Angled-Slot Distribution Tool for Abrasive Particle Alignment
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Solution Overview
Problem
Existing methods for applying abrasive particles to a backing in abrasive article manufacturing result in random orientation and alignment, leading to inefficiencies and waste, and electrostatic coating is costly and not viable for all types of particles.
Innovation Solution
A distribution tool with multiple layers of angled walls and slots is used to orient and align abrasive particles, ensuring a majority are applied in a biased and aligned manner, reducing waste and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If drop coating technique is used to apply abrasive particles, then the application cost is low, but the spatial orientation of abrasive particles is entirely random leading to particle loss and inefficiency
Solution Approach 1:
The distribution tool segments the continuous stream of abrasive particles into discrete portions through multiple layers of walls and slots, controlling their placement individually. This segmentation allows random particles to be organized into aligned patterns while maintaining the simplicity of gravity-based drop coating, reducing particle loss without requiring expensive electrostatic equipment
Solution Approach 2:
The distribution tool acts as an intermediary device between the abrasive particle source and the backing. It introduces structured walls and slots that guide and orient particles during their fall, transforming random particle streams into aligned patterns on the backing while maintaining low-cost gravity-based application
2Manufacturing precision
If electrostatic coating is used to orient abrasive particles, then the spatial orientation is improved with particles standing erect, but the application cost increases and it is not viable for all particle types
Solution Approach 1:
The patent replaces the electrostatic field-based mechanical system with a passive mechanical structure consisting of walls and slots. This mechanical substitution achieves particle orientation through physical guidance rather than electrical forces, making the process viable for all particle types including large abrasive particles that are difficult to electrostatically coat
Solution Approach 2:
The distribution tool uses simple, inexpensive mechanical structures (walls and slots) rather than expensive electrostatic coating equipment. These passive mechanical components provide durable, reusable particle orientation without the high capital investment and maintenance costs associated with electrostatic systems
3Manufacturing precision
If electrostatic coating is used to apply abrasive particles, then the orientation in one direction is achieved, but it cannot consistently coat relatively large abrasive particles
Solution Approach 1:
The distribution tool provides universal particle orientation capability that works with all abrasive particle types and sizes. The mechanical wall and slot structure can accommodate varying particle dimensions without requiring adjustment of electrical parameters, making it adaptable to different particle materials including large particles that exceed electrostatic coating capabilities
4Ease of operation
If abrasive particles are applied with random orientation, then the application process is simple, but the abrasive efficiency is reduced due to particle loss
Solution Approach 1:
The distribution tool performs preliminary orientation action on abrasive particles during their application process. By pre-aligning particles through walls and slots before they contact the backing, the system ensures efficient abrasive orientation without requiring complex post-application processing or sacrificing operational simplicity
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 tool effectively aligns and orients abrasive particles, enhancing the abrasive efficiency of the coated abrasive article by reducing particle loss and ensuring consistent alignment.
Implementation Method 1
a bulk supply of the abrasive particles are fed through a hopper and fall onto the major face (e.g., onto or into the make layer precursor) under the force of gravity
Data Source
Figure 1
Figure 2A~2C
Figure 3A
AI summary
In methods and systems of making an abrasive article, abrasive particles are loaded to a distribution tool including a plurality of upper walls defining a plurality of spacing slots, and a plurality of lower walls defining a plurality of distribution slots. The spacing slots are open to the distribution slots, which are open to a lower side of the tool. The loaded particles are spaced and distributed from the distribution tool to a major face of a backing web below the lower side and moving relative to the tool in a machine direction. The upper walls space the particles in the machine direction. The particles distributed by the lower walls undergo an orientation sequence in which each particle is oriented into a column aligned along the machine direction. The upper walls can be disposed oblique to the lower walls. The upper and lower walls can have pointed upper portions.