KR900003032A - 시이트 또는 웨브형의 연질포장재료 - Google Patents

시이트 또는 웨브형의 연질포장재료 Download PDF

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Publication number
KR900003032A
KR900003032A KR1019890010970A KR890010970A KR900003032A KR 900003032 A KR900003032 A KR 900003032A KR 1019890010970 A KR1019890010970 A KR 1019890010970A KR 890010970 A KR890010970 A KR 890010970A KR 900003032 A KR900003032 A KR 900003032A
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South Korea
Prior art keywords
packaging material
substrate
substrate layers
layer
layers
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KR1019890010970A
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English (en)
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KR940009014B1 (ko
Inventor
로센 아케
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테트라 팩 파이넌스 앤드 트레딩 에스 에이
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Priority claimed from SE8802777A external-priority patent/SE467926B/sv
Priority claimed from SE8802778A external-priority patent/SE467917B/sv
Application filed by 테트라 팩 파이넌스 앤드 트레딩 에스 에이 filed Critical 테트라 팩 파이넌스 앤드 트레딩 에스 에이
Publication of KR900003032A publication Critical patent/KR900003032A/ko
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Publication of KR940009014B1 publication Critical patent/KR940009014B1/ko

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/065—Layered 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 of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/04—Bending or folding of plates or sheets
    • B29C53/06—Forming folding lines by pressing or scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered 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
    • B32B27/08—Layered 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 of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS 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
    • B65D5/00—Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper
    • B65D5/42—Details of containers or of foldable or erectable container blanks
    • B65D5/56—Linings or internal coatings, e.g. pre-formed trays provided with a blow- or thermoformed layer
    • B65D5/563—Laminated linings; Coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0053—Moulding articles characterised by the shape of the surface, e.g. ribs, high polish
    • B29C37/0057—Moulding single grooves or ribs, e.g. tear lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1376—Foam or porous material containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/2457—Parallel ribs and/or grooves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

내용 없음

Description

시이트 또는 웨브형의 연질포장재료
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음
제1도는 본 발명의 첫째 특징에 따른 웨브형 포장재료의 부분도.
제2도는 제1도의 선Ⅱ-Ⅱ에 따른 재료의 확대 단면도.
제3도는 포장재료를 제조하기 위한 개략적 배치도.
제4도는 본 발명의 둘째 특징인 따른 웨이브현 포장재료의 전체 포장길이에 해당하는 부분도.
제5a도는 제4도의 선 Ⅴ-Ⅴ에 따른 재료의 확대 단면도.
제5b도는 본 발명의 다른 특징에 따른 포장재료의 제5a도에서 포장재료에서 해당하는 단면도.
제6도는 제4도와 제5a도의 포장재료를 제조하기 위한 개략적 배치도.

Claims (8)

  1. 혼합물의 총량으로 계산하여 50-80%의 무기물, 특히 광물 충전제로 이루어진 광물-충전 열가소성수지가 서로 척층된 하나 또는 그 이상의 압출된 기재층(4; 17a와 17b; 18a,18b)으로 재료가 이루어진, 양호한 치수 강성율을 갖는 액체-내밀성 포장재료를 제조하기 위한 시이트 또는 웨브형의 연질, 주름진 재료에 있어서, 상기 열가소성 수지를 ASTM(2.16kg,230℃)에 따라 0.5-5의 용해수지를 갖는 프로필렌-주재 중합 체중에서 선택하고, 상기 한기 재층(4) 또는 상기 기재층(17a, 17b; 18a,18b)에 각 기재층의 압출후 즉시 또는 연관하여 플라스틱변형에 의하여 형성된 주름선(5,6; 18,20)의 모양을 부여함을 특징으로 하는 포장재료.
  2. 제1항에 있어서, 의도하는 포장용기의 내면에 있는 한 기재층은 운모를 함유하는 반면에, 다른 기재층은 황산칼슘 또는 탄산칼슘과 같은 칼슘염을 함유하는 서로 적층된 두 기재층(17a, 17b; 18a,18b)으로 이루어짐을 특징으로 하는 포장재료.
  3. 제2항에 있어서, 두 기재층이 동시 압출됨을 특징으로 하는 포장재료.
  4. 제1항 또는 제2항에 있어서, 상기 두 기재층 각각이 50-200㎛, 바람직하기로는 100㎛의 재료 두께를 가짐을 특징으로 하는 포장재료.
  5. 제1항에 있어서, 상기한 기재층(4)가 100-400㎛, 바람직하기로는 300㎛의 두께를 가짐을 특징으로 하는 포장재료.
  6. 제2항 또는 제4항중 어느 한 항에 있어서, 상기 두 기재층(18a,18b)가 ASTM(2.16kg,230℃)에 따라 0.5-5 사이의 용해수지를 갖는 포말프로필렌-주제 중합 체의 중간층(18c)의 수단에 의하여 서로 접합됨을 특징으로 하는 포장재료.
  7. 제6항에 있어서, 상기 두 기재층(18a,18b)와 중간층(18C)가 동시압출에 의하여 서로 제조됨을 특징으로 하는 포장재료.
  8. 제6항 또는 제7항에 있어서, 상기 두 기재층과 중간층 각각이 100㎛의 재료 두께를 가짐을 특징으로 하는 포장재료.
    ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.
KR1019890010970A 1988-08-01 1989-08-01 시이트또는웨브형의연질포장재료 KR940009014B1 (ko)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE8802777A SE467926B (sv) 1988-08-01 1988-08-01 Flexibelt, ark- eller banformigt foerpackningsmaterial
SE8802778-4 1988-08-01
SE8802777-6 1988-08-01
SE8802778A SE467917B (sv) 1988-08-01 1988-08-01 Foerpackningsmaterial samt av materialet framstaellda foerpackningsbehaallare

