EP0957044B1 - Leicht zu öffnende Anordnung an einem gasdichten, geschrumpften Beutel - Google Patents
Leicht zu öffnende Anordnung an einem gasdichten, geschrumpften Beutel Download PDFInfo
- Publication number
- EP0957044B1 EP0957044B1 EP98108494A EP98108494A EP0957044B1 EP 0957044 B1 EP0957044 B1 EP 0957044B1 EP 98108494 A EP98108494 A EP 98108494A EP 98108494 A EP98108494 A EP 98108494A EP 0957044 B1 EP0957044 B1 EP 0957044B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bag
- pouch
- seal
- closed
- area
- 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.)
- Expired - Lifetime
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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
Definitions
- the invention relates to a pouch or bag of a heat shrinkable gas-barrier, thermoplastic film for packaging one or a plurality of items and to a method of packaging an article in this pouch or bag.
- the invention relates to an easy openable bag or pouch for vacuum shrink packaging characterized by the fact that it has two hems that can be easily gripped, facilitating the opening.
- One of the packaging methods that are in common practice today is vacuum shrink packaging, according to which an article of interest is wrapped with a heat-shrinkable thermoplastic film, that is in the form of a bag, a sheet folded in two or the like and the package is vacuumised, heat sealed and cut off along the edge portions. The obtained package is heat shrunk to provide a tight appearance.
- the heat shrink packaging is gaining increased popularity because it adds to the aesthetic appeal of the packaged articles, thereby enhancing their commercial value and it permits easy packaging of articles even if they have complex shapes.
- packages overwrapped in heat-shrinking film have the disadvantage that overpwraps stick so closely to the underlying surfaces and are in such tension that they are difficult to tear when the package must be torn open.
- Said methods include: i) forming a line of perforations in a specified position on a heat shrinkable film so that one can open the package by tearing it along said line; ii) making a U-shaped hole in a specified site on the film and attaching a paper seal over the hole to form a seal label that serves as an aid in opening the package; and iii) additionally attaching a so-called "opening tape".
- a heat shrinkable film wrap for a food product has an edge zone isolated from the remainder by a seal between opposed film layers, and a cut extending inwardly in the zone from one edge to form a tongue when heat-shrunk to facilitate opening.
- the film is wrapped around the product, heat sealed peripherally and then heat-shrunk.
- the zone is preferably separate from and adjacent to the package closure heat seal, and may be heat-sealed peripherally or over its entire area.
- the film may be a bag for packaging the product under vacuum, or allow packaging under a modified atmosphere.
- This system has the disadvantage that, when shrunk, the protruding tongue is not visible and is difficult to grip, thus leading to an unpleasant appearance and sometimes even to an accidental break of the package. There is therefore the need for a sure easy opening system with a better packaging appearance.
- NL-A-6 900 418 discloses a pouch having the features included in the preamble of claim 1.
- a bag or a pouch comprising a seal along a line, in-between the bottom and the mouth connecting the two side edges and defining with the closed bottom of the bag or pouch and part of the side edges a closed, airtight area, said closed bottom also comprising another seal extending from the closed bottom inward the closed, airtight area; the two hems, that are thus created, by means of gas present in the airtight area upon heat treatment, can be pulled one backward and the other forward to open the package.
- the gas present in the airtight area may also reduce the shrinkage of the thermoplastic film in that area.
- a first object of the present invention is therefore a pouch or bag (1) of a heat shrinkable gas-barrier, thermoplastic film for packaging one or a plurality of items, said pouch or bag comprising a closed bottom (2), two closed side edges (3) and (4) and an open mouth (5) for the introduction of the items to be packaged, said pouch or bag being characterized in that it comprises a seal (6) along a line, in-between the bottom (2) and the mouth (5), connecting the two side edges (3) and (4), said seal (6) defining with the closed bottom (2) and part of the side edges (3') and (4') a closed, airtight area (7) and in that it further comprises another seal (8) extending from the closed bottom (2) toward the closed, airtight area (7) and a precut (9) made in the area delimited by the bottom (2) and the seal (8).
- a particular embodiment of the present invention is the above mentioned pouch or bag wherein the airtight area may also contain an amount of gas, such that it balloons upon heat treatment creating two pillow shaped hems having a better packaging appearance.
