Papers by Keyword: Non-Woven Fabric

Abstract: This article studies the recycling of medical masks by the extrusion method. The main mechanical and physicochemical properties of recycled medical masks have been researched. It was revealed that the processed medical masks contain high physical and mechanical properties. The article shows the introduction of recycled masks leading to an increase in the manufacturability of the homo-and a block copolymer of polypropylene. In the case of a block copolymer, an increase in elastic-strength properties is observed. The introduction of recycled masks does not significantly affect the thermophysical properties of the homo-and a block copolymer of polypropylene.

Abstract: The paper uses waste from the production of synthetic rubbers, industry, various clays for effective ways to solve the socio-economic and environmental problems of preserving natural resources and preventing environmental pollution. The construction materials industry faces the most important task-the search for non-deficit raw materials that allow partially or completely eliminate expensive conditioned polymers, rubbers and obtain cheaper mastic roofing materials while maintaining their high physical, mechanical and operational properties. Thermomechanical curves of composite materials based on synthetic rubbers with additives were studied. It is shown that the softening of samples of roofing materials No. 325 and No. 326 begins at , 20 % deformation is achieved, respectively, at – (No. 325) and + (No. 326), a sharp increase in deformation is observed, respectively, with a loss of strength: 40 % (No. 325) and 20 % (No. 326). Based on these materials, reinforced mastic roofs have been developed, which have low values of crack resistance. The coefficient of water resistance depends on the base, i.e. the reinforcing materials.

Abstract: Continuous fibre reinforcements in thermoplastic composites require an enhanced adhesion to the matrix component, in order to effectively divert external forces from the matrix. Therefore different silanes as adhesion promoters are used as a part of the sizing. They operate as a connector to the matrix component. These silanes affect the sliding properties of the sizing during the production of the glass filaments in a negative way, in which case the proportion of the adhesion promoter in the sizing must be kept at a low level in order to maintain the processing speed in the textile production process. With the immersion bath method, it was examined whether the treatment of the surface of textile fabric after the textile production process with a silane-containing aqueous solution could solve these problems. Different silane concentrations and solvents were considered. After drying the textiles were processed during a two-step pressing process directly into a multi-layer organic sheet with a textile-based polypropylene matrix. The successful layering of the adhesion promoter on the glass fibre surface was verified by Fourier transform infrared (FTIR) spectroscopy. With thermogravimetric analysis (TGA), the thermal resistance of the adhesion-promoting layer for the subsequent pressing process could be shown. In order to examine the influence of the layer on the fibre/matrix adhesion within the composites, the Young’s modulus and flexural modulus of the composite panels were determined. Impact experiments were made to measure the required penetration energy and the energy absorption capacity of the composite panels. An optimum for the amount of adhesion promoter could be found. Exceeding the optimum amount of adhesion promoter in the solution led to a decrease in the mechanical properties of the composite.

Abstract: Samples of polypropylene (PP), polyethylene (PE),polyester (PET), polylactide (PLA), and viscose (CV) non-woven fabrics, were exposed to blowing hot oven at 110°C temperature conditions separately for different times. In order to determine the state of thermal oxidation degradation, samples were examined by Tensile Properties, Scanning Electron Microscopy, Fourier Transform Infrared (FTIR) spectroscopy and Differential Scanning Calovimotry (DSC). These methods can be used to study and evaluate the sample thermal oxidation degradation.

Abstract: Samples of polypropylene (PP), polyester (PET) and polylactide (PLA) non-woven fabrics were exposed to carbon arc light in a covered chamber at 65°C and 50% relative humidity for different times. In order to determine state of degradation, samples were examined by Tensile Properties, Scanning Electron Microscopy, Fourier Transform Infrared (FTIR) Spectroscopy and Differential Scanning Calovimotry (DSC) curves, and then were evaluated by retention rate of Tensile strength and Elongation , appearence changes on fabric and fiber, infrared spectra and melting point changes. Its observed that PP is more vulnerable to photodegradate than PET and PLA non-woven fabrics. Photosensitizer is crucial for samples photodegradation. Mechanical properties are used to examine photodegradation for PP, PET, PLA, and melting point changes could evaluate photodegradation for PP, PET. SEM observation can make qualitative evaluation, and Transform Infrared Spectroscopy might evaluate photodegradation for PP.

Abstract: With the development of automotive industry, automotive air-conditioning filter became the essential equipment in people’s daily life. On today’s market, there is half of the filtration equipment made from non-woven materials because of its small resistance, good filtration efficiency, high yield and low cost advantages. In this paper, based on the comparison and analyses of the web structure, fiber distribution and finesse, permeability, thickness and filtration efficiency of the newly developed nonwoven composites and other imported materials, the results were got that the finer fibers, more porosity, thinner thickness and smaller holes together would make an ideal filtering product for using in the cleaner car.

Abstract: In order to study the effects of laminated structure on acoustic insulation property of composites, the frequently-used flexible polyvinyl chloride (EPVC) sheets and non-woven fabric were selected as the substrate materials to prepare for ten types of nonwoven fabric/EPVC composites with different laminated structures in this study. Their acoustic insulation properties were tested and analyzed by the double channel acoustic instrument. The results showed that the different laminated order of composites has significant influence on its acoustic insulation property under the same conditions; and the acoustic insulation property of composites can be improved by the change of laminated order only.

Abstract: Previous studies have indicated that Chinese fir glulam has many defects on surface: color is singleness, knot is more, surface is roughness, etc. This paper presents a study on the manufacturing technology of sliced bamboo veneer-Chinese fir glulam composite panel. Sliced bamboo veneer were glued on both the top and bottom surface of Chinese fir glulam. The results showed: (1)sliced bamboo veneer can beautify the surface of Chinese fir glulam; (2)sliced bamboo veneer should directly overlay on the surface of Chinese fir glulam, and it is not suitable back lining non-woven fabric in gluing; (3)the optimal composite technological parameters are: unit pressure: 0.7MPa; hot pressing temperature: 100°C; hot pressing time: 4min.

Abstract: The wheat straw was pretreated using heat-treatment and water action and then diversified flat weave experiments were performed. Effects of the technology of knitting (including machinery spinning method, sewing spelling method, weaving process of "picks one pressures one" and "picks two pressures two") on veneer material quality and technology of decorative facing was investigated. The results show that both of sewing spelling method and weaving process of "pick two pressure two" achieve better effect with close construction, level, nice appearance and simple to weave. Experiments for optimizing the technology were performed by using non-woven fabric as the laminated veneer materials, The optimal technical parameters when using non-woven fabric were as follows: MDI 1.5％ and UF 8％ with the dosage of 50-80g/m2; temperature of 85-105°C; pressure of 0.2-0.5 MPa; time of 25min(10 sheet at a time).

Abstract: Poly(lactic-co-glycolic)acid and silica gel fibers mixed non-woven fabric was made by electro-spinning method for the potential application as a bone grafting material. The silica gel, the source material for electro-spinning, was prepared by the hydrolysis of tetraethyl orthosilicate in the presence of calcium salt, water, hydrochloric acid and ethanol. Poly(lactic-co-glycolic)acid solution was prepared by dissolving it in the hexafluoroisopropanol. Then, they were transferred to two separate syringes which were connected to the high voltage supply generating a high electric field between the spinneret and the ground collecting drum. The silica gel containing calcium and poly(lactic-co-glycolic)acid solution were spun together under the electric field of 2 ㎸/㎝. The FE-SEM observations showed that the silica gel and poly(lactic-co-glycolic)acid fibers were mixed together completely and its handling property was much improved compared to that of the non-woven silica gel fabric. After soaking in the SBF for 1 week, low crystalline apatite crystals were also observed to occur on the silica fiber surfaces first and then they were also observed to occur on the poly(lactic-co-glycolic)acid fiber surfaces. From the results, it can be concluded that the poly(lactic-co-glycolic)acid and silica gel fibers mixed non-woven fabric made by electro-spinning method has a bioactivity. It means it has a potential to be used as a bone grafting material because of its apatite-forming ability, high surface area to volume ratio and high porosity.