PERFORATED DRUM OVENS

The operating principle in this oven is a combination of a perforated drum with a large centrifugal fan. The fan draws the air out of the drum interior, then it passes through the heating system (normally gas burner) and is forced back to the drum. This generates a vacuum within the drum on which surface the material is held. The material is traversed by a large volume of the hot air which ensures high heat transfer.

Due to the complete penetration of the air throughout the nonwoven product, these ovens are extremely efficient, and require reduced floor space. The drums diameter is optimized accordingly with the speed and the application, and they can vary from 1 to 7,5 meters with speeds up to 800 m\min.

There is also the possibility of adding more than one drum in line to achieve faster speeds.

When the felt is narrower than the width of the drum, two internal adjustable shutters stop the passage of air on the sides of the felt. This is to avoid loss of efficiency due to air flow that does not pass through the felt.

Typical applications: Asiuating needlepunched and impregnat felts, drying lightweight cotton or polyester spunlaced webs, thermfixing needlepunched felts for technical felts.