Firma Carl Freudenberg

Carl Freudenberg Kg

Nora Systems Gmbh

Gerhard Graab

Klaus Heckel

Dieter Rischer

Alfons Butscher

Hans-Michael K&uuml;hl

Helmut Gr&uuml;nhag

Hans-Michael Kuhl

Thorsten Nahe

Gregor Grun

Peter Spissinger

Torsten Nahe

Gerhard Heidecke

Herbert Arnold

Walter Hoche

Ralf M&ouml;ller

Rudiger Voll

Hans-Gunter Scholz

Peter Platzer

Ulrich Feyerabend

Hans-Michael Kühl

Jochen Schmitt

A floor covering of an elastomer material having a textured surface having a plurality of unevenly distributed reliefs, which partially overlap one another and are of a rectangular or square shape having rounded corners and extents of between 1.2 and 6 mm, the height of the reliefs being between 0.01 mm and 0.1 mm.

Floor covering of an elastomer material having a textured surface

A table- or workbench covering made of a first electrically conductive layer having a specific resistance in the range of 5&#xd7;10&#x3a9;cm to 5&#xd7;10&#x3a9;cm, and a second electrically conductive layer having a specific resistance in the range of 5&#xd7;10&#x3a9;cm to 5&#xd7;10&#x3a9;cm, the layers being made of rubber mixtures containing antistatic agents and/or electrically conductive particles and are calendered together as well as connected by vulcanization, and which have a sulfate content of &#x3c;100 &#x3bc;g/cm, extractable using deionized water.

Table or workbench covering

A floor covering made up of at least two layers bonded to one another, including a bottom layer ( ) of electrically conductive rubber arranged under a light-colored top layer ( ) of rubber, where the top layer ( ) is interrupted in partial areas distributed over its area in a pattern, and formed by electrically conductive rubber there. The top layer ( ) is produced from a powder ( ) of first particles ( ) that are light in color and made of electrically insulating rubber, as well as second particles ( ) embedded in it, which are made of electrically conductive, at least partially vulcanized rubber. The second particles ( ) have a diameter D, determined by screen analysis, that is at least as great as the thickness D of the top layer and, for practical purposes, not greater than the total of the thicknesses of the top layer and the bottom layer D . The first ( ) and the second ( ) particles are pressed together and to the bottom layer ( ), without pores, and bonded by vulcanization. At least one of the second particles ( ) is present per area unit of the floor covering of 31.7 cm , with the proviso that a maximum of 50% of the total area of the floor covering is taken up by the area of the second particles ( ).

Floor covering

A web-type floor covering made of vulcanized rubber that includes an elastic rubber web, the top side of which forms a decorative surface, first decorative particles being at least partially embedded in the rubber web so that the first decorative particles are visible from the top side, a transparent coating, in particular made of epoxy resin, being applied to the first decorative particles on at least part of their contact surface with the rubber web, the first decorative particles being preferably made of a different material from that used for the rubber web.

Web-type floor covering and method for its manufacture

A method to produce an electrically conductive floor covering made of first particles of a polymer material which are surrounded with electrically conductive second particles and compressed in the intermediate space between the top and bottom sides of the floor covering, with the floor covering having at least one cut surface and the electrically conductive second particles forming conductive paths which connect the upper side and the lower side of the floor covering in an electrically conductive way, in which the first particles comprise at least one granulated elastomer material and form a matrix, in which the second particles form electric conductive paths along the particle boundaries of the first particles.

Method of making an electrically conductive floor covering

A multicolored, patterned floor covering is disclosed along with a method for its manufacture. The floor covering is made of a sheeting which has a first color, and a granular material dyed differently from the sheeting which is embedded in the sheeting along at least in the area of the top side. The sheeting and the granular material consist of cross-linkable, elastomeric materials, the granular material comprising particles which have at least two subregions dyed differently from each other and from the sheeting. The quantity and color of the fractions of each component as selected so that the mixed color resulting from an homogeneous intermixing of all the components contained in the floor covering agrees with the first color.

Multicolored patterned floor covering and method for manufacture

A homogeneous floor covering composed of elastomer, varicolored granular particles contains 3 to 20 per cent by weight of a copolymer of ethylene, including at least one comonomer of vinyl esters of saturated carboxylic acids having up to 4 C-atoms in the acid group, or including at least one unsaturated mono- or dicarboxylic acid, or including at least one ester of unsaturated mono- or dicarboxylic acids having up to 8 C-atoms in the alcohol portion. In this context, the ethylene content of the copolymer is 40 to 95% per cent by weight, the rest is comonomer, and the melt-flow index of the copolymer must lie between 0.1 and 50. A corresponding manufacturing process is specified.

