Patent ID: 6090028
Filing Date: 2000-07-18
Classification: B31B,B32B,B65D,Y10S,Y10T

Abstract:
A method of making a tubular web comprising a plurality of tube lengths which can be made into a bag suitable for use in microwave cooking comprisingproviding a flat web of flexible material for use in forming a tube, said web of material having a plurality of successive lengths of equal size, each length of said web having a first deposit of a cold seal adhesive at its one end and a second deposit of heat seal adhesive at its other end,forming said flat web into a tubular web comprising a plurality of tube lengths having a plurality of opposed side panels, each of said tube lengths having said first cold seal and hot seal adhesive deposits at the ends thereof,said first cold seal deposit of a cold seal adhesive being for bonding a top first end of the tube together such that the bond at ambient temperatures cannot be opened without tearing the flexible material of the tube and such that the bond at elevated temperatures produced in microwave cooking softens the cold seal bond to form a peelable closure that may be opened without tearing the flexible material of the tube,applying pressure to said opposed side panels of each tube length at locations whereat said cold seal deposit is located to form a cold seal closure extending thereacross whereby each tube length is closed at one end by said cold seal closure, andforming said tubular web into a roll from which a plurality of bags can be made.