HEAT SEAL FIBROUS WEB AND METHOD OF ITS MANUFACTURE

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 1x10-3 square centimeters, are formed pr...

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Bibliographic Details
Main Authors HOFFMAN, HERBERT A, ELSTON, COLIN, MURPHY, H. JOSEPH
Format Patent
LanguageEnglish
Published 13.03.1985
Edition4
Subjects
BRAIDING
COTTON-WOOL
FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS
IMPREGNATING OR COATING OF PAPER
KNITTING
LACE-MAKING
MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL
METHODS OF PRODUCING PAPER THEREON
NON-WOVEN FABRICS
PAPER NOT OTHERWISE PROVIDED FOR
PAPER-MAKING
PAPER-MAKING MACHINES
PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D
PRODUCTION OF CELLULOSE
PULP COMPOSITIONS
TEXTILES
TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
TRIMMINGS
WADDING
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Summary: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 1x10-3 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.
Bibliography:Application Number: EP19800901989