Patents Assigned to Showa Seitai Kogyo Kaisha Ltd.
  • Composite paper sheets adapted to manufacture bags and process
    Patent number: 4460426
    Abstract: At least one surface of a paper sheet of a composite paper sheet utilized to form bags is printed with a printing ink type binder. The binder is printed in the form of parallel spaced stripes extending in parallel with or crossing at a predetermined angle with respect to the longitudinal direction of the composite sheet. After printing, the composite sheet is wrapped into a roll. Then, the printed binder bonds adjacent paper sheets together to form the composite sheet. The binder can be applied with conventional printing press.
    Type: Grant
    Filed: May 29, 1981
    Date of Patent: July 17, 1984
    Assignee: Showa Seitai Kogyo Kaisha Ltd.
    Inventor: Akio Saito
  • Moisture proof bags provided with blow-in ports and method of manufacturing the same
    Patent number: 4132347
    Abstract: A bag adapted to be packed with cement or the like by blowing it into the bag through a foldable blow-in port comprises an outer layer of synthetic resin which is impervious to air and moisture and an inner layer of paper bonded to the outer layer by a layer of bonding agent. The surface of the layer of the bonding agent facing the paper layer is provided with a plurality of longitudinal grooves which act as exhaust passages for discharging the air blown into the bag.
    Type: Grant
    Filed: June 29, 1977
    Date of Patent: January 2, 1979
    Assignee: Showa Seitai Kogyo Kaisha Ltd.
    Inventor: Akio Saito