Arrangement for impregnating webs of porous material

Details Arrangement for impregnating webs of porous material Arrangement for impregnating webs of porous material

D - Textiles, Paper

21

H

D21H 23/32 (2006.01) B29B 15/12 (2006.01) D06B 3/20 (2006.01) D21H 23/58 (2006.01)

Patent

CA 2174858

In known pressure impregnating devices there is a chamber, which continuously narrows in the transport direction, between a cylinder around which the web to be impregnated loops, and the inner wall of a trough containing the impregnating agent. The impregnating agent is supplied to the chamber under high pressure, which is further increased in the chamber by dynamic effects. Sealing problems arise at the inlet and outlet slits as well as at the front faces because of the high pressure. Disruptions in the operation can be created by fluff coming loose from the paper web as well as by impregnating agent penetrating between the sliding faces. The invention is intended to remedy these disadvantages. With the novel device the seals have alternating narrow gaps and wide grooves (12, 23, 24) in the form of a labyrinth seal. The grooves (12, 23,,24) are provided with drain openings (14, 25, 26) for the impregnating agent flowing through (Fig. 1).

Dans des dispositifs connus d'imprégnation sous pression, une chambre qui se rétrécit en continu dans la direction de transport se situe entre un rouleau entouré par la bande à imprégner et la paroi intérieure d'un bac qui contient le milieu d'imprégnation. Le milieu d'imprégnation est amené à la chambre sous une haute pression qui augmente davantage dans la chambre par des effets dynamiques. Cette haute pression cause des problèmes d'étanchéité aux fentes d'admission et d'écoulement, ainsi qu'au niveau des côtés frontaux du dispositif. Le fonctionnement du dispositif peut être perturbé par des peluches qui se détachent de la bande de papier ainsi que par le milieu d'imprégnation qui pénètre entre les surfaces de glissement. L'invention vise à réduire ces inconvénients. Dans un nouveau dispositif, les garnitures d'étanchéité ont des fentes alternativement étroites et larges (12, 23, 24), à la manière de garnitures d'étanchéité à labyrinthe. Les rainures (12, 23, 24) sont pourvues d'orifices d'écoulement (14, 25, 26) du milieu d'imprégnation qui les traverse.

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