2 2 BARREL BLOCK FOR TWIN-SCREW EXTRUDER AND TWIN-SCREW EXTRUDER

摘要

Provided is a technology to eliminate the leakage of a raw material from corresponding barrel blocks by allowing a contact state of the periphery of a cylinder to be uniform while restricting the amount of falling of a bonding part when barrel blocks for a twin-screw extruder are bonded to each other. A barrel block (3p) for a twin-screw extruder constituting a barrel (3) having a cylinder (7) has a bonding part on both ends thereof. In a first bonding unit (26), a first inner bonding surface (26a) is formed at the periphery of a first opening (21a) of an insertion through-hole (21) of a screw (2), and a first relief surface (26c) and a first outer bonding surface (26e) are formed at an outer circumferential side of the first inner bonding surface (26a). The first outer bonding surface (26e) is formed on an outer circumferential side of a plurality of first bolt holes (24). The first outer bonding surface (26e) is formed to be more concave toward a second block end surface (20b) than the first inner bonding surface (26a).