KR20190087202A - Biaxially stretched polypropylene deco sheet film and method for manufacturing veneer using the same - Google Patents

Abstract

Disclosed are a biaxially stretched polypropylene decoration sheet film used in furniture and construction materials, and a patterned wood manufacturing method using same. The polypropylene decoration sheet comprises a protective film (200) which is capable of thermal bonding and a substrate film (300). The substrate film (300) comprises: a center layer (60) which is formed in a lower part of the protective film (200) and plays a role of a support layer maintaining a film shape; an upper surface layer (40) which is formed on an upper part of the center layer (60) and is selected from a group of a propylene homopolymer, propylene with one or more kinds of α-olefin copolymer (propylene content: 50-99 wt%), polyethylene or ethylene with one or more kinds of α-olefin copolymer (ethylene content: 30-95 wt%), ethylene with vinyl acetate (VA) copolymer (3-40 wt% of vinyl acetate content), and a mixture of the above mentioned materials; and a printing layer (30) which has a pattern printed on an upper part of the upper surface layer (40).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biaxially stretched polypropylene sheet,

The present invention relates to a biaxially stretched polypropylene deco sheet film excellent in processability in decolorizing a deco sheet film and a method for manufacturing a veneer using the same. More particularly, the present invention relates to a biaxially oriented polypropylene deco sheet film, The present invention relates to a biaxially oriented polypropylene deco sheet film having excellent processability that can be produced even in a PVC decorative sheet production facility by lowering the number of processing steps relative to a sheet, and a method for manufacturing a veneer using the same.

It is important to protect the printing surface when the decorative film is used on the outside of the furniture. However, even if the printing performance is raised to the maximum, the printed surface may be peeled off due to the impact of the surface, and scratches may be generated due to impact during processing and loading. With such a problem, the transparency film is adhered to the top of the printed polypropylene deco sheet film, thereby preventing the printed surface from being damaged by the impact.

The polypropylene protective film is eco-friendly because it does not emit any harmful substances, and its moisture barrier properties are superior to those of other materials. However, when used for bonding, the polypropylene protective film has a low surface resistance, There was a difficult problem. In order to solve such an adhesion problem, conventionally, a primer is applied to the bonding surface of the polypropylene film to modify the surface, and then the adhesive is adhered to the printing film. This method is disclosed in Korean Patent No. 10-0804826 B1, which discloses an olefin-based resin composition for a decorative sheet and a method for applying the same to a decorative sheet using the same. In Korean Patent No. 10-062294B1, a modified polyethylene resin and a polyurethane resin Discloses a method of adhering a print film and a protective film through thermal lamination. Also, Korean Patent Laid-Open Publication No. 10-2014-0007639 discloses a method of bonding a protective film and a printing film by applying a urethane adhesive, followed by hot pressing.

However, according to the preprocessing method and the bonding method of the polypropylene deco sheet described above, it is not limited to the use of the above-mentioned protective film made of polypropylene, and the adhesive strength, strength and durability are low, A pretreatment step of applying a primer to the rear surface of the film is required. In order to bond the pretreated protective film to the printed polypropylene deco sheet film, a separate adhesive applying step or a separate polyurethane resin or pre-coating step of a polyurethane mixed adhesive is essential. For adhesion between the protective film and the printing film, a primer is applied to the rear surface of the protective film, which is a conventional method, to give a certain surface adhesive force, and a polyurethane and a mixed adhesive or a separate adhesive Was applied to a film and a printed polypropylene deco sheet was adhered to produce a vignette. When the veneer is manufactured by the above-described conventional method, a separate pretreatment of the film is consumed. Further, there is a problem that separate adhesive application process, hot pressing, and volatilization of the solvent type adhesive are separately performed when the protective film and the print film are adhered.

In addition, Korean Patent No. 10-2011-0075774 discloses a polyolefin resin co-extruded on a stretched co-extruded film having a multiple adhesive layer in order to protect a printed layer on a paper, and then a polyolefin resin layer ) Is laminated and adhered to an object to be bonded by a thermal lamination method. Such a stretched coextruded film having a multiple adhesive layer is excellent in adhesion to paper, but has a problem that bonding is not achieved only by heat bonding with a printing decorative sheet composed of polypropylene.

Accordingly, an object of the present invention is to provide a biaxially stretched polypropylene deco sheet film which is free of surface treatment of a primer or the like, and can be laminated even by hot pressing only the protective film and the printed substrate film.

Another object of the present invention is to provide a veneer using an economical and productivity-improved biaxially oriented polypropylene deco sheet film.

In order to achieve the above object, the present invention provides a protective film (200) which can be thermally adhered and a center layer (60) formed below the protective film (200) Olefin copolymer (propylene content: 50 to 99% by weight), polyethylene or ethylene and one or more? -Olefin copolymer (ethylene content: 50 to 99% by weight), a propylene homopolymer, 30 to 95 percent by weight) or an ethylene / vinyl acetate (VA) copolymer (vinyl acetate content of 3 to 40 percent by weight), and mixtures thereof, and an upper portion of the upper surface layer 40 And a base film (300) including a printed layer (30) on which a pattern is printed.

