JPH05201597A - Fiber reinforced plastic roller - Google Patents

Abstract

PURPOSE:To obtain a roller that is light, free from contamination, and excellent in releasing by forming a highly nonadhesive film on the surface of a fiber reinforced plastic cylinder. CONSTITUTION:The outer surface of a fiber reinforced plastic roller 1 is coated with ultra-high polymer polyethylene 2 with an molecular weight of one million or more. A coating can be obtained by covering the surface of a cylinder with heat-shrinkage tube of ultra-high polymer polyethylene, or by forming it directly on the surface of the cylinder. Also the outer surface of the fiber reinforced plastic roller 1 is coated with fluorine-acrylic system resin. Concretely, after curing agent such as isocyanate, etc., has been added to the resin, it is applied on the cylinder by spraying or with brush, etc., and cured at room temperature or heat-cured, or the fluorine-acrylic system resin only is applied on the cylinder and cured by radiating ultraviolet ray.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber reinforced plastic roller, which is used as a roller which is required to be resistant to ink or paper dust, such as a guide roller of a printing machine. Is.

[0002]

2. Description of the Related Art Conventionally, in a field requiring prevention of ink adhesion, high abrasion resistance, high corrosion resistance, etc., such as a guide roller of a newspaper rotary printing press, chrome plating is applied to the surface of a metal cylindrical object. A roller provided with is used. Although such a chrome-plated roller has excellent wear resistance and corrosion resistance, it is not sufficient in terms of ink adhesion prevention performance, and the ink sticks due to long-term operation and They cannot be easily removed during cleaning, and sometimes it is necessary to stop the press and wipe them off. In addition, since the guide roller rotates due to the running of the paper that is in contact with it, if the roller itself is heavy like metal, the moment of inertia is large, so the roller will change when the speed changes during operation. Causes a phenomenon that can not follow. Further, in recent years, as the demand for machines has been increased, the influence of the moment of inertia becomes more serious. Therefore, we examined the use of carbon fiber reinforced plastic rollers to reduce the weight of the rollers themselves.However, if the carbon fiber reinforced plastic rollers were used as they were, stains such as ink would easily adhere or stick to the roller surface. However, the actual application is difficult at present.

[0003]

If a cylinder made of fiber reinforced plastic is used in order to cope with the weight saving of the roller due to the speeding up of the machine as described above, the surface of the cylinder has high corrosion resistance as in the case of a metal cylinder. It is no longer necessary to consider coating with a film to prevent corrosion of the underlying metal. Further, a roller, such as a guide roller, which rotates at the same speed as the product as it travels, is less likely to wear during constant speed operation, so it is not necessary to consider wear resistance. Of course, when the speed changes, the moment of inertia causes wear between the product and the roller, but this is also significantly reduced by changing from a metal cylinder to a fiber reinforced plastic cylinder, and the moment of inertia becomes small, Wear is not a problem with the use of. Therefore, non-adhesiveness or releasability is the most important issue to be improved. For that purpose, by coating the outer peripheral surface of the fiber-reinforced plastic cylinder with a material that is more non-adhesive than chrome plating, it is difficult for dirt such as ink to adhere, or even if it adheres, it can be easily washed and removed. Yes, and
It is desired to improve the releasability of the product passing over the roller.

The present invention has been made on the basis of the above-mentioned findings, and an object of the present invention is to form a highly non-adhesive film on the surface of a cylindrical article made of fiber reinforced plastic. Lightweight and resistant to dirt, and
It is to provide a roller having a good releasability.

[0005]

In order to solve the above-mentioned problems, according to the invention described in claim 1, as shown in FIG.
The outer peripheral surface of the fiber-reinforced plastic roller 1 is coated with ultrahigh molecular weight polyethylene 2. The ultrahigh molecular weight polyethylene referred to here has a molecular weight of 1
It means that it is more than 1,000,000. The ultra high molecular weight polyethylene film on the fiber reinforced plastic cylinder covers the surface of the cylinder with a heat shrink tube made of ultra high molecular weight polyethylene, or
Alternatively, it can be obtained by directly molding on a cylinder. Ultra high molecular weight polyethylene coating thickness is 0.005-10m
It is preferably in the range of m. Thickness is 0.005mm
If it is smaller than 10 mm, the base material is exposed due to abrasion, and if it exceeds 10 mm, the material cost increases, which is uneconomical.

In order to solve the same problem, the invention according to claim 2 is characterized in that, as shown in FIG. 2, the outer peripheral surface of the fiber-reinforced plastic roller 1 is coated with a fluorine-acrylic resin 3. It is what Specifically, after adding a curing agent such as isocyanate, it is applied on the cylinder by spraying or brushing, and then it is cured at room temperature or by heating, or only the fluorine-acrylic resin is applied on the cylinder by spraying or brushing. After that, it is irradiated with ultraviolet rays to be cured. The thickness of the fluorine-acrylic resin is
The range of 0.005 to 0.5 mm is preferable.
If the thickness is less than 0.005 mm, it cannot withstand long-term use and the base is exposed due to abrasion. Also,
Coating of 0.5 mm or more is possible, but
If it exceeds 5 mm, the accuracy as a roller cannot be maintained as it is as coated, and processing after coating is required, which is uneconomical.

