07-01-2016 дата публикации
Номер: US20160001484A1
Принадлежит:
A device produces plastic pipes by extrusion, involving an extruder, a pipe head connecting to the extruder in production direction, having a base material, mandrel, and sheath. A melt channel, formed between the mandrel and sheath in production direction, promotes flow at least at the mandrel and sheath end, the mandrel and sheath being adjustable forwards and backwards relative to one another, and the outer mandrel surface and/or the inner sheath surface at least partially having a material with greater sliding capacity than the base material. Mandrel diameter at the end conically widens or narrows, and/or the mandrel end is curved so the diameter widens, narrows, or remains constant, and the inner sheath diameter at the end conically widens, narrows, or remains constant, and/or the sheath end is curved so the diameter widens or narrows, or two further surface sections, parallel and cylindrical, extend at the mandrel and sheath end. 1. An apparatus for producing a plastic tube by extrusion with an extruder , the apparatus comprising:a pipehead, attached to the extruder in a production direction, comprising a base material, a mandrel, and a sleeve; anda melt channel, created between the mandrel and the sleeve, the melt channel being shaped to aid flow in the production direction at least at a mandrel end and at a sleeve end,wherein the mandrel and the sleeve are adjustable backwards and forward relatively to one another,wherein an outer mandrel surface and/or an inner sleeve surface at least partially comprises a material that allows for a higher sliding quality than the base material,wherein a mandrel diameter conically increases or decreases at the mandrel end and/or the mandrel end is rounded or implemented with a mandrel end radius, leading to an increase or decrease or a tapering of the mandrel diameter,andwherein an inner sleeve diameter conically increases or decreases or is tapered at the sleeve end and/or the sleeve end is rounded or implemented with a ...
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