KR101816830B1 - Film winding core using fine etching for preventing stepwise and preparing method for thereof - Google Patents

Abstract

The present invention relates to a film winding core for preventing steps from being formed by precision etching, comprising: a cylindrical core; and a carbon coating layer formed on an outer circumferential surface of the core, wherein an etching groove is formed in the carbon coating layer through laser processing on one side of the outer circumferential surface. Thus, the winding core corresponds to thickness of various kinds of films, and initial loss of the film can be prevented by suppressing pressing and wrinkling of the film since a part of the film is not protruded by preventing steps when the winding core is wound to the film.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a film winding core for preventing stepped steps through precision etching and a manufacturing method thereof,

The present invention relates to a film winding core capable of winding a film by preventing a step due to the thickness of the film when the film is wound.

In the case of a winding core for winding and storing or moving the film, a step is inevitably generated by the thickness of the film itself and the thickness of the adhesive layer such as a double-sided tape for fixing the winding core.

1 is a cross-sectional view showing a state in which a film is wound around a winding core according to a conventional technique.

Referring to FIG. 1, the step is such that when the number of times of winding of the film is small, the wound film is gradually inclined and does not protrude outwardly. However, when the wound film is increased, There is a problem that the crease layer 1 sloped abruptly due to the step difference is formed while the pressure is increased, so that the crease layer 1 is severely protruded to the outer circumferential surface.

Such a step difference leads to a more serious loss in the case of a high-performance optical film, so that development of a winding core capable of winding a film by preventing a step difference has been continued.

 Korean Patent Laid-Open Publication No. 2016-0015453 (2016.02.15) discloses a tube for winding an optical film, which tube is formed on an outer circumference of the tube and on the outer periphery of the tube, An inner groove for allowing an end portion of the optical film to be inserted therein is recessed at a relatively lower depth than an inner groove at one side of the inner groove at the time of the first winding of the optical film, and an adhesive member is formed on the upper surface, And a fixing groove for fixing one end of the optical film to be formed on the optical film for optical film. In this patent, however, In addition, the efficiency of the process is decreased due to the additional processing required. In particular, when the width of the film is varied in various ways, , It is difficult to form the binding material problems.

1. Korean Patent Publication No. 2016-0015453 (2016.02.15)

Accordingly, it is an object of the present invention to provide a film winding core for preventing step difference by precise etching that can prevent a step and take up a film, and a method for manufacturing the same.

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be understood by those skilled in the art from the following description.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a cylindrical core; And a carbon coating layer formed on an outer circumferential surface of the core, wherein an etch groove is formed on one side of the outer circumferential surface of the carbon coating layer by laser processing.

The cylindrical core may be formed of fiber reinforced plastics (FRP).

Further, the cylindrical core can be subjected to antistatic processing on the surface.

The carbon coating layer may be formed to a thickness of 200 to 400 탆.

The etching groove may be formed by etching the carbon layer by irradiating the carbon coating layer with a laser.

The etch groove is etched to increase the depth from one end of the etch groove to the other end to form a slope, and a step is formed on a part of the slope so that the start end of the film can be attached and fixed.

The step formed on a part of the inclined surface may form a space in which the adhesive tape is disposed.

The etching grooves are formed adjacent to each other and can face each other.

The etch groove may be formed so as to be deeper toward the remainder of the etch groove, and the starting end of the film may be attached to one of the etch grooves to wind the film in both directions.

The surface of the carbon coating layer may be antistatic.

According to another aspect of the present invention, there is provided a method of manufacturing a cylindrical core, comprising the steps of: (1) preparing a cylindrical core; Coating a carbon coating layer on the cylindrical core (second step); Determining a shape of an etch groove formed in the carbon coating layer (a third step); And forming an etch groove by irradiating the carbon coating layer with a laser (fourth step). The present invention also provides a method for manufacturing a stepped anti-film film winding core by precision etching.

Further, the cylindrical core is formed of a fiber-reinforced plastic and can be surface-polished after the antistatic processing on the surface.

Also, the carbon coating layer may be formed to a thickness of 200 탆 to 400 탆.

