Laser-foamed Plastic Mark Compression for Household Appliances
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Solution Overview
Problem
Existing methods for creating laser-generated plastic foam marks on household appliance components often result in excessively foamed areas that are mechanically unstable and prone to protrusions, leading to reduced mechanical stability and increased reject rates during production.
Innovation Solution
A method involving the use of a compression element to increase the density of the plastic foam area, making it more compact and stable, while also applying a cover layer and potentially subjecting it to thermal treatment to enhance hardness and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a laser is used to generate a mark on plastic material by forming plastic foam, then the mark is generated with different color and visual contrast, but the plastic foam area becomes excessively foamed with high protrusion and reduced mechanical stability
Solution Approach 1:
The patent applies parameter changes by controlling laser processing parameters (power, speed, pattern) to optimize foam formation, and subsequently applying compression with defined pressure and temperature parameters to reduce protrusion while maintaining mark visibility. This resolves the contradiction by adjusting physical parameters to achieve both visual contrast and mechanical stability.
Solution Approach 2:
The patent replaces severe mechanical foaming with controlled laser-induced foam formation followed by gentle compression. Instead of relying on excessive foaming to create the mark, the system uses laser energy to create controlled foam structures that are then subtly compressed to achieve the desired profile without compromising mechanical integrity.
2Shape
If extensive foaming is performed to create a raised mark, then the mark has tactile protrusion and visual contrast, but the number and size of gas bubbles increase reducing mechanical stability
Solution Approach 1:
The patent substitutes severe mechanical foaming with controlled laser-induced foam formation. The laser creates foam through localized heating and gas generation rather than mechanical expansion, allowing for more controlled bubble formation. Subsequent compression then consolidates these bubbles to achieve the desired raised shape while maintaining structural integrity.
Solution Approach 2:
The patent changes the physical state and density parameters of the plastic foam through controlled compression. By applying defined pressure and temperature conditions, the foam structure is transformed from a highly porous, unstable state to a denser, more stable state while preserving the raised mark shape.
3Illumination intensity
If the plastic foam area is severely foamed to create the mark, then visual contrast is achieved, but the reject rate increases due to reduced mechanical stability
Solution Approach 1:
The patent optimizes laser processing parameters (power, speed, pulse duration) to create foam structures with optimal density and protrusion. This controlled foam formation, followed by defined compression parameters, produces marks with sufficient visual contrast while maintaining mechanical stability, thereby reducing reject rates and improving production efficiency.
Solution Approach 2:
The patent replaces uncontrolled severe foaming with controlled laser-induced foam formation and subsequent compression. This substitution allows for precise control over foam characteristics, ensuring that marks meet both visual and mechanical requirements, thus reducing rejections and improving productivity.
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 improves the mechanical stability and appearance of the marks by reducing protrusions, enhancing hardness and density, and providing a scratch-resistant surface, thereby reducing production rejects and maintaining a high-quality finish.
Implementation Method 1
the laser beam acts on the plastic material and it fuses it on the top side
Implementation Method 2
it fuses it on the top side by this action of the laser beam
Implementation Method 3
small gas bubbles form, which increase the volume such that plastic foam is virtually generated
Implementation Method 4
The enclosed gas bubbles reflect the light in diffuse manner
Implementation Method 5
the plastic foam area is processed with a compression element and the density thereof is increased by this specific and defined compression
Data Source
Figure 1~5
AI summary
The invention relates to a method for producing a household appliance component (1), in which a base part (2) of the household appliance component (1) is provided, which is formed of plastic at least one a top side (3) and a mark (5) is generated with a laser (4) on the top side (3), wherein a plastic foam area (6) is formed on the top side (3) by means of the laser (4) for the mark (5), wherein the plastic foam area (6) is reduced in thickness (d) and/or increased in density afterwards. The invention also relates to a household appliance component (1).