| 摘要 |
PURPOSE:To obtain said foamed object of uniform foaming and perfect fusion bonding, by installing the detecting device of the foaming pressure of resin in a mold, connecting electrically said detecting device and a steam controller installed at the pipe end of a steam supply pipe and controlling supply of steam by the pressure of foaming resin. CONSTITUTION:Foamable polystyrene etc. is filled in a molding chamber 13 by a filling tool 18, then, steam is supplied into the steam chambers 2, 8 of both male and female molds 7, 1 by opening steam controllers 14, 15, drain valves 16, 17 to heat the both molds 1, 7. Steam supply to the male mold 7 is stopped when the mold temperature attains ca. 90 deg.C, and steam is supplied only to the female mold 1 and heats resin 13 via the steam ejecting hole 6. The steam ejecting hole 6 is gradually blocked as resin foamed, steam is supplied to the male mold 7 at the predetermined pressure and heats resin 13 via steam ejecting holes 12. The pressure detecting device 20 senses the pressure when resin is sufficiently foamed and fusion-bonded, then, the passage of the steam supply pipes 3, 9 is shut by the electrical signal and steam supply is stopped. |
