Screw cap of thermoplastics material

Details Screw cap of thermoplastics material Screw cap of thermoplastics material

B - Operations, Transporting

65

D

206/21

B65D 41/04 (2006.01) B29C 45/14 (2006.01) B65D 41/34 (2006.01) B65D 51/24 (2006.01) B29C 43/18 (2006.01)

Patent

CA 1319648

ABSTRACT A screw cap of Thermoplastics Material A screw cap of thermoplastic material, particularly intended for the closure of glass containers used in the food industry, is provided on the outer surface of its horizontal end wall with a thin covering layer of a composite laminated material which is adapted to form a barrier against the passage of gases through the wall. This composite, laminated material is constituted by a disc incorporated in the outer face of the horizontal end wall of the cap during the injection moulding of the cap. The disc is permanently bonded to the horizontal end wall of the cap and to a downwardly-curved wall connecting the peripheral edge of the horizontal end wall to a rounded annular shoulder provided at the top of the cylindrical skirt of the cap. The cap is made by a method in which the disc is inserted into the cavity of the matrix of an injection mould and is held in place by frictional engagement of its peripheral edge with the ribs of said matrix which are intended to form vertical grooves in the cylindrical skirt of the cap.

595368

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