KR20180055235A - Surface protective sheet having enhanced flexibility and method for manufacturing thereof - Google Patents

Abstract

The present invention relates to a surface protective paper, and specifically, to a surface protective paper, which comprises: a protective layer; a base film provided on the protective layer; an adhesive layer provided on the base film; and a release film provided on the adhesive layer. The surface protective paper is easy to use, has durability, is excellent in flexibility, and exhibits strong adhesion even in a bending region.

Description

TECHNICAL FIELD [0001] The present invention relates to a surface protecting sheet having improved flexibility and a method of manufacturing the surface protecting sheet. [0002]

The present invention relates to a surface protective sheet having improved flexibility and a method for producing the same, and more particularly, to a surface protective sheet which can be conveniently used, has excellent durability and flexibility, and exhibits strong adhesion even in a bending region, and a method for producing the same.

Various methods have been proposed to prevent the surface of a product having a surface of glass, ceramics, plastic, metal, and the like, in particular, a surface of a household electric appliance or a portable electronic product (a cell phone, an MP3 player, , One of which is to attach the surface protection paper.

Conventionally, the surface protection layer has a weak protective layer material, which makes it difficult to properly perform the function of protecting the surface of the adherend. Also, when the surface protective paper is adhered to the adherend and then the surface protective paper is removed when necessary, the pressure sensitive adhesive or the adhesive may be transferred to the adherend surface due to the physical properties of the adhesive to contaminate the adherend surface or to adhere to the adherend surface It causes damage. In particular, the high adhesion force, which is unsuitable for expensive portable electronic devices, may damage the coating surface or the painting surface of the adherend, thereby increasing the user's dissatisfaction.

In addition, there is a problem that the surface protection paper has a restoring force exceeding the adhesive force of the pressure-sensitive adhesive or the adhesive in the stepped portion, the curved surface, the curved surface, and the edge region (hereinafter, referred to as the bending region) .

In this case, a soft pattern having grooves or lines is formed on one surface of the surface protective paper to increase the adhesive force in the bending area. However, in this case, when the surface protective paper adheres to the bending area, There is a problem that the adhesion failure phenomenon occurs.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. One aspect of the present invention is to provide a protective layer material having a high durability and capable of preventing the surface of the adherend from remaining on the surface of the adherend, It is an object of the present invention to provide a surface protecting paper which exhibits a strong adhesion and has a beautiful pattern.

Another aspect of the present invention is to provide a method of manufacturing the above-mentioned surface protective paper.

According to an aspect of the present invention,

A protective layer;

A base film provided on the protective layer;

A pressure-sensitive adhesive layer provided on the base film; And

And a release film provided on the pressure-sensitive adhesive layer.

At this time, a first adhesive layer may be further provided between the protective layer and the base film.

At least one of the protective layer, the first adhesive layer, the base film, the pressure-sensitive adhesive layer, and the release film may be formed, and the porosity may be 10 to 70%.

It is preferable that the protective layer is a single main raw material or an auxiliary raw material is joined to a surface of the main raw material and the main raw material facing the base film.

In addition, it is preferable that a second adhesive layer is included between the main raw material and the auxiliary raw material.

Also, the main fabric is made of leather, preferably artificial kills, more preferably Alcantara, and the thickness may be 0.02 mm to 5 mm.

Preferably, the auxiliary fabric is one selected from the group consisting of PU, PVC, PET, PP, PE, nonwoven fabric, paper, fiber and OPP, and the thickness may be 10 μm to 300 μm.

The protective layer may further include at least one layer selected from the group consisting of an antistatic layer, a scratch-resistant coating layer, and an electromagnetic wave shielding layer on at least one side of the protective layer.

Further, it is preferable that a UV coating layer or a varnish layer is further formed on the surface of the protective layer exposed to the outside.

The material of the base film may be selected from the group consisting of polyurethane, polypropylene oxide, polyisocyanate, hydroxy ethyl, polyvinylchloride, polyethylene terephthalate (PET) But are not limited to, mono acrylate, poly acrylate, poly methylmethacrylate, polycarbonate, polyethylene, methacryalte, polypropylene, , Cellulose acetate butyrate (CAB), ethylene vinyl acetate (EVA), polyvinyl alcohol (PVA), acrylate, propylene oxide, polypropylene, polyethylene, OPP Oriented polypropylene), PVC, and copolymers thereof.

