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1. (WO2018106243) METHOD OF ULTRASONICALLY BONDING PAPERBOARD

Pub. No.:    WO/2018/106243    International Application No.:    PCT/US2016/065594
Publication Date: Fri Jun 15 01:59:59 CEST 2018 International Filing Date: Fri Dec 09 00:59:59 CET 2016
IPC: B32B 37/00
B29C 65/08
B31F 5/00
Applicants: GENERAL MILLS, INC.
Inventors: TUSZKIEWICZ, George, A.
JORDAN, David, W.
MILLER, Thomas
NOVOTNY, Peter, L.
RONQUILLO, Jenna, M.
Title: METHOD OF ULTRASONICALLY BONDING PAPERBOARD
Abstract:
In a method of ultrasonically bonding paperboard, first and second pieces of paperboard (120, 121) are supplied, with at least one of the first and second pieces of paperboard (120, 121) being provided with a clay coating. The first and second pieces of paperboard (120, 121 ) are moistened and positioned in a gap (1 15) between a sonotrode (105) and an anvil (1 10) of an ultrasonic welding unit (100). The ultrasonic welding (100) unit is activated and the first and second pieces of paperboard (120, 121) are compressed between 30-70%, more preferably between 40-60%, to cause the clay coating to mobilize and force the clay coating material into fiber matrixes of the first and second pieces of paperboard (120, 121 ), followed by cooling of the first and second pieces of paperboard (120, 121), to bond the first and second pieces of paperboard (120, 121).