Dansk Eternit-fabrik A/s

A/s N. Foss Electric

Jens Reumert

Johan C Gregersen

Mogens Bering Larsen

Johan Dovmark

Jens P Nielsen

Hans E Jensen

Sten R Christoffersen

Method and apparatus for determining the length of a flexible web or

In order to produce a decorative pattern on the surface of a layer of material in a soft plastic condition, the surface is whipped by the free end portions of a plurality of flexible thread-like members. The whipping action provides random depressions in the surface. The thread-like members are preferably fastened to the peripheral surface of a rotatable body which is spaced from the surface to be treated at a distance which is substantially smaller than the length of the thread-like members, and the surface to be treated is moved in relation to the rotatable body while this body is rotated. By this whipping action it is possible to make surface patterns imitating a slaty surface or the surface of other natural materials. Such decorative surfaces may be made on layers of materials which are cut into plates or blocks for use as building materials after firing, setting or hardening of the material. As an example, the decorative pattern or structure may be made on plates to be used as roofing plates.

Method of producing a plate with a decorative pattern in its surface

A method of rolling a plastically deformable material which behaves as a single phase and which is deformed plastically when subject to deformation forces, which material comprises from 40% to 70% by weight of hydraulic cement and/or fly-ash particles A of from 0.5 to 100 .mu.m, silica particles B of from 50 .ANG. to 0.5 .mu.m (which are at least one order of magnitude smaller than the cement/fly-ash particles A), a surface-active dispersing system present in an amount sufficient to impart to the composite material a plastic consistency in a stress field of up to 200 kg/cm sq., and from 7% to 20% by weight water; the silica particles B being homogeneously arranged in the voids between the densely packed cement/fly-ash particles A, and the amount of water substantially corresponding to the amount necessary to fill the voids between the solid particles of the composite material. In accordance with the method, the composite material is introduced into a wedge-like space defined between oppositely arranged surface parts, at least one of which is gas-permeable, e.g., a continuous band or belt, and the surface parts are moved relative to the material so as to entrain or roll it towards and through the throat or gorge of the space. The plastically deformable material retains substantially all of its original water content and continues to behave as a one-phase, plastically deformable material after rolling, and possesses a substantially smooth and uniform outer surface without material defects.

Method of rolling a plastically deformable material

A method and apparatus for determining at least one component of a sample of a particulate material, such as grain or seed, on the basis of a permittivity value of the sample. Before measuring the permittivity value the sample is compacted to a predetermined degree, preferably by vibrating the sample. Preferably, the sample is vibrated while being introduced into a sample container or receptacle in which the sample is exposed to an alternating electric field for determining said permittivity value.

Method and apparatus for determining at least one component of a sample

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Bagsvaerd, Denmark

Johan C Gregersen