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Fillers on the mixing equipment to reduce the wear and corrosion

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In the mixing process, in order to reduce costs, many films, sheets, profiles and pipe manufacturers will more and more mineral filler material added to its formula. However, too much filler on the mixing equipment may cause serious wear and corrosion. How to solve this problem? For mixing processors, increasing the filler content is a new challenge. If the screw and barrel wear and corrosion of the fill material will directly affect the normal operation of equipment, production efficiency and product quality. In the NPE 2006 show, fill the wear and corrosion problems have been a lot of attention. The show appeared in many innovative techniques to maximize the protection of the important parts of mixing equipment. Fill in the film PE film processors will generally be 10% to 15% of the calcium carbonate added to the formula, and some recycled films (such as garbage bags, etc.) minerals are likely to add up to 65%. Now, many film makers (of different filler content) would like to add more calcium carbonate. When the addition of 10%, the calcium carbonate material will affect the impact strength. However, when the addition level of 10% to 25%, the material impact strength will be increased by 1 fold, while the tensile strength decreased. When the addition of 25% or more, the impact strength decreased, but the rigidity higher, can reduce the film thickness. In addition, calcium carbonate can make the film more uniform size. Farrel, President Alberto Shaio said the main problem is that people try to add a single screw extruder grade filler. And this does not make a better filler dispersion. If the output is large enough, a solution is mixed in a higher grade spiral tank filler. Farrel recently as two plastic film processors to provide a twin-screw compounding machine to the LLDPE / LDPE masterbatch in calcium carbonate content from 65% to 75%. According to reports, a 10% increase in the products of the filler, resin cost annual savings of 100 million, fully able to recover the equipment costs. The film wastes Erema TVE system has been re-granulation has been applied in the European market, added to the film in the recovery of 20% to 50% of the calcium carbonate. Before entering the extruder packing after shredding, compaction, warm, mixed. It is said that the system can reduce the cost of film grain materials, and improve product performance. More rigid barrel plating Two vendors introduced a new twin-screw extruder barrel coatings to meet the high resistance to wear and corrosion resistance requirements. These coatings by the thermal equilibrium pressure (HIP) powder metallurgy steel. Century Extrusion has introduced a nickel - the matrix of boron carbide with 65% of the new HIP coating. Coperion has launched ProtectExtreme HIP coating, a mixture of spherical nickel boride and carbide powder alloy (NiCrBSi). The coating in the barrel on the thickness of 3mm, the thickness of the top barrel 4mm. Meanwhile, in Coperion has developed after 16 years, Conforma Clad began selling three of its original brazing metal barrel plating. Conforma Clad's WC200 (and the corresponding Coperion the WPR 29) Three metal coating containing 68% tungsten carbide, between the top of the barrel contains 62% tungsten carbide. The new concept of mixed Coperion has prepared over the last 25 years, a remarkable process technology commercialization. Developed by the Stratek Plastics This patented technology is known as Tek-Flow, is currently in experimental stage. Tek-Flow Coperion will expand to achieve commercial application equipment. Extension of this technique using vibration and current release plastic chain, made in the aggregate under low viscosity is said to be able to produce films at low temperature and low pressure, or other thin-walled injection molding products. This effect is temporary, do not add any additives can be successfully completed, thus changing the molecular weight distribution and balance to meet all performance. Re-melt the plastic back to a previous entanglement. It is said that this technology can thermal mixing more additives, and improve the performance of recycled plastics.
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