- Plastic Injection Principle
- The 3 categories of plastic injection dyeing methods
Choosing the right color for plastic products is the key to improving product texture. In the process of plastic injection, the common plastic dyeing methods are divided into three categories, : toner, masterbatch, and full extraction.
Before understanding the principle of plastic dyeing, let us first have an understanding of the basic concept of the original colors of different plastic raw materials. The following are the natural colors of several common plastic raw materials, The natural color of PP is milky white and transparent, PS and PC are completely transparent, ABS is of ivory white and opaque, and PA (Nylon) has a slightly transparent light yellow color.
If you want to produce products with a sense of transparency, it is recommended to use raw materials with a transparent color, such as PP and PC.
There are three categories of common plastic dyeing methods, namely "toner" dyeing, " masterbatch " dyeing and "full extraction" dyeing.
Before production, the raw materials and toner are uniformly stirred to allow the toner to fully adhere to the raw materials, and then poured into the machine, and the raw materials are heated, melted and mixed by the material tube. This is a very common dyeing method. Although the cost is the lowest, the color of the manufactured product is more likely to have color difference and uneven mixing.
After the toner is made into a granular shape, it is mixed with the raw materials evenly. Then, pour into the machine, then melt and mix the mixture through the material tube. The stability of color masterbatch is higher than that of toner, but because the purchase of color masterbatch has a requirement of minimum order quantity, when the quantity of the product is small, the unused color masterbatch may become excess stock.
Full extraction dyeing
First, the raw materials and a certain proportion of dyes are melted and mixed, and then re-made into plastics of designated colors, and then poured into the production machine. This method has the highest color stability, and there will be no uneven mixing, but the minimum order quantity is much higher than that of color masterbatches, so when the number of products is small, it is rarely used due to cost considerations.
The following is a comparison form of three plastic dyeing methods. Among them, the cost of toner is the lowest, and the stability of full extraction dyeing is the best. As to which dyeing method is a better choice, you would need to take into consideration the cost of the product, the amount of product, and the quality of color requirements of the product.