[go: up one dir, main page]

WO2003106277A1 - Metalized seam seal for single wrap container - Google Patents

Metalized seam seal for single wrap container Download PDF

Info

Publication number
WO2003106277A1
WO2003106277A1 PCT/US2003/010027 US0310027W WO03106277A1 WO 2003106277 A1 WO2003106277 A1 WO 2003106277A1 US 0310027 W US0310027 W US 0310027W WO 03106277 A1 WO03106277 A1 WO 03106277A1
Authority
WO
WIPO (PCT)
Prior art keywords
container
seam
layer
polyolefin
single wrap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2003/010027
Other languages
French (fr)
Inventor
Keith Rea
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonoco Development Inc
Original Assignee
Sonoco Development Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sonoco Development Inc filed Critical Sonoco Development Inc
Priority to AU2003223409A priority Critical patent/AU2003223409A1/en
Publication of WO2003106277A1 publication Critical patent/WO2003106277A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/22—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines with double walls; with walls incorporating air-chambers; with walls made of laminated 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
    • B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
    • B65D3/28—Other details of walls

Definitions

  • This patent relates to a single wrap container for holding foodstuffs or other oxygen or moisture sensitive products. More particularly, this patent relates to a single wrap container having a seam having an exposed underlying edge enclosed by tape having a metalized layer.
  • Single wrap containers formed from a single ply of material, can be used to hold drink mixes, snacks and other foods.
  • the single wrap container body typically is formed from a blank comprising layers of, from the inside out, polyolefin, paper stock, polyolefin, metal foil, polyolefin, printed paper and overlacquer.
  • the blank is die cut to the desired silhouette and then formed into a tubular shape by wrapping it once around a mandrel .
  • the overlapping ends of the blank form a straight seam.
  • the seam has an underlying portion and an overlying portion.
  • the edge of the underlying portion of the seam, and therefore an edge of the paper layer, is exposed to the container contents. Air and moisture can migrate through the paper layer into or out of the container.
  • LDPE low density polyethylene
  • EVOH ethylene vinyl alcohol copolymer
  • PET polyethylene terephthalate
  • PET glycol modified PET
  • nylon nylon, and combinations thereof.
  • the inventor made single wrap straight seam cans and covered the underlying body wall exposed edge with seam tape comprising a layer of PET interposed between LDPE layers.
  • the sealed containers were tested for air migration levels and the resulting levels were unacceptably high (0.10 cc of oxygen per container per day) .
  • What is needed is an improved side seam tape for preventing migration of air and moisture into or out of a sealed container.
  • the present invention is an improved seam tape for protecting the underlying exposed edge of single wrap containers.
  • the tape comprises a layer of metalized PET interposed between layers of LDPE.
  • the seam tape is especially useful with containers designed to hold products sensitive to oxygen and water.
  • Figure 1 is a perspective view of a single wrap blank formed into a tubular container.
  • Figure 2 is an enlarged partial sectional view of the single wrap container of Figure 1.
  • Figure 3 is an enlarged partial sectional view of the single wrap container of Figure 1 showing the seam tape of the present invention.
  • Figure 1 a blank formed into a single wrap straight walled tubular container.
  • the container 10 has a straight overlap seam 12 having an underlying portion 14 and an overlying portion 16.
  • the edge 18 of the underlying portion 14 is exposed to the inside contents of the container 10.
  • the blank used to form the single wrap container typically comprises layers of, from the inside out, polyolefin, paper stock, polyolefin, metal foil, polyolefin, printed paper and overlacquer.
  • polyolefin layers are low density polyethylene (LDPE) , but any suitable polyolefin, including high density polyethylene (HDPE) , may be used. Because the tubular container has an exposed edge, air can migrate through the paper layer into the container and moisture from the contents can wick into the paper layer.
  • LDPE low density polyethylene
  • HDPE high density polyethylene
  • seam tape 20 can be used to cover the underlying exposed edge 18 of the container wall, as shown in Figure 3.
  • Conventional seam tape comprises one or more layers of low density polyethylene (LDPE) , ethylene vinyl alcohol copolymer (EVOH) , polyethylene terephthalate (PET) , PETG, nylon, or combinations thereof.
  • LDPE low density polyethylene
  • EVOH ethylene vinyl alcohol copolymer
  • PET polyethylene terephthalate
  • PET polyethylene terephthalate
  • nylon nylon
  • the present invention is a seam tape comprising, in a first embodiment, a metal layer disposed between layers of polyolefin.
  • the polyolefin may be LDPE, HDPE or any other suitable polyolefin.
  • the polyolefin must match the polyolefin used in the blank for seal integrity.
  • the metal layer is PET coated with metal such as aluminum (“metalized aluminum PET") .
  • the coating may be accomplished by blade coating, spray coating, or any other suitable method.
  • the metal layer can be a metal foil, such as aluminum foil or tin foil.
  • the seam tape with metal layer is applied to the underside of the blank and wrapped around the exposed edge prior to wrapping the blank around the mandrel .
  • the seam tape may be applied to the inside of the tubular container after the container has been formed.
  • EXAMPLE Single wrap straight seam cans were made from blanks comprising layers of HDPE, paper, LDPE, foil and HDPE. The exposed underlying wall edge was covered with either a first seam tape comprising a layer of 48 gauge PET interposed between layers of 18 lb/ream (8.16 kg/ream) LDPE or a second seam tape comprising 48 gauge metalized aluminum PET interposed between layers of 18 lb/ream (8.16 kg/ream) LDPE. Both sets of sealed cans were tested for oxygen migration with a Mocon, Inc. oxygen transmission analyzer.
  • the average level of oxygen migration in the first set of containers was 0.10 cc of oxygen per container per day.
  • the average level of oxygen migration in the second set of containers was 0.01 cc of oxygen per container per day.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)

