Dehairing and fiber opening process for complete elimination...

Leather manufactures – Processes

Reexamination Certificate

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Reexamination Certificate

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06957554

ABSTRACT:
The use of lime and sodium sulfide in leather making creates a lot of environmental concern. However, there is no commercial beam house process that could totally eliminate the use of lime and sodium sulfide. In this invention, a novel bio-chemical process has been standardized employing specific enzymes and non-toxic chemical that could totally eliminate the use of lime and sodium sulfide in leather processing. It has been found that the extent of hair removal and opening up of fiber bundles is comparable to that of the conventional limed leathers. Performance of the leathers is shown to be on par with conventionally leathers. The process also enjoys reduction in chemical oxygen demand and total solids load compared to conventional process.

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patent: 4960428 (1990-10-01), Christner et al.
patent: 5834299 (1998-11-01), Andersen
patent: 5885302 (1999-03-01), Leuck
patent: 5900027 (1999-05-01), Geihsler et al.
patent: 6708531 (2004-03-01), Thanikaivelan et al.

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