JPH05309349A - Electroconductive dusting adhesive material - Google Patents

Abstract

PURPOSE:To ensure that printing accuracy is enhanced and dust collection effects are increased without spoiling properties such as the adhesion of a sheet or printing suitableness by adding a specified amount of either one or both of an electroconductive carbon fiber and carbon black, to a specific rubber compound, and thereby giving the hardness of rubber a specific value of adhesion. CONSTITUTION:This dusting adhesive material contains 5 to 40 pts.wt. of either or both of an electroconductive carbon fiber or electroconductive carbon black for 100 pts.wt. of rubber compound mainly consisting of a butyl rubber imparted with adhesion. The hardness of the surface rubber is 10 to 50 deg. in terms of adhesion. In addition, the dusting adhesive material 13 constituted in an endless belt fashion, spread between guide rolls 14, 15, is pressed tightly against the surface of a sheet 12 by descending action of the guide rolls 14, 15, if dust is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to dust, which adheres to the surface of cloth, paper, plastic film, metal foil, plywood, plastic plate, metal plate, etc. (hereinafter these are collectively referred to as sheets). The present invention relates to a dust removing adhesive material that removes static electricity generated on sheets at the same time by removing dust by adhering it.

[0002]

2. Description of the Related Art Adhesive tape is also used as a dust removing adhesive for adhering and removing dust adhering to the surface of sheets, and in a printing machine, the surface of a supply roll for supplying sheets to a printing apparatus. It is used as a dust removal adhesive roll that is laminated with adhesive rubber.

[0003]

Thus, the adhesive rubber mainly composed of butyl rubber constituting the surface of the dust removing adhesive material has a high electric insulating property as a rubber and touches sheets for removing dust. At this time, static electricity is easily generated, the sheets from which dust has been removed are charged and dust around them easily adheres, and the static electricity generated on the sheets moves to the surrounding area, causing electrostatic shock or sparks. Also, troubles such as distortion of the sheets are likely to occur.

Therefore, an antistatic agent was blended with the adhesive rubber constituting the surface of the dust removing adhesive material, but most of the commercially available antistatic agents have a hydrophilic surfactant as a main ingredient, and the surface active agent is The adhesive strength of the adhesive rubber is impaired by the agent, and the antistatic agent is transferred to the sheets for packaging foods and pharmaceuticals, making it unusable for packaging foods and pharmaceuticals.
In addition, new problems such as deterioration of quality such as adhesiveness and printability of sheets have occurred.

In consideration of these problems, it was found that the following points must be taken into consideration in order to impart antistatic property to the dust removing adhesive material. (1) The adhesiveness of the adhesive rubber is not impaired (2) The adhesive rubber is not attacked by water or organic solvent (3) It does not have a bad effect on the human body (4) The quality of the sheets for removing dust is Not be damaged

Then, it was considered to add conductive metal powder, metal whiskers, metal oxide powder, etc. to the adhesive rubber constituting the surface of the dust removing adhesive material. It becomes heavy and difficult to handle, and in particular, when it is used for dust removal of sheets made of plastic, new problems such as fine scratch marks on the surface of the sheets occur.

[0007]

The adhesive material for removing dust according to the present invention does not impair the quality of sheets from which dust should be removed,
In addition, it is to remove dust without adhering the sheets, and to 100 parts by weight of a rubber compound containing butyl rubber with tackiness as a main material, one or both of conductive carbon fiber and conductive carbon black is added. 5 in total
It is characterized by containing 40 parts by weight, having a surface rubber hardness of 10 to 50 degrees, and having adhesiveness and electrical conductivity.

The rubber hardness of the adhesive rubber constituting the surface of the dust removing adhesive material can be adjusted depending on the amount of the oil compounded in the rubber compound, and the adhesiveness is the adhesiveness of polybutene or low molecular weight butyl rubber. It can be adjusted by the imparting agent, but the rubber hardness and the tackiness are generally inversely proportional, and when the rubber hardness is 10 degrees or less, the molding process becomes difficult and the strength, durability, dimensional stability and the like are remarkably lowered. On the other hand, when the rubber hardness exceeds 50 degrees, the adhesiveness is lowered and the function of adhesively removing dust is lost.

