KR102391880B1 - Protective film and metohd for fabricating the same - Google Patents

Abstract

A protective cover and a method for manufacturing the same are disclosed. The protective cover of the present invention includes a film having a bending area and a planar area, and a glass positioned on the planar area of the film, wherein the bending area is attached to an adherend material having a curved area, and It is characterized in that it is bent to correspond to a curved area. According to the present invention, the glass is positioned only on the bending region of the film, so that both the curved portion and the flat portion can be protected.

Description

PROTECTIVE FILM AND METOHD FOR FABRICATING THE SAME

The present invention relates to a protective cover and a method for manufacturing the same, and more particularly, to a protective cover capable of protecting both a curved portion and a flat portion by placing glass only on a bending region of a film, and a method for manufacturing the same.

In a wide range of technological and industrial fields such as video and optical equipment such as monitors, cameras, VTRs, mobile phones, transportation equipment such as automobiles, various tableware, and construction facilities, glass products are treated as essential components, and accordingly, the characteristics of each industrial field Glass having various physical properties has been manufactured and used in accordance with this.

Among them, in the case of a touch panel display, a resin substrate such as acrylic is used to protect the display. However, since the resin substrate has a low Young's modulus, there is a problem in that it tends to bend when the display surface of the display is pressed with a pen or a human finger or the like, and visibility is easily reduced.

The transparent substrate made of plastic has to be spaced apart from the screen at a predetermined distance to damage monitors such as liquid crystal screens, so there is a problem in that the thickness of the product becomes heavy. A material having a

SUMMARY OF THE INVENTION The present invention aims to solve the above and other problems. Another object of the present invention is to provide a protective cover capable of protecting both a curved portion and a flat portion by placing glass only on the bending region of the film, and a method for manufacturing the same.

According to one aspect of the present invention to achieve the above or other objects, it includes a film having a bending area and a planar area, and a glass positioned on the planar area of the film, wherein the bending area is applied to an adherend material having a curved area. It is attached and provides a protective cover that is bent to correspond to the curved area of the adherend material.

The glass may include opposing first and second long sides and first and second short sides connecting the first and second long sides, and the bending region may be formed along one of the first and second long sides. .

The glass includes first and second long sides opposite to each other and first and second short sides connecting the first and second long sides, and the bending area includes at least two of the first and second long sides and the first and second short sides. It may form in the stool.

The film may include a first surface in contact with the adhesion material and a second surface opposite to the first surface and to which the glass is attached.

The glass may be adhered between the adherend material and the film.

The glass may have a side that is inclined with respect to the planar area.

The inclination of the side surface may be formed through an etching process or a grinding process.

It may further include a connection member located on the side of the glass.

A side surface of the connecting member may be inclined with respect to the planar area.

At least a portion of the connecting member may further shield the edge of the upper surface of the glass.

The planar region of the film may include a groove formed in a thickness direction of the film, and the glass may be positioned in the groove.

It further includes a first adhesive positioned between the glass and the film and a second adhesive positioned on the lower surface of the glass and attached to the adhesion material, wherein the first adhesive and the second adhesive may have different bonding strengths. .

The bonding force of the first pressure-sensitive adhesive may be greater than that of the second pressure-sensitive adhesive.

The effect of the protective cover and its manufacturing method according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, the glass is positioned only on the bending region of the film to protect both the curved portion and the flat portion.

Further scope of applicability of the present invention will become apparent from the following detailed description. However, it should be understood that the detailed description and specific embodiments such as preferred embodiments of the present invention are given by way of example only, since various changes and modifications within the spirit and scope of the present invention may be clearly understood by those skilled in the art.

1 is a perspective view showing a protective cover according to the present invention.
2 is a plan view showing various embodiments of the protective cover according to the present invention.
3 is a cross-sectional view showing a protective cover according to the present invention.
4 to 6 are cross-sectional views showing various embodiments of the protective cover according to the present invention.
7 is a flowchart illustrating a method of manufacturing a protective cover according to the present invention.
8 is a cross-sectional view showing a protective cover according to the present invention.
9 and 10 are views showing various embodiments of a protective cover according to another embodiment of the present invention.
11 is a cross-sectional view illustrating a method of combining a protective cover and an adherent material according to another embodiment of the present invention.
12 to 15 are cross-sectional views showing various embodiments of the protective cover according to the present invention.
16 is a cross-sectional view showing a protective cover according to another embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numbers regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "part" for components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have distinct meanings or roles by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

1 is a perspective view showing a protective cover according to the present invention.

