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