Cotton fabric was exposed to an atmospheric pressure glow discharge (APGD) ignited by high voltage and helium. Ultrasonic atomization of an aqueous sericin solution injected as an aerosol into the APGD zone gave rise to the rapid deposition of a functionalized plasma polymer film. Sericin coating onto the cotton surface was confirmed by scanning electron microscopy, and the chemical composition was analyzed by Fourier transform infrared spectrophotometry and X-ray photoelectron spectroscopy. It was found that the plasma power could affect the chemistry of the coating. The treated fabrics were tested for UV resistance, crease recovery angle, and water uptake. Results showed that these properties had been improved.
A new decoupling control structure is presented for complex special shape pipe welding process, which consists of model construction by reorganization method. Using this structure, an decoupling control system is established which realizes an adaptive decoupling control strategy for the welding processes with integrated complexities by using structure of decoupling control system and based on multivariable predictive function and nash optimization to making sure the right coefficient. Such system can be easily implemented on the welding peocess and simulation show this approach is effective.
The oil seal of the high-speed non-woven loom needle spindle is a difficult problem, which has always been probed among the product manufacturer and the users. A new structure, the micro-nanon magnetic fluid seal plus the packing seal, is designed in this paper. It is suitable for the high-speed linear reciprocating spindle. The new structure is applied to the practical production. Through the productive experiments, the reliability of the structure is further optimized. So the reliability problem of the needle spindle oil seal is well solved.
In this paper, polyethylene film was treated by APGDLD (atmospheric pressure glow discharge liquid deposition) to polymerize acrylic acid onto the surface to improve its hydrophilicity. The effect of APGD and APGDLD on the surface modification is compared. Influence of various treatment conditions on polymerization degree and contact angle such as applied voltage, discharge gap, reaction gas flow rate and treatment time were investigated. Treating effect was characterized via contact angle measurements, SEM and ATR-FTIR. The results indicated the hydrophilicity of the polyethylene film surface was enhanced and well reserved by APGDLD.
As a new textile material, silk/PLA mixture combines the outstanding characteristics of silk and PLA fibers, but this mixture is subjected to some problems owing to the poor alkali resistance of PLA fiber during the pretreatment and reactive dyeing processes. In the present work, the alkali resistance of silk/PLA mixture was tested with three alkalis, namely sodium hydroxide, sodium carbonate and sodium bicarbonate. It was found that silk component was less influenced by sodium carbonate and sodium bicarbonate, whereas PLA component was more or less influenced by three alkalis. Silk/PLA mixture showed low weight loss after sodium carbonate and sodium bicarbonate treatment, but had very high weight loss after sodium hydroxide treatment. 10 g/L sodium carbonate and 3 g/L sodium hydroxide resulted in the obvious changes in the morphological structure of PLA. After the alkaline treatment, the IR spectra of PLA treated with 3 g/L alkali displayed great variations, and the intensity of the peak at 3429.3 cm-1 increased with the strength of alkalis, showing that the partially hydrolysis of PLA occurred.
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