Equipment for eraser manufacture

Details Equipment for eraser manufacture Equipment for eraser manufacture

1989-10-06

1992-06-02

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Female mold type means

249 93, 249167, 425125, 425817R, B26C 3500, B26C 4514

Patent

active

051182726

ABSTRACT:
Equipment includes a cavity former and a hot and cold water tank. The cavity former holds fiberglass strips part of which are inside the cavity and part outside. The cavity former also holds polystyrene beads which surround the fiber glass strips inside the cavity. The cavity former is placed inside of the tank and exposed to hot water. The beads expand against the cavity to form the handle and expand against the fiber glass strips to lock the same in the handle. The hot water is changed to cold and this lowers the temperature of the formed eraser which is then removed.

REFERENCES:
patent: 223844 (1880-01-01), Estabrook
patent: 2643158 (1953-06-01), Baldanza
patent: 2878069 (1959-03-01), Wessel, Jr.
patent: 3122787 (1964-03-01), Adams
patent: 3224039 (1965-12-01), Kracht
patent: 3268635 (1966-08-01), Kraus et al.
patent: 3610692 (1970-03-01), Van der Molen
patent: 3687413 (1972-08-01), Murfitt et al.
patent: 4007509 (1977-02-01), Odhner

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