KR100562199B1 - Polyolefine foam sandwich panel - Google Patents

Polyolefine foam sandwich panel Download PDF

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Publication number
KR100562199B1
KR100562199B1 KR1020030026609A KR20030026609A KR100562199B1 KR 100562199 B1 KR100562199 B1 KR 100562199B1 KR 1020030026609 A KR1020030026609 A KR 1020030026609A KR 20030026609 A KR20030026609 A KR 20030026609A KR 100562199 B1 KR100562199 B1 KR 100562199B1
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panel
foam
cross
polyolefin foam
polyolefin
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KR1020030026609A
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Korean (ko)
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KR20040092320A (en
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김완수
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김완수
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/26—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups
    • E04C2/284—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials composed of materials covered by two or more of groups E04C2/04, E04C2/08, E04C2/10 or of materials covered by one of these groups with a material not specified in one of the groups at least one of the materials being insulating
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/941—Building elements specially adapted therefor
    • E04B1/942—Building elements specially adapted therefor slab-shaped

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Laminated Bodies (AREA)
  • Building Environments (AREA)

Abstract

본 발명은 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬에 관한 것으로 특히 가건물의 외장이나 기타 건축물등의 외벽 또는 내, 외장재로 사용되는 샌드위치 판넬(panel)의 철판 판재의 내측으로 폴리올레핀발포체 판넬을 적용하여 생산성을 극대화 시키며 접착제를 사용하지 않아 작업성이 우수하며 화재시 발생하는 유독가스를 줄일 수 있는 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬에 관한 것이다.The present invention relates to a sandwich panel using a polyolefin foam panel, in particular to maximize the productivity by applying a polyolefin foam panel to the inner wall of the exterior of buildings or other buildings, or the iron plate of the sandwich panel (panel) used as an exterior material. The present invention relates to a sandwich panel using a polyolefin foam foam panel which is excellent in workability because it does not use an adhesive and can reduce toxic gas generated in a fire.

상기의 본 발명은 가교 폴리올레핀발포체 판넬의 양측으로 불연성판재를 열융착하여 형성한 것을 특징으로 하는 폴리올레핀발포체 판넬을 이용한 샌드위치판넬을 제공하되 상기 가교 폴리올레핀발포체 판넬은 가교올레핀발포체 판넬의 생산시 생성되는 가교 올레핀발포체의 스크랩을 열융착한 가교 폴리올레핀발포체 스크랩패널이나 무가교 폴리올레핀발포체 블럭과 가교 폴리올레핀발포체 스크랩블럭을 세로방향으로 각각 한층씩 열융착한 판넬이나, 무가교 폴리올레핀발포체 판넬의 양측으로 가교폴리올레핀발포체 판넬을 열융착한 것을 특징으로 한다.The present invention provides a sandwich panel using a polyolefin foam panel, characterized in that formed by heat-sealing non-combustible plate material on both sides of the cross-linked polyolefin foam panel, the cross-linked polyolefin foam panel is a cross-linking produced during the production of the cross-linked foam foam panel Cross-linked polyolefin foamed scrap panel, non-crosslinked polyolefin foamed foam block and cross-linked polyolefin foamed scrap block, each of which is thermally fused to the olefin foam, or crosslinked polyolefin foamed panels on both sides of the cross-linked polyolefin foamed foam panel. It characterized in that the heat-sealed.

Description

폴리올레핀발포체 판넬을 이용한 샌드위치 판넬{POLYOLEFINE FOAM SANDWICH PANEL}Sandwich panel using polyolefin foam panel {POLYOLEFINE FOAM SANDWICH PANEL}

도 1은 종래의 샌드위치 판넬을 나타낸 사시도,1 is a perspective view showing a conventional sandwich panel,

도 2는 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬을 나타낸 사시도,Figure 2 is a perspective view showing a sandwich panel using a polyolefin foam panel according to the present invention,

도 3은 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 다른 실시예를 나타낸 사시도,3 is a perspective view showing another embodiment of a sandwich panel using a polyolefin foam body panel according to the present invention,

도 4는 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 또 다른 실시예를 나타낸 사시도,Figure 4 is a perspective view showing another embodiment of a sandwich panel using a polyolefin foam body panel according to the present invention,

도 5는 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 또 다른 실시예를 나타낸 사시도,5 is a perspective view showing another embodiment of a sandwich panel using a polyolefin foam body panel according to the present invention,

도 6은 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 생산 상태를 나타낸 설명도,6 is an explanatory view showing a production state of a sandwich panel using a polyolefin foam body panel according to the present invention,

도 7은 도5의 샌드위치 판넬의 생산 상태를 나타낸 설명도이다.7 is an explanatory view showing a production state of the sandwich panel of FIG.