The present invention also relates to a method of manufacturing a semiconductor device, comprising the steps of: preparing a heat-sealable protective film (200); a central layer (60) formed under the protective film (200) Olefin copolymer (propylene content: 50 to 99% by weight), polyethylene or ethylene and one or more? -Olefin copolymers (ethylene content: 30 to 90% by weight), a propylene homopolymer, 95% by weight) or an ethylene and vinyl acetate (VA) copolymer (vinyl acetate content of 3 to 40% by weight) and mixtures thereof and a top surface layer 40 on top of the top surface layer 40 The present invention relates to a process for producing a base film (300) by co-extruding a composition of a base film (300) including a printed layer (30) By printing the pattern Producing a biaxially stretched polypropylene deco sheet film including the protective film 200 by heating and pressing the base film 200 including the print layer 30 and the protective film 200 A step of laminating an adhesive layer 90 below the lower surface layer 80 of the polypropylene deco sheet film including the protective film and a step of laminating the plywood 100 with the biaxially stretched polypropylene deco sheet film in which the adhesive layer 90 is laminated And heating and pressing the same.

The biaxially stretched polypropylene deco sheet film according to the present invention can be manufactured by omitting the existing primer coating process, adhesive application process, solvent volatilization process and the like, simplifying the process, producing vignetting only through hot pressing (hot pressing) It is possible to produce a veneer using a biaxially stretched polypropylene deco sheet film which is economical and improved in productivity.

1 is a sectional view of a biaxially stretched polypropylene deco sheet film including a protective film for protecting a printing layer according to an embodiment of the present invention.
2 is an adhesive cross-sectional view of a biaxially stretched polypropylene deco sheet film and a plywood including a protective film according to another embodiment of the present invention.

In describing the present invention, the sizes and shapes of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. These terms are to be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the contents throughout the present specification.

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

1 is a view showing a cross-sectional structure of a biaxially stretched polypropylene deco sheet film including a protective film 200 for protecting a printing film according to an embodiment of the present invention. 1, a biaxially stretched polypropylene deco sheet film according to an embodiment of the present invention includes a protective film 200 capable of heat-shrinking and a base film 300 disposed under the protective film 200 And the protective film 200 and the base film 300 may be hot-pressed to form a propylene decoy sheet film.

The protective film 200 further includes an adhesive layer 20 for bonding the protective layer 10 and the print film 30. The base film 300 is composed of a printing layer 30, an upper surface layer 40 and a center layer 60 and further includes a lower surface layer 80, and the upper and lower surface layers 40, The intermediate layer 50 and the intermediate layer 60 between the upper surface layer 40 and the upper surface layer 40. The upper surface layer 40 may further include the printing film 30 and may have a three-layer structure or a five-layer structure or a multi-layer structure.

The protective film 200 is a film for protecting the print layer 30 printed on the biaxially stretched polypropylene deco sheet film, which is located on one side of the upper surface layer 40. The protective film 200 may be formed of a protective layer 10 including a polypropylene layer and a polyethylene layer and an adhesive layer composed of a solventless adhesive composed of ethylene vinyl acetate resin (EVA) alone or a mixture of ethylene vinyl acetate resin (EVA) 20). The protective layer 10 is a film formed by co-extruding polyethylene on one surface of a general BOPP film composed of polypropylene. An adhesive layer 20 is formed by laminating ethylene vinyl acetate resin (EVA) under the polyethylene layer of the protective layer 10 and adhered to the printed layer 30 of the biaxially stretched polypropylene deco sheet film by hot pressing. The opposite surface of the protective layer 10 on which the polyethylene is co-extruded may be composed of a resin selected from the group consisting of propylene resin, ethylene resin or propylene and ethylene polymer (ethylene content: 5 to 70% by weight) and mixtures thereof. Specifically, the polypropylene layer is selected from the group consisting of a propylene resin, an ethylene resin or an ethylene polymer (ethylene content: 5 to 70% by weight) and a mixture thereof, and the polyethylene layer is composed of an ethylene resin, (ethylene content: 30 to 95% by weight), ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl acetic acid copolymer and mixtures thereof .

The protective layer 10 is made of polypropylene resin. As a result, the adhesive ability between the protective layer 10 and the print layer 30 is reduced, and the biaxially stretched polypropylene deco sheet film is peeled off from the print layer 30. In order to solve such a problem, a primer is applied to the lower part of the protective layer 10 to improve the surface adhesive strength, and another adhesive 20 is applied to the printed layer 30 of the biaxially stretched polypropylene deco sheet film. However, in general, since the primer is diluted with an organic solvent-soluble solid component, the organic solvent may be exposed to the organic solvent when the primer is applied, and the organic solvent is impregnated in the film even after laminating. The organic solvent component used in the organic solvent remains.

