B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/509
B29C 49/28 (2006.01)
Patent
CA 2038288
ABSTRACT OF THE DISCLOSURE A blow head for blow molding thermoplastic products includes a casing and a concentric assembly of mandrels aligned with a predetermined flow axis. The mandrels and casing cooperate to define distinct concentric flow channels. A former shapes molten thermoplastic materials discharged from the flow channels into a single tube with a selected cross-sectional thickness. Spiral grooves are formed in external surfaces of the mandrels to distribute material more evenly around an associated flow channel. Each mandrel has a circumferential chamber for receiving thermoplastic material under pressure and supplying the material to upstream ends of the flow channel and grooves associated with the mandrel. Material inlets inject the materials under pressureinto each chamber in a direction transverse to the axis. The inlets are constituted by passage sections formed in the casing and the mandrels that align simultaneously to constitute the inlets. A heart-shaped flow divider in each chamber immediately confronts and divides the flow from the associated inlet into substantially equal flows in circumferentially opposing directions around the chamber. Thermoplastic materials are distributed more evenly in the flow channels so that the tube and final product formed from the tube have greater uniformity.
Borden Ladner Gervais Llp
Ruetalo Alberto F.
LandOfFree
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