WO1999023000A1 - Sac a parois multiples - Google Patents

Sac a parois multiples Download PDF

Info

Publication number
WO1999023000A1
WO1999023000A1 PCT/AU1998/000908 AU9800908W WO9923000A1 WO 1999023000 A1 WO1999023000 A1 WO 1999023000A1 AU 9800908 W AU9800908 W AU 9800908W WO 9923000 A1 WO9923000 A1 WO 9923000A1
Authority
WO
WIPO (PCT)
Prior art keywords
sack
top end
closed
tearing means
cover sheet
Prior art date
Application number
PCT/AU1998/000908
Other languages
English (en)
Inventor
Larry Thomas Challis
Original Assignee
Amcor Packaging (Australia) Pty. Ltd.
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
Priority claimed from AUPP0124A external-priority patent/AUPP012497A0/en
Priority claimed from AUPP2257A external-priority patent/AUPP225798A0/en
Application filed by Amcor Packaging (Australia) Pty. Ltd. filed Critical Amcor Packaging (Australia) Pty. Ltd.
Priority to AU10118/99A priority Critical patent/AU760523B2/en
Priority to JP2000518889A priority patent/JP4271848B2/ja
Priority to NZ504326A priority patent/NZ504326A/xx
Publication of WO1999023000A1 publication Critical patent/WO1999023000A1/fr

Links

Classifications

    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/66—Inserted or applied tearing-strings or like flexible elements
    • 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
    • B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52—Details
    • B65D75/58—Opening or contents-removing devices added or incorporated during package manufacture
    • 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

