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This news article was originally written in Spanish. It has been automatically translated for your convenience. Reasonable efforts have been made to provide an accurate translation, however, no automated translation is perfect nor is it intended to replace a human translator. The original article in Spanish can be viewed at Mezcladores estáticos para aplicaciones de extrusión e inyección

Obtain a proper mixture

Static mixers for extrusion and injection applications

Drafting PU15/03/2003

A perfectly homogeneous mass is a prerequisite to obtain pieces of high-quality, constantly. With the help of the mixer static Sulzer, company represented in Spain by Helmut Roegele, the quality of the mass can be optimized with a minimum of effort. A system mixer, specially designed for application in extrusion and injection processes, can easily be installed on the current machine.

Static mix means homogenization without the use of moving parts. The effect of mixture is based on the continued Division, extension and implementation of components. The differences in concentration, temperature and speed are matched through the section to the passage of the mass by the mixer. The power unit, or spindle pump, provides the energy needed to make the mixture. The low strength of the shear and operation without maintenance guarantee of Sulzer Chemtech mixers are ideal for applications in the process of polymer industry.

In the injection moulding, problems such as the formation of bursts of color are often resolved by modifying the parameters of the machine. Many processors spend a considerable amount of time and effort by adjusting their processes in order to produce acceptable pieces in the shortest possible time. In the manufacture of parts with color, the problems of stretch marks that cannot be resolved by modifying parameters of the machine, often are arranged to increase the concentration of the dye, which inevitably entails an increase in the cost of production.

Less dye

Many companies have succeeded in reducing the consumption of coloring up by 40 percent using a Sulzer SMK-R mixer. Uniform distribution guarantees obtaining color with values comparable to using much lower concentrations. This ensures repayment of the mixer in a very short time.

The homogeneity of temperature in the mass ensures a filled uniform of the mold which improves the dimensional accuracy of the piece as well as the consistency in the finishing of the surface - for example, the brightness. Obtain a uniform temperature of the material in the mouthpiece has allowed to reduce the cycle time. Using a Sulzer mixer can be perfect pieces even when difficult material or material reprocesados using universal spindles for general applications are processed.

One of the most common methods to improve the plasticizing process, is to increase the back-pressure. However, this has a negative influence on the life of the spindle and generally produces an excessive shear and a rise in temperature that alters the properties of the polymer. With the installation of a Sulzer mixer we avoid excessive use of back-pressure to protect both the material and unnecessary stress plasticizing unit.

There are Sulzer mixers available for all sizes of machines that produce from micro parts of less than a gram of weight from more than 30 kg. For a quick and easy installation, Sulzer also supplies complete sets composed of nozzle and mixer. The SIB nozzle is supplied with the mixer, band heating and thermocouple, ready for mounting and machined with the specifications of the user. The conversion work is reduced to brief change of the existing mouthpiece by the SIB mouthpiece of Sulzer. In addition, nozzles with integrated filter to protect against obstructions hot channels for impurities or foreign bodies can be supplied.

Extrusion

The SMB-R mixer homogenizes the mass before going into the matrix. The resulting uniformity, both temperature and velocity of the mass, substantially improves the accuracy of the extruded piece. There is also a considerable reduction in stress retained over the cooling that can cause alabeos or curvatures. Contrary to the dynamic mixers, the friction exerted on the polymer by the (static) mixer, particularly low so the extruder is exempt from further efforts and avoid uncontrolled overheating.

Sulzer Chemtech also offers systems complete mixers with casing, upon request, ready to be installed on the production line with connections, heaters, thermocouple and coupling according to customer specifications.

The mixers can also be integrated into other processes of transformation of polymers. For example mixer SMB-H is applied with success in the process of extrusion blow molding of hollow bodies and cable extrusion. In systems of hot channel, distribution of temperature and velocity of the mass, substantially improved with the installation of adequate mixers.

Related Companies or Entities

Roegele, S.A.

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