LDS Polyamide Molding with Segmented Surface Layer
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Solution Overview
Problem
Existing methods for producing thermoplastic moldings with integrated conductor tracks face challenges such as impaired mechanical properties due to the distribution of laser-direct-structurable metal compounds throughout the material, and difficulties in maintaining topology precision during processing.
Innovation Solution
A process involving extruded thermoplastic polyamide moldings with a laser-structurable surface layer containing a limited amount of LDS additive, allowing for localized conductor track formation and improved adhesion without compromising mechanical properties, and the use of a thermoplastic carrier element for enhanced flexibility and planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser-direct-structurable metal compounds are distributed throughout the thermoplastic material, then localized conductor track formation is enabled, but mechanical properties are impaired
Solution Approach 1:
The patent divides the thermoplastic molding into different zones with respect to LDS additive distribution: a surface layer containing the laser-direct-structurable metal compounds for conductor track formation, and an interior bulk material free of these compounds to maintain mechanical properties. This spatial segmentation resolves the contradiction by localizing the functional requirement to only where needed.
Solution Approach 2:
The invention implements local quality by concentrating LDS additives exclusively in the surface layer of the thermoplastic molding, while the interior remains free of these additives. This creates a non-uniform distribution where the surface possesses laser structurability for conductor tracks, while the bulk maintains optimal mechanical strength and toughness.
2Reliability
If LDS additive proportion is increased to improve metallization, then metallization quality is enhanced, but mechanical properties are compromised
Solution Approach 1:
The patent segments the LDS additive distribution into a concentrated surface layer for metallization and an additive-free interior for mechanical strength. This allows the surface to achieve high metallization quality with sufficient LDS additive concentration without compromising the bulk material's mechanical properties.
Solution Approach 2:
The invention applies local quality by varying the LDS additive concentration spatially: high concentration in the surface layer to ensure reliable metallization and conductor track formation, and zero concentration in the interior to preserve mechanical strength and toughness.
3Manufacturing precision
If topology precision is maintained during processing, then conductor track accuracy is improved, but processing flexibility is reduced
Solution Approach 1:
The patent incorporates laser-direct-structurable metal compounds into the thermoplastic material during the molding process itself, preparing the material in advance for subsequent laser structuring. This preliminary action enables accurate conductor track formation while maintaining processing flexibility, as the material is pre-conditioned but not pre-structured.
Solution Approach 2:
The LDS-containing thermoplastic material acts as an intermediary between the molding process and the laser structuring process. It carries the metal compounds that will later form conductor tracks, enabling a two-stage process that combines the flexibility of injection molding with the precision of laser direct structuring.
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 enables the production of moldings with high tensile strength, elongation, and toughness, allowing for flexible foils with well-adhered conductor tracks and maintaining planarity throughout production and metallization, while reducing the overall amount of LDS additive required.
Implementation Method 1
laser-structurable surface layer containing a limited amount of LDS additive, allowing for localized conductor track formation
Implementation Method 2
The metal seeds come about by breakdown of metal compounds present in ultrafinely divided form in the carrier material
Implementation Method 3
a metal layer grows in chemically reductive metalizing baths
Data Source
AI summary
A method for producing a laser-structurable component, wherein an extruded single- or multilayer molded part with at least one laser-structurable layer that forms an exposed surface of the molded part is applied onto the surface of a non-laser-structurable support element. Alternatively, the at least one laser-structurable layer may be back-molded with a non-laser-structurable thermoplastic support element so that at least one laser-structurable layer of the molded part forms at least one part of the surface of the laser-structurable component. The extruded single- or multilayer molded part is deep-drawn into the component. In the process, the laser-structurable layer of the molded part consists of a thermoplastic molding compound consisting of: (A) 30-99.9 wt. % of a thermoplastic consisting of polyamide; (B) 0.1-10 wt. % of an LDS additive; and (C) 0-60 wt. % of an additive material which is different from (A) and (B).