Intermittent Slurry Coating With Gas Ejection to Prevent Dragging
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Solution Overview
Problem
Existing coating devices experience dragging at the terminal end of intermittently discharged slurry, leading to poor shape accuracy in the formed coated sections.
Innovation Solution
A coating device with first and second die heads that intermittently discharge slurries and gas ejectors that direct gases perpendicular and parallel to the conveyance direction, respectively, to prevent dragging at the slurry terminal ends, ensuring high shape accuracy of coated sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If slurry is intermittently discharged from die head to form discontinuous coated sections, then productivity is improved by enabling selective coating patterns, but dragging occurs at the terminal end of discharged slurry causing poor shape accuracy
Solution Approach 1:
The patent applies pneumatic ejection of gas (air knife method) to the terminal end of intermittently discharged slurry. The gas ejector delivers a stream of gas that acts on the slurry terminal end to prevent dragging, thereby maintaining shape accuracy while preserving the intermittent coating pattern for productivity.
Solution Approach 2:
The gas ejector is positioned to deliver gas to the terminal end of the slurry before dragging can occur. By applying the gas stream in advance at the terminal end, the system prevents the harmful dragging effect from developing, thus maintaining coating precision during intermittent discharge operations.
2Manufacturing precision
If gas ejector is positioned close to die head to prevent dragging, then shape accuracy is improved, but device complexity increases due to additional components and positioning requirements
Solution Approach 1:
The gas ejector serves multiple functions: it prevents dragging at the slurry terminal end, defines the downstream boundary of the coated section, and works with the die head to achieve precise coating patterns. This multi-functionality justifies the additional component while maintaining overall system efficiency.
Solution Approach 2:
The patent employs a gas ejector (air knife) that uses pneumatic principles to create a focused gas stream. This pneumatic mechanism provides an effective and relatively simple way to prevent slurry dragging compared to mechanical alternatives, thereby limiting the increase in device complexity.
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 effectively prevents dragging, enhancing the shape accuracy of coated sections, particularly in the formation of positive electrode mixture and insulating layers, thereby improving the manufacturing of solid-state batteries.
Implementation Method 1
a first gas ejector that ejects a first gas toward a terminal end of the first slurry being intermittently discharged
Implementation Method 2
a first die head that intermittently discharges a first slurry toward a first surface region of the material-to-be-coated being continuously conveyed
Data Source
AI summary
There is provided a coating device including: a conveyer that continuously conveys a sheet-shaped material-to-be-coated; a first die head that intermittently discharges a first slurry toward a first surface region of the material-to-be-coated being continuously conveyed, to discontinuously form a first coated section; and a first gas ejector that ejects a first gas toward a terminal end of the first slurry being intermittently discharged, wherein the first die head has a slit-shaped first discharge port that discharges the first slurry in a direction substantially perpendicular to a convey direction of the material-to-be-coated in the first surface region and that extends in a width direction of the conveyer, the first gas ejector has: a slit-shaped first ejection port that ejects the first gas in a direction substantially parallel to the convey direction of the material-to-be-coated in the first surface region and that extends in the width direction of the conveyer.