Preserved fruits, also known as candied fruits, are foods made from fruits and vegetables that are pickled with sugar or honey. The production and consumption of preserved fruits has a long history of thousands of years in China, and its historical records can be traced back to the Three Kingdoms period. "Romance of the Three Kingdoms" contains: "Bright out of the West Garden, Fang Eat raw plum, so that the Yellow Gate to the middle of the Tibetan honey-soaked plum" At that time, in order to solve the problem of fresh fruit is not resistant to preservation, the fresh fruit is immersed in honey, which can play the effect of antiseptic, fresh-keeping, and adding sweetness, but there is no preserved fruit production steps such as boiling at that time. Nowadays, there is a more complete way to make preserved fruit with the addition of a steam generator.
At present, the widely used production method of preserved fruit is the method of multiple boiling. The pretreated raw materials were successively put into a sugar solution with a concentration of 30~40%, 50~60% and 35~70%, and boiled for 5 minutes, 10 minutes and 30 minutes respectively. The purpose of the first cooking is to prevent the oxidation and discoloration of the tannin substances and maintain the bright color, the second cooking is to allow the fruit to absorb the sugar solution and increase the sugar content, and the third time is to remove excess water. At each interval, the sugar solution and raw materials need to be poured into the tank and soaked for 24 hours. Until the end of the third cooking, the sugar solution is removed and filtered, and after cooling, the fruit is kneaded into an oblate shape by hand or machinery, and after drying, it is the finished product.
So what role does the steam generator play in the process of making preserved fruits?
In the above processing process, it is not difficult to see that the processing of preserved fruits requires precise control of the temperature during cooking, and it is necessary to maintain a constant temperature during cooking. If the original processing method is adopted, the fire power cannot be accurately controlled, not only the sugar solution is not easy to penetrate into the fruit, but also it is easy to cook into sauce, resulting in losses for enterprises. The steam generator is equipped with PLD-ipower condensing steam intelligent control system, which can automatically monitor and adjust the working status, improve the automation level of the production line, and control the failure rate with accurate temperature during the processing of preserved fruits. At the same time, the steam generator operates fully automatically with one key, without personnel on duty, saving personnel costs, and truly reducing costs and increasing efficiency for enterprises.