KR20190095674A - Building material and method for manufacturing the same - Google Patents

Building material and method for manufacturing the same Download PDF

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Publication number
KR20190095674A
KR20190095674A KR1020180014952A KR20180014952A KR20190095674A KR 20190095674 A KR20190095674 A KR 20190095674A KR 1020180014952 A KR1020180014952 A KR 1020180014952A KR 20180014952 A KR20180014952 A KR 20180014952A KR 20190095674 A KR20190095674 A KR 20190095674A
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KR
South Korea
Prior art keywords
layer
synthetic resin
building
uneven
adhesive
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Application number
KR1020180014952A
Other languages
Korean (ko)
Inventor
심응문
심대용
Original Assignee
주식회사 멜텍
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Priority to KR1020180014952A priority Critical patent/KR20190095674A/en
Publication of KR20190095674A publication Critical patent/KR20190095674A/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/08Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/02Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/06Embossing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04Interconnection of layers
    • B32B7/12Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/10Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products
    • E04C2/24Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of wood, fibres, chips, vegetable stems, or the like; of plastics; of foamed products laminated and composed of materials covered by two or more of groups E04C2/12, E04C2/16, E04C2/20
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2419/00Buildings or parts thereof

Abstract

The present invention relates to a building material, wherein the building material includes a synthetic resin layer containing a synthetic resin, an adhesive layer located on the uneven surface of the synthetic resin layer, and a surface layer located on the adhesive layer.

Description

BUILDING MATERIAL AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a building material and a manufacturing method thereof.

The flooring material, especially flooring flooring, which is widely known as one of the building materials in the related art, is made of a plywood layer using plywood manufactured using veneer as a base layer, and a veneer layer is formed by laminating veneer using adhesive thereon. It was completed by surface coating treatment.

As such, when the material of the base material layer is made of wood such as plywood, the natural feeling is excellent, but the moisture of the floor is directly transferred to the plywood, and the base material layer is rotted and warped when used for a long time.

In addition, in the case of plywood, the thermal conductivity is low, in the case of the floor of the ondol method, a lot of time and energy is consumed to increase the temperature due to a lot of heat loss, and the specific gravity of the wood is low, so the effect of sound insulation or sound insulation is greatly reduced.

In addition, the use of scratches or crushing phenomenon is easy to occur during use, so the surface damage or breakage of the flooring material is high and the user's satisfaction decreases.

Republic of Korea Patent No. 10-0537541 (Registration date: December 12, 2005, the name of the invention: flooring material having a veneer and synthetic resin layer using a symmetrical structure and its manufacturing method) Republic of Korea Patent No. 10-0696119 (Registration Date: March 12, 2007, Name of the invention: flooring material including a surface layer and wood-based board using a synthetic resin)

The problem to be solved by the present invention is to improve the function of the building material.

Another problem to be solved by the present invention is to improve the satisfaction of users using building materials.

The building material of the present invention for solving the above problems includes a synthetic resin layer containing a synthetic resin, an adhesive layer located on the uneven surface of the synthetic resin layer, and a surface layer located on the adhesive layer.

The synthetic resin is a group consisting of vinyl chloride resin, polyethylene, polypropylene, polyethylene terephthalate, high impact polystyrene, acrylonitrile-butadiene-styrene, polyurethane, styrene-butadiene-styrene and styrene-ethylene-butadiene-styrene block copolymers Can be selected from one or more.

The synthetic resin layer may further contain at least one of stone powder, jade, ocher and glass fibers.

The surface layer may be a veneer layer or a high pressure melamine laminate (HPL) layer.

When the surface layer is a thermosetting resin high pressure decorative plate layer, the surface of the thermosetting resin high pressure decorative plate layer in contact with the adhesive layer may be an uneven surface.

The adhesive layer may be made of kraft paper or an adhesive.

