Roehm Gmbh Chemische Fabrik

Rohm Gmbh Chemische Fabrik

Roehm Gmbh & Co Kg

Karl Funk

Heinz Gross

Erhard Haun

Horst Greb

Hans Lorenz

Andreas Beringer

A process and device for the stable width wise regulation of the bulb angle in connection with the extrusion of sheets of heat-sensitive plastic ( ) in an extrusion device with a calendar opening formed by two intake rollers ( ) and a traversing measuring device ( ) provided according to the calendar slot by altering positioning elements on the extrusion device. At least two traversing measurements of a parameter correlating with the bulb angle are started consecutively on the heat-sensitive plastic sheet synchronously with the positioning of one of the two calendar rollers. Like measurement conditions therefore exist and the deviation of the measured values obtained on the basis of the measurements in relation to specified expected values is used to regulate the bulb angle over its width by altering a setting element on the extrusion device.

Process for stable widthwise regulation of bulb angle in extrusion of sheets of heat-sensitive plastics through a calender opening formed by intake rollers

A process and device for the stable widthwise regulation of the bulb angle in connection with the extrusion of sheets of heat-sensitive plastic (2) in an extrusion device with a calender opening formed by two intake rollers (3, 2) and a traversing measuring device (7) provided according to the calender slot by altering positioning elements on the extrusion device. At least two traversing measurements of a parameter correlating with the bulb angle are started consecutively on the heat-sensitive plastic sheet synchronously with the positioning of one of the two calender rollers. Like measurement conditions therefore exist and the deviation of the measured values obtained on the basis of the measurements in relation to specified expected values is used to regulate the bulb angle over its width by altering a setting element on the extrusion device.

Device for stable widthwise regulation of bulb angle in extrusion of

In the extrusion of thermoplastic deformable plastics, especially the manufacture of plastic plates, an automatic regulation apparatus on the roller discharge ensures that the extruded plastic plate is directed horizontally along the device center after leaving the roller calender. The apparatus contains a sensor unit which transmits a position signal for the horizontal position of the plastic plate to a controller which, when a deviation of the plastic plate center from the device center occurs, activates two pneumatic plug cylinders such that the plug force of the haul-off rolls changes the roller diameter and thereby guide the conveyed direction of the plastic plate.

Extrusion device having position control

Extruded, smooth finished solid sheet or film, which may have a thickness&lt;1 mm, of a thermoplastic plastic (such as polycarbonate) with a glass transition temperature &gt;50.degree. C., which under conditions of orientation displays optical birefringence, may be manufactured into a flat strip with smooth finished surfaces, to yield a strip which has characteristics as follows:

Producing extruded solid plastic sheet and film

A flat web of sizable thickness made of thermoplastic can be extruded from an extrusion die without a restrictor bar if a thickness D of a restricting passage is made smaller than a shaping distance A of die lips (4, 5), and if at least one wall of the restricting passage (6) is adjustably designed as an elastic lip (7) by adjusting elements (8), so that thickness D and distance A can be changed at the same time by actuating the adjusting elements.

Extrusion die for thermoplastic webs

Extruded, smooth finished solid sheet or film, which may have a thickness &lt;1 mm, comprised of a thermoplastic plastic (such as polycarbonate) with a glass transition temperature &gt;50.degree. C., which under conditions of orientation displays optical birefringence, may be manufactured into a flat strip with smooth finished surfaces, to yield a strip which has characteristics as follows:

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Griesheim, Germany

Karl Funk