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Twin Screw Extruder Friction Heat
- Aug 27, 2017 -

Twin Screw Extruder Friction heat

In most extruders, the change in screw speed is achieved by adjusting the motor speed, which drives the motor at a full speed of about 1750 rpm, which is too fast for an extruder screw. If such a fast speed of rotation, it will produce too much friction heat, it will be because the plastic retention time is too short and can not prepare a uniform, very good mixing of the melt. The typical reduction ratio should be between 10: 1 and 20: 1, the first stage can be either a gear or a pulley block, but the second stage is preferably a gear and the screw is positioned at the center of the last large gear. For some slow-running machines (such as twin screws for UPVC), there may be three deceleration phases, with maximum speeds as low as 30 rpm or less (60: 1). On the other hand, some very long twin screws for agitation can run at 600 rpm or faster, thus requiring a very low deceleration rate and more deep cooling. If the deceleration rate and work with a mistake, there will be too much energy to be wasted. It may be necessary to add a pulley block between the motor and the first deceleration phase that changes the maximum speed, either increasing the screw speed even beyond the previous limit or reducing the maximum speed. This increases the available energy, reduces the current value and avoids the motor fault. In both cases, the output may increase due to the material and its cooling needs. 1, wear situation:

Due to the convenience of opening, it is possible to find the degree of wear of the threaded element and the inner sleeve of the barrel at any time, so as to carry out effective maintenance or replacement. And will not be found in the extrusion product problems, resulting in unnecessary waste.

2, reduce production costs:

When the masterbatch is made, it is often necessary to change the color. If it is necessary to replace the product, open the open processing area in a few minutes, and the mixing process can also be analyzed by observing the melt profile on the entire screw. At present, ordinary twin-screw extruder in the replacement of color, you need to use a lot of clear machine for cleaning machines, both time-consuming, electricity, and waste of raw materials. The split-type twin-screw extruder can solve this problem, change the color, as long as a few minutes can quickly open the barrel, the manual cleaning, so you can use or less cleaning materials, saving costs.

3, to improve labor efficiency:

In the equipment maintenance, the ordinary twin-screw extruder often first to heat, cooling system removed, and then the overall withdrawal of the screw. And split-type twin-screw is not used, as long as the release of a few bolts, turn the worm box handle device lift the upper part of the barrel to open the entire barrel, and then repair. This shortens the maintenance time and reduces the labor intensity.