WO2003105560A2 - Method for forming reclosable access portals in film packaging - Google Patents

Method for forming reclosable access portals in film packaging Download PDF

Info

Publication number
WO2003105560A2
WO2003105560A2 PCT/US2003/018877 US0318877W WO03105560A2 WO 2003105560 A2 WO2003105560 A2 WO 2003105560A2 US 0318877 W US0318877 W US 0318877W WO 03105560 A2 WO03105560 A2 WO 03105560A2
Authority
WO
Grant status
Application
Patent type
Prior art keywords
film
failure
element
film substrate
forming
Prior art date
Application number
PCT/US2003/018877
Other languages
French (fr)
Other versions
WO2003105560A3 (en )
Inventor
Ton A. J. L. Ebbers
Raaij Peter J. J. Van
Original Assignee
Polymer Group, 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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D75/00Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52Details
    • B65D75/58Opening or contents-removing devices added or incorporated during package manufacture
    • B65D75/5827Tear-lines provided in a wall portion
    • B65D75/5833Tear-lines provided in a wall portion for tearing out a portion of the wall
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D75/00Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/52Details
    • B65D75/58Opening or contents-removing devices added or incorporated during package manufacture
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B61/00Miscellaneous auxiliary devices operating on sheets, blanks, webs, binding material, containers, or packages, and not otherwise provided for
    • B65B61/18Miscellaneous auxiliary devices operating on sheets, blanks, webs, binding material, containers, or packages, and not otherwise provided for for making package-opening or unpacking elements

Abstract

The present invention is directed to means for forming frangible, reclosable access portals in various types of film packaging, and specifically, to means for forming reclosable access portals that exhibit improved uniformity in the presentation of the access port beneficial for forming an effective reclosable seal, while substantially reducing the potential of deleterious tearing of the film packaging. The access port is formed from a region of the film packaging, which has been subjected to mechanical weakening of the film substrate, wherein the weakened regions include frangible, failure elements and force directing elements. Failure elements of the weakened region induce the film substrate to preferentially fail (i.e. tear) continuously in the general direction and bounds of the element.

Description

Method For Forming Reclosable Access Portals In Film Packaging Technical Field

The present invention is directed to means for forming frangible, reclosable access portals in various types of film packaging, and specifically, to means for forming reclosable access portals that exhibit improved uniformity in the presentation of the access port beneficial for forming an effective reclosable seal, while substantially reducing the potential of deleterious tearing of the film package. Background of the Invention The use of film packaging is well known in the art as a means for sealing a product within a controlled environment and to prevent detrimental contamination. Products that have benefitted from such packaging include food products, tobacco, photographic film, medical aids, personal hygiene materials and home care agents. Of particular note, those products that are pre-moistened require an effective combination of durable film packaging with a strong, hermetic seal. The seal is not only a protective measure, but also, the unbroken seal indicates to the consumer that the package has not been improperly handled. Typical retail availability of products ensconced in durable film packaging includes having packages that contain more than one such product, or plural elements, such as sheets, of the same product. In situations where the product is adversely affected by continued exposure to the environment, it is necessary in such plural element packaging that a seal can be re-formed in the packaging after the initial element is removed, and that such seal be sufficiently effective to maintain the quality of the remaining elements until the last element is removed and the now empty packaging discarded. A retail film package must be able to resist mechanical failure and contamination during shipping and handling, and yet be accessible to the common user. Forming frangible access portals in film packaging that are receptive to reclosable actions are complex due to the necessary combination of a durable film package and a strong, hermetic seal.

Various prior art attempts have been made to form suitable closure means that do not compromise the ability of the film package to perform, including the use of molded thermoplastic closures and replaceable adhesive tabs. Molded thermoplastic closures allow for positive sealing action, but require additional forming steps. Further such thermoplastic closures require affixing to the film packaging, wherein such joining is in itself durable and leak-proof, and can form alternate paths of contamination including introduction of adhesives into the sealed environment within the film package. Replaceable adhesive tabs require the formation of an access way into the interior of the sealed film package. Typical practices for forming such access ways include perforating or otherwise pre-cutting and preferentially weakening regions in the film face. The frangible pre-cut region is then forced open by the consumer by tearing of the film face, a process which has been found to be a very difficult to perform not only completely, but also in such a way as to prevent over-extension or miss- direction of the tearing force that results in a subsequent failure of the reclosable mechanism. Such over-extension failures are particularly evident when oriented films are used as one or more layers in the film substrate, with tearing tending to propagate in the direction of film orientation.

