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6 FAQs about [Screw wear tutorial]
What causes a screw to wear?
Processors and suppliers commonly theorize that wear in these areas is caused by metal-to-metal contact between the flight OD and barrel ID, due to screw flexion under these high pressures. This theory is unlikely because the internal pressure is generally the same all around the screw.
What happens if a screw is worn?
An example on this chart shows that a 3.5” screw with .020” wear will cause an average production loss of 9% on an average production process. When a screw is worn, it also generates an increase in the melt temperature of the polymer being processed.
Where does screw thread wear occur?
Wear can occur in all parts of the screw, but it usually tends to be greatest where the pressures involved are greatest and thus in the transition and dosing zones. Another consequence of screw thread wear is an increase in polymer temperatures.
Does screw wear affect performance?
PERFORMANCE ISSUES Screw wear is generally a slow process that can go unnoticed until performance is greatly reduced. Minor wear will have little effect on overall performance, as machine parameters can be adjusted to maintain productivity. When the radial clearance between the screw flights and barrel wall increases, leakage flow is inevitable.
What happens if a screw is worn in an extruder?
The first consequence of wear that can be observed is the reduction of the maximum flow rate that can be processed by the extruder. The screw, which is designed to rotate within the barrel, has a thread diameter slightly smaller than the barrel diameter to allow free rotation of the screw.
How do you measure a screw?
Using dial calipers, measure the root diameter of the screw (as shown in Figure 7) at every turn of the screw over its entire length. When measuring the root of the screw (starting in the feed section and measuring towards the nose end of the screw) the root diameter will measure very close in diameter, turn to turn (within +/- .010”).