KR20220059273A - Core unit for film winding - Google Patents

Abstract

Disclosed is a core unit for film winding having an improved shape so that wrinkles do not occur on the film to be wound and good-quality winding can be made. The disclosed core unit for film winding comprises: a core body made in the form of a straight round pipe and made of a paper pipe or a synthetic resin pipe; and a tension absorbing pad attached and installed to be wound around an outer circumferential surface of the core body and configured in the form of a circular pipe, the film being wound on the outer circumferential surface, and absorbing the tension acting on the film to prevent wrinkling of the film.

Description

Core unit for film winding

The present invention relates to a core unit for film winding, and more particularly, by absorbing excessive tension applied to the film during winding of an ultra-thin film such as a battery separator film, wrinkling is prevented in the film to be wound, so that good-quality winding can be achieved. It relates to a core unit for film winding.

In general, various types of films are used in various industrial fields, and these films are usually wound on a core and handled in the form of a film-roll.

When manufacturing a film, film-roll products are produced by winding the manufactured film on a core to facilitate transport and handling of the manufactured film. It is also wound on a core to produce a processed film-roll.

The conventional film winding core consists of a paper tube simply made of paper, an FRP tube made of a FRP (fiber-reinforced plastic) material, an ABS tube made of an ABS resin (acrylonitrile butadiene styrene copolymer) material, etc. The film is wound while being rotated in a fixed state.

However, when winding a film with an existing film winding core, the core rotates at an excessive speed due to malfunction than the design speed, or during film processing, the rotational speed of the core at which the processed film is wound compared to the unwinding rotational speed of the raw film roll. When is high, excessive tension is generated in the film wound on the core and wrinkles occur in the film. Wrinkles were transferred to the film wound on the core later due to the wrinkled creases, resulting in a defect in the entire film-roll, and in the worst case, the product had to be discarded.

As such, the phenomenon of wrinkles in the film wound on the core was more severe in the case of an ultra-thin film of 4 micrometers or less, such as a battery separator film. That is, when a very thin ultra-thin film is wound on a core, even if a tension slightly higher than the set tension occurs, wrinkles occur more easily as it is stretched in the longitudinal direction. there was.

Republic of Korea Patent Registration No. 10-1518533 Republic of Korea Patent Registration No. 10-2155215 Republic of Korea Patent Publication No. 10-2020-0005545 Republic of Korea Patent Publication No. 10-2016-0141710 Republic of Korea Patent Publication No. 10-2016-0100763

The present invention has been devised to solve the problems of the prior art as described above, and has an improved form that absorbs excessive tension acting on the film during winding of the film, so that wrinkles do not occur in the film to be wound and good quality winding can be achieved. An object of the present invention is to provide a core unit for winding a film having.

However, the object of the present invention is not limited thereto, and even if not explicitly mentioned, the object or effect that can be grasped from the solution or embodiment of the problem is also included therein.

The core unit for film winding of the present invention for achieving the above object is made in the form of a straight circular pipe, the core body consisting of a paper pipe or a synthetic resin pipe; It is attached and installed so as to be wound around the outer circumferential surface of the core body and is configured in the form of a circular pipe, and the film is wound on the outer circumferential surface, and a tension absorbing pad that absorbs the tension acting on the film to prevent wrinkling of the film; characterized in that it comprises a do it with

The tension-absorbing pad may be made of a soft synthetic resin foam having cushioning properties.

The soft synthetic resin foam having the cushioning property may be made of a PE material.

A double-sided adhesive film interposed between the tension-absorbing pad and the core body to allow the tension-absorbing pad to adhere to the core body; may be configured to further include.

According to the above, in the present invention, a tension absorbing pad made of foam is configured on the outer peripheral surface of the core body, and a certain amount of tension acting on the film is absorbed through the tension absorbing pad by winding the film on the tension absorbing pad to relieve tension. The film is wound while wrinkling through the film, and good winding is made without the phenomenon of wrinkle transfer occurring, thereby producing a film-roll with excellent smoothness.

In particular, the core unit for film winding of the present invention is more effective to facilitate winding without transfer of wrinkles when winding an ultra-thin film with a thickness of several micrometers like a battery separator film.

In addition, the present invention is a structure in which the tension absorbing pad is attached to the core body in an adhesive form, and after being used for film processing or film production, the tension absorbing pad is removed from the core body and the core body is recycled to save resources according to resource reuse. , environmental conservation, and product economical improvement.

