A - Human Necessities – 43 – B
Patent
A - Human Necessities
43
B
12/100, 117/176,
A43B 7/00 (2006.01) A43B 13/40 (2006.01) A43B 17/10 (2006.01)
Patent
CA 1068107
ABSTRACT OF THE DISCLOSURE An odour and moisture absorbing insole or insock for covering the inner sole of footwear has a bottom open cell latex foam layer with a smooth bottom skin for engaging the bottom inner sole of footwear, an intermediate non-cellular latex layer with discrete activated charcoal particles dispersed throughout and locked in this layer, a porous slippery abrasion resisting top fabric layer protecting the foot or sock of the wearer against discolouration or irritation, and spaced perforations extending through the three layers to enhance the circulation of air toward and away fro- the foot of the wearer into intimate contact with the charcoal in the intermediate layer as the open cell bottom foam layer is alternately compressed and expanded upon application and release of foot pressure on the insole as when walking. The open cell bottom layer and the top fabric layer are free from charcoal, and discolouration of the footwear, foot or sock is eliminated by bonding the charcoal particles in the intermediate layer. The intermediate latex layer containing the activated charcoal is deposited in viscous slurry form on top of the non-slippery face of the fabric, doctored to a controlled thickness, a viscous foam forming latex mix is deposited on top of the doctored slurry and in turn is doctored to a controlled thickness providing a smooth top surface, and the three layer assembly is heated to set and form the top layer, and to set the intermediate layer in bonded relation with the fabric layer and the foam layer The thus formed three-layer laminated sheet is punched to form a myriad of holes therethrough and is trimmed to insole shape The process may be continuous with the fabric being unwound from a roll, advanced under latex feeders and under the adjacent doctors and then fed continuously through a drying oven to emerge as a laminated sheet which is easily rolled and transported to perforation forming punches and insole shaping cutters.
291187
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