Oil-Impregnated Web Cleaning for Roller Surface Evenness
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Solution Overview
Problem
In sheet manufacturing using the dry method, attached matter on roller surfaces can transfer to the sheet, leading to uneven surfaces and quality deterioration.
Innovation Solution
A sheet manufacturing apparatus with a cleaning unit using an oil-impregnated web to remove attached matter from roller surfaces, preventing its transfer to the sheet and ensuring evenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dry method is used to manufacture sheets by pressurizing and heating the web, then productivity and resource efficiency are improved, but attached matter accumulates on the roller surface causing sheet quality deterioration
Solution Approach 1:
The cleaning unit performs preliminary cleaning of the roller surface before the web passes through the pressurizing and heating process. By removing attached matter in advance using an oil-impregnated cleaning web, the roller surface is prepared to prevent quality deterioration during sheet manufacturing, thus maintaining both productivity and sheet surface evenness
Solution Approach 2:
An oil-impregnated cleaning web is introduced as an intermediary element between the roller surface and the web being processed. This cleaning web transfers to the roller surface, facilitating the removal of attached matter without directly contacting the web being manufactured, thereby preventing quality issues while maintaining efficient production
2Manufacturing precision
If the roller surface is cleaned continuously to maintain sheet quality, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The cleaning unit operates autonomously within the existing sheet manufacturing apparatus. The cleaning web is automatically fed, pressed against the roller surface, and wound up without requiring external intervention or complex control systems. This self-service mechanism maintains sheet quality while adding minimal complexity to the overall device
Solution Approach 2:
A thin, flexible oil-impregnated web is used as the cleaning medium instead of rigid cleaning mechanisms. This thin film can conform to the roller surface geometry and is easily handled by simple rollers, achieving effective cleaning without requiring complex mechanical structures
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 apparatus effectively removes attached matter from rollers, enhancing sheet quality by preventing its transfer and ensuring uniform heating and pressing, thus improving the evenness and quality of the sheet.
Implementation Method 1
a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit
Implementation Method 2
a pressurizing roller pair that pressurizes the web formed by the web former so as to form a sheet
Implementation Method 3
a heating roller pair that heats the web formed by the web former so as to form a sheet
Data Source
AI summary
A sheet manufacturing apparatus includes: a second web former that forms a web of defibrated substances obtained by defibrating a raw material containing fibers; and a sheet former that forms a sheet of the web formed by the second web former. The sheet former has a former roller unit and a cleaning unit that has an oil impregnated web for cleaning a roller surface of the former roller unit.