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Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?

2026-04-13

Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?

In the plastic extrusion industry, Polycarbonate (PC) is known as the "King of Plastics" due to its incredible impact resistance and transparency. However, PC has a "natural enemy": Ultraviolet (UV) radiation.

At GWELL, we often receive inquiries from customers asking how to prolong the lifespan of their PC endurance boards or sunshine boards in outdoor environments. The answer lies in UV Co-extrusion Technology.

1. The Challenge: Why PC Yellows and Becomes Brittle

Standard Polycarbonate is sensitive to UV light (wavelengths between 290-400nm). Long-term exposure to sunlight causes:

Yellowing: The clear sheet turns into an unattractive yellow over time.
Brittleness: The molecular chains break, causing the sheet to crack or lose its "unbreakable" property.
Reduced Light Transmission: This is a critical failure for greenhouses, skylights, and optical applications.

2. The Solution: GWELL’s Online UV Co-extrusion

Instead of adding UV stabilizers into the entire batch of raw material (which is extremely expensive and less effective), GWELL utilizes advanced multi-layer co-extrusion technology.

Precision Distribution: Our feedblocks allow a concentrated UV-protective layer (usually 30μm to 50μm) to be uniformly coated on one or both sides of the PC sheet.
"Armor" for the Sheet: This UV layer acts as a shield, absorbing the radiation before it reaches the core PC material.
Cost Efficiency: By concentrating the UV additives only on the surface, manufacturers can save significantly on raw material costs while achieving superior protection.

3. Technical Highlights of GWELL PC Lines

GWELL’s PC/PMMA extrusion lines are engineered to handle this process with high precision:

Stable Layer Ratio: Our specialized auxiliary co-extruders ensure the UV layer remains consistent, even at high production speeds.
Mirror-Surface Calendering: Ensures that the UV-coated surface is perfectly smooth, maintaining "Optical Grade" clarity without distortion.
10-Year Warranty Quality: Sheets produced on GWELL lines with proper UV co-extrusion can easily meet the 10-year anti-yellowing global standard.

4. Market Application

This solution is essential for customers producing:

Architectural Skylights & Canopies
Highway Sound Barriers
Outdoor Advertising Lightboxes
Agricultural Greenhouses

Conclusion

Investing in a PC sheet extrusion line with UV co-extrusion is not just an option—it is a necessity for entering the high-end international market. At GWELL, we provide the "Turn-key" solution to help you produce durable, high-quality sheets that stand the test of time and sun.

Get a Professional Quote Today

If you are looking for a reliable partner for PC/PMMA Optical Sheet & Board Production Lines, contact our expert Liam, for a customized solution.

Contact Person: Liam (GWELL)
Email: saled@gwell.cn
Tel/WhatsApp: +86 15906224102
Official Website: www.gwellmachine.com

Blog Details

Home Blog

Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?

1. The Challenge: Why PC Yellows and Becomes Brittle

Standard Polycarbonate is sensitive to UV light (wavelengths between 290-400nm). Long-term exposure to sunlight causes:

Yellowing: The clear sheet turns into an unattractive yellow over time.
Brittleness: The molecular chains break, causing the sheet to crack or lose its "unbreakable" property.
Reduced Light Transmission: This is a critical failure for greenhouses, skylights, and optical applications.

2. The Solution: GWELL’s Online UV Co-extrusion

Instead of adding UV stabilizers into the entire batch of raw material (which is extremely expensive and less effective), GWELL utilizes advanced multi-layer co-extrusion technology.

Precision Distribution: Our feedblocks allow a concentrated UV-protective layer (usually 30μm to 50μm) to be uniformly coated on one or both sides of the PC sheet.
"Armor" for the Sheet: This UV layer acts as a shield, absorbing the radiation before it reaches the core PC material.
Cost Efficiency: By concentrating the UV additives only on the surface, manufacturers can save significantly on raw material costs while achieving superior protection.

3. Technical Highlights of GWELL PC Lines

GWELL’s PC/PMMA extrusion lines are engineered to handle this process with high precision:

Stable Layer Ratio: Our specialized auxiliary co-extruders ensure the UV layer remains consistent, even at high production speeds.
Mirror-Surface Calendering: Ensures that the UV-coated surface is perfectly smooth, maintaining "Optical Grade" clarity without distortion.
10-Year Warranty Quality: Sheets produced on GWELL lines with proper UV co-extrusion can easily meet the 10-year anti-yellowing global standard.

4. Market Application

This solution is essential for customers producing:

Architectural Skylights & Canopies
Highway Sound Barriers
Outdoor Advertising Lightboxes
Agricultural Greenhouses

Conclusion

Get a Professional Quote Today

If you are looking for a reliable partner for PC/PMMA Optical Sheet & Board Production Lines, contact our expert Liam, for a customized solution.

Contact Person: Liam (GWELL)
Email: saled@gwell.cn
Tel/WhatsApp: +86 15906224102
Official Website: www.gwellmachine.com

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Blog Details

Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?

Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?

Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?

Why Does the PC Sheet Extrusion Line Need to Be Equipped with UV Co-extrusion?