An unmet need exists for a method of forming reclosable access portals in film packaging that maintains the sealed environment during shipping and handling, and yet can be readily utilized by the common consumer, and which substantially reduces the potential of deleterious tearing or over-extension of the access way. Summary of the Invention

The present invention is directed to means for forming frangible, reclosable access portals in various types of film packaging, and specifically, to means for forming reclosable access portals that exhibit improved uniformity in the presentation of the access port beneficial for forming an effective reclosable seal, while substantially reducing the potential of deleterious tearing of the film packaging. The access port is formed from a region of the film packaging, which has been subjected to mechanical weakening of the film substrate, wherein the weakened regions include frangible, failure elements and force directing elements. Failure elements of the weakened region induce the film substrate to preferentially fail (i.e. tear) continuously in the general direction and bounds of the element. Representative failure elements include complete depth perforations, partial depth perforations, scoring, and embossed or otherwise thinned film substrate areas. Force directing elements are discontinuities in the failure element that redirect the force vector in a direction of at least 10 degrees from the continuous path, generally defined by the failure elements. By combining failure elements and force directing elements in the region of the access port, the film can be induced to fail in a controlled and reproducible way, thus allowing for improved re-closure performance.

The film packaging may comprise any suitable homogenous or heterogeneous substrate, optionally of either laminate or composite construction, which is compatible with the intended product to be so contained. The film substrate may include barrier performance agents such as fatty acids, as well as topically applied aesthetic modifiers such as colorants and printed inks. It is presently envisioned that any profile of access portals can be practiced in accordance with the present invention, including, but not limited to; slits, ellipses, rectangles, and the combinations thereof, in which there is a combination of failure elements and force directors are combined in a discontinuous failure zone.

By application of the present invention, film packaging can be produced which forms uniform and reproducible access portals. It is within the purview of the invention that food materials, as well as hygienic, medical and home care products, can be packaged in suitable film substrates, wherein the clearly formed access portal allows for effective reclosable access. Detailed Description of the Figures

FIGURE 1 is a photograph of a typical retail product as packed in a film package with a conventional unopened access port; FIGURE 2 is a photograph of an oval knife as is conventionally practiced in the formation of prior art access portals in retail film packaging;

FIGURE 3 is a photograph of a retail film package wherein the access port has been formed utilizing the oval knife of FIGURE 2; FIGURE 4 is a photograph of a modified knife having failure elements and force directing elements in accordance with the present invention; and

FIGURE 5 is a photograph of a retail film package wherein the access port has been formed by way of the interaction of the failure elements and force directing elements.

Detailed Description

While the present invention is susceptible of embodiment in various forms, there will hereinafter be described, presently preferred embodiments, with the understanding that the present disclosure is to be considered as an exemplification of the invention, and is not intended to limit the invention to the specific embodiments disclosed herein.

The present invention is directed to a means for forming frangible access portals in weakened regions of film packaging, which entails the combination of failure elements and force directing elements. Failure elements of the weakened region induce the film substrate to preferentially fail (i.e. tear) continuously in the general direction and bounds of the element. Representative failure elements include complete depth perforations, partial depth perforations, suitable scoring, and embossed or otherwise thinned film substrate areas. Force directing elements are discontinuities in the failure element that redirect the force vector in a direction of at least 10 degrees from the continuous path. The failure elements enable the film to be torn by inducing a localized weakness in the film substrate. As force is applied to the failure elements, a tear is initiated in the film substrate, a tear which then propagates in the general direction and orientation of the failure element through continued application of force. At selected points along the failure element, wherein the incident angle of the failure element deviates by at least 10 degrees, force directing elements are introduced. Force directing elements terminate the propagation of the failure in the film substrate and allow for the force vector to be redirected from the continuous path. Such restraint of the tear prevents over-extension of the access portal beyond a predefined area in the face of the film packaging. Further, the force vector can be reoriented so as to initiate a new failure in the film substrate that is in a direction at least 10 degrees off of the path of the previous failure element. Such re-direction failure in the film substrate for forming an access opening therein can e particularly desirable in the case of oriented film substrates, where it can be desirable to form an opening which extends at least partially traversely to the direction of film orientation.

