| 摘要 |
<p>1422828 Moulding elastomeric containers GOODYEAR TIRE & RUBBER CO 10 July 1973 [11 Aug 1972] 32735/73 Heading B5A In a method of building a container having an access opening, e.g. a fuel cell, a destructible form is coated with a plastics film to form a flexible envelope thereon, a layer of release agent applied to the film, and an elastomeric container is built up on the thus coated form; the form is then destroyed and removed from the container by pulling the flexible envelope, containing the destroyed form, out through the access opening in the container. The method ensures that the inside of the container is clean and free from scaps of form material. In one example, a cardboard form with a flexible polyurethane envelope thereon is coated with polyethylene as a release agent and then used to form a polyurethane container by spraying. Successive layers of polyurethane, nylon (to form an impervious barrier layer) polyurethane, fabric reinforcement, and finally polyurethane are applied, the container cured, and the form destroyed by first soaking in water and then breaking up by blows from a rubber mallet. The envelope containing the fragments of form material was then removed from the container. In a second example, a plaster of Paris form is provided with a polyurethane envelope and a release coat of sugar and water and then used to produce a fuel cell by laying up of acrylonitrile butadiene rubber calendered nylon fabric, a sealing layer of natural rubber being provided between two of the layers. The form is broken up as in the first example and then removed. In addition to polyurethane, the flexible envelope may be of p.v.c. or rubber, and the barrier layer may be polyvinylidene chloride.</p> |
