B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 27/34 (2006.01) B32B 1/02 (2006.01) B65D 30/08 (2006.01) B65D 65/40 (2006.01) B65D 81/34 (2006.01)
Patent
CA 2438265
A dual ovenable film having a first layer comprising one or more polyamides and a second layer comprising one or more polyamides. The first layer forms the first outer surface of the film. The second layer has a melting point of at least about 210°C. The film is capable of forming a water-containing package by providing two 4 inch by 6 inch sheets of the film each having four perimeter sides, placing the sheets in superimposed, coextensive arrangement having the first layers of the films in contact with each other, and heat sealing three perimeter sides of the sheets together using a 1/8-inch wide sealing bar at a temperature o~ 290°F, a dwell time of 0.5 seconds, and a sealing pressure of 40 psig to form an open pouch having heat seals along three of the four perimeter sides, The open pouch can be filled with 100 milliliters of distilled water at a temperature of 73°F and the fourth perimeter side of the sheet can be heat sealed together under the same conditions as used to seal the three perimeter sides to form a closed package having a heat seal along the fourth perimeter side and containing the water. The seal strength of the resulting heat seals is at least 1 pound/inch after the closed, water-containing package has been exposed to three hours in a conventional oven at 400°F (air temperature). The film may be used to form heat sealed pouches at "polyolefin-type" of heat seat conditions, yet the integrity of the heat seals may be maintained even when the heat seal is exposed to conventional oven conditions.
Berrier Arthur Leroy
Ebner Cynthia Louise
Cryovac Inc.
Smart & Biggar
LandOfFree
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