JPH03236941A - Hollow material of reinforced plastic - Google Patents

Abstract

PURPOSE:To prevent the lowering of lightening, curing, resistance to wear and thermal expansion coefficient and also prevent the generation of electrification by using fibers of carbon, glass or the like and curing integrally by means of resin. CONSTITUTION:Carbon fibers or the like are used for a base material layer 12 formed with cloth wound on a core bar 11, a first winding layer 14 and a second winding layer 10. Said layers are bonded and cured by means of resin to be formed integrally. Particularly the winding angle of the first winding layer 14 to the second winding layer 15 is varied. A hollow material 10 of reinforced plastic thus manufactured is provided with elasticity, and at least an elastic layer 17 with conductivity is formed on its surface. Said elastic layer 17 is integrated with the base material layer 12 and both winding layers 14 and 15 by simply heating or heat pressurizing. Its surface is provided with conductivity by mixing a conductive fine powdery material on the whole of the layer or forming a conductive layer 16 on the surface of the simple elastic material.

Description

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

(Prior Art) Tubular hollow members are usually used to wind up relatively thin materials such as films and sheets. In other words, this hollow material is used to wind up the film, sheet, etc. by rotating the hollow material after fixing the end of a long film, sheet, etc. to it. 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 very thin (according to recent technology, it has become possible to produce 0.5 μm thick films in factories), and they have become very thin, such as cassette tapes, video tapes, etc. For products such as magnetic tapes that require a fairly high degree of homogeneity and high quality, considerable care must be taken to prevent wrinkles and tears when winding them into hollow materials before they are manufactured into products. It's starting to require attention. especially,
In the case of magnetic tape, if it is charged with static electricity during manufacturing or the like, it will have a subtle effect on the finished product, so it is necessary to avoid charging as much as possible during winding. Moreover, in the winding operation of engraving this hollow material, the hollow material must be rotated at a considerably high speed in order to improve efficiency.

In the manufacturing process of these films and sheets, especially the winding work, as these films and sheets become extremely delicate as mentioned above, conventionally, most Things that were not a problem are now brought into close focus. The properties required of the hollow material, including some of them, are listed below.

■This hollow material is rotated at high speed like two series,
In order to improve the ability to follow a film or the like during winding, the moment of inertia when rotated is preferably small, and therefore the weight of the hollow material is preferably light.

■Since a large amount of film, sheet, etc. is wound onto this hollow material, the overall weight after winding is considerable, but when transporting this material, it is necessary to use the hollow material. It will be done.

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.

■ Wrinkles must not occur on the film or sheet while winding it around the hollow material. When "wrinkles" occur, the "wrinkles" themselves not only reduce the product value, but also may cause damage to the next part of the film or sheet to be wound up. 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.

(2) The temperature of the hollow material may change 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 being conveyed is heated, or 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 cause the wrinkles described in item 1 to occur. If this heat cannot be avoided, the hollow material must not expand or contract due to heat, that is, must have a small coefficient of thermal expansion.

(2) Furthermore, static electricity may be generated during the winding of a hollow material such as a film.

When a film or the like is charged with this static electricity, it attracts dust. When dust adheres to the surface of a film, etc., it causes the same effect as the "wrinkles" mentioned above, that is, it causes damage to the next film, etc., and this is especially noticeable when the film, etc. is thin. becomes. Therefore, if consideration must be given to the adhesion of dust due to static electricity, the hollow material must be made of a material that is not electrically charged.

(2) In particular, when the film is a magnetic material such as a cassette tape or a videotape, static electricity charging poses a serious problem that significantly impairs the value of the product. Therefore, in the case of a hollow material for winding up such a magnetic film, it must not be electrically charged, and must at least have the property of dissipating static electricity.

■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 an adverse effect on the next film, etc., like the above-mentioned "wrinkles". . That is, the edges of this film form a step in the next film to be wound, and this step causes damage to the film. Therefore, it is preferable that the hollow shrine has such elasticity that it can absorb the step formed by the edge of the film at the initial stage of winding the film.

A conventional hollow member made of reinforced plastic of this kind is 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 formed by a 4-J groove and a metal header fitted onto the 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.

