The cold-pad-batch technology is applied mainly in the pretreatment and dyeing of cellulosic fabrics and shows lots of advantages such as technique simplicity, low energy consumption and reduced sewage emission especially for productions of multi item and short run. The degumming process of mulberry silk fabrics with “cold-pad-batch” method using tea sapogenin was studied in this paper. The effects of a few factors such as concentration of tea sapogenin, NaOH and Na2S2O4 as well as time on the whiteness and weight loss of fabric obtained: NaOH 8g/L, tea sapogenin 6g/L, Na2S2O4 5g/L, Lamepon A 2g/L, JFC 1g/L, Na2SiO3 2g/L and batching time 18h. After degumming with “cold-pad-batch” process, the whiteness and weight loss of mulberry silk fabrics were 69.3 and 22.8%, respectively. The handle of fabric was soft. Compared with traditional soap soda boiling degumming process, the properties of mulberry silk fabrics degummed with “cold-pad-batch” method using tea sapogenin can meet the requirement of weight loss, whiteness, strength and show some benefits such as low energy consumption and water saving and low toxicity. The energy consumption will be 25% lower than that of soap soda boiling degumming process.

By using the material of reinforced polyurethane (RPU) foam, the common bulkhead is devised for cryogenic tanks in this paper. Properties of RPU foam are obtained through experiments. Based on the properties, the structure is designed with the integration of special features including lightweight, easy to manufacture, load bearing and thermal insulation. Based on numerical simulation, thermal analysis, stability and thermal mechanical coupling behavior of the structure are analysed. The results show that the common bulkhead not only satisfies the heat insulation requirements of cryogenic tanks for liquid hydrogen and oxygen, but also keeps stability.