JPH0356896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reinforced plastic hollow member for winding relatively thin materials such as films and sheets.

(Prior Art) A tubular hollow member is usually used to wind up relatively thin materials such as films and sheets. That is, this hollow material is used for winding the film, sheet, etc. by fixing the end of a long film, sheet, etc. to it, and then rotating the hollow material. It plays an important role in protection. Then, this film, sheet, etc. is transported to a predetermined processing step while being wound around the hollow material.

However, in recent years, these films and sheets have become extremely thin (according to very recent technology, it has become possible to produce 0.5 μm thick films in factories), and magnetic materials such as cassette tapes and video tapes have become available. For tapes that require a fairly high degree of homogeneity and high quality, great care must be taken to prevent wrinkles and tears when winding them around hollow materials before they are made into products. It's becoming necessary.

In the manufacturing process of such films and sheets, especially the winding work, as these films and sheets become extremely delicate as mentioned above, conventionally there was almost no problem. Things that would otherwise have happened are brought to light. The properties required of the hollow material, including some of them, are listed below.

This hollow material is rotated at high speed as described above, but in order to improve the ability to follow the film etc. during winding, it is better to have a small moment of inertia when rotating. The lighter the weight, the better. (Lightweight) Since a large amount of film, sheet, etc. is wound into this hollow material, the overall weight after winding is considerable, but when transporting this material, the hollow material is used. It is done as follows. Further, when commercializing a film or sheet as a tape or the like, the hollow material is mounted on another machine and rotated, and the transportation and installation work is also performed using the hollow material. Therefore, this hollow material itself is required to have considerable strength.

Further, during the winding of the film, sheet, etc. onto the hollow material, "wrinkles" must not occur in the film or sheet. When "wrinkles" occur, the "wrinkles" themselves not only reduce the value of the product, but also may cause damage to the next part of the film, sheet, etc. at that part. This is particularly noticeable when the film or sheet is thin. Therefore, in order to prevent such "wrinkles" from occurring, the hollow member must not be bent during rotation. (Strength) There is a possibility that the temperature of the hollow material changes considerably during the period from the initial stage to the final stage of winding the film, sheet, etc. onto the hollow material. This may be due to the fact that the film or the like that is being conveyed is hot, or that heat is generated due to the mechanical conditions of high speed rotation. However,
As mentioned above, films and the like must not be wrinkled, but when the hollow material expands and contracts due to heat, this can also cause the wrinkles. If this heat cannot be avoided, the hollow material must not expand or contract due to heat, that is, it must have a small coefficient of thermal expansion. (Non-thermal expansion property) Furthermore, if we consider the case of winding up an extremely thin film, etc., the edges of the film at the beginning of winding will have the above-mentioned "wrinkles".
This adversely affects the film, etc. that is transported next. That is, the end portion of this film forms a step in the next film to be wound, and this step results in damage to the film. Therefore, it is preferable that the hollow member has such elasticity that it can absorb the step formed by the end of the film at the initial stage of winding the film. (Elasticity) As a conventional hollow member made of this kind of reinforced plastic, there is one proposed in, for example, Japanese Patent Publication No. 59-45843. The metal roll proposed in this publication has the following features: ``A carbon fiber reinforced resin layer is pasted on the inner circumferential surface of a metal roll shell in such a way that the arrangement direction of the carbon fibers matches the axial direction of the metal roll shell. A metal roll consisting of a roll body attached to the roll body and a metal header fitted to an end of the roll body and engaged with a rotation support shaft. However, this metal roll requires a carbon resin fiber layer to be formed on the inner peripheral surface of the metal roll shell, but if you think about it simply, it is difficult to fix another member to the inner peripheral surface of the pipe material. This is extremely difficult. Further, although this metal roll is said to use an extremely thin aluminum tube as its metal roll shell, it is thought that it is not possible to ensure sufficient strength if the aluminum tube is used as the base material. Furthermore, this metal roll must have a carbon resin fiber layer formed on the inner circumferential surface of its metal roll shell, but when heat is applied to the metal roll, the difference in the materials between the two causes Stresses may develop, which may cause the metal roll itself to flex. If this happens, the film, etc., cannot be wound up properly due to wrinkles and the like. Therefore,
For this metal roll, considerable consideration must be given to the material of the metal roll shell and the carbon resin fiber layer formed on the inner peripheral surface thereof. Note that this metal roll does not take any of the above considerations into account.