Definitions

  • the present invention relates to a multi-wall sack.
  • multi-wall sack is understood to mean a sack that has :
  • each wall is formed from paper, polymeric, or any other suitable material
  • the walls may be adhered together so that the sack is a single multi-wall bag or may be separate (or partly adhered together and partly separate) so that the sack includes an outer bag and one or more inner bags positioned in the outer bag.
  • the present invention relates particularly, although by no means exclusively, to a multi-wall sack which includes a single or multi-wall outer bag, typically formed from paper, and an inner pouch, typically formed from a polymeric material.
  • sacks are suitable for storing a wide range of products including dry food products, such as powdered milk products.
  • a strong outer bag (usually having two or more walls of paper) is also necessary to protect the inner pouch and to facilitate handling and identification of the enclosed goods.
  • Known multi-wall paper/polymeric material sacks for dry food products comprise an inner polyethylene pouch and an outer paper bag having either a block (ie, rectangular) bottom end or a "pinch” (ie. flat, folded over) bottom end.
  • Some known multi-wall paper/polymeric material sacks are manufactured with an "easy-open” tearing feature at their bottom end to facilitate the easy opening of the outer paper bags of the sacks, without the use of a sharp instrument, so as to enable the inner polymeric pouches to be removed from the bags.
  • These easy-open tearing features are incorporated into cover sheets (often referred to as patches) that are glued onto and thereby cover the folded bottom ends of the outer paper bags during manufacture of the sacks .
  • cover sheets often referred to as patches
  • Such sacks are sold to manufacturers of the food products with an open-top ready for filling with the food products and then closing by the "pinching" method to form a pinch-top end or by stitching to make a stitched top end. These last closure steps are completed by the food products manufacturer.
  • the cover sheet incorporating the easy-open tear feature on the base of the block-bottom sack must be carefully positioned to ensure that the tear-strip is correctly aligned with the underlying edge of the folded bag end. If not correctly aligned, it is not possible to open the bottom of the outer paper bag without the use of a sharp instrument .
  • the control of the sack manufacturing operation required to ensure correct positioning of the easy-open cover sheets adds significantly to the cost of manufacture of the sacks .
  • This object extends not only to known paper/polymeric material multi-wall sacks discussed above but also extends to other sacks, including single multi- wall bags that are within the above definition of "multi- wall” sack.
  • a multi-wall sack which includes:
  • the above-described easy-open sack is less complex to manufacture than the known easy-open paper/polymeric material multi-wall sacks described above, is more effective in opening the sack, and is less costly to manufacture.
  • the closed top end may be of any suitable configura ion.
  • the closed top end may be a pinch-top end.
  • the closed top end may be a stitched top end, a stitched/folded top end or a folded/stitched top end that are used for flour sacks .
  • tearing means is to be construed as referring to any flexible elongate element suitable for tearing the sack, such as a string, strip, ribbon or rope.
  • the tearing means may be integrally formed as part of an outer wall of the sack or may be affixed to or otherwise positioned in relation to the outer wall and become part of the closed top end when that end is formed.
  • the tearing means may form part of a cover sheet formed from paper or other suitable material .
  • the cover sheet is affixed to the sack in a location that is selected so that the tearing means becomes part of the closed top end as sections of the sack at the open top end are folded to form the closed end.
  • the sack is pre-cut and folded with a predetermined design at the open top end and the cover sheet is glued to an outer wall of the sack in a location that is selected so that the tearing means can be part of the closed top end of the sack.
  • the tearing means form part of a cover sheet that has a first cover sheet section on one side of the tearing means and a second cover sheet section on the other side of the tearing means.
  • the first section of the cover sheet be affixed, typically glued, to an outer wall of the sack in a position that is selected so that the top end of the sack can be folded over onto the second section of the cover sheet and affixed, typically by gluing and/or stitching and/or by any other suitable means to the second section in the process of forming the closed top end.
  • the sack includes;
  • the inner pouch and the outer bag may be formed from any suitable material .
  • the inner pouch is formed from a polymeric material.
  • the outer bag is formed from paper.
  • the outer bag comprises a plurality of layers of paper.
  • the outer bag is formed with a block end .
  • a method for forming a closed multi-wall sack which includes the steps of:
  • the above-described method may include stitching closed the open end of the filled sack prior to step (ii) .
  • a method for manufacturing a multi-wall sack which includes the steps of:
  • the closed top end is formed in step (ii) by folding the sack at the open top end.
  • the open top end formed in step (i) is pre-cut and folded to permit the formation of the closed top end.
  • the closed top end may be of any suitable configuration, such as a pinched top end, a stitched top end, a stitched/folded top end, or a folded/stitched top end.
  • the tearing means is attached to the sack by adhering the tearing means to an outer wall of the sack at the open top end so that it extends laterally of the open top end.
  • the tearing means forms part of a cover sheet which includes a first cover sheet section on one side on the tearing means and a second cover sheet section on the other side of the tearing means and the tearing means is affixed to the sack by adhering the first section to the outer wall of the sack.
  • a multi-wall sack filled with product which sack includes a closed bottom end and a closed top end with a tearing means that facilitates easy opening of the sack at the top end.
  • Figure 1 is a perspective view of a multi-wall sack in accordance with one embodiment of the invention in the as-manufactured form;
  • Figure la is an enlarged view of the circled region in Figure 1;
  • Figure lb is a cross-section along the line lb-lb in Figure la;
  • Figure lc is a cross-section similar to Figure lb but showing the sack after it has been filled with product and closed with a pinch-top end;
  • Figure 2 is a perspective view of the sack shown in Figure 1 after the sack has been filled with a product, such as flour, and the open top end has been closed by folding the sack to form a pinch-top end;
  • Figure 3 is a side elevation of a multi-wall sack in accordance with another embodiment of the invention;
  • Figure 4 is a perspective view of the sack shown in Figure 3 after the sack has been filled with a product and before the sack is folded at the open top end to form a pinched-top end;
  • Figure 5 is a perspective view of the sack shown in Figure 4 after the pinch-top end has been formed
  • Figures 6 to 9 are side elevations which illustrate the manufacture of a sack of a second embodiment of the invention.
  • Figures 8 to 12 are side elevations of the sack shown in Figure 9 which illustrate the sequence of steps to open the outer bag and remove the inner sack.
  • Figures 1 and 2 show an embodiment of a multi- wall sack 1 in an as-manufactured form. In this form the sack is essentially pressed flat.
  • the sack has inner and outer paper walls 21a, 21b that are adhered together, a block bottom end 2, and an open top end.
  • the open top end is designed to form a pinch-top end 28 ( Figure 2) which closes the sack 1.
  • the sack 1 includes a line of melt adhesive 26 on the inner faces of the walls 21a, 21b which extends across one side of the flattened sack 1 at the open top end.
  • the present invention is not limited to forming a pinch-top end and extends to any suitable closed top end.
  • the present invention extends to stitched/folded and folded/stitched top ends that are used on flour sacks .
  • the as- manufactured form of the sack 1 further includes a paper cover sheet 22 that is glued to the outer face of the wall 21a on the other side of the flattened sack 1 to the side on which the melt adhesive 26 is applied.
  • the cover sheet includes a tear strip 24 which divides the cover sheet into a lower cover sheet section 22a and an upper cover sheet section 22b.
  • the lower section 22a is glued to the sack 1.
  • the position of the cover sheet 22 is selected so that in use, when the pinch-top end is formed by folding over the sections of the walls 21a, 21b at the open end of the sack 1 in the direction of the arrows shown in Figures 1 and lb, the line of melt adhesive 26 is brought into contact with and can adhere to the outer face of the upper section 22b of the cover sheet 22 above the tear strip 24.
  • the sack 1 is closed by the steps of :
  • the pinch-top may be opened by removing the tear strip 24 and pulling upwardly (as viewed in Figure lc) the upper section 22b of the cover sheet. This action unfolds the pinch-top end and allows direct access to the contents of the sack 1.
  • the embodiments of a multi-wall sack 1 shown in Figures 3 to 12 are formed with an inner pouch of polymeric material and an outer multi-layer bag formed from paper.
  • the outer bag of the sack 1 may include either a block bottom end 1, as illustrated in Figures 3-5, or a pinch- bottom end 2, as illustrated in Figures 6-12.
  • the embodiment of the sack 1 shown in Figures 3 to 5 is manufactured by:
  • the embodiments of the closed sack, shown in Figures 2 and 5 have easy-open features at the top ends, which are simple to access, simple to operate, and simple to position during manufacture compared with the known block-base tearing strip. Furthermore, the sacks in accordance with these embodiments are less costly to manufacture than known sacks with block-base tearing strips .
  • FIG. 6 An alternative method of manufacturing a multi- wall sack having an easy-open tearing feature in the top end of the sack as illustrated in Figures 6 to 9.
  • the sack (a pinch-bottom sack) is filled with product to form a filled sack.
  • the plastic ribbon 4 is inserted during the closing step into the fold so that it will be retained in the pinch-top end when the pinch-top end is adhered closed.
  • the inner pouch of product can be removed from either of the bags by pulling on the plastic ribbon 4 to tear open the overlying layers of paper. The sack is then inverted to allow the inner pouch 5 to be removed.

