公开(公告)号：US3825441A

公开(公告)日：1974-07-23

申请号：US23152272

申请日：1972-03-03

Applicant: BOISE CASCADE CORP

Inventor： ACHERMANN W ,  ACHERMANN F

IPC: D21H21/56 ,  D21H23/30 ,  D21H23/50 ,  D21H23/68 ,  B44D1/02

CPC classification number: D21H23/68 ,  D21H21/56 ,  D21H23/30 ,  D21H23/50 ,  Y10T156/1025

Abstract: METHOD FOR IMPREGNATING CORRUGATED CARDBOARD DURING THE MANUFACTURING PROCESS FORMING THE SAID CORRUGATED CARDBOARD, AND RESULTANT PRODUCT. A VACUUM IS FORMED WITHIN THE CORRUGATIONS OF THE CARDBOARD AND IMPREGNATING MATERIAL IS INTRODUCED INTO THE CORRUGATIONS UNDER THE INFLUENCE OF THE SAID VACUUM. THE IMPREGNATING MATERIAL IS INTRODUCED UNDER CONDITIONS WHICH MAY BE VARIED WITH RESPECT TO COMPOSITION, TEMPERATURE, VISCOSITY AND OTHER

VARIABLE PROCESS PARAMETERS. THE APPARATUS OF THIS INVENTION INCLUDES A MEANS FOR PRODUCING A SUCTION ON ONE EDGE OF ACORRUGATED CARDBOARD WHILE INTRODUCING IMPREGNATING MATERIAL AT THE OTHER EDGE OF THE CORRUGATED CARDBOARD AS IT PASSES THROUGH THE IMPREGNATING APPARATUS.