Laminated Polymeric Frames for Eyewear
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Solution Overview
Problem
Current manufacturing processes for eyeglass frames struggle to balance high aesthetic quality with mechanical performance and durability, as materials with high technical performance often compromise on aesthetic features, and vice versa, leading to products that are either aesthetically inferior or prone to wear.
Innovation Solution
A layered polymeric semi-finished product is created through a lamination process involving a thermoplastic polyurethane cohesion layer with in-depth aesthetic patterns, combined with other polymeric sheets that provide technical performance, using techniques like co-extrusion, block processes, and heat/pressure bonding to achieve both aesthetic and mechanical excellence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If materials with high technical performance (e.g., polyamide, polyurethane, polycarbonate) are used for eyeglass frames, then mechanical strength and durability are improved, but aesthetic quality deteriorates due to homogeneous material appearance and susceptibility to wear
Solution Approach 1:
The patent applies composite materials by creating a laminated structure consisting of a first layer (aesthetic material like cellulose acetate or cellulose propionate) and a second layer (technical material like polyamide, polyurethane, or polycarbonate). This composite structure allows the first layer to provide aesthetic quality with in-depth patterns while the second layer provides mechanical strength and durability, resolving the contradiction between aesthetic appearance and technical performance
Solution Approach 2:
The patent segments the eyeglass frame into multiple functional layers: an outer aesthetic layer for appearance and an inner technical layer for structural integrity. This segmentation allows each layer to be optimized for its specific function - the aesthetic layer can be thinner and more decorative while the technical layer provides the necessary strength and wear resistance
2Ease of manufacture
If surface finishing treatments (spraying, printing, colour coating) are applied to improve aesthetic appearance, then aesthetic quality is improved, but durability deteriorates because the thin surface layer is exposed to wear and substances that accelerate removal
Solution Approach 1:
Instead of applying a thin aesthetic coating over a technical substrate (which wears away), the patent inverts the structure by placing the aesthetic layer as the outermost layer and the technical layer underneath. This inversion protects the aesthetic features from wear while the technical layer provides structural support, eliminating the durability problem of surface treatments
3Ease of manufacture
If frame thickness is reduced to achieve lighter weight and more fashionable appearance, then aesthetic quality and comfort are improved, but mechanical strength deteriorates
Solution Approach 1:
The laminated composite structure allows for reduced overall thickness while maintaining mechanical strength because the technical material layer (second layer) provides structural integrity even at thin dimensions, while the aesthetic layer (first layer) can be made thin for fashion purposes without compromising overall strength
4Ease of manufacture
If complex and heterogeneous patterns are incorporated in depth to provide long-lasting aesthetic appearance, then aesthetic quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the pattern incorporation into the first layer during its formation process (via block process, extrusion, or lamination), separating the aesthetic pattern creation from the structural layer formation. This allows complex in-depth patterns to be created in the aesthetic layer without complicating the manufacturing of the technical layer, as they are produced independently and then laminated together
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 results in eyeglass frames with reduced thickness and cost that maintain high chemical and physical-mechanical performance while protecting aesthetic features from wear, applicable beyond eyewear to other sectors requiring both technical effectiveness and aesthetic appeal.
Implementation Method 1
by temperature and/or pressure addition suitable to reach the softening of said cohesion layer featuring aesthetic patterns
Data Source
AI summary
A manufacturing process of, and the relative laminated, polymeric semi-finished product are disclosed, the laminated, polymeric semi-finished product having in-depth aesthetic features, including at least two mutually welded layers by a lamination process with heat and/or pressure addition, wherein at least one of the layers is a thermoplastic material, in which the following steps are provided: providing a cohesion layer 100-500 micron thick, consisting of thermoplastic polyurethane, featuring in-depth aesthetic patterns; providing polymeric sheets with materials having a softening temperature above the one of the cohesion layer; and laminating at least one of the polymeric sheets at least partly transparent or translucent with the cohesion layer, by heat and/or pressure addition suitable to reach the softening of the cohesion layer featuring aesthetic patterns.