×

Method of recovering paint booth filters

  • US 5,976,225 A
  • Filed: 06/07/1997
  • Issued: 11/02/1999
  • Est. Priority Date: 06/07/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method of reducing the waste stream from an industrial paint booth having an inflow of clean air and an outflow of exhaust air containing paint overspray which comprises:

  • providing sufficient filters in the paint booth to substantially remove the paint overspray particles carried in the exhaust air stream from the paint spray booth, said filters being of a construction capable of repeatedly withstanding temperatures up to at least about 540°

    C.;

    further providing a bake-off oven having a primary heating chamber and a secondary combustion afterburner;

    removing the filters when loaded with captured paint overspray particles from the paint spray booth and placing them in the primary heating chamber of the bakeoff oven;

    heating the overspray loaded filters in the primary heating chamber of the oven for a first preselected time period at an initial temperature which does not exceed about 260°

    C. and then for a second preselected time period at a higher temperature which does not exceed about 343°

    C. in order to drive off volatile materials and burn off combustible components of the entrapped paint overspray particles so as to leave only exhaust gases and a residual ash on the filters;

    directing the exhaust gases from the primary heating chamber into a secondary afterburner at a temperature of at least about 760°

    C. to ensure essentially complete oxidation of any volatilized organic components in said gases;

    removing any remaining residual ash from the filters; and

    returning the cleaned filters for reuse in the paint spray booth, whereby the only waste stream for subsequent disposal is the removed ash.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×