Contamination Control Sheet Manufacturing via Nip Roller Cooling
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Solution Overview
Problem
Existing contamination control methods for controlled environments, such as cleanrooms, are inadequate in preventing particulate contamination entry, particularly at entry and exit points, leading to reduced product yields and increased costs due to the inability to effectively retain and remove contaminants from flooring surfaces.
Innovation Solution
A method for manufacturing a contamination control sheet involving a web of support material coated with a polymeric material, where the coated surface is pressed onto a cooling roller with a surface roughness of 0.2 to 1 Ra to achieve a smooth, matte finish, enhancing the sheet's ability to attract and retain contaminants while being durable and aesthetically pleasing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coating is applied and cooled on a conventional cooling roller, then the coating cures and cools, but the surface becomes rough and creates retention pockets for contamination
Solution Approach 1:
The invention changes the surface roughness parameter of the cooling roller from conventional rough surfaces to a specifically controlled smooth surface with Ra 0.2-1.0 micrometers. This parameter change allows the warm polymeric coating to conform to the smooth roller surface, creating a smooth finished surface that minimizes contamination retention pockets while maintaining proper curing and cooling functions.
2Object-affected harmful factors
If the cooling roller surface is made smooth to reduce retention pockets, then contamination control improves, but the coating may not adhere properly or maintain durability
Solution Approach 1:
The invention optimizes the surface roughness parameter to a specific range (Ra 0.2-1.0 micrometers) that balances smoothness for contamination control with sufficient mechanical interlocking for coating adhesion. The polymeric coating material is also formulated with appropriate viscosity and curing characteristics to ensure proper bonding to the smooth roller surface while maintaining durability and contamination control performance.
3Manufacturing precision
If the coating is pressed onto the cooling roller while warm, then surface smoothness is achieved, but the process requires precise temperature and pressure control
Solution Approach 1:
The invention performs the pressing action immediately after the coating is applied while the material is still warm and pliable, before it sets or cures completely. This preliminary pressing while warm allows the coating to conform to the smooth cooling roller surface, creating the desired smooth finish. The timing is critical - pressing too early before proper adhesion or too late after setting would compromise the surface quality.
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 contamination control sheet with improved surface characteristics that minimizes retention pockets during cleaning, effectively reducing contamination entry and maintaining a controlled environment, while being aesthetically matte and durable.
Implementation Method 1
As the cooling roller reduces the temperature of the coating it completes the curing of the coating
Implementation Method 2
a nip roller is provided adjacent to the cooling roller so that the coated surface of the support material is pressed onto the cooling roller by the nip roller
Data Source
AI summary
The present invention related to a method of manufacturing of a contamination control sheet, the method comprising the steps of: passing a web of support material from a supply roller to a coating station, and applying a coating of polymeric material to one surface of the support material; passing the coated support material through an oven to cure the polymeric material; and passing the coated support material around a cooling roller to a take up roller; characterised in that a nip roller is provided adjacent to the cooling roller so that the coated surface of the support material is pressed onto the cooling roller by the nip roller, and further characterised in that the cooling roller has a surface roughness of 0.2 to 1 Ra.