- a second object of the present invention is an easy to open, heat-shrunk, vacuum package characterized in that the product is introduced into the above mentioned pouch or bag that is then vacuumised, the mouth (5) is then sealed and the package is submitted to a heat treatment.
- homopolymer is used with reference to a polymer resulting from the polymerization of a single monomer, i.e., a polymer consisting essentially of a single type of repeating unit.
- copolymer refers to polymers formed by the polymerization reaction of at least two different monomers.
- polymer refers to both homopolymers and co-polymers as defined above.
- barrier layer is used with reference to the ability of a film layer to substantially reduce the film permeability to gases such as oxygen and carbon dioxide.
- barrier layers comprise a barrier resin such as PVDC or EVOH.
- heat-shrinkable refers to films showing a % free shrink of at least 15 %, in at least one direction, when heated, unrestrained, at a temperature of 120°C for 4 seconds in accordance to ASTM D 2732, as set forth in the 1990 Annual Book of ASTM Standards, Vol. 08.02, pp. 368-371.
- a first object of the present invention is a pouch or bag (1) of a heat shrinkable gas-barrier, thermoplastic film for packaging one or a plurality of items, said pouch or bag comprising a closed bottom (2), two closed side edges (3) and (4) and an open mouth (5) for the introduction of the items to be packaged, said pouch or bag being characterized in that it comprises a seal (6) along a line, in-between the bottom (2) and the mouth (5), connecting the two side edges (3) and (4), said seal (6) defining with the closed bottom (2) and part of the side edges (3') and (4') a closed, airtight area (7) and in that it further comprises another seal (8) extending from the closed bottom (2) toward the closed, airtight area (7) and a precut (9) made in the area delimited by the bottom (2) and the seal (8).
- the film used is a mono- or bi-axially oriented, heat shrinkable film.
- Mono- or bi-axially oriented heat-shrinkable films are typically made by extruding or coextruding polymers from a melt into a thick film, followed by a quick quenching to prevent or delay crystallization and by orientation of the thick film by stretching it, either monoaxially or biaxially, under temperature conditions where molecular orientation of the film occurs and the film does not tear. Upon subsequent re-heating at a temperature close to the orientation temperature it will tend to shrink in seeking to recover its original dimensional state.
- Bi-axially oriented heat-shrinkable films can be obtained by extruding or co-extruding the polymer(s) through a round die giving a tubular thick film called "tape", that is immediately and quickly quenched by means of a water bath or cascade typically to about room temperature. Said tape is then heated at the orientation temperature and stretched biaxially, while at this temperature, e.g. by the so-called "trapped bubble” technique that uses internal gas pressure to expand the diameter of the tape to form a large "bubble” and advancing the expanded tube at a faster rate than the extrusion rate so as to obtain transverse and machine directions of orientation respectively. Usually the stretch is at least about 3X in each direction.
- the film is then cooled and rolled up in the cooled state so as to retain the property of heat-shrinkability.
- the orientation temperature range generally depends on the type of polymers employed.
- the orientation temperature used for the manufacture of heat-shrinkable films is in any case lower than the melting temperature of at least one polymer present in the film.
- mono- or bi-axially oriented heat-shrinkable films can be obtained by extruding the polymers through a flat die in the form of a sheet, and after a quenching step, heating the sheet to the orientation temperature and stretching it. Longitudinal orientation is generally obtained by running the sheet over at least two series of pull rolls wherein the second set runs at a higher speed than the first one.
- Cross-wise or transversal orientation is generally done in a tenter frame where the edges of the sheet are grasped by clips carried by two continuous chains running on two tracks that move wider apart as they go along.
- the stretching may be simultaneous in both directions.
- the stretched film is then cooled and rolled up as usual.
- the stretch is usually at least about 3X in each direction, but higher ratios are also common.
- the films used will typically be made of a multilayer structure comprising a gas barrier layer, such as for instance a layer comprising PVDC, EVOH, a poly- or copolyamide, etc. as known in this field.
- a gas barrier layer such as for instance a layer comprising PVDC, EVOH, a poly- or copolyamide, etc. as known in this field.
- Other layers may clearly be present in order to provide the structure with the thickness and the mechanical properties required.
- a package can have various shape; can have rounded, straight or irregular edges; one or more of these are typically heat sealed.
- Bags normally include one or two factory seals, and one or two folded edges: one edge, the open mouth of the bag adapted to receive an article, is heat sealed after loading the article into the bag.
- TS bag transverse seal bag
- the bags are formed by laying flat a tubing of a thermoplastic film. Thereafter the film enters in an unwinding station followed by an hydraulic system for the definition of the size of the bag. This is followed by an impulse sealing forming the side edges (3) and (4) of the bag and a knife precutting station, that cuts the tube and forms the mouth (5) of the bag.
- the precut serrated chain goes through a bag separation station and the formed bags are placed and aligned on a conveyor belt forming a bag chain that can be eventually taped and boxed. Thereafter the article is placed in the bags and these are vacuumised, sealed and heat shrunk to complete a tight package.
- the closed side edges (3) and (4) are formed by laying flat a tubing of a thermoplastic film and the closed bottom (2) is formed by heat-sealing.
- the flattened tape enters in an unwinding station followed by an impulse sealing and a knife cutting station. Formed bags are then placed and aligned on a conveyor belt by a mechanical and pneumatic device.
- a taping station allows to have a collated bag chain.
- Bags or pouches according to the present invention are also made by using the horizontal form fill machines.
- Such packings are made from a heat shrinkable gas-barrier, thermoplastic film for packaging one or a plurality of items, shaped into a tube by a longitudinal sealing while at the same time the article to be packed is inserted into this tube. Thereafter the tube is closed at its two ends by two hermetic transverse heat sealings.
- This type of packs may also be made under modified atmosphere.
- Bags according to the present invention are made with these or other methods and have a further seal (6) made along a line, in-between the bottom (2) and the mouth (5), connecting the two side edges (3) and (4), said seal (6) defining with the closed bottom (2) and part of the side edges (3') and (4') a closed, airtight area (7).
- a seal (8) extending from the closed bottom (2) inward the closed, airtight area (7) is made before or in conjunction or subsequently to the previously described seal.
- the seal (6) which is indicated in the attached figures as a straight line could also be rounded or have any particular shape connecting the side edges of the packaged product.
- the seal (8) may have a V or Y or rounded shape, preferably it has a V shape and is preferably made at an equal distance from both the side edges as shown in fig. 1, in order to create two distinct hems upon heat treatment. Pulling one hem forward and the other backward the package is easily opened.
- the seal (6) may be made on preformed bags by means of a device or kit able to form at the same time the seal (6) and the easy opening seal (8).
- the seal (6) is preferably an impulse seal.
- a precut (9) is also made in the area delimited by the bottom (2) and the seal (8).
- This precut (9) may also be serrated.
- the package starts to tear from this precut (9).
- this precut (9) is made starting from the bottom (2) of the bag and extending toward the seal (8) itself.
- the precut (9) may be made in form of a hole (11) made in the area delimited by the bottom (2) and the seal (8).
- the hole (11) may be useful for hanging the package, and at the same time may be shaped in order to initiate from it the opening of the package instead of using the precut (9).
- the hole (11) may be made in addition and next to the precut (9).
- the seal (6), the seal (8) and the precut (9) may be made also during the bag making.
- Shrink bags according to the present invention may be also printed or coloured.
- shrink bags according to the present invention may also have printed or drawn arrows or drawings to indicate how to pull the hems to open the package.
- the airtight area contains an amount of gas such that it balloons upon heat treatment creating two pillow shaped hems having an easier openability of the package and a better packaging appearance.
- the gas present in the airtight area may also reduce the shrinkage of the thermoplastic film in that area.
- the two pillow shape hems are indicated as (10).
- the airtight area (7) contains an amount of gas preferably comprised between from about 0.1 cc / 0.5 cm 2 of airtight area to about 0.1 cm 3 /0.5 cm 2 .
- the packaging appearance will be inferior as the two hems will not have a pillow shape.
- the package may rupture particularly during the shrinkage, but also during the stacking of bags.
- the easy opening according to said particular embodiment of the present invention is made on TS and ES bags by introducing some gas, typically air, in the bag.
- the gas may be introduced in the bag during the bag making, after the seal (8) has been made. Thereafter the seal (6) is made.
- the seal (6) may be made before and then the precut (9); the gas, typically air may be introduced from the precut (9), and thereafter the seal (8) is made.
