公开(公告)号：US20170368761A1

公开(公告)日：2017-12-28

申请号：US15538396

申请日：2015-12-17

Applicant: BASF SE

Inventor： ECKHARD NEUFELD ,  Carsten SANDNER ,  Tim DIEHLMANN ,  Franz-Josef DIETZEN ,  Dietrich SCHERZER

IPC: B29C65/14 ,  B29C65/00 ,  B29K101/12 ,  B29L9/00 ,  B29K105/00 ,  B29L7/00 ,  B29K105/04

CPC classification number: B29C65/1432 ,  B29C65/103 ,  B29C65/1412 ,  B29C65/1467 ,  B29C65/148 ,  B29C65/72 ,  B29C65/7847 ,  B29C66/02241 ,  B29C66/1122 ,  B29C66/45 ,  B29C66/71 ,  B29C66/727 ,  B29C66/73117 ,  B29C66/73132 ,  B29C66/7352 ,  B29C66/73921 ,  B29C66/8322 ,  B29C66/91423 ,  B29C66/9161 ,  B29C66/9192 ,  B29C66/91943 ,  B29C66/929 ,  B29K2101/12 ,  B29K2105/04 ,  B29K2105/256 ,  B29L2007/002 ,  B29L2009/00 ,  B29K2023/00 ,  B29K2025/06 ,  B29K2033/08 ,  B29K2033/12 ,  B29K2067/003 ,  B29K2075/00 ,  B29K2081/06

Abstract: The invention relates to a process for the production of at least two-layer thermoplastic sheets via thermal welding of at least one thinner thermoplastic sheet with density (D1) and of at least one second thinner thermoplastic sheet with density (D2), where the density (D1) of the first thinner thermoplastic sheet is smaller than the density (D2) of the second thinner thermoplastic sheet. The process introduces at least one first heating element and at least one second heating element along mutually offset planes between the two thinner thermoplastic sheets, where the surfaces of the thinner thermoplastic sheets do not touch the surfaces of the heating elements. The first heating element transfers a quantity of energy (E1) to the surface of the first thinner thermoplastic sheet, and the second heating element transfers a quantity of energy (E2) to the surface of the second thinner thermoplastic sheet, where the quantity of energy (E1) is smaller than the quantity of energy (E2).