Electric Heating Pad – NSL BC-220 Bestcare (Taiwan)

A Heating Pad is a pad used for warming of parts of the body in order to managepain. 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]

把它放在沸腾的垫可以重用窟er for 10–15 minutes, which redissolves the sodium acetate trihydrate in the contained water and recreates a supersaturated solution. Once the pad has returned to room temperature it can be triggered again. Triggering the pad before it has reached room temperature results in the pad reaching a lower peak temperature, as compared to waiting until it had completely cooled.