Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1990-09-28
1992-02-11
Bennett, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 60, F26B 334
Patent
active
050865706
ABSTRACT:
An improved drying apparatus for screen process printing and coating, using water-based inks and coatings, whereby a novel combination of a forced hot air dryer and radio frequency dryer is provided. The principal advantages of the present invention as compared to the prior art reside in the significant savings in floor space requirements and power requirements for high produciton (i.e., 2,000-3,000 impression per hour) screen process printing and coating operations which have heretofore utilized a 40 foot length hot air drying apparatus which suffers from a number of disadvantages as previously described. The RF dryer and hot air dryer portions of the present invention are serially arranged on a common conveyer belt apparatus and may be combined with an optional air conditioning cooler which is positioned on the output side of the radio frequency dryer for cooling the cured ink or coating material as it exits from the radio frequency dryer. The radio frequency dryer portion of the preferred embodiment of the present invention, operates at about 27 MHz. generating at least 12 kilowatts of radio frequency output power on an input power of 22 kilowatts maximum. The hot air dryer used with the present invention, because of the significant amount of drying induced by the radio frequency dryer thereof, may be substantially smaller and operate at a substantially lower temperature than the conventional hot air dryer used in the prior art and which provides the entire curing effect of such prior art systems.
REFERENCES:
patent: 4296555 (1981-10-01), Preston
patent: 4359826 (1982-11-01), Rounsley
patent: 4501072 (1985-02-01), Jacobi, Jr. et al.
Bennett Henry A.
Gromada Denise L. F.
Screen Printing Enterprises, Inc.
Tachner Leonard
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