大型罐車采用現場发泡的隔热层,能使装載物的温度保持在一定限度之內达半个月之久。要获得这种效果,主要的是要求隔热层中沒有空虛之处。为了检查空虛位置之所在,美国車辆和鑄造公司采用了紅外綫照相技术。 The use of on-site foaming insulation for large tankers allows the temperature of the load to remain within a certain limit for two weeks. To achieve this effect, the main requirement is that there is no emptiness in the insulation layer. In order to examine the whereabouts of emptiness, U.S. vehicles and foundries have adopted infrared photography.