| http://www.w3.org/ns/prov#value | - The extruding method of claim 1, wherein a lateral sectional dimension at the constricting passage is reduced 10 to 15% from an inlet end to an outlet end by an area reduction ratio AR, AR being defined by the following equation: AR=(S-S')???100/S wherein S is a sectional area of the inlet end of the constricting passage, and S' is a sectional area of the outlet end of the constricting passage. 10
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