Web Driven Vacuum Transport for Flat Web Handling
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Solution Overview
Problem
Web transport systems in printing applications face challenges with web unevenness and particulate matter issues, leading to poor printing quality due to the need for multiple rollers and arcuate paths, which require angular placement of print heads and result in dust generation.
Innovation Solution
A web handling module using a porous belt and vacuum system to maintain web flatness without sliding contact, allowing for horizontal web transport with print heads positioned vertically, eliminating the need for arcuate paths and reducing dust generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple rollers are added to reduce distance between adjacent rollers to prevent web fluttering, then web flatness is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical roller-based web tensioning system with a vacuum-based system. A vacuum source creates negative pressure within a housing that holds the web, replacing the need for multiple mechanical rollers to maintain web flatness and prevent fluttering.
Solution Approach 2:
The patent uses vacuum (negative air pressure) to hold and flatten the web. The vacuum source creates a pressure differential that presses the web against a flat surface within the housing, achieving web stabilization through pneumatic means rather than mechanical rollers.
2Stability of the object's composition
If rollers are positioned in an arcuate path to maintain web contact, then web flatness is improved, but print head positioning complexity increases
Solution Approach 1:
The patent replaces the arcuate roller positioning system with a flat vacuum housing. The web is held flat against a planar surface by vacuum pressure, eliminating the need for arcuate paths and complex angular positioning of print heads.
3Speed
If sliding contact rollers are used to transport the web, then web transport is achieved, but dust and particulate matter generation increases
Solution Approach 1:
The patent replaces sliding contact mechanical rollers with a vacuum-based holding system combined with a belt transport mechanism. The vacuum holds the web without contact, and the belt transports it, eliminating the sliding friction that generates dust and particulate matter.
Solution Approach 2:
The patent introduces a belt as an intermediary between the vacuum housing and the web transport. The belt is drawn through the vacuum housing, picking up the web and transporting it away, separating the holding function from the transport function to eliminate dust-generating sliding contact.
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 solution ensures superior printing quality by maintaining web flatness and reducing dust-related issues, enabling consistent ink application and efficient modular printing environments.
Implementation Method 1
an air vent coupled to the plenum, the air vent being coupled to an air handler and configured to generate a negative air pressure inside the plenum
Implementation Method 2
the porous belt enabling the negative air pressure to couple the porous belt to a web moving over the support plate
Data Source
AI summary
A web handling module has been developed for horizontally transporting a web under a printer having at least one print head. The web handling module includes a plenum, an air vent coupled to the plenum, the air vent being coupled to an air handler and configured to generate a negative air pressure inside the plenum, a support plate sealingly coupled to the plenum, the support plate having a plurality of apertures configured to allow air to pass through the plurality of apertures, and a porous belt wound about the support plate to form a continuous loop, the porous belt enabling the negative air pressure to couple the porous belt to a web moving over the support plate to rotate the porous belt about the support plate without relative motion occurring between the web and the porous belt.