It is preferable that the release film is coated on one side of a release paper selected from the group consisting of paper, polypropylene, polyethylene terephthalate, OPP (Oriented Polypropylene), and PVC.

Further, it is preferable that the release film is coated with PE, silicon or fluorine with a thickness ranging from 2 to 150 mu m on the surface.

The pressure sensitive adhesive and adhesive used for the adhesive layer and the pressure sensitive adhesive layer may preferably be an emulsion type as silicone, acrylic, or hot melt adhesive and pressure sensitive adhesive.

At this time, when the pressure sensitive adhesive is silicone, the release film provided on the pressure sensitive adhesive layer is preferably coated with fluorine.

Further, the pressure-sensitive adhesive layer is preferably formed in an embossed shape.

According to another aspect of the present invention,

Forming a protective layer;

An adhesive layer forming step of applying and drying an adhesive on the protective layer;

A base film forming step of forming a base film on the adhesive layer;

A pressure-sensitive adhesive layer forming step of forming an pressure-sensitive adhesive layer on the base film; And

And a release film forming step of forming a release film on the pressure-sensitive adhesive layer.

Further, it may further include a step of puncturing at least one of the protective layer, the adhesive layer, the base film, the adhesive layer, and the release film.

In addition, the forming of the protective layer may further include the step of applying an adhesive to the surface of the protective layer facing the adhesive layer, followed by laminating the auxiliary fabric.

In addition, it is preferable that the temperature is in the range of 20 to 300 DEG C and the pressure is in the range of 5 to 110 MPa.

Further, it is preferable to further include a compression bonding step of forming a desired thickness of the surface protective paper between the rollers and the rollers after the release film forming step.

In addition, the formation of the adhesive and the pressure-sensitive adhesive may be carried out by spray coating, a rotary screen process, a roll coating process, a plate coating process, a fine precision coating process, a UV coating process, a one- , A screen coating process of a PCB, and a gravure coating process.

According to another aspect of the present invention,

And laminating a film produced in the order of a release film, a base film, an adhesive layer and a release film on a protective layer.

Further, it may further include a step of puncturing at least one of the protective layer, the base film, the adhesive layer, and the release film.

According to another aspect of the present invention,

The release film of the above-mentioned surface protective paper is removed and adhered to the adherend.

Further, the liquid material is applied to the adherend or the substrate film sticking surface before the surface protective paper from which the release film is removed is adhered to the adherend.

According to an aspect of the present invention,

First, there is an advantage that the durable material suitable for protecting the surface is made of a single layer, thereby maximizing the surface protection effect and making the appearance more beautiful.

Second, the protective layer of the surface protective paper according to the present invention has a strong adhering force with the adhesive, so that when the surface protective paper is removed from the adherend, there is an effect that the surface is damaged or the base film does not remain on the surface.

Third, the surface protection sheet according to the present invention can be perforated if necessary. In this case, it exhibits a strong adhesive force even in a bending region, and prevents the adherence failure phenomenon due to the air being easily adhered.

1 is an explanatory diagram of a surface protection sheet according to an embodiment of the present invention.
2 is a photograph showing the shape of a pore of a surface protective paper according to an embodiment of the present invention.

As used herein, the term "comprising" is used to specify that a feature, step, or combination thereof is described in the specification, and that the presence or addition of one or more other features, steps, It should be understood that it is not excluded. Also, the meaning of " formed on " is used to mean a positional relationship formed adjacent to each other, and is used to mean that it can be formed on the lower or upper part when the position is changed, Does not exclude the presence of other components. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

The surface protection sheet 100 according to the first embodiment of the present invention comprises a protective layer 110, a base film 130, an adhesive layer 140, and a release film 150. 1 is a view for explaining an embodiment according to the present invention. In the following description of the embodiments, the upper and lower surfaces mean the upper and lower surfaces as shown in the drawings for convenience of explanation.

In addition, a first adhesive layer 120 may be additionally provided between the protective layer and the base film.

In the present invention, in order to further impart flexibility to the surface protective paper, it is possible to bend the surface protective paper 100 along the curved surface of the adhering material by burying the film including the base film and the pressure sensitive adhesive layer, In particular, there is an advantage that air deficiency can be reduced by removing air. At this time, the porosity may be 10 to 70%.