Furthermore, Japanese Patent Application Laid-open No. 60-63137 discloses a method for manufacturing a carbon fiber reinforced plastic pipe, which requires ``a low angle winding of 30 degrees or less with respect to the axial direction of the pipe.''
Regarding the manufacturing method of thick-walled carbon fiber-reinforced plastic pipes containing 50% or more, the amount of resin to be impregnated
A method for manufacturing a carbon fiber-reinforced plastic pipe, which comprises wrapping carbon fibers controlled at 20 to 35% by weight in a desired composition ratio, wrapping a heat shrink tape around the surface, and curing the pipe by heating. ”. This carbon fiber-reinforced plastic pipe requires wrapping a heat-shrinkable tape around the surface of the pipe and curing it by heating. There is no guarantee that the surface will be completely smooth. Therefore, the above-mentioned matters are not taken into consideration at all in this method.

In short, in the conventional technology for this type of reinforced plastic hollow material, no one has yet been proposed that solves all of the above-mentioned problems.

(Problems to be solved by the invention) The present invention has been made in view of the above-mentioned circumstances.
The problem to be solved is that conventional hollow materials made of reinforced plastics of this kind have not been able to cope with the need for higher quality such as thinning and precision of rolled films and sheets.

The purpose of the present invention is to reduce the weight, hardness, abrasion resistance, and coefficient of thermal expansion of a material to be wound, such as a film, in the initial stage. An object of the present invention is to provide a hollow material made of reinforced plastic that can be processed without affecting the quality of the material.

(Means for Solving the Problems) The means taken by the present invention to solve the above problems will be explained with reference to FIGS. 1 to 4 corresponding to Examples. Prepreg fibers It is a reinforced plastic hollow material formed by winding a core metal 11 and a base material layer 12 formed by winding a prepreg cloth around a core metal 11, and a fiber on the surface of this base material layer 12. 13 is wound at a predetermined angle with respect to the axial direction of the core metal 11, and a first winding layer 14 is formed. A second winding layer 15 formed by winding the winding layer 13 at an angle different from the above-mentioned angle, and further on the surface of the second winding layer 15,
The base material layer 12 and the first winding layer 1 are provided with an elastic layer 16 formed by covering an elastic material such as rubber.
4. A reinforced plastic hollow material 10 characterized in that the second winding layer 15 and the elastic layer 16 are hardened by heat processing.

That is, this reinforced plastic hollow member 10
In this case, each base layer 1 is made without using any metal material.
2. The first winding layer 14 and the second winding layer 15 are formed by mainly using glass fiber or carbon fiber, and bonding and hardening these with resin. The winding angle between the winding layer and the second winding layer 15 is changed.

Further, the reinforced plastic hollow member 10 according to the present invention has an elastic layer 16 formed on its surface, and thereby has elasticity on its surface.

(Function of the Invention) By employing the above-described measures of the present invention, each reinforced plastic hollow member 10 has the following function.

First, since the reinforced plastic hollow member 10 according to the present invention is entirely made of fibers and resin mainly made of glass or carbon, the weight of the whole is determined by these materials. In other words, it is lighter than conventional metals. In addition, this reinforced plastic hollow member 10 has glass or carbon fibers 13 sequentially wound on the upper surface of the base layer 12, and the winding angle is controlled by the first winding layer 14 and the second winding layer 15. Because of this change, the gaps between each of the first winding layer 14 and the second winding layer 15 are completely filled, and the outer shape is close to a perfect circle. Therefore, each part of this reinforced plastic hollow member 10 has a homogeneous mass, so even when it is rotated at high speed, no "shaking" occurs at all. ing.

Moreover, this reinforced plastic hollow member 10 is
A base material layer 12 formed of prepreg carbon cloth or glass cloth, and a first winding layer 14 and a second winding layer 14 formed of fibers 13 made of glass, carbon, etc. on this base material layer 12. These base material layers 12,
The first winding layer 14 and the second winding layer 15 provide high strength as a whole. Moreover, since the fibers 13 made of carbon cloth, glass cloth, glass, carbon, etc., and the resin that makes them adhere to each other have low coefficients of thermal expansion, the coefficients of thermal expansion of each layer of the reinforced plastic hollow material 10 are low. Therefore, even if heat is applied to it or it is placed under conditions of large temperature difference, no stress will be generated inside it. Since the reinforced plastic hollow member 10 can be formed by sequentially winding each material upward, it can be manufactured easily. Note that this reinforced plastic hollow member 10 has extremely high strength, so it goes without saying that it has excellent wear resistance.

