Plastic sheet extruder 3) medium screw thread depth gradient using isometric and full thread type, its aspect ratio is larger than the small screw thread pitch equal, from the roots from shallow to deep. Threaded ends deeper roots of the thread is shallow, so many plastic extrusion rate, without affecting the strength of the screw extrusion speed, good plasticizing, is generally sized extruder production of insulation layer and care Ideal screw jacketed. (4) large screw diameter of 150mm or more general, such as φ150, φ200, φ250 extruder. Large screw in two types, one is equidistant ranging from deep, such as φ150, φ200 extruder; the second is a screw three sections, namely isometric and other deep, deep isometric ranging, ranging from non-isometric deep, as φ250 extruder, the compression ratio is between 2 to 3 aspect ratio of 15: 1 or so, mainly for the production of wire and cable insulation and sheathing layer of large cross-section Second, the main parameters of the main parameters of the screw of the screw diameter aspect ratio, compression ratio, pitch, groove width, groove depth, gaps helix angle between screw and barrel, these parameters have a significant impact on the extrusion process and performance. 1. Screw the screw diameter Ds to meet the needs of different types of plastics processing, screw type, there are many common are the following: graded (equidistant ranging depth), graded-index (such as deep not equidistant). mutant, select the type of selection torpedo head screw type, etc. 1. Screw mainly based on the physical properties of plastics and production of technical specifications to determine the extruder. (1) non-crystalline polymer softening within a relatively wide temperature completed, generally used in isometric gradient screws. Crystalline polymer melt temperature range is relatively narrow, generally used in isometric mutation screw. (2) in a small extruder, such as a φ45 extruder screw used is equidistant unequal deep full flight type screw small aspect ratio, is mainly used for a small section of the extruded insulation and sheathing layer, extrusion speed. (I.e., the production capacity of a screw diameter (extrusion amount of thread diameter, extruder) is approximately proportional to the square of the diameter of the screw, the other conditions being the same, a little increase in the diameter of the screw, will cause a significant increase in the amount of extrusion its influence even more than the effect of improving the number of revolutions of the screw extrusion amount is greater. http://2657923.s.toocle.com/ http://mayu1991619.cn.cn5135.com PVC imitation marble sheet extrusion machine http://mayu1991619.dginfo.com halogen cable material granulator http://mayu1991619.maijx.com/ barium sulfate filler granulator http://mayu1991619.b2b110.com/ / EPDM sheet Extruder http://www.jiancai365.cn/co_170014.htm halogen cable material granulator http://zssl305929.zssl.net/ halogen cable material granulator http: // mayu1991619. zssl.net/ halogen cable material granulator