Patent Number: 6,251,226

Title: Apparatus for manufacturing papers with watermarks or patterns

Abstract: An apparatus for obtaining watermarks or patterns in paper or cardboard while being formed on a formation tape or table in a paper or cardboard manufacturing plant, comprising: a primary fibrous mix source for storing a primary fibrous mix; at least one manifold, which can be arranged proximate to the formation table; at least one jet nozzle which can be fed by the at least one manifold and is arranged above the formation table so that it can be angularly adjusted with respect thereto; a feeding duct for a secondary fibrous mix and a return duct from the at least one manifold; and a secondary fibrous mix source arranged to supply the feeding duct and to receive material discharged from the feeding duct for return from the at least one manifold.

Inventors: Fedrigoni; Giuseppe (Verona, IT), De Luca; Alberto (Riva del Garda, IT)

Assignee: Cartiere Fedrigoni & C. S.p.A.

International Classification: D21F 1/44 (20060101); D21F 1/00 (20060101); D21F 001/44 ()

Expiration Date: 06/26/2018