The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1992
Filed:
May. 24, 1990
Charles E Thomas, Baltimore, MD (US);
United Container Machinery Group, Inc., Glen Arm, MD (US);
Abstract
A paper corrugating machine is disclosed which includes a heater for preheating the medium prior to the corrugation. The heater includes a curved metal plate where channels are drilled through end faces of the plate. Slots are provided at the end faces of the plate to interconnect pairs of adjacent channels at alternate ends to form a serpentine steam passage through the plate. End caps are welded over the slots to seal the communication between the adjacent interconnected pair of channels. Steam supply ports extend into the serpentine path to steam pressurize the serpentine passage. The heater is placed in a single facer corrugating apparatus above the upper and lower corrugating rolls. A variable wrap mechanism is also disclosed which varies the angle of wrap between the medium paper and the heater.