cardboard sheets. The present invention relates to a paper dust removing sheet used in a corrugated board printing machine capable of completely and smoothly performing printing by removing the above.

(B) Conventional technology High-speed printing of about 200 sheets per minute is currently used for printing corrugated cardboard sheets, but if paper dust or the like adheres to the surface of the corrugated cardboard sheet, these can be used as printing plates. Adhering to the surface, a large amount of defective printed matter is generated due to white spots on the printed surface, plate mess, plate clogging, etc., and a large amount of money is wasted for stopping the printing machine, inspection, reworking of printed matter, etc. Many.

Various methods have been devised for a method for removing paper dust or the like adhering to a cardboard sheet, but a perfect and effective method has not yet been found.

That is, as a method that is generally used at present, a method of installing a suction removal device for paper dust or the like by air suction in the paper feeding department of a corrugated board printing machine is used, but there is a cost for exhaust equipment. In addition, when paper dust or the like is charged with static electricity and adheres to the surface of the corrugated board, it cannot be completely removed.

On the other hand, on the other hand, a soft rubber sheet having adhesiveness is attached to the surface of the plate cylinder of the printing machine instead of the rubber plate,
There is also a method of pressing against the cardboard sheet surface to remove paper dust, etc.
It is difficult to obtain a thin adhesive plate-shaped rubber sheet of m or less, and since a plate cylinder is used for this purpose, there are many drawbacks such as the need to use the printing unit to remove paper dust and the like. It was

In addition to this, for example, as disclosed in Japanese Utility Model Laid-Open No. 62-30771, an adhesive rubber roll is used to remove dust adhering to the surface of the plate-like body in printing or the like, or such an adhesive rubber roll is used. In order to prevent the adhesiveness of No. 1 from being lowered for a while, a technique has been known in which a cleaning roll having a stronger adhesiveness is pressed against this adhesive rubber roll to transfer dust to improve cleaning efficiency.

(C) Problems to be Solved by the Invention However, in the above-mentioned negative pressure suction method for paper powder, there is a problem of high cost and incomplete removal of dust due to a separately provided device, and therefore the adhesive sheet is applied to a printing machine. In the method of mounting on the plate cylinder of, there is a problem with the performance of the pressure-sensitive adhesive sheet and it is necessary to temporarily stop printing because of the use of the plate cylinder.In addition, the adhesive rubber roll should be combined with the cleaning roll for transfer. Up to now, there is a problem that the cost becomes extremely high because one device separate from the printing machine is required.

The present invention has thus been studied as to the pressure-sensitive adhesive sheet which has the lowest cost and can be improved among the conventional techniques and the optimum use of the pressure-sensitive adhesive sheet.

An object of the present invention is to provide a paper dust removing sheet for use in a corrugated board printing machine, which can perform excellent paper dust removal without requiring a structural improvement in the printing machine.

(D) Means for Solving the Problems The present invention provides a paper dust removing sheet for use in a corrugated cardboard printing machine, which is attached to a feed roll in contact with the printing surface side of the corrugated cardboard sheet in order to achieve the above object. , Polyester film is coated with UV-curable polyurethane resin to form a total thickness of about 0.2 mm, and it is made adhesive by UV irradiation, and its surface hardness is
I took the measure of setting it in the range of 20-40 degrees.

The UV-curable polyurethane resin itself may be a known one, and naturally, the thickness thereof does not necessarily need to be 0.2 mm exactly, and the object of the present invention can be achieved as long as it is a numerical value in the vicinity thereof. .

(E) Action When this paper dust removing sheet is wrapped around a feed roll that is in contact with the printing surface side of a corrugated cardboard sheet, for example, with a double-sided adhesive tape, the paper dust of the corrugated cardboard sheet that passes through this feed roll is an ultraviolet curable type. It is transferred to the paper dust removing sheet side by the adhesiveness of the polyurethane resin.

At this time, since the surface strength of the paper dust removing sheet is in the range of 20 to 40 degrees, the function of the feed roll, which requires elasticity of the main body, is not impaired.

Further, the paper dust removing sheet composed of the above-mentioned ultraviolet-curable polyurethane resin and polyester film is sufficient even though it can be obtained with a thickness of about 0.2 mm which is sufficiently thin to be attached to the existing feed roll. It has sufficient mechanical strength and sufficient tackiness to adhere paper dust, and the tackiness can be easily restored by washing and removing the paper dust.

(F) Example Hereinafter, the present invention will be specifically described with reference to the drawings.

