Underwater pelletizer and heat exchanger die plate

Details Underwater pelletizer and heat exchanger die plate Underwater pelletizer and heat exchanger die plate

1976-03-29

1978-10-31

Lazarus, Richard B.

Plastic article or earthenware shaping or treating: apparatus

Immersed shaping orifice discharging directly into liquid...

425378R, 425379R, B29F 308

Patent

active

041232070

ABSTRACT:
An underwater pelletizer and heat exchanger die plate combination for solidifying molten polymer entering the machine at one end and cutting the solidified fibers into small pieces or pellets. A die plate incorporating steam heated tubes allows molten plastic under high pressure to be forced therethrough into a water bath. Two or more rotating knives within the water bath rotating on the face of the die plate sever or cut up the solidified plastic into small pellets. A quick access coupling is provided for the water bath compartment and a floating ball bearing adjustment means for varying the distance between the rotating knives and the die plate is provided to permit very accurate variation of the distance between the knives and the die plate surface. An overall support frame is provided for the entire structure which is movably mounted on rollers which are also adjustable. A number of unique features are included, such as the use of welded tubes of high thermal conductivity with drilled interconnecting holes between the cylindrical steam chambers and a low thermal conductivity die face to prevent polymer freeze-off. An adjustable speed drive having the driven pulley in the middle of the shaft to provide good access to the knife adjustment means is also provided.

REFERENCES:
patent: 3337913 (1967-08-01), List
patent: 3452394 (1969-07-01), McNeal
patent: 3477098 (1969-11-01), Swickard et al.
patent: 3832114 (1974-08-01), Yoshida
patent: 3912434 (1975-10-01), Nagahara et al.

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