Check the density of general undercoat carpet and flexibility, basically have two kinds of methods.
检查一般短毛地毯的密度和弹性，主要有两种方法。
Commercial experiment had better results than that of bench test. Soft sponge back-lining carpet with symmetrical bubble hole density and high elasticity carpet was produced.
工业实验结果比小试结果更佳，制得了泡孔密度均匀、柔软、弹性好的海绵背衬地毯。
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