Suitable means for introducing failure elements and force directing elements into film substrates for packaging include the application of mechanical disruption of the film substrate, such as by application of metal knives, laser ablation, roll embossing, and hydraulic energy. The most preferred mechanism for inducing a frangible weakened region is through the use of metal knives that are forced against the film substrate. When metal knives are used, such as when presented as a cutting surface asperity in a section of tool steel, on a film substrate, the pressure and temperature of the process can be modulated simultaneously to obtain optimum cutting performance. Examples

Figure 1 depicts a representative product, which has been ensconced within film packaging. This particular product does not include any access portals as a way to obtain material from within the confines of the packaging. Figure 2 is a sample of a cutting knife as has been practiced in the prior art, represented by U.S. 5,379,897, incorporated herein by reference. The knife-edge is presented as an elliptical surface asperity projecting out of the face of the tool steel base, which in turn, defines a failure element that extends continuously about the weakened region. When the prior art cutting knife is used to form a weakened region in the surface of the representative product, and force is subsequently applied to the region so as to form an access way, tears propagate beyond the boundaries defined by the cutting knife, as shown in Figure 3.

Figure 4 provides a representative cutting knife embodying the teachings of the present invention. The elliptical failure element includes two force directing elements, 2 and 3. The force directing elements are at least 10 degrees off of the incident angle defined by the failure element; in the illustrated embodiment, the force direct elements are oriented at approximately 90 degrees to the direction of tearing defined by the otherwise elliptical failure element. When the cutting knife of Figure 4 is used to form a weakened region in the surface of the representative product, and force is applied, the tears propagate in the region specifically defined by the conjoined failure elements and force directing elements, and do not extend beyond the boundaries. Element 1 illustrated in FIGURE 4 facilitates complete formation of the access opening, and forms a connector joining the separated portion to the remainder of the substrate.

From the foregoing, numerous modifications and variations can be effected without departing from the true spirit and scope of the novel concept of the present invention. It is to be understood that no limitation with respect to the specific embodiments disclosed herein is intended or should be inferred. The disclosure is intended to cover, by the appended claims, all such modifications as fall within the scope of the claims.

Claims

What Is Claimed Is:
1. A method for forming access portals in film packaging, comprising the steps of: a. providing a film substrate, b. providing a means for imparting a weakened region in the film substrate, wherein said weakened region includes at least one failure element and at least one force directing element, and c. inducing said weakened region into said film substrate wherein said force directing element deviate from the failure element by an incident angle of at least 10 degrees as defined by the failure element.
2. A method for forming access portals as in Claim 1, wherein said film substrate is of heterogeneous formation.
3. A method for forming access portals as in Claim 1, wherein said means for imparting a weakened region are selected from the group consisting of mechanical knives, laser ablation, roll embossing, hydraulic energy, and the combinations thereof.
4. A method for forming access portals in film packaging as in Claim 1, wherein said failure elements are formed from full-depth perforations.
5. A film package for products comprising of a film substrate, wherein said film substrate comprises at least one access portal, said access portal formed in the surface of the film substrate so as to create a weakened region, said weakened region including at least one failure element and at least one force directing element, wherein said force directing element deviates from the failure element by an incident angle of at least 10 degrees as defined by the failure element.
PCT/US2003/018877 2002-06-13 2003-06-13 Method for forming reclosable access portals in film packaging WO2003105560A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US38857602 true 2002-06-13 2002-06-13
US60/388,576 2002-06-13

Publications (2)

Publication Number Publication Date
WO2003105560A2 true true WO2003105560A2 (en) 2003-12-24
WO2003105560A3 true WO2003105560A3 (en) 2004-05-13

Family

ID=29736497

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/018877 WO2003105560A3 (en) 2002-06-13 2003-06-13 Method for forming reclosable access portals in film packaging

Country Status (2)

