KR102463342B1 - Protective film and method 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 is coupled to a glass including a flat area covering at least a partial area of the flat area among adherend materials having a curved area and a flat area, and a side surface of the glass without an area overlapping with the glass, and a film including a bending region that is bent to fit the curved region. According to the present invention, the glass is positioned in the planar region and the film is positioned in the bending region, so that both the curved portion and the flat portion of the adherend material can be protected.

Description

PROTECTIVE FILM AND METHOD FOR FABRICATING THE SAME

The present invention relates to a protective cover and a method for manufacturing the same, and more particularly, a protective cover capable of protecting both a curved portion and a flat portion of an adherend material by placing glass in a flat area and a film in a bending area, and manufacturing the same it's about how

Glass products are treated as essential components 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 with various physical properties is manufactured and used according to the

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, and visibility is easily reduced.

The transparent substrate made of plastic has a problem in that the thickness of the product becomes heavy because it has to be spaced apart from the screen at a predetermined distance to damage the monitor such as a liquid crystal screen. 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 of an adherend material by placing glass in the flat area and film in the bending area, and a method for manufacturing the same.

According to an aspect of the present invention to achieve the above or other objects, a glass including a flat area covering at least a partial area of the flat area among the adherend material having a curved area and a flat area, and without an area overlapping the glass It is coupled to the side surface of the glass, and provides a protective cover comprising a film including a bending region to be bent to fit the curved region.

A first side of the glass may be in contact with a second side of the film corresponding to the first side.

The first side of the glass and the second side of the film corresponding to the first side may be spaced apart from each other.

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 film may be formed along a side of one of the first and second long sides. have.

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 film includes at least two sides of the first and second long sides and the first and second short sides. can be formed in

The first and second sides may be coupled by a first adhesive.

The glass and the protective cover may be bonded to each other by the adhesion material and a second adhesive, and the first adhesive and the second adhesive may have different bonding strengths.

The binding force of the first adhesive may be greater than that of the second adhesive.

The second pressure-sensitive adhesive may have a bonding strength of a surface bonding to the adherend material is less than a bonding strength of a surface bonding to the glass and the film.

The first side may have a wedge-shaped side or a protrusion.

The film may further include a horizontal region covering at least another region of the flat region.

Further comprising a second film positioned between the glass and the adhesion material, wherein at least a portion of the second film is in contact with the glass, and at least another area of the second film is in contact with the film.

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 in the planar area and the film is positioned in the bending area, so that both the curved portion and the flat portion of the adherend material can be protected.

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 illustration 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 8 are cross-sectional views showing various embodiments of the protective cover according to the present invention.
9 is a flowchart illustrating a method of manufacturing a protective cover according to the present invention.
10 and 11 are cross-sectional views showing a protective cover according to the present invention.
12 and 13 are views showing various embodiments of a protective cover according to another embodiment of the present invention.
14 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.

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 numerals 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 this specification, and the technical idea 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, an adhesion material. The protective cover 10 may allow the user to recognize the image or photo shown by the adherend material 8 by penetrating it to the outside.

At least a portion of the adhesion material 8 may have a 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 of the planar area FA or above and below 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 positioned 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 regions may be formed when bending the adherend material, which may result in an unsightly 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 8 are cross-sectional views showing various embodiments of the protective cover according to the present invention.

Referring to FIG. 4 , the film 130 may be attached to both sides of the glass 120 . In detail, the glass 120 may be positioned in the planar area FA and the film 130 may be positioned in the bending area BA.

The protective cover 10 may be attached by bending the film 130 located in the bending area BA to match the shape of the adherend material. In this case, since the film 130 is positioned on the side of the glass 120 , a step may not occur at the boundary between the film 130 and the glass 120 . Accordingly, the user may recognize that the appearance is cleaner.

Referring to FIG. 5 , the second film 132 may be positioned on the lower surfaces of the glass 120 and the film 130 . In detail, the second film 132 may be positioned on at least a portion of the bending area BA and the lower surface of the planar area FA. The second film 132 may include the same or similar material as the film 130 .

The second film 132 may be coupled to both the film 130 and the glass 120 . Accordingly, the film 130 and the glass 120 may compensate for the insufficient bonding strength by the second film 132 .

Referring to FIG. 6 , the glass 120 and the film 130 may be spaced apart from each other by a predetermined distance PD. In detail, the glass 120 is coupled to the center of the second film 132 , the film 130 is coupled to the edge of the second film 132 , and the film 130 is a bending region of the second film 132 . (BA) can be bound only to a part.

When bending so as to be attached to the adhesion material, the glass 120 and the film 130 may be bent from a portion spaced apart from each other by a predetermined distance PD. In this case, the portion of the film 130 coupled to the second film 132 may be smaller than that in which the glass 120 and the film 130 are coupled. Accordingly, when the film 130 is bent, the curvature may be smaller than when the glass 120 and the film 130 are combined. Since the film 130 has a small curvature when it is bent, it may not be well separated from the second film 132 .