Referring to FIG. 1 , the protective cover 10 may be used for attaching materials 8 such as mobile (cell phone, PDA), LCD TV, LCD monitor, navigation, MP3, and notebook computers. The protective cover 10 may be attached to at least a portion of the adherend material 8 . The adhesion material 8 can be, for example, a touch screen. The protective cover 10 may transmit an image or a photo represented by the adherend material 8 to the outside and allow the user to recognize it.

At least a portion of the adhesion material 8 may have curvature. That is, it means that at least a part of the adhesion material 8 can be bent. Accordingly, at least a part of the protective cover 10 attached to the adherend material 8 may be bent.

The user may input a touch operation to the adherend material 8 through the protective cover 10 . Accordingly, the protective cover 10 may preferably have a thin thickness due to touch sensitivity.

The protective cover 10 may include a bending area BA and a planar area FA. The bending area BA may be an area in which the protective cover 10 is bent when attached to the adherend material 8 . The planar area FA may be an area in which the protective cover 10 is not bent when attached to the adherend material 8 .

2 is a plan view showing various embodiments of the protective cover according to the present invention.

Referring to FIG. 2 , the protective cover 10 according to the present invention may include a material having a bending area BA and a planar area FA different from each other. The bending area BA may include a material having low bending strength, and the planar area FA may include a material having high hardness. Accordingly, the protective cover 10 has excellent heat resistance and hardness, and can protect even a bent portion.

The bending area BA may include the film 130 . For example, the film 130 may be a film including any one of PC, COP, TAC, polyimide (PI), PMMA, PO (polyolefin), PET, and combinations thereof. The planar area FA may include the glass 120 . For example, glass 120 may include chemically strengthened glass. Chemical strengthening refers to generating compressive stress on the glass surface by replacing sodium and potassium ions contained in the glass with each other.

The glass 120 may include first and second long sides opposite to each other and first and second short sides connecting the first and second long sides. The first and second long sides may be longer than the first and second short sides. However, the present invention is not limited thereto, and the lengths of the first and second long sides and the first and second short sides may be the same.

For example, the bending area BA may be located on one side of the planar area FA. That is, it means that the bending area BA is formed along one of the first and second long sides. In this drawing, although only the bending area BA is illustrated to be located on the right side of the planar area FA, the present invention is not limited thereto, and the bending area BA may be located on the left side or upper and lower sides of the planar area FA.

As another example, the bending area BA may be positioned on two sides of the planar area FA. That is, it means that the bending area BA is formed on at least two of the first and second long sides and the first and second short sides. In this drawing, only the bending area BA is illustrated to be located on the left and right sides of the planar area FA, but the present invention is not limited thereto, and the bending area BA may be located on two of the four sides of the planar area FA.

As another example, the bending area BA may surround the planar area FA. In this case, each side of the bending area BA may be connected to each other.

Since the bending area BA and the planar area FA include different materials, it is possible to obtain the protective cover 10 that is bent similarly to the shape of the material to be adhered while having strong hardness and heat resistance. A detailed coupling relationship between the film 130 and the glass 120 will be described later.

3 is a cross-sectional view showing a protective cover according to the present invention.

Referring to FIG. 3 , when the film 130 is positioned along two sides connected to each other of the glass 120 , the film 130 may be spaced apart from each other by a predetermined distance FM at the vertex of the glass 120 . That is, it means that the bending areas BA are not connected to one another but are separated.

If the films 130 are connected to each other at the vertices of the protective cover, overlapping areas may be formed when bending the adherend material, resulting in an unclean appearance and poor visibility. In the protective cover according to the present invention, since the film 130 at the vertex is spaced apart by a predetermined distance (FM), the appearance is clean and visibility is good when attached to the adherend material, so that the user can conveniently use the adherend material.

4 to 6 are cross-sectional views showing various embodiments of the protective cover according to the present invention.

Referring to FIG. 4 , the glass 120 may be positioned on at least one surface of the film 130 . In detail, in the optical film 130 , the glass 120 may be positioned on the opposite surface of the surface attached to the adherend.

