What are the commonly used coloring methods for PP injection molding?

What are the commonly used coloring methods for PP injection molding?

The current application of PP injection molded parts is quite extensive. PP injection molded parts on the market are colorful and different in color, so how are the coloring of PP injection molded parts processed? Below we will briefly introduce three common coloring methods for injection molding.

1. The coloring method of PP injection molding compound pigment is the most accurate coloring technology for processing PP injection molded parts. It can produce accurate, reproducible and appropriate shades of color, which is most suitable for small batch production. Most commercial plastics are colored on injection molding machines, while most engineering plastics are already colored when they are sold.

2. The coloring method of PP injection molded parts is divided into granular material and liquid material, which can be adjusted into various colors. Among them, pellets are the most common. The color masterbatch can be used by mixing the plastic with the color masterbatch, and the mixture or the color masterbatch can be actually transported into the injection molding machine. Its advantages are: cheaper colors, reduced dust problems, lower raw material costs, and more convenient storage.

3. The dry toner coloring method for PP injection molding is the cheapest, and its disadvantage is that it is dusty and dirty when used. To ensure the uniformity and accuracy of the color during the production process, a specific size bag or carton can be used to fill the correct amount of dry toner. When using dry toner for coloring, the surface of the plastic particles must be covered with a uniform layer of colorant so that the color can be evenly dispersed in the melt. The mixing method and time must be standardized to ensure uniform coloring.

After the coloring step is determined, it must be persevering. In addition, it is necessary to prevent the toner from absorbing moisture during storage, otherwise it is easy to abrupt and cause markings on the PP injection molded parts.