Furthermore, although this metal roll is said to use an extremely thin aluminum tube as its metal roll shell, it is thought that it would not be possible to ensure sufficient strength if the aluminum tube was used as the base. Furthermore, this metal roll
A carbon resin fiber layer must be formed on the inner peripheral surface of the metal roll shell, but when heat is applied to the metal roll, stress is generated internally due to the difference in the materials between the two, which causes the The roll itself may be bent. When this happens, the winding of film, etc.
Wrinkles, etc. may occur and the process cannot be performed properly. Therefore, for this metal roll, considerable consideration must be given to the materials 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 into consideration item (2) in item 1 at all.

Furthermore, Japanese Patent Application Laid-Open No. 60-63137 discloses a method for manufacturing a vibrator made of carbon fiber reinforced plastics,
This method is based on ``50% winding at a low angle of 30 degrees or less with respect to the axial direction of the vibrator.''
Regarding the manufacturing method of the vibrator made of Atsunai carbon fiber reinforced plastics having the above-mentioned structure, carbon fibers with a controlled resin impregnation amount of 20 to 35% by weight are wound in a desired composition ratio, and then a heat shrink tape is applied to the surface. A method for manufacturing a carbon fiber reinforced plastics vibrator, which is characterized by wrapping and curing by heating. ”. This carbon fiber reinforced plastic vibrator is
It is necessary to wrap heat shrink tape around the surface of the pipe and heat it to harden it, but the wrapped heat shrink tape has a completely smooth surface when it heats and hardens. There are no guarantees. Therefore, the matters shown in (1) to (4) above are not considered at all in this method.

In short, in the conventional technology for this kind of hollow shrine made of reinforced plastic, no one has yet been proposed that solves all of the problems (1) to (3) mentioned above.

(Problem to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and the problem to be solved is to improve the quality of rolled films, sheets, etc. by making them thinner and more precise. Conventional reinforced plastic hollow members of this kind have not yet been able to deal with the problem of corrosion.

The purpose of the present invention is to achieve weight reduction, hardness, wear resistance, and reduction in thermal expansion coefficient, and to prevent static electricity during initial winding. To provide a hollow material made of reinforced plastic that can be used without affecting the material to be wound up, such as a film.

(Means for Solving the Problems) The means taken by the present invention to solve the above problems are explained with reference to FIGS. 1 to 5 corresponding to the embodiments. A reinforced plastic hollow material formed by winding, comprising a base layer (12) formed by winding a cloth around a core bar (11), and a fiber on the surface of this base layer (12). (13) to the core metal (11
) The first winding layer (1
4), and on the surface of this first winding layer (14), fibers (1
The second winding layer (1) is formed by winding the second winding layer (1
5), and an elastic layer (15) formed by coating an elastic material such as rubber on the surface of the second winding layer (15).
17), and these base material layers (12) and the first winding layer (14).
), second winding layer (15) and elastic layer (17)
This is a reinforced plastic hollow material (10) J, characterized in that the elastic layer (17) is configured such that at least the surface side thereof is conductive.

That is, this reinforced plastic hollow material (10) is
Each base layer (12), first winding layer (14), and second winding layer (15) are made of glass fiber or carbon fiber, etc., and these are bonded and hardened with resin to form an integral shape. In particular, the first winding layer (14) and the second winding layer (14)
5) with a different winding angle.

This reinforced plastic hollow member (10) has elasticity and has an elastic layer (17) having conductivity on at least its surface. This elastic layer (17)
The base material layer (12) and both winding layers (14) (
15) by simply heating or heating and pressing, and as shown in the examples, a conductive fine powder material is mixed into the whole, or a conductive material is added to the surface of a simple elastic material. By forming the layer (16), at least the surface thereof is made conductive.

(Actions of the Invention) By adopting the above-described measures of the present invention, this reinforced plastic hollow member (10) has the following effects.

First, this reinforced plastic hollow member (10) is shaped entirely by fibers and resin made of glass or carbon, so its overall weight is determined by these materials. In other words, it is lighter in weight than conventional ones using metal.

Not only that, but this reinforced plastic hollow material (l
O) is because glass or carbon fiber (13) or the like is sequentially wound on the upper surface of the base material layer (12), and the winding angle is changed between the first winding layer (14) and the second winding layer (15). The gap between each first winding layer (14) and second winding layer (15) is completely filled, and the outer shape is close to a perfect circle. Therefore, each part of this reinforced plastic hollow material (10) has a homogeneous mass, so even if it is rotated at high speed, no "shaking" will occur. It has become.

