Silicone Rubber Roller Particle Distribution for Smooth Embossing
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Solution Overview
Problem
Conventional silicone rubber rollers for embossing plastic films often produce surfaces with protrusions that can cause bruising when adhered to thin optical films, as even minute depressions on the roller surface lead to defects in the embossed film, resulting in damage to the adherend.
Innovation Solution
A silicone rubber roller with a surface layer containing spherical solid particles, where particles with diameters of 0.8 μm or less and those with diameters of 30 μm or more each account for 1% or less by volume, preventing the formation of protrusions and ensuring a smooth, bruise-free embossed surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional silicone rubber rollers with solid particles are used for embossing, then release between melted resin and roller surface is improved and finishing speed increases, but protrusions are formed on the embossed surface causing bruising
Solution Approach 1:
The patent changes the particle size parameters of solid particles in the silicone rubber layer, specifically controlling that particles with diameter of 0.8 μm or less and particles with diameter of 30 μm or more each account for 1% or less by volume. This parameter optimization eliminates surface protrusions while maintaining the release properties and finishing speed benefits of silicone rubber embossing rollers.
Solution Approach 2:
The patent uses a composite silicone rubber layer containing specifically sized solid particles embedded within the rubber matrix. This composite structure combines the release properties of silicone rubber with the surface smoothness achieved through controlled particle distribution, resolving the contradiction between productivity and manufacturing precision.
2Reliability
If solid particles are added to silicone rubber to control crepe surface roughness, then release properties are improved, but minute protrusions cause bruising on thin optical films
Solution Approach 1:
The patent optimizes the particle size parameters by controlling the volume percentage of extreme size particles (0.8 μm or less and 30 μm or more to each be 1% or less). This parameter control maintains the release properties needed for reliable embossing while eliminating the minute protrusions that cause bruising on thin optical films.
Solution Approach 2:
The patent applies local quality control by ensuring uniform distribution of specifically sized particles throughout the silicone rubber layer. This creates a consistently smooth surface quality across the entire embossed area, preventing localized protrusions that would cause bruising while maintaining release properties in all regions.
3Shape
If particles with wide size distribution are used in silicone rubber, then crepe pattern formation is achieved, but surface protrusions and defects are created
Solution Approach 1:
The patent changes the particle size distribution parameters by restricting extreme size particles (0.8 μm or less and 30 μm or more to each constitute 1% or less by volume). This optimized parameter range enables crepe pattern formation through particle aggregation while preventing the formation of surface protrusions and defects that would compromise manufacturing precision.
Data Source
AI summary
A silicone embossing rubber roller has no fine depression defects on the surface and, furthermore, is not liable to produce protrusions on an embossed plastic film surface. The silicone rubber roller is such that the silicone rubber layer on the surface contains spherical solid particles, and the spherical solid particles having a particle size of 0.8 μm or smaller and the spherical solid particles having a particle size of 30 μm or larger respectively occupy 1% or less of the volume of all the spherical solid particles.