... the The scopes of screw diameter are from 30mm to 250mm, the L/D ratios are from 20,25,28,30,32 ... ,35 to 50,52. The extruders are extensivelymade to process the different raw material, such as PE ... parts, suchas the barrel,the screw,and the reducer, are designed and manufactured by RUNHUA Co., Ltd. And the company has the ...