Patent ID: 6939425
Filing Date: 2005-09-06
Classification: B29D,Y10T

Abstract:
1. A method of manufacturing multi-sheet corrugated material from first and second sheets which are adhered together, the first sheet having a wave shape defined by parallel-extending peaks and valleys, comprising: feeding the first sheet and the second sheet simultaneously; feeding the first sheet in a direction parallel to the peaks and valleys; orienting a plurality of elongated core bars to extend parallel to one another and to fit within the valleys of the first sheet while adjoining the peaks of the first sheet; feeding the first sheet onto the plurality of core bars with each core bar located in a valley and adjoining a peak of the first sheet; bringing the peaks of the first sheet into abutting contact with the second sheet at abutting contact portions of the sheets as the sheets are fed simultaneously; heating at only the abutting contact portions of at least one of the first and second sheets by transferring energy only from each core bar to heat the abutting contact portions as the first sheet is in motion; pressing the first and second sheets together at the abutting contact portions while at least one of the first and second sheets is heated to thereby adhere the two sheets together at the abutting contact portions; and performing said heating and pressing of the abutting contact portions as the sheets are in motion from said simultaneous feeding.