To provide an injection molding system simplifying setting of a time to open a shut-off valve to improve productivity without excessively supplying an injection molding machine with a molding material.
The injection molding system includes a molding material supply device 13, a vacuum deaerator 14 and the injection molding machine 15. A first hopper 1 and a second hopper 2 of the molding material supply device 13 are provided with a vacuum gage 16 and a vacuum gage 17. A vacuum comparing device 18 is also provided for comparing the degrees of vacuum measured by the vacuum gages 16, 17. The vacuum comparing device 18 compares a difference between the respective degrees of vacuum, and opens the shut-off valve 3 when the vacuum degree difference is not more than a predetermined value (a value not applying an impact to at least the second hopper 2 when the shut-off valve 3 is opened by the pressure difference).
| JP2006035847A | 2006-02-09 | |||
| JP2006035489A | 2006-02-09 | |||
| JPS5997006U | 1984-06-30 | |||
| JP2006347051A | 2006-12-28 | |||
| JPH09155867A | 1997-06-17 | |||
| JP2008290250A | 2008-12-04 |
Ishibashi Masayuki
Masaaki Ogata