How to color and color raw materials during injection molding

In injection molding, it is necessary to know how to match the color of raw materials, so as to reflect professionalism. The toner can be directly added to the resin method and the color masterbatch method. After the toner is directly mixed with the plastic resin, it is sent to the next step of the product molding process. The process is short and the cost is low, but the working environment is poor, the coloring power is poor, the coloring uniformity and quality stability are poor. Is poor quality for coloring. The color masterbatch method is that the colorant, carrier resin, dispersant, and other additives are formulated into pellets with a certain concentration of colorant. When the product is formed, a certain amount of color masterbatch is added according to the coloring requirements, so that the product contains the required amount of colorant. Coloring required. There is no doubt about it.


Generally speaking, masterbatches can be classified according to the resin to be colored, such as ABS masterbatch, PC masterbatch, PP masterbatch, etc.; they can also be classified according to the coloring resin processing process, including injection molding, blown film, and extrusion grades. Large class of masterbatches. In this way, due to the pretreatment of the pigments, the color masterbatch has high tinting strength, the dosage can be reduced and the quality is stable, the transportation, storage, and use are convenient, and the environmental pollution is greatly reduced. It can be regarded as a promising product. processing method.


It is worth mentioning that the dispersant removes surface air by wetting and penetrating the pigment, disperses aggregates and aggregates into fine, stable and uniform particles, and no longer aggregates during processing, which is very difficult for human beings. Valuable, the commonly used dispersant is low molecular weight polyethylene wax. EVA wax or oxidized polyethylene wax is used for organic pigments and carbon blacks that are difficult to disperse. Synthetic low molecular weight polyethylene wax and low molecular weight polyethylene wax produced by polyethylene cracking method have Very different. No introduction here.


Seriously speaking, the performance indicators of masterbatches include color difference, whiteness, yellowness, yellowing degree, thermal stability, oxygen index, melt flow rate, etc. These are very important indicators. Of course, the fineness of pigments, Migration, chemical resistance, and toxicity are also related to the performance of masterbatches. Some indicators are very important in special purposes, such as the fineness of the filter press value (DF value) of fiber-grade masterbatches, and some are also very useful. or reference value.


Here we take a look at computer color matching: the use of computers for color matching formulas and their management has been successfully used in plastic color matching. The computer color matching instrument has the following functions: (1) Color matching Establish a database of commonly used colors (dye) according to requirements. Then enter the incoming material swatches into the computer under the software menu, and immediately calculate a series of formulas, and list them in order of color difference and price for color selection; When unqualified, use the inconsistent reflection curve displayed on the monitor to directly increase or decrease the amount of pigment through the keyboard; (3) color measurement and color difference control; (4) color management with high work efficiency and easy confidentiality.


Color matching and coloring in injection molding processing is a unique skill, which requires us to treat it carefully and meticulously. There are roughly two methods for mixing, directly adding resin hair and masterbatch method. Color masterbatch can be classified according to different processes, transportation, storage, easy to use, and environment-friendly. The performance indicators of masterbatches are also worthy of detailed experience, among which thermal stability and chemical resistance are all related. Finally, it is about the scope of computer color matching. In the injection molding process, the computer is skillfully used to formulate color matching and manage color matching.