Mixed-Oxide Treatment Plate Coating for Scratch-Resistant Gliding
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Solution Overview
Problem
Garment treatment appliances, such as irons and steamers, face challenges in maintaining consistent low friction, scratch resistance, and wear resistance under varying temperature conditions and frequent use, with existing coatings often requiring frequent cleaning to maintain gliding behavior and suffering from static charge buildup during use.
Innovation Solution
A treatment plate with a contact surface coated in a sol-gel layer comprising a mixture of titanium oxide, zirconium oxide, and yttrium oxide, which retains organic lubricants produced during use, providing low friction, corrosion resistance, and durability, and reducing static charge through a triboelectric effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PTFE coating is used for low friction, then gliding behavior is improved, but scratch and wear resistance deteriorates
Solution Approach 1:
The patent applies a composite coating structure consisting of a PTFE-based low friction layer combined with an overcoat layer containing ceramic particles (alumina, silica, or titania). This composite structure integrates the low friction properties of PTFE with the mechanical strength and scratch resistance of ceramic particles, resolving the contradiction between ease of operation and reliability.
2Reliability
If electrochemical aluminum oxide coating is used, then scratch resistance is improved, but substrate applicability deteriorates
Solution Approach 1:
The patent introduces a PTFE-based intermediate layer that can be applied to various substrates (metal, ceramic, plastic) and then combines it with ceramic particles to achieve scratch resistance. This intermediary approach allows the coating system to be adapted to different substrates while maintaining the desired mechanical properties, resolving the substrate applicability limitation.
3Ease of operation
If coating is cleaned frequently to maintain gliding behavior, then friction is reduced, but loss of time increases
Solution Approach 1:
The patent incorporates ceramic particles (alumina, silica, or titania) into the coating structure during manufacturing, creating a scratch-resistant surface that resists contamination and maintains its gliding properties over extended periods. This preliminary reinforcement prevents the rapid degradation that would otherwise require frequent cleaning, reducing time loss.
4Ease of operation
If organic polymer coating is used, then gliding behavior is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent creates a composite coating where an organic PTFE polymer matrix is reinforced with inorganic ceramic particles (alumina, silica, or titania). The polymer provides the low friction gliding behavior while the dispersed ceramic particles provide the mechanical strength and durability, resolving the contradiction between ease of operation and strength.
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 coating maintains excellent gliding behavior, wear resistance, and scratch resistance, with a low coefficient of friction that stabilizes quickly and remains consistent over time, even after cleaning, and reduces static charge buildup, enhancing user experience and appliance performance.
Implementation Method 1
it has been surprisingly found that sol-gel coating layers, in particular those comprising a metal oxide as indicated above, show very good and consistent gliding behavior. Applicant has found that thorough cleaning of the contact plate actually increases friction and that low friction is obtained again by using (i.e. sliding) the plate on the garment being treated. This effect is explained by the fact that organic lubricants, produced by contacting the coating, during use, with the article made of a non-metallic fabric, are retained and accumulated on the network of the produced coating, and will act as a lubricant.
Implementation Method 2
providing low friction, corrosion resistance, and durability, and reducing static charge through a triboelectric effect
Data Source
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AI summary
The invention relates to a treatment plate (10) for a garment treatment appliance (100) for treating garments (30), which plate has a contact surface which is provided with a sol-gel coating (20) that comprises an oxide of titanium, zirconium, hafnium, scandium, yttrium, or a mixture or combination thereof, and wherein the coating comprises a mixed oxide comprising two or more of titanium oxide, zirconium oxide and yttrium oxide. The layer preferably has a thickness of less than 1µm. Such a layer shows excellent properties. A garment treatment appliance comprising such a treatment plate, as well as processes to produce the coating on the contact surface of the treatment plate are also disclosed.