In addition, this reinforced plastic hollow material (10) includes a base material layer (12) formed of carbon cloth or glass cloth, etc., and a fiber (13) made of glass, carbon, etc. on this base material layer (2). ), the base material layer (12), the first winding layer (14) and the second winding layer (15) are The winding layer (15) provides high strength as a whole. Moreover, these fibers (13) made of glass or carbon, such as carbon cloth or glass cloth, and the resin that makes them adhere to each other have low coefficients of thermal expansion.
The coefficient of thermal expansion in each layer of the reinforced plastic hollow material (10) is reduced, so even if heat is applied or the material is placed under conditions with large temperature differences, stress will be generated inside it. Never. Furthermore, this reinforced plastic hollow material (10) can be formed by sequentially winding each material upward.
This makes it easy to manufacture. In addition, since this reinforced plastic hollow member (10) has extremely high strength, it goes without saying that it has excellent wear resistance.

In addition, this reinforced plastic hollow member (10) has an elastic layer (17) having conductivity on at least the surface thereof.
) also has the following effects. That is,
The elastic layer (17
), since this is the outermost layer and is conductive, the charged magnetism of the magnetic tape such as a cassette or videotape that comes into direct contact with this elastic layer (17) is transferred to the magnetic tape. without touching anything directly,
It is possible to indirectly escape to the outside via this elastic layer (17). Moreover, this elastic layer (17
), it is sufficient to mix conductive feed such as carbon or metal powder, or simply form a conductive layer (16) on the surface of this elastic layer (17). It can be manufactured extremely easily without changing the characteristics of the hollow +4' (10) itself.

Furthermore, this reinforced plastic hollow shrine (10) also has the following effects due to its elastic layer (7). That is, in the elastic layer (17) of this reinforced plastic hollow material (1O), since this is located at the outermost layer and has elasticity, this elastic layer (17)
7) It is possible to embed the edge of the film or sheet that directly touches the inside. In other words, even if the edge of the film or sheet is initially raised, the next film or sheet that is wound presses it down, causing the edge of the film or sheet to bulge. It will sink into the elastic layer (17). This prevents "wrinkles" formed by the edges of the film or sheet, even if the film or sheet being wound is thin.
It is possible to prevent the occurrence of In addition, since the elastic layer (17) is elastic in this way, the reinforced plastic hollow material (10) is cut into rounds of a predetermined length, and each portion of the reinforced plastic hollow material (10) is cut into rings of a predetermined length. When used as various rollers in other machines, it has the potential to be quite useful due to its high roundness, high strength, abrasion resistance, and low coefficient of thermal expansion.

(Example) Next, reinforced plastic hollow material (10) according to the present invention
Embodiments will be described one by one with reference to the drawings, while also taking into account the manufacturing method.

FIG. 1 shows a reinforced plastic hollow member according to the present invention (
10) is shown, and this reinforced plastic hollow member (10) mainly consists of a base layer (12), a first winding layer (14), and a second winding layer (15). .

The base material layer (12) is made by winding prepreg glass cloth or carbon cloth in two layers around the core bar (11), which is the central material, and forms the bottom of the tank.
12) is for smoothing the inner surface of the completed reinforced plastic hollow member (10) and increasing 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 reason for applying the mold release agent is to make it easier to remove the core bar (11) from the completed reinforced plastic hollow member (10).

Further, in order to wind the base material layer (12) around the core bar (11), the fabric layer (12) is arranged so that its texture is diagonal with respect to the core bar (11). The reason is this base layer (12
), when winding the first winding layer (14) described later on top of the base material layer (14), the base material layer (14) is wound in the middle of this winding.
This is to prevent 2) from unraveling.

Further, in this embodiment, the number of turns of the base layer (12) is two, but the number is not limited to this, and as described below, the number of turns may be one or three or more. This base layer (12) is made of reinforced plastic hollow material (10
) Rather than guaranteeing the strength after completion of the winding layer (14), it is intended to facilitate and ensure the winding operation of the next first winding layer (14) and second winding layer (15), such as strengthening. Plastic hollow material (
10) If the diameter itself is small, one time is sufficient; on the other hand,
If the reinforced plastic hollow member (10) has a large diameter, it is sufficient to wind it three or more times. Note that this reinforced plastic hollow +4' (10) is manufactured with a considerably wide final diameter of about 5 mm to 300 mm.