In the present invention, the pattern of the puncture may be circular, and may be a square or honeycomb hexagon, depending on the case. FIG. 2 is a perspective view showing the punch shape of the surface protection paper according to an embodiment of the present invention.

Further, in addition to the film, the protective layer or the release film may be further punctured.

In this embodiment, the protective layer 110 is made of leather as a main raw material, and artificial leather or natural leather can be used as the leather material, but Alcantara material can be preferably used as artificial leather.

At this time, the thickness of the protective layer 110 may vary depending on the use purpose and use of the surface protective paper 100, but is preferably in the range of 0.02 mm to 5 mm.

The protective layer 110 may be a main raw material alone or an auxiliary raw material joined to a surface of the main raw material and the main raw material facing the base film.

One of PU, PVC, PET, PP, PE, non-woven fabric, paper, fiber and OPP having a thickness of 10 탆 to 300 탆 is provided on the top surface of the protective layer 110 in order to enhance surface protection function and prevent artificial leather from stretching. And a second adhesive layer 113 may be formed between the main fabric 111 and the auxiliary fabric 115. The second adhesive layer 113 may be formed of a second adhesive layer 113,

On the other hand, various functional layers can be added to the upper or lower surface of the protective layer 110 by coating pigments and pastes. That is, a conductive polymer and a synthetic resin containing a metal component may be coated as an antistatic layer, or an antistatic thin film may be deposited to prevent static electricity and to prevent a dust collecting phenomenon.

In addition, the scratch-preventive coating layer can be formed to prevent scratches and damage of the protective layer 110, to clean the scratch-free coating layer without scratches, and to prevent damage to the protective layer 110 from external chemical damage. In particular, the upper surface of the protective layer 110 may form a UV coating layer or a varnish layer as a surface that forms a surface when adhered to an adherend. When the UV coating layer or the varnish layer is formed, it is preferable that the lower surface is processed after the sanding treatment.

At this time, the anti-scratch coating layer may include a low-gloss coating layer to prevent irregular reflection caused by external light.

Further, an electromagnetic wave shielding layer can be formed to block electromagnetic waves generated in the adherend or the external environment. The electromagnetic wave shielding layer can be produced by mixing fine metal particles made of ultra-fine particles and fine carbon paste.

The base film 130 serves to balance the protective layer 110, improve rigidity and function as a surface to be adhered to the adherend, and is formed on the upper surface of the protective layer 110. The material of the base film 130 may be selected from the group consisting of polyurethane, polypropylene oxide, polyisocyanate, hydroxy ethyl, polyvinylchloride, polyethylene terephthalate (PET), mono acrylate, polyacrylate, poly methylmethacrylate, polycarbonate, polyethylene, methacryalte, polypropylene polypropylene, cellulose acetate butyrate (CAB), ethylene vinyl acetate (EVA), polyvinyl alcohol (PVA), acrylate, propylene oxide, polypropylene, polyethylene, , OPP (Oriented polypropylene), PVC, or a copolymer thereof.

The release film 150 is provided to release the pressure-sensitive adhesive layer 140 formed between the release film 150 and the base film 130 and the protective layer 110 to release the release paper, On the back side of the release film, company logos and trademarks can be listed.

As the releasing paper, it is possible to use paper, polypropylene (PP), polyethylene terephthalate, OPP (Oriented polypropylene) and PVC, and PE, silicone or fluorine Coating to form a release film.

In this embodiment, the first adhesive layer 120 is positioned between the protective layer 110 and the base film, and the adhesive layer 140 is positioned between the base film 130 and the release film 150.

The pressure-sensitive adhesive and adhesive used for the first adhesive layer 120, the second adhesive layer 113 and the pressure-sensitive adhesive layer 140 may be a silicone, acrylic, or hot-melt adhesive having a condition satisfying compliance and bending- It is preferable to adopt an emulsion type as a hot melt adhesive and a pressure sensitive adhesive.

Examples of acrylic adhesives and pressure sensitive adhesives include ethyl acrylate (ethylhexyl acrylate), butylacrylate, ethyl acrylate, ethylacetate, and methyl methacrylate, acrylic acid ) Of the present invention is prepared by using an adhesive and a pressure-sensitive adhesive prepared by intermixing a solvent with a solvent in a weight range of 10 to 90% in accordance with the adhesive and adhesive strength required for the product and the viscosity required for the production.

