JPH06207614A - Carbon fiber reinforced resin-made roll - Google Patents

Abstract

PURPOSE:To enable a carbon fiber reinforced resin-made roll which can be rotated at a high speed, can have good following performance having high-speed rotation and a good separating performance of ink, and on which any surface flaw is not easily generated, together with excellency in its durability, to be suitably used for the printing field where high-speed process like a rotary press for printing newspapers is required. CONSTITUTION:The carbon fiber reinforced resin-made roll formed by being integrated with a resin film on its obverse, is excellent in ink separating performance, wherein fluorine/silicon including polymer obtained by copolymerizing copolymerizable and including fluorine group monomer and silicon macro- monomer capable of being baked and hardened at a temperature less than that of the secondary transition point (Tg) of resin for constituting the carbon fiber reinforced resin and other vinyl group monomer capable of being copolymerized are integrally formed into a film on the obverse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a light weight and a high rigidity, and is used for conveying a workpiece and a roll surface such as a conveying roll or a guide roll in a printing machine, a papermaking machine, a paper processing machine or the like. The present invention relates to a roll that requires peelability or non-adhesiveness, and particularly relates to a roll that exhibits excellent ink peelability in a printing machine.

[0002]

2. Description of the Related Art Conventionally, the rolls used in a printing machine, a papermaking machine, a paper processing machine, etc. are mainly made of steel or aluminum. Chrome plating was mainly used as the surface treatment, but recently, a part of the surface of the metal which is coated with a fluororesin by baking is also used.

On the other hand, due to recent industrial progress, various attempts have been made to increase the speed of the machine as described above, and in order to satisfy the demand for such high speed, carbon fiber reinforced resin (hereinafter referred to as CFRP). Rolls using as a base material are being used (Japanese Patent Laid-Open No. 2-159409). In the case of rolls using CFRP as a base material, the surface treatment may be chrome plating, rubber coating, ceramic coating, baking of fluororesin, Teflon shrink tube coated product, or the like.

[0004]

However, in the case of a roll whose base material is made of metal, the roll is heavy, so that the moment of inertia (GD ² ) is large and it takes time to accelerate and decelerate the line speed. Rotation is heavy and high tension is applied to the object to be processed, for example, it is difficult to make a thin product, and in the case of a printing machine, there is a problem that a color matching problem occurs during printing. Further, in the case of such a metal roll, there is also a problem that the specific elastic modulus is low and the roll is largely deflected by its own weight as compared with a CFRP roll.

There are various kinds of roll surface treatments as described above. For example, in the case of a printing machine, most of them are chrome-plated, and the ink is not adhered easily, the problem of paper stains, the trouble of cleaning, and Had a problem of deteriorating the working environment of cleaning using an organic solvent or the like.

Other surface treatments are also used in the general industry and are known, but rubber-coated rolls, ceramic-coated rolls, etc. are not suitable for the above-mentioned applications. There is a problem in that the cost is considerably high in the case where the roll surface is baked with the fluororesin, the roll is deformed even when it is processed into an aluminum roll, and it is difficult to make a roll with high accuracy. The Teflon shrink tube coated product has no problem in roll accuracy, but has problems such as high tube cost.

The present invention solves the above-mentioned conventional problems, enables high-speed rotation, has good followability at high-speed rotation, has good ink releasability, and is resistant to surface scratches and durability. The present invention provides an inexpensive carbon fiber reinforced resin roll which is excellent in use and is suitable for use in a printing field requiring high-speed processing such as a rotary press for newspaper printing.

[0008]

Therefore, according to the present invention, in a carbon fiber reinforced resin roll having a surface integrally formed with a resin film, a resin constituting the carbon fiber reinforced resin is used.
A polymer obtained by copolymerizing a copolymerizable fluorine-containing monomer that can be baked and cured at a temperature lower than the next transition point (Tg), a silicon macromonomer, and another copolymerizable vinyl monomer on the surface A carbon fiber reinforced resin roll having good ink releasability, which is characterized in that a film is integrally formed, and is used as a means for solving the above problems.

In a preferred embodiment of the present invention, when a resin film having good releasability is integrally formed, CF film is used.
Using a fluorine-silicon-containing polymer that can be baked and cured at a temperature below the Tg of the resin that constitutes RP,
Interfacial tension is less than 30 dyne / cm, contact angle with water is 8
A CFRP roll having a dynamic friction coefficient of not less than 0 °, not more than 0.2, and a surface electric resistance of not more than 10 ⁸ Ω.

CFRP is a polymer containing fluorine and silicon which can be cured at a low temperature and gives a resin film having good peelability.
After spray coating on the roll tube, by baking and curing at a temperature lower than the Tg of the resin that constitutes CFRP, it is possible to obtain a resin film that is tough, durable, and has good ink releasability. It is suitable for producing high-precision rolls with high productivity.

Examples of the fluorine-containing monomer used in the present invention include a perfluoroalkyl group- or fluoroalkyl group-containing (meth) acrylic acid ester-based monomer, and examples of the silicon-based macromonomer include Toa AK-5 and AK-40 manufactured by Synthetic Chemical Industry Co., Ltd. may be mentioned. Other copolymerizable vinyl monomers include methyl (meth) acrylate and ethyl (meth) acrylate.
Propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, styrene, α-methylstyrene, p-tert-butylstyrene, dimethylstyrene, vinyltoluene. , (Meth) acrylamide, N-methylol (meth) acrylamide, butoxy (meth) acrylamide, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate,
3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 3-chloro-2-
Hydroxypropyl (meth) acrylate, di-2-hydroxyethyl fumarate, mono-2-hydroxyethyl-monobutyl fumarate, polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, "Plaxel FM to FA
Monomer "[caprolactone addition monomer manufactured by Daicel Chemical Industries, Ltd.], dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, and further (meth) acrylonitrile, vinyl acetate, diethyl maleate, dibutyl maleate, fumar Examples thereof include dibutyl acid, diethyl icotanate, and dibutyl icotanate.

A fluorine / silicon-containing polymer can be obtained from these by a conventional solution polymerization method using a radical polymerizable initiator. The fluorine / silicon-containing polymer lowers the critical surface tension, serves to improve the peelability of the newspaper ink, and further lowers the sliding resistance with the newspaper to improve the durability. The sliding resistance is expressed as a dynamic friction resistance, and when it is 0.2 or less, it is effective in improving durability.

In newspaper printing, it is desired to impart conductivity to the surface of the roll in order to prevent printing failure due to static electricity and adhesion of paper powder. As the carbon black is added to the resin system of the present invention in the range of 1 to 10 wt%,
The problem can be solved by setting the surface electric resistance to 10 ⁸ Ω or less.

Next, a method of manufacturing the carbon fiber reinforced resin roll according to the present invention will be described. A high-strength, high-elasticity reinforcing fiber represented by carbon fiber tow is used, and the fiber is impregnated with a thermosetting resin and heat-cured to form a raw tube. Although the type of carbon fiber is not particularly limited, it is preferable to use a highly elastic yarn having a higher elastic modulus in order to reduce the weight and increase the rigidity. If necessary, glass fiber or aramid fiber may be used in combination.

As the molding method, there are various methods such as a sheet wrapping method, a filament winding method, a pultrusion molding method, and a resin transfer molding method, which are not particularly limited. Therefore, as a matter of course, the resin impregnation method is also performed by a method generally performed by these molding methods. The type of resin is also not particularly limited, but an epoxy resin, a vinyl ester resin, or a mixture thereof is the most common.

The sheet formed by the sheet wrapping method and the filament winding method is formed by lapping or filament winding on a metal mandrel and then heat curing to form a raw tube. The product formed by the drawing method is drawn by a pipe-shaped die to form a raw pipe. What is molded by the resin transfer molding method is molded by a metal mold or a resin mold.

The blank formed in this manner is generally lengthened to determine the length of the roll, and then the header or journal is attached. The header or the journal is joined by adhesive joining, mechanical joining, or a combination of adhesive joining and mechanical joining. After that, CF
Polish the outer periphery of RP and finish the bearing fitting part and bearing part. The CFRP outer periphery may be polished before the header or the journal is joined, and then the header or the journal may be joined to finish the bearing fitting portion and the bearing portion.

After that, balancing is carried out, and finally, the fluorine-silicon containing polymer as described above is coated to obtain a product. Balancing is performed by static balance or dynamic balance depending on the length and rotation speed of the roll, but it is necessary to maintain dynamic balance for those that rotate at high speed, such as rotary press rolls. If the roll length is short or the rotation speed is slow, static balancing is sufficient.

Next, the coating method of the fluorine / silicon containing polymer resin of the present invention will be explained. First, the main component of the resin and the thinner are diluted and mixed, and then the curing agent is mixed. Since the viscosity condition has a great influence on the surface paintability, the viscosity is measured with a Ford cup or an Iwata cup. In this case, about 8 to 25 seconds is preferable as a standard. The resin thus prepared is coated on the polished CFRP surface with a spray coater. At this time, if it is difficult to atomize and it is in the form of a string, an appropriate amount of diluted thinner is added to adjust the viscosity.

When it is desired to apply a thicker coating, the coating is allowed to stand for several minutes and then the second coating is carried out. When thicker coating is required, the same operation is repeated several times. Regarding the viscosity of the Ford cup or the Iwata cup, it has been found from experiments by the present inventors that those having a viscosity of about 8 to 15 seconds provide a better coated surface. However, the viscosity adjustment is naturally different depending on workability, purpose, etc. and is not particularly limited.

Regarding the heat curing method, 10 to 1 after coating
It is possible to start heating after 5 minutes, but if the condition of the unevenness of the base is poor or the coating thickness is thick, it may take some time and heating should be done after the diluted thinner has sufficiently volatilized. preferable. Regarding the heating temperature, if you want to process in a short time, it is relatively high temperature, but if you have enough time, even if you cure it at room temperature over time, the film performance and surface peeling performance Is not inferior.

[0022]

The present invention will be described in detail with reference to the following examples.

(Example 1) 93 mm inner diameter, 100 m outer diameter
m, length 2000 mm, base material carbon fiber (Mitsubishi Rayon Pyrofil TR40 fiber longitudinal elastic modulus 24000 k
g / mm ² ) was used to produce a roll for a printing machine, the outer surface of which was coated with the above-mentioned fluorine-containing silicon-containing polymer. First, a filament winding machine was used to manufacture a shell, and a carbon fiber tow impregnated with a resin was wound around an iron mandrel having an outer diameter of 93 mm, and heat cured to form the shell. At this time, the matrix resin of the raw tube was an epoxy resin, and the secondary dislocation point was 165 ° C.

The wrapping angle of the fibers is such that the orientation of the fibers of the outermost layer is 90 ° with respect to the axis of the roll so that the smoothness of the coating is good. It has a fiber orientation of 90 when molded on a filament winding machine.
This is because if it is other than °, the smoothness of the surface is impaired due to the entanglement of the fibers. The length of the raw tube molded in this way is determined to 2000 mm, the iron header is adhered, then the CFRP outer periphery is polished with a cylindrical grinder, and then the bearing fitting part of the header is finished to an inner diameter of 62 mm. It was

After that, the surface of the CFRP was further finished with sandpaper # 240 to make the surface uneven, and then 2,2,2.
2-trifluoroethyl methacrylate 300 parts, A
Solution polymerization of a monomer mixture consisting of 0.6 parts of K-5 (Toagosei Kagaku Kogyo Co., Ltd .: silicon macromonomer), 157.2 parts of styrene, 139.2 parts of 2-hydroxyethyl methacrylate, and 3 parts of methacrylic acid in toluene. 4 parts of carbon black are dispersed in 100 parts of the polymer containing fluorine and silicon, and polyisocyanate (Sumijour N75: Sumitomo Bayer Urethane) is added to this.
NCO / OH = 1/1 (equivalent ratio), diluted with Ford Cup No4 for 15 seconds, coated with a spray coater to a thickness of 40 µ, left for 1 hour, and then cured at 80 ° C for 60 minutes. . The coated surface obtained was very smooth and the coating performance was good. Table 1 is a calculation of longitudinal elastic modulus, weight, GD ^{2 and the} like for the above rolls, and it can be seen from the table how excellent the mechanical performance of the rolls of the present invention is.

