JPH0673678A - Production of fiber tube for roll coating - Google Patents

Abstract

PURPOSE:To simply obtain a fiber tube by impregnating a fiber binder under vacuum into a hollow tubular body formed from a fiber suspension. CONSTITUTION:A fiber composition containing a fiber, an organic solvent and/or water is packed in a space between an outer cylinder 1 and an inner cylinder 2 and the organic solvent and/or water is removed by suction to form a dried hollow tubular material 10. A fiber binder is impregnated into the dried hollow tubular material under vacuum and, as necessary, the hollow tubular material is heated.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to a method of making fiber tubes, and in particular as an alternative to tuber felt.
The present invention relates to a method for producing a roll-covering fiber tube which can be mounted on the outer periphery of a roll core material and used.

[0002]

2. Description of the Related Art Conventionally, in an aluminum forming factory or the like, for example, when an aluminum extruded die material is conveyed, rubber is used as the outer peripheral material of the roll core material on the surface of the conveyance roll (roller). Coating, non-woven coating,
It is used to coat the felt.

For example, in extrusion processing of aluminum (hereinafter referred to as aluminum), an extrusion die material that has been extruded from a die of an extrusion tool is conveyed to a post-processing facility in a heated state to be a desired aluminum processed product. For this reason, in an aluminum processing plant, a conveyer such as a drive conveyor, a walking beam cooling stand, and a line out table, and a lifting machine are installed, and the extrusion die material immediately after coming out of the die is
It is supported by a plurality of transfer rollers, and then sent to a predetermined transfer machine or processing equipment. Immediately after coming out of the die, the extrusion mold material has a high temperature close to the melting point (660 ° C.) of aluminum, so that the surface will be damaged if it comes into direct contact with the roller surface. For this reason, the surface of the roller is coated with rubber, non-woven fabric or felt as described above. Many of the rubber-coated rolls are made of hard rubber, which may damage the surface of conveyed products such as aluminum plates.In recent years, non-woven fabric-coated rolls and tube-shaped felts have been used. Attention has been paid.

The method for producing a non-woven fabric-coated roll is generally as follows: a method in which a narrow non-woven fabric is spirally wound around the outer periphery of a roll core material, or a non-woven fabric is rolled.
For example, a method of fitting a large number of discs punched in a nut shape to a roll core material and compression-molding it.

However, in the roll method of winding the narrow width nonwoven fabric around the roll core material, it takes a lot of work. In the winding method, one end of the narrow width nonwoven fabric is fixed to the roll core material, and then the nonwoven cloth is formed. The rolls are successively wound in the width direction of the roll while applying tension, but at this time, a gap may occur between the non-woven fabrics, resulting in lack of uniformity of the roll surface. There is. Furthermore, when a thick non-woven fabric is wound around a roll with a small diameter, the surface of the non-woven fabric is greatly bent, the porosity of the surface is large, and the roll core side is compressed and the density is large. This causes a problem that the layer and the inner layer have different properties.

Further, in the method of compression-molding a large number of doughnut-shaped nonwoven fabrics on a roll core material, it takes too much time and labor such as preparing a large number of discs punched in a donut-shaped nonwoven fabric, Further, a needle punching process (needling) is required for forming the nonwoven fabric, and this needling requires a great deal of time.

On the other hand, a tube-like felt formed by using a woven fabric and / or yarn made of heat-shrinkable fibers as a base layer, and attaching a fiber web to one or both sides of the base layer, and integrating them into a cylindrical shape by a needle ring. Is proposed. This tube-shaped felt can be rolled by covering it with various rolls and then heating it.
It can be used conveniently because it can be closely attached to the core material, but due to its shrinkability, it is generally difficult to make one with a constant diameter, it takes time to needle, and a base cloth is also required. The cost will be high.

Examples of utility models and patents which describe the tuber-like felt and the non-woven fabric-coated roll are, for example, Japanese Utility Model Publication No. 2-4145, Japanese Patent Laid-Open No. 2-251657, Japanese Patent Publication No. JP-A No. 54-33940, JP-A No. 60-94661, and Japanese Utility Model Laid-Open No. 2-54917 are mentioned.

[0009]

The object of the present invention is to eliminate the drawbacks of the prior art.

[0010]

According to the present invention, a hollow cylindrical body is formed from a fiber composition containing fibers and an organic solvent and / or water, and the hollow cylindrical body is vacuumed with a fiber binder. A roller characterized in that it is impregnated under to obtain a fiber tube.
The present invention relates to a method for producing a fiber tube for coating a fiber.