Country Link
US (1) US20040035719A1 (en)
WO (1) WO2003105560A3 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9150342B2 (en) 2003-04-16 2015-10-06 Intercontinental Great Brands Llc Resealable tray container
US7963413B2 (en) 2006-05-23 2011-06-21 Kraft Foods Global Brands Llc Tamper evident resealable closure
US8308363B2 (en) 2006-05-23 2012-11-13 Kraft Foods Global Brands Llc Package integrity indicator for container closure
US7967510B2 (en) * 2006-08-08 2011-06-28 Kellogg Company Flexible container for pourable product
US8114451B2 (en) 2006-12-27 2012-02-14 Kraft Foods Global Brands Llc Resealable closure with package integrity feature
US8408792B2 (en) 2007-03-30 2013-04-02 Kraft Foods Global Brands Llc Package integrity indicating closure
GB0819200D0 (en) 2008-10-20 2008-11-26 Cadbury Holdings Ltd Packaging
US20110127319A1 (en) * 2009-12-01 2011-06-02 Kraft Foods Global Brands Llc Resealable flexible film packaging products and methods of manufacture
ES2390202T3 (en) 2010-01-26 2012-11-07 Generale Biscuit Resealable packaging for food products and manufacturing process
US8814430B2 (en) * 2010-02-23 2014-08-26 Kraft Foods R&D, Inc. Food package having opening feature
ES2390568T3 (en) 2010-03-23 2012-11-14 Generale Biscuit Container is reclosable for food products and method of manufacture
WO2011146658A1 (en) 2010-05-18 2011-11-24 Kraft Foods Global Brands Llc Reclosable flexible packaging and methods for manufacturing same
US9656783B2 (en) 2010-05-18 2017-05-23 Intercontinental Great Brands Llc Reclosable flexible packaging and methods for manufacturing same
CN103517855B (en) 2011-03-17 2016-03-16 洲际大品牌有限责任公司 Reclosable flexible film packaging products and method of manufacture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833862A (en) * 1982-11-15 1989-05-30 W. R. Grace & Co. - Conn. Method and apparatus for vacuum packaging and package obtained thereby
US5201164A (en) * 1991-05-17 1993-04-13 Kimberly-Clark Corporation Method for improving the dispensing of stacked wet wipes
US5379897A (en) * 1992-07-20 1995-01-10 The Procter & Gamble Company Disposable, compactable, shape-restorable packages for storing and dispensing dry or premoistened sheets

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983000677A1 (en) * 1981-08-21 1983-03-03 Jud, Wilfried Package with gas-tight envelope
DE69017770D1 (en) * 1989-07-01 1995-04-20 Nestle Sa Packaging for food products.
JPH074377U (en) * 1993-06-21 1995-01-24 富士写真フイルム株式会社 Package
JPH1081361A (en) * 1996-09-07 1998-03-31 Komatsu Electron Metals Co Ltd Unsealing structure of film package

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4833862A (en) * 1982-11-15 1989-05-30 W. R. Grace & Co. - Conn. Method and apparatus for vacuum packaging and package obtained thereby
US5076436A (en) * 1982-11-15 1991-12-31 W. R. Grace & Co.-Conn. Vacuum packaging
US5201164A (en) * 1991-05-17 1993-04-13 Kimberly-Clark Corporation Method for improving the dispensing of stacked wet wipes
US5379897A (en) * 1992-07-20 1995-01-10 The Procter & Gamble Company Disposable, compactable, shape-restorable packages for storing and dispensing dry or premoistened sheets

Also Published As

Publication number Publication date Type
US20040035719A1 (en) 2004-02-26 application
WO2003105560A3 (en) 2004-05-13 application

Similar Documents

Publication Publication Date Title
US3335939A (en) Resealable package closure
US4574951A (en) Reclosable package
US5908246A (en) Unsealing structure with cut out for shrink film sealed packages
US2329360A (en) Package openable by tearing
US6036016A (en) Blister package with easy tear blister
US20100278454A1 (en) Tamper-evident laminate structure
US20020068668A1 (en) Method for laser machining easy open, tear flexible packaging
US5443154A (en) Easy separating package and method
US6974256B2 (en) Fastener closure arrangement for flexible packages
US4673601A (en) Cold- or heat-sealable composite film for reclosable packages
US7021827B2 (en) Easy-opening feature for flexible packages and process and apparatus for forming same
EP1288139A1 (en) Package for packing food products and method of packing food products
US5470016A (en) Reducible volume containers
US20090190866A1 (en) Packaging with lines of weakness
US20040060974A1 (en) Container with tamper-evidence, reclosure features
US6625955B2 (en) Methods for forming product package with recloseable locking mechanism
US20050025394A1 (en) Flexible packages having slide closures and apparatus for their manufacture
US7032757B2 (en) Tamper evident food packaging
US20130114918A1 (en) Easy Open Flexible Film Packaging Products and Methods of Manufacture
US5135790A (en) Tear tape opening system
US20030019780A1 (en) Easy opening, re-closeable bag
US20130121624A1 (en) Reclosable Flexible Packaging And Methods For Manufacturing Same
US20080273821A1 (en) Method and Apparatus for Laser Scored Packaging
US20110204056A1 (en) Food Package Having Opening Feature
US3556388A (en) Packing box with collapsible take-out opening

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

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 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: A2

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 in:

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP