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The main purpose of this work is to investigate the penetration properties of knitted fabrics coated with silica nanoparticles to make protective gloves. Silica nanoparticles are well-known and useful for several applications. Hence, in the environment where glove material is exposed to harmful chemicals, hazards related to faster penetration of dangerous substances into the glove interior may cause needle-stick injuries and micro damage. One of the solutions to overcome this problem is to use knitted fabrics coated with acrylic pastes containing silica nanoparticles (average size 20 nm in diameter). To study the effectiveness of developed gloves for protection against needle-stick injuries, overall knitted fabrics with a similar structure (interlock) and differentiated raw material composition were selected: polyamide 6-6/elastane and polyester. Evaluation of the needle-stick injuries process of the coated plated knits based on silica nanoparticles was performed. For this purpose, the assessment of the surface morphology of materials has been examined before and after the dexterity and penetration process. The studied composite samples showed an increased resistance to hypodermic needle penetration as the nano-silica particles content and the coating layers increase. Coated knitted fabrics allowed us to obtain promising results in terms of fabric stiffness. However, the manual coating application explained the observed imperfections.

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The purpose of this study is to select an appropriate commercial neutral cellulase enzyme for denim garments bio-polishing to achieve specific industrial goals. A full factorial experimental design was used to evaluate the effect of factors considered in the optimization of the bio-polishing process (fabric ID: x1, treatment time: x2, treatment temperature: x3, enzyme concentration: x4, storage time: x5, inactivation step: x6 and enzyme type: x7). Experiments were conducted using laboratory washing machine. Subjective evaluation was performed at a pilot and at an industrial scale. Tear, tensile strength and subjective evaluation concerning hand feel, fabric color, indigo dye pocket back staining and fuzziness extent were evaluated. Results showed that x6 and x7 had significant effects on the fabric tear and tensile strength loss. In the optimization, the great dependence between observed and predicted tear strength and tensile strength loss, the correlation coefficient of the models (R 2 > 0.85) and the important value of F-ratio proved the validity of the models. Results showed that denim leg panels treated with the enzyme Lava-Cell NSZ presented a minimum loss of tear and tensile strength. A low-temperature and time enzymatic bio-polishing process was developed at industrial scale.

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