Drying and gas or vapor contact with solids – Apparatus – With means to treat gas or vapor
Patent
1987-05-28
1989-01-17
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
With means to treat gas or vapor
34 36, 34 40, 34 86, F28B 328
Patent
active
047980079
ABSTRACT:
An explosion-proof, pollution-free infrared dryer for concentrated vaporization and removal of combustible solvent from a newly coated product, such as a newly printed web of paper, having a pair of opposing infrared radiant heater or burner sources each contained within a combustion chamber having a radiation transmissive wall confronting the infrared source.
A drying tunnel for surrounding and passing the newly coated product or web therethrough is located in the ambient room air space between the infrared sources. The drying tunnel preferably is made of radiation transmissive panels to permit irradiation by the infrared source upon the web while yet containing and concentrating the vaporized combustible solvent.
A combustion inhibiting atmosphere (CIA) flows through the drying tunnel. The CIA cools the web and effectively removes the concentrated, vaporized combustible solvent from the drying tunnel away from the web and infrared sources preferably for reclamation in a CIA cooling and condensate collection system. Thereafter, the CIA may be recirculated within the drying tunnel.
The infrared dryer is appropriately provided with a hot air impact preheater for passing the web therethrough before its entrance into the drying tunnel. The preheater vaporizes a portion of the combustible solvent and improves the infrared absorption of the web as it next travels into the drying tunnel. The preheater may be efficiciently supplied with hot air from a heat exchanger receiving hot exchaust gases from the infrared heater sources.
REFERENCES:
patent: 3849063 (1974-11-01), Eichenlaub
patent: 4135098 (1979-01-01), Troue
patent: 4330946 (1982-05-01), Courneya
patent: 4336279 (1982-06-01), Metzger
patent: 4594795 (1986-06-01), Stephansen
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