Plastic additives in injection molding
Contents
1. The better the color, the better the sales of plastic
2. Tips for the selection of base resin additives for injection molding
Many times—maybe most of the time—the standard brown or translucent color of the base resin additives for injection molding used in injection molding will meet the requirements of the finished part well. For internal parts, small components, etc., the function is far more important than the appearance of the part. However, sometimes, the beauty of the part and the appearance of the finished product play a greater role, and standard, unattractive colors just don't cut it. Maybe the part is an external component. Maybe it was created for color-coded assembly. Or, you just want to differentiate from your competitors in some way. Before molding, a variety of additives can be used in the plastic particles in the injection molding to enhance their end-use performance. The most common and useful plastic additives in injection molding is pigmentation for plastic coloring.
The better the color, the better the sales of plastic
This means that sales are largely dependent on color. Plastic additives in injection molding can be added in a variety of ways. The greatest degree of pigment dispersion is achieved through mixing, which is carried out in a separate facility, and is usually the most expensive method. When specifying composite colors, plastic inventory becomes a major issue, especially when multiple colors may be included in the production plan. The most common and widely used method is dry coloring, which is carried out entirely in the molding plant. The finely divided pigment particles tumble together with the plastic material and adhere to the surface of the particles through the electrostatic charge generated by most of the resin. In some cases, coatings or wetting agents can be used in combination with dry pigments, such as adding a small amount of non-reactive oil to the mixture to ensure that the pigment adheres to the plastic particles in the injection molding. Dry coloring is the most economical system, but it also has some disadvantages. Since the paint only adheres to the plastic surface, care must be taken when transferring the material to the hopper. The colorant enters the surrounding air and contaminates other colors that may be used on other machines in the store. Every printing machine should use a hopper cover. The degree of dispersion of most plastic injection molding materials is different from the quality obtained by other methods. Screw plasticizer is very helpful for dispersion. Other ingredients are usually added to the plastic, such as antioxidants, stabilizers, lubricants, etc. In some cases, these ingredients can be added to plastic injection molding molds, but the best results are obtained when these ingredients are mixed into the base resin or concentrate. In general, these ingredients are used in a small proportion, and the use of dry tumbling to disperse them is the most difficult technique. Fortunately, for these situations, you can choose to add tint and color to plastic injection molded products through plastic colorants and concentrates. These are the base resin additives for injection molding and they greatly expand the aesthetic options of your parts.
Tips for the selection of base resin additives for injection molding
Injection molding usually starts with a base resin in the form of small beads, which are tiny hardened units of the material you choose. The base resin is charged into a hopper, melted into a liquid state at high temperature, and then injected into an injection mold, where it is cooled and returned to a solid state. Plastic colorants should be added in the first step of the process, often referred to as salt and pepper mixtures (because usually lighter colored solid base resin blocks are combined with darker colorant beads). This process usually allows the colorant to be blended into the base resin in an optimal way, which means that the finished part will have a uniform appearance without swirls, uneven color or tone, or incorrect color matching. However, even if you follow this process, other stores may still make mistakes and make the parts unusable. The mixing of base resins and plastic additives in injection molding is usually done manually, which is good-this process is believed to not produce better or worse results than machine mixing. Although the melting and injection process will be responsible for most of the work of mixing the colorant and the plastic particles in the injection molding together, it is still important to choose an injection molding mold supplier with the expertise to properly prepare the mixture-and know that the mixture should be What to include. In addition to the reactions between materials, the quality of the physical mixture may also change, usually in the same many ways as described above. Essentially, the base resin additives for injection molding is being diluted by the colorant, so it is important to plan and adjust the formulation for this, or to ensure that the colorant and resin are compatible and used together to achieve the desired results.
Tags: plastic additives in injection molding, plastic particles in the injection molding, the base resin additives for injection molding