The glass 120 may be positioned on the planar area FA of the film 130 . That is, the glass 120 is not located in the bending area BA. The protective cover 10 may be attached by bending the bending area BA of the film 130 to match the shape of the material to be adhered.

In the protective cover 10 according to the present invention, the glass 120 is positioned on the flat area FA of the film 130 so that the film 130 and the glass 120 can be stably coupled. Also, since the film 130 is not located only in the bending area BA, the film 130 in the bending area BA may not be easily separated.

Referring to FIG. 5 , the glass 120 is positioned on the planar area FA of the film 130 , and the side of the glass 120 may be inclined. For example, both sides of the glass 120 may be inclined by a first angle AE1 from the ground. Accordingly, a step difference between the interface between the film 130 and the glass 120 may be reduced. The user may have improved visibility as the step difference of the above-described boundary surface is reduced.

Both sides of the glass 120 may be inclined using a grinding or etching process.

In particular, when the protective cover 10 is bent, the bending surface of the film 130 and the inclined side of the glass 120 may be maintained in a straight line. Accordingly, visibility at the boundary of the bending area BA in the planar area FA may be particularly improved.

Referring to FIG. 6 , the connecting member 150 may be coated on the boundary between the planar area FA and the bending area BA. That is, it means that both sides of the glass 120 are coated with the connecting member 150 . The connecting member 150 may be a material having high adhesion to the glass 120 . In addition, the connecting member 150 may have the same or similar light transmittance and refractive index to the glass 120 . For example, the connecting member 150 may include acrylic and silicone resin.

Since the connecting member 150 is coated on both sides of the glass 120 , it is possible to protect the weak side of the glass 120 .

As shown in (a) of FIG. 6 , the connection member 150 may be positioned on the side surface of the glass 120 with a certain inclination. As another example, as shown in FIG. 5 (b), the connecting member 150 may be positioned at the edge of the side and the upper surface of the glass 120 with a change in inclination.

7 is a flowchart illustrating a method of manufacturing a protective cover according to the present invention. 8 is a cross-sectional view showing a protective cover according to the present invention.

7 and 8 , in order to manufacture the protective cover according to the present invention, first, the first adhesive 115 may be coated on the first PET 110 (S10). In detail, the first PET 110 may be coated with the first adhesive 115 to pass through chambers having different temperatures of 50 to 70°C. The temperature of the chamber may gradually rise and then fall again. The first adhesive 115 may be stabilized by removing volatility as it passes through the chamber.

The first adhesive 115 may include OCA, OC, epoxy resin, curing agent, filler, diluent, polyol (diol), diisocyanate, solvent, UV polymerizable oligomer, reactive diluent, additive, photopolymerization initiator, and combinations thereof. may include any one.

Next, the film 130 and the glass 120 may be transfer-coated on the first adhesive 115 (S20). That is, it means that the film 130 and the glass 120 are coated on the first pressure-sensitive adhesive 115 that has passed through the plurality of chambers.

Next, the first adhesive 115 and the second PET 140 may be laminated on the binder in which the film 130 and the glass 120 are bonded (S30). In detail, the first adhesive 115 and the second PET 140 may be laminated after the film 130 and the glass 120 are coupled through the plurality of chambers described above. The second PET 140 may include the same or similar material as the first PET 110 .

The shape of the protective cover 10 when this process is advanced is shown in FIG. 8 .

Next, the first adhesive 115 and the glass may be combined (S40). In detail, after the first PET 110 is removed, the first adhesive 115 may be attached to the glass. The glass may be the above-described adhesion material (8 in FIG. 1 ).

When the glass is transported through the conveyor belt, the protective cover 10 rotates and may be combined with the glass. At this time, the first PET 110 may be peeled off and removed, and the first adhesive 115 and the glass may be combined. The peeled first PET 110 may be rewound on another roller.

Finally, after washing the protective cover 10 combined with the glass, the second PET 140 and the first adhesive 115 may be removed. Due to the second PET 140 , the protective covers 10 may not stick to each other when washing. Accordingly, the cleaning process is easily performed, and the glass may not be broken by the tension of the second PET 140 .

After the washing is finished, the second PET 140 and the first adhesive 115 may be removed to complete the manufacturing process of the protective cover 10 combined with the glass.

