| 摘要 |
PROBLEM TO BE SOLVED: To make a buoyancy material and floatable personal belongings using it light and soft, waterproofing, protective against the cold and favourable in a heat retaining property and make it work the same action as a lift jacket by forming a synthetic resin foaming sheet having fine closed cells in specific thickness and apparent density. SOLUTION: Thickness of a synthetic resin foaming sheet having fine closed cells is made 0.05-5mm, and apparent density is made 0.002-0.2g/cm<3> . This foaming sheet is mainly made of polyethylene and polypropylene, and a simple substance or a blended substance of high density, intermediate density or low density polyethylene and polypropylene and their denaturated copolymer, etc., are favourable. A foaming agent is to be hydrocarbon halide of liquid propane gas, freon 12, etc., and azodicarbon amid, sodium citrate, sodium bicarbonate, etc. Additionally, for example, in case of a long jacket, a front body 1 and a back body 2 are quilting sewn, and a sleeve 3 and a pocket 4 are stitched and stopped. Specifications and a design of a quilting 5 are optionally selected. |
