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Method and apparatus for the spraying of powder

  • US 4,659,011 A
  • Filed: 04/03/1981
  • Issued: 04/21/1987
  • Est. Priority Date: 04/12/1980
  • Status: Expired due to Fees
First Claim
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1. A method for spraying powder, said method comprising the steps of:

  • conveying to a spray device a stream of powder to be sprayed;

    introducing a spray gas into said stream at said spray device to form the powder emerging therefrom into a spray cloud; and

    injecting an additional gas into said stream with a tangential and with an axial downstream component of velocity, at a point between about 5 cm. and about 30 cm. upstream of the point where said spray gas is introduced, in such a manner as to cause the concentration of said powder to increase as a function of radial distance in said stream from the axis thereof and to retain this radially unequal distribution of powder from a point where said additional gas is introduced down to a point where said spray gas is introduced.

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