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plasticize
plastificar

phthalates are chemical substances used to plasticize, or soften, pvc.
los ftalatos son sustancias químicas utilizadas para plastificar, o ablandar, el pvc.

in the continuous process, a stationary extruder plasticizes and pushes molten polymer through the head to form a continuous parison.
en el proceso continuo, un extrusor estático plastifica y empuja el polímero fundido a través del cabezal para formar un parison continuo.