EP2072414A1 - Sac à soufflet en matériau synthétique pour conserver les aliments - Google Patents

Sac à soufflet en matériau synthétique pour conserver les aliments Download PDF

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Publication number
EP2072414A1
EP2072414A1 EP08019726A EP08019726A EP2072414A1 EP 2072414 A1 EP2072414 A1 EP 2072414A1 EP 08019726 A EP08019726 A EP 08019726A EP 08019726 A EP08019726 A EP 08019726A EP 2072414 A1 EP2072414 A1 EP 2072414A1
Authority
EP
European Patent Office
Prior art keywords
bag
seals
parallel sealing
sealing lines
bracing
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Withdrawn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
EP08019726A
Other languages
German (de)
English (en)
Inventor
Alberto Malaspina
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.)
Nuova Poliver Srl
Original Assignee
Nuova Poliver Srl
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 Nuova Poliver Srl filed Critical Nuova Poliver Srl
Publication of EP2072414A1 publication Critical patent/EP2072414A1/fr
Withdrawn legal-status Critical Current

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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
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides

Definitions

  • Bags are available on the market for freezing food such as vegetable and fruit produce in the home.
  • the bags are manufactured from an extruded tube of polyethylene film that is flattened, cut into pieces of a desired length, and simultaneously heat-sealed transversely near one end.
  • the bag is usually provided with lateral gussets that are obtained by forming two indented folds in the film tube during flattening.
  • the sealing conditions necessarily are a compromise between the optimum values that would be appropriate for two layers and for four layers, respectively. What usually happens is that the seal in the central area is weaker, and therefore liable to failures in case of excessive filling, squeezing, or inflating.
  • the object of the invention is to improve the effectiveness of the bottom seal with respect to gusseted bags of the prior art, particularly bags as disclosed in IT-U-236009 .
  • Another object is to provide the above high-strength bag at a manufacturing cost that is substantially identical as for a conventional double-seal bag as disclosed in IT-U-236009 .
  • a tube of polyethylene film 10 is flattened so that it includes lateral indented folds 12,14, by means known to persons skilled in the art. At one of its ends, the tube is sealed with a transverse heat seal 15 (described below in more detail) so that a gusseted bag is obtained. Accordingly, seal 15 extends both along a central area 16 comprising two overlapping film layers, and along two lateral areas 18, 20, comprising four overlapping film layers.
  • seal 15 is seen to comprise two parallel sealing lines 22, 24, with bracing seals 26 extending at intervals across lines 22, 24.
  • the seal so patterned can be defined as a "truss seal", similar to so-called cross-linked trusses, where an enhanced bending strength is obtained with respect to a plain beam of similar weight, due to the interwoven action of the struts and tierods acting between the two main beams.
  • Fig. 3 shows a seal fragment, and also shows the shape that a hot bar should have in order to produce the seal so patterned.
  • Parallel lines 22, 24 correspond to two respective metal ribbons, in which respective heating electric currents flow.
  • the bracing cross-seals 26 are made by ties (not shown) integral with the ribbons, and heated by them by conduction.
  • the two parallel sealing lines 22, 24 have each a width of about 1 mm, are about 4 mm apart from each other, and transverse bracing seals 26 also have a width of about 1 mm and are placed at uniform intervals of about 6 mm.
  • Fig. 4 shows a modification of the sealing, which still comprises two parallel sealing lines, between which extend bracing seals inclined at angles of 45-60° in alternately opposite directions.
  • Fig. 5 shows a further modification of the seal, similar to the seal of Fig. 3 , though it further comprises a third sealing line 28 extending parallelly in mid position between lines 22, 24.
  • the third sealing line corresponds to an additional current conductor in mid-position in the hot bar, causing the cross elements to be heated more effectively, and therefore giving rise to a more secure seal.
  • Tests were made by inflating bags having double seals according to the above mentioned IT-U-236009 , on the one hand, and bags having truss seals according to the present invention, on the other hand.
  • the latter have shown a definitely better strength, in that they tolerated a higher internal pressure.
  • This can also be seen visually in that the two sealing lines in the bag of the invention remain apart from each other when the bag is subjected to an internal pressure which is sufficient to cause the sealing lines to abut against each other in the case of bags sealed with a double line but without any bracing seals.
  • the distances between the transverse seals could be different from each other, e.g. they might widen from the central axis of the bag toward its sides.
  • the disclosure only mentions polyethylene film, the invention encompasses use of any film made from a sealable synthetic material.
  • the examples shown always refer to heat sealing, it should be understood that the same arrangements can be used when the bags are manufactured by electronic microwave sealing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Making Paper Articles (AREA)
EP08019726A 2007-12-19 2008-11-12 Sac à soufflet en matériau synthétique pour conserver les aliments Withdrawn EP2072414A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO20070160 ITTO20070160U1 (it) 2007-12-19 2007-12-19 Sacchetto soffiettato di materiale sintetico per alimenti

Publications (1)

Publication Number Publication Date
EP2072414A1 true EP2072414A1 (fr) 2009-06-24

Family

ID=40316163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08019726A Withdrawn EP2072414A1 (fr) 2007-12-19 2008-11-12 Sac à soufflet en matériau synthétique pour conserver les aliments

Country Status (2)

Country Link
EP (1) EP2072414A1 (fr)
IT (1) ITTO20070160U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20090193A1 (it) * 2009-09-03 2011-03-04 I P S S R L Internat Project Services "sacco di sicurezza per trasporto valori"

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2758309A3 (fr) * 1997-01-16 1998-07-17 Nuova Poliver Di Oddone Colomb Sac a usage menager
JP2004033103A (ja) * 2002-07-03 2004-02-05 Shinano Pori:Kk 菌床用培養袋
JP2004262519A (ja) * 2003-03-03 2004-09-24 Shin Etsu Polymer Co Ltd ティアテープ付フィルム包装袋及びその形成方法
WO2006048178A1 (fr) * 2004-11-03 2006-05-11 Ilapak International S.A. Enveloppe inviolable pour cartes
DE112005002793T5 (de) * 2004-11-10 2007-10-11 Showa Denko Packaging Co., Isehara Laminat zum Verpacken und Verpackungsbeutel und ein Beutel zum Verpacken eines elektronischen Produktes, die jeweils das Gleiche enthalten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2758309A3 (fr) * 1997-01-16 1998-07-17 Nuova Poliver Di Oddone Colomb Sac a usage menager
JP2004033103A (ja) * 2002-07-03 2004-02-05 Shinano Pori:Kk 菌床用培養袋
JP2004262519A (ja) * 2003-03-03 2004-09-24 Shin Etsu Polymer Co Ltd ティアテープ付フィルム包装袋及びその形成方法
WO2006048178A1 (fr) * 2004-11-03 2006-05-11 Ilapak International S.A. Enveloppe inviolable pour cartes
DE112005002793T5 (de) * 2004-11-10 2007-10-11 Showa Denko Packaging Co., Isehara Laminat zum Verpacken und Verpackungsbeutel und ein Beutel zum Verpacken eines elektronischen Produktes, die jeweils das Gleiche enthalten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITFI20090193A1 (it) * 2009-09-03 2011-03-04 I P S S R L Internat Project Services "sacco di sicurezza per trasporto valori"

Also Published As

Publication number Publication date
ITTO20070160U1 (it) 2009-06-20

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