According to another aspect of the present invention, a method of manufacturing a building material includes forming an uneven surface on an upper surface of a synthetic resin layer containing a synthetic resin to form the upper surface as an uneven surface, and a resin-impregnated kraft paper on the uneven surface of the synthetic resin layer. Positioning, forming a veneer on the resin-impregnated kraft paper, and adhering the veneer to the uneven surface of the synthetic resin layer to form a surface layer on the synthetic resin layer.

According to another aspect of the present invention, a method of manufacturing a building material includes forming an uneven surface on an upper surface of a synthetic resin layer containing a synthetic resin to form the upper surface as an uneven surface, and applying an adhesive on the uneven surface of the synthetic resin layer. Forming a surface layer on the synthetic resin layer by attaching a thermosetting resin high pressure melamine laminate (HPL) onto the adhesive, and adhering the thermosetting resin high pressure cosmetic plate to the uneven surface of the synthetic resin layer. Steps.

The thermosetting resin high pressure decorative plate may include a core layer made of kraft paper, a print layer positioned on the core layer, and an overlay layer positioned on the printed layer, and the method of manufacturing a building material according to the above feature is located on the adhesive. Before the step, the step of forming the irregularities on the surface of the core layer located in the adhesive may further comprise the step of making the surface irregularities.

The synthetic resin is a group consisting of vinyl chloride resin, polyethylene, polypropylene, polyethylene terephthalate, high impact polystyrene, acrylonitrile-butadiene-styrene, polyurethane, styrene-butadiene-styrene and styrene-ethylene-butadiene-styrene block copolymers Can be selected from one or more.

The synthetic resin layer may further contain at least one of stone powder, jade, ocher and glass fibers.

The uneven surface forming step may form the uneven surface by using a sanding method using a sander, a sand blast method, or a corona process.

The surface layer forming step may be performed by a thermocompression process.

The surface layer forming step may be performed by a cold pressing process.

According to a feature of the present invention, since the base material layer of the building material is made of a synthetic resin layer, the base layer is prevented from being rotted or warped due to moisture, thereby extending the life of the building material.

In addition, the surface layer is bonded to the uneven surface of the synthetic resin layer, the adhesion of the surface layer is improved due to the increase in the adhesion area.

When the surface layer is bonded onto the synthetic resin layer by using the resin-impregnated kraft paper, the adhesive force is further improved because the resin-impregnated kraft paper contains the resin component in the same way as the base layer.

When the surface layer is made of a thermosetting resin high pressure makeup plate (HPL), since the surface of the thermosetting resin high pressure makeup plate is uneven and adhered to the synthetic resin layer, the adhesion of the surface layer is further increased.

1 is a cross-sectional view of a building material according to an embodiment of the present invention.
2A through 2C are views sequentially illustrating a manufacturing process of a building material according to an embodiment of the present invention.
3 is a cross-sectional view of a building material according to another embodiment of the present invention.
4 (a) to (c) is a view sequentially showing a manufacturing process of a building material according to an embodiment of the invention.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In describing the present invention, if it is determined that adding specific descriptions of techniques or configurations already known in the art may make the gist of the present invention unclear, some of them will be omitted from the detailed description. In addition, terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to related persons or customs in the art. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” specifies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Hereinafter, with reference to the accompanying drawings will be described for a building material and a manufacturing method according to an embodiment of the present invention.

First, with reference to FIG. 1, a building material according to an embodiment of the present invention will be described.

As shown in Figure 1, the building material 100 according to an embodiment of the present invention is a synthetic resin layer 110, the adhesive layer 120 and the adhesive layer 120 made of kraft paper located on the synthetic resin layer 110 The veneer layer 130 is provided.

The synthetic resin layer 110 is a layer made of synthetic resin, and forms a base layer of the building material 100 of the present example.

Synthetic resins include polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), high impact polystyrene (HIPS), acrylic Acrylonitrile-butadiene-styrene (ABS), polyurethane (PU), styrene-butadiene-styrene (SBS) and styrene-ethylene-butadiene-styrene block copolymers ( styrene-ethylenebutadiene-styrene block copolymer, SEBS) may be selected from one or more.

As such, since the base layer is made of a synthetic resin resistant to moisture, when the base layer is prevented from rotting due to moisture, the base layer is prevented from being warped due to moisture.

The synthetic resin layer 100 may contain at least one of powder (ie, stone powder), jade, loess, wood powder, and glass fiber of stone such as elvan. As the functional material such as stone powder, jade or loess is contained in the synthetic resin layer 100, effects such as antimicrobial activity, far-infrared emission or strength increase occur.

One surface of the synthetic resin layer 110, that is, the upper surface in contact with the adhesive layer 120 has an uneven surface, and the lower surface of the synthetic resin layer 110 positioned on one side of the synthetic resin layer 110 has a flat surface.

Therefore, the surface area of the synthetic resin layer 110 in contact with the adhesive layer 120 is increased to increase the adhesive force of the adhesive layer 120.

The adhesive layer 120 may be made of kraft paper such as resin impregnated kraft paper impregnated with a thermosetting resin such as a phenol resin for a predetermined time.

The veneer layer 130 is for expressing a beautiful appearance and is formed by using a veneer cut to a predetermined thickness of solid wood having a beautiful pattern.

At this time, to place the veneer on the synthetic resin layer 110 and then to adhere the veneer on the synthetic resin layer 110 to form the veneer layer 130, kraft paper melts by a thermocompression bonding process to act as an adhesive.

As described above, the adhesive layer 120 is a layer in which the resin-impregnated kraft paper is impregnated with the thermosetting resin, and since the resin component is contained in both the kraft paper and the synthetic resin layer 110 during the heat treatment operation, the veneer on the synthetic resin layer 110 is easy. By bonding to form a veneer layer 130.

The manufacturing method of such a building material 100 is as follows.

First, as shown in FIG. 2A, irregularities are formed on an upper surface of one surface of the synthetic resin layer 110 so that the upper surface has an uneven surface.

Next, as shown in FIG. 2B, a resin impregnation kraft paper 20 is placed on the uneven surface, which is the upper surface of the synthetic resin layer 110, and as shown in FIG. 2C, the kraft paper ( 20) place the veneer 30 above.

The thermocompression process is performed on the kraft paper 20 and the veneer 30 which are located on the synthetic resin layer 110 (FIG. 2c), and the veneer 30 is adhered to the uneven surface of the synthetic resin layer 110 on the synthetic resin layer 110. The veneer veneer layer 130 is formed.

The thermocompression process may be carried out at a temperature of 100 ° C. to 120 ° C., a pressure of 10 ± 2 kg / cm 2, and for 10 to 30 minutes.

By the heat applied in this thermocompression process, the resin impregnated kraft paper 20 melts and acts as an adhesive between the synthetic resin layer 110 and the veneer 30.

At this time, since the resin-impregnated kraft paper 20 contains a resin component like the synthetic resin layer 110, the adhesive force with the synthetic resin layer 110 increases.

Therefore, the veneer 30 is adhered to the upper surface of the uneven surface of the synthetic resin layer 110 by the adhesive layer 120 formed by the adhesive operation of the resin-impregnated kraft paper 20, and the veneer layer 130 is formed on the synthetic resin layer 110. ) Is formed. Thereby, the building material 100 of this example is completed (refer FIG. 1).

At this time, since both the resin impregnated kraft paper 20 and the synthetic resin layer 110 contain a resin having the same characteristics, the adhesive performance of the synthetic resin layer 110 and the resin impregnated kraft paper 20 is improved and is easy. And firmly the adhesive operation of the veneer 30 is made on the synthetic resin layer (110).

In addition, since the surface area of the synthetic resin layer 110 is increased as the uneven surface than the flat surface, due to the increase in the contact area between the synthetic resin layer 100 and the veneer 30, the adhesion of the veneer 30 is further improved.

