Abstract: A new and improved apparatus and method for producing torsion cords comprising the steps of: (1) casting a torsion cord of a rubber composition, the mold having a high pressure resistant cylindrical wall and opposite closed ends, (2) efficiently curing the rubber composition at a moderate temperature and high pressure for an extended period of time in the mold, (3) reducing the pressure in the mold, and (4) removing the molded torsion cord from the mold. An improved torsion cord manufactured by the method of the invention is also provided having closely controlled dimensions and improved physical properties with fewer process control procedures.

Abstract: A mold structure, especially a multi-cavity mold, and more particularly still, a mold structure in which rubber-like elements and the like can be molded with a minimum of flash. The mold structure is formed of multiple plates moveably connected together having mounted therein the cavity forming insert elements. The upper plate includes a chamber on top which receives the material to be molded and which material is transferred by a ram member from the chamber through suitable sprues in the insert elements in the top plate into the mold cavities which are to be filled. The mold cavities are formed by insert elements detachably mounted in the several plates making up the mold structure and include insert elements interposed between the chamber which receives the raw molding material and the cavities and which last mentioned insert elements are flexibly connected with the respective plate.