| 摘要 |
<p>Extrusion apparatus (300) comprises: a die assembly (304) including a die (352) having an orifice (362) of a desired shape and a ram (310) for forcing a portion of material to be extruded through the die orifice (362) to form an extrusion, said ram (310) being movable relative to the die (352) to a retracted position to allow a further portion of material to be extruded to be placed in said die assembly (304). Means (346) is provided for retaining on the ram (310) part of the material to be extruded, whereby the extrusion can be at least partially retracted when the ram (310) moves to the retracted position. This enables the further portion of material to be located in the die assembly (304) with the extrusion extending through a bore provided in said further portion of material.</p> |