Next, a preferred embodiment of the manufacturing method of the present invention will be described with reference to the drawings as appropriate. As shown in FIG. 2, the space (gap) between the outer cylinder 1 and the inner cylinder 2 is filled with a fiber composition 3 containing fibers and an organic solvent. As the fibers, synthetic fibers such as aramid fibers and polyester fibers, inorganic fibers such as ceramic fibers, carbon fibers, glass fibers and metal fibers, and natural fibers such as wool and cotton can be used. These fibers can be appropriately mixed and used. It is preferable that the fiber is a heat resistant fiber for the purpose of the present invention. The fibers are preferably short fibers in view of the fact that they can be made bulky and considering the production method of the present invention. As the fiber, it is possible to use, for example, a pulp-like material (lump) of aramid fiber or a chip-like material, which may be unraveled to form a short fiber. It is preferable that the whole of the short fibers is uniform because it is easy to fill the space between the outer cylinder 1 and the inner cylinder 2. If the short fiber is too short, the density when it is made into a hollow cylinder is difficult to increase, while
If it is too long, it may be difficult to put it in the space between the outer cylinder 1 and the inner cylinder 2, so 5 mm or less, particularly 0.3 to 3.5 mm is preferable. As the organic solvent, for example, alcohol is used. The solvent is preferably one that can be easily evaporated and can appropriately solubilize the resin according to the production method of the present invention, and alcohol is mentioned as a preferable example. However, depending on the type of fiber and the type of fiber binder described later, it is also possible to use toluene, xylene, acetone, or other organic solvent in relation to the wetting property and compatibility with them.
Water may be used instead of or together with the organic solvent. An additive such as a curing agent may be added to the fiber composition as appropriate.

As shown in FIG. 2, an outer cylinder 1 having an opening at its lower end has a wire net, a synthetic fiber net or a filter at its upper end.
It is placed on top of a mesh body having 4 or other filter body 5. In FIG. 2, 6 is a tank, 7 is a vacuum pump, and the tank 6 is decompressed by the vacuum pump. When the vacuum pump 7 is operated, the organic solvent and / or water is absorbed from the fiber composition 3, supplied to the mesh body or other filter body 5, and guided to the tank 6 via the pipe 8. Fiber and organic solvent and /
Alternatively, the fiber composition 3 containing water gradually forms a hollow cylindrical body (cylindrical body) in the space between the outer cylinder 1 and the inner cylinder 2. At that time, the fiber composition 3 can be appropriately replenished from above in the space between the outer cylinder 1 and the inner cylinder 2. The fiber composition 3 is compressed in the space between the outer cylinder 1 and the inner cylinder 2 to promote the formation of a hollow cylindrical body (cylindrical body). For the compression, for example, a disc 9 as shown in FIG. 2 may be mounted. In FIG. 2, the disk 9 is mounted only on the upper surface side of the outer cylinder 1, but it is preferable to mount the disk 9 on the upper and lower surfaces.

FIG. 3 illustrates a state in which the hollow cylindrical member formed as described above is pushed downward from the space between the outer cylinder 1 and the inner cylinder 2. As shown in FIG. 3, the extrusion is performed by pressing the hollow cylindrical object 10 from above with a cylinder (not shown) having a smaller diameter than the outer cylinder 1 and a larger diameter than the inner cylinder 2. Is possible. Although not shown, it is also possible to take out the hollow tubular article 10 by providing the inner cylinder with a structure that can be disassembled toward the inside and the outer cylinder with a structure that can be disassembled toward the outside.
The hollow cylindrical object 10 is then dried.

The dried hollow cylinder 10 is impregnated with a fiber binder under vacuum. As the fiber binder,
For example, synthetic resins such as silicone resins and epoxy resins can be used. The fiber binder is not particularly limited as long as it can bond the above-mentioned fibers to form a desired hollow cylindrical material (fiber tube), but it is said that it has heat resistance. It is preferable for the purpose. The fiber binder is used as a resin solution having an appropriate concentration. As shown in FIG. 4, the hollow cylindrical object 10 is placed in a vacuum container 11. The vacuum container 11 has a lid 12. Vacuum pump 1
At 3, the inside of the vacuum container 11 is evacuated. The fiber binder solution 15 in the tank 14 is supplied to the vacuum vessel 11, and under vacuum,
The hollow cylinder 10 is impregnated with a fiber binder. The hollow cylindrical object 10 is heated as needed.

