In Japan in the 1970s, someone invented heat packs based on chemical principles. Without using fire, electricity, water, or other energy sources, they generate heat simply by opening the outer packaging, and can maintain warmth for 8-18 hours (average temperature 52℃). Therefore, they are called body warmers or heating pads (convenient hand warmers). Today, in Japan, these convenient hand warmers have become a necessity of modern life. During outdoor activities in winter, they can prevent muscle stiffness from cold, prevent frostbite, prevent colds, or relieve back pain, leg pain, shoulder pain, and other physiological ailments. In Japan, over 800 million units were sold in three months during the winter, and in 2005, a total of 1.47 billion heat packs were sold domestically. Because they don't use fire, they are safe for both children and the elderly.
Initially, most heat packs in China were imported from Japan by trading companies. With the increasing domestic market demand, the huge profit margin and low policy barriers attracted many local companies to enter the heat pack industry. In 2006, many brands emerged in China. Household chemical companies leveraged their industry advantages to quickly seize the daily necessities market and earned their first fortune, but at this time, due to technology and national policy reasons, some companies failed.
By 2008, the Chinese heat pack market had gradually matured. Through a long period of market cultivation, consumer awareness gradually awakened, and consumption habits were slowly forming. Many companies used their existing channel advantages, research and development advantages, and national policy advantages to open the door to the untapped market of medical heat therapy and physiotherapy heat packs. According to incomplete statistics, by the end of 2008, there were more than 100 domestic heat pack manufacturers, with an annual production capacity of 181 million units. Initially, most heat packs were imported from Japan by trading companies. With the increasing domestic market demand, more and more manufacturers turned their attention to the heat pack market. In 2006, most manufacturers began producing and selling heat packs. Due to the large number of manufacturers, some manufacturers were tempted by the prospect of high sales and produced large quantities of heat packs. With the boom in heat pack sales in the domestic market, many manufacturers, driven by profit, led to uneven quality of heat packs on the market.