Patent ID: 6171427
Filing Date: 2001-01-09
Classification: B31F,Y10T

Abstract:
An apparatus for forming a single face corrugated web from a fluted medium web and a liner web, the apparatus comprising:a rotary fluted bonding roll carrying the fluted medium web;a glue applicator that applies a starch adhesive to exposed flute tips on the fluted medium web carried on the bonding roll, the applied adhesive forming uncured glue lines on said exposed flute tips;a liner roll introducing the liner web to the fluted medium web on the bonding roll such that the liner web initially contacts the exposed flute tips of the medium web on the bonding roll along a web convergence line and remains substantially in contact with the flute tips downstream of the web convergence line to permit initial bond formation between the flute tips on the medium web and the liner web along the glue lines; anda steam shower that injects a steam cloud between the fluted medium web on the bonding roll and the liner web introduced from the liner roll directly at the web convergence line, thereby providing additional heat to gelatinize the starch glue lines between the flute tips on the medium web and the liner web such that substantial starch adhesive gelatinization occurs after the liner web is introduced to the fluted medium web on the bonding roll.