Process of making a homogeneous floor covering

A rubber moire floor covering is disclosed. The covering is produced by continuously feeding a screw-type short extruding machine having a length/diameter ratio of 6:1 with two or three varicolored strips of vulcanizable elastomeric material. The operating temperature is between 60.degree. C. to 100.degree. C. The elastomeric material leaves the extruder via a perforated disk having 200 to 600 cylindrical bore holes 3-5 mm in diameter. Each of the resulting strands is severed to produce segments that are 1 to 2 mm thick, the formed pieces are then cooled off on a section 4 meters to 6 meters long. Subsequently, the formed pieces are allowed to fall into the roll nip of a temperature controllable two-bowl calendar. The web of material leaving the calendar is fed to a continuous vulcanization installation and leaves it as finished floor covering. The material throughput rate in this continuous process may be varied from 700 kg/h up to 1300 kg/h.

Moire floor covering and method for its manufacture

The invention involves the use of about 1 to 4 %wt cured elastomer irregularly-shaped particles having a sieve size of about 0.7 mm +/-0.1 mm in uncured elastomer to suppress bubble formation without substantial loss of tensile strength, in calendered, cured elastomer products, such as, decorative or sealing sheet materials.

Method for suppressing bubbles in calendered elastomer

A method of manufacturing a floor covering presses a bottom layer of a polymeric material into apertures in a top layer having a higher pressure-flow viscosity than the bottom layer. The pressure also joins the layers into the floor covering and forms a continuous pressure-vulcanization skin on the top thereof for more uniform soiling and wear characteristics. Selecting the size and arrangement of the apertures in the top layer produces a corresponding pattern of the bottom-layer material in the top of the joined layers which is independent of any surface configuration also imparted in the pressing.

Multi-colored floor covering and method of manufacturing it

A process for producing a surface-embossed, deep-drawn article suitable for an interior finish or lining of a motor vehicle, for example, starts with a partially-crystalline polymeric material, i.e., one having crystallites, in film form. The film-form material is heated to a temperature below the melting point of its crystallites an surface embossed. The embossed material is then cooled and crosslinked. The crosslinking is preferably done by irradiating the cooled material with a high-energy beam such as an accelerated electron beam, for example. The cooled and crosslinked material is then reheated, this time to a temperature above the melting point of its crystallites, and deep drawn into the shape of the article.

Process for producing a deep-drawn article from a partially-crystalline

A method for the production of an embossed laminate containing at least two layers, in which a thin top layer of stretchable material is backed with an unvulcanized bottom layer of rubber and pressed with a platen which has recesses which are arranged in a pattern and have a depth exceeding the thickness of the top layer, in which the two layers are bonded and solidified together by vulcanization, and in which at least the top layer is removed in the area of the projections by a cutting, milling or grinding process performed on a straight line, the laminate being exposed to a pressure and deformation acting perpendicular to its surface during the removal of the top layer in the area of the projections.

Method for preparing an embossed laminate containing at least two layers

A method of making an electrically-conductive floor covering presses a polymeric bottom layer into apertures in a top layer having a higher flow viscosity than the bottom layer, the pressure also bonding the layers together. The bottom layer contains from about 3% to about 80% by weight carbon black or graphite for electrical conduction; the top layer contains not more than about 0.5% thereof. The apertures in the top layer are at least 1 mm in diameter and regularly or irregularly spaced from the next adjacent aperture from about 2 mm to about 40 mm, the area of the apertures not exceeding 40% per unit area of the top layer. The dark color of the bottom layer resulting from its carbon black or graphite content therefore need not significantly affect the appearance of the top layer, but provides electrical conductivity through the apertures.

Method of manufacturing light-colored electrically-conductive floor

Method for the manufacture of a relief profiled outer sole of cross-linked EVA polymer foamed with closed cells is described in which the polymer used is formed into a cross-linked, expanded tempered blank, split by at least one cut into several subblanks, and whereupon the surface of a subblank is heated and pressed to form the relief profile. The temperature gradient of the blank while it is being pressed is important for precise formation of the relief profile.

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Mannheim, Germany

Gerhard Graab