Pleated filter structure for air cleaning and air filtering method

Abstract

A pleated filter structure is provided for the removal of gaseous pollutants from a gas mixture to be filtered. The structure comprises an ideally air impervious filter sheet, being pleated so as to form an adjacent series of slit shaped conduits for the passage of air through the structure, each bounded on either side by the folded sections of the filter sheet, these being joined by a series of top creases and bottom creases. The top and / or bottom creases incorporate slit-shaped openings allowing passage of a gas mixture into and / or out of the structure. Gas to be filtered enters through one side of the structure, passes laterally across the filter sheet section surfaces and exits through the other side. Also provided are methods for the manufacture of a pleated filter structure, comprising forming rows of slit-shaped openings in a filter sheet and providing folds, in alternating directions, along the lengthwise extensions of adjacent rows of openings. Methods for filtering a gas are also provided.

Description

technical field [0001] The invention relates to a method and a device for filtering gaseous pollutants from a gas to be filtered and to a method of manufacturing the device. Background technique [0002] Indoor air pollution presents a significant health hazard in many urban areas around the world. Air pollution sources encountered both outdoors (eg, from motor vehicles and industry) and indoors (from cooking, smoking, burning candles, burning incense burners, outgassing construction / decoration materials, use of outgassing waxes, paints, polishes, etc.) . Indoor pollution levels tend to be higher than outdoors. At the same time, many people live indoors most of the time and thus may be exposed to unhealthy levels of air pollution on a near-continuous basis. [0003] One way to improve indoor air cleanliness is by installing indoor air cleaners that continuously circulate indoor air through a cleaning unit that includes one or more air filters. Another way to improve indo...

AI Technical Summary

Problems solved by technology

Their drawback is that only a very limited amount of activated carbon material can be contained inside the filter structure, resulting in only a short useful activated carbon filter life

Here, the air must also pass through the composite filter sheet, thus incurring a dramatic increase in air pressure drop when the amount of activated carbon material inside the filter structure increases

Images