1. Direct correlation between color depth and addition amount
The addition amount of masterbatch is one of the key factors that determine the color depth of plastic products. Generally speaking, as the addition amount of masterbatch gradually increases, the color of plastic products will gradually become darker. This is because masterbatch contains a high concentration of pigment components. When more masterbatch is mixed into the plastic raw material, the number of pigment particles per unit volume increases, and the absorption and reflection characteristics of light change, making the color visually more intense. For example, when producing dark gray plastic products, a small amount of masterbatch may only make the product appear light gray, and gradually increasing the proportion of masterbatch can accurately mix the required dark gray tone. However, the addition amount of masterbatch cannot be increased indefinitely. When it exceeds a certain proportion, it may cause other problems, such as affecting the physical properties of plastic products.
2. Mechanism of influence on color uniformity
The addition amount of masterbatch not only affects the color depth, but is also closely related to color uniformity. Within a reasonable addition amount range, if the masterbatch can be fully dispersed in the plastic raw material, better color uniformity can be achieved. However, if the amount added is too little, the pigment may be unevenly distributed in the plastic matrix, resulting in local lighter or darker colors, just like when a small amount of black masterbatch is added to white plastic, if the dispersion is not good, black spots or stripes will be produced, which will seriously damage the appearance quality of the product. On the contrary, if the amount added is too much, the color distribution may be biased due to the agglomeration of masterbatch itself or the uneven mixing with the plastic raw materials, making the surface of the plastic product present a mottled color effect.
3. Synergy between processing technology and addition amount
The amount of masterbatch added and the color uniformity of plastic products are also affected by the processing technology. In the plastic processing process, such as extrusion, injection molding and other process links, parameters such as temperature and shear force will affect the dispersion state of masterbatch in plastic. Appropriate processing temperature and shear force can help masterbatch better disperse in the plastic melt, and even at relatively high addition amounts, color uniformity can be guaranteed. For example, in the injection molding process, the shear force generated by the higher screw speed can break the masterbatch into smaller particles and evenly distribute them in the plastic. However, if the processing parameters are not set properly, even if the masterbatch addition amount is within a reasonable range, it is difficult to obtain the ideal color uniformity effect, and the color stability and uniformity may even be further affected by problems such as thermal degradation or mechanical damage during processing.
4. Optimize the addition amount and quality control
In order to obtain the ideal color depth and uniformity, the masterbatch addition amount needs to be accurately optimized and strictly controlled. In the product development stage, a large number of experiments should be conducted to test the effect of different addition amounts on the color, and the optimal addition amount range should be determined in combination with the performance requirements of plastic products. At the same time, in the production process, advanced metering equipment and mixing equipment should be used to ensure the accuracy and uniformity of the masterbatch addition amount. In addition, color detection and quality sampling of products should be carried out regularly, and the masterbatch addition amount or processing parameters should be adjusted in time to ensure that the color quality of plastic products always meets the standard requirements and meet the market demand for high-quality plastic products.
