Patents Assigned to 236913 Alberta Ltd.
  • Patent number: 4442740
    Abstract: A method and device are described for producing slitted plastic film sheets of the type used for wrapping lettuce and similar produce. A form of punch press is used with an upper ram and lower platen and a tray moves in and out horizontally between the ram and platen. On the tray is a die with slitter blades over which is placed a stack of plastic film sheets. The tray moves in and the ram presses down on the sheets, cutting slits through the stack. Then the tray moves out and the stack of slitted sheets is removed. A single operator can produce 450 slitted sheets per minute with this system.
    Type: Grant
    Filed: September 23, 1982
    Date of Patent: April 17, 1984
    Assignee: 236913 Alberta Ltd.
    Inventor: Thomas R. Rayton