Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1984-12-11
1987-08-11
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264108, 264310, 264312, 425376B, 425381, 425466, 425467, B29C 4724
Patent
active
046860754
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of manufacturing extruded pipes where plasticized material. for example plastic material, is advanced to an extrusion nozzle comprising a circular gap. The invention also relates to an apparatus for carrying out the method.
Using known methods the material is transported through an extrusion nozzle substantially only in parallel with the longitudinal direction of the extruded pipe, whereby the molecules of the material are oriented in said longitudinal direction. The orientation thus obtained brings about a certain reinforcement effect in said longitudinal direction, but not, for example, in the circumferential direction of the pipe.
The present invention relates to a method and an apparatus, in which orientation occurs in several directions and thereby bring about reinforcement in several directions. It is hereby possible to reduce the necessary wall thickness for definite strength properties and thereby to reduce the amount of plastic or the like.
The invention, thus, relates to a method of manufacturing extruded pipes, where plasticized material, for example plastic material, is advanced to an extrusion nozzle comprising a circular gap.
The method is especially characterized in that the material is transported axially in said gap while material is caused to move, such as to rotate, in the circumferential direction of the gap, so that the material at least partially is caused to assume an orientation deviating from the axial direction, whereby non-axial orientation will prevail in the extruded pipe and increase the strength.
The invention also relates to an apparatus for manufacturing extruded pipes, comprising devices for advancing plasticized material, for example plastic material, to an extrusion nozzle comprised in the apparatus, which nozzle comprises a circular gap, through which material is intended to pass in axial direction.
The apparatus is especially characterized in that it comprises devices for moving, for example rotating, material substantially in the circumferential direction of the gap, so that the material at least partially is caused to assume an orientation deviating from the axial direction, whereby non-axial orientation will prevail in the extruded pipe and increase the strength.
The invention is described in greater detail in the following, with reference to embodiments thereof and to the accompanying drawings, in which
FIG. 1 is a schematically shown central section in parallel with the longitudinal direction of the extrusion nozzle at a first embodiment of an apparatus according to the invention,
FIG. 2 shows a slitted tubular body intended to be placed rotatably in the circular gap of the extrusion nozzle,
FIG. 3 is a view from the right in FIG. 2 of the body according to FIG. 2,
FIG. 4 shows schematically an extruded pipe according to the invention adjacent the outer end of the nozzle according to FIG. 1,
FIG. 5 shows schematically a portion of a second embodiment of the extrusion nozzle at an apparatus according to the invention, seen from the outer end of the nozzle,
FIG. 6 is a vertical central section through a portion of the nozzle according to FIG. 5,
FIG. 7 shows schematically a portion of a third embodiment of the nozzle at an apparatus according to the invention, seen as in FIG. 5,
FIG. 8 is a vertical central section through a portion of the nozzle according to FIG. 7, and
FIG. 9 is a perspective view of a portion of a pipe manufactured by the apparatus according to FIGS. 5 and 6.
In FIG. 1 the numeral 1 designates a feed passageway for the supply of plasticized material, for example so-called HD-polyethene or PVC, to the extrusion nozzle. Also other material, such as rubber, can be extruded. The nozzle comprises a circular gap 2, through which material is intended to pass in axial direction, and where a pipe 3, FIG. 4, formed of the material is intended to run out through the gap 2 at the outer end 4 of the nozzle. At said outer nozzle end 4 a forming space 2' is located, which in the embodiment according to FIG. 1 constitutes a por
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Dziewanowski Andre
Piotrowski Krzysztof
Zaremba Krzysztof
Mats Lundberg
Thurlow Jeffery
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