1 is a perspective view showing a core unit for winding a film according to an embodiment of the present invention;
2 is a cross-sectional view of a core unit for winding a film according to an embodiment of the present invention;
FIG. 3 is an enlarged cross-sectional view of a main part showing an enlarged portion A of FIG. 2 .

The above objects, other objects, features and advantages of the present invention will be easily understood through the following preferred embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In this specification, when a component is referred to as being on another component, it means that it may be directly formed on the other component or a third component may be interposed therebetween. In addition, in the drawings, the thickness of the components is exaggerated for effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional and/or plan views, which are ideal illustrative views of the present invention. In the drawings, thicknesses of films and regions are exaggerated for effective description of technical content. Accordingly, the shape of the illustrative drawing may be modified due to manufacturing technology and/or tolerance. Accordingly, embodiments of the present invention are not limited to the specific form shown, but also include changes in the form generated according to the manufacturing process. For example, the etched region shown at a right angle may be rounded or have a predetermined curvature. Accordingly, the regions illustrated in the drawings have properties, and the shapes of the regions illustrated in the drawings are intended to illustrate specific shapes of regions of the device and not to limit the scope of the invention. In various embodiments of the present specification, terms such as first, second, etc. are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another. The embodiments described and illustrated herein also include complementary embodiments thereof.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, the terms 'comprises' and/or 'comprising' do not exclude the presence or addition of one or more other components.

In describing the specific embodiments below, various specific contents have been prepared to more specifically describe the invention and help understanding. However, a reader having enough knowledge in this field to understand the present invention may recognize that it may be used without these various specific details. In some cases, it is mentioned in advance that in describing the invention, parts that are commonly known and not largely related to the invention are not described in order to avoid confusion for no reason in explaining the invention.

The core unit 10 for film winding of the present invention is used for manufacturing a film-roll by winding a film, and a core body 11 and a tension absorbing pad 13 attached to the outer circumferential surface of the core body 11 ) is configured to include

The core body 11 is a paper tube made of paper like a normal film winding core, an FRP tube made of a FRP (Fiber-reinforced plastic) material, and an ABS tube made of an ABS resin (acrylonitrile butadiene styrene copolymer) material. Of course, it can also be made of FRP pipe, ABS pipe, and other various synthetic resin round pipes.

The tension absorbing pad 13 is made of a soft synthetic resin foam having cushioning properties, is attached to be wound around the outer circumferential surface of the core body 11, and has a circular tubular shape surrounding the outer circumferential surface of the core body 11 .

At this time, the length of the core body 11 is configured to be longer than the length of the tension absorbing pad 13 , so that both ends of the core body 11 protrude outward from both ends of the tension absorbing pad 13 and are exposed to the outside. It can be configured to be

In the present invention, the tension absorbing pad 13 is made of a sheet-shaped PE foam (Polyethylene foam). Here, PE, that is, polyethylene (Polyethylene) is a polyolefin made by polymerizing an ethylene monomer.

In the present invention, the soft synthetic resin foam made of PE material is an electron beam crosslinked foam, and it has good surface smoothness through the irradiation process using an electron beam. there is.

In this embodiment, the PE foam may be molded to adjust physical properties such as elasticity according to the requirements of the customer without applying the normal mass-produced PE foam.

In addition, in the present invention, the tension absorbing pad 13 may have a width of 500 to 2000 mm, and a thickness of 0.2 to 8 mm. In addition, the color may be configured to have a predetermined color such as white or black.

In this embodiment, when the thickness of the tension absorbing pad 13 is made in the range of 0.2 to 8 mm is less than 0.2 mm, the absorption of the tension acting on the film (f) is too weak, so depending on the winding of the film (f). When wrinkles are generated and configured to exceed 8 mm, the absorbency of the acting tension of the film (f) is excessively increased, and the outer peripheral surface side of the tension-absorbing pad 13 is excessively compressed while a shape deformation occurs and tension absorption occurs. There may be a problem in that the outer peripheral surface of the pad 13 is separated from the other side of the wound film f. That is, when the thickness of the tension absorbing pad 13 is in the range of 0.2 to 8 mm, the film (f) wound while winding is made without wrinkling of the film (f) through absorption of the tension applied to the film (f). While preventing the partial separation from the tension absorbing pad 13, a stable and good film f can be wound.