< 도면의 주요 부분에 대한 부호의 설명 ><Description of Symbols for Main Parts of Drawings>

10 : 폴리올레핀발포체 판넬 11 : 불연성판재10 polyolefin foam panel 11 non-flammable plate

12 : 가교 폴리올레핀발포체 스크랩패널 13 : 무가교 폴리올레핀발포체 블럭12 cross-linked polyolefin foam scrap panel 13 cross-linked polyolefin foam foam block

14 : 가교 폴리올레핀발포체 스크랩블럭 15 : 무가교 폴리올레핀발포체 판넬14 Crosslinked Polyolefin Foam Scrap Block 15 Crosslinked Polyolefin Foam Foam Panel

본 발명은 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬에 관한 것으로 특히 가건물의 외장이나 기타 건축물등의 외벽 또는 내, 외장재로 사용되는 샌드위치 판넬(panel)의 철판 판재의 내측으로 폴리올레핀발포체 판넬을 적용하여 생산성을 극대화 시키며 접착제를 사용하지 않아 작업성이 우수하며 화재시 발생하는 유독가스를 줄일 수 있는 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬에 관한 것이다.The present invention relates to a sandwich panel using a polyolefin foam panel, in particular to maximize the productivity by applying a polyolefin foam panel to the inner wall of the exterior of buildings or other buildings, or the iron plate of the sandwich panel (panel) used as an exterior material. The present invention relates to a sandwich panel using a polyolefin foam foam panel which is excellent in workability because it does not use an adhesive and can reduce toxic gas generated in a fire.

일반적으로 건축물에 사용되는 내, 외장재는 건축물의 내외부, 벽 또는 천정 등에 설치하여 건축물에 방음, 방수, 단열 및 미려함과 건물 보호 등의 기능을 수행하는 것이다.In general, the interior and exterior materials used in the building is installed on the interior and exterior, the wall or ceiling of the building to perform the functions of soundproofing, waterproofing, insulation and beauty and building protection.

하지만, 통상적으로 사용되고 있는 내, 외장재로서의 판넬은 샌드위치(sand witch)형을 취하는 겹판형상으로서, 중앙으로는 스티로폼이 형성되고 상기 스티로폼의 양측으로는 불연성 판재인 박판의 철판을 접착하여 형성하였다.However, a panel used as an inner and exterior material, which is commonly used, has a sandwich shape having a sandwich shape, and a styrofoam is formed at the center and a non-flammable sheet steel sheet is bonded to both sides of the styrofoam.

상기와 같은 종래의 전형적인 샌드위치 판넬이 도1에 도시되어 있다.Such a typical typical sandwich panel is shown in FIG.

도 1에서 부재번호 1은 스치로폼, 11은 불연성 판재를 각각 나타낸다.In Fig. 1, reference numeral 1 denotes a styrofoam, and 11 denotes a non-combustible sheet.

이에 도시된 바와같이 종래의 샌드위치 판넬은 일정크기의 블럭으로 형성된 스치로폼(1)을 롤형상으로 형성된 철판이나 알루미늄판재와 같은 불연성판재(11)가 롤에서 풀릴때 상기 불연성판재(11)의 사이에 상기 스치로폼(1)을 작업자가 일일이 공급하였다.As shown in the related art, a conventional sandwich panel is formed between the non-combustible plate 11 when the non-combustible plate 11, such as an iron plate or an aluminum plate, in which the styrofoam 1 formed in a block of a predetermined size is released from a roll. The styrofoam 1 was supplied by the worker one by one.

이와같이 불연성판재(11)의 사이에 스치로폼(1)을 개재시키며 상기 스치로폼(1)의 양측으로 용제나 접착제를 도포한 후 압착로울러로 가압하여 생산하였다.In this way, the styrofoam 1 was interposed between the non-combustible plate 11 and the solvent or the adhesive was applied to both sides of the styrofoam 1, and then pressurized with a pressing roller to produce the press.

그러나 상기와 같은 종래의 샌드위치 판넬은 작업자가 일일이 스치로폼을 삽입해야 하므로써 샌드위치 판넬의 생산을 자동화하기가 어려워 생산력이 저하되었으며 스치로폼과 불연성판재를 접착하기 위하여 사용되는 접찹제나 용제의 비용으로 인하여 제품의 단가가 상승하는 문제점이 있었다.However, the conventional sandwich panel as described above is difficult to automate the production of the sandwich panel because the operator has to insert the styrofoam one by one, the productivity is reduced, the unit price of the product due to the cost of the adhesive or solvent used to bond the styrofoam and non-combustible plate There was an issue rising.