In order to solve this problem, the present invention proposes a BOPP film (10) by co-extruding a conventional polypropylene resin with an ethylene resin, and laminating the ethylene vinyl acetate resin with an adhesive layer (20) to produce a protective film (200). As a result, the adhesion between the print layer and the BOPP film has been lowered so that the protective film 200 can be adhered to the print film 30 only through the hot pressing. Therefore, the steps of the conventional primer application process, adhesive application process, adhesive solvent volatilization process, and the like can be omitted, and the protective layer (30) of the protective film and the biaxially stretched polypropylene deco sheet film can be adhered to the protective film So that the workability is drastically improved.

The adhesive layer 20 is located below the protective film 200 and adheres to the print layer 30 of the biaxially stretched polypropylene deco sheet. More specifically, the protective film 200 can be laminated with the print layer 30 of the biaxially stretched polypropylene decolorate sheet by heat bonding (hot adhesion) by laminating ethylene vinyl acetate resin, laminated with a printed layer 30 of a biaxially stretched polypropylene deco sheet film by heat bonding (hot adhesion) with a printed layer 30 of a biaxially stretched polypropylene deco sheet film. The adhesive layer is made of an ethylene-vinyl acetate resin (EVA) alone or a blend of ethylene-vinyl acetate (EVA) and other blends, and a solventless adhesive as well as a solventless adhesive can be used. For example, vinyl acetate (PVA), latex, acryl, EVA, and the like. The adhesive has a thickness of 0.1 탆 to 5 탆, preferably 1 탆 to 2 탆. If the amount of the adhesive is too small, there is a problem of delamination, and if it is too much, there is a problem that the adhesive is released to the side surface. A protective film 200 featuring such a process and structure can be obtained.

The print layer 30 is formed by laminating printed or printed films on the upper surface layer 40 through a printing machine. (Laminated) an ethylene vinyl acetate resin (EVA) in order to increase the interlaminar adhesion of the biaxially stretched polypropylene deco sheet film including the print layer 30. [ A pattern is printed on the produced print layer 30 and the biaxially stretched polypropylene deco sheet film including the print layer 30 can be adhered to the protective film 200 only by hot pressing (hot pressing). The print layer 30 is a printable film that can be thermally laminated. The material of the upper surface layer 40 can be selected in consideration of the surface with the polyolefin resins and the printability in consideration of printability.

The upper surface layer 40 is disposed between the print layer 30 and the center layer 60 on one side of the center layer 60 and is exposed to the outside when the base film is produced. Smoothness, abrasion resistance, and the like. The composition of (40) comprises a propylene homopolymer, propylene and one or more alpha-olefin copolymer (propylene content: 50 to 99% by weight), polyethylene or ethylene and at least one alpha-olefin copolymer : 30 to 95% by weight) or ethylene vinyl acetate resin (EVA) (vinyl acetate content: 3 to 40% by weight), and mixtures thereof. (Ethylene content: 5 to 70% by weight) or ethylene vinyl acetate resin (EVA) (vinyl acetate content: 3 to 40% by weight), and mixtures thereof, preferably polyethylene, ethylene and one or more alpha -olefin copolymers And the like. Examples of the? -Olefin include ethylene, propylene, 1-butane, 1-pentene, 1-hexene, 1-methyl-1-pentene, 1-octene and 1-decene, Ethylene, propylene, 1-butene, 1-hexene, 1-methyl-1-pentene and 1-octene. The biaxially stretched polypropylene deco sheet film is a stretched coextruded film which can be thermally adhered to the upper surface layer 40 and is particularly excellent in adhesion to ethylene vinyl acetate resin (EVA) and has a protective film with an ethylene-vinyl acetate resin (EVA) And thermal lamination process. The melting point peak temperature of the composition of the upper surface layer 40 is 70 to 135 占 폚 and the melt index (ASTM D 1238, 190, 2.16 Kg) is 0.5 to 20.0.

The lower surface layer 80 is a layer that improves the surface adhesion force to the other surface of the center layer 60. The composition of the lower surface layer 80 may be a resin selected from the group consisting of a propylene homopolymer, a propylene -olefin copolymer (propylene content: 50 to 99% by weight) and a mixture thereof or a mixture of a polypropylene resin and a polyethylene resin And a MATTE compound composed of at least one compound selected from the group consisting of Examples of the? -Olefin include ethylene, 1-butene, 1-pentene, 1-hexene, 1-methyl-1-pentene, 1-octene and 1-decene, 1-butene, 1-hexene, 1-methyl-1-pentene and 1-octene. A primer is applied to the lower part of the lower surface layer 80 and a solvent type adhesive is applied to the upper part of the plywood when the veneer is manufactured to fix the decor sheet to the plywood.

The upper and lower surface layers 40 and 80 or both surface layers may be coated with an antioxidant, a UV stabilizer, a UV absorber, an antistatic agent, a lubricant, an antiblocking agent, a filler, an antifoggant, a plasticizer, And mixtures thereof. The additive is used in an amount of 0 to 30 parts by weight, preferably 0.1 to 20 parts by weight, more preferably 0.1 to 10 parts by weight, based on 100 parts by weight of the resin constituting the upper and lower surface layers 40 and 80. If the amount of the additive used is too small, the effect of using the additive can not be obtained. If the additive is too much, the physical properties of the surface layer may be lowered. Further, the surface treatment of the corona or the like can be performed according to the needs of the upper or lower surface layer 40, 80 or the surface layer on both sides, thereby providing additional features such as improvement in printing aptitude and improvement in adhesion, It may have a surface tension of 60 dyne / cm.

