Coating apparatus – Solid member or material acting on coating after application – Rotary member
Patent
1991-03-05
1992-12-15
Wityshyn, Michael G.
Coating apparatus
Solid member or material acting on coating after application
Rotary member
118126, 118413, 118414, 118419, B05C 1102
Patent
active
051707438
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/AT90/00066 filed Jul. 4, 1990 and based upon Austrian national application A 1649/89 filed Jul. 6, 1989 under the International Convention.
1. Field of the Invention
The invention relates, to a doctor blade device and as well as to a process using this doctor blade device.
2. Background of the Invention
A large number of processes of various kinds are known for applying flowable substances to or scraping flowable substances from flat surfaces, e.g. transfer surfaces. The processes include spreading processes, coating processes using doctor rollers, applications with dosing rollers or applications by extrusion through nozzle slots.
SUMMARY OF THE INVENTION
The invention comprises a doctor blade device for applying, applying and scraping off, or for the metered application of flowable and spreadable substances, optionally with the use of a stencil, on preferably moving webs of material or other flat surfaces with variable amounts to be applied by means of a roller acting under magnetic pressure (directly or indirectly acting magnetic pressure) or by means of a cylindrical rod, whereby this application roller, or cylindrical rod cooperates with a sectional bar co-influencing the application process.
According to the invention the sectional bar co-influencing the application process is mounted on the application roller or the cylindrical rod or is connected therewith and surrounds it like a sleeve bearing basically over its entire length and in any case over the area of the respective application width and covers a large portion of the shell surface of roller or of the cylindrical rod. The sectional bar is rotatable about the axis of the application roller or the cylindrical rod.
In short, the device of the invention consists in providing two main working components or namely an application roller, cylindrical rod and a sectional bar surrounding the cylindrical rod like a sleeve bearing and provided with a surface suited for application. The two components are connected to each other through an opening shaped like a sleeve bearing so that operationally the assembly is almost a single-component articulated structure.
A large quantitative and qualitative variability results, as well as precise, accurately reproducible, automated control capability of the application process, and at the same time an applicability to the most varied substrates and with various coating substances. It is also possible, depending on the substrate, substance and final product, to achieve an in-depth application, such as impregnation, or a less penetrating application of the substance or merely a sparse superficial coating covering the entire surface of the substrate, so that the substrate can have an application surface with a novel appearance and which is modified from the point of view of weight and value increase, with improved utility. With the new process technique, the thickness of the applied layer can range for instance from 0.5 mm to 1.0 mm.
Each application process can be generally broken down approximately into the following individual process steps:
(a) Supply of the substance with a surplus or with excessive pressure either directly onto the substrate or to the application device,
(b) performing at least one step in order to meter the amount to be applied (amount of coating per surface unit),
(c) performing at least one step in order to achieve the best possible uniformity of application over the entire application width, and
(d) the actual transfer process.
A particularly advantageous characteristic of the new process technique according to the invention is that when devices produced for this process are used, the previously described four discrete process steps (a) to (d) become so variable and mutually attuned, that with one and the same technique of the invention, application device built according to the invention, a large variety of coating substances of very different viscosities in very different amounts can be applied uniforml
REFERENCES:
patent: 3029779 (1962-04-01), Hornbostel
patent: 3084663 (1963-04-01), Warner
patent: 4658753 (1987-04-01), Eklund
patent: 4920914 (1990-05-01), Zimmer
patent: 4993352 (1991-02-01), Zimmer
Dubno Herbert
Wityshyn Michael G.
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