Patents Assigned to Asko-Uop Oy
  • Method of heating an end of a length of plastic pipe and a circulating air furnace for carrying out the method
    Patent number: 4352659
    Abstract: A method and a circulating-air furnace for heating one end of a length of plastic pipe for the purpose of belling the end of the pipe. The circulating air is made to flow through a fan and a heater and thereinafter along the outer and inner faces of the pipe end. In order to improve the adjustability of the heating of the pipe end, the circulating air is blown as an annular shaped flow in the direction of the center axis of the pipe end towards the pipe end so that the air flow is divided onto the inner and outer faces of the pipe.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: October 5, 1982
    Assignee: Asko-Uop Oy
    Inventors: Erkki Salmela, Vaino Kulo