Multi-Channel Slot Die Coating for Closely Spaced Reagent Films
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Solution Overview
Problem
Existing methods for applying reagents on a substrate face challenges such as limited flexibility, high cost, and inefficiency in placing multiple reagent films close together, leading to thicker layers, spreading, and mixing, which can affect test results.
Innovation Solution
A slot die apparatus with a shim having multiple channels allows simultaneous dispensing of multiple coatings onto a substrate, controlled by a vacuum system to maintain precise film widths and gaps, enabling uniform reagent application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a thin shim with multiple openings is used to dispense multiple reagent films, then the number of reagent films that can be placed on the substrate increases, but the structural integrity and strength of the shim deteriorates
Solution Approach 1:
The patent implements a nested structure where multiple shim layers are stacked within a single slot die head. Each shim layer contains openings for specific reagent films, and the shims are arranged in a nested configuration where they support each other structurally. This allows multiple reagent films (more than two) to be dispensed simultaneously while maintaining the structural integrity of each individual shim layer, as they are reinforced by the surrounding shims in the nested arrangement.
2Strength
If openings in the shim are positioned far apart to maintain structural integrity, then the shim strength is maintained, but the distance between corresponding reagent films on the substrate increases
Solution Approach 1:
The nested shim arrangement allows openings to be positioned closer together on each individual shim layer, because the surrounding nested shims provide structural support. This reduces the distance between openings on the same shim, and consequently reduces the distance between corresponding reagent films on the substrate, while still maintaining overall structural integrity through the nested configuration.
Solution Approach 2:
The patent transitions from a two-dimensional problem (positioning openings on a flat shim) to a three-dimensional solution by stacking multiple shim layers in the vertical dimension. This allows the openings to be distributed across multiple layers rather than requiring large horizontal spacing on a single layer, thereby reducing the distance between reagent films on the substrate while maintaining structural integrity through the vertical nesting arrangement.
3Adaptability or versatility
If more than two openings are included in the shim, then more reagent films can be dispensed, but maintaining structural integrity and workable distance among reagent films becomes more problematic
Solution Approach 1:
The nested shim structure provides a scalable solution for including more than two openings. Each additional reagent film can be accommodated by adding another opening on an existing shim layer or by adding a new shim layer to the nested arrangement. The nested configuration inherently maintains structural integrity and appropriate spacing, as each shim layer supports the others, making it easier to manage complexity compared to attempting to fit all openings on a single thin shim.
4Area of stationary object
If slot die coating head is used to dispense contiguous reagent film, then wide area coverage is achieved, but the ability to place multiple reagent films within small area is lost
Solution Approach 1:
The slot die head is segmented into multiple independent shim layers, each with its own openings for dispensing specific reagent films. This segmentation allows each shim layer to control the placement of specific reagent films in discrete areas, enabling multiple reagent films to be placed within a small area on the substrate. The segmented structure maintains the advantages of slot die coating while adding the versatility to place multiple distinct reagent films in close proximity.
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
Achieves consistent and uniform application of reagent films with controlled thickness and gap widths, reducing cross-reactivity and diffusion, and improving test accuracy.
Implementation Method 1
A slot die apparatus with a shim having multiple channels allows simultaneous dispensing of multiple coatings onto a substrate, controlled by a vacuum system to maintain precise film widths and gaps
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A slot die shim for use with a slot die, the slot die shim including a first channel configured to receive a first coating, a second channel configured to receive a second coating, and a third channel configured to receive a third coating. The slot die shim simultaneously dispenses the first coating through the first channel, the second coating through the second channel, and the third coating through the third channel onto a substrate. The coatings can be applied at different flow rates and include different test reagents. A vacuum force is applied to the first, second, and third coatings to control a width and a thickness of each of the coatings and a gap or distance between the coatings. The first, second, and third coatings are placed near one another or directly in contact with one another to minimize the area required for the coatings.