JP6839958B2 - Core material and manufacturing method of core material - Google Patents

Description

The present invention relates to a cylindrical core material for winding a film, a sheet, or the like, and a method for producing the core material.

Conventionally, the core material used for winding rolls of paper, sheets, films, etc. of paper making and printing machines is usually rotated at high speed with the transportation and winding of films, etc., and can withstand high-speed rotation. It is required to have bending strength and to be lightweight so that the rotational inertia is small.

In order to meet such demands, a core material made of fiber reinforced plastic (FRP), which has features such as light weight, high rigidity, and high strength as compared with a metal tube body, is used (for example, Patent Documents). 1).

Japanese Unexamined Patent Publication No. 62-117732

In recent years, sheets, films, and the like have become thinner, and in order to prevent the occurrence of bending and wrinkles when winding the sheet or film, the above-mentioned core material may be accommodated by increasing the outer diameter dimension. To increase the outer diameter, the wall thickness may be increased, but the weight may increase.

Therefore, in the core material described in Patent Document 1, in order to reduce the weight, the outer diameter dimension is increased without changing the wall thickness, and a cylindrical resin bush is formed on the inner peripheral portions at both ends in the length direction. Was fixed by adhesive.

However, in order to prevent eccentricity with respect to winding, it is necessary to insert the resin bush into the inner peripheral portions of both ends in the length direction of the core material with high accuracy and fix them by adhesion. Further, the resin bush inserted in this way may have insufficient adhesion to the inner peripheral surface of the core material.

If the adhesion is insufficient, the rotating shaft of the winder is inserted into the bush, and the weight of the core material or the weight of the wound sheet or film causes the center axis of the bush to be inadequate. There is a problem that the central axis of the core material is eccentric downward.

Therefore, an object of the present invention is to provide a core material having improved adhesion between the core material main body and the bush.

In order to solve the above problems, the present invention is a cylindrical body made of fiber reinforced plastic, and has a core material main body having an adhesive layer at the inner peripheral portions of both end portions in the length direction, and an inner peripheral portion of the adhesive layer. It is possible to adopt a structure having a cylindrical bush to be adhesively fixed to the bush and having a linear notch extending in the length direction.

According to this configuration, the bush has both inner edges in the circumferential direction that form a linear notch, so that the entire circumference of the outer peripheral portion can be aligned with the outer peripheral portion of the adhesive layer. Can be brought into close contact with the adhesive layer over the entire circumference.

In the above configuration, if the notch is formed over the entire length of the bush in the length direction, the outer peripheral portion of the bush is brought into close contact with the adhesive layer not only on the entire circumference but also on the entire length in the length direction. Can be made to.

If the core material body adopts a configuration in which the inner peripheral portions of both end portions in the length direction have a rough surface portion having a surface roughness larger than that of the inner peripheral portions other than the both end portions in the length direction, an adhesive layer is formed on the rough surface portion. The adhesive strength between the core material body and the bush is improved by the bite.

Further, it is possible to adopt a configuration in which the layer thickness of the adhesive layer has a thickness obtained by bisecting the dimensional difference between the inner diameter dimension of the core material main body and the outer diameter dimension of the bush. According to this configuration, when the bush is fixed to the adhesive layer, the amount of eccentricity of the central axis of the bush with respect to the central axis of the core material can be minimized.

The core material according to the present invention has a step of winding a reinforcing fiber impregnated with a resin around a core metal to form a cylindrical core material main body, and an adhesive on the inner peripheral portions of both ends in the length direction of the core material main body. To form an adhesive layer, a step of inserting a cylindrical bush having a linear notch extending in the longitudinal direction inside the adhesive layer in the radial direction, and a step along the inner peripheral portion of the bush. It is manufactured by a manufacturing method including a step of pressing outward from the inner peripheral portion of the bush by a pair of pressing pieces having an arcuate cross section.

Since the core material of the present invention is fixed in a state where the bush is in close contact with the inner peripheral portions of both end portions in the length direction of the core material body over the entire circumference in the circumferential direction, the amount of eccentricity of the central axis of the bush with respect to the central axis of the core material. Can be suppressed.

Longitudinal sectional view of the core material of the embodiment according to the present invention. Enlarged vertical cross-sectional view of the main part of the core material as above Same as above perspective view showing the bush Explanatory drawing showing the state of fixing the bush to the core material body of the same as above. A perspective view showing another form of the bush as above.

Hereinafter, the core material according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3.
The core material according to this embodiment is used for winding paper, sheets, films, etc. of paper making and printing machines.

The core material 1 has a cylindrical core material main body 2 and an adhesive layer 3 formed on the inner peripheral portions of both ends of the core material main body 2 in the length direction, and a cylindrical shape fixed to the inner peripheral portion of the adhesive layer 3. Has a bush 4 and.

