Patent ID: 6679031
Filing Date: 2004-01-20
Classification: B29B,B29C,B29L,B65B

Abstract:
A method for forming a blister band (1) for blister packs (10) in a blistering machine (M), comprising feeding a band (1) of heat-formable material intermittently through a preheating station (5), a forming station (6) for forming a regular series of blisters (20) to obtain a blister band, a filling station (8) for filling said blisters (20) with articles, a sealing station (9) for sealing the blister band with a sealing band (11), and a cutting off station (13) for cutting the blister band into single blister packs (10), wherein in said preheating station (5), the method further comprises gradually heating a plurality of selected areas (24a, 24b, 24c) of said heat-formable band (1) during a stepwise movement of said heat-formable band (1) therethrough, said selected areas (24a, 24b, 24c) of said heat-formable band (1) being distributed regularly within a cold grid zone and each selected area being of an extent bigger that an extent of said blisters (20) made in said selected heated areas (24a, 24b, 24c); and placing the heating means (14a, 14b, 14c) equally distant vertically from said heat-formable band (1) and differentially heating the selected areas by supplying increasing amounts of heat thereto.