Therefore, when the synthetic resin layer 100 has a concave-convex surface than the flat surface, the adhesive force of the veneer layer 300 positioned on the concave-convex surface of the synthetic resin layer 100 is improved, so that even if time passes, Separation of the veneer layer 300 is greatly reduced. For this reason, the lifetime of the building material of this example improves and user satisfaction increases.

In addition, unlike the present example, by coating the upper surface of the veneer layer 130 exposed to the outside to improve the strength of the veneer layer 130 can protect the veneer layer 130 by an external impact.

According to another example, as shown in FIG. 3, the building material 100a may be a thermosetting resin high pressure laminate (HPL) instead of the veneer layer 130.

Therefore, the building material 100a of the present example is positioned on the synthetic resin layer 110, the synthetic resin layer 110, and the adhesive layer 120a made of the adhesive and the HPL layer 150 made of a thermosetting resin high pressure makeup plate on the adhesive layer 120a. It is provided.

HPL uses paper as the substrate as a commonly used finish and consists of a core layer consisting of a surface overlay layer, a print layer (ie, shape paper), and kraft paper. Each layer is made of HPL to a thickness of 0.4 to 0.7 mm using a press impregnated with melamine or phenol resin.

As such, when HPL is used as the finishing material, a separate surface coating operation may not be performed.

At this time, the lower surface of the HPL layer 150, that is, the surface in contact with the adhesive layer 150 has an uneven surface. Here, the uneven surface may be formed on kraft paper corresponding to the bottom surface of the HPL layer 150.

Therefore, the HPL layer 150 is more easily and firmly and is not easily separated from the synthetic resin layer 110 even after a lapse of time due to the bonding operation with the adhesive layer 120a.

The method of manufacturing the building material 100a of this example is located on the synthetic resin layer 110 and the layer acting as the surface layer is the HPL layer 150 instead of the veneer layer 130 and by forming irregularities on one surface of the HPL layer It is similar except for the process of making the uneven surface. However, the adhesion of the adhesive layer 120a may be performed by a cold pressing process instead of thermocompression bonding.

Therefore, after the unevenness is formed on the upper surface of the synthetic resin layer 110 (Fig. 4 (a)), the adhesive 20a is applied on the upper surface of the uneven surface (Fig. 4 (b)).

In this case, the adhesive 20a may be a melamine resin adhesive or a phenol resin adhesive as the adhesive having secured water resistance, but is not limited thereto.

Next, the HPL 50 having the uneven surface formed on one surface is positioned on the adhesive 20a (FIG. 4C).

In this case, as described above, the core layer, which is one side of the HPL 50, is a layer made of kraft paper containing resin, and may form irregularities through a separate process.

Accordingly, before or after forming the uneven surface on the synthetic resin layer 110, for example, before being placed on the adhesive 20a, the surface of the core layer, which is the lower surface of the HPL 50, through a separate process. Form irregularities; In this case, the step of forming the concave-convex surface on the HPL 50 may use a sanding method, a sand blast method or a corona process using a sander (sander).

Next, a pressing process is performed to bond the uneven surface of the HPL 50 to the uneven surface of the synthetic resin layer 110 (FIG. 4 (c)) to form the HPL layer 150 on the synthetic resin layer 110. The example building material 100a is completed (refer FIG. 3). Here, the pressing process may be a cold pressing process.

The building materials 100 and 100a according to the present embodiment may be used as a flooring material such as a flooring flooring, a partition or a wall.

In the above, the Example of the building material of this invention and its manufacturing method was demonstrated. The present invention is not limited to the above-described embodiment and the accompanying drawings, and various modifications and variations will be possible in view of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be defined not only by the claims of the present specification but also by the equivalents of the claims.

100, 100a: building material 110: synthetic resin layer
120: adhesive layer 20: kraft paper
20a: adhesive 130: veneer layer
30: veneer 150: HPL layer
50: HPL

Claims (14)

  1. A synthetic resin layer containing a synthetic resin;
    An adhesive layer on the uneven surface of the synthetic resin layer; And
    Surface layer located on the adhesive layer
    Building materials, including.
  2. In claim 1,
    The synthetic resin is a group consisting of vinyl chloride resin, polyethylene, polypropylene, polyethylene terephthalate, high impact polystyrene, acrylonitrile-butadiene-styrene, polyurethane, styrene-butadiene-styrene and styrene-ethylene-butadiene-styrene block copolymers At least one selected from
    Building materials.
  3. In claim 1
    The synthetic resin layer further comprises at least one of stone powder, jade, ocher and glass fibers.
  4. In claim 1,
    The surface layer is a building material layer or a high pressure melamine laminate (HPL) layer of the thermosetting resin.
  5. In claim 4,
    When the surface layer is a thermosetting resin high pressure decorative plate layer, the surface of the thermosetting resin high pressure decorative plate layer in contact with the adhesive layer is an uneven surface.
  6. In claim 1,
    The adhesive layer is a building material consisting of kraft paper or adhesive.
  7. Forming irregularities on the upper surface of the synthetic resin layer containing the synthetic resin to form the upper surface as the irregular surface;
    Placing a resin impregnated kraft paper on the uneven surface of the synthetic resin layer;
    Forming a veneer on the resin-impregnated kraft paper; And
    Bonding the veneer to the concave-convex surface of the synthetic resin layer to form a surface layer on the synthetic resin layer
    Method of manufacturing a building material comprising a.
  8. Forming irregularities on the upper surface of the synthetic resin layer containing the synthetic resin to form the upper surface as the irregular surface;
    Applying an adhesive on the uneven surface of the synthetic resin layer;
    Positioning a high pressure melamine laminate (HPL) on the adhesive; And
    Bonding the thermosetting resin high pressure decorative plate to the uneven surface of the synthetic resin layer to form a surface layer on the synthetic resin layer
    Method of manufacturing a building material comprising a.
  9. In claim 8,
    The thermosetting resin high pressure decorative plate includes a core layer made of kraft paper, a printing layer positioned on the core layer, and an overlay layer positioned on the printing layer,
    Before placing on the adhesive, forming an uneven surface on the surface of the core layer located in the adhesive to make the surface of the uneven surface
    Method of manufacturing a building material further comprising a.
  10. In claim 7 or 8,
    The synthetic resin is a group consisting of vinyl chloride resin, polyethylene, polypropylene, polyethylene terephthalate, high impact polystyrene, acrylonitrile-butadiene-styrene, polyurethane, styrene-butadiene-styrene and styrene-ethylene-butadiene-styrene block copolymers At least one selected from
    Method of manufacturing building materials.
  11. In claim 7 or 8
    The synthetic resin layer further comprises at least one of stone powder, jade, ocher and glass fibers.
  12. In claim 7 or 8,
    The uneven surface forming step is a method of manufacturing a building material for forming the uneven surface by using a sanding method, a sand blast (sand blast) method or a corona process using a sander (sander).
  13. In claim 7,
    The surface layer forming step is a manufacturing method of a building material carried out by a thermocompression bonding step.
  14. In claim 8,
    The surface layer forming step is a manufacturing method of a building material carried out by a cold pressing process.
KR1020180014952A 2018-02-07 2018-02-07 Building material and method for manufacturing the same KR20190095674A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100537541B1 (en) 2002-04-04 2005-12-16 주식회사 엘지화학 Wood flooring with laminated wood and plastic layers using symmetric structure and method of manufacturing the same
KR100696119B1 (en) 2004-10-08 2007-03-20 주식회사 엘지화학 Flooring having surface layer of synthetic resin and wood-based board

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100537541B1 (en) 2002-04-04 2005-12-16 주식회사 엘지화학 Wood flooring with laminated wood and plastic layers using symmetric structure and method of manufacturing the same
KR100696119B1 (en) 2004-10-08 2007-03-20 주식회사 엘지화학 Flooring having surface layer of synthetic resin and wood-based board

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