Laser-Doped Conductivity Sensor Manufacturing
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Solution Overview
Problem
Conventional conductivity sensors for food technology and pharmaceutical applications are complex to manufacture and assemble due to their multi-seal designs, which complicates hygiene and sterilization processes.
Innovation Solution
A method involving a thermoplastic sensor body doped with a laser-activatable metal compound, structured using laser direct structuring to form conductive metal nuclei, and then immersed in a metal plating bath to create conductive traces, eliminating the need for additional seals and simplifying the manufacturing process while ensuring hygiene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional multi-seal electrode arrangements are used to ensure hygienic requirements, then hygiene and sterilization requirements are met, but device complexity and manufacturing effort increase
Solution Approach 1:
The patent combines multiple separate components (electrodes, seals, support bodies) into a single integrated sensor body made of laser-doped plastic. The conductive traces are directly formed within the plastic matrix through laser structuring, eliminating the need for separate seal components and reducing assembly steps while maintaining hygienic requirements.
Solution Approach 2:
The patent changes the material properties of the sensor body by doping plastic with metal compounds that can be activated by laser. This parameter change allows the plastic to transform from a non-conductive material to one that can form conductive traces, enabling integration of electrical functionality directly into the molded part without additional sealing components.
2Reliability
If additional seals and seal support bodies are used to prevent medium penetration, then sealing function is achieved, but manufacturing effort and assembly complexity increase
Solution Approach 1:
The sealing function is merged into the sensor body itself through the laser-doped plastic structure. The conductive traces are formed directly within the plastic matrix, creating an integrated structure that eliminates separate seal components and support bodies, thereby reducing assembly effort while maintaining sealing integrity.
Solution Approach 2:
The patent segments the sensor body into functional zones using laser structuring, creating conductive traces only where needed within the plastic matrix. This selective structuring allows the plastic body to simultaneously serve as structural support, seal, and electrical conductor, eliminating the need for separate sealing components.
3Reliability
If conventional seals are used to meet hygienic requirements, then cleaning and sterilization are possible, but device complexity increases
Solution Approach 1:
The patent merges all sealing and electrical functions into a single integrated sensor body made of laser-doped plastic. By forming conductive traces directly within the plastic matrix through laser structuring, the design eliminates multiple separate components that would otherwise be needed for sealing and electrical connections, resulting in a simpler structure with no difficult-to-clean gaps.
Solution Approach 2:
The patent changes the electrical properties of the plastic material by doping it with metal compounds that can be activated by laser. This allows the plastic to transform from a purely insulating material to one that can form conductive pathways, enabling the sensor body to serve multiple functions simultaneously and reducing the number of components needed.
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 method results in a miniaturized, simpler conductivity sensor with reduced components and assembly steps, enhancing hygienic compatibility and ease of cleaning and sterilization by eliminating difficult-to-clean gaps.
Implementation Method 1
A laser beam writes the paths of the subsequently applied conductive traces on the plastic. Where the laser beam strikes the plastic, the surface of the plastic matrix is decomposed into volatile, cracking, or splitting products, such that the surface is slightly removed. At the same time, metal nuclei are split off from the additive.
Implementation Method 2
Where the laser beam strikes the plastic, the surface of the plastic matrix is decomposed into volatile, cracking, or splitting products
Implementation Method 3
Upon immersion into an electroless copper bath, sharply defined conductive trace layers form on the lasered surface portions.
Data Source
AI summary
The present disclosure relates to a method for manufacturing a conductivity sensor, including a conductive conductivity sensor, including method steps of producing a thermoplastic sensor body of a plastic, which is doped at least partially with a laser activatable, metal compound as an additive, radiating the sensor body at doped locations by means of a laser, so that conductive metal nuclei form from the metal compound, immersing the sensor body in a metal bath, until at least one conductive trace forms on the region having the metal nuclei, where the at least one conductive trace serves as an electrode of the conductivity sensor.