FIG. 1A shows the fiber tube 10 obtained.
An example of 0 is shown. As shown in FIG. 1B, a long fiber tube 100 can be obtained by stacking a plurality of the fiber tubes 100 in the axial direction, and the fiber density unevenness can be obtained by the stacking. In addition, there is an advantage that it can be dealt with in the case where a part thereof is worn out more severely than other parts when it is used and a partial replacement is required. In the case of overlapping in this manner, for example, the flange portion of the fiber tube 100 is fluffed, or is reinforced with the reinforcing thread 16 as shown in FIG. 1 (B), or as shown in FIG. The fiber tube 100 may be provided with the convex portion 101, and the other fiber tube 100 may be provided with the concave portion 102.

In the present invention, as shown in FIG. 5B, the fiber tube 1 having the convex portion 103 facing inward is shown.
00 (hollow cylindrical object 10), the fiber tube 1
It is possible to form the fiber tube 100 in which rotation deviation from the roll core material 12 is unlikely to occur when the fiber tube 100 is used. FIG. 2
In the embodiment shown in FIG. 5, for example, when the cross section in the direction perpendicular to the axis of the inner cylinder 1 is not a perfect circle but a cross section having a concave portion, correspondingly, an example is shown in FIG. Hollow cylindrical object 1 having a convex portion 103 facing inward
0 (fiber tube 100) can be obtained. Instead of the embodiment shown in this example, the cross section in the direction perpendicular to the axis of the inner cylinder 1 is not a perfect circle but a cross section having a convex portion locally in the perfect circle, or has a polygonal shape. It can be changed as appropriate.

[0017]

EXAMPLES Next, the present invention will be further explained based on examples. Example 1. Approximately 1.5 aramid fibers (trade name: Twaron, manufactured by Enca) were disentangled to form short fibers (0.5 to 1.5 mm) with a length within a certain range as much as possible.
Denier aramid fiber and alcohol (ethanol)
Was prepared. The ratio of aramid fiber to alcohol in the fiber composition was 3:80.
An outer cylinder (diameter 78 mm) and an inner cylinder (48 m)
The space with m) was filled while sucking with a vacuum pump. Disks were attached to the upper and lower end surfaces of the outer cylinder. After suction time of 30 minutes, the upper disc was pressurized to 6.5 kg / cm ² , and compressed to a thickness of 32% of the thickness after suction,
The lower disk was removed, a hollow cylinder was extruded from the space using a cylinder (diameter 50 mm), and the disk was removed and then dried. The hollow cylindrical product that had undergone the drying step was placed in a vacuum container, the vacuum container was covered, and the inside of the vacuum container was evacuated to 700 mmHg (0.079 atm) using a vacuum pump. The fiber binder solution in the tank was supplied to a vacuum vessel, and the hollow cylindrical material was impregnated with the fiber binder under the above vacuum. Silicone resin was used as the fiber binder. Silicone resin is 2.5% by weight of silicone resin.
It was used as a silicone resin solution dissolved in a double amount of ethanol, and the ratio of the silicone resin solution and the aramid fiber was set to silicone resin solution 3: aramid fiber 1. Then, the hollow cylindrical material was pre-dried at 60 ° C. for 60 minutes and then at 190 ° C.
It was heated for 0 minutes to obtain a fiber tube. Through these steps, squeezing of the alcohol and silicone resin liquids, vaporization of the alcohol, and weight loss due to the crosslinking reaction of the silicone resin occur, and in the fiber tube after heating, alcohol is used.
Completely disappeared and the ratio of aramid fiber to silicone resin was 1: 1.

[0018]

