Film press
A pressure curve, pressure sensor technology, used in textiles and papermaking, papermaking, coating, etc.
Active Publication Date: 2015-12-02
VOITH PATENT GMBH
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Problems solved by technology
[0003] Furthermore, in the case of indirect application devices, such as film application devices, in which the coating medium is first applied in excess by means of the application device to the application roller and then by means of a scraping element forming a nip with the application roller (e.g. doctor bar or doctor blade) from the applicator rolls to the side of the web of fibrous material that is in contact with the applicator rolls (before the film passes from one applicator roll to the other nip through which the fibrous material web is guided, The coating medium is partially scraped off in the wiping element to form a film from the medium), there is the problem that the film provided on the corresponding applicator roller must be constructed as uniformly as possible in the cross-machine direction in order to Provides an even amount of coating medium
However, in currently available film applicators it is not possible to reliably determine on which side of the web of fibrous material too much or too little coating medium has been applied
Method used
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Embodiment Construction
[0044] figure 1 A film application device 1 according to the invention is shown in cross section for applying a pasty or fluid coating medium 8 to a running fibrous material web 2 , in particular a paper or cardboard web superior.
[0045] figure 1 The shown film application device 1 has a first nip 3 through which a fibrous material web 2 is guided and simultaneously coated on both sides with a coating medium while passing through. The first nip 3 is formed by two rollers 4 , 5 arranged adjacent to each other. The two rollers 4 , 5 of the roller pair are application rollers, so that the fibrous material web 2 is coated simultaneously on both sides 6 , 7 with the coating medium 8 by the film application device embodied in this way.
[0046] like from figure 1 As can be seen, each of the two applicator rollers 4 , 5 for supplying the coating medium in the form of a film 9 , 9 ′ is assigned to each of the applicator devices 10 , 10 ′ and with the corresponding applicator rol...
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Abstract
The invention relates to a film application mechanism for applying a pasty or fluid coating medium to a running fibrous material web, particularly a paper or cardboard web, with a roller pair forming a first nip through which the fibrous material web is guided. At least one of the rollers of the roller pair is an application roller, by which the coating medium provided in the form of a film on the application roller can be transferred in the first nip from the application roller to one side of the fibrous material web coming into contact therewith. An application device and a doctor blade element are associated with the application roller in such a manner that the coating material is first applied in excess to the application roller upstream of the first nip by means of the application device and then removed in part in a second nip by means of the doctor blade element, which together with the application roller, forms the second nip in order to form the film. The invention is characterized in that a plurality of pressure sensors, by means of which the pressure profile in the direction transverse to the machine direction in the first and second nips can be determined, are embedded in the elastic covering of the application roller.
Description
technical field [0001] The invention relates to a coating medium for applying a liquid or pasty coating medium on one or both sides to a fibrous material web, in particular a paper or cardboard web, according to the preamble of claim 1 The invention also relates to a method according to the preamble of claim 13 . Background technique [0002] It is known from the prior art to measure the pressure curve in the nip in the application device through which the fibrous material web is guided in order to apply a fluid or pasty coating medium, such as coating color or paste. Thus, for example from DE 11 2009 000 095 an applicator for direct application of coating media is known, in which applicator the pressure curve in the nip formed between the support roller and the applicator unit is measured in order to achieve Uniform application of coating medium on web of fibrous material. [0003] Furthermore, in the case of indirect application devices, such as film application devices...
Claims
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IPC IPC(8): D21H23/56D21H23/58D21H23/78D21H19/36
CPCD21H23/56D21H19/36D21H23/58D21H23/78B05C1/08B05D1/28B05D3/002
Inventor 马蒂亚斯·施米特
Owner VOITH PATENT GMBH