Manufacturing method for cooking vessel
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Solution Overview
Problem
Conventional cooking vessels with concave and convex portions formed by silk screen printing suffer from ink smearing, uneven patterning, and loss of non-stick effect due to solid line patterns, leading to food sticking and uneven oil distribution.
Innovation Solution
A method involving photosensitive paint and a black and white film with dotted line patterns is used to create concave and convex portions on a stainless steel plate, followed by ultraviolet curing and segmentation, resulting in a beehive pattern of protruding dots for enhanced non-stick performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silk screen printing is used to form concave and convex portions, then the non-stick function is provided, but ink smearing occurs and uniform patterning cannot be achieved
Solution Approach 1:
The patent replaces the mechanical silk screen printing process with a photochemical process. A photosensitive resin layer is applied to the cooking vessel bottom surface, then exposed to ultraviolet light through a patterned mask. The exposed areas cure to form convex portions while unexposed areas remain recessed, eliminating ink smearing and achieving precise, uniform patterning without mechanical contact.
Solution Approach 2:
The patent changes the state of the resin material from uncured to cured through ultraviolet light exposure. This parameter change (chemical transformation) allows the resin to harden in specific patterns, creating the concave and convex structure with high precision and uniformity, overcoming the limitations of mechanical printing methods.
2Area of stationary object
If a solid line pattern is used for concave and convex portions, then the surface is covered, but the non-stick effect is lost in the lengthwise direction and food sticks to the surface
Solution Approach 1:
The patent segments the continuous solid line pattern into discrete dotted or dashed line patterns. This segmentation creates gaps between the convex portions, allowing oil to penetrate and distribute evenly across the surface. The segmented pattern maintains sufficient surface coverage for structural integrity while preventing food sticking by eliminating continuous contact areas.
Solution Approach 2:
The patent applies different properties to different parts of the surface pattern. The convex portions provide structural support and localized non-stick properties, while the gaps between them allow oil distribution. This local differentiation of function ensures both surface coverage and effective non-stick performance throughout the cooking vessel bottom.
3Area of stationary object
If a beehive pattern with solid lines is used, then the surface is fully covered, but oil gathers inside the hexagons and does not distribute evenly
Solution Approach 1:
The patent segments the solid line boundaries of the beehive pattern into dotted or dashed lines. This creates discontinuous barriers that prevent oil from being trapped inside the hexagons. The segmented pattern allows oil to flow freely across the entire surface while maintaining the hexagonal structural arrangement, achieving both full surface coverage and uniform oil distribution.
4Area of stationary object
If manual silk screen printing is used for large area printing, then the work space is increased, but constant printing quality cannot be maintained on starting and finishing portions
Solution Approach 1:
The patent replaces manual mechanical printing with an automated photochemical process. A transparent mask with the desired pattern is placed over the photosensitive resin layer, and ultraviolet light is shone through the mask. This method allows large area printing with consistent quality across the entire surface, as the light exposure process is uniform and not subject to manual operation variations at the edges.
5Reliability
If the coating layer is applied on the inner surface only, then the non-stick function is provided, but the film layer is easily peeled off when external impact or temperature is applied
Solution Approach 1:
The patent creates the concave and convex pattern on the cooking vessel bottom surface before applying the non-stick coating layer. The convex portions provide mechanical interlocking features that anchor the coating layer, while the concave portions allow the coating to conform to the surface topology. This preliminary structuring ensures strong bonding even under external impact or temperature stress.
Solution Approach 2:
The patent creates different surface topographies in different areas - convex portions that protrude and concave portions that recess. When the coating is applied, it forms differently in these areas, creating a mechanically interlocked structure that enhances bonding strength locally throughout the entire surface, preventing peeling under stress.
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 achieves precise and uniform concave and convex patterning, maintaining non-stick effectiveness across the cooking vessel surface, preventing food from sticking and ensuring even oil distribution.
Implementation Method 1
irradiating the film with ultraviolet rays to allow the portions of the paint layer disposed underneath the transparent portions to be cured
Data Source
AI summary
The present invention relates to a cooking vessel and a method for manufacturing the same wherein a plurality of concave and convex portions is protrudingly formed to a shape of a dotted line, not to a shape of a solid line, on the bottom surface of the cooking vessel, thus maximizing a non-stick effect to prevent food from sticking to the bottom surface of the cooking vessel.