Home Appliance Décor Panel Photo-Masking for Brilliant Metal Patterns
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Solution Overview
Problem
Existing methods for forming patterns on metal sheets for home appliance exterior décor panels, such as etching and rolling, often result in surfaces that are not selectively brilliant, lacking precision and aesthetic appeal, especially when trying to achieve fine patterns.
Innovation Solution
A method involving lamination of a photosensitive dry film with higher etch resistance than the metal sheet, photo-masking to expose specific areas, and electrolytic-polishing to create patterns with a minimum width of 0.1 mm, allowing only the patterned portions to be polished and achieve brilliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If etching or rolling methods are used to form patterns on metal sheets, then patterns can be created on the surface, but the surfaces are not selectively brilliant and lack precision and aesthetic appeal
Solution Approach 1:
The metal sheet surface is divided into patterned regions and non-patterned regions through photo-masking. The photosensitive dry film is laminated on the metal sheet, exposed through a mask, and developed to create precise pattern definitions. This segmentation allows selective electrolytic-polishing only on the exposed pattern areas, achieving high precision without requiring complex masking or post-processing steps.
Solution Approach 2:
The patent replaces mechanical rolling methods with electrolytic-polishing. Instead of using mechanical rollers to emboss patterns, an electrolytic solution is applied to chemically and electrically remove material from exposed areas, creating precise patterns with brilliant surfaces. This substitution eliminates the need for high rolling pressure and achieves better precision and aesthetic quality.
2Shape
If rolling pressure of about 50-60 tons is applied to form patterns on metal sheets, then stereoscopic patterns can be created, but the process requires excessive force and may damage the metal sheet
Solution Approach 1:
The patent replaces the mechanical rolling system with an electrolytic system. Instead of applying 50-60 tons of rolling pressure to create stereoscopic patterns, the process uses electrolytic-polishing where an electrolytic solution removes material from exposed areas through electrochemical reactions. This achieves the desired pattern depth without requiring excessive mechanical force, preventing metal sheet damage while creating brilliant surfaces.
Solution Approach 2:
The patent changes the fundamental parameter from mechanical pressure to electrolytic current density and solution composition. By controlling the electrolytic solution's chemical composition and applying appropriate voltage, the process achieves precise pattern formation with controlled depth. This parameter change eliminates the need for high rolling pressure while maintaining or improving pattern quality.
3Manufacturing precision
If photo-masking is used to create precise patterns, then pattern precision is improved, but the process requires multiple steps including lamination, exposure, and development
Solution Approach 1:
The patent merges the photo-masking process with the electrolytic-polishing process into a single integrated operation. The photosensitive dry film is laminated on the metal sheet, exposed through a mask to define the pattern, and then the same masked sheet is immediately subjected to electrolytic-polishing. This merging eliminates the need for separate masking, pattern transfer, and finishing steps, reducing overall process complexity while maintaining high precision.
Solution Approach 2:
The patent performs preliminary lamination of the photosensitive dry film on the metal sheet before the electrolytic-polishing step. This preliminary action prepares the surface by creating a precise photo-mask that will define the pattern boundaries. By preparing this mask in advance and keeping it attached during electrolytic-polishing, the process ensures precise pattern formation without requiring additional masking steps during the polishing operation.
4Reliability
If the photosensitive dry film has higher etch resistance than the metal sheet, then the film protects non-pattern areas during electrolytic-polishing, but the film must be removed after processing
Solution Approach 1:
The patent applies the discarding principle to the photosensitive dry film. The film is laminated on the metal sheet, used as a temporary mask during electrolytic-polishing to protect non-pattern areas, and then completely removed after processing. The high etch resistance of the film ensures reliable protection during the electrolytic-polishing step, and its complete removal after use eliminates the need for complex post-treatment to retain or modify the mask material.
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
This approach enables the creation of fine, precise, and brilliant patterns on metal sheets, specifically on stainless steel or aluminum, which can be used for home appliances like refrigerator doors, offering a more aesthetically pleasing and durable solution compared to conventional methods.
Implementation Method 1
photo-masking the photosensitive dry film attached to the metal sheet to create a pattern having a minimum width of 0.1 mm in the photosensitive dry film
Implementation Method 2
electrolytic-polishing the photo-masked metal sheet by dipping the photo-masked metal sheet in an electrolytic bath to allow the electrolytic solution to contact the exposed front surface of the metal sheet and form the pattern in the front surface of the metal sheet
Data Source
AI summary
Manufacturing an exterior décor panel for a home appliance includes laminating a photosensitive dry film on a front surface of a metal sheet, the photosensitive dry film having a higher etch resistance than the metal sheet against an electrolytic solution, photo-masking the photosensitive dry film attached to the metal sheet to create a pattern having a minimum width of 0.1 mm in the photosensitive dry film to thereby expose the front surface of the metal sheet corresponding to the pattern in the photosensitive film, electrolytic-polishing the photo-masked metal sheet by dipping the photo-masked metal sheet in an electrolytic bath to allow the electrolytic solution to contact the exposed front surface of the metal sheet and form the pattern in the front surface of the metal sheet, and performing post-treatment on the metal sheet, the post-treatment including washing and removing the photosensitive dry film.