As the hot melt adhesive and pressure sensitive adhesives, ethylene vinyl acetate (EVA), polyamide, polyester, polyurethane, and rubber are used as the main materials of the hot melt copolymer. Adhesive and pressure-sensitive adhesives prepared by mixing the resin, wax and solvent in a weight ratio of 5 to 95%, respectively, according to the conditions are used.

At this time, rosin, ester, terpene resin, coumarone resin can be used as resin, and paraffin and microcrystalline wax can be used as wax.

Alternatively, dibutyl phthalate, diphenyl chloride and chlorinated paraffin may be used as plasticizers, calcium carbonate, a binder, talc and kaolin may be used as fillers, and para-alkyl phenols may be further added as antioxidants .

On the other hand, a UV curing agent may be used to form an adhesive or a pressure-sensitive adhesive layer and to improve adhesion and adhesion. In this case, the UV curing agent is added and dried and cured in a range of 1 to 8% of a generally used adhesive or adhesive.

At this time, when the pressure sensitive adhesive is silicone, the release film provided on the pressure sensitive adhesive layer is preferably coated with fluorine.

The adhesive strength of the pressure-sensitive adhesive is preferably about 30 g or more, and may be formed in an embossed shape.

The surface protection sheet according to the present invention can be variously processed according to the application form.

Specifically, in order to improve the flexibility, it is preferable that the thickness of each layer besides the perforations is in the order of the adhesive layer> the base film> the protective layer, and a special finishing treatment for preventing the edge portions of the surface protective paper from being cracked, The protective layer may cover the adhesive layer or the adhesive layer may cover the protective layer and it is preferable that the end portion is appropriately treated even when the surface protective paper is used adjacently.

Another aspect of the invention provides a method of making a surface protective paper.

According to the method, a method of manufacturing a surface protective paper includes a protective layer forming step;

An adhesive layer forming step of applying and drying an adhesive on the protective layer;

A base film forming step of forming a base film on the adhesive layer;

A pressure-sensitive adhesive layer forming step of forming an pressure-sensitive adhesive layer on the base film; And

And a release film forming step of forming a release film on the pressure-sensitive adhesive layer, and further comprising the step of punching a film containing the protective layer and / or the base film and the pressure-sensitive adhesive layer, if necessary .

At this time, the perforation is performed to impart flexibility to the surface protecting paper so that the surface protecting paper 100 can be bent along the curved surface of the adhered material, and air deflection can be reduced by reducing the adherence. The porosity is 10 to 70% .

The protective layer forming step is a step of laminating the leather, preferably artificial leather, more preferably Alcantara, as the main fabric and optionally auxiliary fabric, when the main fabric and the auxiliary fabric are included.

Also, when the auxiliary fabric is joined to the main fabric, the adhesive is applied to the primary fabric first to form the second adhesive layer, and the auxiliary fabric is interlocked, and then heated and pressed to form the flat lamination method, the roller lamination method and the hot press work. At this time, it is preferable to perform compression at a temperature in the range of 20 to 300 占 폚 and a pressure in the range of 5 to 110 MPa for 1 second to 3 minutes.

On the other hand, various functional layers can be added by coating pigments and pastes on the upper or lower surface of the protective layer. The method may further include forming the antistatic layer, the scratch-resistant coating layer, and the electromagnetic wave shielding layer selectively as described above.

In the step of forming an adhesive layer, the raw resin is mixed with a solvent on the lower surface of the protective layer to dissolve it, followed by stirring and aging, and then applying an adhesive to form a first adhesive layer, which includes coating, drying and curing.

The application of the adhesive can be carried out by spray coating, rotary screen process, roll coating process, plate coating process, fine precision coating process, UV coating process, "one stop roll to roll" A screen coating process, and a gravure coating process.

In addition, when applying the adhesive, it is preferable to maintain the room temperature at about 15 to 35 DEG C and the humidity at about 20 to 75%, and the relative humidity preferably ranges from 15 to 65%.

In drying and curing, the appropriate temperature and time are applied according to the material and the composition of the substrate film, the adhesive and the adhesive, and the curing or drying is performed by various drying methods such as a duct cone bare drying method, a hot air drying method, The drying process is performed to evaporate the solvent components in the adhesive or the adhesive so that only the respective raw material components are settled. In this case, it is preferable that the drying is performed at a temperature of 25 ° C to 300 ° C for 2 seconds to 95 minutes.

On the other hand, if the adhesive to be used is an acrylic adhesive, the temperature of the reactor should be set in the range of 25 to 125 ° C and the aging process should be performed in the range of 8 to 12 hours. If the hot melt adhesive is used, And the aging process is performed in the range of 12 to 15 hours.

The base film forming step is a step of forming a film formed on a lower surface of the adhesive layer, the film being formed of a material having an appropriate resistance value for temperature, strain, pressure, humidity, discoloration,

The pressure-sensitive adhesive layer-forming step is the same as the above-described adhesive-forming step, but is a step of forming a pressure-sensitive adhesive on the bottom surface of a substrate film by setting an appropriate mixing ratio of the raw resin and the solvent within the above- At this time, when the surface protective paper is removed from the adherend, it is preferable to treat the pressure sensitive adhesive layer in an embossed form in order to control the adhesive strength so as not to leave a residue on the surface.

The releasing film forming step is a step of forming a releasing film having a releasing layer on at least one side of a releasing paper on the lower surface of the pressure-sensitive adhesive layer. Preferably, the releasing layer has a thickness in the range of about 20 to 150 mu m.

Meanwhile, the surface protection sheet according to the present invention may further comprise a compression bonding step. The compression bonding step is performed after the release film forming step described above, and the produced surface protective paper is passed between the rollers and the rollers to form the surface protective paper with desired lint strength.

Yet another aspect of the present invention is,

A protective layer; A base film provided on the protective layer; A pressure-sensitive adhesive layer provided on the base film; And a release film provided on the pressure-sensitive adhesive layer, the method comprising the steps of: laminating a release film, a base film, an adhesive layer and a release film on a protective layer in the order of a release film, A method for producing a protective paper is provided.

In addition, it further comprises perforating the film comprising the protective layer, and / or the base film and the pressure-sensitive adhesive layer.

In this case, when the first adhesive layer is further provided between the protective layer and the base film, the first adhesive layer, the base film, and the adhesive layer may be further formed.

Another aspect of the present invention provides a method of using a surface protective paper.

The surface protection sheet according to the present invention can be easily used by the user. That is, the release film on the upper surface of the surface protective paper can be easily removed by removing the adhesive layer and attaching the exposed pressure-sensitive adhesive layer to a desired portion of the adherend. At this time, it is possible to attach the liquid material using the liquid material as a bonding agent according to convenience of the user. That is, after the release film is removed, the surface protective paper may be adhered to the adherend after the liquid material is applied to the adherend or the adhesive surface of the base film. Thereby, the strong adhesive force of the pressure-sensitive adhesive layer can be temporarily alleviated to prevent film deformation at the time of position adjustment and recrystallization. At this time, the liquid material to be used is a mixture of water and an additive, wherein 70 to 80% by weight of water and 20 to 30% of additive are used. The additive may be selected from a surfactant, isopropyl alcohol, or mixtures thereof.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

Claims (31)

A protective layer;
A base film provided on the protective layer;
A pressure-sensitive adhesive layer provided on the base film; And
And a releasing film provided on the pressure-sensitive adhesive layer. The method according to claim 1,
And a first adhesive layer is further provided between the protective layer and the base film. The method according to claim 1,
Wherein at least one of the protective layer, the first adhesive layer, the base film, the adhesive layer, and the release film is bored. The method of claim 3,
And a porosity of 10 to 70% at the time of perforation. The method according to claim 1,
Wherein the protective layer is composed of a main raw material alone or an auxiliary raw material is bonded to a surface of the main raw material and the main raw material facing the base film. 6. The method of claim 5,
And a second adhesive layer is included between the main fabric and the auxiliary fabric. 6. The method of claim 5,
Characterized in that the main fabric is made of leather. 6. The method of claim 5,
Wherein the thickness of the main fabric is 0.02 mm to 5 mm. 6. The method of claim 5,
Wherein the auxiliary fabric is one selected from the group consisting of PU, PVC, PET, PP, PE, non-woven fabric, paper, fiber and OPP. 8. The method of claim 7,
Characterized in that the leather is artificial leather. 11. The method of claim 10,
Characterized in that the artificial leather is of Alcantara. 6. The method of claim 5,
Characterized in that the thickness of the auxiliary fabric is between 10 μm and 300 μm. The method according to claim 1,
Wherein at least one surface of the protective layer further comprises at least one layer selected from the group consisting of an antistatic layer, a scratch-preventive coating layer, and an electromagnetic wave shielding layer. The method according to claim 1,
Wherein a surface on which the protective layer is exposed is further formed with a UV coating layer or a varnish layer. The method according to claim 1,
The material of the base film may be selected from the group consisting of polyurethane, polypropylene oxide, polyisocyanate, hydroxy ethyl, polyvinylchloride, polyethylene terephthalate (PET), monoacryl But are not limited to, mono acrylate, polyacrylate, poly methylmethacrylate, polycarbonate, polyethylene, methacryalte, polypropylene, cellulose (PVA), acrylate, propylene oxide, polypropylene, polyethylene, OPP (Oriented polypropylene), and the like. ), ≪ / RTI > PVC, and copolymers thereof. The method according to claim 1,
Wherein the releasing film is one surface of a release paper selected from the group consisting of paper, polypropylene, polyethylene terephthalate, OPP (Oriented Polypropylene), and PVC. . 17. The method of claim 16,
Wherein the release film is characterized in that the surface is coated with PE, silicon or fluorine in a thickness ranging from 2 to 150 mu m. 3. The method of claim 2,
Wherein the pressure sensitive adhesive and the adhesive used for the first adhesive layer and the pressure sensitive adhesive layer are of an emulsion type as silicone, acrylic, or hot melt adhesive and pressure sensitive adhesive. 19. The method of claim 18,
Wherein when the pressure-sensitive adhesive is silicon, the release film provided on the pressure-sensitive adhesive layer is coated with fluorine. 19. The method of claim 18,
Wherein the pressure-sensitive adhesive layer is formed in an embossed shape. Forming a protective layer;
An adhesive layer forming step of applying and drying an adhesive on the protective layer;
A base film forming step of forming a base film on the adhesive layer;
A pressure-sensitive adhesive layer forming step of forming an pressure-sensitive adhesive layer on the base film; And
And a release film forming step of forming a release film on the pressure-sensitive adhesive layer. 22. The method of claim 21,
Further comprising the step of punching at least one of the protective layer, the adhesive layer, the base film, the pressure-sensitive adhesive layer, and the release film. 22. The method of claim 21,
Wherein the step of forming the protective layer further comprises the step of applying an adhesive to the surface of the protective layer facing the adhesive layer and then lapping the auxiliary fabric. 24. The method of claim 23,
Wherein the temperature at the time of the lapping is in the range of 20 to 300 占 폚 and the pressure is in the range of 5 to 110 MPa. 22. The method of claim 21,
Further comprising a compression bonding step of passing the surface protective paper between the rollers and the rollers to form a desired thickness after the release film forming step. 22. The method of claim 21,
The formation of the adhesive and the pressure-sensitive adhesive may be carried out by various methods such as spray coating, rotary screen process, roll coating process, flat plate coating process, fine precision coating process, UV coating process, one- Wherein the method is carried out by one of the methods selected from the group consisting of a screen coating process, a PCB screen coating process, and a gravure coating process. A protective layer; A base film provided on the protective layer; A pressure-sensitive adhesive layer provided on the base film; And a release film provided on the pressure-sensitive adhesive layer, characterized in that it comprises the step of laminating a film produced in the order of a release film, a base film, a pressure-sensitive adhesive layer and a release film on a protective layer By weight based on the total weight of the surface protective paper. 28. The method of claim 27,
A step of punching at least one of the protective layer, the base film, the pressure-sensitive adhesive layer, and the release film. 28. The method of claim 27,
Further comprising the step of puncturing the first adhesive layer when the first adhesive layer is further provided between the protective layer and the base film. A method of using a surface protective paper according to any one of claims 1 to 20, wherein the release film of the surface protective paper is removed and adhered to the adherend. 31. The method of claim 30,
A method of using a surface protective sheet in which a liquid material is applied to an adherend or a substrate film adhering surface before adhering the surface protective paper from which the release film is removed to the adherend, and then adhered to the adherend.

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