Method for producing molded hose branches from rubber and a hose produced by the method

DETAILED DESCRIPTION With the foregoing and other objects in view there is provided, in accordance with the invention, a method for producing molded hose branches of rubber, which comprises slipping completely vulcanized rubber hose lengths with ends onto free ends of a plastic tubing branching piece for forming an assembly, placing the assembly into a mold, and injection molding a thermoplastic rubber material being a blended mixture of polypropylene and EPDM (ethylene-propylene-diene-monomer) around the assembly for joining the thermoplastic material to the rubber hose lengths for forming a sleeve around the rubber hose lengths and free parts of the tubing branching piece between the ends of the rubber hose lengths.
The mixture of polypropylene and EPDM affords an integral and very firm bond between the sleeve and the rubber hose lengths.
The sleeve and the rubber hose lengths are virtually fused by the injection molded thermoplastic composition.
In accordance with another mode of the invention, there is provided a method which comprises joining the thermoplastic composition to the polymer of the rubber of the rubber hose lengths in a molten state, forming a sleeve bonded to the rubber hose lengths.
In accordance with a further mode of the invention, there is provided a method which comprises placing the tubing branching piece with the rubber hose lengths slipped thereon in an injection mold defining a space therebetween, and filling the space with the thermoplastic composition during the injection molding step.
Cross-spraying with such a material that bonds to the rubber hoses and has a high modulus of elasticity, on the one hand assures a firm and fluid-tight coupling and retention of the hoses on the tubing branching piece and on the other hand reliably prevents the hoses from stretching outward and thus being able to come loose from the tubing branching piece over the course of time under load and operating conditions.
In accordance with an added mode of the invention, there is provided a method which comprises selecting a polyolefin as the thermoplastic composition