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Pressure And Temperature Control of Multicavity Injection Mold With Hydraulic Valve Gate Hot Mold System

IP.com Disclosure Number: IPCOM000037672D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Mirre, MW: AUTHOR

Abstract

A sensing and control device is provided for a multiple cavity plastic injection molding system. A mold 10 is shown having a plurality of cavities 12. The cavities are each fed by a nozzle 14 which nozzles are connected to a manifold 18. The manifold receives the plastic material from a molding machine 20. The flow to each nozzle is regulated by a gatevalve 22 which valves are each connected to a shut off control 24 which are responsive to signals to open or close the gate. Each nozzle is provided with a temperature control 26. Each cavity is provided with a pressure sensor 28 and a temperature sensor 30.

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Pressure And Temperature Control of Multicavity Injection Mold With Hydraulic Valve Gate Hot Mold System

A sensing and control device is provided for a multiple cavity plastic injection molding system. A mold 10 is shown having a plurality of cavities 12. The cavities are each fed by a nozzle 14 which nozzles are connected to a manifold
18. The manifold receives the plastic material from a molding machine 20. The flow to each nozzle is regulated by a gatevalve 22 which valves are each connected to a shut off control 24 which are responsive to signals to open or close the gate. Each nozzle is provided with a temperature control 26. Each cavity is provided with a pressure sensor 28 and a temperature sensor 30. Each sensor is connected to a microprocessor 32, which microprocessor in turn provides signals to the shut-off controls 24 responsive to the sensed pressure in each cavity and to the temperature controls 26 responsive to the temperature sensed in each cavity. The microprocessor 32 is programmed to also provide a signal to the molding machine when all the valves have been closed.

In operation, the manifold feeds the plastic material to each cavity through its respective nozzle. The temperature controller controls the temperature of the material being fed to each cavity individually. Also, the "shut-off" controllers shut off the flow to each cavity when a predetermined pressure has been reached indicating the cavity has been filed, while allowing the continuati...