Views: 222 Author: Site Editor Publish Time: 2020-07-13 Origin: Site
A color masterbatch, or color concentrate, is a granule used for coloring thermoplastics. It consists of one or more colorants and a polymer-specific carrier resin. The composition of a color masterbatch is called its recipe.
Colorants are classified into several categories: organic dyes, organic pigments and inorganic pigments.
Dyes are soluble in plastics and can therefore be used for transparent coloration. Pigments remain in their original particle form inside the plastic and need to be dispersed within the plastic.
A color masterbatch may contain up to 60% colorant. In the subsequent production process, the colorant is introduced into the melted plastic.
Color master batch is suitable for the diverse appearance and properties requirements placed on finish plastic articles. It is widely usded in extrusion coating, blowing film, threading yarn, injection molding, etc.
There are two processes for making color master batch, one is premix and the other is loss in weight feeding and extrusion.
Typical premix and extrusion line is: high speed mixer + screw loader + twin screw extruder + water cooling strand pelletizing line (water trough, blower, and pelletizer) + vibrating classifier + product silo
Following is the typical lab extruder for color master batch.
The line includes loss in weight feeder and extruder and the downstream pelletizing line.