EP1901970A1 - Tear fold - Google Patents

Tear fold

Info

Publication number
EP1901970A1
EP1901970A1 EP06821063A EP06821063A EP1901970A1 EP 1901970 A1 EP1901970 A1 EP 1901970A1 EP 06821063 A EP06821063 A EP 06821063A EP 06821063 A EP06821063 A EP 06821063A EP 1901970 A1 EP1901970 A1 EP 1901970A1
Authority
EP
European Patent Office
Prior art keywords
film material
folds
film
packaging
extra
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Withdrawn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
EP06821063A
Other languages
German (de)
French (fr)
Inventor
Eddy Daelmans
Wojciech Skalbani
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.)
Amcor Specialty Cartons Switzerland GmbH
Original Assignee
Amcor Rentsch Rickenbach AG
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 Amcor Rentsch Rickenbach AG filed Critical Amcor Rentsch Rickenbach AG
Publication of EP1901970A1 publication Critical patent/EP1901970A1/en
Withdrawn legal-status Critical Current

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
    • B65D75/5827—Tear-lines provided in a wall portion
    • B65D75/5833—Tear-lines provided in a wall portion for tearing out a portion of the wall
    • B65D75/5844—Tear-lines provided in a wall portion for tearing out a portion of the wall the portion of the wall being a narrow strip, e.g. between lines of weakness