[0026]

[Table 1]

Further, in order to investigate the surface characteristics of the roll manufactured in this way, the contact angle with water was measured.
It was found to have a very high value of 102 degrees and a good performance in terms of peeling property. The surface tension of the roll is 23
Dyne / cm, surface electric resistance was 2 × 10 ⁴ Ω, and dynamic friction resistance with newspaper was 0.11. To further check the stain resistance, apply carbon black dissolved in water on the surface, and
After baking for 1 hour at 0 ° C., no stain was left on the roll surface due to carbon black.

A pencil hardness test was conducted to examine the film strength of the surface, and it was found that the hardness was 2H or more, and the paper or film transporting roll had sufficient surface characteristics. At the same time, a cross-cut test was conducted on the surface of the roll to examine the adhesion strength of the film, and the film and the CFRP base material were extremely firmly adhered to each other and were sufficiently reliable.

Further, in order to investigate whether or not the heat treatment at the time of baking the roll coating accurately changed, the vibration accuracy of the roll was measured as follows. First, put both ends of the roll on the V block, apply a dial gauge to the center part, rotate this roll, and measure the shake deviation. The shake deviation of the roll is exactly the same as that before coating this film 0 It was 0.02 mm, and it was proved that the base material was thermally stable because the film was formed at a low temperature (80 ° C.).

When this roll was used as a roll for a newspaper rotary press, it was lightweight and did not adhere to ink, and the printing speed, color spots and workability were remarkably improved. Also, the surface electric resistance is 10 ⁵ Ω even in a dry atmosphere.
It was the following, and there was no adhesion of paper powder, and it had abrasion resistance and was a very good roll.

[0031]

The carbon fiber reinforced resin roll of the present invention constructed as described above has the following excellent effects.

(1) Since the weight can be reduced as compared with the conventional metal roll, the rotation performance is increased, the process speed is increased, and the tension of the object to be processed can be reduced. (2) Since the process start-up time and down time are short, the product yield can be improved. (3) Since the ability to follow the speed is good, it is possible to control the tension delicately. (4) Due to the formation of the surface film, the ink does not adhere to the rolls, which is suitable for fields requiring high-speed processing such as a rotary press for newspaper printing. (5) Since the surface has good peelability, it is convenient when treating a tacky product. (6) Since the coefficient of friction with newspaper when printing is reasonably low,
No surface scratches, durability is greatly improved, and paper dust is not attached. (7) Since the molding of the surface resin film can be carried out at a low temperature, it is possible to manufacture a highly accurate roll without impairing the accuracy of the roll. (8) The cost is low and the economy is excellent as compared with the conventional coating of Teflon tube.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D21G 1/02 7199-3B // B29K 105: 08 B29L 31:32 4F (72) Inventor Masamitsu Ito 4-60 Sunadabashi, Higashi-ku, Nagoya-shi, Aichi Mitsubishi Rayon Co., Ltd. Product Development Laboratory

Claims (3)

[Claims] 1. A roll made of a carbon fiber reinforced resin having a surface integrally formed with a resin film, wherein bake hardening is performed at a temperature lower than the secondary dislocation point (Tg) of the resin constituting the carbon fiber reinforced resin. It is possible to form a film integrally on the surface of a fluorine-silicon-containing polymer obtained by copolymerizing possible copolymerizable fluorine-containing monomers, silicon macromonomers and other copolymerizable vinyl monomers. A characteristic carbon fiber reinforced resin roll with good ink releasability. 2. The surface tension of the roll is 30 dyne / cm.
The carbon fiber reinforced resin roll according to claim 1, which has surface characteristics such that a contact angle with water is 80 ° or more and a coefficient of dynamic friction with newspaper is 0.2 or less. 3. The carbon fiber reinforced resin roll according to claim 1, wherein the fluorine / silicon-containing polymer contains 1 to 10% by weight of carbon black and has a surface electric resistance of 10 ⁸ Ω or less.