比利时 PI 工程公司接到一项生产一种新颖车座的任务,但工人们发现做车座垫里的泡沫材料太软、易肿胀,所以难以精确地裁切,得到所需形状。为了解决此难题,该公司求助于在当地的 BOC 气体公司。一位销售工程师提出用四只喷嘴向泡沫材料喷射液氮,使泡沫材料暂时变硬,这时再切裁,可达到1mm 精确度,事实证明这种方法可得到完美的结果。 PI Engineering, of Belgium, received a task to produce a new saddle, but workers found the foam in the saddle was too soft and swollen, making it difficult to cut precisely to get the desired shape. In order to solve this problem, the company turned to BOC gas companies in the area. A sales engineer proposed to spray liquid nitrogen into the foam with four nozzles to temporarily harden the foam, then cut to 1 mm accuracy, which proved to be the perfect result.