The core layer 60 serves as a support layer for maintaining the film form of the biaxially stretched polypropylene deco sheet film and contains an inorganic or organic additive that retains the shape of the particles that are not stretched when the propylene polymer resin is stretched and processed And density and hiding power can be controlled by controlling the content of inorganic or organic additives. The core layer 60 may be composed of a propylene polymer resin or dispersed inorganic or organic additives. The propylene polymer resin is a propylene polymer having a propylene content of 50 wt% or more. For example, it may be selected from the group consisting of propylene homopolymer, propylene and? -Olefin copolymer (propylene content: 50 to 99% by weight), and mixtures thereof, preferably propylene homopolymer. Wherein the propylene content refers to the weight of propylene units relative to the total polymer weight. The? -Olefin copolymerized with propylene may be, for example, ethylene, 1-butene, 1-pentene, 1-hexene, 1-methyl-1-pentene, , The? -Olefin imparts a function such as heat adhesion and adhesion to the propylene copolymer.

The inorganic or organic additive dispersed in the center layer 60 acts as an internal spacer when the propylene polymer resin is stretched to form pores or voids in the propylene polymer resin. That is, when the propylene polymer resin is stretched, a component that is not compatible with polypropylene and can not be stretched helps to form pores in the propylene polymer resin. The pore size and the density of the center layer 60 can be controlled according to the size and physical properties of the inorganic or organic additive and the hiding power of the center layer 60 can be controlled according to the refractive index difference of the center layer 60 components.

Examples of products that can be used as the inorganic additive include inorganic white pigments such as titanium dioxide, fillers, and the like. Specific examples of the filler include calcium carbonate (CaCO3), montmorillonite, bentonite, kaolinite, mica, hectorite, fluorohectorite, saponite a saponite, a saponite, a saponite, a beidelite, a nontronite, a stevensite, a vermiculite, a hallosite, a volkonskoite, a suconite, Magadite, kenyalite, and the like.

As the organic additive, a non-polypropylene organic polymer having a low compatibility with a propylene polymer may be used. Preferably, the organic additive is higher than the melting point of the propylene polymer (generally about 160 ° C), preferably 5 ° C or more, Has a melting point (Tm) of 10 占 폚 or more or a difference of 2 mN / m or more, preferably 3 mN / m or more, of surface tension (surface tension of polypropylene: about 30 to 31 mN / m) / m or more, and more preferably 5 mN / m or more.

Examples of the synthetic resin which is an organic additive include polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polymethylmethacrylate (PMMA), polybutylene terephthalate Polyamide (Nylon, 4/6, 6/6, 6/10, 6), polyethylene terephthalate (PET), polyethylene terephthalate (PET) -elastomer, polyester copolymer (PET- (PPS), polymethylpentane (PMP), polyimide (PI), mixtures thereof, and the like.

An organic white pigment, an antioxidant, an antistatic agent, a lubricant, an anti-blocking agent, an antifogging agent, and a plasticizer may be used to further enhance the effects of the inorganic white pigment and the filler.

The inorganic additive may be incorporated into the propylene polymer resin in the form of a master batch (M / B) of propylene polymer. The amount of the inorganic additive to be used is 1 to 60 parts by weight, preferably 2 to 50 parts by weight, more preferably 5 to 40 parts by weight, based on 100 parts by weight of the propylene polymer resin. If the amount of the inorganic additive used is too small, the density of the biaxially stretched polypropylene deco sheet film can not be sufficiently controlled because the pores are insufficiently formed in the center layer 60. If the amount of the inorganic additive is too large, 60 may be insufficient in strength. The particle size of the inorganic additive is usually from 0.1 to 30 mu m, preferably from 0.1 to 15 mu m, more preferably from 0.1 to 10 mu m. If the particle size of the inorganic additive is too small, a sufficient size of pores may not be formed. If the particle size is too large, the pore size may become excessively large, and the strength of the center layer 60 may be lowered.

If necessary, the organic modifier may be added to the center layer 60 to further control the compatibility and the pore size of the inorganic additive and the propylene polymer resin. On the contrary, if pores are not required in the center layer 60, The film can be produced only with the pigment without the additive. Examples of organic modifiers that increase the compatibility of the inorganic additive with the propylene polymer resin include ethylene-ethyl acrylate (EEA), polyethylene grafted maleic anhydride (PE-g-MA), polypropylene grafted maleic anhydride (PP-g-MA ), Ethylene-propylene rubber graft maleic anhydride (EPR-g-MA), ethylene-octene rubber graft maleic anhydride (EOR-g-MA), ethylene-propylene-diene monomer rubber graft maleic anhydride (EPDM- (EP-g-MA), polyethylene-grafted acrylic acid (PE-g-AA), ethylene-propylene rubber grafted acrylic acid (EPR-g-AA), ethylene-octene rubber grafted maleic anhydride Rubber graft acrylic acid (EPDM-g-AA), mixtures thereof, and the like. The amount of the organic modifier is 0.1 to 10 parts by weight, preferably 0.1 to 5 parts by weight, based on 100 parts by weight of the propylene polymer resin. If the amount of the organic modifier is too small, the effect of improving the compatibility is insignificant. If the amount is too large, the physical properties of the center layer 60 may be lowered without any special benefit.

