LCD Exposure for Pattern-Free Silk Screen Stencil Production
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Solution Overview
Problem
The silk screen printing process is hindered by the need for physical patterns to define ink passage areas, which increases time and cost in stencil production.
Innovation Solution
A system utilizing a transmissive liquid crystal display (LCD) panel to programmatically control ultraviolet light exposure on an ultraviolet sensitive emulsion-coated silk screen, eliminating the need for physical patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If physical patterns are used to define ink passage areas, then the silk screen stencil can be produced, but the time and cost for stencil production increase
Solution Approach 1:
The patent uses an LCD panel to create a digital copy of the desired image pattern, which then serves as the exposure mask for the emulsion coating. This eliminates the need for physical patterns (such as acetate sheets or mylar films) that would traditionally be used to define the stencil design. The digital image on the LCD panel is projected through the emulsion, allowing direct transfer of the pattern without intermediate physical masks.
Solution Approach 2:
The patent replaces the mechanical/physical pattern system with an optical/digital system. Instead of using physical pattern materials that require manual handling, alignment, and removal, the invention uses an LCD panel to project light patterns directly onto the emulsion-coated silk screen. This substitution of physical patterns with digital image projection significantly reduces production time and complexity.
2Ease of manufacture
If physical patterns are used to define ink passage areas, then the silk screen stencil can be produced, but the cost for stencil production increases
Solution Approach 1:
The LCD panel creates a reusable digital copy of the design that can be displayed multiple times without degradation. This eliminates the need to purchase, handle, and dispose of physical pattern materials for each stencil production run, reducing material costs and eliminating the need for expensive physical pattern storage and management systems.
Solution Approach 2:
By replacing physical pattern materials with digital image projection, the system eliminates costs associated with physical pattern manufacturing, storage, handling, and disposal. The LCD panel can be programmed with design data and reused indefinitely, significantly reducing the overall cost of stencil production compared to traditional physical pattern methods.
3Ease of operation
If physical patterns are used to define ink passage areas, then the silk screen stencil can be produced, but the overall process complexity increases
Solution Approach 1:
The digital image on the LCD panel serves as a direct template that can be easily changed by simply updating the digital data, eliminating the need to physically create, align, and remove pattern materials. This digital copying approach simplifies the operational process by allowing rapid design changes without physical intervention.
Solution Approach 2:
The patent replaces the multi-step physical pattern process (applying pattern material, aligning it with the silk screen, exposing through the pattern, then removing the pattern) with a direct digital projection method. The LCD panel projects the image directly onto the emulsion, eliminating the mechanical steps of physical pattern handling and significantly simplifying the overall production process.
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
Reduces time and cost associated with silk screen stencil production by enabling direct image transfer onto the stencil without physical patterns.
Implementation Method 1
activating an ultraviolet light source to generate ultraviolet light, and illuminating the substrate by passing the ultraviolet light through the LCD panel to the substrate
Implementation Method 2
The liquid crystal display (LCD) panel is positioned between the frame and the ultraviolet light source
Implementation Method 3
providing a substrate coated with an ultraviolet sensitive emulsion, and providing an image on an LCD panel. The method also includes activating an ultraviolet light source to generate ultraviolet light, and illuminating the substrate by passing the ultraviolet light through the LCD panel to the substrate
Data Source
AI summary
A system includes a frame, an ultraviolet light source, an LCD panel, and a computer. The frame is configured to retain a substrate to be converted into a silk screen stencil. The LCD panel is positioned between the frame and the ultraviolet light source. The computer is coupled to the LCD panel. The computer is configured to transfer image data to the LCD panel. The image data defines an image to be transferred to the substrate.