Definitions

  • the present invention relates to a film packaging which includes means for facilitating its opening, as well as methods for making such film packaging.
  • Flexible polymeric films are widely used as packaging materials for a vast range of goods.
  • a variety of synthetic polymers may be used as packaging materials, for example films made from synthetic polymers such as polyolefins (e.g. polyethylene and/or polypropylene), polystyrene and/or polyesters; and/or films made from natural polymers such as cellulosic materials and/or other biopolymers (e.g. polylactic acid) .
  • One particular packaging use for such films is as an overwrap for a variety of goods, for example for cigarette packets, compact discs, video tapes, foodstuffs etc., the films being sealed tightly over the goods.
  • the very properties which confer desirable properties on the films as packaging materials for example high strength and tear resistance, make such packages difficult to open because the films of which they are made are difficult to tear.
  • tear tapes In order to facilitate the opening of such packages, so-called “tear tapes” have been provided which consist of a narrow strip of a polymeric film adhered to the internal surface of the packaging film, a tab of the tear tape being left free on the outside of package to facilitate its opening. The package can then be opened by pulling the tear tape through the packaging film.
  • Another method proposed to open a package wrapped in film is to provide inherent in the film one or more lines of weakness on the film.
  • Two lines are generally preferred to define a film strip of sufficient width so a free tab end attached thereto can be easily grasped and pulled.
  • the tab is pulled to tear the film completely around the pack along both lines of weakness to remove the strip which severs the film and hence opens the pack.
  • Lines of weakness on the film have advantages over use of a separate tear tape as they are integral to the film and do not require additional processing steps or extra material.
  • a tear tape increases the thickness of the film where it is added resulting in an uneven film surface which can be difficult to seal evenly, thus reducing the seal integrity of a package overwrapped with such film.
  • the mechanical properties desired for a separate tear tape are different from those required for an overwrap film. So the tear tape and film are often made from different, incompatible materials which can also make it difficult to provide a good heat seal in regions of the pack where the overwrap film is adjacent the tear tape.
  • Lines of weakness on a film can be made by any suitable methods for example by mechanical scoring (e.g. with a controlled blade or roller to applies pressure to the film surface), by cut or scored perforations, by non contact means such as laser or other radiation to ablate and/or burn off film material (e.g. as described in U.S. Pat. No. 3,909,582; U.S. Pat. No. 5,630,308 (both American Can) or U.S. Pat. No. 5,010,325 and U.S. Pat. No. 5,010,231 (both
  • Tear tapes and tear lines can be a good and efficient way of opening such packages, they have significant disadvantages. Tear tapes require additional processing steps and extra material, and can be an obstacle to heat sealing. Tear lines require sophisticated cutting tools or methods allowing to weaken the material without compromising an efficient packaging function.
  • Fig. 1 Aerial view of an embodiment of the film packaging according to the invention.
  • Fig. 2 Side view of an embodiment of the film packaging according to the invention.
  • Fig. 3 Aerial view of an embodiment of the film packaging according to claim 10.
  • Fig. 4 Aerial view of an embodiment of the film packaging according to claim 12.
  • Fig. 5 Side view of an embodiment of the film packaging according to claims 10 to 12.
  • Fig. 6 Aerial view of an embodiment of the film packaging according to claim 14.
  • Fig. 7 Aerial view of an embodiment of the film packaging according to claim 16.
  • the present invention provides a film packaging (1) comprising opening means, characterized in that said opening means are constituted from at least two parallel folds (4),(4') in the film material, and in that at least two of the overlapping layers (2), (2')of said film material formed by said folds are bound together.
  • Said film material may be made of any synthetic or non synthetic polymer known in the prior art, such as polyolefins (e.g. polyethylene and/or polypropylene), polystyrene and/or polyesters, cellulosic materials and/or other biopolymers (e.g. polylactic acid) .
  • polyolefins e.g. polyethylene and/or polypropylene
  • polystyrene and/or polyesters e.g. polystyrene and/or polyesters
  • cellulosic materials e.g. polylactic acid
  • the opening means according to the invention are constituted from two parallel folds (4), (4') in the film material, which requires a minimal amount of additional film material (additional amount estimated to approximately 2%) .
  • the present invention also provides opening means constituted from more than two parallel folds .
  • the bound overlapping layers (2) , (2 ' ) , (2 ' ' ) of the film material are bound together by heat.
  • the bound overlapping layers (2), (2 1 ) (2") of the film material may also be bound together by a bonding material, such as glue or any other appropriate bonding material from the prior art .
  • the packaging material according to the invention may also include means aiming to facilitate the initiation of the tearing.
  • said means for initiating the tearing are located at or near the edge (5) of the film material sheet used for the packaging.
  • said means for initiating the tearing is a cut made in the bound overlapping layers of the film material, or in all the overlapping layers (2), (2 ' ) , (2 1 ') of the film material.
  • said cut can be made according to a pattern selected from a group of cut patterns comprising a linear cut which is oblique relative to the axis of the folds, a two-edged triangular cut whose tip is pointing in the axis of the folds, a cut forming a tab pointing in the axis of the folds, a s-shaped cut whose general direction corresponds to the axis of the folds, and a zigzag cut whose general direction corresponds to the axis of the folds.
  • any other appropriate cut pattern may be used.
  • the film material sheet used for the film packaging is cut so as to leave a surface of extra film material (6) in the area of the parallel folds, said surface of extra film material (6) constituting a tab for initiating the tearing.
  • said film packaging (1) is characterized in that it comprises four parallel folds (4) , (4 ' ) , (4 ' ' ) , (4 ' ' ' ) in the film material, in that the second of said folds (4') corresponds to one edge of said surface of extra film material (6), and in that the third of said folds (4 ' ' ) corresponds to the other edge of said surface of extra film material (6) .
  • said surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval. However, any other suitable shape may be used.
  • said film packaging (1) is characterized in that it comprises four parallel folds (4) , (4 ' ) , (4 ' ' ) , (4 ' ' ' ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the fourth of said folds (4 ' ' ' ) corresponds to the other edge of said surface of extra film material (6) .
  • said film packaging (1) is characterized in that it comprises two parallel folds (4), (4 1 ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the second of said folds (4 ' ) extends through said surface of extra film material (6) until it reaches the outer edge (3) of said surface.
  • the film packaging (1) may also be characterized in that said surface of extra film material (6) attaches to the film material sheet on a distance twice as long as the distance between the two parallel folds, and in that said surface of extra film material (6) has a symmetrical shape divided in two equal parts by the second of said parallel folds.
  • the tab resulting from said folded surface of extra film material may have a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval. However, any other suitable shape may be used.
  • said film packaging (1) is characterized in that it comprises two parallel folds (4), (4 ' ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the second of said folds (4 ' ) corresponds to the other edge of said surface of extra film material (6) .
  • said surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval. However, any other suitable shape may be used.
  • any other appropriate means for initiating the tearing may be used.

Landscapes

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

Abstract

Film packaging (1) comprising opening means, characterized in that said opening means are constituted from at least two parallel folds (4),(4') in the film material, and in that at least two of the overlapping layers (2),(2') of said film material formed by said folds are bound together.

Description

TEAR FOLD
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a film packaging which includes means for facilitating its opening, as well as methods for making such film packaging.
2. Description of the Prior Art
Flexible polymeric films are widely used as packaging materials for a vast range of goods. A variety of synthetic polymers may be used as packaging materials, for example films made from synthetic polymers such as polyolefins (e.g. polyethylene and/or polypropylene), polystyrene and/or polyesters; and/or films made from natural polymers such as cellulosic materials and/or other biopolymers (e.g. polylactic acid) .
One particular packaging use for such films is as an overwrap for a variety of goods, for example for cigarette packets, compact discs, video tapes, foodstuffs etc., the films being sealed tightly over the goods. However, the very properties which confer desirable properties on the films as packaging materials, for example high strength and tear resistance, make such packages difficult to open because the films of which they are made are difficult to tear.
In order to facilitate the opening of such packages, so- called "tear tapes" have been provided which consist of a narrow strip of a polymeric film adhered to the internal surface of the packaging film, a tab of the tear tape being left free on the outside of package to facilitate its opening. The package can then be opened by pulling the tear tape through the packaging film.
Another method proposed to open a package wrapped in film is to provide inherent in the film one or more lines of weakness on the film. Two lines are generally preferred to define a film strip of sufficient width so a free tab end attached thereto can be easily grasped and pulled. To open the pack the tab is pulled to tear the film completely around the pack along both lines of weakness to remove the strip which severs the film and hence opens the pack.
Lines of weakness on the film have advantages over use of a separate tear tape as they are integral to the film and do not require additional processing steps or extra material. A tear tape increases the thickness of the film where it is added resulting in an uneven film surface which can be difficult to seal evenly, thus reducing the seal integrity of a package overwrapped with such film. The mechanical properties desired for a separate tear tape are different from those required for an overwrap film. So the tear tape and film are often made from different, incompatible materials which can also make it difficult to provide a good heat seal in regions of the pack where the overwrap film is adjacent the tear tape.
Lines of weakness on a film can be made by any suitable methods for example by mechanical scoring (e.g. with a controlled blade or roller to applies pressure to the film surface), by cut or scored perforations, by non contact means such as laser or other radiation to ablate and/or burn off film material (e.g. as described in U.S. Pat. No. 3,909,582; U.S. Pat. No. 5,630,308 (both American Can) or U.S. Pat. No. 5,010,325 and U.S. Pat. No. 5,010,231 (both
LPF) ) ; by use of a laser to scramble orientation along a line on the oriented film without ablating the film surface
(as described in the applicant's co-pending application PCT/EP02/00075) ; and/or by the methods described in WO
01/15594 (Hoechst) or WO 01/94098 (University of Warwick) .
Although tear tapes and tear lines can be a good and efficient way of opening such packages, they have significant disadvantages. Tear tapes require additional processing steps and extra material, and can be an obstacle to heat sealing. Tear lines require sophisticated cutting tools or methods allowing to weaken the material without compromising an efficient packaging function.
Therefore, there is a need for a film packaging with opening means which does not require additional tape material or sophisticated cutting tools or methods.
DESCRIPTION OF THE DRAWINGS
Fig. 1: Aerial view of an embodiment of the film packaging according to the invention. Fig. 2: Side view of an embodiment of the film packaging according to the invention.
Fig. 3: Aerial view of an embodiment of the film packaging according to claim 10.
Fig. 4: Aerial view of an embodiment of the film packaging according to claim 12.
Fig. 5: Side view of an embodiment of the film packaging according to claims 10 to 12.
Fig. 6: Aerial view of an embodiment of the film packaging according to claim 14.
Fig. 7 Aerial view of an embodiment of the film packaging according to claim 16.
