KR950016863A - 시이트형 산소 흡수재 및 이의 제조방법 - Google Patents

시이트형 산소 흡수재 및 이의 제조방법 Download PDF

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KR950016863A
KR950016863A KR1019940033183A KR19940033183A KR950016863A KR 950016863 A KR950016863 A KR 950016863A KR 1019940033183 A KR1019940033183 A KR 1019940033183A KR 19940033183 A KR19940033183 A KR 19940033183A KR 950016863 A KR950016863 A KR 950016863A
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sheet
oxygen
type oxygen
oxygen absorber
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히데유끼 다까하시
히데또시 하따께야마
후또시 나까야
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니시까와 레이저
미쓰비시 가스 가가꾸 가부시끼가이샤
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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
    • 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
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28033Membrane, sheet, cloth, pad, lamellar or mat
    • B01J20/28035Membrane, sheet, cloth, pad, lamellar or mat with more than one layer, e.g. laminates, separated sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • 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
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • 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
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • 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
    • B32B7/06Interconnection of layers permitting easy separation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/266Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
    • B65D81/267Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants the absorber being in sheet form
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/24Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants
    • B65D81/26Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators
    • B65D81/266Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants
    • B65D81/268Adaptations for preventing deterioration or decay of contents; Applications to the container or packaging material of food preservatives, fungicides, pesticides or animal repellants with provision for draining away, or absorbing, or removing by ventilation, fluids, e.g. exuded by contents; Applications of corrosion inhibitors or desiccators for absorbing gases, e.g. oxygen absorbers or desiccants the absorber being enclosed in a small pack, e.g. bag, included in the package
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10Inorganic adsorbents
    • B01D2253/112Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
    • B01D2253/1122Metals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2253/00Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/20Organic adsorbents
    • B01D2253/202Polymeric adsorbents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/10Single element gases other than halogens
    • B01D2257/104Oxygen
    • 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
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/724Permeability to gases, adsorption
    • 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
    • B32B2309/00Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08Dimensions, e.g. volume
    • B32B2309/10Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105Thickness
    • 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
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Food Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Packages (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Laminated Bodies (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

본 발명에 따른 시이트형 산소 흡수재는 분리층, 접착제층을 갖는 기초층, 산소 흡수층 및 기체 투과성층 순서의 적층물을 포함하며, 기체 투과성층은 적층물의 주변부에서 기초층에 직접 고정되며 분리층으로부터 용이하게 박리하여 부착가능하도록 제조된다.

Description

시이트형 산소 흡수재 및 이의 제조방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 연속 접착 스트립형 흡수재의 단면도이다.
제2도는 점착 스트립형 산소 흡수재의 한 구현예의 단면도이다.
제3도는 점착 스트립형 산소 흡수재의 한 구현예의 단면도이다.

Claims (22)

  1. 포장재내의 산소를 흡수할 수 있는 산소 흡수층; 산소 흡수층을 덮은 기체 투과성층; 및 산소 흡수층 및 상기 기체 투과성층을 지지하며, 산소 흡수층 및 기체 투과성 층을 포장재에 부착하기 위한 접착제층을 갖는 기초층으로 구성되며, 상기 기체 투과성층은 직접 상기 기초층에 상기 산소 흡수층의 주변부에서 부착되는 것을 특징으로 하는 산소 흡수성을 가지며 포장재에 부착가능한 시이트형 산소 흡수재.
  2. 제1항에 있어서, 사이에 상기 접착제 층이 존재하며 기초층이 부착하는 분리층을 더 포함하며, 상기 기초층이 상기 분리층으로부터 박리될 수 있고 상기 포장재에 상기 접착제층에 의하여 부착되는 시이트형 산소 흡수재.
  3. 제2항에 있어서, 상기 산소 흡수층, 상기 기체 투과성층 및 상기 기초층이 점착 스트림으로 형성되는 시이트형 산소 흡수재.
  4. 제3항에 있어서, 상기 분리층이 벨트형으로 형성되고, 상기 점착 스트립의 다수가 분리층에 연속적으로 부착되는 시이트형 산소 흡수재.
  5. 제1항에 있어서, 상기 산소 흡수층이 시이트형 산소 흡수제를 포함하는 시이트형 산소 흡수재.
  6. 제5항에 있어서, 상기 시이트형 산소 흡수제가 철분말 기재 산소 흡수 조성물을 열가소성 섬유내로 분산시키고 시이트 형태로 열 성형시킴으로써 제조되는 시이트형 산소 흡수재.
  7. 제1항에 있어서, 상기 산소 흡수 조성물은 철기재 산소 흡수물질 및 열가소성 수지의 혼합물을 포함하고, 상기 조성물은 시이트 형태로 열성형되는 시이트형 산소 흡수재.
  8. 제7항에 있어서, 상기 철기재 산소 흡수제의 주요성분이 철분말인 시이트형 산소 흡수재.
  9. 제7항에 있어서,상기 철기재 산소 흡수제가 철분말 및 금속 할로겐화물을 포함하는 시이트형 산소 흡수재.
  10. 제7항에 있어서, 상기 수지가 열가소성 폴리오레핀 기재 수지인 시이트형 산소 흡수재.
  11. 제7항에 있어서, 시이트형으로 가공한 후에, 상기 조성물을 1축이상의 방향으로 원래 크기의 1.5 내지 10배 연신시킴으로써 성형하는 시이트형 산소 흡수재.
  12. 제11항에 있어서, 상기 연신 시이트가 미소 기공을 갖는 시이트형 산소 흡수재.
  13. 제2항에 있어서, 상기 기초층이 형태 안정성을 갖는 기초물질을 더 포함하는 시이트형 산소 흡수재.
  14. 제13항에 있어서, 필요한 주의 사항이 분리층과 대면하는 기초물질의 표면에 인쇄되는 시이트형 산소 흡수재.
  15. 제1항에 있어서, 상기 산소 흡수층이 25℃의 온도에서 100ml/㎡ . Hr의 산소 흡수 속도를 갖는 시이트형 산소 흡수재.
  16. 제2항에 있어서, 상기 분리층이 일종이상의 분리제가 도포된 종이, 수지 필름 및 금속 호일, 또는 이의 임의의 조합물을 포함하는 시이트형 산소 흡수재.
  17. 제2항에 있어서, 두께가 0.1 내지 5mm인 시이트형 산소 흡수재.
  18. 제1항에 있어서, 물을 함유하는 시이트가 상기 산소 흡수층위에 놓여지는 시이트형 산소 흡수재.
  19. 제1항에 있어서, 상기 기체 투과성층이 10,000cc/㎡ . 24Hr . atm이상, 바람직하게는 30,000cc/㎡ . 24Hr . atm 이상, 보다 바람직하게는 50,000cc/㎡ . 24Hr . atm 이상의 산소 투과능을 갖는 시이트형 산소 흡수재.
  20. 제1항에 있어서, 상기 산소 흡수층의 상부 표면 및 측면 가장자리가 상기 기체 투과성층으로 덮히는 시이트형 산소 흡수재.
  21. 제13항에 있어서, 상기 접착제 층이 제1접착제 층 및 제2접착제 층을 포함하며, 상기 제1접착제층은 산소 흡수층 및 기체 투과성층을 기초 물질에 부착시키고, 상기 제2접착제 층은 기초 물질을 분리층 및 포장재에 부착시킬 수 있는 시이트형 산소 흡수재.
  22. 기체 투과성층을 산소 흡수제를 함유하는 산소 흡수층을 덮도록 위치시키는 제1단계; 산소 흡수층 및 기체 투과성 층을 접착제 층을 사이에 함유하는 기초층을 갖는 분리층에 위치시키는 제2단계; 상기 기체 투과성 시이트가 상기 기초층에 직접 접촉되어 있는 영역 경계에서 점착 스트립 형태의 산소 흡수층, 기체 투과성 층 및 기초층을 펀칭하는 제3단계; 펀칭하지 않은 영역을 제거하는 제4단계로 구성되는 시이트형 산소 흡수재의 제조방법.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019940033183A 1993-12-07 1994-12-07 시이트형 산소흡수재 및 이의 제조방법 KR100288895B1 (ko)

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JP30651293 1993-12-07
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KR100288895B1 KR100288895B1 (ko) 2001-05-02

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5972452A (en) * 1993-12-07 1999-10-26 Mitsubishi Gas Chemical Company, Inc. Sheet shaped oxygen absorbing member and method for manufacture thereof
DE69813069T2 (de) * 1997-02-19 2004-01-29 Mitsubishi Gas Chemical Co Etikettförmiges sauerstoffabsorbierendes Mittel
FR2770224A1 (fr) * 1997-10-03 1999-04-30 Akio Usui Desoxydant liquide visqueux, feuille desoxydante constituee de celui-ci et procede de fabrication de la feuille desoxydante
CA2233387A1 (en) * 1998-03-26 1999-09-26 Michael Glover Colour fade protection systems
EP0964046B1 (en) 1998-06-03 2003-07-30 Mitsubishi Gas Chemical Company, Inc. Oxygen absorbing composition, oxygen absorbing resin and preserving method
EP1344641B1 (en) 2002-03-13 2005-11-02 Mitsubishi Gas Chemical Company, Inc. Oxygen-absorbing label
DK1862397T3 (da) * 2006-06-02 2009-12-07 Constantia Patz Ges M B H Blisterdækfolie
CZ307471B6 (cs) * 2011-08-19 2018-10-03 Invos, Spol. S R. O. Obalová fólie s antioxidačními účinky
US9750811B2 (en) 2015-09-15 2017-09-05 Boveda, Inc. Devices and methods for controlling headspace humidity and oxygen levels
EP3851098B1 (en) 2016-10-12 2022-12-21 Drug Plastics & Glass Company, Inc. Container assembly with predetermined humidity
EP3526136B1 (en) * 2016-10-12 2022-11-30 Boveda Inc. Device for controlling headspace humidity in a jar
CN111186633A (zh) * 2018-11-15 2020-05-22 科劲创销有限公司 用于保持食品新鲜的食品容器
CN115339772B (zh) * 2021-12-30 2024-06-04 福建华赢化工有限公司 一种物品保存用双向调湿包及其应用

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2782727B2 (ja) * 1988-09-08 1998-08-06 三菱瓦斯化学株式会社 フィルム状脱酸素剤
JPH0474515A (ja) * 1990-07-13 1992-03-09 Toray Ind Inc 酸素吸収体
DK0567529T4 (da) * 1991-01-07 2010-04-12 Multisorb Tech Inc Oxygenabsorberende etiket

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TW263470B (ko) 1995-11-21
KR100288895B1 (ko) 2001-05-02
EP0657277A3 (en) 1995-11-29
EP0657277A2 (en) 1995-06-14
DE69432337T2 (de) 2003-12-11
EP0657277B1 (en) 2003-03-26
DE69432337D1 (de) 2003-04-30

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