Patent · US Active

Device for thermoforming a plastic film

US9694534B2 · kind B2 · utility

0Cited by

7References

12Claims

0Family size

Assignee

Essilor International (Compagnie Generale d'Optique) · FR

Inventor

Eric Roussel · Charenton-le-Pont, FR

Key dates

Filing date	Dec 17, 2014
Grant date	Jul 4, 2017
Priority date	—
Expiry date	Nov 11, 2035

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2011/0016
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A thermoforming device heats a plastic film to a substantially uniform temperature, in order to impart a curved shape to said film. The device includes a chamber, the internal pressure of which is variable and which is closed by the film, a system for measuring a sag in the film arranged outside the chamber and opposite said film, and a system for heating the film. The heating system includes a hot air blowing unit which is suitable for producing a hot airflow flowing parallel to the film between two opposite edges of said film.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.