High efficiency dust sock

Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing

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55528, 55529, 55DIG5, 156 731, 156 732, 1563084, 428903, 442347, 442362, 442364, B01D 2911, B01D 4604, B32B 526, B32B 3126

Patent

active

056077351

ABSTRACT:
A dust sock filter medium laminate is provided which has at least two nonwoven webs of microfibers which have an average diameter (using a sample size of at least 10) between about 10 and 25 microns and which webs have been joined by a method comprising the steps of (a) directing the component layers to a separation zone, (b) applying water in the amount of from about 5% to 25% based on the weight of the combined layers, (c) combining the component layers, (d) passing the combination through a sonic bonder operating within the range of up to about 40,000 cps against a patterned anvil to produce a corresponding pattern of thermal bond areas over about 3% to 25% of the surface area of the combination, and, (e) drying the sonically bonded combination.

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