Furthermore, the reinforced plastic hollow member 10 not only has the above-mentioned functions, but also has the following functions due to its elastic layer 16. That is, since the elastic layer 16 of the reinforced plastic hollow member 10 is located at the outermost layer and has elasticity, the edge of the film or sheet that directly touches the elastic layer 16 is It is now possible to embed it in In other words, even if the edge of the film or sheet is initially raised, the next film or sheet to be wound will press down on it and the edge of the film or sheet will rise. This causes the elastic layer 16 to sink. Thereby, even if the film or sheet to be wound is thin, it is possible to prevent the occurrence of "wrinkles" formed by the edges of the film or sheet. Since the elastic layer 16 is elastic in this way, the reinforced plastic hollow material 10 is cut into rings of a predetermined length, and each part of the reinforced plastic hollow material 10 is used in various types of other machines. When used as rollers, it has the potential to be of considerable utility due to its high roundness, high strength, abrasion resistance, and low coefficient of thermal expansion.

(Example) Next, examples of the reinforced plastic hollow member 10 according to the present invention will be sequentially described with reference to the drawings, while also taking into consideration the manufacturing method thereof.

FIG. 1 shows a partially cutaway perspective view of a reinforced plastic hollow member 10 according to the present invention, and this reinforced plastic hollow member 10 mainly includes a base layer 12, a first winding layer 14, a second winding layer 14, and a second winding layer 14. It consists of a dewing layer 15 and an elastic layer 16.

The base material layer 12 is constructed by winding prepreg glass cloth or carbon cloth in two layers around a core bar 11, which is the central material.This base material layer 12 is made of reinforced plastic after completion. This is to make the inner surface of the hollow member 10 smooth and to improve the accuracy of the inner diameter. In this case, the core bar 11 is naturally close to a perfect circle, and a release agent is applied to the surface of the core bar 11 if necessary. The release agent is applied to make it easier to remove the core bar 11 from the reinforced plastic hollow member 10 after completion.

Further, in order to wind the base material layer 12 around the core metal 11, the fabric layer 12 is arranged so that its texture is oblique to the core metal 11. The reason for this is to prevent the base material layer 12 from unraveling during the winding when a first winding layer 14, which will be described later, is wound on the base material layer 12.
Further, in this embodiment, the number of turns of the base material layer 12 was set to two, but the number is not limited to this, and as described below, the number of turns may be one or three or more times. Rather than ensuring the strength of the reinforced plastic hollow material 10 after it is completed, this base material layer 12 facilitates and reliably winds the next first winding layer 14 and second winding layer 15. For example, if the diameter of the reinforced plastic hollow material 10 itself is small, it may be wound once; on the other hand, if the reinforced plastic hollow material 10 has a large diameter, it may be wound three times or more. It's good. Note that this reinforced plastic hollow member 10 is manufactured with a considerably wide final diameter of 5 mm to 300 mm.

The first winding layer 14 is formed by sequentially winding the fibers 13 on the upper surface of the base layer 12 that is rotated together with the core metal 11. The fibers 13 forming the first winding layer 14 are made of inorganic fibers such as glass and carbon, or synthetic fibers such as nylon, and are made into prepreg before being wound. Of course, in this winding, each fiber 1
3 with a predetermined tension applied. In this embodiment, the inclination angle of the fibers 13 forming the first winding layer 14 with respect to the axis of the core bar 11 is 45 degrees. At this angle of inclination, the core metal 11
It is wound from one end to the other end with a specified gap, and when it reaches the other end, the angle of inclination is reversed (135 degrees).
Then, the same winding work is performed one after another. In this example, the number of layers formed by such winding (one layer is one winding of the fiber 13) was six. Since this first winding layer 14 is the main part that provides the strength etc. of the reinforced plastic hollow material 10, the number of layers formed by the fibers 13 may be as large as possible, but In the case of forming the reinforced plastic hollow member 10, the number may be small.

The second winding layer 15 is basically formed by the same method as forming the first winding layer 14, but differs in the angle of inclination with respect to the core bar 11 and the number of turns. That is,
Fibers 1 forming this second winding layer 15
The inclination angle of No. 3 is 75 degrees in this example,
Moreover, the number of turns is three layers. At this angle of inclination,
As in the case of the first winding layer 14 described above, the core metal 11 is wound from one end to the other end with a predetermined gap, and when it reaches the other end, the inclination angle is reversed (105 degrees). Then, the same winding work is performed one after another.
In this way, the inclination angle of the fibers 13 was changed compared to the case of the first winding layer 14 because the fibers 13 forming the first winding layer 14 were changed.
Even if there is a gap due to some reason other than the intersection of the two, by winding the fibers 13 with different inclination angles over the gap,
This is because this gap can be completely filled. Moreover, the reason why the number of turns of the second winding layer 15 is three layers, which is smaller than that of the first winding layer 14, is that
5 does not guarantee the strength of the reinforced plastic hollow material 10, but is intended to ensure that the surface of the reinforced plastic hollow material 10 is completely smooth after the elastic layer 16 is formed and completed. Therefore, as long as the surface of the reinforced plastic hollow member 10 can be made smooth through the second winding layer 15, the number of times of winding may be less than that of this embodiment.

