浙江省商业厅在杭州召开由杭州肉类联合加工厂试制的PAPI—J型冷库门技术鉴定会。杭州肉类联合加工厂从1984年开始试制PAPI—J型冷库门,其主要改进是门的隔热选用硬质聚氨脂,并采用现发泡灌注工艺,这种库门属第三代产品,比过去用软木作隔热层的第一代产品,用聚苯乙烯泡沫塑料块作隔热层的第二代产品,有明显地降低了导热系数和吸水 Zhejiang Provincial Department of Commerce held in Hangzhou by the joint trial of meat processing plant in Hangzhou PAPI-J-type cold storage door technical appraisal. Hangzhou meat processing plant trial since 1984, PAPI-J type refrigerator door, the main improvement is the selection of rigid polyurethane door insulation, and the use of foam filling process, this library is a third-generation products , A second generation product that uses polystyrene foam blocks as a thermal insulation layer compared to the first generation of products that used cork as insulation and significantly reduced the thermal conductivity and water absorption