EP0974450A2 - Sac à fenêtre et son procédé de production - Google Patents

Sac à fenêtre et son procédé de production Download PDF

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Publication number
EP0974450A2
EP0974450A2 EP99305853A EP99305853A EP0974450A2 EP 0974450 A2 EP0974450 A2 EP 0974450A2 EP 99305853 A EP99305853 A EP 99305853A EP 99305853 A EP99305853 A EP 99305853A EP 0974450 A2 EP0974450 A2 EP 0974450A2
Authority
EP
European Patent Office
Prior art keywords
bag
laminated
window
sheet
bags
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.)
Withdrawn
Application number
EP99305853A
Other languages
German (de)
English (en)
Other versions
EP0974450A3 (fr
Inventor
Timothy Law
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.)
Gala International Group
Original Assignee
Gala International Group
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 Gala International Group filed Critical Gala International Group
Publication of EP0974450A2 publication Critical patent/EP0974450A2/fr
Publication of EP0974450A3 publication Critical patent/EP0974450A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/82—Forming or attaching windows
    • B31B70/826—Forming or attaching windows involving applying window patches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2155/00—Flexible containers made from webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/10—Shape of flexible containers rectangular and flat, i.e. without structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2170/00—Construction of flexible containers
    • B31B2170/20—Construction of flexible containers having multi-layered walls, e.g. laminated or lined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/82—Forming or attaching windows

Definitions

  • This invention relates to bags and a method of manufacture thereof, and particularly, but not exclusively, to laminar bags having at least one window therein.
  • Such bags especially bags made of paper laminated to plastics material, have a number of applications, for example they can be used to carry foodstuffs.
  • they can be used to carry foodstuffs such as roast chicken, the plastics material preventing juices or other liquids from the food leaking from the bag.
  • Conventional laminar bags are thermally-sealed, laminated, satchel-type bags and are optically opaque. They do not provide any means, such as a transparent window, by which the product within the bag may be viewed. It is, however, desirable to be able to inspect the condition of the product within the bag without opening it, by, for example, providing an aperture-type window in the bag.
  • Envelopes/bags with windows are known, and are typically manufactured by cutting a window in the envelopes/bags and attaching a layer of transparent material to the inner surface of the envelopes/bags to form a seal over the window.
  • a layer of transparent material to the inner surface of the envelopes/bags to form a seal over the window.
  • difficulty has been encountered in attaching the transparent material to the laminated surface.
  • Such products are also not thermally sealed and would not prevent fluids from leaking out of them.
  • a method of manufacturing a bag comprising the steps of:
  • the first material may comprise a sheet of paper.
  • the paper sheet may be coloured, for example brown or white, and/or may have printed matter provided thereon.
  • the weight of the paper may be in the range 10 gm -2 to 180 gm -2 .
  • the or each window may be formed by cutting the sheet of material, preferably by rotary die cutting.
  • the second material may be a plastic material, for example polypropylene, low density polyethylene, high density polyethylene, or polyester or combinations of such materials.
  • the second material may be attached to the first material by means of an adhesive, or by heat-welding.
  • the bag may be formed using heat sealing, or the like.
  • the second material is attached in use to an inner surface of the bag.
  • the second material may be laminated to the whole area of the inner surface of the bag, thereby providing a substantially leak-proof bag.
  • a continuous web of the first material may be formed, which may have windows formed therein at intervals there-along.
  • the continuous web may then be laminated to a continuous web of the second material, and a number of bags may be formed from the continuous laminated web, each bag having at least one window therein.
  • the method may further comprise the steps of laminating a third material to the first material and/or the second material, and forming a bag from the laminated, windowed material thus formed.
  • the method may comprise another step of laminating a fourth material to the first material, or the second material or the third material or a combination of these materials, and forming a bag from the laminated, windowed material thus formed.
  • Subsequent materials may be added in still further steps, forming a multi-layered, laminated, windowed material.
  • the third, fourth and subsequent materials may be a plastic material, or paper, providing always that a transparent window is provided in the laminated, windowed material.
  • a bag manufactured by the method of the first aspect of the invention.
  • the bag may be provided with a seam and a base which may be heat-sealed.
  • the bag may be provided with one or more gussets.
  • the bag may be substantially rectangular in shape.
  • the bag may conveniently have a width of 80 mm and a length of 170 mm, or a width of 300 mm and a length of 900 mm.
  • the figure shows a paper bag 1 of substantially rectangular shape, having a front surface 2, a back surface (not shown), a first side surface 3 and a second side surface (not shown).
  • the back surface incorporates a seam.
  • Each side surface has two folded portions 4 and 5, which form a gusset.
  • the bottom of the bag is folded to form a base 6, and the top 7 of the bag is provided with an opening, to allow articles, for example food, to be placed in the bag.
  • a window 8 is formed in the front surface 2.
  • the inner surface of the bag is provided with a layer of polypropylene laminated thereto.
  • the bag is manufactured using the method according to the first aspect of the invention.
  • a sheet of paper is formed, and die cut to form a window therein.
  • a sheet of polypropylene of the same size as the sheet of paper is then laminated to the inner surface of the paper sheet, such that the polypropylene sheet seals around the edges of the window.
  • the laminated sheet is passed into a bag-forming machine which forms the laminated sheet into a bag as described above, heat sealing the bottom and back seam of the bag to form a substantially leak-proof bag.
  • bag may be formed by the above method, and that the present invention is not limited to rectangular side-gusseted, satchel-type bags, but also includes, for example, block bottom-type bags.
  • a number of such bags may be formed in the same process, by forming a web of paper, die cutting this to form windows therein at intervals there-along, laminating a web of polypropylene to one surface of the paper web such that the polypropylene seals around the edges of the windows, cutting the laminated web into lengths, and passing the lengths into a bag-forming machine which forms bags as described above.

