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US 6,071,462 AGranted
Compounding injection molding combined process
AssigneeIntrafico Intercontinental Trade & Finance Co. Establ.
InventorPeter Putsch
Life of this patent
Estimating the term…
Abstract
A process is disclosed for recycling plastic materials. The previously sorted plastic material wastes are comminuted, mixed, melted and homogenized during a first step, and the raw materials thus recovered are immediately stocked in a storage chamber (12) or buffer reservoir, then supplied to an injection and moulding device (13). During their temporary storage, the raw materials are exposed if necessary to a regulated temperature.
Claims10
A method for molding a product from recycled plastic which has been presorted, comprising the steps of:
- kneading the recycled presorted plastic substantially continuously so that it is simultaneously comminuted, mixed, heated, melted and homogenized;
- passing the kneaded plastic to an intermediate buffer reservoir:
- intermediately storing the kneaded plastic at a controlled temperature in said intermediate buffer reservoir;
- supplying the kneaded plastic, after said intermediate storage, to injection molding equipment;
- molding said kneaded plastic into a product in said injection molding equipment, said molding step being effected intermittently;
- and
- effecting quasi-continuous flow of plastic material from said kneading step, said passing step, said intermediate storing step, and said supplying step with said intermediate storing step compensating for the difference in the plastic material flowing from step to step.
4 more elements
A method for molding a plastic product from recycled waste plastic material which has been presorted comprising the steps of:
- simultaneously and continuously comminuting, mixing, heating, melting and homogenizing said presorted, recycled waste plastic material in a kneader;
- continuously passing said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material to an intermediate buffer reservoir;
- intermediately and temporarily storing said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material in said intermediate buffer reservoir;
- controlling the temperature of said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material in said intermediate buffer reservoir;
- intermittently supplying said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material from said intermediate buffer reservoir to injection molding equipment;
- intermittently molding said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material into a plastic product in said injection molding equipment;
- and
- effecting quasi-continuous flow of said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material from said simultaneously and continuously comminuting, mixing, heating, melting and homogenizing step, to said continuously passing step, to said intermediately and temporarily storing step, to said intermittently supplying step and to said intermittently molding step with said intermediately and temporarily storing step compensating for the difference in the flow of said plastic material between said continuously passing step and said intermittently molding step.
5 more elements
A method for molding a plastic product comprising:
- providing a recycled waste plastic material;
- presorting said recycled waste plastic material;
- simultaneously and continuously comminuting, mixing, heating, melting and homogenizing said presorted, recycled waste plastic material in a kneader;
- continuously passing said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material to an intermediate buffer reservoir;
- intermediately and temporarily storing said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material in said intermediate buffer reservoir;
- controlling the temperature of said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material in said intermediate buffer reservoir;
- intermittently supplying said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material from said intermediate buffer reservoir to injection molding equipment;
- intermittently molding said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material into a plastic product in said injection molding equipment;
- and
- effecting quasi-continuous flow of said simultaneously and continuously comminuted, mixed, heated, melted and homogenized plastic material from said simultaneously and continuously comminuting, mixing, heating, melting and homogenizing step, to said continuously passing step, to said intermediately and temporarily storing step, to said intermittently supplying step and to said intermittently molding step with said intermediately and temporarily storing step compensating for the difference in the flow of said plastic material between said continuously passing step and said intermittently molding step.
7 more elements
Dependencies are inferred from the claim text.