| 摘要 |
An insert, for a fibre extrusion die head, intended to distribute plastics material in the length direction of the die head by paths of equal length, comprises at least two plates in abutting relationship defining channels at the abutting faces one plate having a duct extending from the middle region of each channel back through the thickness of the plate and the other plate having a duct adjacent each end of each channel extending through the thickness of that plate. In a preferred embodiment the insert presents a cylindrical configuration and comprises three plates 11, 12, 13 in stacked relationship with channels 14 and 28-31 in the external surfaces of the first and third plates and channels 16, 19, 21 defined by the mating faces of the plates with ducts 15, 18, 20, 24-27 through the plates connecting the channels to form a "family tree" duct and channel distribution and whereby, from a single material supply inlet defined by the die head, the channels and ducts distribute the material uniformly to sixteen outlets defined by the die head via paths of equal length. <IMAGE>
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