The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 22, 1995
Filed:
Aug. 19, 1993
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
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.