German plastics group reports on sales
BAD HOMBURG, GERMANY Despite a drastic collapse in the first quarter of 2009, the German plastics industry's umbrella trade group says there already are signs of the business situation brightening.
Bad Homburg-based Wirtschaftsvereinigung Kunststoff (WVK), which starting this month represents German machinery and materials suppliers and processors, said plastics materials producers suffered a 35.5 percent decline in sales in the first quarter of 2009, compared to the German plastics processors' sales that were down 19.8 percent in the same period, mostly the result of reduced exports. Their domestic sales were down 17.2 percent.
German plastics and rubber machinery producers experienced a 27 percent decline in sales.
Reinhard Proske, WVK President, rated the drastic declines as a historically crucial event in the plastics industry that has been growing for decades. Nevertheless, he sees no reason to be gloomy in the long term.
Priamus enhancing hot-runner molding
CHICAGO At NPE2009, Priamus System Technologies LLC (Booth N87010) is focusing on products to control and analyze hot-runner molding.
Priamus said a hot runner control, by itself, is not able to detect the sensitivity of the individual nozzles, since a closed-loop control is lacking. For that reason, Priamus has added an analysis tool that automatically determines the sensitivity of each nozzle, to the Priamus Fill hot runner balancing and control system. Temperature sensors in the cavity check how the flow behavior of the melt changes when the individual nozzle temperatures have been increased or decreased by a certain value.
The control shows at a glance to what extent the individual nozzles sensitivities differ and indicates a conclusion of the limits of each hot runner.
Also at NPE2009, the company is showing Priamus Fill with automatic shutoff nozzle control, for use in hot runners where an adjustment of the nozzle temperatures is not an efficient way to get a balanced mold-cavity condition. Priamus has added a control algorithm that compensates the different flow behavior of the individual cavities by automatically adjusting the delay time to open the nozzles. This new procedure, for example, allows balancing and control of liquid silicone rubber.
EDI's flat-die coating reduces corrosion
CHICAGO Extrusion Dies Industries LLC (Booth N85007) has a new surface coating for flat dies that withstands most attacks from corrosive hydrochloric acid generated during the extrusion of PVC. Thermal degradation of PVC caused by heat and shear during extrusion generates the corrosive gas that can cause extensive damage to dies with conventional surfaces.
DuraCoat is inert when exposed to harsh chemicals, according to Gary Oliver, EDI vice president of technology. Although recommended for PVC foam, film and sheet, EDI is exploring possible uses with other corrosive plastics.
The new coating forms an extremely thin film on the steel surface of the die that has no effect on even the most intricate features machined into flow surfaces, Oliver said in a news release. Slip release compares with standard chrome plating. The coating exhibits high hardness, very high melting and oxidation temperatures and insolubility in most acids and bases.
EDI also said its dies are used for precise coating and film layers within high-efficiency lithium-ion batteries. The multilayer structures in the batteries generate electrical power and are designed to perform for thousands of charging cycles.
Buss AG highlights its improved kneader
CHICAGO Buss AG (Booth N83039) has advanced its four-flight Quantec Kneader, making it possible to compound rigid PVC with up to 100 parts per hundred resin.
The improved kneader's process zone has been extended to a 15-to-1 length-to-diameter ratio. A downstream vertical intake screw has been added for feeding fillers directly into the gelled PVC melt. Both these expanded intakes have a larger housing and screw diameter, allowing the biggest possible fillers take-up volume in the process zone.
Trials have shown the Quantec has throughputs as high as 858 pounds per hour at fillings of 100 pounds per hundred resin of calcium carbonate.
Buss of Pratteln, Switzerland, notes its four-flight Buss MX Kneader is successful in applications beyond cable compounds. The new applications cover most high-fill temperature- and shear-sensitive compounds. For the same machine size, throughput of these kneaders is 21/2 times that of previous models. Buss is displaying an MX Kneader at NPE2009.
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