Plastic fans having improved fan ring weld line strength

Details Plastic fans having improved fan ring weld line strength Plastic fans having improved fan ring weld line strength

2007-01-30

2007-01-30

Edgar, Richard A. (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Having clutch or brake means

C416S195000, C416S234000, C415S915000

Reexamination Certificate

active

10831789

ABSTRACT:
A method to influence material flow during the injection molding of thermoplastic, polymeric ring type fans such that a major portion of the materials flowing in opposite directions preferably flow past one another, or collide at an angle relative to one another, rather than colliding at an 180 degree angle relative to each other to form weld lines. This flow bypassing results in better material mixing or integrating than merely allowing flow fronts to collide and cool. In one embodiment, a portion of the fan's ring is thickened in the weld line area to minimize the amount of material colliding at a 180-degree angle relative to each. Alternatively, at least one appendage could be added to the ring fan that will influence the material flow during molding conditions. Each appendage will be removed prior to introducing the ring fan to a cooling system.

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