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Hot press

  • US 5,182,121 A
  • Filed: 10/09/1990
  • Issued: 01/26/1993
  • Est. Priority Date: 10/11/1989
  • Status: Expired due to Fees
First Claim
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1. A hot press for mutually aligning materials of a multi-layer substrate of printed circuit boards and adhesive resin and interposing the materials into the heating plates and effecting heating and pressurization to form the multi-layer substrate, the hot press comprising:

  • a base frame;

    a lower bolster movable up and down by a ram of a hydraulic cylinder supported by said base frame;

    a column fixed to said base frame for guiding the up and down movement of the lower bolster;

    an upper bolster fixed to an upper end portion of said column and confronting said lower bolster;

    upper and lower heating plates respectively fixed through insulative plates to said upper and lower bolsters;

    an intermediate heating plate located between said upper and lower heating plates and supported by said upper bolster;

    heating means for supplying a thermal medium to said intermediate heating plate, said upper heating plate and said lower heating plate and collecting the thermal medium from the heating plate;

    hydraulic pressure means for supplying pressurized oil to said hydraulic cylinder;

    a sleeve movable up and down along a side surface of said upper bolster by moving means, said sleeve being adapted to surround said materials for the multi-layer substrate with a lower end portion of said sleeve being in contact with an upper surface of said lower bolster;

    first sealing means for sealing an interior of said sleeve when said sleeve is in contact with the upper surface of said lower bolster;

    second sealing means for sealing an interior of said sleeve;

    discharging means for discharging atmosphere contained in said sleeve maintained under a sealed condition by said first and second sealing means;

    means for supplying a gas maintained at a predetermined pressure into said sleeve; and

    a hydraulic means including a pilot check mechanism for preventing said lower bolster from being raised due to a differential pressure between the upper surface and lower surface of said lower bolster when the interior of said sleeve is maintained at one of a vacuum pressure condition and a high pressure condition due to the predetermined gas pressure.

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