또한 접착제의 도포가 불균일하여 제품의 품질이 저하되었으며 스치로폼과 불연성판제의 접착력이 견고하지 않아 제품의 내구성이 저하되었다.In addition, the quality of the product was deteriorated due to the uneven application of the adhesive, and the durability of the product was deteriorated because the adhesion between the styrofoam and the non-flammable plate was not strong.

또 다른 문제점으로는 접착제나 용제의 화학성분으로 인하여 독성에 의한 작업환경이 저하되었으며 화재와 폭발의 위험성이 상존하고 있음은 물론 건축물의 화재발생시 스치로폼이나 접착제 및 용제가 연소하면서 유독가스가 발생되어 많은 인명피해는 물론 공해유발의 문제점이 있었다..Another problem is that the working environment due to toxicity has been degraded due to the chemical composition of adhesives or solvents, and the risk of fire and explosion is present, as well as toxic gas is generated when combustion of styrofoam, adhesives and solvents occurs in the event of fire in buildings. There was a problem of human injury as well as pollution.

이에 본 발명은 상기와 같은 종래 기술의 문제점을 감안하여 안출한 것으로 롤형 폴리올레핀발포체 판넬을 사용하여 생산공정을 자동화할 수 있으며 열융착으로 접착을 하여 접착제를 사용하지 않아 작업환경을 청결히 하고 화재시 발생하는 매연, 유독가스의 발생차단으로 인명피해를 방지하고 환경을 보호할 수 있는 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬을 제공하는데 그 목적이 있다. Therefore, the present invention has been made in view of the problems of the prior art as described above, it is possible to automate the production process using the roll-type polyolefin foam panel, and the adhesive by heat fusion does not use the adhesive to clean the working environment and occurs in fire It is an object of the present invention to provide a sandwich panel using a polyolefin foam foam panel that can prevent human injury and protect the environment by generating soot and toxic gas.                         

상기와 같은 목적을 달성하기 위하여 본 발명은 가교 폴리올레핀발포체 판넬의 양측으로 불연성판재를 열융착하여 형성한 것을 특징으로 하는 폴리올레핀발포체 판넬을 이용한 샌드위치판넬을 제공하되 상기 가교 폴리올레핀발포체 판넬은 가교올레핀발포체 판넬의 생산시 생성되는 가교 올레핀발포체의 스크랩을 열융착한 가교 폴리올레핀발포체 스크랩패널이나 무가교 폴리올레핀발포체 블럭과 가교 폴리올레핀발포체 스크랩블럭을 세로방향으로 각각 한층씩 열융착한 판넬이나, 무가교 폴리올레핀발포체 판넬의 양측으로 가교폴리올레핀발포체 판넬을 열융착한 것을 특징으로 하는 폴리올레핀발포체 판넬을 이용한 샌드위치판넬을 제공한다.In order to achieve the above object, the present invention provides a sandwich panel using a polyolefin foam panel, characterized in that the non-combustible plate formed on both sides of the cross-linked polyolefin foam panel, the cross-linked polyolefin foam panel is a cross-linked olefin foam panel Of crosslinked polyolefin foam scrap plates, crosslinked polyolefin foam foam blocks and crosslinked polyolefin foam scrap blocks, which are thermally fused to the crosslinked olefin foam foams produced during production of the crosslinked polyolefin foam foam blocks, or crosslinked polyolefin foam foam panels. Provided is a sandwich panel using a polyolefin foam panel characterized in that the cross-linked polyolefin foam foam panel on both sides.

이하 상기한 바와 같은 본 발명의 바람직한 실시예를 첨부도면을 참고하여 상세히 설명하면 다음과 같다.Hereinafter, a preferred embodiment of the present invention as described above with reference to the accompanying drawings in detail as follows.

첨부된 도 2는 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬을 나타낸 사시도, 도 3은 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 다른 실시예를 나타낸 사시도, 도 4는 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 또 다른 실시예를 나타낸 사시도, 도 5는 본 발명에 따른 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬의 또 다른 실시예를 나타낸 사시도이다.2 is a perspective view showing a sandwich panel using a polyolefin foam body panel according to the present invention, Figure 3 is a perspective view showing another embodiment of a sandwich panel using a polyolefin foam body panel according to the present invention, Figure 4 is a polyolefin according to the present invention Perspective view showing another embodiment of a sandwich panel using a foam panel, Figure 5 is a perspective view showing another embodiment of a sandwich panel using a polyolefin foam body panel according to the present invention.

