Zhejiang Duobao Industrial&Trade Co., Ltd.
Add: Qilong Industrial Zone,Zhiying,Yongkang,
Tel: 86-579-87448851 Fax: 86-579-87446866
Pressure is created at the beginning by boiling a liquid, such as water or broth, inside the closed pressure cooker and then trapping the steam. This increases the internal pressure and temperature, which is maintained throughout the cooking time. Afterward, the pressure is slowly released so that the vessel can be safely opened.
Pressure cookers may be referred to by several other names. An early pressure cooker, called a steam digester, was invented by Denis Papin, a French physicist, in 1679. Large pressure cookers are often called pressure canners in the United States because of their capacity to hold jars used in canning. A version of a pressure cooker used by laboratories and hospitals to sterilize objects is known as an autoclave. In the food industry, pressure cookers are often referred to as retorts or "canning retorts".