Powder spraying or scattering apparatus and method
First Claim
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1. A powder spraying or scattering apparatus comprising:
- material supply means for spraying or scattering a solid particulate powder material;
horizontal conveyor means disposed beneath said material supply means for supporting and conveying a substrate onto which the solid particulate powder material is to be sprayed or scattered at a predetermined position;
a flat disc member rotatable about a vertical axis and disposed below said material supply means and above said conveyor means and having an opening for passing therethrough the solid particulate powder material sprayed or scattered from said material supply means and applying the solid particulate powder material to said substrate at said predetermined position and a portion for blocking the passage of the solid particulate powder material;
scraper means disposed above and closely adjacent to said flat disc member in a position remote from said material supply means, said scraper means being effective to deflect said solid particulate powder material from the surface of said disc through said opening; and
a lower solid particulate powder material receiving member disposed beneath said scraper for collecting material deflected by said scraper through said opening.
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Abstract
Apparatus and method for spraying or scattering solid particulate powders onto a substrate includes powder spraying or scattering means, conveyor for supporting and conveying the substrate and rotatable disc member disposed between the spraying or scattering means and the conveyor which is spaced therefrom. The disc member is formed with at least an opening through which powders sprayed or scattered from the spraying or scattering means pass to reach the substrate on the conveyor. In operation, the disc member is rotated and the substrate is moved by the conveyor in the same direction.
150 Citations
8 Claims
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1. A powder spraying or scattering apparatus comprising:
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material supply means for spraying or scattering a solid particulate powder material; horizontal conveyor means disposed beneath said material supply means for supporting and conveying a substrate onto which the solid particulate powder material is to be sprayed or scattered at a predetermined position; a flat disc member rotatable about a vertical axis and disposed below said material supply means and above said conveyor means and having an opening for passing therethrough the solid particulate powder material sprayed or scattered from said material supply means and applying the solid particulate powder material to said substrate at said predetermined position and a portion for blocking the passage of the solid particulate powder material; scraper means disposed above and closely adjacent to said flat disc member in a position remote from said material supply means, said scraper means being effective to deflect said solid particulate powder material from the surface of said disc through said opening; and a lower solid particulate powder material receiving member disposed beneath said scraper for collecting material deflected by said scraper through said opening. - View Dependent Claims (2, 3, 4, 5)
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- 6. A method of applying a solid particulate powder material to a substrate comprising the steps of moving said substrate in a horizontal path, providing a material supply means for spraying or scattering a solid particulate powder material above said path, rotating a flat disc member about a vertical axis, said disc member being interposed between said material supply means and said substrate, discharging said solid particulate powder material through an opening of a predetermined profile formed in said flat rotatable disc member to form a solid particulate powder material pattern of a predetermined shape on the surface of said substrate, and changing the shape of said spray pattern by varying the ratio of the speed of rotation of said flat disc member and the speed of movement of said substrate.
Specification