Multilayer laminated sheet material usable for making protective garments, in particular for fire-fighters
This material is remarkable in that it is made by weaving or knitting, in such a manner as to form a structure comprising two superposed faces ( 1, 2 ) intermittently interconnected to each other so as to form pockets, and in which: one of the layers shrinks under the effect of heat; and the linking between the layers is implemented by intermittently linking selected yarns so as to form said pockets.
1. A multi-layer laminated sheet material, for a thermal barrier in making protective garments, the sheet material being woven or knitted, comprising:
at least a first layer and a second layer superposed and intermittently linked to each other by selected yarns so as to form pockets between the first and second layers, the first layer and the second layer comprised of one or more fire resistant materials;
wherein the pockets are flat in normal use, and wherein the second layer is comprised of a material that shrinks under the effect of heat more than the first layer in order that under the effect of a high temperature of about 300° C. and of the shrinkage difference between the two layers, the pockets project in relief, increasing the insulating ability of the material against the high temperature.
2. A laminated material according to claim 1 , wherein the second layer that shrinks under the effect of heat is constituted completely or in part by yarn that shrinks under said effect of heat.
3. A laminated material according to claim 1 , wherein the pockets constitute channels, with shrinking under the effect of heat taking place only in the yarns that extend perpendicularly to said channels.
4. A laminated material according to claim 1 , wherein the shrinking effect of the second layer is the result of the presence of a membrane fixed on said layer, said membrane being made of a material which is suitable for causing it to shrink under the effect of heat.
5. A laminated material according to claim 1 , wherein the shrinking effect of the second layer is the result of the presence of a coating on said layer of a material suitable for shrinking under the effect of heat.
6. A laminated material according to claim 1 , the first layer comprising warp and weft yarns and the second layer comprising warp and waft yarns, wherein the structure ratio between the density of warp and weft yarns of the second layer and the density of the warp and weft yarns of the first layer lies in the range one-to-one to one-to-ten.
7. A protective garment according to claims 1 , 2 , 3 , 4 , 5 , or 6 , wherein the laminated material is combined with a substrate, a breathing membrane and an outer fabric, in that order.