Bimodal Powder Supply for Foreign Material Removal
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Solution Overview
Problem
Existing methods for recycling paper struggle to efficiently remove foreign materials from fiber-containing materials, leading to low removal rates and reduced processing efficiency.
Innovation Solution
A processing apparatus that supplies a mixture of first and second particles with different average diameters to the fiber-containing material, allowing for effective removal of foreign materials through a powder material supply and removal process, which includes defibrating and agitating the material to enhance deinking efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single type of powder material is used for removing foreign materials, then the processing is simple, but the removal rate of foreign materials is insufficient
Solution Approach 1:
The powder material is segmented into two distinct particle groups: first particles with smaller average particle diameter (0.01-10 μm) for penetrating and removing foreign materials from internal gaps between fibers, and second particles with larger average particle diameter (5-1500 μm) for removing foreign materials from external surfaces. This segmentation enables comprehensive removal of foreign materials at different locations, significantly improving the overall removal rate while maintaining processing efficiency.
2Productivity
If processing time is increased to improve foreign material removal rate, then more foreign materials can be removed, but processing efficiency is lowered
Solution Approach 1:
The invention changes the particle diameter parameter of the powder material to optimize removal efficiency. By using a bimodal distribution of particle sizes (first particles: 0.01-10 μm, second particles: 5-1500 μm), the system achieves high foreign material removal rates without requiring extended processing times. The smaller particles quickly penetrate and remove internal contaminants, while larger particles simultaneously address surface contaminants, reducing overall processing time compared to single-size systems.
3Manufacturing precision
If smaller particles are used to remove foreign materials from gaps between fibers, then internal foreign materials can be removed, but the kinetic energy of particles is reduced
Solution Approach 1:
The powder material functions as a composite system combining two particle size groups. The first particle group (smaller, 0.01-10 μm) provides the capability to access and remove foreign materials from internal gaps between fibers, while the second particle group (larger, 5-1500 μm) supplies sufficient kinetic energy for effective impact and removal. This composite approach allows each particle group to specialize in its optimal function, achieving both internal contamination removal and maintaining adequate particle force.
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 solution enables efficient removal of foreign materials from fiber-containing materials, improving the quality of the recycled paper and reducing processing time and costs by effectively removing contaminants from both the surface and internal gaps of the fibers.
Implementation Method 1
a powder material containing a first particle group consisting of a plurality of first particles, and a second particle group consisting of a plurality of second particles and having an average particle diameter larger than that of the first particle group, to a fiber-containing material
Data Source
AI summary
A processing apparatus includes a powder material supply portion that supplies a powder material containing a first particle group consisting of a plurality of first particles, and a second particle group consisting of a plurality of second particles and having an average particle diameter larger than that of the first particle group, to a fiber-containing material containing a fiber during or after defibrating, and a powder material removing portion that removes at least a portion of the powder material from the fiber-containing material supplied with the powder material. It is preferable that the processing apparatus include a defibrating portion that defibrates the fiber-containing material on an upstream side of the powder material supply portion.