JP3416119B2 - Manufacturing method of winding core - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to relates to a manufacturing method of a winding core for winding a thin elongated material film or sheet or the like formed of a synthetic resin or paper.

[0002]

2. Description of the Related Art As a winding core for winding a thin long material such as a film or a sheet, various winding cores mainly composed of carbon fiber, glass fiber, plastic fiber, paper or cloth have been proposed. Therefore, the applicant also discloses, for example, Japanese Patent Publication No. 3-8938 or Japanese Patent Publication No. 3-5689.
Various concrete proposals have been proposed by the publication No. 6 and the like. These already proposed winding cores are for winding a thin long material such as a film or sheet formed of synthetic resin or paper at high speed,
Very high strength is required, and sufficient smoothness of the surface is required so that the long material wound up does not have wrinkles.

Further, it is also desired that this type of winding core is not a so-called one-way type, but that it can be used repeatedly. Therefore, if the surface is scratched, for example, the surface is polished, or the surface layer is formed again, and the surface is regenerated to have a smooth flat surface. That is, in the conventional winding core, a surface made of so-called synthetic resin is formed on the surface of the winding core so that the smoothness can be easily ensured, and the core can be recycled and reused.

The surface made of this conventional synthetic resin is formed by coating the surface of a core material made of the above-mentioned material with a thermosetting resin and curing it in a furnace. However, it is necessary to repeat this coating / curing operation several times or more, because a single coating / curing cannot form a surface having a thickness capable of being re-polished as described above. Met. Therefore, it takes a considerable amount of time and labor to manufacture the conventional winding core, and the cost thereof is also considerable.

Further, when manufacturing the core core material itself, there is a limit to the length that can be manufactured. On the other hand, coating the surface of the core core material with a thermosetting resin, etc. If possible, if it can be performed continuously for a long time, the efficiency can be improved. Traditionally,
The cores of a specified length were butted against each other and conveyed so that their cores were aligned so that coating with thermosetting resin etc. could be performed continuously. It is not so easy to convey while aligning.

Further, as a conventional method for forming a surface layer on the surface of the core core material using a thermosetting resin or the like, a means as shown in FIG. 8A is adopted. .
That is, while sending a plurality of core core material of a predetermined length in a state of butting against each other, a surface layer made of a thermosetting resin or the like is formed as a continuous one on each surface thereof, and the cured surface layer is The method of cutting C in the vicinity of the abutting portion of the core material has been adopted.

With such a method, the abutting points between the core cores cannot be confirmed from the outside, so that FIG.
As shown in, the cutting C must be performed at two positions with a certain interval including the abutting position. However, this cutting C is performed in a state where the thermosetting resin forming the surface layer is not completely cured, because the surface layer must be formed continuously, so that the cutting C in FIG. As indicated by S in (B), the thermosetting resin or the like constituting the surface layer will shrink to some extent, and a portion not covered by the surface layer will appear at the end of the core core material. Become. This end exposure of the core core material occurs even if the cutting C is made at one of the butting points of the core core materials.

The winding core in which the surface layer of the thermosetting resin or the like is formed on the surface of the core core material as described above may be repeatedly used as described above. However, when it is moved for transportation or position change for that purpose, its surface layer is likely to be scratched, and moreover, the end portion of the core core material is likely to be chipped. If the end of the core core material is chipped, it may not be possible to mount and fix the rotary support device that supports the winding core by the chuck.

On the other hand, this type of winding core is also used for winding a film having a magnetic recording layer, such as a raw material for a video tape or the like. During winding of the film or during storage before winding, the winding core must not be charged with electricity that causes dust adsorption. This is because if the winding core is charged and dust or the like is adsorbed, the film wound on the winding core may have irregularities or wrinkles, resulting in a defective product. Therefore, this type of winding core would be even better if antistatic measures were taken.

Further, when constructing a winding core of this type, the surface layer of the winding core must be formed into a perfect circle with a thermosetting resin or the like. In the conventional cross die, the thermosetting resin or the like is used. Each injection port of was formed so as to face the center of the cross die as shown in FIG. 9 (A). When each injection port is formed as shown in FIG. 9 (A), the thermosetting resin or the like injected from each injection port P is, as shown in FIG. 9 (B),
When the thermosetting resins and the like are solidified as they are, the adhesive force between the thermosetting resins becomes weak, and cracks may occur on the surface of the surface layer during polishing, etc. The surface layer was sometimes peeled off.

Therefore, the inventors of the present invention can easily provide a winding core which has sufficient smoothness of the surface and a measure for preventing the chipping of the end portion and which can be re-polished at low cost and easily. The present invention has been completed as a result of various studies on how to achieve the above.

[0012]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned actual circumstances and circumstances, and a winding core of this kind can be easily manufactured, and at a low cost, it is socially friendly. to provide a method for manufacturing <br/> forming a recyclable winding core is a desire, it is an object of the present invention, it is possible to ensure sufficient smoothness of the surface A winding coil that can be sufficiently re-polished, has sufficient rigidity to wind thin long materials such as films or sheets at high speed, and can prevent core core material from chipping. It is to provide a method capable of easily and surely manufacturing a.

[0013]

In order to solve the above problems, first, the means adopted by the invention according to claim 1 will be described with reference to the reference numerals used in the embodiments. A core core material 11 made of fibers, glass fibers, plastic fibers, various core materials consisting mainly of paper or cloth, or a composite having a foamed resin coating formed on the surface of the core material, and the core core material 11 The uneven surface 12 formed on the surface of, the surface layer 13 made of a thermoplastic resin coated and cured on the uneven surface 12, and formed on the end portion of the surface layer 13 so as to protrude from the end surface of the core core material 11. The winding core 10 having the protective layer 13a is manufactured through the following steps.
How to build. (A) On the surface of the core core material 11, the property of the main constituent material
Therefore, if it is formed beforehand as a sufficient uneven surface 12,
It is used as it is, and if it is not enough uneven surface 12, it is physical
Positive or negative surface 12 by mechanical or chemical grinding / polishing
Forming step; (b) a large number of core core materials 11 on which the uneven surface 12 is formed
The inner surface of the mold is a perfect circle, and the plurality of injection ports 21a are core cores.
Passes through the cross die 21 that is close to the fold line direction of the material 11.
By doing so, the entire surface of these core core materials 11
And softened thermoplastic resin from each injection port 21a
Step of injecting simultaneously and continuously adhering ; (c) The adhering thermoplastic resin is cured to form the surface layer 13.
Step that; (d) cutting the surface layer 13 in the circumferential direction by,
A winding core having a protective layer 13a at the end of the core material 11.
10 to step "der is, the means taken the invention according to 請 Motomeko 2, likewise," metal, carbon fibers, glass fibers,
Each made of plastic fiber, paper or cloth
A seed core alone or a foamed resin coating on the surface of this core
Core core material 11 composed of the formed composite, and this core core material
The uneven surface 12 formed on the surface 11 and the uneven surface 12
A surface layer 13 made of a thermoplastic resin coated and hardened on
The end surface of the core core 11 formed at the end of the surface layer 13
Winding core 10 having protective layer 13a protruding from
Is manufactured through the following steps. (A) On the surface of the core core material 11, the property of the main constituent material
Therefore, if it is formed beforehand as a sufficient uneven surface 12,
It is used as it is, and if it is not enough uneven surface 12, it is physical
Positive or negative surface 12 by mechanical or chemical grinding / polishing
Forming step; (b) a large number of core core materials 11 on which the uneven surface 12 is formed
The inner surface of the mold is a perfect circle, and the plurality of injection ports 21a are core cores.
Passes through the cross die 21 that is close to the fold line direction of the material 11.
When the core cores 11 are placed between the core cores 11,
A pair of left and right insertion parts 31 to be inserted into the holes 11a, and
Surface of each core core 11 integrated between the insertion parts 31
And an insert member having a separating portion 32 having the same surface
While interposing 30, the entire surface of these core core materials 11
The softened thermoplastic resin is applied to the body through each injection port 21a.
To the surface layer 13 by curing the (c) impregnating the thermoplastic resin; et simultaneously injected to continuously affixed step
Step that; (d) cutting the surface layer 13 in the circumferential direction by,
A winding core having a protective layer 13a at the end of the core material 11.
Step 10 " .

(Delete)

[0015] The winding core 10 which is manufacturing by the above method
In the above, since the core core material 11 and the surface layer 13 are completely integrated by the uneven surface 12, when the winding core 10 is rotated at a high speed, the core core material 11 and the surface layer 13 are separated from each other. It does not cause a troublesome phenomenon such as peeling.

The winding core 10 is composed of the core core material 1
Since the surface layer 13 made of a thermoplastic resin is integrated on the surface of No. 1, it has sufficient rigidity. Therefore, the winding core 10 has both sufficient surface smoothness necessary for winding a thin long material such as a film or sheet and sufficient rigidity to withstand high speed rotation. is there.

Furthermore, in the take-up core 10 which manufactures by the above method, since it is the surface layer 13 made of a thermoplastic resin on the surface side is formed, if the surface of the surface layer 13 Even if the surface is scratched, if the surface of the surface layer 13 is polished, the smooth surface made of the thermoplastic resin is exposed again. Of course, this surface layer 1
3 may be peeled from the core core material 11 and the surface layer 13 may be formed again to form a smooth flat surface again. Therefore, the winding core 10 can be reused by a simple recycling operation.

In the winding core 10 manufactured by the method of the present invention, as shown in FIGS. 1 and 2, protective layers 13a are formed on both ends of the surface layer 13, and this protective layer 13a is formed. The layer 13 a protrudes from the end surface of the core core material 11 and protects the end surface of the core core material 11. For example, when the winding core 10 is stood on the floor surface and stored, the protective layer 13a comes into contact with the floor surface of concrete or the like first, and as a result, the end surface of the core core material 11 becomes the floor surface. The core core material 11 is prevented from coming into direct contact with the top.
It is possible to prevent chipping of. To protect the end surface of the core core material 11 by the protective layer 13a, the end surface of the winding core 10 may hit another object during conveyance, or the core core material 11 may be attached to or removed from the chuck of the rotation supporting device. This is also sufficient for the impact that tends to occur. Of course, this protective layer 13a may be omitted.

Further, the core core material 11 of the winding core 10
Is, "Metal, carbon fiber, glass fiber, plastic fiber, various core materials mainly composed of paper or cloth,
Alternatively, it may be referred to as a "composite in which a foamed resin film is formed on the surface of this core material".

In other words, the take-up core 10 has a protection layer 13a integrally formed on the end of the surface layer 13 so that the end of the core core 11 is sufficiently protected. It is natural that the core core material 11 can be implemented by using a material having originally high rigidity such as a metal typified by boron or aluminum, and in addition, Kepler, carbon fiber, glass Not only synthetic materials such as fibers and plastic fibers, but also paper or cloth can be used.

[0021] Now, in order to produce the winding core 10 by the onset Ming, although first thing must form a core core 11, the core core 11 is formed by conventional techniques, such as opening paragraph It is only necessary to adopt the above-mentioned one, and the manufacturing method thereof is not particularly limited.
In other words, this core core material 11 is made of various core materials that are mainly composed of metal, carbon fiber, glass fiber, plastic fiber, paper or cloth, or a composite body in which a foamed resin film is formed on the surface of the core material. Any material may be used as long as it is formed. Of course, the core core material 11 constitutes the take-up core 10 which is rotated at a high speed, and it is necessary that the core core material 11 has a predetermined rigidity. .

