Regenerated Wiper Blade Rubber for Stable Vibration-Free Cutting
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Solution Overview
Problem
Existing methods for regenerating blade rubber in wiper blades result in uneven cutting surfaces due to vibration shapes, leading to reduced wiping performance.
Innovation Solution
Regenerate blade rubber by setting the storage elastic modulus at 1×103 Hz to 90.0 to 500.0 MPa and breaking stress to 4.2 to 30.0 MPa, using polyurethane with finely dispersed hard and soft segments, and controlling molecular mobility to prevent deformation and breakage during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a cutting blade is used to regenerate blade rubber tip-end, then the worn contact portion is removed, but vibration shapes are generated on the cut surface causing uneven wiping performance
Solution Approach 1:
The patent changes the physical parameters of the blade rubber by controlling the storage elastic modulus (E') to be 90.0 to 500.0 MPa at a vibration frequency of 1×10³ Hz and breaking stress to be 4.2 to 30.0 MPa. These parameter adjustments ensure the rubber has appropriate stiffness and strength to prevent vibration during cutting while maintaining wiping performance.
Solution Approach 2:
The patent addresses vibration-induced cutting surface defects by controlling the molecular mobility and segmental structure of the polyurethane rubber. The finely dispersed hard and soft segments create a material structure that resists vibration at cutting frequencies, eliminating the vibration shapes that cause uneven wiping surfaces.
2Ease of operation
If blade rubber is made flexible for good wiping performance, then contact with windshield is improved, but cutting stability deteriorates due to deformation and breakage
Solution Approach 1:
The patent uses polyurethane rubber with finely dispersed hard and soft segments, creating a composite material structure at the molecular level. The hard segments provide cutting stability and structural integrity, while the soft segments maintain flexibility for good wiping contact with the windshield surface.
Solution Approach 2:
The patent creates different local properties within the blade rubber material by having finely dispersed hard segments embedded in a soft segment matrix. The hard segments are distributed throughout to provide localized stiffness for cutting stability, while the continuous soft phase ensures overall flexibility for wiping performance.
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
Achieves a regenerated blade rubber with uniform contact and wiping performance comparable to new blades, promoting resource efficiency by preventing surface disturbances and ensuring stable cutting progress.
Implementation Method 1
entering a cutting blade into the blade rubber from a side portion of the blade rubber at one end portion A of the blade rubber, and moving the cutting blade relative to the blade rubber toward another end portion B of the blade rubber to remove at least a part of the contact portion
Implementation Method 2
controlling molecular mobility to prevent deformation and breakage during cutting
Implementation Method 3
using polyurethane with finely dispersed hard and soft segments
Data Source
AI summary
There is provided a regeneration method of blade rubber used for a wiper blade. At least a part of the blade rubber constitutes a contact portion with a wiping target object. The regeneration method includes a step of preparing the blade rubber to be regenerated, and a cutting step of entering a cutting blade into the blade rubber from a side portion of the blade rubber at one end portion A of the blade rubber, and moving the cutting blade relative to the blade rubber toward another end portion B of the blade rubber to remove at least a part of the contact portion, and a storage elastic modulus of the blade rubber at a vibration frequency of 1×103 Hz is 90.0 to 500.0 MPa, and a breaking stress of the blade rubber is 4.2 to 30.0 MPa.