Bituminous Noise-Deadening Coating for Plastic Dishwasher Parts
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Solution Overview
Problem
Existing noise-deadening coatings for domestic appliances, such as dishwashers, face challenges with temperature-sensitive components like plastic, as hot adhesives can cause thermal stress, while cold-bonding adhesives lack sufficient adhesive power, making it difficult to apply effective noise-deadening coatings without damaging these components.
Innovation Solution
A reactively cured bituminous mixture is used, which remains in a free-flowing but viscous state during application, allowing for precise shaping and adherence to complex surfaces without requiring external heat, thus enabling effective noise-deadening and sound-insulation of temperature-sensitive components without thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hot adhesives are used to apply bitumen mats, then the noise-deadening coating can be effectively applied, but temperature-sensitive plastic components are thermally stressed or damaged
Solution Approach 1:
The invention changes the temperature parameter of the adhesive from hot (conventional) to cold (reactively curing at room temperature). The reactively curing bituminous mixture cures through chemical reaction rather than thermal melting, enabling effective bonding to plastic components without subjecting them to damaging temperatures, thus resolving the contradiction between bonding strength and thermal stress
2Object-affected harmful factors
If cold-bonding adhesives are used to avoid thermal stress, then plastic components are protected, but the adhesive power is insufficient for adequate adhesion to plastic
Solution Approach 1:
The invention uses a composite bituminous mixture that combines the properties of bitumen (providing adhesion) with reactive curing agents (providing cross-linked bonding strength). This composite material achieves both the low application temperature needed to protect plastic components and the high bonding strength required for effective adhesion, resolving the contradiction between thermal protection and bonding reliability
3Reliability
If prefabricated bitumen mats are used, then noise-deadening coverage is achieved, but they cannot be precisely accommodated to complex three-dimensional component shapes
Solution Approach 1:
The invention extracts the bitumen from its conventional prefabricated mat form and applies it directly as a reactively curing coating. This allows the noise-deadening material to be applied conformally to complex three-dimensional shapes, including corners, edges, and recesses, achieving both effective coverage and precise adaptation to component geometry
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 reactively cured bituminous mixture provides a durable, adhesive noise-deadening coating that effectively reduces noise and vibration, conserves energy by minimizing material usage and thermal load, and is suitable for temperature-sensitive components, enhancing the operational quietness and efficiency of domestic appliances.
Implementation Method 1
the noise-deadening and/or sound-insulating coating's being or including a reactively cured bituminous mixture
Data Source
AI summary
A domestic appliance, in particular a domestic dishwasher, includes at least one component, and at least one noise-deadening and/or sound-insulating coating applied on the component. The noise-deadening and/or sound-insulating coating includes or is made entirely of a reactively cured bituminous mixture. The component can be a wall section for delimiting a rinsing chamber of the dishwasher, or can be a base tray of a rinsing container of the dishwasher.