Abstract

An improved seam tape (20) for protecting the underlying exposed edge of single wrap containers (10). The tape comprises a layer of metalized PET interposed between layers of LDPE. The seam tape is particularly useful on containers designed to hold products sensitive to oxygen and water.

Description

TITLE
METALIZED SEAM SEAL FOR SINGLE WRAP CONTAINER
BACKGROUND This patent relates to a single wrap container for holding foodstuffs or other oxygen or moisture sensitive products. More particularly, this patent relates to a single wrap container having a seam having an exposed underlying edge enclosed by tape having a metalized layer.
Single wrap containers, formed from a single ply of material, can be used to hold drink mixes, snacks and other foods. The single wrap container body typically is formed from a blank comprising layers of, from the inside out, polyolefin, paper stock, polyolefin, metal foil, polyolefin, printed paper and overlacquer. The blank is die cut to the desired silhouette and then formed into a tubular shape by wrapping it once around a mandrel . The overlapping ends of the blank form a straight seam. The seam has an underlying portion and an overlying portion.
The edge of the underlying portion of the seam, and therefore an edge of the paper layer, is exposed to the container contents. Air and moisture can migrate through the paper layer into or out of the container.
One solution to this problem involves covering the exposed edge of the blank with a strip of barrier tape. Such a solution is taught in Stahlecker U.S. Patent No. 5,620,135, wherein the underlying seam edge of the container is enclosed by a protective covering. In Stahlecker, the edge is less thick than the rest of the body wall so that the total thickness of the inner edge segment, including the protective covering, is approximately equal to that of the rest of the wall .
Known materials for protecting the raw edges of paperboard containers include low density polyethylene (LDPE) , ethylene vinyl alcohol copolymer (EVOH) , polyethylene terephthalate (PET) , glycol modified PET (PETG) , nylon, and combinations thereof.
The inventor made single wrap straight seam cans and covered the underlying body wall exposed edge with seam tape comprising a layer of PET interposed between LDPE layers. The sealed containers were tested for air migration levels and the resulting levels were unacceptably high (0.10 cc of oxygen per container per day) . What is needed is an improved side seam tape for preventing migration of air and moisture into or out of a sealed container.
SUMMARY OF THE INVENTION
The present invention is an improved seam tape for protecting the underlying exposed edge of single wrap containers. The tape comprises a layer of metalized PET interposed between layers of LDPE. The seam tape is especially useful with containers designed to hold products sensitive to oxygen and water.
DRAWINGS
Figure 1 is a perspective view of a single wrap blank formed into a tubular container.
Figure 2 is an enlarged partial sectional view of the single wrap container of Figure 1.
Figure 3 is an enlarged partial sectional view of the single wrap container of Figure 1 showing the seam tape of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Turning to the drawings, there is shown in Figure 1 a blank formed into a single wrap straight walled tubular container. The container 10 has a straight overlap seam 12 having an underlying portion 14 and an overlying portion 16. As best seen in Figure 2, the edge 18 of the underlying portion 14 is exposed to the inside contents of the container 10.
The blank used to form the single wrap container typically comprises layers of, from the inside out, polyolefin, paper stock, polyolefin, metal foil, polyolefin, printed paper and overlacquer. Usually the polyolefin layers are low density polyethylene (LDPE) , but any suitable polyolefin, including high density polyethylene (HDPE) , may be used. Because the tubular container has an exposed edge, air can migrate through the paper layer into the container and moisture from the contents can wick into the paper layer.
To prevent air from getting into the container and moisture from getting out, seam tape 20 can be used to cover the underlying exposed edge 18 of the container wall, as shown in Figure 3. Conventional seam tape comprises one or more layers of low density polyethylene (LDPE) , ethylene vinyl alcohol copolymer (EVOH) , polyethylene terephthalate (PET) , PETG, nylon, or combinations thereof. However, these materials may not be satisfactory in sealing the container edge.
The present invention is a seam tape comprising, in a first embodiment, a metal layer disposed between layers of polyolefin. The polyolefin may be LDPE, HDPE or any other suitable polyolefin. The polyolefin must match the polyolefin used in the blank for seal integrity. Preferably, the metal layer is PET coated with metal such as aluminum ("metalized aluminum PET") . The coating may be accomplished by blade coating, spray coating, or any other suitable method. Alternatively, the metal layer can be a metal foil, such as aluminum foil or tin foil.
To use, the seam tape with metal layer is applied to the underside of the blank and wrapped around the exposed edge prior to wrapping the blank around the mandrel . Alternatively, the seam tape may be applied to the inside of the tubular container after the container has been formed.
EXAMPLE Single wrap straight seam cans were made from blanks comprising layers of HDPE, paper, LDPE, foil and HDPE. The exposed underlying wall edge was covered with either a first seam tape comprising a layer of 48 gauge PET interposed between layers of 18 lb/ream (8.16 kg/ream) LDPE or a second seam tape comprising 48 gauge metalized aluminum PET interposed between layers of 18 lb/ream (8.16 kg/ream) LDPE. Both sets of sealed cans were tested for oxygen migration with a Mocon, Inc. oxygen transmission analyzer.
The average level of oxygen migration in the first set of containers (with the LDPE/PET/LDPE seam seal) was 0.10 cc of oxygen per container per day. The average level of oxygen migration in the second set of containers (with the seam seal of the present invention) was 0.01 cc of oxygen per container per day. These results demonstrate the superior barrier properties of a seam tape comprising a metal layer interposed between polyolefin layers. Other modifications and alternative embodiments of the invention are contemplated which do not depart from the scope of the invention as defined by the foregoing teachings and appended claims. It is intended that the claims cover all such modifications that fall within their scope.

