... T-shirt bag making single screw double die blowing machine blown film machine,film making machine,plastic making machine,extrucisiont-shirt bag film ... film of (LDPE),(hdpe) and (LLDPE) ,single screw double die film blowing machine setSJ-55 Single screw double die film blowing ... high hardness,strong resistance to corrosion,durable serviceThe die head is plated with hard chrome,of screw mandrel type ...