Fan gates of Plastic Injection Molding are modified of edge gates, just out at an angle from the runner system to the plastic injected parts where in the edge gate. The width of chisel-type gate is from 6mm to 1/4 width of the plastic injected parts and shallow is from 0.25mm to 1mm.
Fig 1 shows fan gate design. Fan gates provide reduced pressures and clamp tonnage over other conventional gate designs and are excellent for plastic injection molding. Flat the plastic injected parts such as automotive trim objects and electronics covers and enclosures. Fan gates allow for a wide process window and reduce overpacking issues since the pressure is lower than in pinpoint gates and submarine gates. The disadvantages are that the gates must be trimmed by special fixture and there is an obvious gate vestige and increased scrap due to the difficulty of trimming off fan gates.
Fig 1 Fan gate design
Fig 2 are cross section of fan gate. To reduce the vestige and alleviate the trim issue, a chisel cross section can be used for the fan gate. This chisel type allows the waste to break off from the plastic injected parts cleanly and evenly as show in Fig 3. The fan gate thickness of the export and import are calculated as follows:
Fig 3 Chisel cross section of fan gate
Fig 3 Chisel cross section of fan gate
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