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MIXACO for Color Pigment Processing
Good Pre-Mixing is Key to High-Quality Products
Major pigment manufacturers have recognized the importance of intensively pre-mixing pigments into master batches for extrusion and subsequent granulation. A good pre-mixing process must fulfill a number of different requirements.
Pre-mixing plays a major role in determining the dispersion of the individual ingredients in a recipe and ensuring the highest level of distribution of the pigments. The better the dispersion and homogenization process can be controlled, the more efficiently the pre- mixed material can be used. The dispersive choppers with adjustable
circumferential speeds provide flexibility to enable materials with a strong coagulation tendency to be broken down to the smallest possible size by mechanical means. This presents a major challenge with regard to the optimum mixer configuration, especially in the case of organic pigments, where the aim is to achieve a better color distribution of the pigment components in the recipe. In many cases, improved processing of the color pigments during pre-mixing can significantly reduce the quantity of this costly ingredient, which means that modern pre-mixing systems which can be individually configured are more economical than conventional mixers. Certain applications require particularly gentle handling and processing. Effect
pigments, for example, must not be processed or broken down mechanically, despite their fine, delicate structure. It is only possible to achieve an optimum solution to this challenge with specially adapted tool configurations. “A variety of requirements need to be taken into account when mixing color pigments. On the one hand, there is the important aspect of obtaining the best possible color output,” explains MIXACO Managing Director Matthias Tölle. “On the other hand, factors like productivity are also vitally important.”
Optimum Output and Better Productivity The quantitative output target of mixing is also influenced by a number of different parameters. First of all, there must be a constant supply of the right amount of pre- mixed product to ensure that the extruder always has enough raw material to process. Other essential aspects are the choice of optimum mixer sizes, minimization of mixing times and, above all, the reduction of unproductive downtimes e.g. for cleaning. “It’s important to look at the complete mixing process and take all individual steps into account as this is the only way to reduce downtimes and increase throughput,” explains Matthias Tölle. “That’s why, here at MIXACO, our attitude for many decades has been to define optimum mixing as not
The MIXACO container mixer Multitool is ideal for mixing of temperature-sensitive materials
just the supply of optimum mixers, but as a process that is integrated in a larger, coherent series of production workflows.” This approach has helped MIXACO to
establish an international reputation since the 1960s. The company’s reputation is built on a holistic attitude to the production process, taking into consideration not only the process engineering of mixing itself, but also the weighing, filling and in-house logistics of material on its way from the mixer to the extruder, including subsequent discharging. Here, too, MIXACO provides complete solutions in collaboration with internationally active plant construction companies and reputable extruder manufacturers.
Process Engineering Specialists For many years, MIXACO has been particularly active in the further development of process engineering in the industrial plastics compound sector. Theoretical assumptions have been empirically rejected or confirmed in the course of thousands of mixing trials, thus giving the company a broad, solid basis of experience and generating a wide variety of machine configurations for many different application challenges. The process engineering challenge
frequently results from the area of tension between three factors, namely the prevention
MIXACO Container Mixer Multitool
Neutral position
Mixing position
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