- the gas may be introduced through the precut after this is made. Thereafter the seal (6) and (8) are made simultaneously or sequentially.
- the gas may be introduced by means of a small nozzle, or by means of a fan, or by means of suction pads applied to the sides of the bag, wherein the vacuum created by the suction pads causes the separation of the bags sides and the introduction of gas between these.
- the introduction of gas may be also helped by a roller.
- the easy opening according to said particular embodiment of the present invention is made on bags formed by the form fill seal machine by making the seal (6) and (8) and the precut (9) at the same time or sequentially with the seal closing the packages, while loading the product.
- this type of packages formed by a thermoplastic film shaped into a tube, the airtight area delimited by the seal (6) and (8) and by the side edges (3') and (4') will already contain an amount of gas sufficient to create two pillow shaped hems upon heat treatment and there will be therefore no need of inflating additional gas.
- a second object of the present invention is an easy to open, heat-shrunk, vacuum package characterized in that a product is introduced into a pouch or bag according to the present invention, said pouch or bag is then vacuumised, the mouth (5) is sealed and the package is submitted to heat treatment.
- This invention can be used in conjunction with all currently available packaging equipment.
- packs C was judged to be better than that of parts B by 70 % of the panelists and comparable by 18 % of the panelists.
Claims (9)
- Beutel oder Tasche (1) aus thermoplastischer Folie zum Verpacken von einem oder mehreren Gegenständen, wobei der Beutel oder die Tasche umfasst: einen geschlossenen Boden (2), zwei geschlossene Seitenränder (3) und (4), einen offenen Mund (5), eine Siegelung (6) entlang einer Linie zwischen dem Boden (2) und dem Mund (5), die die beiden Seitenränder (3) und (4) verbindet, wobei die Siegelung (6) mit dem geschlossenen Boden (2) und einem Teil der Seitenränder (3') und (4') einen geschlossenen luftdichten Bereich (7) definiert, eine weitere Siegelung (8), die sich von dem geschlossenen Boden (2) in Richtung des geschlossenen luftdichten Bereichs (7) erstreckt, und einen Einschnitt (9), der in dem Bereich vorgenommen wurde, der durch den Boden (2) und die Siegelung (8) begrenzt wird, dadurch gekennzeichnet ist, dass die thermoplastische Folie eine wärmeschrumpfbare und Gasbarrierefolie ist und dass Gas in dem luftdichten Bereich (7) vorhanden ist, so dass er sich bei Wärmebehandlung aufbläht, wodurch zwei kissenförmige Ränder erzeugt werden.
- Beutel oder Tasche nach Anspruch 1 mit einem zusätzlichen Loch (11) in dem Bereich, der durch den Boden (2) und die Siegelung (8) begrenzt ist.
- Beutel oder Tasche nach Anspruch 1 mit einem Einschnitt (9) in Form eines Lochs (11) in dem Bereich, der durch den Boden (2) und die Siegelung (8) begrenzt ist.
- Beutel oder Tasche nach Anspruch 1, der bzw. die gebildet ist, indem ein Schlauch aus thermoplastischer Folie flachgelegt worden ist, die geschlossenen Seitenränder (3) und (4) durch Impulssiegelung gebildet worden sind und der offene Mund (5) durch Aufschneiden des Schlauchmaterials mit einem Messer gebildet worden ist.
- Beutel oder Tasche nach Anspruch 1, der bzw. die gebildet ist, indem ein Schlauch aus thermoplastischer Folie flachgelegt worden ist, wodurch die geschlossenen Seitenränder (3) und (4) gebildet worden sind, und der geschlossene Boden (2) durch Heißsiegelung gebildet worden ist.
- Beutel oder Tasche nach Anspruch 1, bei dem bzw. der die Siegelung (6) parallel zu dem geschlossenen Boden (2) verläuft.
- Beutel oder Tasche nach Anspruch 1, bei dem bzw. der die Siegelung (8) eine V-Form hat.
- Beutel oder Tasche nach Anspruch 1, bei dem bzw. der der luftdichte Bereich (7) eine Gasmenge von etwa 0,1 cm3/1 cm2 luftdichte Fläche bis 0,5 cm3/1 cm2 luftdichte Fläche enthält.
