Method of and apparatus for extrusion-molding a laminated parison, and a vessel produced from the laminated parison

An extrusion molding apparatus comprising a die head provided with an extrusion nozzle;

• a plurality of first, second, third and fourth annular nozzles, and inner and outer main material flow passages, each of said annular nozzles and said flow passages having first ends connected to said extrusion nozzle;
• a main material extruder connected to a second end of said inner and outer main material flow passages;
• an adhesive material extruder connected to a second end of said first and third annular nozzles;
• a reclaimed material extruder connected to a second end of said fourth annular nozzle;
• and a barrier material extruder connected to a second end of said second annular nozzle, for extruding inner and outer main materials, first and second adhesive materials, a reclaimed material and a barrier material, respectively, through said extrusion nozzle to form a laminated parison;
• the barrier material extruder having a cylinder connected to said second annular nozzle for supplying the barrier material, said cylinder extending into said second annular nozzle;
• said cylinder including a screw therein, said screw having an end portion;
• said second annular nozzle having a ridge situated opposite to said end portion of said screw (9A), whereby said barrier material core layer which is extruded from said end portion of said screw is divided by said ridge as it enters said second annular nozzle;
• and
• said fourth annular nozzle for supplying said reclaimed material being formed by a cap ring and a first spider ring of said die head, said fourth annular nozzle being connected to a groove which is formed in an end surface of said first spider ring, and said fourth annular nozzle being situated inside said outer main material flow passage.