The extruded coating layer 4 may preferably be in {HEAD ~ a thickness} of 50 μm at maximum in view of {TAIL ~ working efficiency} 
The extruded coating layer 4 may preferably be in { HEAD ~ a thickness } of 50 μm at maximum in view of { TAIL ~ working efficiency }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL