Patent ID: 11890659
Assignee: BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  C  H  Y | IPC B  C  H

Claim 0:
1. A process for the production of thin metal-based foils, comprising the acts of:
providing an extruder, a coolant bath, and a rolling system comprising at least two rollers;
extruding a metal through the extruder to form a preliminary foil, wherein the preliminary foil has a thickness from 100 to 150 μm;
cooling the preliminary foil in the coolant bath containing liquid nitrogen at a temperature between 63 K and 77 K; and
then rolling the preliminary foil at least once in the rolling system comprising at least two rollers to form a thin metal-based foil with a thickness from 5 to 80 μm, wherein during rolling, the preliminary foil is kept below its tear threshold by increasing the temperature of the center of the foil,
wherein the rolling system is cooled by the same coolant used in the coolant bath, and wherein the rolling system is not immersed in the coolant bath.