Fluid handling – With cleaner – lubrication added to fluid or liquid sealing... – Cleaning or steam sterilizing
Reexamination Certificate
1997-07-29
2001-05-08
Walton, George L. (Department: 3753)
Fluid handling
With cleaner, lubrication added to fluid or liquid sealing...
Cleaning or steam sterilizing
C134S095100, C134S098100, C134S102100, C134S16600C, C134S171000, C222S148000, C239S112000
Reexamination Certificate
active
06227228
ABSTRACT:
BACKGROUND OF THE INVENTION
Modern hydro-softfeel lacquers have special characteristics which make the use of plural component mixing equipment difficult. In particular, the solvent which is required to be used on the catalyst side of the mixing equipment is incompatible with the resin.
The general mixing process for the instant invention is set forth in European Patent EP0116879 in that portions of resin and catalyst are sequentially dosed into an integrator tube where some homogenization takes place and the premixed material is then finally homogenized in a static mixer. This procedure is continuously repeated thus providing a continuous mixed material from the sequential dosing system. Currently, such systems are sold by the assignee of the instant invention under the trademark PRECISIONMIX.
SUMMARY OF THE INVENTION
To solve the problem with the hydro-softfeel lacquer, a n additional valve is installed in the mixing block of the resin side, that is the single purge valve previously used on the resin side is replaced by an adapter block which has two valves so that the two separate purge materials can be flushed into the outer tube of the integrator and one purge material used on the inner tube.
During production, only the mixed material is purged and the catalyst will remain in the inner tube. This is performed by using two resin purge valves which inject water and air at intervals into the integrator tube mix chamber. This mixture is then flushed via the hose and gun.
When the purge process is terminated the mix program is restarted. This process is used for color change, however at the end of production or substantial periods of interruption of production, the catalyst too then must be flushed. To do so, the process set forth above is initially applied and when the integrator tube is completely free of mixed material and resin, the purge valve on the catalyst side opens and the catalyst is flushed with solvent.
Because the resin and solvent are completely incompatible, it is necessary to make sure that the solvent has been flushed completely out of the integrator tube and the mixed material line before starting the mix process. Therefore the catalyst valve is opened for a certain time sufficient to replace the solvent in the integrator with catalyst before the initial purge process described above for color change is again initially applied to flush the solvent out of the mixed material line.
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Farrow Douglas B.
Graco Minnesota Inc.
Walton George L.
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