Abrasive Backing Pinhole Prevention via Dual Polymeric Layers
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Solution Overview
Problem
Super fine abrasive paper products suffer from pinholes in the latex polymer barrier coating, which trap abrasive particles, leading to an uneven surface and poor sanding quality, particularly in super fine grit applications.
Innovation Solution
A method involving a paper with a first and second synthetic polymeric layer, where the second layer is supercalendered to create a smooth surface with Bekk Smoothness greater than 1000, and optionally includes an amorphous rubbery polymer film layer for antislip and curl resistance, with uniformly distributed abrasive particles bonded using an adhesive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a latex polymer barrier coating is applied to provide a smooth surface for adhesive and abrasive particles, then the surface smoothness is improved, but pinholes appear during drying and curing which trap super fine particles and create an uneven surface
Solution Approach 1:
The single latex polymer barrier coating layer is divided into multiple layers: a first synthetic polymeric layer and a second synthetic polymeric layer. This segmentation allows each layer to perform specific functions - the first layer provides structural support while the second layer creates a pinhole-free smooth surface for super fine abrasive particles.
Solution Approach 2:
The first synthetic polymeric layer acts as an intermediary between the paper substrate and the second synthetic polymeric layer. It provides a stable base that prevents pinhole formation in the second layer, thereby mediating between the structural requirements and the surface smoothness requirements.
2Manufacturing precision
If super fine abrasive particles (grit 800 to 1200 and finer) are used, then the sanding quality is improved, but particle trapping in pinholes creates clumps and uneven surfaces
Solution Approach 1:
The coating system is segmented into two layers where the second layer specifically addresses the particle trapping issue by providing a pinhole-free surface, enabling the full benefit of super fine abrasive particles to be realized.
Solution Approach 2:
The invention changes the surface parameter (smoothness) to a critical level (Bekk Smoothness greater than about 1000) that prevents particle trapping, thereby enabling super fine abrasive particles to function at their full potential without creating clumps or uneven surfaces.
3Ease of manufacture
If a single synthetic polymeric layer is applied, then the manufacturing process is simplified, but the surface smoothness is insufficient for super fine abrasive applications
Solution Approach 1:
The manufacturing process is segmented into two coating steps, each optimized for specific requirements. While this increases process complexity slightly, it enables achievement of the critical surface smoothness level needed for super fine abrasive applications.
Solution Approach 2:
The invention uses a composite structure of two different synthetic polymeric layers, where each layer is selected for its specific properties. This composite approach allows the system to achieve surface smoothness levels that would be difficult to obtain with a single material.
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 method results in a smooth, uniform abrasive backing that prevents particle trapping, enhancing the quality and performance of super fine grit abrasive papers by ensuring a consistent surface finish and improved mechanical properties.
Implementation Method 1
supercalendering the abrasive backing after application of the second synthetic polymeric layer to form a smooth surface on the second synthetic polymeric layer
Implementation Method 2
The holes appear due to the release of water vapor during drying
Implementation Method 3
contraction of the dried film during curing
Implementation Method 4
The abrasive particles are bonded to the second synthetic polymeric composition by means of an adhesive
Data Source
AI summary
In one embodiment is provided a method of making an abrasive backing having a smooth surface comprising the steps of providing a paper having a first paper surface and a second paper surface; applying a first synthetic polymeric layer comprising a first synthetic polymeric composition to the first paper surface; and applying a second synthetic polymeric layer comprising a second synthetic polymeric composition to the first synthetic polymeric layer. The method is used to prepare fine abrasive backings having a smooth exterior surface for preparation of fine abrasive papers.