KR101512144B1 - Core for rolling film - Google Patents

Abstract

The present invention discloses a film winding core having a structure that is easily separated from a film even when the film is wound on the outer circumferential surface. The film winding core according to the present invention includes a tube having a cylindrical shape and formed with an inner space defined by an outer wall and an inner wall and having a fluid injection port for injecting fluid into the inner space .

Description

Core for rolling film}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a core that can wind a film, and more particularly, to a core for winding a film which can be easily separated from a film because its diameter can be adjusted.

The film is formed in the form of a thin, long film. Such a film may include various kinds such as a copper foil, a PET film, and a separator for a battery, depending on the material and the form thereof.

Due to its morphological characteristics, such a film is generally in a wound state or wound state in the manufacturing or storage stage. At this time, a film winding core is used so that the winding state can be kept constant while facilitating winding and use of the film. Such a film winding core forms a central axis in a state in which the film is wound by winding the film around the outer circumferential surface. To this end, the film winding core is typically embodied in a cylindrical form.

However, in some cases, in order to reuse the core or the like, it is necessary to separate only the core portion in a state in which the film is wound. Particularly, in the development and operation sites, core is often reused. However, according to a conventional film winding core formed in a cylindrical shape, the diameter of the core is fixed, for example, 3 inches or 6 inches, or the like. Since the film is wound in close contact with the outer peripheral surface of the core, it is very difficult to separate the core from the film while the core is wound.

Therefore, when the core is to be reused in a state in which the film is wound around the outer circumferential surface of the core, it is inevitable to use a method of loosening or cutting out the film. However, in the case of a film, the length is very long, such as a length usually ranging from several tens of meters to several hundreds of meters. Therefore, it takes a lot of effort and time to unwind or cut the film, and it is difficult to reuse the film.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a film winding core having a structure that can be easily separated from a film even when the film is wound on the outer circumferential surface.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

In order to accomplish the above object, a film winding core according to the present invention is formed in a cylinder shape, and has an inner space defined by an outer wall and an inner wall to form a sealed inner space, And a tube provided with an injection port.

Preferably, the apparatus further includes a center layer provided on the inner side of the inner wall to support the inner wall.

Also preferably, the apparatus further comprises an outer layer formed in a tubular shape and provided on the outer side of the outer wall.

Also, preferably, the internal space increases in volume due to the inflow of the fluid.

Also, preferably, the inner space is formed more than once.

According to the present invention, the diameter of the film winding core can be adjusted.

Therefore, even when the film is wound on the outer circumferential surface, the core can be easily separated and the core recycling rate can be increased. Further, it is not necessary to loosen or cut out all of the wound-up film to reuse the core, so that the time and effort for reusing the core can be reduced and the waste of the film can be prevented.

In addition, according to another aspect of the present invention, even if the film is not in close contact with the outer circumferential surface of the core and is somewhat spaced to loosen the wound state, the winding state of the film can be made harder have.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to further the understanding of the technical idea of the invention, And should not be construed as limiting.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a transparent perspective view schematically showing the construction of a film winding core according to an embodiment of the present invention; FIG.
2 is a transparent perspective view schematically showing a structure of a film winding core according to another embodiment of the present invention.
Fig. 3 is a perspective view schematically showing a configuration in which a film is wound around the film winding core of Fig. 2; Fig.
Fig. 4 is a side view of Fig. 3; Fig.
Fig. 5 is a perspective view schematically showing the structure in which the fluid injected into the inner space of the tube is discharged to the outside in Fig. 3; Fig.
Fig. 6 is a side view of Fig. 5. Fig.
Figs. 7 and 8 are perspective views schematically showing a structure of a film winding core according to still another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a transparent perspective view schematically showing the construction of a film winding core according to an embodiment of the present invention; FIG.

Referring to FIG. 1, the film winding core is formed in a cylindrical shape such as a cylinder, and winds the film on the outer peripheral surface. That is, the film is wound in close contact with the outer surface of the film winding core, so that the film winding core forms the central axis of the wound film. Here, the term film refers to an object having a thin and long thin film shape. The film may have various kinds depending on materials, functions, structures, etc. such as a metal thin plate, a polymer film, a separator, paper, .

The film winding core according to the present invention comprises a tube (100).

The tube 100 has the same shape as a cylindrical tube and has an outer wall 110 and an inner wall 120 and forms an inner space by the inner wall 120 and the outer wall 110. In this case, the inner wall 120 refers to a portion of the tube 100 that forms an inner circumferential surface, that is, a wall surface close to the central axis of the cylinder, and the outer wall 110 defines a portion forming the outer circumferential surface of the tube 100, It means a wall far from the axis.

The inner space formed by the inner wall 120 and the outer wall 110 may be configured to be in a sealable state. Accordingly, the inner space of the tube 100 can be filled with a fluid such as gas or liquid. Preferably, air is injected into the inner space of the tube 100. Air is lighter in weight than liquid and has many advantages such as being easily available. However, it goes without saying that various gases or liquids may be injected into the inner space of the tube 100 in addition to the air.

In addition, the tube 100 may include a fluid inlet 130. The fluid inlet 130 is a hole through which fluid can be injected into the inner space of the tube 100. 1, the fluid inlet 130 may be formed at an end portion of the tube 100, that is, at a side surface thereof, or may be formed at an outer wall 110 or an inner wall 120. According to the present invention, a fluid such as air can be injected into the inner space of the tube 100 through the fluid injection port 130. Conversely, fluid such as air filled in the inner space of the tube 100 may be discharged through the fluid inlet 130.

The fluid injection port 130 is not necessarily provided in the tube 100 but may be provided in two or more. When two or more fluid injection ports 130 are provided, the fluid can be injected or discharged through the plurality of fluid injection ports 130, so that the fluid can be easily and quickly introduced into the internal space of the tube 100 Lt; / RTI >

Also, preferably, the inner space of the tube 100 may be changed in volume by the inflow and outflow of a fluid such as air. That is, when air is injected through the fluid injection port 130, the internal space of the tube 100 may be increased in volume. Conversely, when the air is discharged through the fluid inlet 130, the internal space of the tube 100 can be reduced in volume.

Such a change in volume with respect to the internal space of the tube 100 can change the diameter of the entire film winding core, indicated by d in Fig. That is, when the air is injected into the inner space, the volume of the inner space increases and the diameter d increases. When the air in the inner space is discharged to the outside, the volume of the inner space decreases and d may decrease.

Since the volume of the inner space of the tube 100 may change due to the inflow and outflow of the fluid through the fluid injection port 130, the outer wall 110 and the inner wall of the tube 100 may have different sizes, (120) may be made of a suitable material. The inner wall 120, the outer wall 110, or both the inner wall 120 and the outer wall 110 of the tube 100 may be made of a rubber material. When the inner wall 120 and / or the outer wall 110 of the tube 100 are made of a rubber material, the volume of the inner space can be flexibly changed according to the filling amount of the fluid with respect to the inner space. However, the present invention is not necessarily limited to these embodiments, and the inner wall 120 and the outer wall 110 of the tube 100 may be formed of various other materials. For example, the outer wall 110 of the tube 100 may be made of a flexible material such as rubber, and the inner wall 120 of the tube 100 may be made of a hard material such as plastic.

Preferably, the tube 100 may include a cover 140, as shown in FIG. The lid 140 is provided in the fluid inlet 130 to enable opening and closing of the fluid inlet 130. That is, when the lid 140 is covered with the fluid inlet 130, the inner space of the tube 100 can be maintained in a closed state. When the lid 140 is pulled out from the fluid inlet 130, the inner space of the tube 100 is released from the sealed state, and fluid can be flowed in and out through the fluid inlet 130. If a plurality of fluid injection ports 130 are provided in the tube 100, the lid 140 may also be provided for each fluid injection port 130.

Preferably, the film winding core according to the present invention may further include a center layer 200, as shown in Fig.

The center layer 200 has a smaller diameter than the tube 100 and is provided inside the inner wall 120 of the tube 100 to support the inner wall 120 of the tube 100. To this end, the outer peripheral surface of the center layer 200 is preferably in close contact with the inner wall 120 of the tube 100. Since the center layer 200 is provided inside the tube 100 to impart mechanical strength to the tube 100, it is preferable that the center layer 200 is made of a rigid material having a higher strength than the tube 100. For example, the center layer 200 may be made of a polymer material such as a metal material or a plastic material. However, the center layer 200 of the present invention is not limited to a specific material. As a more specific example, when the tube 100 is made of rubber, the center layer 200 may be made of iron or aluminum. In this case, the center layer 200 supports the tube 100 inside the tube 100 and can maintain its shape in a cylindrical shape.

More preferably, an adhesive layer may be further included between the center layer 200 and the inner wall 120. This adhesive layer allows the center layer 200 and the inner wall 120 to be adhered and fixed so that the tube 100 is separated from the inner wall 120 and the supporting force of the center layer 200 is not properly transmitted to the tube 100 Can be prevented.

In FIG. 1, the center layer 200 is shown as an empty cylindrical tube. However, the center layer 200 may have various other shapes. For example, the center layer 200 may be constructed in the form of a cylindrical rod, the hollow of which is not hollow.

2 is a transparent perspective view schematically showing a structure of a film winding core according to another embodiment of the present invention. In FIG. 2, parts that are similar to those of FIG. 1 and can be equally applied are not described in detail, and differences from FIG. 1 will be mainly described.

Referring to FIG. 2, the film winding core according to the present invention may further include an outer layer 300.

The outer layer 300 is formed in the shape of a cylindrical tube having a larger diameter than the tube 100 and is provided outside the outer wall 110 of the tube 100. Since the tube 100 may increase or decrease its volume through the filling of the fluid with respect to the inner space and the diameter of the core must change through the volume change of the tube 100, It is preferable to be made of a flexible material so that the diameter can be changed according to the volume change of the battery 100. For example, the outer layer 300 may be made of teflon. However, the present invention is not limited to such a material, and various materials may be employed for the outer layer 300.

The outer layer 300 may be in a state of being in close contact with the outer side of the outer wall 110 of the tube 100 since the outer layer 300 should be able to change its diameter according to the volume change of the tube 100.

According to the embodiment in which the outer layer 300 is provided outside the tube 100, even if the fluid filling amount with respect to the inner space of the tube 100 changes, the cylindrical shape of the core remains unchanged It is advantageous. In addition, the outer layer (300) can protect the outer wall (110) of the tube (100) from external impact.

More preferably, an adhesive layer may be further included between the outer layer 300 and the outer wall 110 of the tube 100. According to this embodiment, since the outer layer 300 and the tube 100 can be fixed, the movement of the outer layer 300 in the inward and outward directions due to the volume change of the tube 100 can be reliably achieved. For example, when the volume of the tube 100 is reduced, the outer layer 300 may move in the inner direction of the core, i.e., the central axis direction, and the diameter of the core may be reduced. Conversely, when the volume of the tube 100 increases, the outer layer 300 moves in the direction opposite to the outer direction of the core, i.e., the central axis direction, so that the diameter of the core can be increased.

Fig. 3 is a perspective view schematically showing a configuration in which the film 10 is wound around the film winding core of Fig. 2, and Fig. 4 is a side view of Fig.

3 and 4, the film winding core further includes a tube 100, a center layer 200, and an outer layer 300. An inner space is formed in the tube 100, and the inner space is filled with a fluid. The film 10 is wound on the outer circumferential surface of the outermost layer 300 of the core, and the film 10 and the outer layer 300 are in close contact with each other. In this way, when the film 10 and the outer layer 300 are in close contact with each other, the film 10 can be prevented from being loosened and the winding state can be stably maintained.

According to the present invention, in order to separate the film winding core from the film 10 in this state, the fluid filled in the inner space of the tube 100 is first discharged through the fluid injection port 130.

