Dynamit Nobel Aktiengesellschaft

Hermann Berstorff Maschinenbau Gmbh

Hans Brinkmann

Herbert Schulte

Uwe Sommermeyer

Horst Pabst

Bernhard Kraemer

Wilhelm Brand

Rolf Gersbeck

Heinz Brinkmann

Gottfried Eisele

Helmut Gormar

Helmut Putz

Hans Jurgen Schrick

Kurt Allner

A process for the production of thick synthetic resin sheets having a multicolor pattern, involves processing heated thermoplastic chips into a coherent sheet by means of a pair of rolls profiled to a depth of about 0.1-0.5 mm which effect partially differing densification.

Process for producing a synthetic resin sheet, especially for a

Process and apparatus for producing a sheet or film exhibiting a colored band of varying color intensity, with an extruder for melting a stream of a thermoplastic synthetic resin and with a slot die tool (e.g. a fishtail die) having a distributor duct with a throttle zone arranged upstream thereof, a back pressure plate or restrictor bar, and a nozzle orifice, wherein a colorless melt stream and a dyed melt stream are respectively shaped into a sheet having the desired width and are melted together prior to exiting from the die tool along a lateral edge to form one sheet; and wherein along a predetermined width, calculated from a transition line of the dyed sheet, a wedge-like extending color band made up of a partial stream of the dyed melt stream is introduced into the zone of the colorless sheet by way of a slot die having a wedge-like orifice and being arranged in the extrusion direction upstream of the back pressure plate and downstream of the distributor duct, with a corresponding displacement of the colorless melt stream.

Process and apparatus for producing a synthetic resin sheet having a

A slot die apparatus for the coextrusion of an endless sheet having a thickness of about 0.1-5 mm with an optionally dyed edge strip made from a narrower, optionally colored, melt stream of a width of about 100-500 mm and from a broader melt stream of a width of about 1,000-3,000 mm of a thermoplastic synthetic resin is provided by means of two parallel-operating extruders and associated melt pumps, with merging of the two melt streams. The apparatus is also provided by flanging together, by means of a flange, two dies at their end faces, these dies having identical cross sections and a corresponding width, comprising a spreader block, deckle, bottom lip, and top lip, and a flow channel made up from these components.

Process and apparatus for the production of sheeting having a color wedge

A process for the production of patterned tiles from thermoplastic synthetic resins includes the steps of forming a length of crude sheet stock by compressing unicolored and/or differently colored or multicolored particulate material of thermoplastic synthetic resin; cutting off crude sheets from the sheet stock; punching segments out of the crude sheets; combining the segments from at least two crude sheets of differing colors into a panel so that the segments complement one another, and thereafter press-molding the segments to form an intarsia tile with the use of pressure and heat so that the segments are welded together along joints formed therebetween.

Process for the production of patterned tiles from thermoplastic

A process for the continuous manufacture of sheeting from thermoplastic synthetic resins includes the steps of applying thermoplastic synthetic resin, in the form of particles, such as shreds, crumbs, cuttings, pieces, chips, or the like, continuously as a sheet-like layer of raw material to a moving support; passing the raw material layer through a heating zone to thereby preheat the material layer to a temperature approximately in the range from 100.degree. to 140.degree. C.; pressing the preheated material layer continuously over its full area during travel through a treatment zone so that, in a first phase, the raw material layer is compacted and welded under the effect of a pressure of from about 10 to 60 kp/cm.sup.2 and at the same time the material layer is heated to a temperature in the range from about 160.degree. to 220.degree. C; and, in a second, directly following phase, while maintaining said pressure, cooling the material layer and simultaneously pressing the layer to the thickness dimension predetermined by the amount of raw material layer applied to the moving support.

Process for the continuous manufacture of sheeting from thermoplastic

A process for extruding a film having small variations in thickness by regulating the quantities fed to a worm press and by regulating the extrusion process. Marginal strips and waste products of extruded film are re-processed by returning these materials, slicing them and directly weighing them before being fed to the filling bin of the screw press. In order to regulate the quantities fed to the screw press, the weighed material per unit of time is continually subtracted from a nominal value set by a volume regulator associated with the raw material seeder devices. The filling degree of the screw press is measured as the mass pressure between the screw press and a constant volume pump such that the filling degree is maintained constant during the extrusion process.

Growing community of inventors

Troisdorf, Germany

Hans Brinkmann