| 摘要 |
<p>A reusable heat bag comprises a sealed bag (l). An aqueous solution (2) of 80%-90% sodium acetate and a stainless steel sheet (3) are contained in the sealed bag. The stainless steel sheet has concave and convex marks (4) on its surface. The solution becomes exothermic crystallization by distorting the sheet. A little food pigment is contained in the solution for enhancing color. The sealed bag can be made into multisections separating from each other, each section contains a stainless steel sheet, and the multisections of the sealed bag have different colors. The sealed bag can be made into various shapes or three-dimensional structures.</p> |
