Coating apparatus – Immersion or work-confined pool type – Work-confined pool
Patent
1996-05-09
1998-06-30
Edwards, Laura
Coating apparatus
Immersion or work-confined pool type
Work-confined pool
118414, 118419, 118123, 118126, G05C 500
Patent
active
057727660
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to application units for the direct or indirect application of a liquid or pasty medium onto a moving material web.
Such known application units are specifically equipped for their respective intended uses. On the one hand, free jet nozzle application units are built in which the liquid or pasty medium is applied via a dosing gap as a free jet. In direct application, the free jet impinges upon the moving material web, while the in indirect application free jet is applied onto an application roll, and the liquid or pasty medium is transferred from the surface thereof onto the moving material web. On the other hand, application units are built with an application chamber in which the liquid or pasty medium is applied from a chamber by means of a dosing member, for example a wiper or doctor blade member. In direct application, the medium is directly applied onto the moving material web, while in indirect application the medium is initially applied onto an application roll and transferred from its surface onto the moving material web.
A commonly known application unit with a free jet nozzle dosing gap is described, for example, in the Canadian patent application CA-A-2 101 358. Such an application unit with a free jet nozzle can be operated in a relatively uncomplicated manner, as it does not have any real wearing parts and is therefore relatively free of maintenance. It is only suitable for speeds of passage up to approximately 1500 m/min but it has a low web tear frequency and is particularly suitable for tension-sensitive, i.e. thin papers.
A commonly known application unit with an application chamber is described, for example, in the European patent application EP-A-0 496 946. Such an application unit with an application chamber is suitable for higher speeds of passage (>1500 m/min.) and effects a greater web penetration depth on account of the pressure in the application chamber. Additionally, such an application unit is suitable for low coating weights and simultaneously enables a clean coverage.
Depending on the type of application, the respectively suitable application units must be built into a coating machine. Should a change in the intended use of the coating machine require the use of a different application unit, the entire application unit must be exchanged. Such a complete conversion is very time-consuming and complicated.
The invention is therefore based on the technical problem of providing a new type of application unit which permits quick and easy conversion.
SUMMARY OF THE INVENTION
The invention is based on the concept of providing an application unit which must not be completely exchanged during conversion, for example together with the support beam, the distribution means for the liquid or pasty medium, the connecting and adjusting means and other devices. In the inventive solution according to the invention, only those members are respectively exchanged or added or removed which directly serve for application of the liquid or pasty medium. Thus, an application unit equipped according to the invention includes a basic structural group which remains in use both in connection with a free jet nozzle arrangement as well as a blade member application chamber arrangement. This basic structural group comprises the supporting beam including the distribution means for the liquid or pasty medium, the connecting and adjusting means required for these previously mentioned members as well as the forward and rearward walls for formation of the feed gap including the feed channels for the liquid or pasty medium supplied from the distribution means into the feed gap.
According to one set of embodiments of the invention, the members that directly serve for application of the liquid or pasty medium are mountable on the previously described basic structural group. These members that directly serve for the application of the medium on the one hand involve attachable members for forming an application chamber, for example a blade support with a doctor
REFERENCES:
patent: 4876982 (1989-10-01), Claassen
patent: 5112653 (1992-05-01), Damrau et al.
patent: 5436060 (1995-07-01), Damrau
Bernert Richard
Kustermann Martin
Reich Stefan
Ueberschaer Manfred
Wozny Eckard
Edwards Laura
Voith Papiermaschinen GmbH
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