Fine Paper Powder Production via Vertical Roller Mill
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Solution Overview
Problem
Existing resin compositions containing large-sized crushed paper particles disrupt the smooth flow of resin compositions during injection molding, leading to filling failures and poor pattern transferability, making it difficult to produce high-quality molded products with good yield.
Innovation Solution
A method involving two vertical roller mills with specific groove angles and configurations is used to produce fine paper powder with a particle diameter of less than 50 μm, ensuring efficient pulverization and maintaining a low environmental impact, which is then mixed with a resin for improved molding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large-sized crushed paper particles (0.5 mm to 5 mm) are used in resin compositions, then the environmental impact is low and material utilization is high, but the fluidity of the resin composition deteriorates and filling failures occur
Solution Approach 1:
The invention changes the particle size parameter of paper from large-sized (0.5-5 mm) to fine powder (50 μm or less), fundamentally altering the physical state to resolve the contradiction between environmental benefits and processing fluidity
Solution Approach 2:
The invention replaces traditional mechanical crushing methods with a jet mill system that uses compressed gas or steam to achieve fine pulverization, substituting mechanical force with fluid dynamic forces to obtain particles of 50 μm or less without fiber entanglement
2Ease of manufacture
If paper is pulverized using traditional crushing machines (rod mill, ball mill, pan mill, pin mill), then the pulverization process is simple, but the particle diameter cannot be reduced below approximately 100 μm and fibers become intertwined
Solution Approach 1:
The invention replaces mechanical crushing systems (rod mill, ball mill, pan mill, pin mill) with a jet mill system that uses compressed gas or steam jets to pulverize paper, achieving particle sizes of 50 μm or less without fiber entanglement by substituting mechanical force with fluid dynamic forces
Solution Approach 2:
The invention changes the pulverization mechanism from mechanical contact-based crushing to gas/steam jet-based pulverization, fundamentally altering the physical process to achieve finer particle size control and prevent fiber intertwining
3Productivity
If vertical roller mill with grooves is used for pulverization, then the pulverization efficiency is high, but the grooves become clogged with fine paper powder
Solution Approach 1:
The invention replaces the vertical roller mill mechanical system with a jet mill system using compressed gas or steam, eliminating the groove structure that causes clogging while maintaining high pulverization efficiency through fluid dynamic forces
Solution Approach 2:
The invention introduces compressed gas or steam as an intermediary medium to perform pulverization, replacing direct mechanical contact between rollers and paper, which prevents fine powder from adhering to surfaces and causing clogging
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 enables the production of high-quality molded products with good yield by ensuring excellent transferability and reducing environmental impact, while preventing clogging and maintaining efficient pulverization efficiency.
Implementation Method 1
pulverizing coarsely ground paper powder to obtain fine paper powder... using a vertical roller mill equipped with a plurality of pulverizing rollers
Implementation Method 2
pulverizing coarsely ground paper powder to obtain fine paper powder... using a vertical roller mill equipped with a plurality of pulverizing rollers
Data Source
AI summary
Coarsely shredded paper powder is pulverized using a first vertical roller mill equipped with a plurality of first pulverizing rollers 15 to obtain a fine paper powder having an average particle diameter of 50 μm or greater and less than 150 μm. Then, such a fine paper powder is further pulverized using a second vertical roller mill equipped with a plurality of second pulverizing rollers 25 to obtain a fine paper powder having an average particle diameter of 25 μm or greater and less than 50 μm. Concerning the inclination angle θ1 of grooves 15a, 25a with respect to axes L of rotation of said first and second pulverizing rollers, an angle of inclination θ1 of the first pulverizing rollers 15 is smaller than an angle of inclination θ2 of the second pulverizing rollers 25. Accordingly, the fine paper powder can be produced without incurring a substantial environmental impact.