Extreme Feedscrew Coatings Private Limited

2008年11月极端的涂层s began operation of a coating facility in Bangalore, India. With this, Extreme Feedscrew Coatings Pvt. Ltd. offers the same great long lasting tungsten carbide FliteGuard and full encapsulation options to processors through out Asia.

We encapsulate screws to make them last longer. Our technology doubles the life of any feed screw. Our tungsten carbide is more than three times more wear resistant than the next best material tested. These test results give us the confidence to guarantee AT LEAST double the wear life of our carbide encapsulation over your current feed screw Our Rebuild Certificate states that we will return your feed screw to its pre-encapsulation condition if you are not completely satisfied with the screw performance. It has been determined in lab testing that a doubling of feed screw/barrel clearance may reduce the output of an extruder by as much as 20-25% in low viscosity resins and 10-13% in higher viscosity resins. Furthermore, as the outside diameter of the screw wears, the flight to barrel scraping or wiping action decreases which, with some polymers, leaves a thin residue of molten plastic on barrel that may burn or retard thermal conductivity. Additionally, back flow increases potentially causing excess shear and subsequent polymer degradation. Scrap or reject rates may increase, but more importantly, the physical properties of the polymer may be jeopardized. Even a small percentage of abrasive filler may cause unacceptable wear to occur 3-4 times quicker. Processing non-abrasive polymers such as clear LDPE have little to no effect on screw wear, but for those running 24-7, adhesive wear will be obvious in as little as 2 years.

Encapsulation to an injection molder: Maintaining a tight tolerance between the feed screw and barrel in a plastic injection molding machine is of vital importance to the production efficiency of the machine and the quality of the parts being produced. The principles of plasticizing in an injection molding machine are almost identical to those of an extruder. The main difference is that the injection screw is extruding plastic into the barrel to create a shot rather than through a die to form a product. As this is the case, wear on the O.D. of the screw may be observable as an increase in the feed screw recovery time or maybe even the cycle time. In applications where the cycle time maybe much greater than the recovery time, it may be misinterpreted to be acceptable to continue with production if the cycle time is not affected. In contradiction, an increase in residence time may cause polymer degradation or burning. In the case of glass filled resins, back flow may cause excessive shear affecting the integrity of the fibers. Both, if not held to a minimum, will adversely affect the physical properties of an engineered polymer. Further to this, especially in the case of low viscosity resins without a new check ring, it may be difficult to hold a cushion and short shots may be evident. With respect to machinery down-time, one can expect an encapsulated feed screw to last at least twice as long as any feed screw on the market today, even CPM9V* tool steel, thus, eliminating the time associated with numerous maintenance inspections.