Referring to FIG. 7 , the glass 120 and the film 130 may have various shapes and may be combined.

For example, as shown in (a) of FIG. 7 , the side of the glass 120 may be inclined at a first angle AE from the ground. In this case, even if the film 130 is bent, the bond between the glass 120 and the film 130 may not be separated by the inclination. Accordingly, the glass 120 and the film 130 may be attached more strongly than when vertically coupled.

As another example, as shown in (b) and (c) of Figure 7, the glass 120 may include a wedge 127 or a protrusion 129 on the side. In this case, the contact area between the glass 120 and the film 130 may be larger than that in the case of being vertically coupled. Accordingly, the bonding force between the glass 120 and the film 130 may be greater.

Referring to FIG. 8 , the film 130 may extend not only to the bending area BA but also to the planar area FA. That is, only a part of the film 130 may be attached to the adherend material by being banded. In this case, it may be defined that the film 130 extending in the planar area FA is positioned in the horizontal area.

In this case, the boundary between the bending area BA and the planar area FA may not coincide with the boundary between the film 130 and the glass 120 . Accordingly, a small external force may act on the interface between the glass 120 and the film 130 . Accordingly, the film 130 and the glass 120 may not be damaged or separated.

9 is a flowchart illustrating a method of manufacturing a protective cover according to the present invention. 10 and 11 are cross-sectional views showing a protective cover according to the present invention.

9 and 10 , 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.

In detail, after the film 130 is coated on the bending area BA on the first adhesive 115 , the first adhesive 115 may be coated on the side surface. After the first adhesive 115 is coated on the side surface, the glass 120 may be coated on the planar area FA on the first adhesive 115 .

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 combined 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 progressed is shown in FIG. 9 .

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 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 from each other. 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.

Referring to FIG. 11 , the first adhesive 115 may not be coated between the glass 120 and the film 130 . The urethane component of the film 130 may have an adhesive force by itself. Accordingly, the first adhesive 115 may not be positioned between the glass 120 and the film 130 . Since the first adhesive 115 is also located on the lower surface of the glass 120 and the film 130, the bonding can be maintained only by the bonding force of the urethane component.

12 and 13 are views showing various embodiments of a protective cover according to another embodiment of the present invention.

12 and 13, in order to manufacture the protective cover according to the present invention, first, a 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 130 and the glass 120 . Accordingly, the second adhesive 112 may have a different adhesive strength from that of 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.

In detail, after the film 130 is coated on the bending area BA on the second adhesive 112 , the first adhesive 115 may be coated on the side surface. After the first adhesive 115 is coated on the side surface, the glass 120 may be coated on the planar area FA on the second adhesive 112 .

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 combined 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.

14 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. 14 , as shown in FIG. 14A , 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 between the film 130 and the glass 120 and the first PET 110 . It may be greater than the bonding force of the surface bonding to.

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. 14 , 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 wants a protective cover, the bonding force of the side bonding to the film 130 and the glass 120 may be greater than the bonding strength of the side bonding to the adhesion material 8 of the second adhesive 112 . have.

Next, as shown in FIG. 14C , 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 a strong bonding force between the second PET 140 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. 14 (d).

The above detailed description should not be construed as restrictive in all respects and should be considered as illustrative. 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 (12)

a glass including a curved area and a flat area covering at least a partial area of the flat area of the adherend material having a flat area; and
a film positioned on the side of the glass without a region overlapping with the glass, and including a bending region bent to fit the curved region;
A second film is installed between the glass and the adherend material, wherein at least a portion of the second film is in contact with the glass, and at least another area of the second film is in contact with the film,
A protective cover configured such that the first side of the glass and the second side of the film corresponding to the first side are spaced apart from each other.
The method of claim 1,
A protective cover in which the first side of the glass is in contact with the second side of the film corresponding to the first side.
delete The method of claim 1,
The glass is
The first and second long sides opposite to each other;
It includes first and second short sides connecting the first and second long sides,
The film is
A protective cover formed along the side of one of the long sides of the first and second long sides.
The method of claim 1,
The glass is
The first and second long sides opposite to each other;
It includes first and second short sides connecting the first and second long sides,
The film is
A protective cover formed on at least two of the first and second long sides and the first and second short sides.
The method of claim 1,
The first and second aspects are
A protective cover coupled by the first adhesive.
7. The method of claim 6,
The glass and the film,
It is combined with the adhesion material by a second adhesive,
The first pressure-sensitive adhesive and the second pressure-sensitive adhesive protective cover is different from each other.
8. The method of claim 7,
The binding force of the first pressure-sensitive adhesive is,
A protective cover greater than the binding force of the second pressure-sensitive adhesive.
8. The method of claim 7,
The second adhesive is
The bonding force of the surface bonding to the adhesion material is,
A protective cover smaller than the bonding force of the surface bonding to the glass and the film.
The method of claim 1,
The first side of the glass,
A protective cover with a wedge-shaped or protruding side on the side.
The method of claim 1,
The film is
The protective cover further comprising a horizontal area covering at least another area of the flat area.
delete

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