Twin-screw extruder quality identification

twin-screw extruder is an extrusion molding equipment widely used in chemical industry, food, medicine and other fields. Its structure is simple and consists of two rotating screws, a rotor and a barrel. The radial clearance of the screw is very small, enabling efficient mixing and plasticizing. During the extrusion process, the material is added to the barrel from the feeding port, and is extruded into shape as the screw rotates and heats. Twin-screw extruders usually also include auxiliary devices such as vacuum exhaust, cooling, shearing, exhaust and temperature measurement.
twin-screw extruder is widely used in plastic product processing industry, such as pipes, plates, rods, wires, etc. During the extrusion process, it has the advantages of high degree of fusion, good uniformity, fast molding speed, high production efficiency, and stable quality of finished products. In addition, twin-screw extruders are also used in rubber, food, pharmaceutical and other fields.
In twin-screw extruder quality appraisal cases, Zhongke Testing can provide twin-screw extruder quality appraisal services.

1. Co-rotating twin-screw extruder
Co-rotating twin-screw extruder refers to an extruder with two screws rotating in the same direction. It is suitable for materials with different viscosities, such as plastics, rubber, coatings, etc.
2. Counter-rotating twin-screw extruder
counter-rotating twin-screw extruder refers to an extruder with two screws rotating in opposite directions. It is suitable for materials that require high dispersion, such as color masterbatch, dyes, fillers, etc.
3. Screw counter-rotating counter-rotating co-extrusion system
screw counter-rotating counter-rotating co-extrusion system refers to an extruder with two counter-rotating screws. Through the common feeding and traction mechanism, two different materials are extruded together, which is suitable for the production of composite materials.
4. Stretch Extrusion Extruder
Stretch Extrusion Extruder refers to extruding the material into shape first, and then stretching the material to form filaments or films.

HG/T 6129-2022 Extruder for polylactic acid-based composite materials
GB 25431.1-2010 Rubber plastic extruder and extrusion production line Part 1: Safety requirements for extruders
GB/T 33580-2017 Rubber plastic extruder energy consumption detection method
HG/T 3110-2009 Rubber single-screw extruder
HG/T 3230-2009 Rubber single-screw extruder testing method
HG/T 3798-2005 Pin barrel cold feed extruder
HG/T 3799-2005 Pin barrel cold feeding extruder testing method
HG/T 4274-2011 Thermosetting powder coating extruder
JB/T 11343-2013 Conical co-rotating twin-screw plastic extruder
JB/T 5417-2007 Plastic exhaust extruder
0JB/T 5420-2014 Co-rotating twin-screw plastic extruder
1JB/T 6491-2015 Counter-rotating twin-screw plastic extruder
2JB/T 6492-2014 Conical counter-rotating twin-screw plastic extruder
3JB/T 8061-2011 Single screw plastic extruder
4JC/T 343-2012 Vacuum extruder
5JC/T 662-2011 Mixing extruder for wall material industry
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According to the situation reported by the client and the information provided, the client signed three contracts with the supplier, and the supplier provided 18 screw extruders to the client, which were installed and debugged by the supplier to form six production lines, which were gradually put into use for the production of resin tiles. At the end of
XX, the six production lines broke down one after another. The main problem was that the multiple reduction gearboxes of the 65 and 80 type twin-screw extruders and the spline couplings of the distributor were seriously worn and damaged, the bearings were damaged, and the distributor spindle even broke.
Although the supplier sent people to perform on-site replacement and repairs and brought the reduction gearbox and distributor back for repair, the same quality problems still occurred many times after reuse and could not be completely solved.
In order to further identify the cause of the accident, the client entrusted our company to conduct a quality analysis on whether there were quality problems with this batch of screw extruders.
identification analysis results: The
expert group conducted discussions and comprehensive technical analysis based on the relevant information of the "twin-screw extruder" provided by the client, the on-site investigation and inspection results, and the sampling inspection results, and made the following quality analysis Opinion: Frequent failures in the "reduction box" and "distribution box" of the "twin-screw extruder" commissioned by
are due to the fact that the manufacturer did not install a positioning device when installing the equipment, and there was a large installation deviation between the output shaft of the "reduction box" and the spindle of the "distribution box".