Cellulose Particle Blasting for Substrate Color Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing paper recycling methods using blasting grits can damage the recording medium and introduce impurities, making it difficult to recycle the paper effectively.
Innovation Solution
A processing device using a powder of cellulose particles to remove color material from a substrate, minimizing damage and allowing for efficient recycling by suppressing impurities, with features like double-walled conduit construction, adjustable nozzle configurations, and a refrigerant to manage heat and improve removal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If blasting grit is used to remove color material from substrate, then color material removal efficiency is improved, but substrate damage occurs and impurities are introduced
Solution Approach 1:
The patent changes the material parameter of the blasting particles from traditional hard materials (sand, metal grit, glass grit) to cellulose particles. This parameter change allows the particles to be sufficiently hard to remove color material while being soft enough to prevent substrate damage, as cellulose has lower hardness than the substrate it processes.
Solution Approach 2:
The patent uses cellulose particles that have the same chemical composition as the substrate material. This homogeneity ensures that when particles remain on the substrate after processing, they do not constitute impurities, thereby solving the problem of introducing harmful impurities during the color removal process.
2Productivity
If harder blasting material is used to improve color material removal, then removal efficiency is improved, but substrate damage increases
Solution Approach 1:
The patent optimizes the hardness parameter of blasting particles by selecting cellulose, which has intermediate hardness between soft materials and traditional hard blasting grits. This parameter optimization enables effective color material removal while maintaining substrate integrity, avoiding the damage caused by overly hard particles.
3Productivity
If traditional blasting grit is used for color removal, then processing speed is improved, but recycling difficulty increases due to impurities
Solution Approach 1:
The patent uses cellulose particles that match the chemical composition of the substrate. This homogeneity ensures that residual particles from the blasting process are chemically identical to the substrate material and do not constitute impurities, thereby maintaining ease of recycling while achieving efficient color removal.
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 effectively removes color material from substrates without damaging them, enabling convenient recycling and producing high-quality recycled paper by using cellulose particles that do not introduce impurities, even if some particles remain.
Implementation Method 1
a refrigerant to be discharged along with the particles
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A processing device, a sheet manufacturing apparatus, a processing method, and a sheet manufacturing method that suppress damage to a substrate when removing color material from the substrate, and are useful for recycling the substrate after color material is removed, are provided. A processing device has a color material removal device including at least one discharge nozzle configured to discharge particles containing cellulose to a substrate holding color material, and remove the color material from the substrate. The color material removal device preferably has a double-walled conduit construction having an internal conduit and an external conduit in which the internal conduit is inserted, at least one of an opening to the internal conduit and an opening to the external conduit functioning as the discharge nozzle.