JPH07187516A - Core for raw fabric, film and yarn etc. - Google Patents

Abstract

PURPOSE:To provide a core enabled for lightening, hardening, having frictional resistance, flattening a surface and reducing heat expansion rate and manufactured easily. CONSTITUTION:A core has a cylindrical core body 10 forming an outer layer and being winded raw fabric film etc., on a surface and a core metal 20 stored in this core body 10 with leaving a designated space R and being a rotary shaft at winding and a connecting plate 30 for connecting with this core metal 20 and the core body respectively and forms a supporting layer 40 of an insulating member in the designated space R between the core body 10 and the core metal 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core used for winding a relatively thin material such as a raw material, a film or a sheet, or a thread.

[0002]

2. Description of the Related Art A tubular core is usually used for winding a raw material, a relatively thin material such as a film or sheet, or a thread. That is, this core is used for the work of winding the raw fabric or the film or sheet by rotating the core after fixing the end of the long raw fabric or the film or sheet to the core. It plays an important role in winding and protecting the material or film. Then, the original fabric, the film, the sheet or the like is transported to a predetermined processing step while being wound around the core.

However, the original fabric, the film, the sheet, etc. are very thin as in recent years (according to the latest technology, 0.5 μm products can be produced in the factory), cassettes, etc. For magnetic tapes such as tapes and video tapes that require a fairly high degree of homogeneity and high quality, prevent the formation of wrinkles and tear at the time of winding on a core before commercialization. It requires considerable precautions such as prevention. Moreover, in the winding operation for the core, the core must be rotated at a considerably high speed in order to improve efficiency.

Particularly in the winding operation of each manufacturing process of such a raw material or film or sheet,
When these original fabrics, films, sheets, etc. become very delicate as described above, it will be noticed that there has been little problem in the past. The properties required for the core, including some of them, are listed below.

(1) This winding core is rotated at a high speed as described above, but in order to make the followability with respect to the original fabric or the film at the time of winding good, the moment of inertia when rotated is small. Better, therefore, the weight of the core should be lighter. (Lightness)

(2) Since a large amount of original fabric, film, sheet or the like is wound on this core, the total weight after completion of winding is considerable, but when transporting this. It is performed using the core. Further, when the raw fabric or the film or sheet is commercialized as a tape or the like, the core is put on another machine and rotated, and the transportation and installation work is also performed using the core. Therefore, the core itself is required to have a considerable strength. (Strength)

(3) No "wrinkles" should be formed on the roll or the film or sheet while winding the roll. When "wrinkles" occur, the "wrinkles" themselves not only reduce the product value, but also cause damage to the material or the portion to be wound next such as a film or sheet at that portion. This is particularly noticeable in the case of an original fabric or a thin film or sheet. Therefore, in order to prevent such "wrinkles" from occurring, the surface of the core has perfect smoothness, and the core itself bends during rotation. Don't (Smoothness)

(4) There is a possibility that the temperature of the core may change considerably during the period from the initial stage to the final stage of the winding of the material or film or sheet on the core. This may be due to the fact that the material or the film or the like being conveyed is tinged with heat, or that heat is generated due to mechanical conditions such as high-speed rotation. However, as described above, "wrinkle" should not occur in the original fabric or film, but when the core is expanded and contracted by heat, this also causes the above-mentioned "wrinkle". If this heat cannot be avoided, the core must be one that does not expand or contract due to heat, that is, one that has a small coefficient of thermal expansion. (Non-thermal expansion)

As a conventional core made of this kind of reinforced plastic, for example, there is one proposed in Japanese Patent Publication No. 59-45843. The metal roll proposed in this publication states that "a carbon fiber reinforced resin layer is attached to the inner peripheral surface of a metal roll shell in a state in which the carbon fiber array direction and the metal roll shell axial direction coincide with each other. A metal roll comprising a roll body attached to the roll body and a metal header fitted to the end of the roll body and engaged with the rotation support shaft.

