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

1979-11-13

1981-09-15

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-uniform, irregular or configured web or sheet

162115, 162129, 162146, 162208, D21H 502

Patent

active

042895804

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.times.10.sup.-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 heat seal phase. The droplets from the spray displace 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.

REFERENCES:
patent: 995602 (1909-09-01), Howes
patent: 2414833 (1947-01-01), Osborne
patent: 3067087 (1962-12-01), Gorski et al.
patent: 3350260 (1967-10-01), Johnson

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