| Abstract [eng] |
The nowaday's society is concerned about developing and consuming problems. In the last decade the interest of alternative materials that are less toxical for our environment is being encreased. It is believed that bacterial materials will reduce pollution and waste. Eventhough the bacterial cellulose has been known since XIXth century, its application in the clothing and textile industryis not widely analysed. In this paper the author analyses cellulose biofilm, The gel like material is obtained from the symbiosis of yeasts and acetic bacteria.The aim of the paper is to estimate the influence of storage conditions and duration on mechanical properties and thickness of kombucha biofilm, to analyses biofilm joints and to evaluate the opportunities to use investigated material in the industry of textile and clothing. The results show that in a constant temperature of 4 °C the biofilm of bacteria cellulose have better preserve the deformation properties and inhibit vinegar syndrome, although biomaterial aging can’t be completely stopped. The biofilm that was kept in controlled conditions lost their strength of 73% and their tensile stress was reduced 7 times in 20 days. The biofilm that was kept in a cold environment lost their strength by 24 % and measured tensile stress was less 2 times. Results proved that at higher drying temperature biofilm loses its elasticity and strength. Elongation of 28 % is estimated for samples dried at 25° C, 12 % for sample dired 50 °C and 9 % at 75 °C . It was determined that bacterial cellulose biofilm is sensitive in terms of preparation and storage. Experimental analysies was conducted to estimate properties of biomaterial joints without adhesive and with adhesive when drying temperature and pressure is changed. It was assessed that by increasing the temperature the strength of joints without adhesive decreases. It comes to the result that using starch for BC joints and drying temperature of 25 °C, the shear strength of joints exceeded 8.00 MPa and 14.00 % of elongation. The influence of pressure for biofilm joints is established. The highest stress of 30.61 MPa was discovered for the joints obtained by 0.06 Pa and 25 °C that is 6 times more than for joints obtained at the same temperature without pressure. |