Further, the uneven surface 12 is formed on the surface of the core core material 11. If the uneven surface 12 is formed in advance as being sufficient depending on the properties of the main constituent material, it can be used. It's good. For example, when the core core material 11 is formed by winding glass fiber as proposed in Japanese Patent Publication No. 3-8938 or Japanese Patent Publication No. 3-56896, Since the uneven surface 12 can be naturally formed on the surface of the core core material 11 by winding, the uneven surface 12 may be used as it is as it is or the uneven surface 12 may be formed by mixing the synthetic resin used. You may use it. On the other hand, when the surface of the core core material 11 is formed as a smooth surface having no unevenness due to the properties of the main constituent material, the smooth surface is ground by a tool blade, buffed, or cut with a cutting tool. The uneven surface 12 may be positively formed by performing physical grinding / polishing such as grinding with a grindstone or chemical grinding / polishing with acid.

The concavo-convex surface 12 thus formed is
It serves as a so-called anchor for the thermoplastic resin attached to the surface thereof, and the uneven surface 12 ensures the close adhesion of the thermoplastic resin. In particular, since the completed winding core 10 is for winding a film or the like while rotating at high speed around its axis, the uneven surface 12 has directionality, and the direction is the winding direction. Advantageously, it is different from the direction orthogonal to the axis of the core 10. The reason is that the wound film is
The core layer 11 is integrated with a surface layer 13 to be described later to form one inertial object, while the core core 11 is a part to which a driving force or a braking force during high-speed rotation is directly applied. 11 and the surface layer 13 between the winding core 10
A large displacement force in the radial direction may be applied. For this reason, in order to oppose this displacement force, the uneven surface 12 has directionality, and the direction is that direction.
This is because it is advantageous to be different from the direction orthogonal to the axis center of 0.

Since the core core material 11 as described above has a limited length different from the wire material, the surface of each core core material 11 is made of a thermoplastic resin or the like. In order to continuously form the layer 13, the insert member 30 described below may be used. That is, as shown in FIG. 5, when a large number of core core materials 11 supplied to the right side of the molding apparatus 20 in the drawing are fed to the cross die 21 side while keeping their axes aligned, the respective core core materials 11 are The insert member 30 is interposed between them. As shown in FIG. 4, the insert member 30 includes a pair of left and right insertion portions 31 that are inserted into the center hole 11 a of the core core material 11,
The core core material 11 exists between these insertion portions 31 and has a surface.
It is composed of a separating portion 32 that forms the same surface as the surface of.

By inserting one insert member 30 between each core core material 11 supplied on the right side of the molding apparatus 20 shown in FIG. 5, each core core material 11 has a limited length. Even if it has only one, when it enters the cross die 21, it is made continuous by the insert member 30.

In the present invention, this uneven surface 1
While passing the core core material 11 formed with 2 through the cross die 21 whose inner surface is a perfect circle, a softened thermoplastic resin is applied to the entire surface of the core core material 11 at each injection port 2
While 1a is intended to continuous manner affixed to simultaneously injected from the thereby becomes a surface layer 13 portion, for example, FIG. 3
As shown in Fig. 3, the film is formed continuously and within a short time. That is, the integration of the thermoplastic resin into the core core material 11 is completed by a single operation, and the manufacture itself of the winding core 10 is very simple.

The attachment of the thermoplastic resin is carried out by using the softened thermoplastic resin in the cross die 2 whose inner surface is a perfect circle.
Therefore, the thermoplastic resin is affixed on the surface of the core core material 11 as a completely cylindrical product, and the affixed thermoplastic resin is The core core material 1 becomes an inner surface corresponding to the shape of the uneven surface 12 formed in advance on the surface, and the core core material 1 is provided through the uneven surface 12.
It is completely integrated into 1. Of course, the attached thermoplastic resin is hardened by means such as cooling in the next step, whereby the surface layer 13 having a predetermined smoothness of the surface is completed.