FIG. 5 is a perspective view schematically showing the structure in which the fluid injected into the inner space of the tube 100 is discharged to the outside in FIG. 3, and FIG. 6 is a side view of FIG.

5 and 6, when at least a part of the fluid injected into the inner space of the tube 100 is discharged to the outside through the fluid injection port 130, the inner space volume of the tube 100 may be reduced . This causes the total diameter of the film winding core to be reduced, so that the film 10 and the core are spaced a predetermined distance, so that an empty space as shown by e in FIGS. 5 and 6 is formed. Therefore, even when the film 10 is wound, the core can be easily removed from the film 10.

Further, according to the film winding core structure of the present invention, when the wound state of the film 10 relative to the core is loosened, the wound state can be ensured through the adjustment of the diameter of the core. For example, as shown in FIGS. 5 and 6, when the winding of the film 10 is loosened by a predetermined distance between the core and the film 10, air is injected into the inner space of the tube 100 So that the diameter of the core can be increased. Then, since the film 10 is in close contact with the outer circumferential surface of the core, the film 10 can be wound more firmly on the core.

On the other hand, the construction of the film winding core shown in Figs. 1 to 6 is merely an embodiment, and in addition, the film winding core can be embodied in various embodiments.

For example, although only one internal space of the tube 100 is formed in the film winding core in FIGS. 1 and 2, more than two internal spaces may be formed. This will be described in more detail with reference to FIGS. 7 and 8. FIG.

Figs. 7 and 8 are perspective views schematically showing a structure of a film winding core according to still another embodiment of the present invention.

Referring to FIGS. 7 and 8, the film winding core according to the present invention may have two or more internal spaces formed in the tube 100.

At this time, as shown in FIG. 7, the tube 100 may have one inner wall 120 and one outer wall 110 connected to each other without being physically separated, thereby forming an inner space therebetween. The inner space may include a partition 150 between the outer wall 110 and the inner wall 120 so that the inner space of the tube 100 may be divided into a plurality of inner spaces by the partition 150 .

Or the tube 100 may have a plurality of physically separated outer walls 110 having one inner wall 120 that is not physically separated as shown in FIG. In this case, a plurality of inner spaces may be formed in the tube 100 through separation of the outer wall 110.

When the tube 100 is provided with a plurality of internal spaces, the fluid inlet 130 may be provided separately for each internal space.

7 and 8, three internal spaces are provided in the tube 100. However, the number of divided internal spaces may be variously embodied.

7 and 8, it is shown that the core layer 200 and the outer layer 300 do not exist in the film winding core for convenience of explanation. However, in this configuration, the core layer 200 ) And an outer layer 300 may be included.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: tube
110: outer wall
120: inner wall
130: Fluid inlet
140: cover
200: center layer
300: outer layer

Claims (12)

A core for winding a film,
A tube having a cylindrical shape and having an inner space defined by an outer wall and an inner wall to provide a closed inner space and having a fluid inlet for allowing fluid to be injected into the inner space,
A center layer provided inside the inner wall to support the inner wall; And
Further comprising an adhesive layer between the inner wall and the center layer,
A plurality of inner spaces are formed by a plurality of outer walls physically separated from or not connected to the partition wall between the outer wall and the inner wall,
Wherein the fluid injection port is separately provided for each of the inner spaces. delete delete The method according to claim 1,
Further comprising an outer layer formed in a tube shape and provided on the outer side of the outer wall. 5. The method of claim 4,
Wherein the outer layer is made of a Teflon material. 5. The method of claim 4,
Further comprising an adhesive layer between the outer wall and the outer layer. The method according to claim 1,
Wherein at least one of the outer wall and the inner wall is made of a rubber material. The method according to claim 1,
Wherein said inner space is bulged by the inflow of fluid. delete The method according to claim 1,
And air is injected into the inner space. The method according to claim 1,
Wherein the tube is provided with a cover so that the fluid injection port can be opened and closed. delete

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