Method for the manufacture of liquid-impermeable, flexible bands

Details Method for the manufacture of liquid-impermeable, flexible bands Method for the manufacture of liquid-impermeable, flexible bands

1990-07-20

1992-07-21

Lusignan, Michael

Coating processes

With stretching or tensioning

4273898, 156137, 156242, B05D 312

Patent

active

051321416

ABSTRACT:
The invention relates to a method for the manufacture of impermeable, flexible, elastical bands having a smooth inner surface and consisting of a plastic fabric, including spiral bands and mats of threads, which bands are especially suited for use in connection with an extended nip of wet presses of paper making machines. These bands are used as press bands or press coates and are manufactured by applying a mixture of a prepolymer, especially polyurethane, in a flowable consistence to an endless fabric band and joining that mixture thereto, which band is transported over a reverting roll device and is coated by means of at least one nozzle on its outer surface with the flowable prepolymer mixture. In order to improve the known method which is provided with drawbacks the invention proposes to spread over the at least parallel and distantly arranged rolls of the roll device an elastic carrier band having a smooth upper surface onto which the fabric band which is to be coated is tensioned in such a way that during the coating of the fabric band with the flowable prepolymer mixture the two bands cannot slip with respect to one another.

REFERENCES:
patent: 3592709 (1971-07-01), Marzocchi et al.
patent: 3673024 (1972-06-01), Eriksson
patent: 4018641 (1977-04-01), Donaldson
patent: 4288475 (1981-09-01), Meeker
patent: 4552620 (1985-11-01), Adams
patent: 4787946 (1988-11-01), Romanski
patent: 4981721 (1991-01-01), Krenkel et al.

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