Transition Channel For Use Between A First Conduit And A Second Conduit In A Molding System
Disclosed herein is a transition channel for conveying fluid between a first conduit and a second conduit in a molding system. For example, there is disclosed a transition channel for providing a flow path between a first conduit having a first cross-section and a second conduit having a second cross-section in a molding system, the transition channel configured to have a shape that follows a curve that substantially corresponds to melt natural stream lines.
1 . A transition channel for providing a flow path between a first conduit having a first cross-section and a second conduit having a second cross-section in a molding system, the transition channel comprising:
an inner surface having a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines.
2 . The transition channel of claim 1 , wherein said curve is continuous and devoid of sharp directional changes.
3 . The transition channel of claim 1 , the first conduit comprising an entry portion of a barrel head and the second conduit comprising an exit portion of the barrel head, wherein said transition channel comprises a transition portion located between the entry portion and the exit portion of the barrel head.
4 . The transition channel of claim 3 , wherein said curve is substantially hyperboloidal.
5 . The transition channel of claim 3 , wherein said curve is substantially paraboloidal.
6 . The transition channel of claim 3 , wherein said curve is based on an approximation profile.
7 . The transition channel of claim 6 , wherein said approximation profile comprises two tangent radii.
8 . The transition channel of claim 1 , the first conduit comprising a first channel portion of a nozzle channel of a hot runner nozzle and the second conduit comprising a second channel portion of the nozzle channel, wherein said transition channel comprises a transition portion located between the first channel portion and the second channel portion of the nozzle channel.
9 . The transition channel of claim 8 , wherein said curve is substantially hyperboloidal.
10 . The transition channel of claim 8 , wherein said curve is substantially paraboloidal.
11 . The transition channel of claim 8 , wherein said curve is based on an approximation profile.
12 . The transition channel of claim 11 , wherein said approximation profile comprises two tangent radii.
13 . A barrel head for an injection molding machine, the barrel head for providing a path of flow for melt between a barrel portion having a first channel having a first cross-section and a machine nozzle having a second channel having a second cross-section, the barrel head comprising:
an internal channel defining:
an entry portion having a cross-section substantially corresponding to the first cross-section;
an exit portion having a cross-section substantially corresponding to the second cross-section;
a transition portion having a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines.
14 . The barrel head of claim 13 , wherein said curve us substantially hyperboloidal.
15 . The barrel head of claim 13 , wherein said curve is substantially paraboloidal.
16 . The barrel head of claim 13 , wherein said curve is based on an approximation profile.
17 . The barrel head of claim 13 , wherein said approximation profile comprises two tangent radii.
18 . The barrel head of claim 13 , wherein said curve is continuous and devoid of sharp directional changes.
19 . A nozzle channel for a hot runner nozzle of a molding system, the nozzle channel comprising:
a first channel portion having a first cross-section;
a second channel portion having a second cross-section;
a transition portion located between the first channel portion and the second channel portion, the transition portion having a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines.
20 . The nozzle channel of claim 19 , wherein said curve us substantially hyperboloidal.
21 . The nozzle channel of claim 19 , wherein said curve is substantially paraboloidal.
22 . The nozzle channel of claim 19 , wherein said curve is based on an approximation profile.
23 . The nozzle channel of claim 19 , wherein said approximation profile comprises two tangent radii.
24 . The nozzle channel of claim 19 , wherein said curve is continuous and devoid of sharp directional changes.
25 . In an injection molding machine, a transition channel comprising:
means for joining a first conduit and a second conduit of differing cross-sectional areas, said means for joining configured to provide a flow path for the melt that is continuous and devoid of sharp directional changes.
26 . The transition channel of claim 25 , wherein said means for joining have a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines
27 . A hot runner valve stem for an injection molding machine, said hot runner valve stem comprising:
a tip defining an external surface, said external surface having a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines.
28 . The hot runner valve stem of claim 27 , wherein said curve comprises one of a substantially hyperboloidal curve, a substantially paraboloidal curve and a curve based on an approximation profile.
29 . A tip of a check valve of a plasticizing screw, said check valve tip comprising:
an external surface, said external surface having a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines
30 . The tip of claim 29 , wherein said curve comprises one of a substantially hyperboloidal curve, a substantially paraboloidal curve and a curve based on an approximation profile.
31 . A hot runner nozzle for an injection molding machine, the hot runner nozzle comprising:
a nozzle channel defined in said hot runner nozzle,
a valve stem extending along said nozzle channel;
said valve stem comprising an external surface and said nozzle channel comprising an inner surface, wherein at least one of said external surface and said inner surface has a shape that is configured to follow a curve that substantially corresponds to melt natural stream lines.