Although each of the first adhesives 115 is shown to be the same in this drawing, the present invention is not limited thereto, and the first adhesives 115 may have different adhesive strengths. For example, the adhesive strength of the first adhesive 115 positioned on the first PET 110 and the first adhesive 115 positioned under the second PET 140 may be different from each other.

9 and 10 are views showing various embodiments of a protective cover according to another embodiment of the present invention.

9 and 10 , in order to manufacture the protective cover according to the present invention, first, the second adhesive 112 may be coated on the first PET 110 ( S120 ). The second adhesive 112 may include a material different from that of the first adhesive 115 positioned between the film and the glass. Accordingly, the second adhesive 112 may have a different adhesive strength from the first adhesive 115 .

By coating the second adhesive 112 on the first PET 110, it may pass through chambers having different temperatures of 50 to 70°C. The temperature of the chamber may gradually rise and then fall again. The second adhesive 112 may be stabilized by removing volatility as it passes through the chamber.

The second pressure-sensitive adhesive 112 may include OCA, OC, epoxy resin, curing agent, filler, diluent, polyol (diol), diisocyanate, solvent, UV polymerizable oligomer, reactive diluent, additive, photopolymerization initiator, and combinations thereof. may include any one.

Next, the film 130 and the glass 120 may be transfer-coated on the second pressure-sensitive adhesive 112 (S120). That is, it means that the film 130 and the glass 120 are coated on the second pressure-sensitive adhesive 112 that has passed through the plurality of chambers.

Next, the third adhesive 114 and the second PET 140 may be laminated on the assembly in which the film 130 and the glass 120 are bonded (S130). The third adhesive 114 may include a material different from that of the first adhesive 115 and the second adhesive 112 . Accordingly, the third adhesive 114 may have different adhesive strength from the first adhesive 115 and the second adhesive 112 . In detail, the first adhesive 115 and the second PET 140 may be laminated after the film 130 and the glass 120 are coupled through the plurality of chambers described above. The second PET 140 may include the same or similar material as the first PET 110 .

The protective cover according to the present invention does not separate the first PET 110 and the second PET 140 during the process, and when the user attaches the glass to the protective cover, the first PET 110 and the second PET 140 can be separated. Accordingly, the process can be simplified and cost can be saved. In addition, since the glass is not bonded during the process, users can use it with various glasses they own.

11 is a cross-sectional view illustrating a method of combining a protective cover and an adherent material according to another embodiment of the present invention.

Referring to FIG. 11 , as shown in FIG. 11A , the first PET 110 may be separated first. That is, the user may separate the first PET 110 from the second adhesive 112 by applying an external force. Since only the first PET 110 needs to be separated from the second adhesive 112 , the second adhesive 112 has a bonding force of the side bonding with the film 130 to that of the side bonding with the first PET 110 . It may be greater than the bonding force.

In addition, in order to separate only the first PET 110 by external force, the binding force of the second adhesive 112 may be weaker than that of the first adhesive 115 or the third adhesive 114 .

Next, as shown in (b) of FIG. 11 , a protective cover may be attached on the adhesion material 8 . That is, it means that the second adhesive 112 and the adhesion material 8 of the lower surface of the protective cover are attached. In order to facilitate attachment and detachment when the user desires the protective cover, the bonding force of the surface bonding to the film 130 may be greater than the bonding strength of the surface bonding to the adherend material 8 of the second adhesive 112 .

Next, as shown in FIG. 11C , the user may separate the third adhesive 114 from the second PET 140 by applying an external force. Since both the second PET 140 and the third pressure-sensitive adhesive 114 must be separated, the third pressure-sensitive adhesive 114 has the same bonding strength between the second PET 140 and the glass 120 as the third adhesive 114 and the glass 120 . It may be larger than the surface to be combined with.

In addition, in order to separate the second PET 140 and the third adhesive 114 together by an external force, the binding force of the third adhesive 114 may be greater than that of the second adhesive 112 .

Through this process, it is possible to complete the attachment of the protective cover to the adherend material 8 as shown in FIG. 11 (d).

12 to 15 are cross-sectional views showing various embodiments of the protective cover according to the present invention. 16 is a cross-sectional view showing a protective cover according to another embodiment of the present invention.

Referring to FIG. 12 , the film 130 may be positioned on the glass 120 . In detail, the planar area FA of the film 130 may be positioned on the glass 120 .

