Core for web material

Details Core for web material Core for web material

1988-11-07

1991-02-05

Hail, III, Joseph J.

Winding, tensioning, or guiding

Coil holder or support

Spool or core

B65H 7518

Patent

active

049898027

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. At least one projection 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 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: 2881894 (1959-04-01), Regentrop et al.
patent: 4147291 (1979-04-01), Akao et al.
patent: 4162047 (1979-07-01), Hashimoto
patent: 4258848 (1981-03-01), Akao et al.
patent: 4331725 (1982-05-01), Akao
patent: 4337285 (1982-06-01), Akao et al.
patent: 4356224 (1982-10-01), Akao et al.
patent: 4359499 (1982-11-01), Akao et al.
patent: 4386124 (1983-05-01), Akao
patent: 4411943 (1983-10-01), Akao
patent: 4411945 (1983-10-01), Akao et al.
patent: 4436809 (1984-03-01), Akao et al.
patent: 4452846 (1984-06-01), Akao
patent: 4469741 (1984-09-01), Akao
patent: 4513050 (1985-04-01), Akao
patent: 4564156 (1986-01-01), Cybulski
patent: 4565733 (1986-01-01), Akao
patent: 4565743 (1986-01-01), Akao
patent: 4576865 (1986-03-01), Akao
patent: 4579781 (1986-04-01), Akao
patent: 4584234 (1986-04-01), Hirose et al.
patent: 4587175 (1986-05-01), Akao
patent: 4606511 (1986-08-01), Machida
patent: 4629640 (1986-12-01), Akao
patent: 4639386 (1987-01-01), Akao
patent: 4653640 (1987-03-01), Akao
patent: 4661395 (1987-04-01), Akao
patent: 4661401 (1987-04-01), Akao
patent: 4663218 (1987-05-01), Akao
patent: 4664328 (1987-05-01), Yamada
patent: 4687692 (1987-08-01), Akao
patent: 4708896 (1987-11-01), Akao
patent: 4715558 (1987-12-01), Fair et al.
patent: 4730778 (1988-03-01), Akao et al.
patent: 4778712 (1988-10-01), Akao
patent: 4778713 (1988-10-01), Akao
patent: 4784906 (1988-11-01), Akao
patent: 4787506 (1988-11-01), Akao
patent: 4796823 (1989-01-01), Akao et al.

Affiliated with

Also associated with

Rating

Core for web material does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Core for web material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Core for web material will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4837