Abstract

L'invention concerne un sac (1) à parois multiples. Le sac à parois multiples comprend un fond fermé (2) et une partie supérieure ouverte qui, lorsqu'elle est fermée, forme une partie supérieure fermée munie d'un dispositif de rupture (22) qui rend l'ouverture du sac plus aisée.
PCT/AU1998/000908 1997-11-03 1998-11-02 Sac a parois multiples WO1999023000A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU10118/99A AU760523B2 (en) 1997-11-03 1998-11-02 A multi-wall sack
JP2000518889A JP4271848B2 (ja) 1997-11-03 1998-11-02 多層袋
NZ504326A NZ504326A (en) 1997-11-03 1998-11-02 A multi-wall sack with string tear means in the top

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPP0124A AUPP012497A0 (en) 1997-11-03 1997-11-03 A multi-wall sack
AUPP0124 1997-11-03
AUPP2257A AUPP225798A0 (en) 1998-03-10 1998-03-10 A multi-wall sack
AUPP2257 1998-03-10

Publications (1)

Publication Number Publication Date
WO1999023000A1 true WO1999023000A1 (fr) 1999-05-14

Family

ID=25645643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1998/000908 WO1999023000A1 (fr) 1997-11-03 1998-11-02 Sac a parois multiples

Country Status (5)

