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Attention: During the process of EPS beads pre-expanding in Pre-Expander !
EPS production technology: Pre-expansion
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Excessive steam residence time and superheated steam will cause damage to EPS beads
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Prevent steam from overheating: Do not use thermal insulation material to keep the last 5-8 meters steam pipe from the steam pressure reducing valve to the pre-expander
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Pressure: 0.2-1.2bar = low heat content
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Must contain some moisture to create a condensation layer on the EPS surface to slow the transfer of heat to the EPS particles.
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Pre-expand EPS particles smoothly & uniformly