However, in this metal roll, the carbon resin fiber layer must be formed on the inner peripheral surface of the metal roll shell, but even if it is simply considered, another member is formed on the inner peripheral surface of the pipe material. Is very difficult to fix. Further, this metal roll is said to use an extremely thin aluminum tube as the metal roll shell, but it is considered that the strength cannot be secured so much when the aluminum tube is used as the base material. Further, this metal roll must form a carbon resin fiber layer on the inner peripheral surface of the metal roll shell, but when heat is applied to the metal roll, internal stress is generated due to the difference between the materials of the two. It may occur, which may cause the metal roll itself to bend. In such a case, "wrinkle" or the like occurs when the original fabric or the film is wound up, and it cannot be satisfactorily performed. Therefore, in 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.

Further, Japanese Unexamined Patent Publication No. 60-63137 discloses a method for manufacturing a carbon fiber reinforced plastic pipe, which is "3 in the axial direction of the pipe.
A method for manufacturing a pipe made of thick carbon fiber reinforced plastics, which comprises 50% or more of low-angle winding of 0 degree or less, and a carbon fiber in which the amount of resin to be impregnated is controlled to 20 to 35% by weight, in a desired composition ratio After applying, a heat shrink tape is wrapped around the surface and cured by heating, which is a method for producing a carbon fiber reinforced plastic pipe ”.

In this carbon fiber reinforced plastics pipe, it is necessary to wrap a heat shrink tape around the surface of the pipe and heat cure the heat shrink tape. The heat shrink tape wrapped and wrapped is heat cured. There is no guarantee that the surface will be perfectly smooth when exposed to. Therefore, what is shown in (3) above is not considered at all in this method.

Therefore, for example, in Japanese Utility Model Publication No. 5-15499, "an inner cylinder having a circular cross section and an outer cylinder having a circular cross section, which are concentrically arranged at a distance from each other, and an inner cylinder and an outer cylinder. A continuous core reinforcing fiber arranged in the longitudinal direction of the core and having a content of 50 to 75% by volume. The outer diameter of the outer cylinder is 100 to
A core for glass fiber cloth having a length of 200 mm and at least a cross winding portion having the same sectional shape has been proposed. This winding core is a glass fiber cloth that is to be wound, it is possible to sufficiently secure the strength required to wind this, and it is possible to reduce the overall weight because it is hollow. It is believed that there is.

However, the actual fairness is 5-15499.
In the winding core disclosed in the publication, as described in the fourth column, the eighth line and thereafter of the publication, "a plurality of radial ribs 4 connecting the inner cylinder 2 and the outer cylinder 3, Rib 4 is core 1
It extends in parallel to the axis line of the "." (See FIG. 10), so that the core is very thin, such as the original film or film for video tape as described above. When trying to wind a large amount of, the following problems occur. That is, the rib 4 is
As shown in FIG. 3, if the core 1 extends in parallel with the axis, the portion of the outer tube 3 not supported by the ribs 4 is likely to be deformed. Because this core 1 is
As a whole, the fiber-reinforced plastic is used as a material and is manufactured by using "pultrusion molding using continuous fibers" (the same column, column 4, line 28 and below), "reinforcing continuous fiber is a core. 1 is arranged in the longitudinal direction, so that the winding core 1 is weak against the force applied in the radial direction by winding the original fabric or the film.

In short, the conventional technique of this type of core has solved all of the above-mentioned problems (1) to (4) when the material or film is to be wound. Had not been proposed yet.

[0016]

The present invention has been made in view of the above circumstances, and the problems to be solved are as follows.
The conventional core of this kind has not yet been dealt with to improve the quality such as the thinness and precision of the material to be wound or the film or sheet.

The object of the present invention is to reduce the weight, the hardness, the wear resistance, the smoothing of the surface and the reduction of the coefficient of thermal expansion, and the manufacturing is easy. To provide a winding core.

[0018]

[Means for Solving the Problems] Means adopted by the present invention for solving the above problems are shown in FIG.
Describing with reference to FIG. 9, "a core used for winding a raw material, a film, a yarn, or the like, which constitutes an outermost layer and on which a raw material or a film is wound. A cylindrical core body 10 and a core metal 20 that is housed in the core body 10 leaving a predetermined space R and serves as a rotating shaft during winding or the like.
And a connecting plate 30 for connecting the core metal 20 and the core body 10 to each other, and a support layer 40 made of a cushioning material in a predetermined space R between the core body 10 and the core body 20. It is a core 100 "for a raw fabric or a film or the like characterized by being formed.