The first winding layer (14) has fibers (13) on the − side of the base layer (12) that is rotated together with the core metal (11).
It is formed by sequentially winding. The fibers (13) forming this first winding layer (14) are made of inorganic fibers such as glass and carbon, or synthetic fibers such as nylon,
It is made into prepreg before being wound. Of course, this winding is performed with a predetermined tension applied to each fiber (13). The inclination angle of the fibers (13) forming this first winding layer (14) with respect to the axis of the core bar (11) is 45 degrees in the case of this example.
This is just a principle, and the inclination angle may be changed as necessary. At this angle of inclination, the core bar (11) is wound from one end to the other end with a predetermined gap, and when the other end is reached, the same winding operation is repeated at the opposite angle of inclination (135 degrees). I will do it. The number of layers formed by such winding (one layer consists of one turn of fiber (13)) was six in this example. This first winding layer (14) is the reinforced plastic hollow material (10)
The number of layers formed by the fibers (13) may be larger, since the strength etc. of the fibers (13) is the main part, but when forming a reinforced plastic hollow material (10) with a small diameter, it is necessary to have fewer layers. Good too.

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, the inclination angle of the fibers (13) forming the second winding layer (15) is approximately 75 degrees in this example, and the number of winding layers is three. At this inclination angle, as in the case of the first winding layer (14) described above, the core bar (11) is wound with a predetermined gap from one end side to the other end side, and when it reaches the other end, this time A similar winding operation is performed one after another at the opposite inclination angle (approximately 105 degrees). In this way, the reason why the inclination angle of the fibers (13) was changed compared to the case of the first winding layer (14) is that each gap of the fibers (13) forming the first winding layer (14) was changed. This is because it needs to be filled up. In other words, even if there is a gap due to some reason other than the intersection of the fibers (13) forming the first winding layer (14), there is a difference in the inclination angle from that 42. This is because this gap can be completely filled by winding the fiber (13). In addition, the number of turns of the second winding layer (15) is 3, which is less than that of the first winding layer (14), because the second winding layer (15) is made of reinforced plastic hollow material (IO). It is not intended to guarantee the strength of the reinforced plastic hollow material, but to ensure that the surface of the reinforced plastic hollow material (10) is completely smooth after completion. Therefore, this second winding layer (15) As long as the surface of the material (10) is smooth, the number of times of repeating may be smaller than in the case of this embodiment.

Further, in this reinforced plastic hollow member (10), an elastic layer (17) is formed on the outside of the second winding layer (15). This elastic layer (17) is made of natural rubber or synthetic rubber such as styrene rubber or propylene rubber, and after attaching this raw rubber to the outer layer of the second winding layer (15), it is heated and pressurized or heated. Vulcanize and form by pressing. 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.

What is important here is to make at least the surface of this elastic layer (F) electrically conductive, and there are two methods for achieving this, which can be broadly classified as follows. First, in the first method, a conductive fine powder material such as carbon paratha, metal paratha such as copper or iron, etc. is sufficiently added to the natural rubber or synthetic rubber material that is to be the elastic layer (17). After mixing and kneading, this elastic layer (
17). In this way, not only the entire elastic layer (17) becomes electrically conductive, but also its manufacture itself becomes easy. The third partial cross-sectional view of the reinforced plastic hollow member (10) formed in this way is
It is shown in the figure.

FIG. 4 shows an example in which the elastic layer (17) is formed by the second method, but in this example, a layer made of a simple rubber material is formed as the outer layer of the second winding layer (15), Furthermore, a conductive layer (16) made of conductive material such as plating or metal foil is formed on the surface. That is, the conductive layer (16) can be formed on the elastic layer (17) by directly forming it on the surface of the elastic layer (17) by plating or by pasting a conductive metal foil. This may be done by any method. Forming the elastic layer (17) by this method involves first forming the rubber layer, and then forming the conductive layer (16).
Since it is only necessary to form , it can be manufactured very easily.