Also, in the third step, the shape of the etching groove may be an etch groove according to the image by inputting an image to the laser etching apparatus using a laser etching apparatus.

Also, in the step of forming the etching grooves, the etching grooves are etched to increase the depth from one end to the other end to form a slope, and a step may be formed on a part of the slope to form a space in which the adhesive tape is disposed.

Further, the etch groove may be determined by a thickness of a cross section of the film to be wound and a thickness of the adhesive layer formed on the inner surface of the etch groove, and may be etched by the laser.

According to the present invention, the thickness of the various films is corresponding to the thickness of the film, but the step is prevented when the film is wound, so that a part of the film does not protrude, thereby preventing the pressing and wrinkling of the film.

In particular, in the case of a high-performance optical film used in an optical material manufacturing process, although the thickness and width of the film are variously determined, it is difficult to produce the winding core. However, It is possible to efficiently produce a step-preventing film winding core capable of coping with various films by using plastic as a tubular body.

Further, the thickness of the carbon coating layer is determined in advance, and the depth of the etching groove is determined in consideration of the thickness of the film and the thickness of the adhesive layer adhered to the etching groove, There is no additional finishing step such as grinding the etched grooves, so that the efficiency of the winding core manufacturing process can be greatly increased.

In the case where the starting end of the film is attached and fixed to the deep side of the etching groove formed on the surface of the winding core and is formed by two etching grooves, So that the work efficiency of the operator is greatly increased in the initial winding work.

1 is a cross-sectional view showing a film projecting portion of a conventional film winding core.
2 is a perspective view and a cross-sectional view of a stepped anti-roll film winding core according to an embodiment of the present invention.
3 is a perspective view and a cross-sectional view of a stepped anti-roll film winding core according to another embodiment of the present invention.
4 is a perspective view and a cross-sectional view of a step-preventing film winding core through precision etching capable of bidirectional winding according to another embodiment of the present invention.
FIG. 5 is a cross-sectional view showing that the starting end of the film is wound around the etching hole in the stepped anti-roll film winding core according to the embodiment of the present invention.
FIG. 6 is a cross-sectional view showing that the starting end of a film is wound around an etching hole in a film winding core for anti-step prevention by precision etching according to another embodiment of the present invention.
FIG. 7 is a cross-sectional view showing that the starting end of the film is wound on the etching hole in the step-preventing film winding core through precision etching capable of bidirectional winding according to another embodiment of the present invention.
FIG. 8 is a flow chart of a method of manufacturing a film winding core for preventing stepped steps by precision etching according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving it will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 2 is a perspective view and a cross-sectional view of a step-up prevention film winding core through precision etching according to an embodiment of the present invention, FIG. 3 is a perspective view and a sectional view of a stepped anti-film winding core according to another embodiment of the present invention And FIG. 4 is a perspective view and a cross-sectional view of a stepped anti-roll film winding core according to another embodiment of the present invention.

2 to 4, the stepped anti-roll film winding core according to the present invention includes a cylindrical core 10, a carbon coating layer 20, and an etch groove (not shown) is formed on one side of the outer circumferential surface of the carbon coating layer 20 30 are formed.

The cylindrical core 10 is formed of fiber reinforced plastics (FRP).

When the cylindrical core 10 is made of fiber reinforced plastic, it is manufactured by mixing glass fibers and epoxy resin. In this case, since the strength of the cylindrical core is greatly increased, the total weight of the winding core can be reduced, The usability of the step-preventing film winding core can be greatly increased.

When the cylindrical core 10 is made of fiber reinforced plastic, the diameter and length of the tubular body can be easily determined in comparison with conventional general plastics, and the strength relative to the weight is increased, so that the winding core can be easily stored and transported .

Here, the surface of the cylindrical core 10 can be subjected to antistatic processing while being manufactured by mixing glass fiber and epoxy resin.

The antistatic treatment may be carried out by adding a surface active agent and synthesizing them together, or spraying a surface active agent onto the surface and polishing the surface.

After the antistatic treatment, the charge on the surface of the cylindrical core 10 is balanced, and the carbon coating layer 20 is uniformly formed, so that the efficiency of the manufacturing process can be greatly increased.