Country Link
JP (1) JP4271848B2 (fr)
CN (1) CN1112307C (fr)
MY (1) MY121749A (fr)
NZ (1) NZ504326A (fr)
WO (1) WO1999023000A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007513028A (ja) * 2003-12-09 2007-05-24 アンカー リミティド ばら包装の多層袋とその多層袋の製造装置
US8814430B2 (en) 2010-02-23 2014-08-26 Kraft Foods R&D, Inc. Food package having opening feature
CN104918767A (zh) * 2012-10-25 2015-09-16 格拉德产品公司 具有金属外观的热塑性多层膜

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7344022B2 (en) * 2006-04-07 2008-03-18 Madson Products, Llc Foldable utility receptacle and method
CN103303613A (zh) * 2013-06-13 2013-09-18 铜陵方正塑业科技有限公司 一种航空清洁袋及其制作方法
CN108249024A (zh) * 2016-12-29 2018-07-06 上海艾录包装股份有限公司 一种新型易开口的复合包装袋

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117351A (en) * 1982-03-22 1983-10-12 Nigel Ervine Claxton Re-closable bags and the production thereof
GB2132170A (en) * 1982-12-21 1984-07-04 Lin Pac Containers Int Easy-open sack
GB2135651A (en) * 1983-02-18 1984-09-05 Kanari Tani Easy-to-open synthetic resin bag and apparatus for the manufacture thereof
FR2577896A1 (fr) * 1985-02-22 1986-08-29 Morin Raymond Sa Emballage etanche multi-couches muni d'un dispositif d'ouverture controlee, procede de fabrication d'un tel emballage et dispositif pour la mise en oeuvre de ce procede
GB2216867A (en) * 1988-03-18 1989-10-18 Ward Sacks Limited Sacks
US5094863A (en) * 1990-01-24 1992-03-10 James River Corporation Of Virginia Food package with rip-cord opener
EP0630822A1 (fr) * 1993-06-25 1994-12-28 The Procter & Gamble Company Poche pourvue de nervures
US5662420A (en) * 1995-04-12 1997-09-02 Astro-Valcour, Incorporated Cushioned macerated paper dispatch package

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117351A (en) * 1982-03-22 1983-10-12 Nigel Ervine Claxton Re-closable bags and the production thereof
GB2132170A (en) * 1982-12-21 1984-07-04 Lin Pac Containers Int Easy-open sack
GB2135651A (en) * 1983-02-18 1984-09-05 Kanari Tani Easy-to-open synthetic resin bag and apparatus for the manufacture thereof
FR2577896A1 (fr) * 1985-02-22 1986-08-29 Morin Raymond Sa Emballage etanche multi-couches muni d'un dispositif d'ouverture controlee, procede de fabrication d'un tel emballage et dispositif pour la mise en oeuvre de ce procede
GB2216867A (en) * 1988-03-18 1989-10-18 Ward Sacks Limited Sacks
US5094863A (en) * 1990-01-24 1992-03-10 James River Corporation Of Virginia Food package with rip-cord opener
EP0630822A1 (fr) * 1993-06-25 1994-12-28 The Procter & Gamble Company Poche pourvue de nervures
US5662420A (en) * 1995-04-12 1997-09-02 Astro-Valcour, Incorporated Cushioned macerated paper dispatch package

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007513028A (ja) * 2003-12-09 2007-05-24 アンカー リミティド ばら包装の多層袋とその多層袋の製造装置
CN1890158B (zh) * 2003-12-09 2011-05-25 安可有限公司 散装多层袋和制造该袋的装置
US8814430B2 (en) 2010-02-23 2014-08-26 Kraft Foods R&D, Inc. Food package having opening feature
CN104918767A (zh) * 2012-10-25 2015-09-16 格拉德产品公司 具有金属外观的热塑性多层膜

Also Published As

Publication number Publication date
MY121749A (en) 2006-02-28
NZ504326A (en) 2003-04-29
CN1112307C (zh) 2003-06-25
CN1283160A (zh) 2001-02-07
JP2001521863A (ja) 2001-11-13
JP4271848B2 (ja) 2009-06-03

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