초록 ▼

An improved machine for the production of foamed plastic molded parts, including soft foam plastics, i.e. for processing particles without foaming capacity, and including the processing of greatly frothed plastic foam particles, i.e. particles with but little foaming capacity, is obtained in that a

An improved machine for the production of foamed plastic molded parts, including soft foam plastics, i.e. for processing particles without foaming capacity, and including the processing of greatly frothed plastic foam particles, i.e. particles with but little foaming capacity, is obtained in that a pressure equalization system is provided which creates virtually equal pressure conditions while the mold cavity is being filled, i.e. the same overpressure in the material supply line as in the mold cavity. This makes it possible to introduce the foam particles, already compressed in the material supply system, into the mold cavity in a continuous flow by means of an injector, with excess foam particles being blown back into a tank provided in the material supply system by the injector after the mold cavity is filled. Due to this operating principle, the machine can be designed so that it can be set up for the processing of different materials such as soft foam particles, rigid foam particles and greatly expanded rigid foam particles.

대표청구항 ▼

A machine for the production of molded parts from foamed plastic, including soft foam plastics such as expanded olefin polymers and including plastic foam particles greatly expanded in frothing, in which machine there is provided a molding die having a cavity to be filled through a material inlet wi

A machine for the production of molded parts from foamed plastic, including soft foam plastics such as expanded olefin polymers and including plastic foam particles greatly expanded in frothing, in which machine there is provided a molding die having a cavity to be filled through a material inlet with expanded or with more or less frothed plastic particles under previously determined gas pressure conditions in its cavity, and in which machine there is a compressed gas operated filling device for the expanded particles, disposed in the material supply system for the molding die, characterized in that the filling device has an injector (31) with at least one injector nozzle (33) disposed in the area of its outlet (32) and connected to the molding die (11) and operating with compressed gas and has a material guiding canal (35) which is disposed ahead of the injector nozzle (33) in the material travel direction and which is connected to the material supply system by means of the material inlet (36), and further characterized in that there is a pressure equalization system (61) adapted to maintain in the material guiding canal (35) of the injector (31) and in the material supply system essentially the same gas pressure as in the cavity (23) of the molding die (11), said pressure equalization system having a venting canal and both the material guiding canal (35) of the injector (31) and the material supply system being connected to said pressure equalization system.