摘要:
Das Patent beschreibt eine Düse für einen Extruder bestehend aus einem Kern (1) und einem mindestens zweigeteilten Gehäuse (2, 3), umfassend einen feststehenden Gehäusegrundkörper (2) und ein Endteil des Gehäuses (3), an dem die fließfähige Masse (12) die Düse verlässt, wobei das Gehäuse (2, 3) den Kern (1) so umschließt, dass zwischen Kern (1) und Gehäuse (2, 3) ein Fließkanal (4) vorhanden ist, durch den eine fließfähige Masse (12) ausgetragen werden kann, dadurch gekennzeichnet, dass der Fließkanal (4) im Bereich der Trennung zwischen dem Gehäusegrundkörper (2) und dem angrenzenden Endteil (3) mittels einer elastisch verformbaren Dichtung (5) abgedichtet wird, und das Endteil (3) auf dieser Dichtung (5) in beliebiger Richtung kippbar gelagert ist, sowie Verfahren zur gezielten Veränderung beziehungsweise zur Regelung der Dickenverteilung von fließfähigen Massen, wobei sowohl vorhandene exzentrische als auch unsymmetrische Dickenunterschiede unabhängig voneinander oder aber auch in verknüpfter Form ausgeregelt werden können.
摘要:
Process and die for manuf acturing a plastic hollow body Process for manufacturing a plastic hollow body by moulding a molten plastic parison, which is extruded vertically through a die, in a mould comprising two complementary cavities, characterized in that the die is adjusted so that the shape of the parison matches that of the mould cavities. Die suitable for such a process.
摘要:
Electrically operated actuator for modifying the thickness of the parisons during extrusion, by means of the usual means which modify the internal cross-section of the discharge mouths of the extrusion head and which are connected to a common cross-member (7) which may be guided by suitable means (107, 8) during the vertical movements, characterized in that the said cross-member is raised and lowered by means of mechanical systems which comprise at least connecting rods and cranks and which are actuated by a speed reducer (9) with limited play, which is fixed onto a support structure (102) positioned above the said cross-member (7) and moved by an electric motor (109) of suitable power, rotating in both directions and with electronic speed and phase control, for example a motor of the brushless type.
摘要:
Ein Extrusionskopf (4) zur Herstellung eines schlauch- oder rohrförmigen Kunststoffstranges ist mit dem Ausgang eines Extruders verbindbar und weist ein Düsenwerkzeug (42) auf, welches einen Kern (43) und einen Düsenring (44) umfasst. Der Kern (43) und der Düsenring (44) begrenzen einen Öffnungsspalt (45), dessen Öffnungsweite durch eine über einen elektrischen oder hydraulischen Stelltrieb (23) steuerbare axiale Relativbewegung (A, B) zwischen dem Kern (43) und dem Düsenring (44) veränderbar ist. Die Extrusionskopf (4) umfasst ein Aufhängeteil (20) und ein lösbar damit verbundenes Extrusionsteil (40) auf, das sämtliche Anschlüsse und Fliesskanäle für die zu extrudierende Masse aufweist und mit dem Düsenwerkzeug (42) ausgestattet ist. Der Stelltrieb (23) ist am Aufhängeteil (20) angeordnet und lösbar mit dem Dorn (43) oder dem Düsenring (44) verbindbar.
摘要:
Processes and apparatus for extruding a tubular film of polymer material. The apparatus comprises a circular coextrusion die having an inlet (10) for the or each component and having an exit channel (18) ending in a circular exit orifice (21) which is located radially outwardly from the die axis compared to the inlet (10). The die comprises several planar or conical die parts (5, 6, 7, 28, 29) clamped together, with surfaces supplied with grooves (14) shaped to form channels (11, 12, 13) for the flow polymer material. The shape of the channels is adapted to equalize the flow over the circumference of the exit orifice (21), and the flow of material is divided between the inlet (10) and the exit (21) into a number of part flows (13) of generally helical form with space (15) provided for overflow of material between said part flows, whereby the part are adapted so that they join to one common, circular flow.
摘要:
A process for making a plastic tube having a variable diameter comprises the following steps. A plastic is obtained. The plastic is fed into an extruder die (216). The plastic is extruded as a tubular molten plastic stream (262) into a mold cavity (218) having an inside diameter greater than the diameter of the tubular molten plastic stream (262). The mold cavity (218) inside diameter varies longitudinally along the length of the mold cavity (218). The tubular molten plastic stream (262) is vacuum expanded radially against the mold cavity inner wall (290). The wall thickness of the tubular molten plastic stream (262) is varied during extrusion at locations longitudinally along the stream (262).
摘要:
The invention relates to a method and apparatus for blow moulding. In the blow moulding apparatus, an extruder (1) feeds material into a connecting channel (9) to form an annular parison. The annular parison is fed into a mould and air is blown into the parison. In the connecting channel (9) there is a regulating cavity (10) with a variable volume, the volume being regulated by moving a regulating piston (11) of the apparatus back and forth. When increasing the volume of the regulating cavity (10), more material is left in said regulating cavity (10), the exit flow decreases and thus the wall of an article becomes slightly thinner. When contracting the regulating cavity (10), more material is extruded from the apparatus, and the wall of the article to be manufactured becomes thicker.
摘要:
The present invention relates to an apparatus for producing pipes of a mouldable material, preferably plastic, comprising an extruder, a cylindrical mould comprising chill moulds (4, 5), a mandrel (8) inside the extruder and a kernel (9) as an extension of the mandrel. The mandrel is attached at its front end to the extruder. The mandrel (8) and the kernel (9) can be kept concentric with the extruder and the mould if the mandrel and the kernel are joined to each other in such a manner that the angle between their centre lines is adjustable.
摘要:
An extrusion head for making tubular articles comprises an abutment element (2) and a male element (3) associated to the abutment element (2) in correspondence to an outlet opening to define a passage section for an extrusion material; the extrusion head further comprises means for adjusting (4) the position and/or relative orientation between the male element (3) and the abutment element (2) in order to vary the relative juxtaposition conditions at least with respect to an extrusion axis (A) and the adjustment means (4) comprise mating surfaces with complementary concavity and respectively associated with the abutment element and the male element: these mating surfaces with complementary concavity are in mutual proximity condition and/or contact.