The intermediate layers 50 and 70 have characteristics that further assist the characteristics such as the hiding power and the thickness shortage which are insufficient only by the surface layers 40 and 80 and the center layer 60. [ In addition, it may contain an inorganic or organic additive that maintains a non-stretched particle form, and the density and hiding power can be controlled by controlling the content of the inorganic or organic additive. The intermediate layers 50 and 70 may have the same components as the surface layer 40 or 80 or the center layer 60 and may form a complementary structure. When the polypropylene deco sheet film is formed into a three-layer structure, the polypropylene decolorate film may not be present. When the polypropylene deco sheet film is formed into a multi-layer structure of three or more layers, an inorganic whiteness such as titanium dioxide Pigments, organic white pigments, antioxidants, antistatic agents, lubricants, anti-blocking agents, fillers, antifogging agents, plasticizers and the like. As the resin composition of the intermediate layer (50, 70). A propylene homopolymer, a propylene? -Olefin copolymer, a copolymer resin using three or more? -Olefins, and a mixture thereof. The copolymerized? -Olefin may be, for example, ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 1-methyl-1-pentene, .

The adhesive layer 90 is a layer for facilitating adhesion between the biaxially stretched polypropylene deco sheet film and the plywood. More specifically, a hot-melt laminate may be laminated on the lower surface layer 80, and the laminated wood may be formed by heat bonding with a laminate such as MDF or PB. Examples of the solventless adhesive include ethylene-vinyl acetate (EVA), thermoplastic polyurethane (TPU), polyethylene (PE), polypropylene (PP), and one- or two-component reactive urethane adhesive (PU). Further, not only the solvent-free adhesive, but also conventional solvent-based adhesives can be used. For example, vinyl acetate (PVA), latex, acryl, EVA, and the like. The amount of the adhesive used is 1 탆 to 200 탆, preferably 2 탆 to 100 탆. If the amount of the adhesive is too small, there is a problem of delamination, and if it is too much, there is a problem that the adhesive is released to the side surface.

The total thickness of the biaxially stretched polypropylene deco sheet film composed of the print layer 30, the upper surface layer 40, the center layer 60, the lower surface layer 80 and the intermediate layers 50, But it is usually 20 to 500 탆 in consideration of productivity, price competitiveness, physical properties and the like. In the present invention, the thickness of the center layer 60 is usually at least 50%, preferably at least 60%, more preferably at least 70% of the thickness of the entire biaxially stretched polypropylene decocheet film. If the thickness of the center layer 60 is too thin, it may be difficult to form a biaxially stretched polypropylene deco sheet film in the course of extrusion and stretching. The thickness of the surface layer 40 and the intermediate layers 50 and 70 can be freely adjusted according to the application and design of the product. However, considering the hiding power control, printing suitability, heat resistance, etc., The thickness of the intermediate layer 50 is in the range of 0.1 to 40%, preferably 0.5 to 25% It has a thickness of 30%. The thickness of the printing layer 30 is usually 1 占 퐉 or less. Further, the thickness of the adhesive layer 90 is usually 5 to 400%, preferably 10 to 120% of the thickness of the center layer 30. The upper and lower surface layers 40 and 80, the intermediate layers 50 and 70 and the center layer 60 may be formed in a multilayer structure such as a two-layer structure or a three-layer structure as well as a single layer depending on functions and applications. Therefore, the biaxially stretched polypropylene deco sheet film according to the present invention has a minimum number of three-layered multi-layered structure, and may have a multi-layered structure having five or more layers according to the design. The thickness of the protective film 200 is 10 to 200% of the thickness of the biaxially stretched polypropylene deco sheet. And preferably 20 to 120%. The adhesive layer 20 located under the protective film 200 has a thickness of 30 to 80% of the thickness of the entire protective film 200.

The biaxially stretched polypropylene deco sheet film according to the present invention melts each resin component in different extruders. The molten resin may be co-extruded in the form of a laminated polypropylene sheet, and then stretched to produce a film for a polypropylene deco sheet. Specifically, the resin composition for the center layer 60, the resin composition for the upper and lower surface layers 40 and 80 and, if necessary, the resin composition for the intermediate layer 50 and 70 are melted and kneaded with an extruder to form the upper surface layer 40, a middle layer 50, a middle layer 60, an intermediate layer 70 and a lower surface layer 80 are sequentially laminated is formed in a T-die and formed into a single sheet The base film 300 is produced by co-extrusion, and is stretched to produce a biaxially stretched polypropylene deco sheet film according to the present invention. The film laminate may form biaxially oriented polypropylene (BOPP) in the machine direction and the transverse direction. The print film 30 is manufactured by printing patterns with a printing machine on the upper surface layer 40 of the base film and the base film 300 and the protective film 200 are heated and pressed to form a poly A propylene deco sheet film can be produced. A primer is applied to the lower part of the lower surface layer 80 of the polypropylene deco sheet film including the protective film 200, and then the adhesive layer 90 is laminated and heat-pressed with the plywood 100.

