{HEAD ~ The maximum useful proportion} of blowing agent in the flowable, foamable gel is also affected by the pressure which is maintained on the gel in {TAIL ~ the extrusion} die passage, being greater when the die pressure is relatively higher under conditions such as when the die orifice is relatively smaller and the through put rate is relatively greater 
{ HEAD ~ The maximum useful proportion } of blowing agent in the flowable , foamable gel is also affected by the pressure which is maintained on the gel in { TAIL ~ the extrusion } die passage , being greater when the die pressure is relatively higher under conditions such as when the die orifice is relatively smaller and the through put rate is relatively greater
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