Patent ID: 9393754
Filing Date: 2016-07-19
CPC Classification: B31F,Y10T

Claim Text:
1. A single facer comprising: a first corrugating roll and a second corrugating roll being intermeshing with each other to shape a fluted corrugated medium, the first and second corrugating rolls each having a fluted outer periphery surface; a gluing unit that applies glue to a flute tip of the fluted corrugated medium; and a pressure unit that presses the glued fluted corrugated medium and a back liner to bond them together, in conjunction with the first corrugating roll which is located at a corrugated medium feed direction downstream side, wherein a curvature of an arcuate surface of a crest on the second corrugating roll, which is located at a corrugated medium feed direction upstream side, is configured to be greater than a curvature of an arcuate surface of a crest on the first corrugating roll, and wherein the single facer is capable of manufacturing a double-faced corrugated cardboard sheet wherein a curvature of an arcuate surface of the fluted corrugated medium shaped in a joint portion with a front liner is greater than a curvature of an arcuate surface of the fluted corrugated medium shaped in a joint portion with the back liner protecting an article to be packaged.