Question 1

What products are suitable for a mesh belt dryer?

Accepted Answer

Mesh belt dryers are suitable for products that: can be spread on a belt without forming a solid mat that blocks air penetration (diced or sliced vegetables and fruit, pasta, pet food, grain, legumes); maintain their shape during the drying process (do not liquify or become excessively sticky at drying temperature); and do not have very high initial moisture that would require excessive drying time or very long belt length. Products that are difficult on belt dryers include: products with very high initial moisture (>85%) where pre-draining or pre-drying is needed; sticky products that adhere to the belt; and very fine powders that fall through the mesh. For liquid or high-moisture products, spray drying or other drying technologies are more appropriate.

Question 2

How does belt speed affect belt dryer output?

Accepted Answer

Belt speed controls the residence time of the product in the drying tunnel: a slow belt speed gives a longer drying time and produces drier product; a fast belt speed gives a shorter drying time and requires either a longer tunnel or produces product with higher final moisture. For a given product and drying temperature, the optimal belt speed for the target final moisture is determined during trials at commissioning. In production, belt speed is the primary control variable for adjusting the final moisture of the product — if the product exits too wet, slow the belt; if it exits too dry (over-dried), increase the belt speed. Operators should understand this relationship to avoid product waste from over-drying or quality failures from under-drying.

Industrial Food Belt Dryer Manufacturers

Industrial food belt dryers — design and operation

Industrial Food Belt Dryer Manufacturers

Industrial food belt dryers — design and operation

Frequently asked questions

What products are suitable for a mesh belt dryer?

How does belt speed affect belt dryer output?

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