Multi-Material Coating Dispensing with Piston Volume Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing dispensing systems struggle with precise control over dispensing pressures for a wide range of liquid materials due to their differing rheological properties, requiring complex pressure control and high tolerance demands, and lack flexibility in switching between materials.
Innovation Solution
A multi-material dispensing system utilizing two separate liquid flow mechanisms, one being an imprecise pressure transfer dispenser and the other a piston transfer mechanism, with a modular design allowing easy replacement of consumable components and rapid switching between materials, and a coating apparatus using microwires to define the gap width for precise layer thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single dispensing apparatus is used for a wide range of liquid materials, then versatility is improved, but manufacturing precision deteriorates due to differing rheological properties requiring different dispensing pressures
Solution Approach 1:
The system changes the dispensing mechanism parameter from pressure-based to volume-based control. The piston dispenses material based on precise volumetric displacement rather than pressure control, allowing different materials with varying rheological properties to be dispensed with consistent precision without requiring pressure adjustments for each material type
2Manufacturing precision
If pressure control is tightened to improve dispensing precision, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The invention replaces the pressure control mechanical system with a volumetric displacement system. Instead of using complex pressure sensors, regulators, and feedback control mechanisms, the system uses a piston with known displacement volume to directly control the amount of material dispensed, simplifying the overall system while maintaining precision
3Productivity
If rapid switching between materials is implemented, then productivity is improved, but reliability deteriorates due to contamination risks
Solution Approach 1:
The system segments the dispensing function into separate disposable cartridges, each containing a specific material. This allows rapid switching between materials by simply replacing cartridges rather than flushing lines, while the sealed cartridge design prevents contamination between materials, maintaining reliability during frequent switching operations
Data Source
Figure 1
Figure 2A~2C
Figure 2D
AI summary
Systems and methods for dispensing liquid materials as may be used in applications for coating flexible films and the like. Such a film may be coated by dispensing a rheological material onto its surface while drawing the film through a gap between a pair of rollers. The gap defines the thickness of a layer of the material applied to the film and is maintained at a desired width by microwires positioned through the gap. Another film across the gap from that to which the rheological material is applied aids in the coating of the layer and a contact area of the second film may be adjusted relative to the gap, e.g., when changing materials or when the coating film becomes abraded or deformed.