Embossing:
- Two different embossing methods are utilized by GLT.
- Embossing optical pattern onto sourced polycarbonate film (Roll to Roll).
- Thin (0.2mm – 0.6mm thickness), flat, flexible light guides
- Pattern is added by large, heated roller, and the final part profile is created using a die cut process.
- Primarily used for keyboard, front-light and consumer display applications.
- Typically, suitable for small to medium sized products.
- Embossing optical pattern in line with extrusion of polycarbonate or PMMA/Acrylic.
- The Polycarbonate (PC) resin produces thin (0.2mm – 0.6mm thickness), flat, flexible light guides.
- The PMMA/Acrylic resin produces thicker (1.0mm – 4.0mm), flat, light guides.
- Pattern is added by large, heated roller and outline is created using a laser cutting process.
- Used for TVS, General Lighting and Monitor backlights.
- Sizes range from twenty (20) inch diagonal to one hundred (100) inch diagonal.
- Able to utilize different optical extraction features (on one or both sides):
- Laser
- Chemical Etch
- V-Groove
- Machined optical lenses.
- In addition to outline cutting/punching, a polishing process is typically used to improve surface condition of LED and surrounding edges.
- Both methods are stable with minimal part to part variation.
- Tight tolerance control.
- Optical insert produces repeatable performance.
- Both methods have high production capacity typically warranting larger MOQs.
- Light guides produced by embossing method contain no internal stresses (compared to injection)
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