Coating apparatus – Solid member or material acting on coating after application – Rotary member
Patent
1990-04-09
1992-08-04
Wityshyn, Michael G.
Coating apparatus
Solid member or material acting on coating after application
Rotary member
118122, 118123, 118124, 118126, 118413, 118414, 118419, B05C 1104
Patent
active
051349582
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an apparatus for applying fluent material, such as optionally foamable substances of differing viscosity, coating substances, varnishes, adhesives, pastes, etc., to a substrate, such as a web of material. The material is applied with a pressing part that engages a substrate with a magnetic device for operating the pressing part. Such an apparatus is used for flat stencil printing, round stencil applications and/or for stencil-free, full-surface applications. The application width of the pressing part can be several meters. As a function of the intended use, it is possible to carry out patterning applications (printing) and/or full-surface applications (e.g. impregnation, coating, dyeing, varnishing).
Squeegee devices are known (DE-AS 1 135 856), in which a magnetizable doctor can be magnetically pressed against a magnetic beam or bar extending with the doctor below and along the substrate path. It is also known to provide on the back of a sheet spreading doctor a magnetizable strip fixed to the doctor over the application width, so that by means of the strip the doctor can be pressed against a substrate by the magnetic force of a magnetic beam or bar (DE-OS 34 19 590). In yet another squeegee device (DE-OS 25 44 784), a squeegee or doctor roller can be magnetically pressed onto the back of a separately arranged profile strip spaced from the rolling surface of said roller. It is always necessary for the magnetic pressing of the doctor within a printing press to provide a machine-stationary magnetic beam, which is optionally connected via a machine frame to the bearing of the doctor. The magnetizable mass of the doctor or a support part non-detachable connected in one-piece manner thereto must be designed in accordance with the size of the desired magnetic force to be produced. This leads to relatively large application machines, which must be specially designed for each application type and must be designed and constructed with adapted components.
SUMMARY OF THE INVENTION
The task of the present invention is to provide a particularly simple and compact, easily handlable and universally usable application apparatus with a pressing part (coating profile), which is to be usable as a constructional unit with a random desired coating profile. In simple manner it must be possible to position the constructional unit on any substrate path along a magnetizable body.
In conjunction with the features of the aforementioned application apparatus, this problem is solved in that the magnetic device has at least one electromagnet and/or permanent magnet placed on the pressing part that together with the latter forms a pressing unit. The application apparatus comprises a holding part for holding the magnetic device that is movable in the direction of the substrate path under magnetic attraction against a magnetic or magnetizable body with at least one edge of the pressing part passing over the application width. The application apparatus according to the invention forms a compact pressing unit, which can be installed as an easily handlable component at any desired place of use. Machines can easily be reequipped with such a pressing unit, said machines guiding or holding a substrate to be printed or coated such as a material web or any other flat part to be treated on or at a magnetizable support member. In machines intended exclusively for applications, the pressing unit forms a universally usable, compact machine component leading to a considerable simplification of the construction of such machines. An important characterizing feature of the invention is that the pressing part is an integral component of a unit producing a magnetic force. This constructional unit comprises as such the essential elements necessary for an application, so that essential functions can be combined into a single apparatus. The desired doctor profile is provided by a pressing part. An electromagnet and/or permanent magnet device is located directly on the pressing part and produces the des
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