At the declining ramp 20, i.e. downstream of threshold 18, there occurs a vertically directed suction flow prompting {HEAD ~ the lateral gathering} of fibre fleece 4 into {TAIL ~ a fibre sliver} 
into
At the declining ramp 20 , i.e. downstream of threshold 18 , there occurs a vertically directed suction flow prompting { HEAD ~ the lateral gathering } of fibre fleece 4 into { TAIL ~ a fibre sliver }
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 HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL