Stock material or miscellaneous articles – Hollow or container type article – Shrinkable or shrunk
Patent
1992-08-10
1993-10-12
Seidleck, James J.
Stock material or miscellaneous articles
Hollow or container type article
Shrinkable or shrunk
428359, 428 72, 525240, 242 685, B65H 8100
Patent
active
052523691
ABSTRACT:
A core that is adapted to receive web material such as a wound film roll includes inner and outer coaxial cylinders joined together by a ring plate that extends perpendicular to the longitudinal axes of the inner and outer cylinders. A plurality of radially disposed ribs are positioned between and connected to the inner and outer cylinders. Projection means is provided on the core at one of various places such as the inner surface of the outer cylinder or the outer surface of the inner cylinder. The projection means increases frictional resistance between the mold core and the molded core, thereby ensuring the mold core will be ejected with the core from the mold cavity. The core is manufactured from a resin composition comprising 70 to 30 wt. % of polypropylene resin having a melt index of 10 to 60 g/10 minutes, a bending elastic modulus of more than 8,000 kg/cm.sup.2, an Izod impact strength of more than 2 kg.cm/cm and a Rockwell hardness of more than 70 R, 30 to 70 wt. % of linear low density polyethylene resin having a melt index of 3 to 50 g/10 minutes, a density of 0.910 to 0.935 g/cm.sup. 3, an Olsen rigidity of more than 1,500 kg/cm.sup.2 and a Shore hardness of more than 40 D, more than 0.01 wt. % of a lubricant and more than 0.01 wt. % of an antioxidant.
REFERENCES:
patent: 4828106 (1989-05-01), Akao et al.
Akao Mutsuo
Inoue Koji
Critharis Mary
Fuji Photo Film Co. , Ltd.
Seidleck James J.
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