Claims

I CLAIM AS MY INVENTION:
1. In a single wrap container (10) comprising a body wall, the wall formed from a blank having a barrier layer and a layer through which moisture and oxygen can migrate, the wall having a straight overlap seam (12) , the seam having an underlying portion (14) and an overlying portion (16) , the underlying portion having an exposed edge (18) , the exposed edge being covered by sealing tape (20) to minimize the migration of moisture and oxygen through the wall, the improvement comprising the sealing tape having a metal layer interposed between polyolefin layers.
2. The container of claim 1 wherein the metal layer is metalized aluminum PET.
3. The container of claim 2 wherein the polyolefin layer is LDPE.
4. The container of claim 1 wherein the layer through which moisture and oxygen can migrate comprises paper.
5. The container of claim 1 wherein the metal layer is metal foil.
6. The container of claim 5 wherein the metal foil is aluminum foil.
7. The container of claim 1 wherein the barrier layer comprises polyolefin and the polyolefin layers of the seam tape are made of the same polyolefin as the barrier layer.
PCT/US2003/010027 2002-06-12 2003-04-01 Metalized seam seal for single wrap container Ceased WO2003106277A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003223409A AU2003223409A1 (en) 2002-06-12 2003-04-01 Metalized seam seal for single wrap container

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US6411502A 2002-06-12 2002-06-12
US10/064,115 2002-06-12

Publications (1)

Publication Number Publication Date
WO2003106277A1 true WO2003106277A1 (en) 2003-12-24

Family

ID=29731563

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/010027 Ceased WO2003106277A1 (en) 2002-06-12 2003-04-01 Metalized seam seal for single wrap container

Country Status (2)

Country Link
AU (1) AU2003223409A1 (en)
WO (1) WO2003106277A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010135613A1 (en) 2009-05-21 2010-11-25 Meadwestvaco Corporation Hermetically sealed paperboard containers with enhanced barrier performance
WO2011146087A1 (en) 2010-05-21 2011-11-24 Meadwestvaco Corporation Hermetically-sealed paperboard containers with improved barrier performance
WO2012064478A1 (en) 2010-11-08 2012-05-18 Meadwestvaco Corporation Double wall barrier paperboard containers
US20170174385A1 (en) * 2015-12-17 2017-06-22 Peter NILLE Container and method for producing a container
WO2020036515A1 (en) * 2018-08-15 2020-02-20 Дмитрий Викторович САВЕЛЬЕВ Packaging

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795366A (en) * 1955-05-05 1957-06-11 American Can Co Dual purpose pull strip
US3819085A (en) * 1972-03-28 1974-06-25 American Can Co Lap side seam of metal, tubular body and method for making same
US4355756A (en) * 1979-10-25 1982-10-26 Mitsubishi Kasei Kogyo Kabushiki Kaisha Containers adapted to contain foodstuffs
US5203492A (en) * 1990-09-12 1993-04-20 Rundpack Ag Packing container
US5353985A (en) * 1991-02-04 1994-10-11 Alusuisse-Lonza Services Ltd. Package
US5620135A (en) * 1994-04-07 1997-04-15 Ruediger Haaga Gmbh Container

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795366A (en) * 1955-05-05 1957-06-11 American Can Co Dual purpose pull strip
US3819085A (en) * 1972-03-28 1974-06-25 American Can Co Lap side seam of metal, tubular body and method for making same
US4355756A (en) * 1979-10-25 1982-10-26 Mitsubishi Kasei Kogyo Kabushiki Kaisha Containers adapted to contain foodstuffs
US5203492A (en) * 1990-09-12 1993-04-20 Rundpack Ag Packing container
US5353985A (en) * 1991-02-04 1994-10-11 Alusuisse-Lonza Services Ltd. Package
US5620135A (en) * 1994-04-07 1997-04-15 Ruediger Haaga Gmbh Container

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010135613A1 (en) 2009-05-21 2010-11-25 Meadwestvaco Corporation Hermetically sealed paperboard containers with enhanced barrier performance
US8113416B2 (en) 2009-05-21 2012-02-14 Meadwestvaco Corporation Hermetically sealed paperboard container with enhanced barrier performance
US20120104078A1 (en) * 2009-05-21 2012-05-03 Zhiquan Yan Hermetically Sealed Paperboard Container with Enhanced Barrier Performance
US8448844B2 (en) * 2009-05-21 2013-05-28 Meadwestvaco Corporation Hermetically sealed paperboard container with enhanced barrier performance
EP2604539A1 (en) 2009-05-21 2013-06-19 MeadWestvaco Corporation Hermetically sealed paperboard containers with enhanced barrier performance
WO2011146087A1 (en) 2010-05-21 2011-11-24 Meadwestvaco Corporation Hermetically-sealed paperboard containers with improved barrier performance
WO2012064478A1 (en) 2010-11-08 2012-05-18 Meadwestvaco Corporation Double wall barrier paperboard containers
US20170174385A1 (en) * 2015-12-17 2017-06-22 Peter NILLE Container and method for producing a container
CN106892175A (en) * 2015-12-17 2017-06-27 Ptm 包装工具机器私人有限公司 Container and method for producing a container
US10589890B2 (en) 2015-12-17 2020-03-17 Ptm Packaging Tools Machinery Pte. Ltd. Container and method for producing a container
WO2020036515A1 (en) * 2018-08-15 2020-02-20 Дмитрий Викторович САВЕЛЬЕВ Packaging

Also Published As

Publication number Publication date
AU2003223409A1 (en) 2003-12-31

Similar Documents

Publication Publication Date Title
US4139643A (en) Snack food package
US6739500B1 (en) Container and method for making container for fragile products
US8113416B2 (en) Hermetically sealed paperboard container with enhanced barrier performance
US6302321B1 (en) Sealant layer for container lid
ES2221935T3 (en) UNFOLIATED CARTON POLYMER COATED TO PACKAGING FOOD AND NON-FOOD PRODUCTS.
AU679323B2 (en) Improvements in or relating to laminates and packaging materials
CA2362317C (en) Non-round composite container with inverse curvature
BR112019025938B1 (en) PRESSURE RESISTANT CONTAINER
US20050252952A1 (en) High-barrier liner for beaded composite can
CA2039764A1 (en) Packages with controlled easy-open features
US20120298733A1 (en) Hermetically Sealed Paperboard Container
EP2571772A1 (en) Hermetically-sealed paperboard containers with improved barrier performance
CA2705428C (en) Composite dough can recyclable as an all-paper product
US6230968B1 (en) Composite can and method of making same
WO2003106277A1 (en) Metalized seam seal for single wrap container
US20250033846A1 (en) Sealable card based container and blank therefor
WO1998001359A1 (en) A packaging container intended for the cold storage of liquid foods in ice or water
JP3179591B2 (en) Food packaging method
AU2022258781A1 (en) Can
JPH0655485B2 (en) Paperboard container and manufacturing method thereof
JPH05138828A (en) Paperboard container and its preparation
JPH11216821A (en) Packaging materials for paper containers and paper containers

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PH PL PT RO RU SC SD SE SG SK SL TJ TM TN TR TT TZ UA UG UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP