A GF/PP commingled yarns knitted fabric was processed into laminates composites by hot press and a processing parameters investigation had been carried out to determine the most suitable values of processing pressure, holding time and cooling condition. The consolidation quality was characterized by means of void content and tensile strengths. It was found that the void content decreases while the tensile strength increases with the increasing of holding time, and under the gradually cooling rate with pressure in hot press. Optimal processing conditions for manufacturing of commingled GF/PP biaxial knitted fabric composites were suggested.
A statistics method was carried out to characterize the fatigue strength distribution of GF/PP composites. Based on the stress of yarn bundles, the Weibull distribution parameters were determined. Also, we had presented an expression of interfacial shear stress between yarn tows and matrix. A Monte-Carlo simulation with 2D shear-lag equation had been used to analyze the tensile strength and simulate the failure process of unidirectional stretch of composites. Good agreements were obtained between the predicted results and experimental data.
The knittability of basalt fiber yarn for knitted fabrics was estimated from two aspects. Firstly the effect of 3 kinds of head size of needle hook on the loop strength of basalt fiber yarn was analysis by the experimental data. Then the basalt fiber yarn was knitted into plain, 1*1 rib and all needle rib knitted fabrics in 5 different loop lengths in a flat knitting machine. The influence of loop length, fabric stitch and fiber fineness on the fiber damage degree were studied by means of the tensile strength of the yarn taken from the fabrics for all kinds of fabrics. The experimental results show that for these 3 kinds of basalt weft knitted fabrics there is a best loop length in which the fiber damage degree caused by the knitting process is the smallest and the value is different for each stitch.
In order to improve the moisture absorption of the acrylic yarn, the acrylic yarn was firstly hydrolyzed in the caustic soda (NaOH) solution to convert the cyano group molecular into hydrophilic group, then the reticulated coatings was formed on fiber surface by chemical crosslink. Furthermore, the effect of the acrylic hydrolysis temperature, NaOH dosage, ethanol, cross-linking agent (CLA) on acrylic affinity for moisture was discussed through the contrast experiments. The best experimental conditions were investigated by the orthogonal experiments, and the optimum process parameters were obtained. The results indicate that under the condition of NaOH concentration of 6%, hydrolysis time of 15 min, temperature of 80°C, and cross-linking agent concentration of 0.09% on weight the yarn (owf), the moisture regain of modified acrylic yarn has increased by 245.4% as compared with that of untreated acrylic yarn and the water absorption has been improved greatly.
First selected weft plain and plain weave fabrics as samples, and joined these samples by four thread overlock stitch in different ways and four stitch densities, then tested tensile properties of the fabrics to analyze sewing properties of the fabrics, finally found variation of the fabrics properties.
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