What is Lazy Steam?
Lazy Steam is non-turbulent, noiseless, pure transparent steam delivered from the drilled holes of a header into stainless steel wool packed over the holes (see photo below). Lazy Steam is effective because non-condensable air is kept out.
Good example of transparent “lazy” steam exiting a Lazy Steam Injector in the lab. A thermocouple held in the transparent steam registers more than 212°F but it quickly drops below 212° in the “fog” after it gives up it s valuable btu’s.
Why Lazy Steam?
Heating the sheet lowers the viscosity of the water inside, making it easier to mechanically remove. It is much more economical to mechanically remove water early in the paper making process rather than evaporating it. Unlike other steam shower designs, Lazy Steam discharges from the nozzle with no turbulence and at a low velocity, so it will never disrupt the sheet surface no matter what operating pressure.
Where to use Lazy Steam?
Lazy Steam can be applied virtually anywhere on the paper machine that vacuum is used to pull cool air into the sheet. Lazy Steamers are compact so can be safely mounted in tight locations that other designs cannot. Please refer to the Technical Articles for specific information.
Best application locations are:
Over Fourdrinier suction boxes
Suction couch (with or without lumpbreaker)
Straight-through suction press nip
Center suction roll of Bi-Nip or Tri-Nip ("tunnel")
Ulhe Boxes for fabric cleaning and conditioning
Automatically-controlled Great Profiler over Fourdrinier suction boxes on a Linerboard machine.
Economical non-profiling Lazy Steam hood over Fourdrinier flat boxes on a Fine Paper machine.
Illustration of transparent, pure, "lazy steam" filling straight-through double-felted suction press nips on two Pulp machines.
Diagram and photo of Lazysteam injector in a suction couch.
Illustration of a Lazy Steam Injector over a blowbox on a Corrugating machine.
A Lazy Steamer over a Uhle box to clean and condition the press fabric on a 100% Recycled Linerboard machine. This is one of our most popular applications.