1. Scratches on the cable surface: If the eye mold is scratched, replace the
eye mold in time
(1) If the wire guide wheel and wire storage rack are scratched, find the
problem point in time and adjust it immediately to solve it.
(2) Slag accumulation on the outer eye can also cause scratches. The material
should be replaced fundamentally. Secondly, the problem of scratches on the
outer eye caused by slag accumulation can be solved by increasing the extrusion
temperature and replacing the outer mold with a slightly smaller aperture
(without corridor section).
2. Extruded plastic burns
Plastic burns are common quality defects in the plastic extrusion process.
The noticeable manifestations are: the temperature display is too high; there is
a lot of smoke and strong irritating smell at the die mouth, and there is a
bursting sound in severe cases; there are burnt particles in the extruded
plastic layer; there are continuous bubbles at the glue joint; the main reasons
for the occurrence are:
(1) The temperature control is too high to reach the plastic thermal
degradation temperature;
(2) The screw has not been cleaned for a long time, and the accumulated burnt
materials are extruded with the molten plastic;
(3) The heating or shutdown time is too long, causing the plastic in the
barrel to be heated for a long time and decompose;
(4) The temperature control instrument is out of control or inaccurate,
causing high-temperature decomposition;
(5) The extruder cooling system is not turned on, causing the material to
overheat due to shear friction.
Therefore, during the production process of the extruder, it is necessary to
strengthen the inspection of whether the heating and cooling systems are working
normally; the extruder temperature setting should be based on the process
requirements and the screw speed; the heating time should be reasonably
controlled, and the extrusion system should be cleaned regularly.
3. Uneven outer diameter
Improper human control, pay attention to abnormal acceleration and
deceleration, tension of the pay-off rack and take-up wire tension, abnormal
measuring tools, etc.
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Jinghan Machinery (Dongguan) Co., Ltd.
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