DESCRIPTION OF THE INVENTION
The present invention provides a film packaging (1) comprising opening means, characterized in that said opening means are constituted from at least two parallel folds (4),(4') in the film material, and in that at least two of the overlapping layers (2), (2')of said film material formed by said folds are bound together.
Said film material may be made of any synthetic or non synthetic polymer known in the prior art, such as polyolefins (e.g. polyethylene and/or polypropylene), polystyrene and/or polyesters, cellulosic materials and/or other biopolymers (e.g. polylactic acid) .
Preferably, the opening means according to the invention are constituted from two parallel folds (4), (4') in the film material, which requires a minimal amount of additional film material (additional amount estimated to approximately 2%) . Notwithstanding, the present invention also provides opening means constituted from more than two parallel folds .
Preferably, the bound overlapping layers (2) , (2 ' ) , (2 ' ' ) of the film material are bound together by heat. Notwithstanding, the bound overlapping layers (2), (21) (2") of the film material may also be bound together by a bonding material, such as glue or any other appropriate bonding material from the prior art .
The packaging material according to the invention may also include means aiming to facilitate the initiation of the tearing.
Preferably, said means for initiating the tearing are located at or near the edge (5) of the film material sheet used for the packaging.
According to an embodiment of the invention, said means for initiating the tearing is a cut made in the bound overlapping layers of the film material, or in all the overlapping layers (2), (2 ' ) , (21 ') of the film material.
According to the invention, said cut can be made according to a pattern selected from a group of cut patterns comprising a linear cut which is oblique relative to the axis of the folds, a two-edged triangular cut whose tip is pointing in the axis of the folds, a cut forming a tab pointing in the axis of the folds, a s-shaped cut whose general direction corresponds to the axis of the folds, and a zigzag cut whose general direction corresponds to the axis of the folds. However, any other appropriate cut pattern may be used.
In another embodiment of the invention, the film material sheet used for the film packaging is cut so as to leave a surface of extra film material (6) in the area of the parallel folds, said surface of extra film material (6) constituting a tab for initiating the tearing.
In a first sub-embodiment of the invention, as represented in Fig. 3, said film packaging (1) is characterized in that it comprises four parallel folds (4) , (4 ' ) , (4 ' ' ) , (4 ' ' ' ) in the film material, in that the second of said folds (4') corresponds to one edge of said surface of extra film material (6), and in that the third of said folds (4 ' ' ) corresponds to the other edge of said surface of extra film material (6) . Preferably, said surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval. However, any other suitable shape may be used. In a second sub-embodiment of the invention, as represented in Fig. 4, said film packaging (1) is characterized in that it comprises four parallel folds (4) , (4 ' ) , (4 ' ' ) , (4 ' ' ' ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the fourth of said folds (4 ' ' ' ) corresponds to the other edge of said surface of extra film material (6) .
In a third sub-embodiment of the invention, as represented in Fig. 6, said film packaging (1) is characterized in that it comprises two parallel folds (4), (41) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the second of said folds (4 ' ) extends through said surface of extra film material (6) until it reaches the outer edge (3) of said surface. The film packaging (1) may also be characterized in that said surface of extra film material (6) attaches to the film material sheet on a distance twice as long as the distance between the two parallel folds, and in that said surface of extra film material (6) has a symmetrical shape divided in two equal parts by the second of said parallel folds. The tab resulting from said folded surface of extra film material may have a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval. However, any other suitable shape may be used.
In a fourth sub-embodiment of the invention, as represented in Fig. 7, said film packaging (1) is characterized in that it comprises two parallel folds (4), (4 ' ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the second of said folds (4 ' ) corresponds to the other edge of said surface of extra film material (6) . Preferably, said surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval. However, any other suitable shape may be used.
In addition to the examples described herein, any other appropriate means for initiating the tearing may be used.