【The invention's effect】

(1) According to the present invention, as described above, in a simple method,
The fiber tube can be obtained in a very short time. That is, since a conventional method of spirally winding a non-woven fabric is not used, a fiber tube can be obtained in a short time, a situation in which a gap is formed between the non-woven fabrics is avoided, and a high compression is achieved. The density contains fibers, and
A fiber tube with a uniform density can be obtained throughout, and the density can be freely selected. Further, unlike the conventional method in which a large number of donut-shaped nonwoven fabrics are fitted to a roll core material and compression-molded, it is not necessary to prepare a large number of discs (nonwoven fabrics) and the needling is performed. The processing does not take a lot of time. (2) On the other hand, with the conventional tuber-shaped felt, it is difficult to obtain one having a constant diameter.
One with a constant diameter that corresponds to the diameter of the space of the outer cylinder and the inner cylinder. Also, because the inner and outer surfaces are in contact with the cylindrical body to obtain a hollow cylindrical body, the surface is uniform and smooth. Becomes In addition, there is no need for a annealing process, and there is no need to prepare a base fabric or a fibrous web. Therefore, not only a highly uniform outer cylinder plate of a roll core material can be obtained in a short time, but also an inexpensive one can be obtained. (3) Further, in the hollow cylindrical product produced by the method of the present invention, the constituent fibers are three-dimensionally intertwined with each other, which are integrated by the fiber binder, and are uniform and smooth. The surface wear when used is remarkably reduced, and is about 1/2 of the roll using the conventional doughnut-shaped nonwoven fabric and about 1/3 of the roll using the tubby-like felt. Since the amount is small, a significant effect can be obtained in terms of life. (4) A hollow tubular body is formed from a fiber composition containing the fiber of the present invention and an organic solvent and / or water, and the hollow tubular body is impregnated with a fiber binder under vacuum to form a fiber tu. According to the method for obtaining the fiber, the fiber binder is first mixed in the fiber composition, and therefore the fiber composition containing the fiber binder, the fiber and the organic solvent is mixed with the outer cylinder and the inner tube. The space between the cylinder and the cylinder is filled to form a hollow cylindrical body, and the hollow cylindrical body is pressed to remove the hollow cylindrical body from the space between the outer cylinder and the inner cylinder to the outside. Compared with the method of obtaining a fiber, the fiber binder can be uniformly impregnated, and it is also easy to make it according to the manufacturing method. That is, the method is a method in which a hollow tubular body is once compressed and dried to form a hollow tubular body, and then the hollow tubular body is impregnated under vacuum to obtain a fiber tube. The resin liquid can be spread to obtain a fiber tube with less variation in the resin as a binder, and the concentration of the resin can be appropriately changed. Further, a fiber binder, fibers and an organic solvent are contained. In the case of using the fiber composition as described above, the oil agent originally attached to the fibers affects the binder and causes gelation, which can be prevented. Furthermore, as in the present invention, the fibers and the organic solvent and / or
Alternatively, when water is used, as can be seen from the device example shown in FIG. 2, since the oil agent originally attached to the fibers is washed away by the organic solvent or water, the adhesive strength of the binder is improved and the binder It can be used.

[Brief description of drawings]

FIG. 1A is a perspective view of a fiber tube showing an embodiment of the present invention, and FIG. 1B is an explanatory view of a case where a plurality of fiber tubes are piled up showing an embodiment of the present invention.

FIG. 2 is an explanatory view of a main part of a manufacturing process showing an embodiment of the present invention,

FIG. 3 is an explanatory view of a main part of a manufacturing process showing an embodiment of the present invention,

FIG. 4 is an explanatory view of a main part of a manufacturing process showing an embodiment of the present invention,

5A is a configuration diagram showing another embodiment of the present invention, FIG.
(B) is a block diagram showing still another embodiment of the present invention,

[Explanation of symbols]

 1 Outer Cylinder 2 Inner Cylinder 3 Fiber Composition 4 Wire Mesh, Synthetic Fiber Mesh or Filter 5 Mesh or Other Filter 6 Tank 7 Vacuum Pump 8 Pipe 9 Lid 10 Hollow Cylindrical 11 Vacuum Container 12 Lid 13 Vacuum Pump 14 Tank 15 Fiber binder (resin liquid) 100 Fiber tube

Claims (3)

[Claims] 1. A fiber tube formed by forming a hollow cylinder from a fiber composition containing fibers and an organic solvent and / or water, and impregnating the hollow cylinder with a fiber binder under vacuum. A process for producing a fiber tube for roll coating, which comprises obtaining a fiber. 2. A hollow cylindrical body is formed by filling a space between an outer cylinder and an inner cylinder with a fiber composition containing fibers and an organic solvent and / or water, followed by compression and drying. 2. The method for producing a roll-covering fiber tube according to claim 1, wherein the fiber tube is obtained by impregnating the hollow cylindrical body with a fiber binder under vacuum. 3. A roll characterized in that a plurality of the fiber tubes obtained in claim 1 or 2 are superposed in the axial direction.
A method for producing a fiber tube for coating a fiber.