Guayule Rubber Extraction via Hammer and Roller Milling
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Solution Overview
Problem
Non-Hevea plants store natural rubber within their cells, making it inaccessible for extraction through tapping, and existing methods do not effectively increase extractable rubber content without also increasing resin content.
Innovation Solution
The use of hammer milling and/or roller milling with specific parameters, such as screen sizes and moisture content, to process chopped non-Hevea plant matter, resulting in increased extractable rubber content through organic or aqueous extraction without significantly increasing resin content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional physical means are used to break down cell walls of non-Hevea plants, then rubber becomes accessible for extraction, but resin content increases unduly
Solution Approach 1:
The patent applies parameter changes by controlling moisture content at 10-15% and using specific screen sizes (less than 1/2 inch) in hammer milling, along with corrugated rolls having no more than 12 grooves per inch in roller milling. These specific parameter ranges optimize cell wall breakdown while minimizing resin release, resolving the contradiction between increasing rubber accessibility and controlling resin content.
Solution Approach 2:
The patent employs dynamic milling processes where hammer mills and roller mills with corrugated rolls create varying mechanical forces during processing. The combination of hammer impact and rolling compression with specific groove configurations creates dynamic stress patterns that selectively rupture rubber-containing cells while preserving resin-containing structures, thereby increasing extractable rubber without unduly increasing resin content.
2Quantity of substance
If hammer milling with small screen size is used, then extractable rubber content increases by at least 30%, but processing complexity increases
Solution Approach 1:
The patent merges hammer milling and roller milling with corrugated rolls into a single integrated processing step. By combining these two milling mechanisms in one operation rather than using them separately, the patent achieves the 30% increase in extractable rubber content while minimizing the increase in processing complexity. The combined process handles both size reduction and cell wall breakdown in one pass through the milling equipment.
3Productivity
If moisture content is kept at maximum 15 weight %, then rubber extraction efficiency increases, but processing conditions become more restrictive
Solution Approach 1:
The patent establishes a specific moisture content parameter range of 10-15 weight % as an optimal processing condition. By defining this narrow range, the patent maximizes rubber extraction efficiency through controlled cell wall permeability while accepting reduced flexibility in processing conditions. This parameter optimization ensures consistent extraction efficiency across different non-Hevea plant materials.
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
The method achieves a 30-100% increase in extractable rubber content while keeping resin content within acceptable limits, making it a more efficient process for extracting rubber from non-Hevea plant matter.
Implementation Method 1
subjecting the chopped non-Hevea plant matter to at least one of hammer milling utilizing a screen size of less than 1⁄2′′ and roller milling with corrugated rolls
Implementation Method 2
the resulting plant matter such as by organic solvent extraction or aqueous extraction
Data Source
AI summary
Methods for increasing the extractable rubber content of non-Hevea plant matter that entail the use of particular forms of hammer milling and/or roller milling in an increase in the amount of rubber that can be extracted from the resulting plant matter such as by organic solvent extraction or aqueous extraction are provided. In certain embodiments, the methods are for increasing the extractable rubber content of guayule plant matter, and entail the use of particular forms of hammer milling in combination with roller milling and flaking to increase the amount of rubber that can be extracted from the guayule plant matter such as by organic solvent extraction or aqueous extraction.