That is, in the core 100, the core body 10 which is the outermost layer and the core metal 20 which is housed in the core body 10 through a predetermined space R are integrally connected by the connecting plates 30 located at both ends. In addition, the support layer 40 is positively formed in the entire predetermined space R. Although various materials can be applied as the cushioning material forming the support layer 40, the core body 1 can be manufactured while reducing the weight of the core 100 as a whole.
In order to achieve reliable support for the zero cored bar 20,
The foamable resin 41, the hollow spherical body 42, the foamed resin disk 43, or the honeycomb sheet 44 as shown in the embodiment.
Is preferred.

[0020]

The present invention adopts the above-mentioned means, so that the core 100 has the following functions.

First, in the core 100 according to the present invention, the core body 10 is made of a fiber such as glass or carbon and resin, and the core body 1
With respect to the inside of 0, the core metal 20 is connected to each connecting plate 3
Since the support layer 40 made of lightweight foaming resin 41 and the like is formed in the predetermined space R, the total weight of the support layer 40 is smaller than that of the conventional one using only metal. It is lightweight.

In particular, in the core 100 according to the following embodiments, the core body 10 constituting the core 100 has glass or carbon fibers 13 sequentially wound around the upper surface of the base material layer 12,
Moreover, since the winding angles of the first winding layer 14 and the second winding layer 15 are changed, each of the first winding layer 14 and the second winding layer 15 is different.
Since the gap between them is completely filled and the coating layer 16 made of resin is formed on the outermost layer to make the surface a polished surface, the outer shape is close to a perfect circle. Therefore, since the winding core 100 has a uniform mass as a whole, "blur" does not occur at all even when the winding core 100 is rotated at a high speed.

The core body 10 constituting the core 100 is composed of a base layer 12 made of prepregized carbon cloth or glass cloth, and glass or carbon or the like on the base layer 12. Fiber 1
Since it is mainly composed of the first winding layer 14 and the second winding layer 15 formed of 3, the base material layer 12 and the first winding layer 14 are formed.
The second winding layer 15 has high strength as a whole. In addition, since the carbon cloth or glass cloth, the fiber 13 made of glass or carbon, and the resin that adheres them have a low coefficient of thermal expansion, the coefficient of thermal expansion in each layer of the core body 10 is reduced. Therefore, even if heat is applied or the temperature difference is large, no stress is generated inside.

Particularly, in this core body 10, since the coating layer 16 is formed as the outermost layer and the surface thereof is a polished surface having a surface roughness of 1 to 1.5S, the surface of the core body 10 is The smoothness is excellent. When the surface of the coating layer 16 is polished to form a polished surface, the coating layer 16 has a sufficient thickness, so that the second winding layer 15 and the like inside can be prevented from being exposed on the surface. It is a thing.

Further, the core body 10 has a predetermined space R
The support layer 40 is integrated with the central core metal 20 through the support layer 40 inside, and the support layer 40 is a foaming resin 41, a hollow spherical body 42, a foaming resin disc 43, or a honeycomb sheet 4 which is a cushioning material.
Since it is formed by 4, the winding core body 10 is firmly supported by the core metal 20 that serves as a rotating shaft during winding, without being pinched or deformed. As a result, even if the winding core 100 is rotated at a high speed (several thousands of rpm or more), wrinkles may occur on the material or film to be wound on the surface, or conversely, partially. It does not stretch or even break. Further, when a raw fabric or a film is wound at high speed, a so-called "winding force" is applied to the core 100, but the core body 10 is made of a material having high strength and rigidity as described above. Since the core body 10 is supported by the core layer 20 by the support layer 40, the core 100 is not deformed or bent.