[0007]

In order to examine the non-adhesiveness of the ultra-high molecular weight polyethylene and the fluorine-acrylic resin coated on the surface of the roller of the present invention to ink, a 10 cm × 10 cm carbon fiber reinforced plastic plate (thickness 2 mm) is used. On the surface of the test piece, 0.5 film of ultra high molecular weight polyethylene
mm formed, fluorine-acrylic resin 0.0
6 mm formed, and for comparison, a carbon fiber reinforced plastic plate itself and a steel plate (plate thickness 2 mm) formed with a chromium plating film of 0.03 mm were prepared. The surface roughness of all the test pieces was unified to 0.5S. Ink (Dainippon Ink and Chemicals, Inc., Newsjet GC black ink) was applied to the surface of these test pieces, and after the ink was dried, an adhesive tape (610 made by 3M) was attached and peeled off. The residual rate of the ink on the test piece and the peel strength when the ink was peeled off were measured, and the results are shown in Table 1. A universal tester (AG-10TB manufactured by Shimadzu Corporation) was used to measure the peel strength.

Next, in order to evaluate the releasability of the adhesive tape, a test piece similar to the above was prepared, and the adhesive tape (610 manufactured by 3M) was peeled off from the film formed on the test piece or the test piece itself. The strength was measured by a universal testing machine, and the results are also shown in Table 1.

Further, as another method for evaluating the degree of non-adhesiveness, the contact angle of water was determined. A test piece consisting of a 2.5 cm x 4 cm carbon fiber reinforced plastic plate (thickness: 2 mm) with a 0.5 mm ultra-high molecular weight polyethylene film formed thereon, and a 0.06 mm fluorine-acrylic resin coating For comparison, a carbon fiber reinforced plastic plate itself and a steel plate (plate thickness 2 mm) having a chrome plating film formed on it by 0.03 mm were prepared. The surface roughness of all the test pieces was unified to 0.5S. The contact angle of water on these test pieces was measured by a contact angle meter, and the results are also shown in Table 1.

[0010]

[Table 1]

In Table 1, the ink residual ratio means the ratio of the ink remaining on the test piece after the ink was peeled off with the adhesive tape. Further, the peel strength in Table 1 is a measured value when the ink is partially peeled from the surface of the test piece by the adhesive tape, and it is easy to measure the adhesion between the ink and the surface of the test piece. Furthermore, the larger the contact angle in Table 1 is, the higher the water repellency is, that is, the higher the non-adhesiveness is.

As is clear from the measurement results shown in Table 1,
Ultrahigh molecular weight polyethylene and fluorine-acrylic resin, which are the surface coating of the roller of the present invention, showed better non-adhesiveness than chrome-plated steel plate and carbon fiber reinforced plastic plate in all experiments.

[0013]

[Examples] Next, four types of rollers shown below were prepared in order to perform an ink adhesion test using an actual machine. In addition,
In order to make the conditions of all rollers the same, the surface roughness was unified to 0.5S.

A roller was prepared by coating a carbon fiber reinforced plastic cylinder having a length of 1.946 mm, an outer diameter of 100 mm and a thickness of 4 mm with a heat-shrinkable tube made of ultra-high molecular weight polyethylene having a thickness of 0.5 mm. A roller was prepared by coating a carbon fiber reinforced plastic cylinder having a length of 1.946 mm, an outer diameter of 100 mm and a thickness of 4 mm with a fluorine-acrylic resin by spray coating to a thickness of about 0.06 mm. Roller Length: 1.946 mm, outer diameter: 100 mm, thickness: 4 mm An iron cylinder having a chromium plating of 0.03 mm was prepared. Roller A carbon fiber reinforced plastic roller having a length of 1.946 mm, an outer diameter of 100 mm and a thickness of 4 mm was prepared.

Ink Adhesion Test The rollers thus prepared were actually mounted as guide rollers for a newspaper rotary printing press, and after running for 3 hours, the degree of ink adhesion on the rollers was confirmed and compared. . As a result, almost no ink adhered to the roller coated with ultra-high molecular weight polyethylene and the roller coated with fluorine-acrylic resin, and the slightly adhered ink was easily removed by the solvent. But,
Ink adhered to almost the entire surface of the chrome-plated iron cylinder and the carbon fiber reinforced plastic roller, and could only be removed by wiping with a solvent-moistened waste cloth.

The fiber reinforced plastic roller is not limited to the carbon fiber reinforced plastic roller exemplified in the embodiment, and a glass fiber reinforced or aramid fiber reinforced plastic roller may be used.

[0017]

As described above, when the roller of the present invention is used, the adhesion of stains such as ink is extremely reduced, and the work required for removing stains is greatly saved. In addition, the number of times the machine is stopped for the dirt removal work can be reduced, so that the productivity is improved. Further, since the roller material and the surface coating material thereof are both made of a non-metallic material, the corrosion found in conventional metal rollers is not recognized, and at the same time weight reduction is achieved. Further, when used as a guide roller, the followability is improved due to the reduction of the moment of inertia due to the weight reduction, so that friction is reduced, wear is reduced accordingly, and service life is extended. Therefore, the economic effect of using the roller of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a sectional view of a roller according to claim 1.

FIG. 2 is a cross-sectional view of the roller according to claim 2.

[Explanation of symbols]

 1 Fiber reinforced plastic roller 2 Ultra high molecular weight polyethylene 3 Fluorine-acrylic resin

Claims (2)

[Claims] 1. A roller made of fiber reinforced plastic, the outer peripheral surface of which is coated with ultra-high molecular weight polyethylene. 2. A fiber-reinforced plastic roller having an outer peripheral surface coated with a fluorine-acrylic resin.