Parallel and conical twin-screw extruders have the same points:
The forced forward of the plastic conveying mechanism, good mixing plasticizing ability and dehydration capacity, have basically the same material and plastic products molding process adaptability.
Parallel and conical twin-screw extruder differences:
1.diameter: parallel twin-screw diameter of the same, the diameter of the small end of the conical twin-screw is different from the diameter of the large end.
2.Concentric distance: the center distance of the flat twin-screw is the same, the two axes of the conical twin-screw are in an angle, and the size of the center distance varies along the axis.
3. Length-diameter ratio: parallel twin screw (L/D) refers to the ratio of the effective part length of the screw to the outer circle of the screw, and tapered twin screw (L/D) refers to the ratio of the effective part length of the screw to the average value of the diameter of the big end and the small end.
Parallel Twin Screw Extruder
Due to the small center distance between the two screws, the space given to the radial and thrust bearings supporting the two output shafts and the associated transmission gears in the transmission gearbox is very limited, despite the efforts of the designers, but also can not solve the bearing capacity, gear modulus, small diameter, two screw tail diameter small reality, resulting in poor torque results. Small output torque, poor load resistance, parallel twin-screw extruder is the most significant defects. But the plasticity of aspect ratio is the advantage of the parallel twin screw, it can increase or decrease the aspect ratio according to the different molding conditions to meet the requirements of plastic processing technology, and can expand the application range of the parallel twin screw, but this point conical twin screw extruder is difficult to do.
Parallel twin-screw extruder is widely used in rubber and engineering resin filling, blending, modification, reinforcement, chlorinated polypropylene and super absorbent resin devolatilization treatment; Degradable Masterbatch, Polyamide polycondensation, polyurethane extrusion by adding polymerization reaction; Carbon powder, magnetic powder granulation, cable insulation materials, sheath materials, low smoke low halogen flame retardant PVC cable materials and various silane cross-linking materials preparation. Small models are mainly used for scientific research and teaching.
Conical Twin Screw Extruder
The conical twin screw extruder is a kind of high efficient mixing and extruding equipment. The machine has the characteristics of small shear rate, difficult decomposition of materials, uniform plasticizing and mixing, stable quality, high output, wide application range and long service life. With various specifications of Mold and auxiliary machine production line, you can directly PVC powder into pipes, plates, profiles and other plastic products of different cross-sections.
The two conical screws are arranged horizontally, and the two axes are put into the machine barrel at an angle. The center distance of the two axes gradually increases from the small end to the large end, which makes the two output shafts of the transmission gearbox have a larger center distance, the gears and gear shafts in these transmission systems, as well as the radial and thrust bearings that support them, have a large installation space, which can be used for larger sizes of radial and thrust bearings, each drive shaft has enough to meet the transmission torque diameter, so large working torque, large load capacity is a major feature of the conical twin-screw extruder. This point parallel twin screw extruder is incomparable.
