... mixed the feeding systemB, level 1 extrusion system:C, foaming agent injection system: is the key link in the production ... level 1 extrusion hydraulic change nets system:E, level 2 extrusion system:F, head mould system:G, cooling finalize the design ... systemH, level 1 traction system:I, transportation cooling system:J. level 2 traction system:K. longitudinal cutting system:L. transverse cutting systemM, ...