Particularly, in the manufacturing method according to the present invention,
Kurosudai 21 used for this, as shown in FIG. 6 (A), the core core 1 a plurality of note input port 21a of its
It is assumed that they are substantially close to each other in the tangential direction of 1. This is done by the conventional method as shown in FIG. 9A, that is, the thermosetting resin or the like injected from each injection port P is in contact with each other at a right angle, and the heat is kept as it is. When the curable resin or the like is solidified, the adhesive force between the thermosetting resins is weakened, cracks may occur on the surface of the surface layer 13 during polishing, or the surface layer 13 may peel off in some cases. There was.

On the other hand, in the present invention, since the system as shown in FIG. 6A is adopted, the thermoplastic resin or the like individually injected from each injection port 21a is shown in FIG. 6B. As shown, they come into contact with each other over a large area and, when solidified, strongly adhere to each other. As a result, the protection of the surface layer 13 is sufficiently exerted.

The surface layer 13 formed as described above is shown in FIG.
As shown in, the cutting machine 24 of the molding apparatus 20 cuts only one position in the circumferential direction at a predetermined position on the separating portion 32 of the insert member 30. The spacing portion 32 of the insert member 30 is sufficient to mechanically detect the width thereof, and it is not necessary to accurately detect the abutting surface of each core core material 11 as in the conventional case.
The protective layer 13a required in the winding core 10 can be easily formed.

By cutting only one place in the circumferential direction on the separating portion 32 of the insert member 30, as shown in FIG. 7, the winding core 10 having the protective layers 13a at both ends of the surface layer 13 is formed.
When the insert member 30 is removed, the winding core 10 as shown in FIG. 1 is completed.

Therefore, according to the manufacturing methods of the first and second aspects, the winding core 10 having the required physical characteristics can be manufactured reliably and easily. 10 can be manufactured at low cost. Not only that, this winding core 10 has its surface layer 13
Since it can be re-ground, it can be reused and recycled, and at the same time can be delivered within a short time.

Further, in order to solve the above-mentioned problems, the means adopted by the invention according to claim 3 is the "completed surface layer" before the step (d) in the manufacturing method according to claim 1 or 2. 1
3 is formed on the surface of the surface layer 3 with a material containing a conductive material, or a conductive material such as carbon powder or metal powder is mixed into the material for the surface layer 13, so that the antistatic layer 13b is formed on the surface layer 13a. Of at least the surface. ”.

That is, according to the manufacturing method of claim 3,
As shown by the phantom line in FIG. 2, the antistatic layer 13b is intended to be formed on at least the surface of the surface layer 13 of the winding core 10. However, due to the presence of the antistatic layer 13b, the winding core is present. The surface of 10 is not charged, and dust is not adsorbed on the surface of the winding core 10. Therefore, according to the winding core 10, the smoothness of the surface layer 13 is always maintained, and the film or the like to be wound around the surface of the winding core 10 may be damaged. There is no.

As a method for forming such an antistatic layer 13b, a film is formed on the surface of the completed surface layer 13 with a material containing a conductive material, or a film for the surface layer 13 is formed. It is implemented by mixing a conductive material such as carbon powder or metal powder. In any case, this antistatic layer 13b may be formed on at least the surface of the surface layer 13 in order to prevent adsorption of dust and the like.

[0036]

FIG. 1 is a partially cutaway front view of a winding core 10 formed by a manufacturing method according to the present invention. The winding core 10 has a sufficient length. , A cylindrical shape whose surface shape is a perfect circle. In other words, the winding core 10 rotated at high speed has the same overall shape as that of a so-called rotating body, and most of the inside is removed to make it hollow, thereby achieving weight reduction. Is. As shown in FIG. 2, the winding core 10 includes a core core material 11, an uneven surface 12 formed on the surface of the core core material 11, and a thermoplastic resin coated and cured on the uneven surface 12. Surface layer 13 and this surface layer 1
3 and a protective layer 13a that is integrated with each end of the core core 3 and slightly protrudes from the end of the core core material 11.

That is, in this winding core 10,
As shown in FIGS. 1 and 2, the protective layer 13a is positively formed on both ends of the surface layer 13, and the protective layer 13a is formed.
Protrudes from the end surface of the core core material 11 to protect the end surface of the core core material 11. This protective layer 13a
When the winding core 10 is stood on the floor surface and stored, it comes into contact with the floor surface such as concrete first, and as a result, the end surface of the core core material 11 is placed on the floor surface. The direct contact is prevented and the core core material 11 is prevented from being chipped. To protect the end surface of the core core material 11 by the protective layer 13a, the end surface of the winding core 10 may hit another object during conveyance, or the core core material 11 may be attached to or removed from the chuck of the rotation supporting device. This is also sufficient for the impact that tends to occur.

The core core 11 constituting the winding core 10 is a metal, carbon fibers, glass fibers, plastic textiles, various core alone Kamia Rui in which the cloth as a main constituent material, and this It is a composite with a foamed resin or is made of metal and constitutes the main part of the winding core 10. The core core material 11 of the present embodiment is obtained by impregnating glass fiber with a resin and winding the resin in two directions with different angles, for example, and integrally forming the resin. Is formed.

Uneven surface 1 formed on the surface of the core material 11.
In the case of 2 made of glass fiber, plastic fiber, paper, cloth, etc., a predetermined uneven shape appears on the surface depending on the material, but in this case, this uneven shape is used as it is. is there. If the surface of the formed core core material 11 is smooth, the uneven surface 12 is positively formed on it. The formation of the uneven surface 12 is ground, which may be performed I by the general procedure, such as chemical grinding and polishing by a physical grinding and polishing, or acids such buffing, it is particularly limited Not a thing. In that sense, the grooves or holes front surface layer 13 may enter actively formed, which may be an uneven surface 1 2 a.

The surface layer 13 is formed by integrally affixing a softened thermoplastic resin to the surface of the core core material 11. Specifically, a molding device as shown in FIG. 3 is used. It was formed using 20. As the thermoplastic resin, PE, PP, PVC, PS, AS,
Various materials such as ABS, PC, and PA can be applied. The manufacturing method according to the present invention will be described below while describing the attachment of the thermoplastic resin by the molding device 20.

That is, in this molding apparatus 20, as shown in FIG. 5, each core core material 1 having the uneven surface 12 is formed.
While each insert member 30 is interposed between the ones, it can be conveyed toward the cross die 21 as one continuous piece. Then, one continuous piece in which the insert member 30 is interposed between the core core materials 11 is passed through the cross die 21 whose inner surface is a perfect circle, and the entire surface thereof is softened. The resin is continuously attached, whereby the portions to be the surface layer 13 and the protective layer 13a are continuously formed within a short time.
That is, the integration of the thermoplastic resin into the core core material 11 is completed by a single operation, and the manufacture itself of the winding core 10 can be greatly simplified.

Each insert member 30 is as shown in FIGS. 3 and 4, and has a pair of left and right insertion portions 31 inserted into the center hole 11a of the core core 11, and these insertion portions 31.
It is composed of a spacing portion 32 which is integrated with the space and has the same surface as the surface of each core core 11. The insert member 30 of the present embodiment is hollow in order to save material and reduce weight, and is integrated with Teflon (registered trademark), synthetic resin such as silicon, etc. as a material.

Since the thermoplastic resin is attached to the core core 11 and the insert member 30 on the separating portion 32 by using the gross die 21 having a perfect inner surface of the die, it is softened. The core core material 11
It is completely attached to the surface of the core core 11 and is completely integrated with the core core material 11 excluding the protective layer 13a at the end. Then, the attached thermoplastic resin is used as the uneven surface 12 which is previously formed on the surface of the core core 11.
The inner surface of the core core material 11 is completely integrated with the core surface 11 through the uneven surface 12. Of course,
The attached thermoplastic resin is hardened within a short time by a cooling means such as a shower 23 with a gas or a liquid in the next step, whereby the surface layer 13 having a predetermined smoothness necessary for the surface is formed. It will be completed.

In the cross die 21 embodying the present invention, as shown in FIG. 6A, the respective injection ports 21a are substantially close to each other in the tangential direction of the core core 11.
This is done as shown in FIG. 9 (A).
In the conventional method, that is, the thermoplastic resins injected from the respective injection ports P are in contact with each other at right angles, and if the thermoplastic resins are solidified as they are, the adhesive force between the thermoplastic resins becomes weak. In some cases, the surface of the surface layer 13 was cracked during polishing or the surface layer 13 was peeled off in some cases.

In this regard, in this embodiment, since the system as shown in FIG. 6A is adopted, each injection port 21a is
The thermoplastic resin and the like individually injected from
As shown in Fig. 2, they come into contact with each other over a large area, and when they are solidified, they strongly adhere to each other. With this, the protection of the surface layer 13 is sufficiently exerted.

In particular, if the surface layer 13 is formed of a synthetic resin containing carbon or metal powder as the one having the antistatic layer 13b so that at least the surface has conductivity, the winding is performed. It is possible to prevent dust from adhering to the outer peripheral surface of the core 10 due to static electricity, and it is suitable for a winding core 10 of a flexible long material such as a magnetic tape that is required to have dust resistance. Further, when the surface layer 13 is made hard, it is suitable for a flexible long material in which the outer peripheral surface of the winding core 10 is required to be smooth, and when made soft, the winding core 10 is made.
It is suitable for a flexible long material in which the elasticity of the outer peripheral surface is required, and can prevent transfer during winding, for example.

What is important here is that the surface of the hardened thermoplastic resin can be ground if necessary. In the conventional method, the thermosetting resin is coated and cured many times to form the surface layer, so the surface is not smooth, so be sure to polish it to ensure the required smoothness. Although it had to be carried out, according to the method of the present invention, since the surface of the thermoplastic resin before curing has perfect smoothness, polishing work depending on the application Is unnecessary.

To be produced by the production method of the present invention
The winding core 10 is not limited to those shown in the above-mentioned embodiments, and for example, a conductive coating layer such as a copper plating layer is formed on the outer peripheral surface of the surface layer 13 by electroless plating to form the outer periphery. If a chrome-plated layer is formed through the nickel-chrome-plated layer on the surface and this is used as the outermost layer, the outermost layer has excellent wear resistance, corrosion resistance, conductivity, and is extremely hard and highly The winding core 10 is suitable for a flexible long material such as a thin magnetic tape, which requires quality and high homogeneity. In addition, if the above-mentioned antistatic layer 13b is formed on the outer peripheral surface of the surface layer 13 or if it is coated with a conductive thermoplastic resin, the electroless plating which is complicated and requires a large number of steps can be performed. It is not necessary to form a coating layer, and the surface layer 13 is used as a conductive coating layer to form the winding core 10.
The manufacturing process of can also be greatly simplified.

[0049]

As detailed above, according to the present invention, according to this onset bright, it is possible to ensure sufficient smoothness of the surface, it is possible regrinding is enough, yet thin films or sheets long material Nodea a capable to produce winding core 10 having also a sufficient rigidity for winding at high speed is,
Easy simply than it can be produced.

[Brief description of drawings]

1 is a partial cutaway front view showing a winding core formed by engaging Ru manufacturing method according to the present invention.

FIG. 2 is a partially enlarged sectional view of the winding core shown in FIG.

FIG. 3 is a partially cutaway front view showing a state of each core member and a surface layer viewed from the center of one insert member.

FIG. 4 is a perspective view of an insert member.

FIG. 5 is a plan view of a molding apparatus that embodies the manufacturing method according to the present invention .