The veneer produced by this patent is shown in more detail in FIG. 2 is a view showing a bonded cross-sectional structure of a biaxially stretched polypropylene deco sheet film and a plywood sheet including a protective film according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

[Example 1] Production of biaxially stretched polypropylene deco sheet film containing a protective film

The resins having the compositions shown in Table 1 were put in different extruders and melted. The melted resin was co-extruded with a T-die to form a sheet. The sheet thus formed was cooled and stretched 5 times in the machine direction and 9.5 times in the width direction to obtain five layers of a white opaque film in the form of a biaxially stretched film A structure biaxially stretched polypropylene deco sheet (60 탆) was prepared. Then, the protective film 10 was produced by laminating ethylene vinyl acetate resin to the lower part of the film where the propylene resin and the ethylene resin were co-extruded. The protective films 10 and 20 were thermally adhered to the print layer 30 of the biaxially stretched polypropylene deco sheet film. Through this process, a printed decolor sheet having a print layer 30 composed of a total of 90 탆 composed of a print film 60 탆 and a protective film 30 탆 was produced. The results of evaluation of the physical properties of the biaxially stretched polypropylene deco sheet film prepared in the above Examples and the evaluation results of the adhesion between the films are shown in Table 7 below.

division layer
Resin and composition used thickness
(탆) Example 1






Protective film

Protective layer
(1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt% 20
(1) Polyethylene resin (melting temperature: 124 DEG C) 100 wt% Adhesive layer (1) EVA (melting temperature: 83 DEG C) 100 wt% 10 Base film



Upper surface layer (1) EVA (melting temperature: 83 DEG C) 100 wt% 3 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Center layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 48 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Lower surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3

[Example 2] Production of biaxially stretched polypropylene deco sheet film containing a protective film

Except for the resin having the composition shown in Table 2 below. The evaluation results of the property evaluation results of the biaxially stretched polypropylene deco sheet films produced in the same manner as in the above Examples and the adhesion between the films are shown in Table 7 below.

division layer
Resin and composition used thickness
(탆) Example 2






Protective film

Protective layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt% 20 (1) LLDPE (melting temperature: 124 DEG C) 100 wt% Adhesive layer (1) EVA (melting temperature: 83 DEG C) 100 wt% 10 Base film



Upper surface layer (1) EVA (melting temperature: 83 DEG C) 100 wt%
(2) LDPE (melting temperature: 105 DEG C) 100 wt% 3 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt% 3 Center layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 48 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Lower surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3

[Example 3] Production of biaxially stretched polypropylene deco sheet film including a protective film

Except for the resin having the composition shown in Table 3 below. The evaluation results of the property evaluation results of the biaxially stretched polypropylene deco sheet films produced in the same manner as in the above Examples and the adhesion between the films are shown in Table 7 below.

division layer
Resin and composition used thickness
(탆) Example 3






Protective film

Protective layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt% 20 (1) LLDPE (melting temperature: 124 DEG C) 100 wt% Adhesive layer (1) EVA (melting temperature: 83 DEG C) 100 wt% 10 Base film



Upper surface layer (1) LDPE (melting temperature: 105 DEG C) 100 wt% 3 Middle layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt% 3 Center layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 48 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Lower surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3

[Comparative Example 1] Production of biaxially stretched polypropylene deco sheet film containing a protective film

As shown in the following Table 4, an acrylic primer was applied to the existing polypropylene protective film and the surface of the print film, and EVA type solvent type adhesive was applied therebetween to bond the two films. A five-layered biaxially stretched polypropylene deco sheet film was prepared and used in the same manner as in the above examples. The thickness of the printed film was set to 60 탆 in the same manner as the film of the example, and the thickness of the protective film was the same And the total thickness of the decor sheet layer was 90 탆. The thickness of the primer layer and the adhesive layer, which are composed of a liquid, varies depending on the time or distribution of drying depending on the application site. The evaluation results of the property evaluation results of the biaxially stretched polypropylene deco sheet films produced in the same manner as in the above Examples and the adhesion between the films are shown in Table 7 below.

division layer
Resin and composition used thickness
(탆) Comparative Example
One





protect
film Protective layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt% 30 Primer layer (1) Acrylic primer (surface treatment layer) 1 to 2 glue Adhesive layer (1) EVA type solvent-based adhesive agent 6 to 8 materials
film
Primer layer (2) Acrylic primer (surface treatment layer) 1 to 2 Upper surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Center layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 48 Middle layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Lower surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3

[Comparative Example 2] Production of biaxially stretched polypropylene deco sheet film including a protective film

As shown in the following Table 5, a print film of a conventional synthetic paper structure without applying an acrylic primer was formed on the polypropylene protective film used in Examples and the base film of the printing film used in Comparative Example 1, and heat-laminated. The thickness of the print film was set to 60 탆 in the same manner as the film of the example, and the thickness of the protective film was set to 30 탆 in the same manner as the example, and the thickness of the entire decor sheet was 90 탆. The evaluation results of the property evaluation results of the biaxially stretched polypropylene deco sheet films produced in the same manner as in the above Examples and the adhesion between the films are shown in Table 7 below.

division layer
Resin and composition used thickness
(탆) Comparative Example 2






Protective film

Protective layer (1) Polypropylene resin (melting temperature: 157 占 폚) 85 wt% 20 (1) LLDPE (melting temperature: 124 DEG C) 100 wt% Adhesive layer (1) EVA (melting temperature: 83 DEG C) 100 wt% 10 Base film



Upper surface layer (1) Propylene and? -Olefin copolymer (melting temperature: 125 ° C) 100 wt% 3 Middle layer (1) Propylene resin (melting temperature: 157 DEG C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Center layer (1) Propylene resin (melting temperature: 157 DEG C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 48 Middle layer (1) Propylene resin (melting temperature: 157 DEG C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Lower surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3

[Comparative Example 3] Production of biaxially stretched polypropylene deco sheet film without protective film

As shown in Table 6 below, the polypropylene protective film used in the Examples was not used, and the acrylic primer was applied to the base film of the printing film used in Comparative Example 1, Respectively. The thickness of the printed film was set to 60 탆 in the same manner as the film of the example. The evaluation results of evaluation of physical properties of the biaxially stretched polypropylene deco sheet film prepared in the same manner as in the above Examples are shown in Table 7 below.

division
layer Resin and composition used thickness
(탆) Comparative Example 3




materials
film
Primer layer (1) Acrylic primer (surface treatment layer) 1 to 2 Upper surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3 Middle layer (1) Propylene resin (melting temperature: 157 DEG C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Center layer (1) Propylene resin (melting temperature: 157 DEG C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 48 Middle layer (1) Propylene resin (melting temperature: 157 DEG C) 85 wt%
(2) 50 wt% of titanium dioxide (TiO2) Master Batch 10 wt%
(3) 70% by weight of calcium carbonate (CaCO3) Master Batch 5% 3 Lower surface layer (1) Propylene and an? -Olefin copolymer (melting temperature: 125 ° C) of 100 wt% 3

The evaluation results of the properties of the decorative sheet of Examples and Comparative Examples described above and the evaluation results of adhesion strength between the films are shown in Table 7 below.

division density
(g / cm3) Transmittance
(%) Adhesion between films
(Hot adhesion 110 to 120) Pencil hardness
(Load: 0.3, angle: 45 degrees) Example 1 0.85 15 Adhesion Good 2H Example 2 0.85 15 Adhesion Good 2H Example 3 0.85 15 Adhesion Good 2H Comparative Example 1 0.85 15 Adhesion Good 2H Comparative Example 2 0.85 15 Poor adhesion 2H Comparative Example 3 0.80 17 - HB

The densities of the biaxially stretched polypropylene deco sheet films produced by the examples and the comparative examples were measured using ASTM D 1505. As shown in Table 5, when an inorganic additive is used, micro voids are formed inside the stretching process, thereby lowering the density of the biaxially stretched polypropylene deco sheet film.

Transmittance was evaluated in order to evaluate the hiding power of the biaxially stretched polypropylene deco sheet film, and the transmittance was measured according to ASTM D 1003, and the results are shown in Table 5 below. As shown in Table 7, when a void is formed using an inorganic additive, the difference in refractive index between the air gap surface and the resin surface is increased, whereby the transmittance is lowered and the hiding power is improved. When the protective film is used, it can be observed that the hiding power is slightly increased. The protective film and the base film were hot-pressed at a temperature of 110 to 120 ° C., and the adhesion strength of the protective film and the base film were directly measured and evaluated. The film was torn on the protective film and the base film adhesion portion.

In addition, pencil hardness was determined by fixing pencils with a load of 0.3 kg and an angle of 45 degrees, and scratching the examples and the comparative examples by pencil hardness and visually. Compared with the result of measurement of pencil hardness without a protective film and generally below H, it can be seen that scratch resistance in the surface is increased due to the protective film.

By comparing Examples and Comparative Examples in Table 7, it was confirmed that the polypropylene deco sheet film produced by the production method of the present invention had the same physical properties and adhesive force as the polypropylene deco sheet film prepared by the conventional production method. This makes it possible to obtain a polypropylene deco sheet film of good physical properties without omitting the conventional process steps, and it is possible to produce a veneer having economic and improved productivity through a simplified process.

Claims (13)

A protective film (200) capable of thermal adhesion; And
A core layer 60 formed on the lower side of the protective film 200 and serving as a supporting layer for maintaining a film form, a propylene homopolymer, a propylene homopolymer, Olefin copolymer (ethylene content: 30 to 95% by weight) or ethylene and vinyl acetate (VA) copolymer (content of vinyl acetate (ethylene content: 50 to 99% by weight) 3 to 40% by weight), and a mixture thereof; and a printed layer (30) printed on the top of the upper surface layer (40); ≪ / RTI > The method of claim 1, wherein the protective film (200) comprises a propylene resin, an ethylene resin or a polypropylene layer selected from the group consisting of propylene and an ethylene polymer (ethylene content: 5 to 70% (Ethylene content: 30 to 95% by weight), ethylene / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl acetic acid copolymer, and mixtures thereof (20) composed of a protective layer (10) comprising a polyethylene layer selected from the group consisting of ethylene vinyl acetate resin (EVA) alone or a solventless adhesive composed of ethylene vinyl acetate resin (EVA) , Polypropylene deco sheet film. The method of claim 1, wherein the base film (300) further comprises a lower surface layer (80), the lower surface layer (80) is formed on the other surface of the center layer (60), and the propylene homopolymer, Olefin copolymer (propylene content: 50 to 99% by weight) and a mixture thereof, or a MATTE compound composed of a mixture of a polypropylene resin and a polyethylene resin. film. The propellant according to claim 1, wherein the center layer (60) serves as a supporting layer for maintaining a film form, and is made of a propylene homopolymer, a copolymer of propylene and an -olefin (propylene content: 50 to 99% Lt; RTI ID = 0.0 > 1, < / RTI > The polypropylene deco sheet film according to claim 1, wherein the printing layer (30) is printed with a pattern by a printing machine. The composition of claim 1 wherein the top surface layer (40) composition has a melting peak temperature of 70 to 135 and a melt index (ASTM D 1238, 190, 2.16 Kg) of from 0.5 to 20.0. film. The polypropylene deco sheet film of claim 1, wherein the base film (300) further comprises an adhesive layer (90) formed under the lower surface layer (80) and adhered to the plywood (100). The method of claim 3, further comprising an intermediate layer (50,70) formed between the upper and lower surface layers (40,80) and the center layer (60,70) And a copolymer of? -Olefin (propylene content: 50 to 99% by weight) and a mixture thereof. 9. The method of claim 8, wherein the center layer (60) and the intermediate layers (50, 70) each comprise an inorganic or organic additive that maintains a non-stretchable particle form, and the inorganic additive is an inorganic filler comprising titanium dioxide A white pigment and a colorant such as calcium carbonate (CaCO3), montmorillonite, bentonite, kaolinite, mica, hectorite, fluorohectorite, saponite, Beidelite, nontronite, stevensite, vermiculite, hallosite, volkonskoite, suconite, magadite, (PS), an acrylonitrile-butadiene-styrene copolymer (ABS), a polycarbonate (PC), a polymethyl methacrylate (PC) (PMMA), polybutylene terephthalate (PBT), polyamide (Nylon, 4/6, 6/6, 6/10, 6), polyethylene terephthalate (PET), polyethylene terephthalate (PET) Wherein the inorganic or organic additive is a synthetic resin comprising an elastomer, a polyester copolymer (PET-G), polyphenylsulfite (PPS), polymethylpentane (PMP), polyimide (PI) Is 1 to 60 parts by weight per 100 parts by weight of the propylene polymer in the center layer (60) and the intermediate layers (50, 70). The composition according to claim 1, further comprising additives such as antioxidants, UV stabilizers, UV absorbers, antistatic agents, lubricants, anti-blocking agents, fillers, antifogging agents, plasticizers, compatibilizers, Sheet film. The adhesive layer (20) according to claim 3, wherein the thickness of the center layer (60) is 20 to 200 占 퐉, the thickness of the protective film (200) The thickness of the upper surface layer 40 is 0.1 to 30% of the thickness of the center layer 60 and the lower surface layer 80 is a thickness of the center layer 60 Is 0.1 to 30% of the thickness of the polypropylene sheet. A step of producing a heat-sealable protective film (200);
A core layer 60 formed on the lower side of the protective film 200 and serving as a supporting layer for maintaining a film form, a propylene homopolymer, a propylene homopolymer, Olefin copolymer (ethylene content: 30 to 95% by weight) or ethylene and vinyl acetate (VA) copolymer (content of vinyl acetate (ethylene content: 50 to 99% by weight) (30) comprising a top surface layer (40) selected from the group consisting of a top layer (40) and a printing layer (30) printed on top of the top surface layer (40) Coextruding the base film 300 in a sheet form to produce a base film 300;
Printing a pattern on a top surface layer (40) of the base film (300) with a printing machine to produce a printing layer (30);
(B) heating the base film (200) including the print layer (30) and the protective film (200) to produce a biaxially stretched polypropylene deco sheet film including the protective film (200);
Laminating an adhesive layer (90) under the lower surface layer (80) of the polypropylene deco sheet film containing the protective film; And
And heat-pressing the plywood (100) with the biaxially stretched polypropylene deco sheet film in which the adhesive layer (90) is laminated. The method according to claim 13, wherein the print layer (30) is printed with a pattern by a printing machine.

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