METHOD AND APPARATUS FOR BAG CLOSURE AND SEALING

摘要

A method and apparatus for sealing a bag made of a polymeric material by applying heat activated layers on different portions of the bag, wherein the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric material; after creasing the bag along a fold line, applying heat at a temperature below the softening point temperature of the polymeric material to activate the first adhesive layer and the second adhesive layer to adhesive states after the bag has been filled with contents; and folding the bag to form an adhesive-to adhesive seal by contact between the heat activated first adhesive layer and the heat activated second adhesive layer.

主权项

1. A method of pinch closing and sealing a bag made of polymeric material, comprising:
applying a heat activated first adhesive layer on a first panel of the bag; applying a heat activated second adhesive layer on a second panel of the bag including a flap portion, wherein the first adhesive layer and the second adhesive layer have respective heat activation temperatures below the softening point temperature of the polymeric material; pinch closing an open end of the bag; creasing the bag along a fold line; conveying the bag along a hot air manifold, wherein the hot air manifold has a hot air chamber; heating the second adhesive layer to an adhesive state by hot air under pressure from the hot air chamber and blown through first air passages through a top wall of the hot air chamber, wherein the second adhesive layer is heated to a temperature below the softening point temperature of the polymeric material to activate the second adhesive layer to an adhesive state; heating the first adhesive layer to an adhesive state by hot air under pressure from the hot air chamber and blown through second air passages through a back wall of the hot air chamber, wherein the first adhesive layer is heated to a temperature below the softening point temperature of the polymeric material to activate the first adhesive layer to an adhesive state; and folding the bag along the fold line to form an adhesive-to adhesive seal by contact between the first adhesive layer and the second adhesive layer.