Cleaning Blade Surface Treatment Layer Hardness Friction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cleaning blades made from polyurethane resin experience increased friction coefficient, delamination, and reduced durability due to low hardness, leading to impaired wear resistance and cleaning performance, particularly when the surface treatment layer is thick or thin.
Innovation Solution
A cleaning blade with a surface treatment layer formed using a combination of bi-functional and tri-functional polyols and isocyanate compounds, achieving high hardness and low friction with a small layer thickness of 10 µm to 100 µm, preventing excessive isocyanate deposition and enhancing cross-linking density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick surface treatment layer is formed using high-concentration isocyanate compound, then hardness is improved, but excessive isocyanate remains on the surface requiring additional removal steps
Solution Approach 1:
The patent changes the chemical composition parameters of the surface treatment layer by incorporating polyisocyanate groups (from isocyanate compound) and polyhydroxyl groups (from polyol) in specific proportions. This chemical parameter adjustment allows the formation of a hardened surface layer with controlled thickness (5-50 μm) that achieves the desired hardness without excessive isocyanate residue, eliminating the need for additional removal steps
Solution Approach 2:
The patent creates a composite surface treatment layer by combining multiple components: polyisocyanate groups, polyhydroxyl groups, and optionally carboxyl groups. This composite structure enables the surface layer to achieve high hardness through cross-linking reactions while maintaining controlled thickness and minimizing excessive isocyanate residue, thus simplifying the overall process
2Device complexity
If the surface treatment layer thickness is reduced, then isocyanate removal steps are eliminated, but wear resistance decreases
Solution Approach 1:
The patent optimizes the thickness parameter of the surface treatment layer to a specific range (5-50 μm) and adjusts the chemical composition parameters (ratio of polyisocyanate to polyhydroxyl groups) to achieve high wear resistance in this thin layer. The cross-linking density is controlled through composition ratios, enabling thin layers to provide sufficient durability without requiring thick coatings or additional removal steps
3Ease of operation
If polyurethane resin cleaning blade is used, then cleaning function is provided, but friction coefficient increases and delamination occurs
Solution Approach 1:
The patent applies local quality modification by forming a surface treatment layer only on the surface portion of the cleaning blade, while the base material remains polyurethane resin. This localized treatment provides low friction and high durability at the contact surface, while maintaining the overall cleaning functionality of the blade. The surface layer composition (polyisocyanate + polyhydroxyl) is specifically designed for friction reduction and delamination prevention
4Ease of operation
If low hardness cleaning blade is used, then cleaning performance is maintained, but edge breaks due to wear and stretching occur
Solution Approach 1:
The patent applies local quality enhancement by forming a hardened surface treatment layer (5-50 μm thick) on the surface of the low-hardness polyurethane blade. This surface layer has high cross-linking density and resistance to wear and stretching, protecting the blade edges during cleaning operations. The base material maintains low hardness for effective cleaning, while the surface layer provides edge strength and durability
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 solution results in a cleaning blade with high hardness, low friction, and excellent wear resistance, ensuring prolonged cleaning performance and eliminating the need for additional isocyanate removal steps.
Implementation Method 1
a bi-functional polyol and a tri-functional polyol are used at a specific ratio and are reacted with a bi-functional isocyanate compound. As a result, the reaction can proceed at higher efficiency, as compared with a similar case where an isocyanate compound is solely used, whereby a cured product having a highly cross-linked structure can be yielded
Implementation Method 2
since the surface treatment layer is as has a thickness as small as 10 μm to 100 μm, remaining of the surface treatment liquid and deposition after drying thereof can be suppressed, whereby coating of the surface with an excessive amount of isocyanate compound can be prevented
Data Source
Figure 1
AI summary
The invention provides a cleaning blade 1, having an elastic body 11 formed of a rubber base material molded product, and a surface treatment layer 12 provided on at least an area of the elastic body 11 to be brought into contact with a cleaning object, characterized in that: the surface treatment layer 12 contains a cured product of an isocyanate group reaction product of a bi-functional isocyanate compound with a bi-functional polyol and a tri-functional polyol; the isocyanate group reaction product has a mole ratio (2-function/3-function) of the bi-functional polyol to the tri-functional polyol of 50/50 to 95/5; the cured product has reacted with a polymer forming the elastic body 11 via isocyanate groups; and the surface treatment layer 12 has a thickness of 10 µm to 100 µm.