Method for producing multi-layered thermoplastic plates by means of thermal welding of different plates

US10232556B2 · kind B2 · utility

Assignee

• BASF SE (Ellwanger & Baier Patentanwälte) · DE

Inventors

• Eckhard Neufeld · Ludwigshafen am Rhein, DE
• Carsten SANDNER · Bad Dürkheim, DE
• Tim DIEHLMANN · Bad Kötzting, DE
• Franz-Josef Dietzen · Haßloch, DE
• Dietrich Scherzer · Neustadt, DE

Key dates

• Filing date: Dec 17, 2015
• Grant date: Mar 19, 2019
• Expiry date: Feb 21, 2036

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2009/00
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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).