Moreover, in the core 100, when the core 100 is used many times, the coating layer 16 of the core body 10 becomes dirty and damaged, so that the surface of the coating layer 16 is polished and regenerated. But this coating layer 1
Even with respect to the force applied during the polishing work of No. 6, since the core 100 having the above-described structure has sufficient rigidity, it is possible to perform the sufficient polishing work. In other words, the core 100 is highly reusable by polishing the coating layer 16.

[0027]

EXAMPLES Next, the respective examples of the winding core 100 according to the present invention will be described in order with reference to the drawings while taking into consideration the manufacturing method thereof.

FIG. 1 shows a perspective view of a winding core 100 according to the present invention. The winding core 100 of this embodiment is mainly composed of a base material layer 12 and a first winding layer as shown in FIG. 14, second winding layer 15 and coating layer 1
A core body 10 composed of 6 and 6 is provided. FIG. 2 shows a state in which the molded core metal 11 is still inserted for the sake of explanation. However, the molded core metal 11 is to be removed after the winding core body 10 is completed. It is not a constituent element of the winding core 100 according to.

The base material layer 12 is a molded core metal 11 serving as the center.
In addition, the prepregized glass cloth or carbon cloth is wound in two layers, and the base material layer 12 is used for smoothing the inner surface of the core body 10 after completion and increasing the inner diameter accuracy. It is a thing. In this case, the molding core 11 is of course close to a perfect circle, and its surface is coated with a release agent as required. The release agent is applied so that the work can be easily performed when the molded core bar 11 is pulled out from the completed core body 10.

The base material layer 12 is wound around the molding core bar 11 by arranging it so that the cloth is oblique to the molding core bar 11. The reason is that, when a first winding layer 14 described later is wound on the base material layer 12, the base material layer 12 is not loosened during the winding.

Further, in this embodiment, the base material layer 1
The number of turns of 2 is set to 2 but is not limited to this, and may be 1 or 3 or more as will be described below. This base material layer 12 does not guarantee the strength of the core body 10 after it is completed, but rather, the following first winding layer 14 and second winding layer 15 are provided.
The winding work can be performed easily and surely. For example, if the diameter of the core body 10 itself is small, it can be performed once, while if the diameter of the core body 10 is large, it can be wound three times or more. Just turn it. As the core body 10,
A product having a final diameter of 25 mm to 400 mm and a length of about 300 mm to 6000 mm is manufactured.

The first winding layer 14 is a molded core metal 1.
It is formed by sequentially winding (winding) the fibers 13 on the upper surface of the base material layer 12 rotated together with 1. Fibers 13 forming this first winding layer 14
Is formed of an inorganic fiber such as glass or carbon, or a synthetic fiber such as nylon, and is formed into a prepreg before being wound. Of course, this winding is performed with a predetermined tension applied to each fiber 13. The inclination angle of the fiber 13 forming the first winding layer 14 with respect to the axis of the molded core bar 11 is 45 degrees in this embodiment. Molded core metal 1 with this inclination angle
The first winding is wound from one end side to the other end side with a predetermined gap, and when it reaches the other end, the same winding work is sequentially performed with an opposite inclination angle (135 degrees). The number of layers formed by such winding (one winding of the fiber 13 is one layer) was 6 layers in this example. Since the first winding layer 14 serves as a main portion for exerting strength and the like of the winding core 100, the number of layers formed by the fibers 13 may be larger, but in the case of forming the winding core 100 having a small diameter. May be less.

The second winding layer 15 is basically formed by the same method as the case of forming the first winding layer 14, but the inclination angle and the number of windings with respect to the molding core bar 11 are different. That is, the angle of inclination of the fibers 13 forming the second winding layer 15 is 75 degrees in the present embodiment, and the number of turns is three layers. At this inclination angle, as in the case of the first winding layer 14 described above, the molding core metal 11 is wound from one end side toward the other end side with a predetermined gap, and when it reaches the other end, the reverse inclination is applied. Similar winding work is sequentially performed at an angle (105 degrees). In this way, the inclination angle of the fiber 13 is changed as compared with the case of the first winding layer 14 because it is necessary to fill each gap of the fiber 13 forming the first winding layer 14. . That is, even when there is a gap in a portion other than the intersecting portion of the fibers 13 forming the first winding layer 14 due to some cause, the fibers 13 having different inclination angles are wound from above. By doing so, this gap can be completely filled.

