Abstract: An accelerator member—in the form of a guide member and in particular in the form of an impact member—is strengthened by a strengthening member (110), which strengthening member is provided with a least one attachment side (120). The accelerator block (111) is provided with a least one attachment surface (355). The various aspects being arranged such that at least part of the attachment side of the strengthening member is firmly joined to at least part of the attachment surface of the accelerator block. The strengthening member is made of a structural material that has an appreciably greater tensile strength than the structural material from which the accelerator block is made.

Abstract: The invention relates to a method for directly and multiply making material collide in an essentially deterministic manner, the material being guided by a rotating guide member, from a central feed, along a guide face and to a delivery end, in such a manner, that the material leaves the guide member, from an essentially predetermined take-off location, at an essentially predetermined take-off angle and at a take-off velocity which can be selected with the aid of the angular velocity, with the instantaneous angle (.theta.