On the other hand, the tension-absorbing pad 13 of the present invention is not limited to PE foam, and if it is a soft synthetic resin foam having cushioning properties, it may be made of other synthetic resin foams such as polyurethane foam.

In the present invention, the thickness of the tension absorbing pad (also, the tension absorbing pad 13) may be in the range of 2 mm to 400 mm depending on the design of the shaft rotational force of the film winding device.

The present invention has a structure in which the tension absorbing pad 13 is attached to the outer peripheral surface of the core body 11, and the film f is wound on the outer peripheral surface of the tension absorbing pad 13. In this case, when the film (f) is wound, the tension absorbing pad 13 absorbs and attenuates the tension acting on the film (f), thereby preventing the film (f) from being stretched while preventing the film (f) from being wrinkled. be able to do

That is, in the prior art, the core is fixedly mounted on the shaft of the winding device and the film is wound on the core as the core rotates with the rotation of the shaft. Tension is generated, and when excessive tension is generated in the film, wrinkles are generated as the film is stretched, and the film is wound in a wrinkled state. and the tension acting on the film (f) is absorbed by the tension-absorbing pad 13 made of synthetic resin foam having cushioning properties, so that the tension is attenuated and thus the film (f) is wound in a flat state without wrinkles By doing so, good quality winding with good smoothness is achieved, and high-quality film-roll production is possible.

On the other hand, referring to FIG. 3 , in the present invention, when the tension absorbing pad 13 is attached to the outer circumferential surface of the core body 11 , it is not a method of bonding with an adhesive, but is adhered through a double-sided adhesive film 15 . It may be configured such that it is possible to reuse the core body 11 by separating the tension absorbing pad 13 from the core body 11 after use.

The present invention is configured to attach the tension absorbing pad 13 and the core body 11 in an adhesive manner using a double-sided adhesive film 15 having adhesive layers 15a on both sides thereof, and in this embodiment, double-sided adhesive The film 15 is made of a PET (polyethylene terephthalate) film material, and may have a form in which adhesive layers 15a are formed on both sides, respectively.

One side of the adhesive layer 15a of the double-sided adhesive film 15 is adhered to the outer circumferential surface of the core body 11, and the other side adhesive layer 15a is adhered to the inner circumferential surface of the tension absorbing pad 13. Core body 11 And it may be configured to be attached to the tension absorbing pad (13). Accordingly, the used core unit 10 can be reused for manufacturing a new core unit after the tension absorbing pad 13 is removed from the core body 11 .

In addition, when the tension absorbing pad 13 is attached to the outer circumferential surface of the core body 11 using the double-sided adhesive film 15, both end portions 13a of the tension absorbing pad 13 are in close contact with each other so that the joint gap It is configured to prevent a decrease in the smoothness of the wound film (f) when the film (f) is wound by attaching and installing it without a gap. In this case, the second double-sided adhesive film for attaching the both end portions 13a of the tension-absorbing pad 13 to each other in an adhesive manner may be further configured.

In the above, the present invention has been shown and described in connection with preferred embodiments for illustrating the principles of the present invention, but the present invention is not limited to the configuration and operation as shown and described as such. Rather, it will be apparent to those skilled in the art that many changes and modifications can be made to the present invention without departing from the spirit and scope of the appended claims. Accordingly, all such suitable alterations and modifications and equivalents are to be considered as falling within the scope of the present invention.

10...Core unit for film winding
11...Core body
13...Tension Absorption Pad
15...Adhesive film on both sides

Claims (4)

It is made in the form of a straight round pipe, and the core body is made of a branch pipe or a synthetic resin pipe;
It is attached and installed so as to be wound around the outer circumferential surface of the core body and is configured in the form of a circular pipe, and the film is wound on the outer circumferential surface, and a tension absorbing pad that absorbs the tension acting on the film and prevents the wrinkle of the film. A core unit for film winding.
The method of claim 1,
The tension-absorbing pad is a core unit for film winding, characterized in that it is made of a soft synthetic resin foam having cushioning properties.
3. The method of claim 2,
The core unit for film winding, characterized in that the soft synthetic resin foam having the cushioning property is made of PE material.
The method of claim 1,
The core unit for film winding further comprising a; a double-sided adhesive film interposed between the tension-absorbing pad and the core body to make the tension-absorbing pad adhere to the core body.

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