Henkel Kommanditgesellschaft Auf Aktien

Bayeraktiengesellschaft

Niro A/s

Niro Holdings A/s

Peter Walzel

Poul Bach

Christian Reedtz Funder

Wilfried Raehse

Richard Juffa

Ovidiu Dicoi

Soren Birk Flyger

So Slashedren Flyger

An apparatus and method for the spray drying of solvent-containing compositions. A liquid or paste-form solvent-containing composition is heated to a temperature above the boiling point of the solvent, transported under excess pressure and at a temperature above the boiling point of the solvent to a relaxation space where it is sprayed to evaporate the solvent. The relaxation space is not under excess pressure and is at a temperature that is above the boiling point of the solvent.

Device for spray-drying solvent-containing compositions

Liquid to be atomized is uniformly sprayed on the inner surface of a hollow rotating cylinder, for example by means of one- or two-fluid-nozzles and is thus distributed on apertures provided in the cylinder wall. The rotation of the cylinder causes the liquid to flow outwards through the apertures. Droplets are generated when the liquid flows out of the apertures by laminary decomposition of the jet. The flow rate in each aperture lies in the range 1.0<{dot over (V)} (a &rgr; /&sgr; ) <16 to prevent the droplets from becoming too large and to satisfy the condition of an adequate flow laminarity, i.e. for the value of the Reynolds Number for the continuous liquid flow in the apertures not to exceed Re 400. {dot over (V)} represents the flow rate of the liquid in each aperture, a represents the centrifugal acceleration at the outer surface of the cylinder, &rgr; represents the density of the liquid, and 8 indicates the surface tension of the liquid. The large number N>200 of apertures having the diameter D in the cylinder wall causes the flow rate of liquid through each aperture to be relatively low, so that a continuous laminary flow in each aperture is ensured even at low viscosities and technically useful total flow rates.

Process and a device for atomizing liquids

The liquid to be atomized is uniformly sprayed on the inner surface of a hollow rotating cylinder, for example by means of one- or two-fluid-nozzles and is thus distributed on bores provided in the cylinder wall. The rotation of the cylinder causes the liquid to flow outwards through the bores. Droplets are generated when the liquid flows out of the bores by laminary decomposition of the jet. The flow rate in each bore lies in the range 1.0&lt;V.sub.B (a.sup.3 .rho..sup.5 /.sigma..sup.5).sup.0.25 &lt;16 to prevent the droplets from becoming too large and to satisfy the condition of an adequate flow laminarity, i.e. for the value of the Reynolds number for the continuous liquid flow in the boress not to exceed Re.sub..delta. 400. V.sub.B represents the flow rate of the liquid in each bore, a represents the centrifugal acceleration at the outer surface of the cylinder, .rho. represents the density of the liquid and .delta. indicates the surface tension of the liquid. The large number N&gt;200 of bores having the diameter D.sub.B in the cylinder wall causes the flow rate of liquid through each bore to be relatively low, so that a continuous laminary flow in each bore is ensured even at low viscosities and technically useful total flow rates. Preferably cylindrical bores with a minimum length at least three times larger than the bore diameter are provided in the cylinder wall, with a narrow spacing in the range defined by 1.1&lt;t/D.sub.B &lt;5, so that a number of bores as large as possible may be arranged in the wall of the cylinder.

For improving an adequate statement about the processing properties of granulated material to be added to unvulcanized rubber a testing device is used consisting of a support for the test sample, a wedge-shaped tool and a linearly acting pressure generator, whereby as support, bearing means for agglomerates are arranged on either side of the working plane of the movable wedge-shaped tool with bearing forces acting predominantly parallel thereto.

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Dormagen, Germany

Peter Walzel