Filled Plastic Operating Element for Metal-Like Tactile Sensation
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Solution Overview
Problem
Plastic operating elements for domestic appliances fail to provide a high-quality metal sensation, either visually or tactilely, due to their low thermal conductivity and inability to mimic the cold feel of metal objects at room temperature.
Innovation Solution
A plastic operating element with a filler material of higher thermal conductivity than the base plastic, such as metal or ceramic particles, is used to enhance the tactile sensation while maintaining cost-effectiveness and mechanical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic is used for the operating element, then cost is reduced and mechanical durability is improved, but thermal conductivity remains low and metal sensation is lost
Solution Approach 1:
The patent applies composite materials by combining plastic with metal fillers (such as aluminum, zinc, or copper particles) to create a filled plastic material. This composite structure maintains the cost and durability advantages of plastic while introducing the high thermal conductivity of metal particles, enabling the operating element to convey a metal-like cool touch sensation without using solid metal construction.
2Illumination intensity
If metal coating is applied to plastic, then visual impression is improved, but tactile sensation remains plastic-like due to thin layer insufficient for heat transfer
Solution Approach 1:
Instead of relying on thin metal coatings, the patent uses metal-filled composite plastic where metal particles are distributed throughout the plastic matrix. This provides both the visual appearance of metal (when combined with appropriate coating or coloring) and the tactile cool sensation, as the metal particles throughout the material enable sufficient heat transfer from the user's finger.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the plastic material by incorporating metal fillers. This fundamental material property change enables the plastic to conduct heat similarly to metal, providing the characteristic cool touch sensation while maintaining the benefits of plastic construction.
3Temperature
If metal weight is integrated in plastic knob, then tactile sensation is improved, but knob weight becomes perceptible only when pulled out and requires sufficiently large diameter
Solution Approach 1:
The patent changes the thermal conductivity parameter through filler incorporation rather than adding significant weight. The metal particles dispersed in the plastic provide the cool touch sensation through enhanced heat transfer, achieving the desired tactile effect without requiring the large diameter or substantial weight associated with integrated metal weights.
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 filled plastic operating element provides a metal-like cool touch sensation and improved thermal conductivity, allowing for safe use in high-temperature appliances without the risks associated with metal coatings, while being cost-effective and adaptable to various applications.
Implementation Method 1
the plastic being admixed with filler, which has a higher thermal conductivity than the plastic
Data Source
AI summary
An operating element for a domestic appliance includes a main body which is made of a material comprised of plastic and a filler admixed to the plastic. The filler has a thermal conductivity which is higher than a thermal conductivity of the plastic. The filler can be present in particle form, e.g. as spheres, grains, fibers or as powder.