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【What is the die in which low pressure molding can be possible?】
・Fluidity of resin increases by venting gas from just under a sprue and from runner-end part, filling of resin with low pressure becomes easy.
・Clogging of air vent in product part can be prevented by venting gas before resin is passed through the gate.
・If the necessary vent volume which the air in die can be exhausted for a long time with low pressure is made, the molding with fixing the molding condition will be continued.
【The measures which most companies take to make as gas vent】
① The diameter of Ejector pin in sprue part is made small, and the gas is exhausted from the outside periphery of the pin. Otherwise, the gas venting is made by chipping off the edge in the outside periphery of the pin.
② The vent processing is performed to the surface which has the width similar as the width of runner in the edge of runner-end.
It is being confirmed that we have a little effect with ① or ②, but the exhaust ability of each vent is too small.
The gas adheres to the outside periphery if vent is made to the outside periphery of Ejector pin. Therefore we have to be afraid to the risk from which smooth operation of Ejector pin may be obstructed.
【The following effects will be obtained with low pressure molding】
① Burrs become small.
② Short shot can be prevented.
③ The warp and deforming become small.
④ Gas burning can be prevented.
⑤ The range of molding condition can be widened.
⑥ Temporary stop can be prevented.
⑦ The molding with the molding machine ranked into the low clamping force ability is possible.
⑧ The transcription rate is also improved.
【With doing low pressure molding..】
The problem in quality is decreased with the above effects, and productivity will be improved drastically because the resin-cost and the electricity-cost are reduced.
Additionally, change in production plan becomes unnecessary, so on-time delivery rate is also improved
Company name | Plamoul Seiko Co.,Ltd. | EMIDAS Member Number | 74952 |
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Country | Japan | Street address |
Tomiya City Miyagi Japan |
Telephone number | +81-22-348-1250 | Fax number | +81-22-348-1244 |
Employees | 70,000,000 JPY | Annual sales | 320,000,000 JPY |
Employees | 42 | Person in charge | Fumitomo Kikuchi |
Type of manufacturing | Jigs and tools / Electronic parts |