In addition to the above-mentioned two representative examples, the following method is also available as a method for imparting conductivity to at least the surface of the elastic layer (17). That is, the surface of fibers such as glass fibers (13) to which metal is added or plated, or metal fibers, is placed in a material such as rubber constituting the elastic layer (17). This ensures conductivity through the metal-containing fibers partially exposed on the elastic layer (17).

In addition, in the reinforced plastic hollow material (10) formed as described above, before each surface finishing, that is, after each layer and each coating has hardened, the core metal (1
1) is extracted. To extract this core metal (11),
This can be done even better if the core metal (11) is coated with a mold release agent, and the core metal (11) is machined with the ends of each layer locked in the locking members. This is done by forcibly pulling it out. After that, each of these reinforced plastic hollow members (10) is surface-finished, and the reinforced plastic hollow members (10) are
The unnecessary ends of 0) are cut off to create a finished product.

The reinforced plastic hollow material constructed as described above (
The circularity of No. 10) was 6/100, which was more accurate than the conventional circularity of 15/100, and the Young's modulus was 1800 kgf/mm. In addition, we measured the coefficient of thermal expansion when carbon filaments were used as the fibers (13) and the proportion of carbon filaments in the entire reinforced plastic hollow material (10) was measured, as shown in Figure 5. .

(Effects of the Invention) As detailed above, in the reinforced plastic hollow material (10) according to the present invention, as exemplified in the above embodiment, first, each base material layer (12), the first winding layer ( 14) and the second winding layer (15) are made of fibers (13) made of carbon or glass, and each of these base material layers (12) and the first winding layer (
14) and the second winding layer (15) are integrally cured with resin, this reinforced plastic hollow material (10) is relatively lightweight and has high strength. When it is rotated at high speed and a film, sheet, etc. is wound on its surface, it does not bend or bulge, and it has good followability when winding the film, sheet, etc. In addition, this reinforced plastic hollow material (10) uses materials with a small coefficient of thermal expansion for all of its materials, so in addition to the above, it does not cause wrinkles or damaged parts on the film or sheet. It is possible to reliably wind these without any problems.

Moreover, in this reinforced plastic hollow member (10), since the elastic layer (17) having conductivity was formed on the outside of the second winding layer (15), this elastic layer (17) was formed on the outside of the second winding layer (15).
), the reinforced plastic hollow member (10) has excellent conductivity. Therefore, this reinforced plastic hollow material (10) is not charged with static electricity and can prevent dust from adhering to its surface. It is an optimal core material for winding raw films before being coated with magnetic material when manufacturing tapes and the like.

Furthermore, this reinforced plastic hollow member (10) has some elasticity on the surface of the reinforced plastic hollow member (10) due to its elastic layer (17). 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. Elastic layer (1
7), so even if the film or sheet is wound at high speed, the reinforced plastic hollow material (10) can be wound securely without damaging the film or sheet. It is something that can be done several times. In addition, even if dust adheres to the surface of this reinforced plastic hollow material (10), it will be absorbed in the same way as the edges of the film or sheet described above, so the film or sheet It is possible to reliably prevent damage such as.

[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 a reinforced plastic hollow material according to the present invention, FIG. 4 is a partially enlarged sectional view of another reinforced plastic hollow material, and FIG. 5 is a partially enlarged sectional view of a reinforced plastic hollow material according to the present invention. It is a graph showing a change in thermal expansion of a plastic hollow material. Explanation of symbols 10... Reinforced plastic hollow material, 11... Core bar, 12... Base material layer, 13... Fiber, 14 First winding layer, 15... Second winding layer, 16・
... Conductive layer, 17... Elastic layer. that's all

Claims (1)

[Claims] A reinforced plastic hollow material formed by winding prepreg fibers, comprising a base layer formed by winding cloth around a core metal, and a surface of this base layer. a first winding layer formed by winding the fibers at a predetermined angle with respect to the axial direction of the core; and a first winding layer with the fibers on the surface of the first winding layer. A second winding layer formed by winding the winding layer at different angles, and an elastic layer formed by covering the surface of the second winding layer with an elastic material such as rubber, The base layer, the first winding layer, the second winding layer, and the elastic layer are integrally cured with each other, and the elastic layer is configured to have conductivity at least on its surface side. A reinforced plastic hollow material featuring: