Dryers for food applications are generally provided with vapour canopies and extract systems to remove the vapours from the operating area. Dryers for hazardous materials may be provided with complete dust and fume tight enclosures whilst heat sensitive products may require full vacuum casings. For double or twin cylinder drum dryers the drive is provided by means of spur pinion and gear wheels mounted on the dryer drum drive end trunions. In the case of drum dryers with multi feed or applicator rolls, each applicator roll is rotated by a pinion driven by the drive spur gear wheel. In the case of drum dryers with simple applicator rolls the applicator roll is often driven by a completely separate drive train.
All drives are variable speed, type and configuration to suit each particular application.