FIG. 3 shows a partial vertical sectional view of a reinforced plastic hollow member 10 according to the present invention.
In the reinforced plastic hollow member 10 according to the present invention, an elastic layer 16 is formed on the outside of the second winding layer 15. This elastic layer 16 is made of natural rubber or synthetic rubber such as styrene rubber or propylene rubber, and after attaching these raw rubbers to the outer layer of the second winding layer 15, it is heated and pressurized. Formed by sulfurization. The raw rubber may be attached by winding a sheet of raw rubber of a predetermined thickness a necessary number of times to obtain a predetermined thickness. The use of raw rubber in the form of a sheet is advantageous because surface finishing is not required at all or only a simple finishing is required.

The reinforced plastic hollow member 10 constructed as described above has a circularity of 6/100, which is higher in accuracy than the conventional one, which has a circularity of 15/100.
Moreover, its Young's modulus was 1800 kgf/mm. Furthermore, the coefficient of thermal expansion was measured when a carbon filament was used as the fiber 13 and the proportion of the carbon filament in the entire reinforced plastic hollow member 10 was measured, and the results were as shown in FIG.

In the case of the reinforced plastic hollow member 10 formed as described above, the core bar 11 is extracted before its surface is finished, that is, after each layer and each coating is hardened. This extraction of the core bar 11 can be carried out even better if a mold release agent is applied to the core bar 11, and the core bar 11 can be pulled out with the ends of each layer locked in the locking members. This is done by forcibly pulling out the gold 11 using a machine. Thereafter, each reinforced plastic hollow member 10 is subjected to surface finishing, and unnecessary ends of each reinforced plastic hollow member 10 are cut to form a finished product.

(Effects of the Invention) As detailed above, in the reinforced plastic hollow material 10 according to the present invention, each base material layer 12, the first winding layer 14 and the second winding layer are The layer 15 is constructed by using carbon or glass fibers 13, and by integrally curing each of these base material layers 12, the first winding layer 14, and the second winding layer 15 with resin. As a result, this reinforced plastic hollow material 10 is relatively lightweight and has high strength, so it can be rotated at high speed and a film, sheet, etc. can be wrapped around its surface. It does not bend or wobble during winding, and has good followability when winding films, sheets, etc. In addition, this reinforced plastic hollow material 10
uses materials with a small coefficient of thermal expansion, and in conjunction with the above, it is possible to reliably wind films, sheets, etc. without causing wrinkles or damaged parts. It is.

Further, in the case of the reinforced plastic hollow member 10 according to the present invention, since the elastic layer 16 is formed on the outside of the second winding layer 15, this elastic layer 1
6, the reinforced plastic hollow member 10 has some elasticity on its surface. Therefore, when winding a film, sheet, etc. on the surface of this reinforced plastic hollow material 10, even if the first end of the film, sheet, etc. Since the elasticity of the layer 16 absorbs the energy, even if the film, sheet, etc. is wound at high speed, the reinforced plastic hollow material 10 will not damage the film, sheet, etc. It allows reliable winding.

Furthermore, even if dust adheres to the surface of the reinforced plastic hollow member 10, it will be absorbed in the same manner as the edges of the film, sheet, etc. described above, so that the film, sheet, etc. due to adhesion of dust, etc. It is possible to reliably prevent damage.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a schematic structure of a reinforced plastic hollow material according to the present invention, and FIG. 2 is a schematic structure of an apparatus used for manufacturing the reinforced plastic hollow material according to the present invention. The front view shown in FIG. 3 is a partially enlarged sectional view of the reinforced plastic hollow material according to the present invention, and FIG. 4 is a graph showing the change in thermal expansion of the reinforced plastic hollow material depending on the amount of carbon fiber. Explanation of symbols, 10... Reinforced plastic hollow material, 11... Core metal, 12... Base material layer, 13... Fiber, 1
4...first winding layer, 15...second winding layer, 16...elastic layer.

Claims (1)

[Scope of Claims] 1. A reinforced plastic hollow material formed by winding prepreg fibers, comprising a base material layer formed by winding prepreg cloth around a core; a first winding layer formed by winding fibers on the surface of the base layer in a state inclined at a predetermined angle with respect to the axial direction of the core metal;
a second winding layer formed by winding the fibers on the surface of the first winding layer at an angle different from the above-mentioned angle; and a further surface of the second winding layer. and an elastic layer formed by covering with an elastic material such as rubber, and the base material layer, the first winding layer, the second winding layer and the elastic layer are cured by heating and pressurizing. Reinforced plastic hollow material characterized by