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Retrofit for Plastic Resin Driers
Abstract
Plastic resins used in injection molding have to be
dried to specified levels prior to feeding them to the
molding machines. Excess moisture if present could cause
damage to the injection nozzle and also could cause polymer
degradations within the mold. The required dryness is
specified in dew point temperature units, and vary
depending on the resin, the mold and the molding process.
Typically the drier is set for the worst possible conditions.
So there are opportunities for energy savings. This study
conducted by Southern California Edison Company has
identified two opportunities for energy cost savings for the
customer. First, and the simplest is a control strategy to
delay the regeneration cycle to "nonpeak" which results in
dollar savings to the customer. The second involves
installation of dew point meters and a programmable
controller to tailor the regeneration cycle to the required
dew point temperature.
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Citation
Joseph, B.; Thuro, G. (1991). Retrofit for Plastic Resin Driers. Energy Systems Laboratory (http://esl.eslwin.tamu.edu). Available electronically from https : / /hdl .handle .net /1969 .1 /92221.