Landscapes

  • Making Paper Articles (AREA)
  • Bag Frames (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
EP99305853A 1998-07-23 1999-07-23 Sac à fenêtre et son procédé de production Withdrawn EP0974450A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9815991.6A GB9815991D0 (en) 1998-07-23 1998-07-23 Bags and a method of manufacture thereof
GB9815991 1998-07-23

Publications (2)

Publication Number Publication Date
EP0974450A2 true EP0974450A2 (fr) 2000-01-26
EP0974450A3 EP0974450A3 (fr) 2000-04-26

Family

ID=10835999

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99305853A Withdrawn EP0974450A3 (fr) 1998-07-23 1999-07-23 Sac à fenêtre et son procédé de production

Country Status (2)

Country Link
EP (1) EP0974450A3 (fr)
GB (2) GB9815991D0 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9498930B2 (en) 2006-07-12 2016-11-22 Genpak Lp Packaging roll stock with windows
CN108481818A (zh) * 2018-03-26 2018-09-04 涿州皓原箔业有限公司 一种耐温透明窗铝箔袋及其制作方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1367627A (en) * 1971-12-02 1974-09-18 Masson Scott Thrissell Eng Ltd Wrappers for tramophone records
US5410857A (en) * 1994-04-20 1995-05-02 Vitex Packaging, Inc. Process for making windowed form, fill and seal bags
IT1275612B1 (it) * 1995-09-28 1997-10-14 Policarta Srl Macchina e procedimento per realizzare un nastro composito continuo per la produzione di involucri per prodotti alimentari e nastro ed
GB2309026B (en) * 1996-01-12 2000-05-10 Monge Fernon Maurice De Improvements relating to packaging

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9498930B2 (en) 2006-07-12 2016-11-22 Genpak Lp Packaging roll stock with windows
CN108481818A (zh) * 2018-03-26 2018-09-04 涿州皓原箔业有限公司 一种耐温透明窗铝箔袋及其制作方法

Also Published As

Publication number Publication date
GB9917243D0 (en) 1999-09-22
GB9815991D0 (en) 1998-09-23
GB2339718A (en) 2000-02-09
EP0974450A3 (fr) 2000-04-26

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