Coating apparatus – Solid applicator contacting work – With work-handling or work-supporting
Patent
1987-04-17
1989-01-10
McIntosh, John
Coating apparatus
Solid applicator contacting work
With work-handling or work-supporting
118262, B05C 108
Patent
active
047965592
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for applying a liquid to a web of material.
Apparatuses of that kind are used for example on roller lacquering or enamelling machines for lacquering or enamelling paper or cardboard. The web of material which has possibly been subjected to a preliminary treatment and which may or may not have printing thereon is moved past the applicator roller which applies a film of lacquer to the web of material. The coated web is then passed to a drier which for example depending on the nature of the lacquer causes hardening or drying of the coating by UV-polymerisation or by means of infrared irradiation.
Known roller lacquering or enamelling machines can apply the film of lacquer to the web of material in a co-directional or a counter-directional mode. However, to change the mode of operation of the machine, it is necessary to convert the machine: when providing a coating in the co-directional mode, the reservoir zone is arranged upstream of the point of entry of the web of material into the applicator roller, as considered in the direction of feed of the web of material, while in a counter-directional coating mode the metering roller or the reservoir zone is arranged downstream of the applicator roller as considered in the direction of feed movement of the web of material. In both situations, the film of lacquer leaves the reservoir zone with the liquid to be applied through a thin gap formed between the metering roller and the applicator roller.
In order to convert the machine from the co-directional coating mode to the counter-directional coating mode, either a second metering roller has to be moved towards the applicator roller and the first metering roller has to be taken out of engagement, or it is necessary to provide separate mounting locations for the metering roller in both modes of operation, which then requires conversion of the coating installation in each case. In that connection, particular problems are encountered in regard to the feed of liquid or lacquer to be applied to the two metering rollers, or in regard to conversion thereof, for different modes of operation. Conversion is also very expensive as it is first necessary to clean the rollers, for which purpose the liquid which is still to be found in the reservoir zone has to be removed. The conversion operation takes time and requires operating personnel.
An object of the present invention is therefore of providing an apparatus of the kind set forth in the opening part of this specification, wherein conversion of the metering roller is no longer necessary and in which the film of liquid is taken from the same reservoir zone both in the co-directional coating mode and also in the counter-directional coating mode.
In accordance with the invention, there is provided apparatus for applying a liquid to a web of material, comprising an applicator roller, means for driving the applicator roller in both directions of rotation, means for advancing the web of material under the applicator roller tangentially in relation to the surface thereof such that it moves in the same direction as or in the opposite direction to the direction of movement of the adjacent surface of the roller dependent upon the direction of rotation of the roller, and a metering roller which can be adjusted toward the applicator roller and which is so arranged that in conjunction with the applicator roller it forms a reservoir zone for the liquid to be applied, such that in a first direction of rotation of the applicator roller the liquid will flow downwardly through a gap formed at the bottom of the reservoir zone between the applicator roller and the metering roller and from there is conveyed by the applicator roller directly onto the web of material, and in a second opposite direction of rotation of the applicator roller the liquid is conveyed away from the reservoir zone freely upwardly and is conveyed as a liquid film by the applicator roller over the highest point of the applicator roller and onto the web of material, and wherein there is pro
REFERENCES:
patent: 2513394 (1950-07-01), Barrett et al.
patent: 2946307 (1960-07-01), Warner
patent: 3716019 (1973-02-01), Carter et al.
patent: 3926148 (1975-12-01), Honsel
patent: 4237816 (1980-12-01), Shimono et al.
Hinds William R.
McIntosh John
Ulrich Steinemann AG
LandOfFree
Apparatus for applying a liquid to a web of material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for applying a liquid to a web of material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for applying a liquid to a web of material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2102502