The core material main body 2 is a cylindrical body made of fiber reinforced plastic, which is formed by a filament winding method in which fibers impregnated with a resin are wound in a core metal having a predetermined outer diameter in a tubular shape. As this resin, for example, a resin generally used for manufacturing FRP tubes, such as an unsaturated polyester resin and an epoxy resin, can be adopted. Examples of the fiber impregnated with the resin include glass fiber, carbon fiber, aramid fiber, and ceramic fiber.

In the core material main body 2, a rough surface portion 2a having a surface roughness larger than that of the inner peripheral portion other than the both end portions in the length direction is formed on the inner peripheral portion of both end portions in the length direction. The core material body 2 has an adhesive layer 3 formed of an adhesive formed on the entire circumference of the rough surface portion 2a on the inner side in the radial direction.

The inner diameter dimension R2 of the core material main body 2 is set larger by the radial thickness of the adhesive layer 3 and the bush 4 with respect to the standard value R1 of the inner diameter dimension required for the core material 1.

Further, the core material main body 2 is formed by the above-mentioned filament winding method so that the dimensional tolerance of the inner diameter dimension R2 is ± 0.25 mm in the entire area in the circumferential direction and the length direction.

The rough surface portion 2a of the core material main body 2 does not necessarily have to be formed as long as the anchor effect of the adhesive layer 3 with respect to the inner peripheral portion of the core material main body 2 can be sufficiently secured.

The adhesive layer 3 is formed over the entire circumference of the inner peripheral portions of both end portions in the length direction of the core material main body 2. The adhesive layer 3 is formed in a range slightly longer than the total length of the bush 4 from both ends in the length direction of the core material main body 2. The layer thickness of the adhesive layer 3 is a thickness obtained by bisecting the dimensional difference between the inner diameter dimension R2 of the core material main body 2 and the outer diameter dimension R3 of the bush 4 (see FIG. 2).

The adhesive layer 3 is made of a photocurable resin such as an ultraviolet curable resin or a thermosetting resin. As the thermosetting resin, for example, a polyester resin, an unsaturated polyester resin, and an epoxy resin are used. The adhesive layer 3 fixes the bush 4 to the inner peripheral portion of the core material main body 2 by receiving light or heat or curing at room temperature.

The bush 4 is a cylindrical resin member and has a linear notch 5 extending over the entire length in the length direction (see FIG. 3). The inner diameter dimension R4 of the bush 4 is set to be a standard value R1 of the inner diameter dimension required for the core material 1.

The bush 4 is formed so as to have an inner diameter dimension within ± 0.13 mm with respect to the inner diameter dimension (R1) in the entire circumferential direction and the longitudinal direction. Further, the inner peripheral surface of the bush 4 has a surface roughness smaller than that of the inner peripheral surface of the core material main body 2. As the material of the bush 4, the same material as that of the core material main body 2 can be applied.

Further, the bush 4 of this embodiment has a linear notch 5 extending over the entire length in the length direction. The notch 5 is not limited to a straight line and may be curved, but is preferably linear from the viewpoint of workability in manufacturing the bush 4. Here, the linear notch means that the gap is sufficiently smaller than the peripheral length of the bush 4 in the circumferential direction and looks linear.

If the bush 4 of this embodiment can be brought into close contact with the adhesive layer 3 over the entire circumference of the inner peripheral portions of both end portions of the core material main body 2 in the length direction, one end in the length direction is as shown in FIG. It may have a linear notch 6 extending in the length direction from the edge to the vicinity of the other end.

In this case, the length of the notch 6 of the bush 4 is preferably 70% or more with respect to the total length of the bush 4. This is because if it is shorter than 70%, it is difficult for the bush 4 to be brought into close contact with the adhesive layer 3 over the entire circumference of the inner peripheral portions of both end portions in the length direction of the core material main body 2.

The bush 4 may have notches 5 at a plurality of locations in the circumferential direction, or may have notches 6 at a plurality of locations in the circumferential direction.

The core material 1 of this embodiment is configured as described above, and is manufactured by the following steps.
As a preparation for the production of the core material 1, a cylindrical body is produced by resin molding or the like. Then, the cylindrical body is processed to produce a bush 4 having an inner diameter dimension R4 in which a linear notch 5 is formed over the entire length in the length direction thereof.

Next, the manufacturing process of the core material 1 will be described. First, the fiber impregnated with the liquid resin is wound around a mandrel as a core metal to cure the resin, and then the mandrel is pulled out to form a cylindrical core material main body 2. Here, the outer diameter of the mandrel is the same as the inner diameter R2 of the core material body 2 described above.

Subsequently, sandblasting is performed over the entire circumference of the inner peripheral portions of both end portions of the core material main body 2 in the length direction to form the rough surface portion 2a. The rough surface portion 2a is formed in a range slightly longer than the total length of the bush 4 from both end edges of the core material main body 2 in the length direction.