Therefore, the surface rubber hardness of the dust removing adhesive material is set to 10 to 50 degrees, and the adhesiveness is 10 g of weight (weight) observed when measured by the following procedure without sticking for 60 seconds or more. It is left as it is, 1 to 50 g weight
It is necessary to make it fall within 60 seconds. (1) Outer diameter 60 mm with peripheral surface formed of adhesive rubber
Wipe the roll twice with a volatile organic solvent (alcohol). (2) A 0.2 mm thick aluminum plate having an area of 1 cm ² is crimped with a fingertip for 60 seconds on the lower peripheral surface of the above-mentioned roller whose shaft center is hoisted horizontally, and the hook at the center of the aluminum plate is pressed. A 10 g weight for a fine balance, which is bound with a nylon thread, is hung, and the time until the aluminum plate is peeled off from the peripheral surface of the roll and dropped is measured. (3) If the aluminum plate does not peel off with the 10 g weight within 60 seconds, the weight of the weight is set to 20 g and the test is performed again. If the weight does not peel off within 60 seconds, the weight of the weight is further reduced. Test again after increasing the weight by 10 g until the weight peels off from the peripheral surface of the roll within 60 seconds and then falls in the same manner by increasing the weight of the weight by 10 g each time and within 60 seconds. The degree of tackiness is indicated by the weight of the weight that has peeled off and dropped and the time until it peels off and falls.

The dust-removing adhesive material has various shapes according to its application, such as a sheet shape, an endless belt shape, a plate shape, and a roll shape by laminating an adhesive rubber on the surface of a base cloth, an endless belt, a plate, a roll or the like. To prepare.

To illustrate the shape of the dust removing adhesive material, FIG.
In the above, an endless belt-like dust removing adhesive material 13 is stretched between the guide rolls 14 and 15 on the side of the printing apparatus 11 that supplies the printing paper 12, and when dust is found, the guide roll 14 15 drops and paper 1
It is designed to be crimped to the surface of 2. Of course, it is possible to rotate the dust removing adhesive material 13 while always contacting the paper 12.

In FIG. 2, it is applied to remove dust on the surface of the panel 17 fed into the coating chamber.
The dust removing adhesive material 13 has a plate shape.

When the dust collecting adhesive is formed into a sheet, an adhesive or adhesive having a stronger adhesiveness than the adhesive rubber laminate is laminated on the back surface of the base fabric opposite to the adhesive rubber laminate to remove dust. It is also possible to make a dust removing adhesive plate or dust removing adhesive roll by adhering the removing adhesive material to the mother body.

It cannot be said that the larger the compounding amount of the conductive carbon fiber and the conductive carbon black applied for preventing the static electricity of the sheets, the better. If it is too large, the rubber hardness exceeds 50 degrees. It becomes difficult to control the adhesiveness, and from the experimental results, the conductivity of the dust removing adhesive 13 for preventing static electricity is
The optimum resistance value is 10 ^{3 5} Ωcm. H. C (meaning 40 parts by weight with respect to 100 parts by weight of the rubber compound, which is an abbreviation for per-handred compound) and below.

On the other hand, in order to prevent electrification, it is necessary to impart electric conductivity to the adhesive rubber so that the electric resistance value is 10 ⁹ Ω · cm or less. For that purpose, a conductive carbon fiber and a conductive carbon black are used in combination. , The total blended amount of them is 5P. H. It is necessary to set C or more, and in this case, the compounding ratio of the conductive carbon fiber and the conductive carbon black may be 1: 1 to 7.

Because the particles of the conductive carbon black blended in the rubber compound are individually separated and independently insulated and dispersed in the rubber compound, a large amount of these particles are close to each other. If it is not blended, the antistatic effect does not occur, while if a large amount of conductive carbon black is blended, the tackiness decreases. Therefore, in order to electrically connect the dispersed conductive carbon black, it is necessary to add a conductive carbon fiber, and in order to make the adhesive rubber conductive without impairing the adhesiveness, the conductive carbon is required. Conductive carbon fibers are more effective than black.

However, since the conductive carbon fiber is in the form of elongated fibers, it is difficult to disperse it uniformly in the rubber compound, and in order to make the conductivity of the adhesive rubber uniform, it is easy to disperse the conductive carbon black in particulate form. Is required.

The conductive carbon black has an average particle size of 20.
~ 50mμ acetylene type or Ketchin type,
It is preferable to use the Ketchin type, and the conductive carbon fiber having a fiber length of 10 mm or less, preferably 2 to 6 mm.

The rubber compound has a low molecular weight obtained by mixing 1 to 3 parts by weight of sulfur, zinc white, a vulcanizing agent, a vulcanization accelerator, a stabilizer, etc., with 100 parts by weight of butyl rubber as a main material according to a conventional method. Prepared by mixing 15 to 25 parts by weight of a tackifier such as butyl rubber or polybutene and a hardness adjusting agent mainly composed of oil, kneading by mixing conductive carbon fiber and conductive carbon black, and vulcanizing treatment. And make a dust removal adhesive.

[0020]

Example: 100 parts by weight of butyl rubber, 1 part by weight of stearic acid, 3 parts by weight of zinc white, 20 parts by weight of white carbon,
1 part by weight of sulfur, 2 parts by weight of vulcanizing agent, 2 parts by weight of vulcanization accelerator,
To 100 parts by weight of a rubber compound composed of 20 parts by weight of a tackifier and 20 parts by weight of a hardness adjusting agent (oil), conductive carbon black and conductive carbon fiber are shown in the columns of experiment numbers 2 to 18 in the following table. Roll diameter of the adhesive rubber sheet made by blending with the indicated blending amount is 60 m
m, an iron core diameter of 50 mm, and a roll width of 500 mm were mounted on a roll base to prepare a dust removing adhesive roll. The rubber hardness and adhesiveness of this adhesive rubber sheet, the electric resistance value, and the static electricity removal rate were measured and the results shown in Table 1 were obtained.

[0021]

[Table 1] (Note 1) Fiber length of conductive carbon fiber is 6mm,
Fineness is 0.7 denier (Note 2) A is acetylene-type carbon black with an average particle size of 40 mμ (Note 3) K is Ketchin-type carbon black with an average particle size of 30 mμ

In the present invention, the static electricity removal rate is obtained by the following procedure. (1) A polyester resin endless sheet 18 having a width of 250 mm and a thickness of 0.2 mm has a diameter of 100 mm and a width of 30.
Two 0 mm rolls made of hard vinyl chloride resin 19 and 20
(2) The same hard vinyl chloride resin rolls 21 and 22 are faced to the hard vinyl chloride resin rolls 19 and 20, respectively, and (3) the hard vinyl chloride resin roll 19 and 21 and the endless sheet 18 made of polyester resin between each of the rolls 20 and 22 made of hard vinyl chloride resin, the rotation speed is 200 r.p.m.
p. Setting to m, the hard vinyl chloride resin roll 19 is rotated by the motor 23, and (4) the contact vinyl resin roll is used to generate static electricity of 10 KV on the polyester resin endless sheet 18,
(5) The polyester resin endless sheet 18
Then, an adhesive rubber sheet having a width of 250 mm and a thickness of 2 mm is attached to the peripheral surface of an aluminum roll base having a diameter of 56 mm with an adhesive, and the conductive dust removing adhesive roll 24 is contact-rotated, and (6) the resin after 3 seconds. Made endless seat 1
8 electrostatic voltage (W) is measured by the electrostatic voltmeter 25,
The measured value W (KV) is divided by 10 KV and multiplied by 100 to obtain the static electricity removal rate.