이에 도시된 바와같이 본 발명의 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬은 도 2에 도시된 바와같이 가교 폴리올레핀발포체 판넬(10)의 양측으로 불연성판재(11)를 열융착하여 형성한다.As shown therein, the sandwich panel using the polyolefin foam body panel of the present invention is formed by thermally bonding the nonflammable plate member 11 to both sides of the crosslinked polyolefin foam body panel 10 as shown in FIG.

이와같이 형성된 폴리올레핀판넬을 이용한 샌드위치판넬의 가교 폴리올레핀발포체 판넬(10)은 도 3에 도시된 바와같이 가교올레핀발포체 판넬의 생산시 생성되는 가교 올레핀발포체의 스크랩을 열융착한 가교 폴리올레핀발포체 스크랩판넬(12)을 형성하면 가교올레핀발포체 스크랩의 재활용을 통하여 생산단가를 낮출수 있다.The cross-linked polyolefin foam panel 10 of the sandwich panel using the polyolefin panel formed as described above is a cross-linked polyolefin foam scrap panel 12 obtained by heat-sealing the scrap of the cross-linked olefin foam produced in the production of the cross-linked olefin foam panel as shown in FIG. Forming can lower the production cost through recycling the crosslinked olefin foam scrap.

또한 도 4에 도시된 바와같이 상기 가교 폴리올레핀발포체 판넬(10)을 무가교 폴리올레핀블럭(13)과 가교 폴리올레핀발포체 스크랩블럭(14)을 세로방향으로 각각 한층씩 열핀에 의하여 열융착하여 판넬을 형성하여 폴리올레핀발포체 판넬을 이용한 샌드위치판넬을 형성한다.In addition, as shown in FIG. 4, the cross-linked polyolefin foam panel 10 is thermally fused to the cross-linked polyolefin block 13 and the cross-linked polyolefin foam scrap scrap 14 by a thermal pin one by one to form a panel. A sandwich panel using a polyolefin foam panel is formed.

한편 도 5에 도시된 바와같이 폴리올레핀발포체 판넬을 이용한 샌드위치판넬은 비교적 생산비용이 적으나 철판과는 열접착이 되지않는 무가교 폴리올레핀발포체 판넬(15)의 양측으로 가교폴리올레핀발포체 판넬(15)을 열융착한 후 상기 가교 폴리올레핀발포체 판넬(10)과 불연성판재(11)를 열융착한다.Meanwhile, as shown in FIG. 5, the sandwich panel using the polyolefin foam panel has a relatively low production cost, but the crosslinked polyolefin foam panel 15 is opened on both sides of the non-crosslinked polyolefin foam panel 15 that is not thermally bonded to the iron plate. After fusion, the crosslinked polyolefin foam panel 10 and the non-combustible plate 11 are thermally fused.

상기와 같이 구성된 본 발명의 작용 및 효과를 설명하면 다음과 같다.Referring to the operation and effects of the present invention configured as described above are as follows.

먼저 도 2 내지 도4에 도시된 폴리올레핀발포체 판넬을 이용한 샌드위치판넬은 도 6에 도시된 바와같이 불연성 판재(11)가 감겨져 있는 롤에 상기 불연성 판재(11)를 공급하고 중앙으로는 가교 폴리올레핀발포체 판넬(10), 가교 폴리올레핀발포체 스크랩판넬(12), 무가교 폴리올레핀발포체 블럭(13)과 가교 폴리올레핀발포체 스크랩블럭(14)을 세로방향으로 각각 한층씩 열핀에 의하여 열융착한 판넬이 감겨져 있는 롤을 통하여 공급된다.First, the sandwich panel using the polyolefin foam panel shown in FIGS. 2 to 4 supplies the nonflammable sheet 11 to the roll on which the nonflammable sheet 11 is wound, as shown in FIG. 6, and the crosslinked polyolefin foam panel in the center. (10), the crosslinked polyolefin foam scrap plate (12), the crosslinked polyolefin foam foam block (13) and the crosslinked polyolefin foam foam scrap block (14) through a roll in which the heat-sealed panels are wound one by one each in the longitudinal direction. Supplied.