Publications (2)

Publication Number Publication Date
KR900003032A true KR900003032A (ko) 1990-03-23
KR940009014B1 KR940009014B1 (ko) 1994-09-29

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KR1019890010970A KR940009014B1 (ko) 1988-08-01 1989-08-01 시이트또는웨브형의연질포장재료

Country Status (21)

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US (1) US5143764A (ko)
EP (2) EP0353496B1 (ko)
JP (1) JP2848635B2 (ko)
KR (1) KR940009014B1 (ko)
CN (1) CN1018259B (ko)
AR (1) AR240690A1 (ko)
AT (1) ATE119830T1 (ko)
AU (1) AU614653B2 (ko)
BR (1) BR8903823A (ko)
CA (1) CA1333879C (ko)
CZ (1) CZ283265B6 (ko)
DE (1) DE68921678T2 (ko)
ES (1) ES2069552T3 (ko)
HU (1) HU210360B (ko)
PL (1) PL160551B1 (ko)
PT (1) PT91340B (ko)
RO (1) RO104653B1 (ko)
RU (1) RU1804430C (ko)
SK (1) SK278374B6 (ko)
UA (1) UA13452A (ko)
YU (1) YU46751B (ko)

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE467772B (sv) 1991-01-09 1992-09-14 Tetra Alfa Holdings Foerpackningsmaterial jaemte anvaendning av materialet foer framstaellning av behaallare
SE468635B (sv) * 1991-01-09 1993-02-22 Tetra Alfa Holdings Foerpackningsmaterial jaemte anvaendning av materialet foer framstaellning av behaallare med goda syrgastaethetsegenskaper
SE502399C2 (sv) * 1991-02-14 1995-10-16 Tetra Laval Holdings & Finance Med öppningsanvisning försedd förpackningsbehållare
SE502398C2 (sv) * 1991-03-07 1995-10-16 Tetra Laval Holdings & Finance Kantförstärkt förpackningsbehållare
SE502397C2 (sv) * 1991-05-03 1995-10-16 Tetra Laval Holdings & Finance Förpackningslaminat med goda förseglings- och barriäregenskaper samt av förpackningslaminatet framställda förpackningsbehållare
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HU210360B (en) 1995-04-28
RU1804430C (ru) 1993-03-23
DE68921678T2 (de) 1995-07-27
EP0353496A1 (en) 1990-02-07
PT91340A (pt) 1990-03-08
KR940009014B1 (ko) 1994-09-29
ES2069552T3 (es) 1995-05-16
JP2848635B2 (ja) 1999-01-20
BR8903823A (pt) 1990-03-20
CA1333879C (en) 1995-01-10
AR240690A1 (es) 1990-09-28
CZ283265B6 (cs) 1998-02-18
US5143764A (en) 1992-09-01
PL160551B1 (pl) 1993-03-31
DE68921678D1 (de) 1995-04-20
YU150989A (en) 1991-06-30
AU614653B2 (en) 1991-09-05
CS458989A3 (en) 1992-04-15
ATE119830T1 (de) 1995-04-15
PT91340B (pt) 1996-01-31
EP0640461A1 (en) 1995-03-01
SK278374B6 (en) 1997-02-05
UA13452A (uk) 1997-02-28
RO104653B1 (en) 1993-04-25
YU46751B (sh) 1994-04-05
CN1039771A (zh) 1990-02-21
CN1018259B (zh) 1992-09-16
EP0353496B1 (en) 1995-03-15
AU3914689A (en) 1990-02-01
JPH02175141A (ja) 1990-07-06
HUT54564A (en) 1991-03-28

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