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11-03-2010

Heat sealed sack of flexible film comprising a relief valve

A heat sealed sack (1) of flexible film of weldable plastic for airtight packaging of foodstuff to be warmed before consuming it, has a valve (2) for releasing pressurized vapors and/or gases in form of an insert of localized detachment of seal surfaces at a point along a weld seam joining juxtaposed edges of said flexible film of weldable plastic. The insert of localized detachment is in the form of a sticker pre-applied at a precisely determined location on the inner surface of said flexible film, in an area of the film destined to be welded for sealing the sack. The sticker comprises a flexible film of weldable plastic having a surface treated to render it peelable and a layer of a pressure activated adhesive over said peelable surface of application of the sticker onto the inner surface of said flexible film of the sack, or a multilayer laminate comprising a flexible film of a peelable film, a layer of pressure activated adhesive on the surface of application onto the inner surface of said flexible film of the sack and a solvent free layer of a weldable laquer or a second flexible film of weldable plastic first film.

Document: EP2246271A1
Click here for the full patent text at DEPATISnet [PDF]
Published patent application
Disclosure date: 10-02-2007
Publication date: 11-03-2010
Applicant: MASTERPACK S P A, IT
Inventor: BINDA VALERIO, IT


© European Patent Office. This information was obtained from the espacenet of the European Patent Office. There is no guarantee of its correctness or curency. For additional information, please use the research at espacenet. It is possible to determine the current legal and procedural status of patents and utility patents/models at http://worldwide.espacenet.com/ kfree of charge.

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