1982年,加拿大专利报导了一种可反复使用的产热袋。它包括一个用橡皮或塑料材料制成的密封容器,内含醋酸钠溶液和边缘有切口的不锈钢条。袋的大小和形状视用途而异。醋酸钠溶液由醋酸钠和水制成,用量应能使溶液至少过冷到产热袋打算用的环境温度,而且在此温度下无意摇晃不致激活溶液。产热袋的最 In 1982, the Canadian patent reported a reusable heat-generating bag. It consists of a sealed container made of rubber or plastic material containing sodium acetate solution and stainless steel bars with cutouts on the edges. The size and shape of the bag will vary depending on the application. The sodium acetate solution is made of sodium acetate and water in such an amount that the solution is at least supercooled to the intended ambient temperature for the heat-generating bag and that unintentional shaking at this temperature does not activate the solution. Hot bags most