Continuing in the spirit of the very vague question I would like to ask what granular material you would like to be considered.

Maize used to be fed into rolls which had slightly different rotational speeds so that the seed was stretched as it was crushed. This produced the feed for cornflakes which become quite a large quantity in their own right. (Scource: Renolds News 1978)

Peanuts are shelled in a variant of a tooth roll crusher with air elution but without the air current it could be used to crush limestone, temporarily.

In other words: please be a lot more specific with your quest. This is really a process matter, but fascinating all the same. ■

Probably, Mr. Mittya is referring to the deterioration of cereals, caused by the various types of bulk handling equipment.

F.i. , it is a well-known fact that the pneumatic conveying of whole grain rice or bird seeds can have unwanted effects on the quality of the commodity.

After pneumatic conveying the whole grain rice can become broken rice, which has a significant effect after cooking.

Bird seeds of which the husk is removed by the handling equipment makes the birds rejecting the food.

The friability of a product determines the way of handling, whereby the grab seems to be the most gentle way of transshipment in combination with a conveyor belt.

(Screws and chain conveyors do damage the product as well)

The question remains: is it a process- or a handling issue? ■