The number of windings of the second winding layer 15 is three, which is smaller than that of the first winding layer 14 because the second winding layer 15 has the winding core 1
The strength of the winding core 100 is not guaranteed, but the surface of the winding core 100 after completion is made completely smooth. Therefore, the surface of the winding core 100 is smooth by the second winding layer 15. If so, the number of times may be smaller than that of the present embodiment.

In the core 100 according to the present invention, the outermost layer is the coating layer 16 made of epoxy resin.
Was applied, and the thickness was 0.3 to 0.4.
Further, the surface of the coating layer 16 was mechanically polished to finish the surface for 1S to 1.5S to obtain a polished surface.

The core body 10 having the above-described structure has a circularity of 6/100, which is 15/1 of the conventional one.
The accuracy was improved from that of No. 00, and the Young's modulus was 1800 kgf / mm. In the core 100 formed as described above, the molded core metal 11 is extracted before the surface finishing, that is, after each layer and each coating is cured. This molded cored bar 11 can be taken out better if the molded cored bar 11 is coated with a release agent, and the end of each layer is locked by the locking member. The molding core metal 11 is forcibly pulled out by a machine. Thereafter, the core body 10 is surface-finished, and unnecessary ends of the core body 10 are cut to obtain a finished product.

The cored bar 20 housed in the core body 10 as described above through the predetermined space R is literally made of metal, and as shown in FIGS. It is the axis. It should be noted that the inside of the core body 10 is provided at both left and right ends in order to improve draining of the completed core 100 in washing and the like, and to facilitate removal of electrostatically attached dust. It is a completely open tubular body.

The cored bar 20 must be fixed and integrated with the core body 10, and this is done by a connecting plate 30 formed in the shape of a donut disk. The cored bar 20 fixed as shown in FIG. 3 is located at the axial center of the core body 10. In other words, the cored bar 20 serves as a rotary shaft when the winding core 100 is rotated, and has the rigidity required for the rotary shaft.

Core body 10 of cored bar 20 by connecting plate 30
Various types of integration are adopted for
As shown in (a) of FIG. 4 and FIG. 5, a flange portion that abuts the end surface of the core body 10 is formed on the outer circumference of the connecting plate 30, and the end surface of the core body 10 is formed by this flange portion. You may implement so that the core main body 10 and the core metal 20 may be integrated, covering. The connecting plate 30 shown in FIG.
In this case, the chucking plate 50 is integrally formed on the outer surface of the winding core 50.
It is adapted to be attached to a device for rotating 00. Of course, the connecting plate 30 has a structure in which the core body 10 and the cored bar 20 have the same length and are integrated between them, as shown in FIG. 5B, for example. In this case, the shape of each constituent member of the winding core 100 can be simplified, and it is particularly suitable for forming the winding core 100 having a small diameter.

The connection plate 30 is integrated with the core body 10 and the cored bar 20 by, for example, screwing a portion of the connection plate 30 into which the core body 10 and the cored bar 20 are fitted, and screwing the same. It may be performed by forming the connecting plate 30 on the corresponding parts of the core body 10 and the core metal 20 and screwing the connecting plate 30 to the core body 10 and the core metal 20. Also, the connecting plate 30
The outer diameter and the like of the fitting portion may be the same as the corresponding portions of the winding core body 10 and the cored bar 20, and an adhesive may be applied and forced fitting may be performed to integrate them. Of course, the screw and the adhesive may be used in combination.

A supporting layer 40 made of a cushioning material is formed in the predetermined space R formed as described above. As the supporting layer 40, as shown in FIGS. Foaming resin 41, hollow spherical body 4 as shown in FIG.
2, foamed resin disk 43 as shown in FIG. 8, or FIG.
The honeycomb sheet 44 as shown in FIG. 4 is appropriately adopted, and each case will be sequentially described with the manufacturing method thereof taken into consideration.

