Co-Extruded Window Profiles With UV-Stable Recycled Surfaces
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Solution Overview
Problem
Recycled plastic material used for exterior surfaces of plastic extrusion profiles is not as durable as raw plastic, particularly lacking resistance to external influences like UV radiation, and has aesthetic limitations.
Innovation Solution
A co-extrusion process is used to create an extrusion profile with at least one surface made of recycled plastic material, incorporating a thin layer of lightfast pigment to enhance durability and resistance to external factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recycled plastic material is used for exterior surfaces of extrusion profiles, then environmental sustainability is improved, but durability and resistance to external influences (especially UV radiation) deteriorates
Solution Approach 1:
The patent applies different material qualities to different parts of the extrusion profile. The exterior surfaces receive a special coating containing UV stabilizers and pigments, while the interior can use standard recycled plastic material. This localized application of protective qualities allows the use of recycled material throughout while protecting only the UV-exposed surfaces.
Solution Approach 2:
The patent creates a composite structure by combining recycled plastic material with a protective coating layer. The coating contains UV stabilizers, pigments, and other additives that provide the necessary protection against external influences. This composite approach allows the base material to be recycled plastic while the coating provides enhanced durability.
2Object-affected harmful factors
If pigmentation is added to recycled plastic material, then lightfastness and UV resistance are improved, but profile strength and impact resistance deteriorate
Solution Approach 1:
The pigmentation and UV stabilizers are concentrated in the protective coating layer applied to the exterior surfaces, rather than being distributed throughout the entire profile. This localized concentration provides maximum lightfastness and UV resistance where needed while minimizing the impact on overall profile strength.
Solution Approach 2:
The patent optimizes the concentration and type of pigments and stabilizers in the coating to achieve the necessary lightfastness with minimal amounts. By carefully controlling the parameters of the coating formulation and application thickness, the patent achieves protection without excessive pigment loading that would compromise strength.
3Adaptability or versatility
If recycled plastic material is used for visible surfaces, then aesthetic limitations are overcome, but durability under external influences deteriorates
Solution Approach 1:
The protective coating with UV stabilizers and pigments is applied specifically to the exterior visible surfaces, allowing the recycled plastic material to provide aesthetic versatility while the coating provides durability protection where environmental exposure occurs.
Solution Approach 2:
The combination of recycled plastic material with a specialized protective coating creates a composite structure that merges the aesthetic benefits of recycled material with the durability of protected surfaces, enabling use in visible exterior applications.
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 extrusion profile achieves sufficient strength and resistance to impact while maintaining durability and aesthetic appeal, with improved lightfastness and UV resistance, using a minimal amount of pigmentation.
Implementation Method 1
Coextrusion refers to the combining of two identical or different polymer melts before they exit the extrusion die (nozzle), wherein the two polymer melts are produced by two separate extrusion lines and combined in the extrusion die (nozzle) to form a workpiece
Data Source
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AI summary
The present invention relates to an extrusion profile (1), in particular a co-extrusion profile or a mono-extrusion profile, for a window and/or door part, in particular a window and/or door frame part or a window and/or door sash part, wherein at least one profile surface forming an outer surface (2) of the extrusion profile is made of at least recycled plastic material and is provided with at least one pigmentation comprising at least one lightfast pigment.