Advantages of 2H-packings

At the end of the eighties, 2H developed a method for the manufacture of embossed foils. This patented process makes foil extrusion possible (incl. embossing) directly from the molten mass. Thanks to this process, which we apply to the processing of PP and PVC, the customer receives a number of benefits:

 

Optimised foil thickness distribution:



Foils are reinforced both at the outer edges as well as in the middle by approx. 50%, i.e. at places that have been defined beforehand, the foil is extruded thicker than at other places. Thanks to this optimised foil thickness distribution, we achieve a unique stability at the top and bottom edge of the block (both at a block height of 300 mm and 600 mm). With that, an extraordinarily high resistance is achieved against the danger of erosion (pitting) caused by the constant admission of water. Our PP packings that consist of a PP compound developed by us, have a particularly high strength and erosion resistance.

 

Deformation behaviour (memory effect)

During conventional methods for the manufacture of embossed foils for packings, a flat foil that has been prior extruded is subsequently heated and then formed (e.g. by deep-drawing). The severe deformation during this process causes stresses inside the foil. These stresses become obvious during renewed heating when the foil shows a tendency to return to the shape of a flat foil. This is called the memory effect. During malfunctions in the cooling tower operation or even during storage in blazing sunlight (e.g. during the installation phase), temperatures may occur that can trigger this memory effect and cause a deformation of the packings and therefore also a reduction of the refrigerating capacity. These problems are unknown with the 2H-production method, as our foils are formed directly from the molten mass so that they are absolutely free of any stresses. The customer will, therefore, receive a product that will retain its shape both during the installation phase and during its operating life.

Temperature resistance

Malfunctions in the cooling circuit may lead to hot water coming in contact with the packings. Furthermore, there are numerous applications during which higher water temperatures may occur. In their standard design, our PP-packings resist operating temperatures of up to 80ºC (short-term) without any deformations. At operating temperatures exceeding 80ºC (long-term), it is possible for us to use a PP-compound that has been specifically adapted to this purpose so that even under these extreme conditions (short-term up to 120ºC), our packings can be used without any problems. PVC-packings are restricted in their temperature resistance and the operating temperature should not exceed 60ºC (short-term). At a permanent water temperature of 60ºC or more, there is a danger that an extreme deformation of the packings will occur.

Bonding technique

The welding method that has been specifically developed by 2H makes it possible to completely do without glue. By our method, the foils are heat fused together. Depending on the type of packing, up to 20.000 welding spots per m³ guarantee an excellent bonding of the foils absolutely without any solvents! This is not only a contribution to environmental protection, but doing without glue also avoids the creation of any points susceptible to hydrolysis, which could fracture the contact points.
The strength of our bonding method (load-bearing capacity up to 30,000 kg/m²) has been confirmed in long-term tests carried out by accredited testing laboratories (inter alia TÜV, the German Technical Inspection Agency).

Advantages of the 2H-packings made of polypropylene (with 2H PP-compound)

Today, polypropylene is the material most frequently used to substitute PVC. For the area of application ‘special applications’ it offers some considerable advantages over PVC:

  • the improved temperature resistance (standard design short-term up to 80ºC, special design long-term up to 100ºC) offers safety during malfunctions and allows a wide range of applications;
  • low tendency to embrittle and thus considerably more erosion-resistant (no pitting)
  • small danger of damage to the packings during the installation phase due to the raw material properties of PP (tough material)
  • excellent UV-stability
  • thanks to the lower density of PP compared to PVC, it is possible to achieve a higher wall thickness at equal weight per m³ which results in a super proportional increase in the stability of the packing
  • in many areas, it is more resistant to chemicals than PVC
  • free of halogen and heavy metals and thus less ecologically harmful
  • 2H PP-products have been approved for drinking water applications - production on request
  • simple, trouble-free disposal (see publication of EU-Commission; Download: http://europe.eu.int/comm/environment/pvc/contributions/3greenpeace.pdf)


2H polypropylene (PP) packings offer a high-quality alternative to the PVC packings currently available on the market at an absolutely competitive price. The customer receives a product that, after years of use, still displays the same positive properties as when it was new.

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