Bast Fiber Decorticator with Split-and-Peel Rollers for Undamaged Fiber
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Solution Overview
Problem
Current automated decortication processes for separating hemp fiber from its inner woody core are aggressive, leading to damaged fibers and a tangled mess, which are not suitable for advanced composite applications.
Innovation Solution
A plant stalk decorticator with a frame, feed rollers, a splitting wedge, and peeling rollers that gently split and peel the plant stalk into undamaged fiber bark sections, using coordinated roller speeds and a movable splitting wedge to minimize damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If aggressive automated decortication processes are used to efficiently separate hemp fiber from hurd, then productivity is improved, but fiber quality deteriorates causing damage and tangling
Solution Approach 1:
The decortication process is divided into multiple sequential stages: initial crushing, fiber-hurd separation, and final fiber refining. Each stage uses differently configured rollers to progressively separate fibers without excessive force, maintaining quality while achieving efficient processing through staged decomposition of the stalk structure
Solution Approach 2:
The roller spacing, speed, and pressure are precisely controlled and adjusted based on the specific plant material being processed. By dynamically changing these parameters, the system adapts to different stalk densities and fiber characteristics, achieving both high productivity and consistent fiber quality without damage or tangling
2Productivity
If high-speed automated processing is used to increase output, then productivity is improved, but fiber damage increases reducing suitability for composite applications
Solution Approach 1:
The system employs dynamically adjustable roller speeds and pressures that respond to the feed rate and material characteristics. This dynamic control allows the processing speed to be optimized for productivity while automatically reducing force application when fiber integrity is at risk, preventing damage even during high-speed operation
Solution Approach 2:
The stalks are pre-crushed and softened before entering the main decortication zone, which prepares the fiber-hurd bonds for gentle separation. This preliminary action reduces the force needed during high-speed processing, enabling fast production rates without compromising fiber strength or creating damage
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
Produces undamaged natural fiber from bast fiber plants, suitable for advanced composite applications by minimizing fiber damage and maintaining fiber quality.
Implementation Method 1
a pair of feed rollers...configured to receive a plant stalk in the line of contact and at least partially flatten and feed the plant stalk
Implementation Method 2
a splitting wedge...configured to split the plant stalk fed from the pair of feed rollers into two halves
Implementation Method 3
peeling rollers...configured to receive a respective one of the plant fiber stalk halves and separate the plant fiber stalk half from the respective other one of the plant fiber stalk halves
Data Source
AI summary
A plant stalk decorticator includes a pair of feed rollers arranged abutting one another along a substantially horizontal axis with a line of contact therebetween. A splitting wedge is positioned at least partially below the pair of feed rollers and aligned along a substantially vertical axis that is substantially centrally located in the line of contact between the pair of feed rollers, the splitting wedge is configured to split a plant stalk fed from the pair of feed rollers into two plant fiber bark sections. Symmetrical pairs of vertically stacked peeling rollers are positioned below the pair of feed rollers and laterally from either side of the substantially vertical axis. Each of the pairs of peeling rollers are configured to receive a respective one of the plant fiber bark sections from the splitting wedge and separate the plant fiber bark section from the respective other one of the plant fiber bark sections.