The support layer 40 shown in FIGS. 3 to 6 is formed of a foaming resin 41. The foaming resin 41 is, for example, as shown in FIG. 6, the chucking plate shown in FIG. Before mounting 50, the whole is stood up, and the material of the foaming resin 41 is ordered from below by the injection nozzle by using each mounting hole formed in the connecting plate 30 for fixing the chucking plate 50. By doing so, the predetermined space R is filled. The reason for injecting the material of the foamable resin 41 from the lower side is that the supporting layer 40 is completely filled in the predetermined space R by this, and the surplus material is of the upper connecting plate 30. It comes out from the mounting hole, so you can remove it.

The support layer 40 shown in FIG. 7 is formed by using a hollow spherical body 42 made of synthetic resin, which has recently been provided at a low cost. The hollow spherical body 42 is shown in FIG. As shown, the semi-finished products that have been stood up may be put into the predetermined space R from above. In order to prevent each hollow spherical body 42 from moving within the predetermined space R, the above-mentioned foamable resin 41 is formed on the surface of each hollow spherical body 42.
It is advisable to apply the above-mentioned material or another adhesive and then put it in. Since each hollow spherical body 42 is hollow,
The weight of the entire winding core 100 after completion is not so increased, and since each hollow spherical body 42 is a sphere, the core body 10 can be supported with sufficient rigidity. Will be things. The formation of the support layer 40 using the hollow spherical bodies 42 can be very easily formed.

The above-mentioned foaming resin 41 and hollow spherical body 42
Although the cost of the material is slightly higher, the support layer 40 can be produced at a lower cost by using the foamed resin disk 43 as shown in FIG.
Can be formed. That is, a large number of foam resin discs 43, which are doughnut-shaped discs as shown in FIG. 8, are punched out from a foamable synthetic resin plate made of polypropylene or the like, and these are sequentially formed on the outer periphery of the cored bar 20. Close and fit together. Of course, the diameter of the hole of each foamed resin disk 43 is the same as the outer diameter of the cored bar 20, and the outer diameter of each foamed resin disk 43 is the same as the inner diameter of the core body 10. When the cored bar 20 having a large number of such foamed resin discs 43 fitted therein is fitted into the core body 10, each foamed resin disc 43 constitutes the support layer 40. If an adhesive is applied to the surface of each foamed resin disk 43 before fitting into the core body 10, the core body 10 and the cored bar 20 are integrated by each foamed resin disk 43. The conversion can be performed more reliably.

Further, the support layer 40 to be formed in the predetermined space R may be constructed by using a honeycomb sheet 44 as shown in FIG. The honeycomb sheet 44 is formed by partially connecting strips made of paper or a thin metal plate to each other. When the honeycomb sheet 44 is unfolded, it has a hexagonal columnar space as shown in FIG. The core metal 2 can be formed continuously.
It is wound around the surface of No. 0 and integrated with an adhesive. Then, by fitting the cored bar 20 whose surface is covered with the honeycomb sheet 44 into the core body 10, each honeycomb sheet 44 constitutes the support layer 40. An adhesive may be applied to the front surface side of each honeycomb sheet 44 so that each honeycomb sheet 44 and the inner surface of the core body 10 are bonded.

As described above, when the honeycomb sheet 44 is used as the support layer 40, a large number of strips of paper or the like are provided in the predetermined space R as shown in FIG. Since the partition walls are formed in a continuous state, these partition walls reliably support the core body 10 with respect to the cored bar 20.

In the core 100 of this embodiment,
As shown in (a) of FIG. 1 and FIG. 2, a mark 17 is formed at a predetermined position of the winding core body 10, and the mark 17 clearly indicates the chucking position of the chucking plate 50. . The weight of the roll 100 or the core 100 around which a film or the like is wound is considerable, and when the core 100 is hung on a supporting device or a rewinding device, the position of the core 100 is determined to some extent from the beginning of the work. It is often necessary to keep it in this case.
Is very useful.