The above experiment numbers 1, 3, 4, 11, 12,
The dust removing adhesive rolls 24 using the adhesive rubber sheets 15 and 17 were mounted on a business form rotary printing machine as guide rolls on the paper feeding side, respectively, and dust was collected depending on the accumulated state of dust adhering to the surface of the dust removing adhesive roll 24. The removal effect was examined, the electrostatic charge on the printing paper before and after passing through the dust removing adhesive roll was measured, and the static electricity removal rate was calculated to obtain the results shown in Table 2.

[0024]

[Table 2]

[0025]

EFFECT OF THE INVENTION Since the dust removing adhesive according to the present invention is made conductive by the conductive carbon fiber and the conductive carbon black, not by the surfactant or the metal powder, it does not become heavy and difficult to handle. The bleeding of the surfactant does not impair the adhesiveness and printability of the sheets, and there is no scratch mark on the surface of the sheets. Since it is removed, the printing accuracy is improved, the dust removal effect is enhanced, and the dustproof effect after that also occurs, there is no electrostatic shock or spark generation during use, and since butyl rubber is the main material, moisture and As a dust-removing adhesive roll for printing synthetic paper and plastic films, which are not easily attacked by organic solvents and are easily rotated at high speed to generate static electricity. That is convenient.

[Brief description of drawings]

FIG. 1 is a side view of a printing apparatus using a dust removing adhesive material according to the present invention.

FIG. 2 is a side view of a panel coating apparatus using the dust removing adhesive material according to the present invention.

FIG. 3 is a side view of an apparatus for measuring a static electricity removal rate of a dust removing adhesive sheet.

[Explanation of symbols]

 11 Printing Device 12 Printing Paper 13 Dust Removal Adhesive Material 14 Guide Roll 15 Guide Roll 16 Painting Chamber 17 Panel 18 Endless Sheet 19 Hard Vinyl Chloride Resin Roll 20 Hard Vinyl Chloride Resin Roll 21 Hard Vinyl Chloride Resin Roll 22 Hard Vinyl Chloride Resin roll 23 Motor 24 Dust removal adhesive roll 25 Electrostatic voltmeter

Claims (5)

[Claims] 1. A total of 5 to 40 parts by weight of one or both of a conductive carbon fiber and a conductive carbon black is added to 100 parts by weight of a rubber compound containing butyl rubber to which tackiness is imparted as a main material, and a surface rubber hardness. Is 10-5
A conductive dust-removing adhesive material with 0 degree tackiness. 2. A total of 5 to 20 parts by weight of a conductive carbon fiber and a conductive carbon black are added to 100 parts by weight of a rubber compound containing butyl rubber having tackiness as a main material, and a surface rubber hardness of 10 to 50. Conductive dust removal adhesive with high degree of adhesion. 3. A total of 5 to 20 parts by weight of a conductive carbon fiber and a conductive carbon black are added to 100 parts by weight of a rubber compound containing butyl rubber having tackiness as a main material, and a surface rubber hardness of 10 to 50. A conductive dust-removing adhesive material having adhesiveness, which is formed into a sheet shape. 4. A total of 5 to 20 parts by weight of a conductive carbon fiber and a conductive carbon black are added to 100 parts by weight of a rubber compound containing butyl rubber to which tackiness is added as a main material, and a surface rubber hardness is 10 to 50. A conductive dust-removing adhesive material having adhesiveness, formed in a plate shape. 5. A total of 5 to 20 parts by weight of a conductive carbon fiber and a conductive carbon black is added to 100 parts by weight of a rubber compound containing butyl rubber to which tackiness is imparted as a main material, and a surface rubber hardness of 10 to 50. A conductive dust-removing adhesive material having adhesiveness, which is formed in a roll shape.