- Verfahren zur Herstellung einer aufreißbaren, wärmegeschrumpften Packung, bei dem- ein Produkt in einen Beutel oder eine Tasche (1) gemäß einem der vorhergehenden Ansprüche eingeschlossen wird,- der Beutel oder die Tasche vakuumisiert wird,- der Mund (5) des Beutels oder der Tasche versiegelt wird, und- der geschlossene Beutel oder die geschlossene Tasche einer Wärmebehandlung unterzogen wird, um die Packung zu schrumpfen und den luftdichten Bereich (7) aufzublähen.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98108494A EP0957044B1 (de) | 1998-05-11 | 1998-05-11 | Leicht zu öffnende Anordnung an einem gasdichten, geschrumpften Beutel |
AT98108494T ATE353833T1 (de) | 1998-05-11 | 1998-05-11 | Leicht zu öffnende anordnung an einem gasdichten, geschrumpften beutel |
DE69837082T DE69837082T2 (de) | 1998-05-11 | 1998-05-11 | Leicht zu öffnende Anordnung an einem gasdichten, geschrumpften Beutel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98108494A EP0957044B1 (de) | 1998-05-11 | 1998-05-11 | Leicht zu öffnende Anordnung an einem gasdichten, geschrumpften Beutel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0957044A1 EP0957044A1 (de) | 1999-11-17 |
EP0957044B1 true EP0957044B1 (de) | 2007-02-14 |
Family
ID=8231905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98108494A Expired - Lifetime EP0957044B1 (de) | 1998-05-11 | 1998-05-11 | Leicht zu öffnende Anordnung an einem gasdichten, geschrumpften Beutel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0957044B1 (de) |
AT (1) | ATE353833T1 (de) |
DE (1) | DE69837082T2 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8522978B2 (en) | 2006-12-01 | 2013-09-03 | Cryovac, Inc. | Stress concentrator for opening a flexible container |
US10189621B2 (en) * | 2007-05-21 | 2019-01-29 | Cryovac, Inc. | Bag made from high-strength heat-shrinkable film exhibiting directional tear, and process utilizing same |
US10202229B2 (en) | 2007-05-21 | 2019-02-12 | Cryovac, Inc. | Easy opening packaging article made from heat-shrinkable film exhibiting directional tear |
US9561889B2 (en) * | 2007-05-21 | 2017-02-07 | Cryovac, Inc. | Easy opening packaging article made from heat-shrinkable film exhibiting directional tear |
ES2647779T3 (es) * | 2008-11-20 | 2017-12-26 | Cryovac, Inc. | Artículo de envase de apertura fácil hecho de película termorretráctil que exhibe rasgado direccional |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3578239A (en) * | 1967-04-14 | 1971-05-11 | Vac Pac Mfg Co | Bag structure |
NL166656C (nl) * | 1968-05-08 | 1981-09-15 | Basic Packaging Systems Inc | Inrichting voor het vullen van met elkaar verbonden zakelementen. |
NL6900418A (de) * | 1969-01-10 | 1970-07-14 | ||
EP0078761A3 (de) * | 1981-10-29 | 1984-01-18 | Crown Zellerbach Corporation | Behälter mit unter Druck aufreissbarer naht zur Abgabe des Inhalts |
GB8828349D0 (en) * | 1988-12-05 | 1989-01-05 | Du Pont Canada | Film laminate with easy to td tear |
US5334180A (en) * | 1993-04-01 | 1994-08-02 | Abbott Laboratories | Sterile formed, filled and sealed flexible container |
FR2734792B1 (fr) * | 1995-05-29 | 1997-07-18 | Grace Sa | Emballage d'article, tel que produit alimentaire, pouvant etre facilement ouvert et procede de realisation d'un tel emballage. |
-
1998
- 1998-05-11 DE DE69837082T patent/DE69837082T2/de not_active Expired - Lifetime
- 1998-05-11 EP EP98108494A patent/EP0957044B1/de not_active Expired - Lifetime
- 1998-05-11 AT AT98108494T patent/ATE353833T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE69837082T2 (de) | 2007-11-22 |
EP0957044A1 (de) | 1999-11-17 |
DE69837082D1 (de) | 2007-03-29 |
ATE353833T1 (de) | 2007-03-15 |
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