[0048]

As described above in detail, in the present invention,
As illustrated in each of the above-mentioned examples, "a core used for winding a raw material, a film, a yarn, etc., which constitutes an outermost layer and has a surface on which the raw material or the film is wound. A cylindrical core body 10 and a core metal 2 that is housed in the core body 10 leaving a predetermined space R and serves as a rotating shaft during winding or the like.
0, a connecting plate 30 that connects the core 20 and the core body 10 to each other, and a support layer 40 made of a cushioning material in a predetermined space R between the core body 10 and the core 20. Is characterized in that it is possible to achieve weight reduction, hardness, wear resistance, surface smoothing, and reduction in coefficient of thermal expansion, and it is easy to manufacture. It is possible to provide a winding core that can be used.

That is, according to the winding core 100 of the present invention,
Since the core body 10 is integrally formed on the outside of the cored bar 20 serving as the rotating shaft via the support layer 40 made of the expandable resin 41 or the like, even if the core 100 has a large diameter, It does not increase the overall weight (achieves light weight). Further, with the above-described structure, the rigidity of the core 100 is sufficient irrespective of its lightweight, and the strength of the core 100 is sufficient to withstand the winding force of the original film or the film. It can be made high (securing strength). Further, the core body 10 on which the original fabric or the film is directly wound has
Since the core layer 20 is supported on the entire inner surface of the core bar 20 by the support layer 40 composed of 1 or the like, the core body 10 is not always partially bent or deformed. No wrinkles will be generated on the rolled stock or film (ensuring smoothness).

Further, according to the core 100, since the core body 10 around which the raw fabric or film is directly wound is made of a material having a small thermal expansion coefficient, it is possible to prevent mechanical heat generated during winding. Since the core body 10 does not undergo large thermal expansion and is supported by the core metal 20 through the support layer 40, the core body 10 to be wound on the surface of the core body 10 is not affected. There is no occurrence of "wrinkles" in the fabric or the film (non-thermal expansion property is secured).

In the core 100, since the core body 10 is firmly supported by the core metal 20 via the support layer 40, scratches generated in the coating layer 16 of the core body 10 are prevented. Even when the stain is removed by polishing or grinding, the winding core 100 does not bend at all, and therefore, it is possible to ensure a perfect circular state in all parts of the winding core 100, and to reuse the winding core 100. Can be done sufficiently.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a winding core according to the present invention.

FIG. 2 is a partial perspective view showing the structure of a core body that constitutes the core.

FIG. 3 is a view showing the same core, in which (a) is a side view,
(B) is a sectional view taken along line 1-1 of FIG. 4.

4 is a vertical cross-sectional view of the winding core shown in FIG.

FIG. 5 is a partial cross-sectional view showing an example of a connecting plate that integrates the core body and the core bar.

FIG. 6 is a cross-sectional view showing a manufacturing method when the support layer of the winding core according to the present invention is made of a foamable resin.

FIG. 7 is a cross-sectional view showing a manufacturing method when the support layer of the winding core according to the present invention is formed of a hollow spherical body.

FIG. 8 is a cross-sectional view showing a manufacturing method when the support layer of the winding core according to the present invention is made of a foamed resin disk.

[Fig. 9] Fig. 9 is a cross-sectional view showing a manufacturing method when the support layer of the winding core according to the present invention is made of a honeycomb sheet.

FIG. 10 is a cross-sectional view showing a conventional winding core.

[Explanation of symbols]

 100 Core 10 Core Main Body 11 Molded Core 12 Base Layer 13 Fiber 14 First Winding Layer 15 Second Winding Layer 16 Coating Layer 20 Core Bar 30 Connecting Plate 40 Support Layer 41 Foaming Resin 42 Hollow Spherical Body 43 Foaming Resin Disc 44 Honeycomb sheet 50 Chucking plate

Claims (1)

[Claims] 1. A winding core used for winding a raw fabric, a film, a thread, etc., which is a tubular core body constituting an outermost layer and having the raw fabric film or the like wound on the surface thereof. A core bar that is housed in the core body with a predetermined space left and serves as a rotating shaft during winding, and a connecting plate that connects the core bar and the core body to each other, and A core for a raw film or the like, wherein a support layer made of a cushioning material is formed in a predetermined space between the core body and the core metal.