Claims

1. Film packaging (1) comprising opening means, characterized in that said opening means are constituted from at least two parallel folds
(4), (4 ' ) in the film material, and in that at least two of the overlapping layers (2), (2') of said film material formed by said folds are bound together.
2. Film packaging of claim 1, characterized in that said bound overlapping layers are bound together by heat.
3. Film packaging of claim 1, characterized in that said bound overlapping layers are bound together by a bonding material such as glue .
4. Film packaging of any one of claims 1 to 3, characterized in that it further comprises means for initiating the tearing.
5. Film packaging of claim 4, characterized in that said means for initiating the tearing are located at or near the edge (5) of the film material sheet used for the packaging.
6. Film packaging of any one of claims 4 and 5, characterized in that said means for initiating the tearing is a cut made in the bound overlapping layers of the film material .
7. Film packaging of any one of claims 4 and 5, characterized in that said means for initiating the tearing is a cut made in all the overlapping layers (2) , (21) , (21 ' ) of the film material.
8. Film packaging of any one of claims 6 or 7, characterized in that said cut is made according to a pattern selected from a group of cut patterns comprising a linear cut which is oblique relative to the axis of the folds, a two-edged triangular cut whose tip is pointing in the axis of the folds, a cut forming a tab pointing in the axis of the folds, a s-shaped cut whose general direction corresponds to the axis of the folds, and a zigzag cut whose general direction corresponds to the axis of the folds .
9. Film packaging of any one of claims 1 to 8, characterized in that the film material sheet used for the film packaging is cut so as to leave a surface of extra film material (6) in the area of the parallel folds, said surface of extra film material (6) constituting a tab for initiating the tearing.
10. Film packaging of claim 9, characterized in that it comprises four parallel folds (4) , (4 • ) , (4 ' ' ) , (4 ' ' ' ) in the film material, in that the second of said folds (4') corresponds to one edge of said surface of extra film material (6) , and in that the third of said folds (4 ' ' ) corresponds to the other edge of said surface of extra film material (6) .
11. Film packaging of claim 10, characterized in that said surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval.
12. Film packaging of claim 9, characterized in that it comprises four parallel folds (4) , (4 ' ) , (4 ' ■ ) , (4 ' ' ' ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the fourth of said folds (4 ' ■ ' ) corresponds to the other edge of said surface of extra film material (6) .
13. Film packaging of claim 9, characterized in that it comprises two parallel folds (4), (4 ' ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material (6) , and in that the second of said folds (4 ' ) extends through said surface of extra film material (6) until it reaches the outer edge (3) of said surface.
14. Film packaging of claim 13, characterized in that said surface of extra film material (6) attaches to the film material sheet on a distance twice as long as the distance between the two parallel folds
(4), (4'), and in that said surface of extra film material (6) has a symmetrical shape divided in two equal parts by the second of said parallel folds (4-) .
15. Film packaging of claim 14, characterized in that the tab resulting from said folded surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval.
16. Film packaging of claim 9, characterized in that it comprises two parallel folds (4), (4 ■ ) in the film material, in that the first of said folds (4) corresponds to one edge of said surface of extra film material, and in that the second of said folds (4 ' ) corresponds to the other edge of said surface of extra film material .
17. Film packaging of claim 16, characterized in that said surface of extra film material (6) has a shape selected from a group of shapes comprising square, rectangle, triangle, half-circle, and half-oval.
EP06821063A 2006-04-28 2006-11-28 Tear fold Withdrawn EP1901970A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IB2006001052 2006-04-28
PCT/IB2006/003599 WO2007125380A1 (en) 2006-04-28 2006-11-28 Tear fold

Publications (1)

Publication Number Publication Date
EP1901970A1 true EP1901970A1 (en) 2008-03-26

Family

ID=37898806

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06821063A Withdrawn EP1901970A1 (en) 2006-04-28 2006-11-28 Tear fold

Country Status (2)

Country Link
EP (1) EP1901970A1 (en)
WO (1) WO2007125380A1 (en)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2106748A (en) * 1933-05-06 1938-02-01 James C Karnes Container

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007125380A1 *

Also Published As

Publication number Publication date
WO2007125380A1 (en) 2007-11-08

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