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 Gneuss mejora su gama de sistemas de filtración de fundidos para materiales altamente corrosivos

High resistance to corrosion

Gneuss improves its range of filtration of cast for highly corrosive materials systems

Gneuss Kunstofftechnik18/05/2009

May 18, 2009

gneuss kunststofftechnik has enhanced its range of filtration systems Rotary pressure and constant process for SFXmagnus and RSFgenius for plates of foam insulation used in the construction industry. Thanks to a special surface treatment and its design encapsulated in full, the corrosion resistance has been increased.

"Manufacturers of products from sheet espumada for trays and cups, and plates of foam multi-purpose insulation were convinced by the decisive advantages of our filtration systems from the very outset", explained sources of Gneuss company. For more than 20 years, rotating Gneuss filtration systems have won the full in this industry acceptance because in addition to the reliable filtration of foreign particles, the constant pressure operation also ensures an absolutely constant structure of foam in the final product. This constant structure of foam is an important advantage in the processes behind the filter. The manufacture of the plates of insulation foam (XPS) for the construction sector is also an interesting for these high-end systems use. However, in contrast to other processes of the foam, there is in this case application, corrosion caused by the retarders of the flame, which adds specific requirements in the design of filter changers.

Thanks to its better mechanical characteristics and isolation, XPS insulation boards are used increasingly in the construction sector as a replacement for the EPS plates. XPS boards are usually manufactured in two extrusion machines installed one behind the other. The primary extruder mainly plasticised material and disperses the additives and the blowing agent while the secondary extruder efficiently cool the material. In this configuration the location of the filtration system of the mass cast in the transfer between the primary extruder and the secondary section has been tested as the best location for this application.

Due to the specific process of foam, the changed filter must satisfy various requirements at the same time:

The success of the molten mass of Gneuss filtration systems is largely due to its process and constant pressure operation.

· Despite the low viscosity of the blend polymer / agent of foam and pressure from the molten mass of up to 300 bar at the start of the primary extruder, the filtration system should operate free of losses.

· Fully automatic operation and avoid errors of operation is as important as the continuous constant pressure of molten mass, even during the change of the filter elements to ensure that changes do not occur in the structure of the foam.

· Short residence times are essential to prevent the activation of the retarders of flame, which are added to the mass of the polymer to comply with the standards of the construction industry.

Filtration system SFXmagnus in a line of isolation of PS plates.

Both, well known, filtration systems for plastics, SFXmagnus and RSFgenius, with its constant operation of the pressure and the process, ensure the withdrawal of foreign particles from the molten mass without negatively influencing the sensitive process of the foam. In addition, the RSFgenius ensures lasting changes of filters for several months (even in the highly contaminated material) thanks to its integrated limpiante auto.

Gneuss can now offer this system with a longer term of protection against corrosion thanks to a special treatment against corrosion of the steel used for the manufacture of filter changers. In this sense all the advantages of Rotary filtration systems are available for the construction industry providers. Even when material highly corrosive are prosecuted.

In Russia, for example, in a market with strong demand for plates of foam for insulation, 14 filtration systems have been installed only in this market segment in recent years.

The success of the molten mass of Gneuss filtration systems is largely due to its operation process and constant pressure, ensuring the producer a constant operation, which ensures a quality of the uniform product with a high level of automation to the manufacturer. These advantages are particularly important when using recycled materials, this is due to the increasing cost.

In many cases highly flammable gases are used as an agent of foamed: Gneuss filtration systems offer another advantage compared to conventional systems. Gneuss systems there is no sudden or uncontrolled espumados of the material and therefore there is no sudden losses of gas during the filter change. This provides greater in the operation of the equipment safety.