Gentle Injection Molding by Local Exclusion of Oxygen
In this paper, measures for gentle injection molding of thermoplastic polymers by reduction of thermo-oxidative stress are discussed. The effects of oxygen on the material properties are described as well. The single process steps were studied to identify the location and cause of degradation by oxygen using a systematic approach. As reported in this paper, thermooxidative degradation occurs in the plasticating unit. The degradation is caused by oxygen dissolved in the polymer resin as well as oxygen permeating into the feed section in-between the resin. A reduction in thermo-oxidative stress by exclusion of oxygen led to a decrease in chain-scission and an increase in transparency of amorphous thermoplastics.
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The Journal of Plastics Technology is a peer reviewed internet periodical published under the auspices of the Scientific Alliance of Polymer Technology (WAK)
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