Patent · US Expired

Device for generating a subatmospheric pressure

US5443638A · kind A · utility

9Cited by

11References

19Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Uwe Gartmann · Eltville am Rhein, DE
Hermann Idstein · Oestrich-Winkel, DE
Guenter Hultzsch · Wiesbaden, DE

Key dates

Filing date	Aug 19, 1993
Grant date	Aug 22, 1995
Priority date	—
Expiry date	Aug 19, 2013

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB05C5/0266
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

A device for generating a subatmospheric pressure at a coating layer on a web-shaped carrier material which is guided over a coating roll. The device is provided with a pressure chamber which is pressurized symmetrically with compressed air via two end-face inflow openings. The compressed air is fed symmetrically to the inflow openings via a manifold unit. From the pressure chamber, the compressed air emerges via a so-called Laval nozzle, thereby generating in a region above the nozzle a subatmospheric pressure which acts on the meniscus of the coating layer during the transition from the gap of the coating die onto the carrier material. Movable seals are provided to permit the width of the nozzle to be adapted to the coating width of the carrier material.

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