Electric Heating Pad – NSL BE-240 Bestmed (Taiwan)

加热垫是用于温暖身体部分的垫子，以管理pain. Localized application of heat causes the blood vessels in that area todilate, enhancingperfusionto the targeted tissue. Types of heating pads includeelectrical,chemicalandhot water bottles.

Specialized heating pads (mats) are also used in other settings. Heat mats inplant propagationstimulates seed germination and root development; they operate at cooler temperatures. Heat mats also are available in thepettrade, especially as warming spots for reptiles such as lizards and snakes.
Amoist Heating Padis used dry on the user’s skin. These pads register temperatures from 76 to 82 °C (169 to 180 °F) and are intended for deep tissue treatment and can be dangerous if left on unattended. Moist heating pads are used mainly by physical therapists but can be found for home use. A moist cloth can be added with a stupe cover to add more moisture to the treatment.

Disposable chemical pads employ a one-timeexothermicchemical reaction. One type, frequently used forhand warmers, is triggered by unwrapping an air-tight packet containing slightly moistironpowder and salt orcatalystswhichrustsover a period of hours after being exposed tooxygenin the air. Another type contains separate compartments within the pad; when the user squeezes the pad, a barrier ruptures and the compartments mix, producing heat such as theenthalpy change of solutionofcalcium chloridedissolving.

The most common reusable heat pads contain asupersaturatedsolution ofsodium acetatein water.Crystallizationis triggered by flexing a small flat disc of notchedferrousmetal embedded in the liquid. Pressing the disc releases very tiny adhered crystals of sodium acetate^[1]into the solution which then act asnucleationsites for the crystallization of the sodium acetate into the hydrated salt (sodium acetate trihydrate, CH₃COONa·3H₂O). Because the liquid is supersaturated, this makes the solution crystallize suddenly, thereby releasing the energy of the crystal lattice. The use of the metal disc was invented in 1978.^[2]

可以通过将其放入沸水中10-15分钟来重新使用垫子，从而将乙酸钠三水合物重新固定在含水中并重新生成过饱和的溶液。垫子恢复到室温后，它可以再次触发。与等待完全冷却之前，触发垫子在达到室温之前，在达到较低的峰温度的垫子中导致垫子达到较低的峰值温度。