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