The reason of the uneven insulation surface of the cable in Henan YJV power cable Co., Ltd

  　　  Reasons for uneven cable insulation surface of Zhengzhou first cable Co
, Ltd
A common phenomenon in the cable production process is that the insulation surface of the cable will be uneven, and there are many reasons for this problem
The following are the common four reasons summarized Firstly, the most common reason for the uneven cable insulation is the stability of raw materials
For example, the uneven mixing of various components of cross-linked polyethylene materials will cause the concentrated antioxidant to be heated and gasified after the insulating material is extruded at high temperature by the extruder, forming a drum in the insulating layer, and finally showing an uneven appearance
In addition, it is caused by improper material storage
In the weak storage environment, there is heavy high temperature and moisture, so some moisture will enter the material, which will eventually lead to the unsmooth insulation surface Another major cause of uneven cable insulation is the phenomenon of raw glue
Sometimes, the cross-linked insulation core will have the phenomenon of raw glue in the production process
The reason for this phenomenon is that the temperature of the neck or head is not enough, resulting in the generation of internal local cold glue, or the local plasticization caused by insufficient body temperature or shear force
Another case is when the gasket of the filter screen is not in place, Finally, it will affect the extrusion pressure of cross-linked insulating material and produce raw rubber, resulting in concave convex hard blocks on the surface of insulating wire core There is also a phenomenon called old glue phenomenon, which is caused by the high temperature of the die when the cross-linked material is extruded or the dead corner of the cross-linked material staying in the flow channel for a long time
The old glue is amber
The longer the residence time is, the darker the color is, the higher the temperature is, the darker the color is The last reason for the unevenness of the cable insulation surface is the problem of the cooling process
Generally, there are bubbles on the cable surface during the production process
When the cable enters the water, some of these bubbles will be small, but some will adhere to the cable surface
After the cable is cooled, a small package will appear at this position
This is because the existence of bubbles causes this part of the insulation surface to be covered with air, So it becomes uneven