B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/74 (2006.01) B29C 45/27 (2006.01)
Patent
CA 2281732
Plugs (20) that can be removed and that are made in two parts are used to close off channel sections in a hot runner manifold (10); these are arranged so as to subtend an acute angle .alpha. with the principal axis (A) of a runner or channel (15) that can be charged with a plastified mass. A continuous sealing edge of the front surface (30) of these is pressed onto a continuous annular surface (40) that encloses an opening (42) to the channel (15). The angle .alpha. lies between 40° to 45°. The plug (20) incorporates a pressure piece (26) that is located in front of a screw body (22) that can be screwed into an inclined bore (15) that opens out into area of the channel in the manifold (10) that is to be sealed off. At the sealing edge (31), the front surface (30) of the plug is flat, although it can be concavely curved inward or be crowned (32), much like a segment of a sphere, the diameter of which is defined by the diameter of the smallest radius of the sealing edge (31). The outer annular surface (40), which is circularly restricted, can be arranged on an elbow (38) at which the channel (15) makes the transition to become a branch of the manifold (10). In a through channel (15) with a series of branches (34) selected sections (36)--the ends of which have annular surface (40) that are inclined opposite to each other-- can be closed off by the associated plugs (20).
Fetherstonhaugh & Co.
Gunther Heisskanaltechnik Gmbh
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