Short Term Preservation of Skins with Acids
The wet salting method, which is mostly used for hide or skin curing employs approximately 40-50% sodium chloride on raw material weight, this salt is subsequently removed during soaking thus significantly increasing pollution in tannery wastewaters. The application of alternative short term preservation methods can lead to a substantial decrease in materials consumption.
Treatment with a mixture of acetic and benzoic acids is proposed as a short term preservation method for pigskins. Preservation for 16 days at 22 +/- 1 degrees C was achieved.
The changes in the preserved skin structure during treatment and storage have no influence on the processed leather's chemical and strength properties, which are on a par with the properties of leather produced from pigskins preserved by the salting.
Available from: ncbi.nlm.nih.gov
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ABSTRACT: The objective of this work was to investigate vacuum influence on hide preservation time and how it affects hide structure. It was established that vacuum prolongs the storage time without hide tissue putrefaction up to 21 days when the storage temperature is 4 degrees C. The microorganisms act for all storage times, but the action is weak and has no observable influence on the quality of hide during the time period mentioned. The hide shrinkage temperature decrease is negligible, which shows that breaking of intermolecular bonds does not occur. Optical microscopy, infrared spectroscopy and differential scanning calorimetry also did not show any structural changes which can influence the quality of leather produced from such hide. The qualitative indexes of wet blue processed under laboratory conditions and of leather produced during industrial trials are presented. Indexes such as chromium compounds exhaustion, content of chromium in leather, content of soluble matter in dichloromethane, strength properties, and shrinkage temperature were determined. Properties of the leather produced from vacuumed hide under industrial conditions conformed to the requirements of shoe upper leather.
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ABSTRACT: Brine curing using sodium chloride is widely used for the short-term preservation of cattle hides. Due to economics and efficiency, it has become the traditional method of hide preservation used by meat packers, hide processors and tanners worldwide. But brine curing is known to cause serious effluent pollution problems in the environment. The main objective of the current study was to develop an alternative brining process that requires less salt to effectively preserve bovine hides by incorporating dehydrating agents. In low salt preservation, the anticipated hardening effect due to over dehydration caused by polyethylene glycol (PEG) polymers was compensated by adding crude glycerol and sodium carbonate. Low molecular weight PEGs were more effective than high molecular weight polymers. Preservation was found to be effective because no sign of putrefaction was observed in alternatively cured hides, and the properties of these hides were comparable to those of traditionally preserved hides. When PEG was incorporated, the salt concentration required for hide preservation could be reduced.
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