Moulding processes and apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 25, 1997
Issued Date -
N/A
app pub date -
Aug 8, 1994
filing date -
Jan 18, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process and apparatus is provided for the moulding of a product formed from the mixing of a plurality of different feedstocks where different ratios of the feedstock materials are required in different areas or sections of a mould to produce a product with different properties in the different areas or sections of the final moulded product. A plurality of streams of the different feedstocks, each from separate feedstock supply vessels, are combined to form a mixed feedstock in a delivery head or heads prior to delivery to the mould. Separate pumps are provided to deliver, at constant speed of operation, a predetermined volume of each feedstock at a predetermined flow rate to the mould during a moulding cycle, driven by an electric motor operating at constant speed under constant load. A first feedback control system for each feedstock stream detects variations in the feedstock flow rate by way of flow meters located between the pumps and the delivery head or heads, compares the flow rate with a predetermined flow rate and varies the speed of operation of the pump in response to variations from the predetermined flow rate.
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