Gas permeable material, method of making and use

Details Gas permeable material, method of making and use Gas permeable material, method of making and use

D - Textiles, Paper

06

M

D06M 23/16 (2006.01) B32B 7/12 (2006.01) D06N 3/00 (2006.01) D06N 7/00 (2006.01)

Patent

CA 2296321

A method of making a gas permeable material having a diffusive gas permeability at 0.21 atmosphere diffusive driving force in the range of about 0.5 × 10 5 cm3/100 square inches/day to about 2 × 10 5 cm3/100 square inches/day. The method comprises the step of coating a pattern of spots of a gas impermeable material onto a porous substrate followed by a step of enlarging the pattern of spots to cover greater than about 95 % of the porous substrate such that the gas permeability occurs only through openings between the pattern of spots. The gas impermeable material is preferably a hot melt adhesive and the porous substrate is preferably a nonwoven. The step of enlarging the pattern of spots includes smearing substantially circular spots into oblong spots as the pattern of spots is printed onto the porous substrate until the oblong spots partially overlap. The smearing is achieved by operating a printing screen at a surface speed higher than a draw rate of the porous substrate. Alternatively, the step of enlarging the pattern of spots includes calendering through a fixed gap the porous substrate after the pattern of spots is coated thereon.

Procédé servant à fabriquer un matériau perméable aux gaz, dont la perméabilité diffusive aux gaz à une force d'entraînement diffusif de 0,21 atmosphère est située dans une plage de 0,5 x 10<5> cm<3>/100 pouces carrés à 2 x 10<5> cm<3>/100 pouces carrés/jour. Ce procédé consiste à revêtir un substrat poreux par une configuration de plages constituée par un matériau imperméable aux gaz, puis à agrandir cette configuration de plages afin de recouvrir plus de 95 % du substrat poreux, de sorte que seules des ouvertures situées entre ladite configuration de plages sont perméables aux gaz. Ce matériau imperméable aux gaz est, de préférence, un adhésif thermofusible et le substrat poreux est, de préférence, un non-tissé. L'étape d'agrandissement de la configuration de plages consiste à étaler les plages sensiblement rondes afin d'obtenir des plages oblongues simultanément à leur impression sur le substrat poreux jusqu'à ce que ces plages oblongues se chevauchent partiellement. On effectue l'étalement au moyen d'un cadre d'impression à une vitesse superficielle supérieure au taux d'étirage du substrat poreux. Dans un autre mode de réalisation, cette étape d'agrandissement de la configuration de plages consiste à calandrer à travers un espace fixe le substrat poreux après son revêtement par la configuration de plages.

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