Animal Hide Dehairing Enzyme Sequence
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Solution Overview
Problem
Current methods for preparing animal hides for chrome tanning are inefficient in removing hair and non-leather forming substances, leading to suboptimal leather quality and processing times.
Innovation Solution
Treating animal hides with a sequence of enzymes and polysulfides, including glycosylase, peptidase, and esterase enzymes, along with pH-modifying agents and soaking agents, to break down and remove hair and other substances, followed by agitation in a controlled environment to enhance penetration and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional single-enzyme dehairing methods are used, then the process is simpler and faster, but hair and non-leather forming substances are not effectively removed
Solution Approach 1:
The dehairing process is segmented into multiple sequential enzyme treatments, each targeting different aspects of hair and non-leather forming substance removal. The first enzyme treatment removes initial contaminants, the second enzyme treatment addresses remaining substances, and the polysulfide treatment completes the removal process. This segmentation allows each treatment to be optimized for its specific function, achieving comprehensive hair removal that single-enzyme methods cannot accomplish.
2Reliability
If multiple enzyme treatments are applied sequentially, then hair removal effectiveness is improved, but processing time increases
Solution Approach 1:
The first enzyme treatment performs preliminary action by removing initial contaminants and preparing the hide surface for subsequent treatments. This preliminary removal of bulk contaminants reduces the workload for subsequent enzyme treatments, allowing them to focus on more difficult-to-remove substances. The polysulfide treatment is applied in advance or in conjunction with enzyme treatments to swell the hide and facilitate penetration, thereby reducing the time required for effective hair removal.
Solution Approach 2:
The multiple enzyme treatments are applied in continuous sequence without idle time between steps. Each treatment builds upon the previous one, with the second enzyme treatment immediately following the first, and polysulfide treatment following or overlapping with enzyme applications. This continuous application ensures that the hide is constantly being treated and processed, maximizing the efficiency of each treatment step and minimizing total processing time despite the multiple stages involved.
3Reliability
If aggressive chemical methods are used for dehairing, then hair removal is more effective, but damage to the hide and leather quality increases
Solution Approach 1:
The patent replaces aggressive mechanical and chemical dehairing methods with a multi-enzyme biological system. Instead of using strong alkalis, oxidizing agents, or mechanical scraping that can damage hide tissue, the process uses specifically selected enzymes that selectively break down hair and non-leather forming substances while leaving the collagen structure intact. The enzyme treatments are mild yet effective, achieving complete hair removal without the harmful side effects of conventional aggressive methods.
Solution Approach 2:
The process optimizes multiple parameters including pH levels, temperature, treatment time, and enzyme concentrations for each treatment stage. The pH is carefully controlled to match the optimal range for each enzyme's activity, maximizing their effectiveness while minimizing tissue damage. Treatment times and temperatures are adjusted to ensure complete hair removal while preserving collagen integrity. The polysulfide treatment parameters are optimized to swell the hide sufficiently for enzyme penetration without over-softening or damaging the structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method improves the removal of hair and non-leather forming substances, resulting in higher quality leather with enhanced softness, flexibility, and uniform thickness, thereby optimizing the chrome tanning process.
Implementation Method 1
treating the hide with a first enzyme, and thereafter, the step of treating the hide with a second enzyme
Implementation Method 2
the step of treating the hide with a polysulfide
Implementation Method 3
followed by agitation in a controlled environment to enhance penetration and removal
Data Source
AI summary
Methods for preparing an animal hide for chrome tanning are provided. In particular, one or more embodiments include treating the hide with a first enzyme, a second enzyme, and a polysulfide. This treatment facilitates improved removal of hair from the hide. Furthermore, one or more embodiments include various combinations of treating the hide with a third enzyme, a liming agent, a pH-modifying agent, one or more sulfides, and one or more soaking agents. In addition, one or more embodiments include sanitizing the hide and liming the hide to further facilitate the processing of the animal hide into leather.