1 (a), (b), (c), and (d) are examples of various printing machines for corrugated cardboard sheets, the feed rolls shown in A and B in the figure are interlocked with a kicker device. Then, it is a roll that sends the corrugated board sheets one by one to the printing unit, but in order to remove the attached paper dust etc. just before entering the printing process, contact the entire surface of the corrugated board sheet or a specific part necessary for printing. The position of this roll is most suitable as a place to do, and further, if the surface hardness of the resin film for removing paper dust and the like mounted on the surface of the roll is set within the range of 20 to 40 degrees, the elasticity is There is no fear of impairing the function as a feed roll that requires the.

Further, in order to effectively remove the paper dust and the like, it has a function of lightly contacting the surface of the corrugated cardboard sheet, picking up the paper dust and the like due to its adhesiveness, and cleaning the surface to be printed. ,
It is necessary to have sufficient durability for practical use.

For this purpose, the present inventors have tested the rubber plate having adhesiveness, polyvinyl chloride, nylon, acrylic, polyurethane and many other resins, as a result, among them, the most dust removal effect, and It has sufficient mechanical strength such as abrasion resistance, and also has excellent recovery of tackiness and excellent life of the film. A tackified film was found.

This UV-curable special polyurethane resin film not only has a mechanical strength enough to withstand use even with a thin film of 0.2 mm, for example, but also has extremely excellent properties as described below. is there.

Next, a specific example of the paper dust removing sheet will be described in detail below.

UV curable special polyurethane resin liquid (31) (APR, F46 manufactured by Asahi Kasei Kogyo Co., Ltd.) is cast on a polyester film (32), squeegeeed to a thickness of 0.2 mm, and irradiated with a UV lamp to completely cure the resin. A film (3) having a tackiness immediately before is prepared.

The resin film (3) is wound around the surface of the roll (A in the figure) corresponding to the printing surface of each feed roll shown in FIG. 1, and for example, a double-sided adhesive tape is used as shown in FIG. 2 (b). And stick it.

Using a printing machine equipped with a feed roll that has a resin film for removing paper dust, etc.
After printing the cardboard sheet using the liner,
All paper dust on the sheet is removed on the adhesive film surface 3000
Even after printing one sheet, white spots and plate clogging due to paper dust did not occur, while a large amount of paper dust was deposited on the surface of the feed roll to which the resin film was attached.

The sticky paper powder was recovered by washing with water, that is, just wiping it with a cloth moistened with water, and the adhesiveness was restored. When printing was restarted, the same effect as the first effect was obtained.

As a result of repeated use experiments over a long period of time, the effect of removing paper dust and the like could be maintained for 6 months in normal operation.

It should be noted that the adhesive film does not need to be removed even when the action of removing paper dust or the like is unnecessary, and it does not hinder the use of normal printing at all, and the effect of removing paper dust and the like can be obtained by washing with water only when necessary. Is to demonstrate.

Incidentally, the UV-effect type special polyurethane resin used in the present invention is usually used as a cured product in a printing plate, but it cannot be used for printing in the state of maintaining the tackiness required in the present invention. Needless to say.

(G) Effect of the Invention According to the paper dust removing sheet used in the corrugated board printing machine of the present invention, the UV-curable polyurethane resin and the polyester film have a sufficiently thin adhesive strength and mechanical strength, Because of this thinness, it can be installed using the existing feed roll of the corrugated board printing machine (without causing the crushing of the cardboard sheet), and inexpensive and effective paper dust removal can be performed for a long period of time (adhesion by washing with water) It has had a remarkable effect of restoring sex.

[Brief description of drawings]

1 (a), (b), (c), and (d) are cross-sectional example views of various printing machine units for corrugated board sheets. FIG. 2A is a sectional view of a feed roll, FIG. 2B is a sectional view of an adhesive film for removing paper dust and the like, and FIG. 2C is a perspective sectional view of the adhesive roll adhered to the feed roll. In the figure, A ... Feed roll (contact with printing surface) B ... Feed roll C ... Plate cylinder D ... Impression cylinder E ... Printing plate F ... Inking unit 1 ... Corrugated cardboard sheet 2 ... Feed roll 3 …… Paper dust removal film 31 …… Adhesive urethane film 32 …… Polyester film 4 …… Double-sided tape

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Claims (1)

[Claims] 1. A paper dust removing sheet for use in a corrugated board printing machine, which is attached to a feed roll contacting the printing surface side of a corrugated board sheet, which is obtained by applying an ultraviolet curable polyurethane resin onto a polyester film. As a paper dust removing sheet for use in a corrugated board printing machine, which has a thickness of approximately 0.2 mm, is made to be tacky by irradiation with ultraviolet rays, and has a surface hardness in the range of 20 to 40 degrees.