Porous Silicone Table Tennis Rubber Sheet for Delamination Control
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Solution Overview
Problem
Silicone rubber used in table tennis rubber sheets tends to cause delamination between the solid rubber sheet and the sponge sheet due to weak mechanical strength, affecting the stability of hit ball performance.
Innovation Solution
A table tennis rubber sheet design with a crosslinked silicone rubber sponge sheet featuring specific aperture percentages and proportional areas of apertures and protrusions, ensuring sufficient contact and bonding between the sheets, and using a silicone-based adhesive for attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silicone rubber is used for the sponge sheet, then temperature stability of hit ball performance is improved, but delamination between solid rubber sheet and sponge sheet occurs
Solution Approach 1:
The sponge sheet is designed with controlled porosity featuring apertures with specific area ratios (5-50% of total surface area) and size distributions (0.1-2.0mm diameter). This porous structure reduces the silicone rubber's inherent weakness by creating a gradient density distribution, allowing the material to maintain both temperature stability and adequate bonding strength through optimized pore architecture rather than uniform solid structure
Solution Approach 2:
The patent applies parameter changes by controlling the aperture area ratio between 5-50% and aperture diameter between 0.1-2.0mm. By adjusting these physical parameters of the porous structure, the sponge sheet achieves optimal balance between flexibility (from porous structure) and bonding strength (from reduced material weakness), preventing delamination while maintaining temperature stability
2Object-generated harmful factors
If the sponge sheet is made more flexible to increase spin, then the amount of spin increases, but the recovery speed decreases and ball speed reduces
Solution Approach 1:
The sponge sheet exhibits local quality variations through its porous structure, where different regions have different aperture sizes and densities. This creates zones with varying flexibility - areas with larger apertures provide greater deformation for spin generation, while areas with smaller apertures maintain faster recovery for ball speed, allowing both spin and speed requirements to be satisfied simultaneously
Solution Approach 2:
The rubber sheet assembly functions as a composite material system combining the solid rubber sheet with the porous sponge sheet. The solid rubber provides surface friction for spin, while the porous sponge provides controlled flexibility and recovery. The interaction between these two materials with different properties creates a composite system that achieves both high spin and high ball speed
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 design stabilizes hit ball performance by preventing delamination and maintaining flexibility, ensuring consistent spin and speed regardless of temperature changes.
Implementation Method 1
the rubber sheet is deformed by the contact with the ball, and the force returning to the original shape from this deformation gives spin and speed to the hit ball
Implementation Method 2
the viscoelasticity of the rubber constituting the rubber sheet is important
Implementation Method 3
the solid rubber sheet and the sponge sheet tend to delaminate when the ball is repeatedly hit
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
Provided is a soft rubber backing and a table tennis racket that demonstrates stable striking performance regardless of temperature changes and is capable of suppressing delamination of a solid rubber sheet and a sponge sheet. This table tennis rubber sheet includes a sponge sheet and a solid rubber sheet laminated on one surface of the sponge sheet. The sponge sheet includes cross-linked silicone rubber as as binder. The sponge sheet includes a plurality of openings in a surface Ssp on a side opposing the solid rubber sheet. The solid rubber sheet includes a plurality of protrusions of a specific range on a surface Ssr on a side opposing the surface Ssp. When a specific observation region is set on the surface Ssp of the sponge sheet, the average of the ratio of the openings to a total area is from 20.0 to 50.0%, and the area of the openings and the area of opposing surfaces of the protrusions relative to Ssp satisfy a specific relationship.