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Method of, and apparatus for, moistening loose material
| Details |
Inventors: Schluter, Wilhelm;
Assignee: Gebruder Lodige Maschinenbau-Gesellschaft mbH (Paderborn, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A method is disclosed of applying glue to loose fibrous material which is revolved relatively rapidly in a confined space. While this is happening, the glue and air under slight excess pressure are fed to the material from approximately the center of the space. Apparatus for this purpose comprises a container, a hollow shaft rotatably mounted in the container, and a plurality of rod-like tools secured to the hollow shaft. Each of the tools is generally cylindrical, and is provided with a central longitudinal bore one end of which opens into the hollow shaft and the other end of which is closed. Each tool has a longitudinally-extending flat external surface portion, and a plurality of substantially radial bores communicating with the central longitudinal bore. The radial bores of each tool terminate at the external surface of that tool in the zone of said flat portion thereof. Thus, glue can flow through the hollow shaft and be broken down into droplets as the glue is flung out of the radial bores of the tools by the centrifugal force caused by rotation of the hollow shaft. |
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DETAILED DESCRIPTION The present invention provides a method of moistening loose material which is revolved relatively rapidly in a confined space by causing a moistening agent to flow approximately from the centre of the space, wherein air under slight excess pressure is supplied together with the moistening agent.
Thus, according to the invention, the moistening agent, such as glue, is caused to flow under virtually no pressure to the loose material that is to be moistened, by means of a centrifugal effect which results in the breaking down of the moistening agent into small drops or droplets.
At the same time, air is blown in under slight excess pressure, for example, at a maximum pressure of 5 bars.
Thus, the air flows at a greater velocity than does the moistening agent.
The moistening agent is thus broken down into extremely fine droplets.
Immediately following the breaking down into very fine droplets, these are caused to eddy in the air so that they cannot, as in the prior art method, pass into the loose material in a manner similar to a jet of liquid.
Instead, they are deflected from such a path, the degree of deflection increasing with the eddying effect.
This results in a spray pattern similar to that provided by a two-component nozzle, but without the need for supplying the moistening agent under pressure.
When glue-coating fibrous loose material, such as wood fibres, it is necessary that the glue, which is broken down into very fine droplets, should have a minimum droplet size.
Otherwise, the coating of glue on the individual particles of loose material would be too thin, and the moisture content of the glue would drop too rapidly, so that the glue would not have sufficient adhesive power.
By means of the method of the invention, a glue-air mixture, which meets this requirement, is passed to the loose material.
This glue-air/mixture is filtered, as it were, on passing through the particle mass forming the loose material, and this mass is coated with glue in a much more uniform manner than has been hitherto possible
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Obesity Surgery 
