This may be due to insufficient material feed with automatic charging of a vaporizer, for example, or to the formation of {HEAD ~ slag patches} on {TAIL ~ molten evaporation material} 
on
This may be due to insufficient material feed with automatic charging of a vaporizer , for example , or to the formation of { HEAD ~ slag patches } on { TAIL ~ molten evaporation material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL