EXTRUDER FOR PLASTICIZING PLASTIC

摘要

An extruder has a housing extending along an axis and formed with a downstream bore portion centered on the axis and upstream from this portion with a radially open recess having flat axially extending sides. An insert of generally square section is snugly receivable in this recess with its sides flatly engaging the sides of the recess. This insert is formed with a throughgoing passage forming an upstream bore portion and with a radially extending inlet open into this passage. The insert may be formed with axially extending and radially inwardly open grooves. This insert has at its ends centering formations and is releasably clamped within the housing so that a worm can extend axially through both of the bore portions which are coaxial when the insert is clamped in place. The insert is formed with a network of internal passages through which a coolant may be circulated.