| Abstract [eng] |
Various methods of neutralization of hide unhaired with sodium silicate and sodium sulphide have been investigated seeking to reduce or refuse ammonium sulfate conventionally applied for the neutralization. Due to the high release of ammonia into the environment, alternative materials are being sought that do not impair the properties of the hide being processed and that a high-quality chromed semi-finished product of leather can be obtained. In the research, different methods of hide neutralization and their influence on subsequent hide treatment processes qualitative indexes of the leather obtained are analyzed and described. It has been found that after unhairing with sodium silicate and sodium sulphide hide is appropriate to neutralize and bate the hide by adding 1 % ammonium sulphate, 0,8 % lactic acid and 0,15 % proteolytic enzyme preparation Oropon ON2. To obtain the best quality of chromed semi-finished product of leather, it is advisable to pickle the hide using 1 % sulfuric acid. In this way, neutralized-bated, pickled and chromed leather‘s quality meets the quality requirements for chromed semi-finished product of leather. |
