Abstract: A mixture of water and surfactant is introduced interiorly of a parison in the course of blow molding thereof. Lessening of die closure time and improved conformity of dimensions of molded articles to corresponding dimensions of forming dies are achieved.

Abstract: A novel procedure for circulating blowing air through an injection blow molded article during the blow cooling cycle of an injection molding process is described. The technique involves the use of a new core rod assembly which permits internal circulation of cool air during the blow cooling cycle of the process. The described assembly may also be used for reconditioning itself by the use of heated air, so avoiding the phenomenon of core rod freeze-up.

Abstract: The invention relates to a method of producing an article comprising a hollow three dimensional array of reinforcement elements encapsulated in a thermoplastic material, whereby a hollow parison of said thermoplastic material is located within said array of reinforcement elements, said reinforcement array being located in a mould spaced apart from the mould surface, and said parison being expanded into conformity with said mould surface to encapsulate said reinforcement by the production of a pressure drop across the wall of said parison.

Abstract: A method is disclosed for making a cuff or balloon for use with an endotracheal tube by means of a cold parison blow molding process. The method may be utilized for large quantity production of such cuffs yet affords reliable control of the thickness throughout the cuff. In carrying out the method, a thermoplastic or other elastomeric tube of predetermined dimensions and elasticity is prestretched a predetermined amount in the longitudinal direction. The tube is positioned within a hollow mold or, for quantity production in a series of such molds, having the mold internal configuration in the general shape of the desired end balloon form. The mold or molds are vented to atmosphere. Pressure is applied to the interior of the tube and such predetermined pressure is retained within the tube. The tube and mold(s) are then heated such that the tube softens and expands under the pressure to assume internal configuration of the mold(s).