Fixing-Nip Exhaust Filtration for UFP Control in Image Forming
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Solution Overview
Problem
Existing image forming apparatuses using the electrophotographic system discharge fine particles such as Volatile Organic Compounds (VOC) and Ultra Fine Particles (UFP) during the fixing process, which are not effectively managed by current exhaust systems.
Innovation Solution
An image forming apparatus with a duct, fan, and filter configuration where the filter is positioned to cover the entire width of the fixing nip portion, allowing for efficient collection of UFPs, and is disposed at the intake inlet to minimize uneven air flow and maintain consistent suction pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is installed in the exhaust duct to collect UFP, then particle collection efficiency is improved, but air flow resistance increases
Solution Approach 1:
The patent employs a filter made of porous material with specific pore size and distribution to capture UFP particles while maintaining adequate air flow. The porous structure allows air molecules to pass through while trapping fine particles, resolving the contradiction between collection efficiency and flow resistance.
Solution Approach 2:
The patent optimizes filter parameters including pore diameter, porosity, and thickness to achieve the desired balance. By carefully selecting and adjusting these parameters, the filter captures UFP effectively while minimizing pressure drop and energy loss.
2Object-affected harmful factors
If the filter width is increased to cover the entire image width, then particle collection coverage is improved, but device complexity increases
Solution Approach 1:
The patent divides the filter into multiple modular sections that can be independently installed and removed. Each section covers a specific width, and multiple sections are arranged side by side to achieve full image width coverage. This modular approach simplifies installation and maintenance while ensuring complete coverage.
Solution Approach 2:
The patent employs a filter with adjustable width or flexible configuration that can adapt to different image widths. The filter may include adjustable support structures or flexible materials that allow it to be configured for various widths, maintaining full coverage without requiring a completely different filter for each width.
3Ease of operation
If the duct forms a closed space for air flow, then air flow control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent integrates the exhaust duct with the existing apparatus housing or structural components, merging multiple functions into a single structure. The duct is designed to utilize existing walls, panels, or frames of the image forming apparatus, reducing the need for separate manufactured components while maintaining effective air flow control.
Solution Approach 2:
The duct structure is designed to serve multiple functions: it provides a closed space for controlled air flow, supports the filter assembly, and integrates with the apparatus housing. This multi-functionality reduces the number of separate components needed and simplifies manufacturing.
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 configuration effectively collects UFPs across the entire region of the fixing nip portion, reducing their discharge outside the apparatus and minimizing image defects caused by offset phenomena.
Implementation Method 1
a fan provided inside the duct, the fan being configured to generate the air flow travelling from the intake inlet to the exhaust outlet
Implementation Method 2
a filter provided detachably attachable to the duct, the filter being configured to collect particles with a predetermined particle diameter that are caused by the release agent
Data Source
AI summary
Disclosed is an image forming apparatus including: a door configured to open a conveying path between a transfer portion for forming a toner image on a recording material and a fixing portion for fixing the toner image, the door facing a surface of the recording material traveling through the conveying path; a duct provided on the door, the duct having an intake inlet and an exhaust outlet; a fan provided inside the duct, which generates the air flow travelling from the intake inlet to the exhaust outlet; and a filter provided detachably attachable to the duct, which collects particles with a predetermined particle diameter, wherein the filter has a width that is equal to or greater than an image width of a recording material with a maximum width passing through a fixing nip portion in a widthwise direction perpendicular to a conveying direction of the recording material.