A user may bend the bending area BA of the film 130 to fit the shape of the adherend material.

In the protective cover 10 according to the present invention, since the film 130 is located on the glass 120, the interface between the film 130 and the glass 120 does not appear when the user sees it, so it can feel neat in appearance. .

Referring to FIG. 13 , the connection members 150 may be positioned on both sides of the glass 120 . Before attaching the protective cover 10 , the connecting member 150 may not come into contact with the glass 120 . On the other hand, when the bending area BA is bent and attached to the adherend material, the connecting member 150 may contact the glass 120 and the film 130 .

Accordingly, the user may recognize that the appearance is neat because there is no step difference between the boundary between the film 130 and the glass 120 .

Referring to FIG. 14 , both sides of the glass 120 may be inclined by a second angle AE2 with respect to the ground. That is, it means that the width of the glass 120 becomes narrower toward the upper surface.

Both sides of the glass 120 may be inclined using a grinding or etching process.

The glass 120 may be spaced apart from the bending area BA of the glass 120 before being attached to the adhesion material. However, after the bending area BA of the film 130 is bent, the inclined side surface of the glass 120 and one surface of the bending area BA of the film 130 may contact each other.

Accordingly, the user can recognize that the boundary between the film 130 and the glass 120 does not appear to be a step difference, and the film 13 and the glass 120 are in contact with each other so that the bending region of the film 130 is not visible. (BA) may not be damaged.

15 and 16 , the glass 120 may be attached to the recess 117 in the planar area FA of the film 130 . The width of the groove 117 may be equal to or greater than the width of the glass 120 . The groove 117 may be obtained by etching or grinding the glass 120 .

The glass 120 may be attached to the inside of the groove 117 through an adhesive 115 . In this case, the upper surface 120a of the glass 120 may have the same height or lower than the upper surface 130a of the bending area BA of the film 130 . Accordingly, the user may feel that the appearance is neat because a step does not appear at the boundary between the two materials.

In this case, the side of the glass 120 may not be attached to the film 130 in order not to break the glass 120 when bending the bending area BA.

The above detailed description should not be construed as restrictive in all respects and should be considered as exemplary. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

10: protective cover 120: glass
130: film FA: flat area BA: bending area

Claims (13)

An integrated film having a bending region containing a material having a weak bending strength and a flat region containing a material having a strong hardness; and
It includes a glass that is installed in a state of being superimposed on the upper surface of the flat area of the film,
the bending region is bent corresponding to the curved region of the adherend material so that the bending region and the bottom surface of the planar region can be attached to the adherend material having the curved region;
The glass is formed to be inclined in a straight line with respect to the flat area, and the bent surface of the bending area and the inclined side of the glass are directly connected to a protective cover configured to maintain a straight line.
According to claim 1,
The glass is
Opposite first and second long sides;
It includes first and second short sides connecting the first and second long sides,
The bending area is
A protective cover formed along one of the first and second long sides.
According to claim 1,
The glass is
Opposite first and second long sides;
It includes first and second short sides connecting the first and second long sides,
The bending area is
A protective cover formed on at least two of the first and second long sides and the first and second short sides.
According to claim 1,
The film is
a first surface in contact with the adherent material;
A protective cover facing the first surface and comprising a second surface to which the glass is attached.
delete delete The method of claim 1,
The slope of the side is,
A protective cover formed through an etching process or a grinding process.
The method of claim 1,
Protective cover further comprising a connection member located on the side of the glass.
9. The method of claim 8,
The side of the connection member,
A protective cover inclined with respect to the flat area.
10. The method of claim 9,
At least some of the connecting members,
A protective cover that further covers the upper edge of the glass.
The method of claim 1,
the planar area of the film,
It includes a groove formed in the thickness direction of the film,
The glass is
A protective cover located in the groove.
The method of claim 1,
A first pressure-sensitive adhesive positioned between the glass and the film;
It is located on the lower surface of the glass and further comprises a second pressure-sensitive adhesive attached to the adhesion material,
The first pressure-sensitive adhesive and the second pressure-sensitive adhesive protective cover is different from each other.
13. The method of claim 12,
The binding force of the first pressure-sensitive adhesive is
A protective cover greater than the binding force of the second pressure-sensitive adhesive.

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