Coating apparatus – With heat exchange – drying – or non-coating gas or vapor... – To manipulate work by gas blast
Patent
1988-09-02
1990-07-10
Hoag, Willard
Coating apparatus
With heat exchange, drying, or non-coating gas or vapor...
To manipulate work by gas blast
118 56, 118121, 118122, 118123, B05C 1102
Patent
active
049400134
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an apparatus for coating of fabric webs which utilizes a magnetic element or a stationary magnetic cylinder, located on one side of the fabric web, to magnetically attract an application device, located on the opposite side of the fabric web, into contact with the fabric web.
According to No. AT-A-289 158, when a magnetic beam is used for causing a squeegee-type coating application device to press against a web of fabric, a support body has generally been provided through the row of electromagnets which make up the magnetic element. The support body has an indentation facing the squeegee-type coating application device and is covered by a metal slide plate. This arrangement, however, acts in a manner similar to a standard air squeegee, in which only the metal slide plate opposes the pressure exerted by the squeegee against the fabric web.
SUMMARY OF THE INVENTION
Various efforts have been made to provide a suitable support for the squeegee body and have included flattening the area which supports or contacts the squeegee, and distributing the forces introduced by the squeegee as evenly as possible over as large a surface as possible. Starting from this premise, it was in no way obvious that it would be possible to use the principle of magnetic pressure in a process for coating both sides of a fabric web by use of a squeegee device. Tests done by the applicant have surprisingly shown that it is possible, according to the invention, to provide a second squeegee device on a side of the fabric web opposing the first squeegee device and a magnetic element or a stationarily arranged magnetic cylinder for attracting the first squeegee device toward the fabric web and toward the second squeegee device.
Although various physical embodiments are contemplated, each embodiment will include a magnetic element (or a magnetic cylinder) for attracting a pressure body, which either itself forms a squeegee device or presses against a squeegee device which applies an almost linear stress to the fabric web. The force which creates the linear stress is opposed by the squeegee device on the same side of the fabric web as the magnetic element. The squeegee device on the same side of the fabric web as the magnetic element can be a flexible metal or plastic blade which, in a known manner rests against the magnetic element, or an element, mounted to the magnetic element, which extends toward the fabric web at an acute angle and contacts the fabric web at a location opposite the location where the opposing, magnetically attracted squeegee device contacts the web.
BRIEF DESCRIPTION OF THE DRAWING FIGURES
Details of the invention are further explained below in connection with the drawing figures, in which:
FIG. 1 shows a cross-sectional view of a first embodiment of the present invention;
FIG. 2 shows a first variation of the squeegee device shown in FIG. 1;
FIG. 3 shows a second variation of the squeegee device;
FIG. 4 shows a third variation of the squeegee device;
FIG. 5 shows a fourth variation of the squeegee device;
FIG. 6 shows a fifth variation of the squeegee device;
FIG. 7 shows a sixth variation of the squeegee device;
FIG. 8 shows a cross-sectional view of a second embodiment of the present invention;
FIG. 9 shows a cross-sectional view of a third embodiment of the present invention;
FIG. 10 shows a first variation of the squeegee device shown in FIG. 9; and
FIG. 11 shows a second variation of the squeegee device shown in FIG. 9.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the invention in which the fabric web 3 is disposed vertically and is fed upwardly between two squeegee devices 2 and 4. In this embodiment, the fabric web 3 runs across cylinders 6, 6' and through a trough 7 which contains a compound to be applied to the fabric. As the fabric web is moved through the trough 7, it is covered on both sides with this compound. The arrangement of and pressure exerted on the fabric web by squeegee devices 2 and 4, as the fabric web 3 is move
REFERENCES:
patent: 3335701 (1967-08-01), Verkinderen et al.
patent: 3518109 (1970-06-01), Halley
patent: 3897578 (1975-07-01), Kanda et al.
patent: 3939799 (1976-02-01), Kanbara
patent: 4655166 (1987-04-01), Nishimura et al.
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