Laminated structural body having unidirectionally arranged strands sandwiched between two web layers, and method of and apparatus for efficiently manufacturing such laminated structural body

A system for manufacturing a laminated structural body having two web layers with unidirectionally arranged strands sandwiched therebetween, comprising:

• (a) a web having an elongation of 100% or higher in a transverse direction thereof;
• (b) an apparatus comprising:
• a tube forming member for curving said web in a direction perpendicular to a longitudinal direction of the web to shape said web into a cylindrical web;
• delivery means for delivering said cylindrical web in a direction parallel to a central axis thereof;
• a cylindrical guide for supporting said web movably to keep said web curved as the cylindrical web while the web is being delivered by said delivery means;
• a spinning head disposed in said cylindrical web supported by said cylindrical guide and rotatable about a central axis of said cylindrical guide, for discharging a polymer liquid toward an inner surface of said cylindrical web to spin strands and laminating the strands on the inner surface of said cylindrical web, wherein all strands of said discharged polymer liquid are laminated on the inner surface of said cylindrical web;
• and
• folding means for folding flatwise said cylindrical web with the strands laminated thereon to sandwich said strands between the two folded layers of the web.