这个怎么运作
当从模具挤出时，意大利面有大约30％的水分。表面是粘性的，并且具有附加到任何可能在等级上与其他封闭的面食串接触或混淆的任何东西的趋势。为避免这种情况，面食通过已经在等级加载阶段的热和潮湿空气通风;该通风导致表面湿度的第一减少，因此粘稠。控制空气容量的相关因素以从面团中除去水分的是水蒸气量，温度，空气量在面食上，绝对湿度，水分含量，相对湿度和（RH）（以％为单位）。在预干燥阶段，水颗粒从产品的内部朝向表面的快速迁移，导致湿度过量的蒸发。在此过程中，表面必须释放过多，这将关闭剩余水分可以通过毛细管性达到表面的空隙，从而蒸发。每当它发生时，产生的紧张局势将损坏产品和裂缝也很久也崩溃了。长切割面的烘干机通常是由单级隧道制成的单元，与干燥线分开。预干燥机的机械特性主要根据采用的技术而变化。 The factors are thermo-hygrometric degree of the room and speed on which of the product passing through the tunnel. An even ventilation is a key factor to eliminate as steam, the water released from the heated pasta, the air should keep a high relative moisture rate inside the pre-dryer, to assure the essential condition for a normal water extraction. The dryer has usually more than one level from three to five or more. the course is longer, and longer is the time required for the drying stage to be ended. A multi- level course enables to reduce the dryer length and the length of the whole process. This unit dimensions are related to the manufacturer technology, in case of high temperature drying technology, the unit size is reduced since the process to achieve the final moisture value and its total stabilization is quicker, on contrary low temperature technology requires longer units. The not traditional microwave pasta drying equipments achieve rapid drying process and have high drying efficiency, pasta and instant noodles can be dried and sterilized simultaneously in a shorter time than in traditional tunnels. Microwave equipments are adopted by large-scale industrial pasta producers to speed up and to lower production costs. These tunnels have a high degree of automation, the temperature control and microwave output can be adjusted automatically. A cooling unit at the end of the tunnel reduces the pasta temperature and brings it back to room temperature. The pasta cooling may take place inside the dryer or in separate short tunnel. Cool humid air ventilated over the pasta is monitored by special probes that check the temperature and the moisture degree. After the cooling the racks are placed onto a stick-removing machine, which automatically removes the long pasta, cutting it at the desired length and ready for the packaging machine.