FIG. 6 is a cross-sectional view (A) of the core core material showing the inside of the cross die adopted by the manufacturing method of the present invention.
And formed on the core core surface by this cross die
It is a cross-sectional view of the thermoplastic resins plane (B).

FIG. 7 is a partial front view showing a winding core obtained by the manufacturing method of the present invention.

FIG. 8 is a partial front view (A) showing a state before the protective layer is cut, of the winding core obtained by the conventional manufacturing method.
And a partial front view showing the state after cutting the protective layer (B)
Is.

FIG. 9 is a cross-sectional view (A) of a core core material showing a state in a cross die used in a conventional manufacturing method, and a cross-sectional view of a thermosetting resin surface formed on the surface of the core core material by the cross die. (B).

[Explanation of symbols]

10 winding core 11 core core 11a center hole 12 uneven surface 13 Surface layer 13a protective layer 13b Antistatic layer 20 Molding equipment 21 cross die 30 Insert member 31 Insert 32 Spacer

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B65H 75/10 B65H 75/50

Claims (3)

(57) [Claims] 1. A core core material composed of a single core material mainly composed of metal, carbon fiber, glass fiber, plastic fiber, paper or cloth, or a composite body in which a foamed resin coating is formed on the surface of the core material. And an uneven surface formed on the surface of the core core material, a surface layer made of a thermoplastic resin coated and cured on the uneven surface, and the end surface of the core core material formed at the end portion of the surface layer. A method of manufacturing a winding core having a protruding protective layer through the following steps. (A) If the surface of the core core material has been previously formed as a sufficiently rough surface due to the properties of the main constituent material, use this as it is, and if it is not a sufficiently rough surface, perform physical or chemical grinding / polishing. by the steps of positively forming an uneven surface; a (b) a number of the core core material forming this uneven surface, the mold inner surface is a perfect circle, a plurality of note input port is earlier SL core core fold line by passing the click Rosudai was substantially close to the direction, the entire surface of these core core material, the step of affixing continuous manner by simultaneously injected a thermoplastic resin softened from each injection port; ( c) a step of curing the attached thermoplastic resin to form a surface layer; (d) cutting the surface layer in the circumferential direction to obtain a winding core having a protective layer at the end of the core core material. Process. 2. Metal, carbon fiber, glass fiber, plastic
Various cores mainly made of stick fiber, paper or cloth
Form a foamed resin coating on the surface of the core material or the core material
On the surface of the core core made of the composite
The formed uneven surface and the heat
A surface layer made of plastic resin and formed on the edge of this surface layer.
And a protective layer protruding from the end surface of the core core material.
A method for manufacturing a wound core having the following steps. (A) The properties of the main constituent material on the surface of the core material
Therefore, if it is previously formed as a sufficiently uneven surface,
Use it as it is, and if it is not a sufficiently uneven surface, physically or
Actively forming uneven surface by chemical grinding and polishing
Step; (b) A large number of the core core materials having the uneven surface are formed into a mold.
The inner surface is a perfect circle, and multiple injection ports are the broken lines of the core core material.
When passing through a cross die that is close to the direction,
A Between the core materials, left and right inserted in the center hole of the core material
A pair of insertion parts and an integrated part between these insertion parts
(A) An inserter consisting of the surface of the core material and a separation part having the same surface
The entire surface of these core cores is
The softened thermoplastic resin is applied to the body through the injection ports.
Step of injecting at the same time and continuously adhering ; (c) a step of curing the impregnated thermoplastic resin to form a surface layer
Extent; (d) by cutting the surface layer in the circumferential direction, wherein
Process for forming a winding core with a protective layer at the end of the core material
Degree. 3. Before the step (d), a film is formed on the surface of the completed surface layer with a material containing a conductive material, or carbon powder or metal powder is included in the material for the surface layer. The method for producing a winding core according to claim 1 , wherein the antistatic layer is formed on at least the surface of the surface layer by mixing a conductive material such as.