The color masterbatch used in the cable material is usually a special color masterbatch, so as to ensure that the color of each batch of cables is uniform. The color masterbatch used for cable materials usually has its own model specifications, such as "BK-30", which means PVC black color masterbatch, and "BU-40" means PE blue color masterbatch.
So what are the common problems when using masterbatch for cable materials?
1. Two-color line cracking problem
The color masterbatch used in the cable material is usually a special color masterbatch, so as to ensure that the color of each batch of cables is uniform. The color masterbatch used for cable materials usually has its own model specifications, such as "BK-30", which means PVC black color masterbatch, and "BU-40" means PE blue color masterbatch.
So what are the common problems when using masterbatch for cable materials?
1. Two-color line cracking problem
When the cable is extruded, short color channels sometimes appear on the surface, which affects the appearance of the cable. The reasons for this phenomenon are:
① There are residual masterbatch in the mixer, and the remaining masterbatch will be extruded with the new material, causing color channels on the surface of the cable.
Solution: Clean the mixer before mixing to avoid mixing impurities.
②The problem of masterbatch formulation. Such as when using orange masterbatch. The red channel appears because it is used to produce too much red in the masterbatch.
Solution: This problem can only be solved by changing the ratio of red to yellow in the color pigment.
③The excavator is not clean, and there is still old material in the extruder. The old material and new material are extruded together during extrusion, resulting in color channels.
Solution: Dig the machine clean before extrusion, pay attention to the color of the material when discharging, and base after full discharging to avoid color channels.
3. The problem of lump on the cable surface
The lump on the surface of the cable not only affects its appearance, but also reduces its electrical properties (such as breakdown voltage, etc.); the reason for this phenomenon is that the masterbatch is incompatible with the material.
If PVC masterbatch is used in PE material. The extrusion temperature of PVC is 175°C and that of PE is 220°C. When the PE material melts and starts to be extruded, the PVC masterbatch has turned into a paste, and a black paste will appear on the surface of the cable. If PE masterbatch is used in the PVC material, when the PVC material melts and starts to be extruded, the PE masterbatch has not melted, and raw material will appear on the surface of the cable.
In order to avoid this phenomenon, professional masterbatch must be used to make the masterbatch compatible with this material.
All in all, the proportion of the masterbatch used in the cable material depends on the customer's color of the cable and the coloring effect of the masterbatch. If the ratio is too large or too small, the cable color will be affected. Usually the proportion of masterbatch in PVC material is 1.5%, and that of PE material is 3.0%