이러한 상태에서 상기 가교 폴리올레핀발포체 판넬(10), 가교 폴리올레핀발포체 스크랩판넬(12), 무가교 폴리올레핀발포체 블럭(13)과 가교 폴리올레핀발포체 스크랩블럭(14)을 세로방향으로 각각 한층씩 열핀에 의하여 열융착한 판넬의 상하측으로 열풍이나 가열버너(20)를 통하여 표면을 용융시킨 후 상기 불연성 판제(11)를 가압로울러(30)에 의해 가압하여 접착한다.In such a state, the crosslinked polyolefin foam body panel 10, the crosslinked polyolefin foam body scrap panel 12, the crosslinked polyolefin foam body block 13, and the crosslinked polyolefin foam body scrap block 14 are thermally fused by hot fins one by one in the longitudinal direction. After melting the surface through hot air or the heating burner 20 to the upper and lower sides of the panel, the non-combustible plate 11 is pressed by the pressure roller 30 and bonded.

이러한 상태에서 일정한 크기에 맞게 컷팅기(40)를 통하여 컷팅하여 판넬을 생산한다.In this state to cut through a cutting machine 40 to a certain size to produce a panel.

또한 도 5에 도시된 바와같은 폴리올레핀발포체 판넬을 이용한 샌드위치판넬을 생산하기 위한 공정으로는 도 7에 도시된 바와같이 불연성 판재(11)가 감겨져 있는 롤에서 상기 불연성 판재(11)를 공급하고 중앙으로는 무가교 폴리올레핀발포체 판넬(15)이 감긴 롤을 통하여 무가교 폴리올레핀발포체 판넬(15)을 공급하며 무가교 폴리올레핀발포체(15)의 양측으로 가교폴리올레핀발포체 판넬(10)이 감긴 롤을 통하여 가교 폴리올레핀발포체(10)을 공급하여 상기 가교폴리올레핀발포체(10)와 무가교 폴리올레핀발포체(15)의 표면에 열풍이나 가열버너(20)를 통하여 표면을 용융시킨 후 상기 불연성 판제(11)를 가압로울러(30)에 의해 가압하여 접착한다.In addition, as a process for producing a sandwich panel using a polyolefin foam body panel as shown in Figure 5 as shown in Figure 7 the non-flammable plate 11 is supplied in the roll and the non-flammable plate 11 to the center The non-crosslinked polyolefin foam foam panel 15 is supplied to the non-crosslinked polyolefin foam foam panel 15 through a roll wound, and the crosslinked polyolefin foam foam panel 10 is wound on the both sides of the crosslinked polyolefin foam foam panel 10. After supplying the (10) to the surface of the cross-linked polyolefin foam 10 and the cross-linked polyolefin foam (15) through hot air or a heating burner (20), the non-flammable plate 11 pressurized roller (30) It presses and bonds by.

이상에서와 같이 본 발명은 롤형 폴리올레핀발포체 판넬을 사용하여 생산공정을 자동화할 수 있으며 열융착으로 접착을 하여 접착제를 사용하지 않아 작업환경을 청결히 하고 화재시 발생하는 매연, 유독가스의 발생차단으로 인명피해를 방지하고 환경을 보호하는 효과가 있다. As described above, the present invention can automate the production process by using the roll-type polyolefin foam panel, and it is bonded by heat fusion to clean the working environment by using no adhesive, and to prevent smoke and toxic gas generated from fire. It is effective in preventing damage and protecting the environment.                     

이상에서는 본 발명을 특정의 바람직한 실시예를 예를들어 도시하고 설명하였으나, 본 발명은 상기한 실시예에 한정되지 아니하며 본 발명의 정신을 벗어나지 않는 범위내에서 당해 발명이 속하는 기술분야에서 통상의 지식을 가진자에 의해 다양한 변경과 수정이 가능할 것이다.In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

Claims (4)

삭제delete 삭제delete 가교 폴리올레핀발포체 판넬(10)의 양측으로 불연성판재(11)를 열융착하여 형성한 것으로 이루어지되,The non-flammable plate member 11 is formed by heat-sealing the both sides of the cross-linked polyolefin foam panel 10, 상기 가교 폴리올레핀발포체 판넬(10)은 무가교 폴리올레핀발포체 블럭(13)과 가교 폴리올레핀발포체 스크랩블럭(14)을 세로방향으로 각각 한층씩 열융착한 것을 특징으로 폴리올레핀발포체 판넬을 이용한 샌드위치 판넬.The crosslinked polyolefin foam panel 10 is a sandwich panel using a polyolefin foam panel, characterized in that the cross-linked polyolefin foam foam block 13 and the crosslinked polyolefin foam foam scrap block 14, respectively, one by one in the longitudinal direction. 삭제delete
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