using screws surrounded by a cooperating barrel, e.g. single screw extruders

Introduced: January 2019

Full Title

Full titles differ between systems:

IPC:

Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor > Component parts, details or accessories; Auxiliary operations > Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die > using screws surrounded by a cooperating barrel, e.g. single screw extruders

CPC:

Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C49/04) > Component parts, details or accessories; Auxiliary operations > Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die > using screws surrounded by a cooperating barrel, e.g. single screw extruders

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 2019.

Child Classifications

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B29C 48/397 CPC only CPC only
B29C 48/40 using two or more parallel screws , e.g. twin screw extruders since 2019 +2 CPC IPC+CPC Available in IPC and CPC
B29C 48/445 Coaxially arranged screws, i.e. one within the other since 2019 IPC+CPC Available in IPC and CPC
B29C 48/45 Axially movable screws since 2019 IPC+CPC Available in IPC and CPC
B29C 48/455 Screws arranged to convey material towards each other, e.g. separate screws arranged after each other and feeding in opposite directions since 2019 IPC+CPC Available in IPC and CPC