Device for coating moving webs of paper or board

Details Device for coating moving webs of paper or board Device for coating moving webs of paper or board

1994-01-11

1995-04-25

Jones, W. Gary

Coating apparatus

Solid applicator contacting work

With means to support applicator on body or clothing

118205, 118231, 118232, 118257, B05C 100

Patent

active

054095344

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a coating device for coating a paper web, or the like web of material, and particularly to a belt coater and to the support for the belt at the coating nip or gap. The coating belt is trained around a curved guide surface of a support, the guide surface being at the coating gap. The support is supported on a rail. Pressure means, like a hose, between the support and the rail keeps the guide surface at a preferred orientation.
German patent publication DE 41 00 771 A1 discloses such a device. In this case, the pressure hose serves to compensate for bending or to adjust the bend for the support member with the curved guide surface. Variations in hydrodynamic forces, occurring along the web, on the support member in the course of the coating operation however the support member to bend so that equalization of such flexure is necessary.
This object of equalizing such flexure is to be attained with the invention. The coating device of the invention is used for coating moving webs of material, more particularly webs of paper or board. An endless belt is trained to pass over a curved guide surface of a beam or rod-like support member. A drive roll drives the belt to move over the curved guide surface. A cooperating web supporting roll supports the web near to the belt at the curved guide surface to define a coating gap between them. A support beam extends parallel to the web supporting roll and supports the support member. First pressure means are disposed between the support member and the beam to apply force to the support member in a direction toward the coating gap and the web supporting roll. Second pressure means are disposed at the one side of the support member and at the support beam as to apply a force essentially in a direction transverse to the direction of force applied by the first pressure means and also opposing the force applied on the support member by the belt moving through the coating gap and applying coating on the guide surface. The first and second pressure means may be pressure hoses or other pressure applying means such as piezo translators, hydraulic pistons operating in pressure cylinders, thermally or magnetically driven servo elements. The drive means for the belt comprises one drive roll in the belt which has a diameter and radius of curvature significantly larger than the radius of curvature of the curved guide surface.
In order to aid in relative shifting of the support member, particularly with reference to the second pressure means, the second pressure means, such as a pressure hose, is in contact with an intermediate member disposed between the second pressure means and the support member. The intermediate member and the extension of the support member are mutually smooth and slidable with respect to each other to absorb relative sliding motion of the support member with respect to the support beam.
It is an advantage if only one single drive roll is provided for the belt or, respectively, for the hose, because then the radius of curvature of the guide surface of the support member may be designed to be relatively small, something which is very desirable. It is furthermore possible to have two guide or drive rolls for the hose, the diameter of such rolls being able to be 400 and 900 mm. It is then naturally possible for the curvature radius of the guide surface of the support member not to be so small.


BRIEF DESCRIPTION OF THE DRAWINGS

In what follows the invention will be described with reference to the figures which illustrate preferred embodiments; the FIGS. 1 and 2 are diagrammatic cross sections taken through the coating device and, respectively, on a larger scale through another working embodiment.
As shown in FIG. 1 the rail- or beam-like support member 1 is arranged to be parallel to a cooperating roll C on which the web travels through the coating gap or nip. The member 1 is supported by a beam 3 which is beneath and parallel to the support member 1, such supporting action is first achieved by a pressure hose 4 arranged at the end of a rib-

REFERENCES:
patent: 4027623 (1977-06-01), Adler
patent: 4892057 (1990-01-01), Zimmer
patent: 5253495 (1993-10-01), Zimmer
patent: 5255539 (1993-10-01), Zimmer

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