Zongzi is a traditional delicacy of the Chinese people, especially in southern regions like Zhejiang. It is no longer a food reserved solely for the Dragon Boat Festival; many people now enjoy zongzi during ordinary days, business trips, and travels. Zongzi comes in various flavors, such as those with salted egg yolk, cured meat, ham, and more.

As the demand for zongzi has increased, ingenious Chinese producers have begun industrial factory production. They use large industrial pressure cookers to boil the zongzi, which are then vacuum-packed and sterilized at high temperatures in specialized sterilization kettles. High-temperature sterilized zongzi can be stored and sold at room temperature, expanding their distribution radius nationwide and even for export.

The production of zongzi relies on specialized steaming and boiling equipment. Zhongrun’s zongzi cooking kettle uses steam or electric heating as the primary heat source, employing sealed high-pressure cooking to shorten processing time. It features a large heating area, high thermal efficiency, even heating, short boiling time, and easy temperature control. The equipment is typically designed in a vertical or tiltable structure, integrating a kettle body, flange, sealed lid, hanging basket, and control system. This kettle is specifically engineered to meet the cooking requirements of zongzi, ensuring that the finished product is soft, sticky, sweet, and thoroughly cooked without any rawness.

Sterilization of zongzi is mainly achieved through high-temperature methods, utilizing high-temperature sterilization kettles.

High-temperature sterilization kettles are one of the commonly used sterilization devices in the food industry, effectively sterilizing vacuum heat-resistant packaged zongzi. The equipment consists of a kettle body, lid, opening mechanism, safety interlock device, steam spray pipe, and other components. It uses steam or hot water at a certain pressure as the heat source, offering advantages such as uniform heating, rapid sterilization, and easy temperature control.