MOLD FOR PRODUCTION OF HOLLOW RUBBER ARTICLES, DIAPHRAGMS FOR EXAMPLE Russian patent published in 2006 - IPC B29C33/02 B29C33/44 B29C35/02 B29C45/02 

FIELD: production of hollow rubber articles, diaphragms for example.

SUBSTANCE: proposed mold has external bead on neck and upper, middle and lower molding plates and solid core with air valve. All plates and core are provided with heaters. Lower plate has molding section on inner surface of article. Middle plate is solid in construction; it is used as limiter for relief of diaphragm with compressed air and may be extended together with core and article mold for relief beyond it. Upper plate has pouring gate. Mold has at least one lock for holding the plates in closed position. Provision is made for use of middle solid plate as limiter against excessive bulging of article during its removal, thus keeping article intact during removal.

EFFECT: improved quality of articles; facilitated procedure of removing articles from core.

2 dwg