US 4,963,309 AGranted

Process and apparatus for processing elastomeric materials in particular plastic, rubber and a mixture thereof

AssigneePaul Troester Maschinenfabrik

InventorsHans-Joachim Gohlisch, Heinz Klein

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Abstract

The invention relates to a process and apparatus for processing elastomeric material in particular plastic, rubber and a mixture thereof in roller-head-apparatus in which the material to be processed is plasticized and homogenized in an extruder, extruded from an extrusion head provided on the extruder and then is led through an aperture formed between two rollers. It is the object of the present invention, with an especially simple extrusion head in a roller-head-apparatus to produce uniform and dimensionally exact sheets or foils of different thicknesses without changing structural parts. The invention achieves this in that material formed in plate form by parallel outlet surfaces of the extruder head is led through an aperture space formed between a concave cylindrical surface of a stationary forming tool and the circumferential surface of one of the rollers of the calender before the material enters the space between the two calender rollers.

Claims11

Dependent claims

Process of processing elastomeric material, in particular plastic, rubber or a mixture thereof to form a sheet of uniform thickness which comprises,

plasticizing and homogenizing said material in an extruder,
extruding said material through an extrusion head having an elongate extrusion aperture defined by straight, parallel outlet surfaces extending the full width of said aperture to form said material into a sheet of uniform thickness throughout its width;
directing said extruded sheet of material onto a circumferential surface of one roller of a calendar comprising two rollers rotating in opposite directions with a nip between said rollers,
passing said sheet of material through a curved passageway between the circumferential surface of said one rotating roller on which it is directed and a stationary elongate concave cylindrical surface facing and spaced by the thickness of said sheet from said circumferential surface of said one rotating roller, movement being thereby imparted to said sheet of material in said passageway on only one side thereof, namely the side facing said one rotating roller, to effect an alignment of macromolecules of said material, and
then passing said sheet of material through the nip between said rollers.

2 more elements

Apparatus for processing elastomeric material, in particular plastic, rubber or a mixture thereof to form a sheet of uniform thickness which comprises,

a calender comprising two rollers rotating in opposite directions with a nip between them,
an extruder comprising means for plasticizing and homogenizing said material and an extrusion head having an extrusion aperture defined by two straight parallel outlet surfaces extending the full width of said aperture for extrusion of said material in the form of a sheet having uniform thickness throughout its width,
said extruder being positioned to direct said sheet of extruded material onto a circumferential surface of one roller of said calender at a location circumferentially spaced from the nip between said rollers,
passageway defining means comprising a stationary elongate concave cylindrical surface facing and spaced from the circumferential surface of said one roller between the nip between said rollers and the location at which said sheet of extruded material is directed onto the circumferential surface of said one roller to define a curved passageway for said sheet of extruded material from said extrusion aperture to the nip between said rollers, in which passageway movement is imparted to said sheet of extruded material on only one side thereof, namely the side facing said one roller, to effect an alignment of macromolecules of said material.

1 more element

Dependencies are inferred from the claim text.