The carbon coating layer 20 may be formed to have a thickness of 200 탆 to 400 탆.

If the thickness of the carbon coating layer 20 is less than 200 탆, the etch groove 30 can not be formed while maintaining the function of the carbon coating layer.

There is a possibility that the type of the wound film may be limited and the cylindrical core 10 may be exposed due to wear of the carbon coating layer due to reuse of the winding core.

The thickness of the optically-usable optical film is generally in the range of 10 탆 to 300 탆, so that when the carbon coating layer 20 is formed with a thickness of 200 탆 to 400 탆, a sufficient etch groove 30 can be formed according to the film to be wound.

The thickness of the carbon coating layer may not exceed 400 占 퐉 in consideration of the thickness of the optical film, but when the thickness of the optical film exceeds 300 占 퐉, the carbon coating layer 20 may have carbon The thickness of the coating layer is increased and is not limited to a thickness of 400 탆.

The etch groove 30 is formed on the carbon coating layer 20 by laser processing on one side of the outer circumferential surface.

At this time, the etch groove 30 may be formed in such a manner that a depth is formed by etching the carbon layer by irradiating the carbon coating layer 20 with a laser.

The carbon coating layer 20 may be precisely etched by a laser.

The carbon coating layer 20 is excellent in reactivity to a laser, and thus can be etched without using high energy.

The reason why the carbon coating layer 20 having a predetermined thickness is formed on the outer circumference of the cylindrical core 10 is that the depth and width of the etching groove 30 can be precisely determined using a laser. A winding core corresponding to various optical films can be manufactured in various ways.

If the carbon coating layer 20 is not formed, it is difficult to form the etch groove 30 by etching through the laser. The carbon coating layer 30, which is more reactive with respect to the laser than the cylindrical core 10, The etching grooves 30 can be precisely formed.

In the case where the carbon coating layer 20 is not formed, if the etching grooves are formed by laser etching, a problem of additional processing time and post-processing may occur.

When the etch groove 30 is formed by etching the carbon coating layer 20 with a laser, there is an advantage that a separate polishing process is not necessary since the cutting surface of the laser with respect to the carbon coating layer 30 is formed very smoothly.

FIG. 5 is a cross-sectional view showing that the starting end of the film is wound around the etching hole in the stepped anti-roll film winding core according to the embodiment of the present invention.

Referring to FIG. 5, it can be seen that the starting end of the film is attached to the etching hole 30 and wound around the film winding core.

As the number of times the film is wound is increased, the portion protruding from the outermost film is greatly reduced, thereby preventing the film from being pressed and wrinkled, thereby preventing initial loss of the film.

According to another embodiment of the present invention, the etch groove is etched to increase the depth from one end of the etch groove to the other end to form a slope 32, and a step 31 is formed on a part of the slope 32 The starting end 37 of the film can be attached and fixed.

3, the inclined surface 32 is formed so that the other end of the etched groove is deeper than the depth of one end, and a step 31 is formed on a part of the inclined surface 32 Space is formed.

Therefore, the step 31 formed on a part of the inclined surface 32 forms a space in which the adhesive tape is disposed.

A space formed by the step is formed and the film can be attached without protruding by the adhesive tape.

Since the depth of the other end is formed deeper than the one end, the attachment surface on which the start end of the film is adhered can be formed wider and stably attached, and the film can be attached flatly So that the protrusion due to the winding of the film can be minimized.

FIG. 6 is a cross-sectional view showing that the starting end of a film is wound around an etching hole in a film winding core for anti-step prevention by precision etching according to another embodiment of the present invention.

6, a starting end 37 of the film is attached to the inclined surface of the etching groove, providing a space in which the adhesive tape 38 can be placed so that the starting end 37 of the film is closely contacted with the etching groove So that the protruding portion after winding of the film is greatly reduced.

Therefore, when the etch groove 30 is etched to increase the depth from one end of the etch groove to the other end, a thicker film can be wound than a etch groove having a constant depth.

According to another embodiment of the present invention, two etch grooves 34, 35 may be etched to form.

Referring to FIG. 4, the etching grooves 34 and 35 are formed adjacent to each other and can face each other.

The etch grooves 34 and 35 are formed so as to be deeper toward the remainder, and the start end of the film is attached and fixed to one of the etch grooves.

The etching grooves 34 and 35 are formed opposite to each other so that the film can be wound in both directions.

FIG. 7 is a cross-sectional view showing that the starting end of a film is wound around an etching hole in a film winding core for anti-step protection by precision etching according to another embodiment of the present invention.

In the case where the etching grooves 34 and 35 are formed in two, the film can be selectively wound in one direction or the other direction since the direction of attachment of the starting end of the film can be selected as one direction or the other direction.

Referring to FIG. 7, the film may be wound by attaching the starting end of the film to either one of the etching grooves. At this time, the starting end 37 of the film is attached to the etching groove, , It is possible to reduce the protruding portion after winding the film even if the number of times of winding is not greatly increased.

In the case where the etch grooves 34 and 35 are formed in two, it is very useful when the size of the step-preventing winding core is greatly increased and it is difficult to move the winding core and the determination of the winding direction of the film is important.

Therefore, it is possible to determine the direction in which the film is unwound without selecting any one of the etch grooves 31 and 32 and attaching the start end of the film and winding the film so that the step-preventing film winding core is not rotated directly. When the film is attached and wound with the start end, there is no need to re-attach the winding core according to the direction of the etched groove, and thus the work efficiency of the operator can be greatly improved.

On the other hand, the surface of the carbon coating layer 20 may be subjected to antistatic processing. When the carbon coating layer is subjected to the antistatic treatment with a surfactant or the like, the electrostatic attraction of the film can be prevented, so that the film can be easily wound and unwound.

According to another aspect of the present invention, there is provided a method of manufacturing a cylindrical core, comprising the steps of: (1) preparing a cylindrical core; Coating a carbon coating layer on the cylindrical core (second step); Determining a shape of an etch groove formed in the carbon coating layer (a third step); And forming an etch groove by irradiating the carbon coating layer with a laser (fourth step). The present invention also provides a method for manufacturing a stepped anti-film film winding core by precision etching.

The cylindrical core may be formed of a fiber reinforced plastic, and the fiber reinforced plastic may be prepared by mixing 30 parts by weight of an epoxy resin and 70 parts by weight of glass fibers, and the surface may be polished after the antistatic treatment (S100 ).

When the cylindrical core is formed of a fiber reinforced plastic, it is possible to easily manufacture the tubular body corresponding to the size of various films, and to increase the strength and reduce the weight.

When the surface of the cylindrical core is subjected to the antistatic treatment, electrostatic attraction is reduced in the carbon coating layer to uniformly cover the carbon coating layer.

The antistatic treatment may be carried out by mixing the surfactant or the like together, or by forming the tubular body with the fiber reinforced plastic, spraying a surfactant or the like and polishing the surface to reduce the electrostatic attraction.

A carbon coating layer may be coated on the cylindrical core (S200).

The carbon coating layer may be formed to a thickness of 200 탆 to 400 탆.

The carbon coating layer may be irradiated with a laser to form an etch groove (S400).

The thickness of the etch groove may be determined within the thickness of the carbon coating layer.

The etch groove may be formed in a laser etching apparatus, and an etch groove may be formed in accordance with the image by inputting an image to the laser etcher.

FIG. 9 is an image for laser etching in the method of manufacturing a film winding core for preventing stepped steps by precision etching according to an embodiment of the present invention.

Referring to FIG. 9, in the third step, the depth of the etch groove can be determined by determining the degree of etching of the laser according to the contrast of the image 50.

Therefore, when a carbon coating layer is formed and etched using a laser etching apparatus, the reactivity with the rare gas and the carbon coating layer is very advantageous for etching.

Further, when the etching groove is formed by using the image 50, the etching force can be adjusted according to the image, so that the etching groove can be precisely formed.

In the step of forming the etch groove, the etch groove may be etched to increase the depth from one end to the other end to form a slope, and a step may be formed on a part of the slope to form a space in which the adhesive tape is disposed.

An adhesive tape is disposed in the space, and a starting end of the film is adhered to and adhered to the etching groove.

The depth of the etch groove can be determined by adding the thickness of the film and the thickness of the adhesive layer. The width and depth of the etch groove can be variously determined by irradiating the carbon coating layer with laser, The core can be manufactured.

The etching groove is determined by a sum of the thickness of the film cross-section wound before the third step and the thickness of the adhesive layer formed on the inner surface of the etching groove, and is etched by the laser.

Therefore, in the case of forming the carbon coating layer and etching it with a laser to form an etching groove, the carbon coating layer can be etched through simple adjustment of the laser equipment without changing the process configuration, The process efficiency of the manufacturing method is greatly increased.

Although the embodiments of the film winding core for preventing step difference by precision etching according to the present invention and the method of manufacturing the same have been described above, it is apparent that various modifications are possible within the scope of the present invention.

Therefore, the scope of the present invention should not be construed as limited to the embodiments described, but should be determined by the scope of the appended claims, as well as the claims.

It is to be understood that the foregoing embodiments are illustrative and not restrictive in all respects and that the scope of the present invention is indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

1: protruding portion 10: cylindrical core
20: carbon coating layer 30, 33, 34, 35: etch groove
31: stepped portion 33: inclined surface
36: remainder 37: film starting end
38: Adhesive tape

Claims (16)

A cylindrical core; And
And a carbon coating layer formed on an outer circumferential surface of the core,
And an etch groove is formed through laser processing on one side of the outer circumferential surface of the carbon coating layer.
The cylindrical core is fiber reinforced plastics (FRP) in which glass fibers and epoxy resin are mixed,
The surface of the cylindrical core is subjected to antistatic processing to uniformly form the carbon coating layer,
The etching groove is formed by etching the carbon layer by irradiating the carbon coating layer with a laser. The etch groove is formed due to the reactivity of the carbon coating layer with respect to the laser,
The depth of the etch groove is determined by etching the laser according to the brightness of the previously recorded image,
Wherein the etch groove is etched to increase the depth from one end of the etch groove to the other end to form an inclined surface, wherein a stepped portion on which an adhesive tape is disposed is formed on a part of the inclined surface, Film wound core for preventing step by precision etching.
delete delete The method according to claim 1,
The carbon coating layer
Wherein the film is formed to have a thickness of 200 to 400 占 퐉.
delete delete delete The method according to claim 1,
The etch-
Wherein the two cores are formed adjacent to each other and are opposed to each other.
9. The method of claim 8,
The etch-
Wherein the film is formed so as to become deeper toward the remainder of the etching groove, and the starting end of the film is attached to one of the etching grooves so that the film can be wound in both directions.
The method according to claim 1,
The carbon coating layer
And the surface of the film is antistatic-treated.
Manufacturing a cylindrical core (first step);
Coating a carbon coating layer on the cylindrical core (second step);
Determining a shape of an etch groove formed in the carbon coating layer (a third step); And
And forming an etch groove by irradiating the carbon coating layer with laser (fourth step)
The cylindrical core is fiber reinforced plastics (FRP) in which glass fibers and epoxy resin are mixed,
The surface of the cylindrical core is subjected to antistatic processing to uniformly form the carbon coating layer,
The etching groove is formed by etching the carbon layer by irradiating the carbon coating layer with a laser. The etch groove is formed due to the reactivity of the carbon coating layer with respect to the laser,
The depth of the etch groove is determined by etching the laser according to the brightness of the previously recorded image,
Wherein the etch groove is etched to increase the depth from one end of the etch groove to the other end to form an inclined surface, wherein a stepped portion on which an adhesive tape is disposed is formed on a part of the inclined surface, A method for manufacturing a film winding core for preventing stepped steps through precision etching.
delete 12. The method of claim 11,
The carbon coating layer
Wherein the film is formed to a thickness of 200 to 400 탆.
delete delete 12. The method of claim 11,
The etch-
Wherein the thickness of the film is determined by a thickness of the film to be wound and a thickness of the adhesive layer formed on the inner surface of the etching groove and is etched by a laser.

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