US 4,116,163 AGranted

Apparatus to coat a flowing mass of particulate material

AssigneePeter Fahrni

InventorsAldo Torelli, Erwin Prinz

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Abstract

In the manufacture of chip board panels, the chip parts are sprayed with a bonding agent, and in the subject process, a curtain of chip particles of rotational symmetry relative to a vertical axis is first coated with the sprayable binder, after which the particles fall onto a generally horizontal rotating plate, whereby the particles are deflected and slung outwardly where the particles are again exposed to the effect of the spray jet. Thereafter, the particles are deflected downward for further treatment or collected and removed. The apparatus includes a circular particle delivery part for the formation of the rotationally symmetrical curtain, a spray device arranged within the curtain and concentric to it, and a rotating plate supported concentrically to the axis of the curtain particles and spaced away from the feed point of the particles. The assembly is disposed within an outer housing whereby after the particles are deflected and slung outwardly, and again passed through the spray jet, the particles are then deflected downwardly for further treatment or collection.

Claims10

Dependent claims

Apparatus for coating particulate material comprising:

a housing having means therein to establish a freely falling annular curtain of said particulate material;
a spray device disposed within said curtain and concentric thereto and effecting at least one jet of coating material directed against the inner side of the curtain whereby a first coating is applied to the particulate material and a remainder portion of the spray passes through the curtain;
a rotatable plate member supported concentrically to the axis of said curtain and disposed so as to intercept said annular curtain after the impringment thereon of said directed spray;
drive means rotating said plate so as to subject the intercepted particulate material to centrifugal forces whereby the intercepted particulate travels radially across the plate and is flung outwardly therefrom;
said housing being configured so as to deflect the outwardly flung particulate material and to guide the deflected material to discharge from said apparatus;
and
the directed spray portion passing through the curtain impinges on a portion of said plate lying outside of the curtain path whereby the intercepted particulate material moving radially across the plate due to said centrifugal forces is subjected to an additional coating operation.

4 more elements

Dependencies are inferred from the claim text.