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Homogeneously Coating A Surface With Powder

IP.com Disclosure Number: IPCOM000080982D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 69K

Publishing Venue

IBM

Related People

Bordt, H: AUTHOR [+3]

Abstract

This apparatus sprays powder contained in a supply bin onto a surface by two drums, which are equipped with bristles and which intermesh.

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Homogeneously Coating A Surface With Powder

This apparatus sprays powder contained in a supply bin onto a surface by two drums, which are equipped with bristles and which intermesh.

Supply bin 4, extending over the length of the two drums 1 and 2, has polished inner walls and perpendicular to its longitudinal axis a slightly funnel- shaped cross section. The supply bin 4 is open at its bottom end into which a segment of drum 1 protrudes. Drum 1 rotates in the arrow-marked sense, carrying powder 5 between its bristles to the point at which the two drums intermesh. The powder is expelled by the bristles of drum 2 if drum 2, in the arrow-marked sense, rotates at a higher speed than drum 1.

Powder 5 is deposited in a homogeneous layer 6 on the surface of substrate 7, provided that the substrate is moved slowly and uniformly underneath the apparatus. The coated area is governed by the length of the drums and the distance over which substrate 7 is moved during deposition. The density of powder layer 6 is a function of the rotating speed of drum 2. The thickness of the layer can be influenced by:
1) Repetitive coating;
2) Changing the distance between the axis of the drums 1 and 2

with the aid of adjusting means 3;
3) Varying the rotating speed of drum 1 and/or drum 2;
4) Varying the speed at which the substrate 7 is moved; and
5) Changing the length, the number, and the hardness of the

bristles.

The various parts of the apparatus, as far as this is possible, are made o...