Process for the continuous drying of water-surrounded granulate
A process for the continuous drying of water-surrounded granulate transported by a screen-type belt conveyor. In a first conveying region in the form of a chute, water is withdrawn under gravity from the plastic granulate at a temperature of > than 100° C., wherein, in a following second region on a belt conveyor, any remaining water is substantially removed by air extraction through the belt conveyor, the air extraction taking place at an air speed of > than 20 m per second and with a dwell time in the second region of < than 2 seconds, there being a following third region, as an evaporation zone, with a dwell time of more than two seconds.
1. Process for continuous drying of water-surrounded plastic granulate transported by a screen-type belt conveyor ( 4 , 10 ), comprising the following steps:
withdrawing water in a first conveying region in the form of a chute, water is withdrawn under gravity from a plastic granulate at a temperature of > than 100° C.;
extracting in a following second region on a belt conveyor ( 4 ), any remaining water wherein the water is substantially removed by air extraction ( 8 ) through the belt conveyor ( 4 ), the air extraction taking place at an air speed of > than 20 m per second and with a dwell time in the second region of < than 2 seconds; and
evaporating in a third region ( 6 , 9 ), as an evaporation zone, with a dwell time of more than 2 seconds.
2. Process according to claim 1 , characterized in that the plastic granulate is distributed in a single layer for transport on the belt conveyor.
3. Process according to claim 2 , characterized in that the air speed in the second region is greater than 30 m per second.
4. Process according to claim 2 , characterized in that the temperature of the plastic granulate in the first region is greater than 120° C.
5. Process according to claim 1 , characterized in that the air speed in the second region is greater than 30 m per second.
6. Process according to claim 5 , characterized in that the temperature of the plastic granulate in the first region is greater than 120° C.
7. Process according to claim 1 , characterized in that the temperature of the plastic granulate in the first region is greater than 120° C.
8. Process according to claim 1 , characterized in that the plastic granulate is provided with abrasive fillers or strengtheners.
9. Process according to claim 1 , characterized in that the plastic granulate has a friction-sensitive surface.
10. Process according to claim 1 , characterized in that the plastic granulate consists of a brittle material.