US 9,809,335 B2
Method for bag closure and sealing
Mark E. Jansen, Appleton, WI (US)
Assigned to Coating Excellence International LLC, Wrightstown, WI (US)
Filed by Coating Excellence International LLC, Wrightstown, WI (US)
Filed on Oct. 2, 2014, as Appl. No. 14/505,160.
Application 14/505,160 is a division of application No. 13/569,211, filed on Aug. 8, 2012, granted, now 8,850,778.
Application 13/569,211 is a division of application No. 12/535,185, filed on Aug. 4, 2009, granted, now 8,241,193.
Prior Publication US 2015/0033676 A1, Feb. 5, 2015
Int. Cl. B65B 7/08 (2006.01); B65B 51/20 (2006.01); B29C 65/10 (2006.01)
CPC B65B 7/08 (2013.01) [B29C 65/103 (2013.01); B65B 51/20 (2013.01)] 9 Claims
OG exemplary drawing
 
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.