JP2020044736A - Antistatic method of printing paper - Google Patents

Abstract

To provide an antistatic method of a printing paper without adding a constitution for preventing static charge to an off-set printing machine.SOLUTION: An antistatic method of a printing paper for solving the above problem is characterized in that a positive ionic hydrophilic group 30 is attached to a blanket cylinder 10 via a cleaning fabric 40. In this method, the attachment of the positive ionic hydrophilic group 30 to the blanket cylinder 10 is completed with cleaning of the blanket cylinder 10 by means of the cleaning fabric 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an antistatic technique for printing paper in an offset printing press.

  Among the offset printing presses, a rotary printing press generates a printed matter as a paper surface by performing processes such as printing, drying, cooling, cutting, and folding on a belt-shaped printing paper (web). Printing paper that goes through such a process is likely to be charged with static electricity due to pulling out from a roll or rubbing. Further, by applying processing such as drying and cooling to such printing paper, the charging property can be further improved. Printing paper that has been charged with static electricity is liable to cause problems such as paper jam due to sticking between paper surfaces and variations in paper alignment in processes such as cutting and folding, and are generally disclosed in Patent Documents 1 and 2. As described above, antistatic measures such as applying fine powder to the cut printing paper or adding moisture are employed.

JP-A-4-80036 JP-A-11-309841

  According to the antistatic measures disclosed in Patent Literatures 1 and 2, it is considered that a great effect can be surely obtained in improving the alignment of the printing paper sent from the rotary printing press. However, in each of the techniques disclosed in Patent Document 1 and Patent Document 2, it is necessary to add a new configuration to prevent the printing paper from being charged. For this reason, there is a problem that the size and cost of the printing press are increased.

  Therefore, in the present invention, an antistatic method for printing paper and a cleaning cloth for realizing the antistatic method, which solves the above problem and does not add an antistatic structure to an offset printing machine, are provided. The purpose is to provide.

  In order to achieve the above object, the antistatic method for printing paper according to the present invention is characterized in that a cationic hydrophilic group is attached to a blanket cylinder via a cleaning cloth.

  Further, in the method for preventing static electricity of a printing paper having the above-described characteristics, it is preferable that the attachment of the cationic hydrophilic group to the blanket cylinder is performed by washing the blanket cylinder with the cleaning cloth. . According to this feature, the attachment of the cationic hydrophilic group to the blanket cylinder can be performed not only with a new configuration but also without increasing new steps.

  Further, a cleaning cloth according to the present invention for achieving the above object is a cleaning cloth in which a cleaning liquid for dissolving dirt attached to a blanket cylinder and an additive having a cationic hydrophilic group are impregnated into a wiping body. In addition, the cleaning cloth absorbs the dirt as the blanket cylinder is wiped, and attaches the cationic hydrophilic group to the blanket cylinder.

  Further, in the cleaning cloth having the above-described characteristics, the additive may be formed by mixing a plurality of quaternary ammonium salts. According to the cleaning cloth having such characteristics, a so-called cationic surfactant can be used as an additive.

  Further, in the cleaning cloth having the above-described characteristics, the wiping body is preferably made of a nonwoven fabric. According to this feature, a material generally used as a material for a cleaning cloth in a rotary printing press can be used, and a rise in manufacturing cost of the cleaning cloth can be suppressed.

  According to the printing paper antistatic method having the above-described features, it is not necessary to add a new configuration for antistatic to the offset printing press. For this reason, there is no possibility that the size and price of the printing machine will be increased.

1 is a diagram illustrating a part of a configuration of a sheet-fed offset printing press to which a method for preventing static electricity of a printing paper according to an embodiment is applied. It is an image figure showing signs that a cationic hydrophilic group attached to a blanket cylinder is adsorbed on printing paper. It is an image figure showing the composition of the cleaning cloth for carrying out the antistatic method of the printing paper concerning an embodiment.

  Hereinafter, embodiments of a method for preventing static electricity of a printing paper and a cleaning cloth according to the present invention will be described in detail with reference to the drawings. The embodiment described below is a part of a preferred embodiment for carrying out the present invention, and may be regarded as a part of the present invention, even if appropriately modified, as long as the effects are exerted. it can.

  As shown in at least FIG. 1, an offset printing press to which the antistatic method for printing paper according to the present invention is applied includes a plate cylinder 12 on which ink is placed on the outer peripheral surface along a print pattern, and ink is transferred from the plate cylinder 12. The apparatus includes a blanket cylinder 10 and an impression cylinder 14 for pressing a printing paper 20 against the blanket cylinder 10. In the offset printing press having such a configuration, when the printing paper 20 is sent out from the feeder 16, or on the printing path such as the passage between the blanket cylinder 10 and the impression cylinder 14, peeling and peeling, and rubbing, etc. The static electricity is charged on the printing paper 20, which adversely affects the alignment of the paper after printing.

  In the printing paper antistatic method according to the present embodiment, the electrostatic charging of the printing paper 20 is suppressed by attaching a cationic hydrophilic group 30 as an antistatic component to the blanket cylinder 10. As shown in FIG. 2, the cationic hydrophilic groups 30 attached to the blanket cylinder 10 are electrically adsorbed to the negative charges 22 on the printing paper 20 charged with static electricity.

  Electrostatic attraction between printing papers in a stacker (not shown) is caused by attracting positive charges 24 and negative charges 22 generated by charging. For this reason, when the cationic hydrophilic group 30 is adsorbed to the negative charge, the negative charge 22 on the printing paper 20 is invalidated, and the electrostatic adsorption between the stacked printing papers can be suppressed. .

  In the antistatic method for the printing paper 20 according to the present embodiment, the cationic hydrophilic group 30 is attached to the blanket cylinder 10 through the cleaning cloth 40. In recent years, for cleaning the blanket cylinder 10 and other cylinders, a method has been adopted in which an elastic body is pressed against a cylinder to be cleaned through a cleaning cloth to wipe the surface of the cylinder. For this reason, when wiping the blanket cylinder 10 with a cleaning cloth, if the cationic hydrophilic groups 30 are adhered to the surface of the blanket cylinder 10 at the same time as the wiping, the printing paper 20 can be changed without changing the conventional process or equipment. Can be added with an antistatic effect.

  FIG. 3 shows an image of the structure of the cleaning cloth 40 for implementing such a method for preventing static electricity on printing paper. In FIG. 3, the cleaning liquid is shown by hatching to improve visual recognition, and the additives are shown as cationic hydrophilic groups 30. The cleaning cloth 40 according to the embodiment is configured by impregnating a wiping body 42 with a cleaning liquid 44 and an additive 46. The wiping body 42 may be a thin material having resistance to a cleaning liquid 44 and an additive 46, which will be described in detail later, resistance to friction and tension during wiping, and having water absorbability capable of impregnating the cleaning liquid 44 and the additive 46. However, there is no particular limitation. Specific examples include filaments made of a thermoplastic resin such as polyethylene, polyester, or polypropylene, vegetable fibers such as pulp, and non-woven fabrics made of a fiber material obtained by combining them.

  The cleaning liquid 44 has a property of dissolving the ink, and is not particularly limited as long as it is a solvent having no corrosiveness to the plate cylinder 12 or the blanket cylinder 10, and includes a high boiling point fatty acid ester solvent and a petroleum solvent. Desirably. The additive 46 may be a material obtained by diluting a plurality of quaternary ammonium salts with a diluent such as water, alcohol, and a solvent, for example, a cationic surfactant. The ratio of the cleaning liquid 44 to the additive 46 is preferably about 0.5 to 15% by weight, more preferably 7 to 12% by weight, based on the weight of the impregnating solvent in which the two are mixed. %. This is for maintaining a good balance between the cleaning effect and the antistatic effect.

  According to the cleaning cloth 40 having such a configuration, as the blanket cylinder 10 is wiped, dirt such as ink is adsorbed, and the cationic hydrophilic groups 30 are attached to the blanket cylinder 10 to thereby prevent the printing paper 20 from being charged. Can be played. By obtaining the antistatic effect of the printing paper by such a method, it is not necessary to add a new configuration for antistatic to the offset printing press. For this reason, the size and price of the printing press are not increased.

  In addition, in the said embodiment, it was described that the surface of the blanket cylinder 10 was wiped with the cleaning cloth 40 by pressing the elastic body through the cleaning cloth 40. However, if the cationic hydrophilic group 30 can be attached to the blanket cylinder 10 by wiping the blanket cylinder 10 with the cleaning cloth 40, the method for preventing static electricity on the printing paper according to the present invention requires specific means. Don't ask. That is, even if the worker wipes the blanket cylinder 10 and the impression cylinder 14 with the cleaning cloth 40 manually, if the antistatic effect by the attachment of the cationic hydrophilic group 30 can be obtained, It can be considered part of the invention.

  In the above embodiment, the configuration of a sheet-fed printing press has been described as an example of an offset printing press. However, the method for preventing static electricity of printing paper according to the present invention can also be applied to a rotary press using roll-shaped printing paper.

10 blanket cylinder 12 plate cylinder 14 impression cylinder 16 feeder 20 printing paper 30 hydrophilic hydrophilic group 40 washing cloth , 42 wiping body, 44 cleaning liquid, 46 additive.

In view of the above, an object of the present invention is to solve the above problem and provide an antistatic method for printing paper without adding an antistatic configuration to an offset printing press.

In order to achieve the above object, the antistatic method for printing paper according to the present invention is directed to a cleaning method in which a wiping body is impregnated with a cleaning solution for dissolving dirt in a blanket cylinder and an additive having a cationic hydrophilic group. The present invention is characterized in that the body surface is wiped by pressing an elastic body through a cloth, and a cationic hydrophilic group is attached to the blanket body.

Hereinafter, an embodiment of a method for preventing static electricity on printed paper of the present invention will be described in detail with reference to the drawings. The embodiment described below is a part of a preferred embodiment for carrying out the present invention, and may be regarded as a part of the present invention, even if appropriately modified, as long as the effects are exerted. it can.

Claims (5)

  A method for preventing static electricity on printed paper, comprising attaching a cationic hydrophilic group to a blanket cylinder via a cleaning cloth.   2. The method according to claim 1, wherein the attachment of the cationic hydrophilic group to the blanket cylinder is performed when the blanket cylinder is washed with the cleaning cloth. 3. A cleaning cloth impregnated with a cleaning liquid that dissolves dirt attached to a blanket cylinder, and an additive having a cationic hydrophilic group, to a wiping body,
The cleaning cloth absorbs the dirt with the wiping of the blanket cylinder,
A cleaning cloth, wherein the cationic hydrophilic group is attached to the blanket cylinder.   The cleaning cloth according to claim 3, wherein the additive is constituted by mixing a plurality of quaternary ammonium salts. The cleaning cloth according to claim 3, wherein the wiping body is a nonwoven fabric.

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