The effect of {TAIL ~ the air pressure} 14 is to engage the layers 3 with the moulding surface 11 and to densify the layers 3, the densification causing {HEAD ~ a 20 to 30% reduction} in the thickness e of the article 1 
The effect of { TAIL ~ the air pressure } 14 is to engage the layers 3 with the moulding surface 11 and to densify the layers 3 , the densification causing { HEAD ~ a 20 to 30 % reduction } in the thickness e of the article 1
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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 HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH