Heat seal fibrous web and method of its manufacture

Details Heat seal fibrous web and method of its manufacture Heat seal fibrous web and method of its manufacture

D - Textiles, Paper

21

H

92/10, 92/11, 92

D21H 27/08 (2006.01) D21H 13/14 (2006.01) D21H 21/24 (2006.01) D21H 23/28 (2006.01) D21H 23/50 (2006.01) D21H 27/02 (2006.01)

Patent

CA 1138239

1 Abstract Improved infusion web material for tea bags and the like is provided by using synthetic pulp in the heat seal phase and forming therein an array of a large number of small discrete craters. These craters, which exhibit an average planar area of at least about 1 x 10 -3 square centimeters, are formed prior to drying the initially formed multi-phase material by directing a low impact mist-like liquid spray onto the heatseal phase. The droplets from the spray dis- place the fibers to form the shallow craters and, at times, expose portions of the underlying non-heat seal fiber phase. The small craters are present throughout the heat seal phase at a concentration of at least about 40 per square centimeter and occupy about 10-75 percent of the total exposed surface area of the heat seal fiber phase of the material. The web also is treated with a surfactant.

358738

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