Polycarbonate Optical Sheet with Metal Mixture for Infrared Shielding
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Solution Overview
Problem
Polycarbonate sheets used in outdoor structures have a low infrared shielding effect, leading to increased internal temperatures and sheet bending due to thermal expansion and shrinkage, and existing solutions like milky white sheets or infrared reflection films are either dirty, unproductive, or prone to peeling.
Innovation Solution
A multifunctional optical sheet composed of polycarbonate, a metal mixture of chrome, iron, and nickel, and a pigment, which provides superior infrared shielding without the need for a separate infrared reflection film or layer, manufactured through a simplified extrusion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an infrared reflection film is laminated on a polycarbonate sheet, then the infrared shielding effect is improved, but the manufacturing complexity increases due to separate lamination process
Solution Approach 1:
The patent combines the infrared shielding function with the polycarbonate sheet itself by incorporating infrared-reflective particles directly into the polymer matrix during extrusion. This merging of functions eliminates the need for separate lamination processes, reducing manufacturing complexity while maintaining effective infrared shielding.
Solution Approach 2:
The invention creates a composite material by dispersing infrared-reflective particles (such as metal oxides or metallic flakes) within the polycarbonate matrix. This composite structure provides inherent infrared shielding capability without requiring additional films or layers, thus simplifying the overall manufacturing process.
2Object-affected harmful factors
If an infrared reflection layer is coated on a polycarbonate sheet, then the infrared shielding effect is improved, but the productivity decreases due to separate coating process
Solution Approach 1:
The patent merges the infrared shielding functionality directly into the polycarbonate sheet manufacturing process by incorporating reflective particles during extrusion. This integration eliminates separate coating operations, thereby maintaining high production speeds and productivity while achieving effective infrared shielding.
Solution Approach 2:
The infrared shielding particles are incorporated into the polycarbonate material during the extrusion process itself, before the sheet is formed. This preliminary incorporation ensures that the shielding capability is built-in from the start, eliminating the need for subsequent coating or lamination steps that would reduce productivity.
3Object-affected harmful factors
If an infrared reflection layer is formed on a polycarbonate sheet, then the infrared shielding effect is improved, but the reliability decreases due to peeling and wear
Solution Approach 1:
The patent merges the infrared shielding function with the polycarbonate sheet substrate by embedding reflective particles within the polymer matrix. This integration ensures that the shielding capability becomes an integral part of the sheet itself, eliminating peeling and wear issues associated with separate surface layers, thereby significantly improving reliability and durability.
Solution Approach 2:
The invention creates a composite material where infrared-reflective particles are dispersed and embedded within the polycarbonate matrix. This composite structure provides inherent shielding capability that moves with the substrate, eliminating the adhesion problems and wear resistance issues that plague separate surface coatings, thus enhancing long-term reliability.
4Object-affected harmful factors
If a milky white polycarbonate sheet is used, then the thermal insulation effect is improved, but the appearance becomes unclean and dirty easily
Solution Approach 1:
The patent applies local quality by incorporating infrared-reflective particles selectively within the polycarbonate matrix to provide thermal insulation only in the infrared spectrum. This allows the sheet to remain transparent or translucent in the visible range, maintaining aesthetic appearance while achieving the desired thermal insulation effect through targeted spectral modification.
Solution Approach 2:
The invention utilizes color changes at the molecular/particle level by incorporating infrared-reflective particles that interact with infrared radiation while being transparent to visible light. This selective optical interaction provides thermal insulation without altering the visual appearance of the sheet, avoiding the unclean appearance associated with milky white sheets.
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
The solution effectively intercepts infrared rays, improving thermal insulation, preventing sheet bending, and maintaining visible light transmittance while enhancing productivity and extending the sheet's lifespan by avoiding peeling issues.
Implementation Method 1
a multifunctional optical sheet having a light shielding property, which includes polycarbonate, a metal mixture, and a pigment... which can improve visible light transmittance while intercepting infrared rays
Data Source
AI summary
A multifunctional optical sheet having a light shielding property is provided, which includes polycarbonate, a metal mixture, and a pigment. Since the metal mixture is composed of chrome, iron, and nickel, the visible light transmittance is improved, and the infrared rays are intercepted.