By Application:    Architectural Laboratory Water Treatment Marine Air Handling

Custom water tank

Ultrasonic Humidification: The most important characteristic of an ultrasonic humidification chamber is that it allows a free and even flow of air throughout the sealed environment. To assemble a chamber, commercially available baker's racks covered with plastic are ideal. Racks may be purchased with custom-fitted plastic covers that are lightweight and easy to clean, seal with a plastic closure (zipper) that resists rusting, and provide an effective vapor seal. An alternative method is to drape polyethylene sheeting over the entire rack and seal it with Velcro (R) buttons. To support the objects inside the chamber, the rack is outfitted with shelves: plastic screens purchased to size or acrylic egg-crate louvers (used to cover recessed ceiling fixtures) cut to size work well. An ultrasonic humidifier, which emits a fine mist, is placed on the floor or on the lowest shelf. The humidifier should be filled only with distilled water (minerals and biological contaminants in tap water make the equipment difficult to maintain). Several trial runs with non-collection materials will help determine the most effective setting and location for the humidifier within the chamber.
Humidification (process). Regardless of which system is used, the procedures for handling during humidification and flattening are similar. For both processes directions are outlined below. It is important to test the procedure/equipment thoroughly before beginning a large-scale project or treating valuable materials.
Begin humidification treatment early in the day so that the progress of the materials in the chamber can be monitored frequently. Do not attempt to humidify objects overnight or when progress cannot be supervised.
Before placing papers in the chamber, lay them on a sheet of spun polyester (e.g., Hollytex (R), Cerex(R), or Remay(R)) for support and set them in the chamber by handling only the polyester. Tightly rolled and/or brittle papers may have to be humidified in stages. Do not attempt to unroll particularly resistant papers for humidification. Initially, place them in the chamber rolled (folded) and attempt to unroll (unfold) them over the course of the day, or over the course of several daily humidification sessions. The safest way to unroll very tight or brittle paper is by scrolling the rolled paper onto a progressively larger archival quality tube after each session in the humidity chamber.
Some conservators have used fungicides such as thymol (C10H14O) in humidification tanks to prevent the growth of mold. The use of thymol is not necessary, however, if the duration of the humidification process is limited as described here.

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Custom water tank