Further, an adhesive is applied to the rough surface portion 2a of the core material main body 2 to form the adhesive layer 3. Then, a cylindrical bush 4 having a linear notch 5 extending in the length direction is inserted inside the adhesive layer 3 in the radial direction.

With the bush 4 inserted in the adhesive layer 3, the pressing jig 13 shown in FIG. 4 presses the bush 4 outward from the inner peripheral portion in the radial direction (see FIG. 4).

Here, the pressing jig 13 includes a pair of pressing pieces 10 and 11 and an extendable shaft-shaped member 12 that moves them inward or outward in opposite directions. The pressing pieces 10 and 11 are formed of a plate-shaped member having an arc-shaped cross section, and the width of the core material main body 2 in the length direction is formed to be the same as the length of the bush 4.

Further, the outer surface 10a of the pressing piece 10 on the outer side in the radial direction has an arcuate cross section along the inner peripheral portion of the bush 4. The radius of curvature of the outer surface 10a is set to 1/2 of the above standard value R1.

As shown in FIG. 4, the arc length (arc length) of the outer surface 10a along the circumferential direction of the bush 4 is set to, for example, about 1/3 of the peripheral length of the bush 4. It suffices to have a length that can be reliably pressed against the core material main body 2. The outer surface 11a on the outer side of the pressing piece 11 in the radial direction is also formed in the same manner as the outer surface 10a of the pressing piece 10.

The shaft-shaped member 12 is formed by screwing two screw rods 12a on the same straight line via a high nut 12b. The outer end of each screw rod 12a (the end opposite to the high nut 12b) is connected to the center of the inner surfaces 10b and 11b on the inner side of the pair of pressing pieces 10 and 11 in the radial direction. The shaft-shaped member 12 is in a state where the outer surfaces 10a and 11a of the pair of pressing pieces 10 and 11 are located on the same cylindrical surface.

The pressing jig 13 is arranged inside the bush 4 at a position where the notch 5 of the bush 4 can be pressed by the pressing piece 10, and in this state, the bush 4 is pressed outward from the inside in the radial direction.

In the bush 4 pressed by the pressing jig 13, the gap of the notch 5 formed in the entire length is widened outward in the circumferential direction, and the entire outer peripheral surface thereof can be brought into close contact with the adhesive layer 3 of the core material main body 2. .. As a result, the adhesion between the core material main body 2 and the bush 4 is improved.

Further, the thickness of the adhesive layer 3 is a value obtained by bisecting the dimensional difference between the inner diameter dimension R2 of the core material main body 2 and the outer diameter dimension R3 of the bush 4. Therefore, when the entire outer peripheral surface of the bush 4 is brought into close contact with the adhesive layer 3, the amount of eccentricity of the central axis of the bush 4 with respect to the central axis of the core material 1 can be minimized.

In the above-mentioned manufacturing method, as the bush 4, a bush 4 having a linear notch 6 extending in the length direction from one end edge in the length direction to the vicinity of the other end can be used, if necessary. .. In this case, the bush 4 is preferable because it is easy to insert it into the inner peripheral portion of the core material main body 2 and its posture is stable.

1 Core material 2 Core material body 2a Rough surface 3 Adhesive layer 4 Bush 5, 6 Notch 10, 11 Press piece 10a, 11a Outer surface 10b, 11b Inner surface 12 Shaft-shaped member 12a Screw rod 12b High nut 13 Press jig R1 Standard value R2, R4 Inner diameter dimension R3 Outer diameter dimension

Claims (4)

It is a cylindrical body made of fiber reinforced plastic, and has a core material main body having an adhesive layer at the inner peripheral portions of both end portions in the length direction, and a cylindrical bush fixed to the inner peripheral portion of the adhesive layer. The bush has a linear notch extending in the length direction, and the inner peripheral portion of both end portions in the length direction of the core material body has a surface roughness higher than that of the inner peripheral portion other than both end portions in the length direction. big has a rough surface, said bushing spread gap of the notch in the circumferential direction outwardly, der Ru core material which is brought into close contact with the outer peripheral surface thereof in the adhesive layer of the core material body. The core material according to claim 1, wherein the notch is formed over the entire length of the bush in the length direction. The core material according to claim 1 or 2, wherein the layer thickness of the adhesive layer has a thickness obtained by bisecting the dimensional difference between the inner diameter dimension of the core material main body and the outer diameter dimension of the bush. The method for manufacturing a core material according to any one of claims 1 to 3 , wherein a reinforcing fiber impregnated with a resin is wound around a core metal to form a cylindrical core material main body, and the core thereof. A cylindrical shape having a step of applying an adhesive to the inner peripheral portions of both ends in the length direction of the material body to form an adhesive layer and a linear notch extending in the radial direction inside the adhesive layer in the length direction. A method for manufacturing a core material, comprising a step of inserting a bush and a step of pressing outward from the inner peripheral portion of the bush by a pair of pressing pieces having an arcuate cross section along the inner peripheral portion of the bush.

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