... Rotary head 3)CE,ISO,SGS certificate 4)use make bag,package film blowing machine, plastic film blowing machine, film making machine ... machineSJ-B50/55/65 ROTARY HEAD FILM BLOWING MACHINE Use:This machine set is used for ... and corrosion resistance., Scientifically designed, this machine set has two heads for one extruder ... B65-1 Screw Diameter 50mm55mm65mm65mmScrew Ratio(L/D) 28:128:128:128:1Screw Speed ...