The color matching and coloring of raw materials must be known during the processing of injection molding medical devices in Dalian

Dalian injection molding medical device products must know how to color raw materials when processing, so as to reflect professionalism. The method of adding color powder directly into resin and color masterbatch can be used. After the toner is directly mixed with the plastic resin, it is sent to the next product molding process, which is short in process and low in cost. However, the working environment is poor, the coloring power is poor, and the coloring uniformity and quality stability are poor. It is due to the poor quality of coloring. The color master batch method is to prepare a certain concentration of color additive particles with color additive, carrier resin, dispersant and other additives. When molding the product, a certain amount of color master batch is added according to the color requirements, so that the product contains the required color dose and meets the color requirements. This is beyond doubt.

Generally speaking, color masterbatch can be classified according to the desired color resin, such as ABS color masterbatch, PC color masterbatch, PP color masterbatch, etc; It can also be classified according to the coloring resin adding process, including injection molding, film blowing and extrusion grade masterbatches. In terms of classification, color masterbatch can be regarded as a promising treatment method due to its high coloring power, reduced dosage, stable quality, convenient transportation, storage and use, and greatly reduced environmental pollution due to the pretreatment of pigments.

It is worth mentioning that dispersant removes surface air by wetting and penetrating pigments, disperses aggregates and aggregates into fine, stable and uniform particles, and no longer agglomerates during processing, which is very valuable. The commonly used dispersant is low molecular weight polyethylene wax, and EVA wax or oxidized polyethylene wax is used for organic pigments and carbon black that are difficult to disperse, There is a great difference between low molecular weight polyethylene wax synthesized by polyethylene pyrolysis and low molecular weight polyethylene wax. I won't introduce it here.

Seriously, the performance indicators of color masterbatch include color difference, whiteness, yellowness, yellowness, thermal stability, oxygen index, melt flow rate, etc. These are all very important indicators. Of course, the fineness, mobility, chemical resistance and toxicity of pigment are also related to the performance of color masterbatch. Some indicators are very important for special purposes, such as the fineness of filter pressure value (DF value) of fiber masterbatch, Some are also very useful or valuable for reference.

Here, let's take a look at computer color matching: computer color matching formula and its management have been successfully used in plastic color matching. The computer color matching instrument has the following functions: (1) Color matching establishes the database of common colors (dyes) according to the requirements. Then input the incoming color palette into the computer under the software menu, and immediately calculate a series of formulas, which are listed in order of color difference and price for color matching; (2) The formula correction computer lists the formula and the formula from other sources. When the color difference is unqualified, the inconsistent reflection curve displayed on the display is used to directly increase or decrease the amount of pigment through the keyboard; (3) Color measurement and color difference control; (4) Color management is efficient and easy to keep secret.

Color matching and coloring in injection molding process is a unique skill, which needs to be treated seriously and meticulously. There are roughly two methods for mixing, namely, directly adding resin hair and color masterbatch. Color masterbatch can also be classified according to different processes, which is convenient for transportation, storage and use and environmentally friendly. The performance indicators of color masterbatch are also worth careful experience. The thermal stability and chemical resistance are related. The last is about the range of computer color matching. In the injection molding process, skillfully use the computer to conduct color matching formula and manage color matching.