Web Material Charge Neutralization Roller System
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Web materials in printing machines tend to accumulate high negative charges due to electrostatic charging, posing risks to print shop workers and damaging the materials during handling and processing, especially when using plastic foils and composite materials.
Innovation Solution
A machine with a device comprising a roller and counter-roller, where the roller is grounded and the counter-roller has a semiconductive outer layer, uses a high-voltage source with positive polarity to discharge negative charges from the web material before winding or cutting, thereby reducing the risk of voltage flashovers and material damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrostatic printing aids or corona treatment systems are used to improve ink transfer and print quality, then print quality is improved, but the web material accumulates high electrostatic charges causing safety hazards and material damage
Solution Approach 1:
The invention uses the accumulated negative electrostatic charge on the web material as a beneficial resource by applying a positive electrostatic field that attracts and neutralizes these charges. The harmful electrostatic accumulation is converted into a controlled neutralization process that eliminates safety hazards while preserving the printing quality benefits.
Solution Approach 2:
The invention introduces an intermediary positive electrostatic field between the web material and the environment. This intermediary field acts as a mediator that attracts negative charges from the web material without requiring direct contact, thereby neutralizing harmful charges while maintaining the benefits of electrostatic printing aids.
2Object-affected harmful factors
If high voltage is applied to counter-roller to neutralize charges, then electrostatic charge is reduced, but device complexity increases
Solution Approach 1:
The counter-roller is designed to serve multiple functions: it maintains its primary function of applying pressure during printing while simultaneously serving as a charge neutralization device through the application of positive high voltage. This multi-functionality reduces the need for separate neutralization equipment, thereby limiting the increase in device complexity.
Solution Approach 2:
The invention changes the electrical parameter of the counter-roller by applying a positive high voltage potential to it. This parameter change enables the counter-roller to attract and neutralize negative charges from the web material without requiring structural modifications or additional complex components.
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 effectively neutralizes negative charges on the web material, minimizing the risk to print shop workers and preventing damage from voltage flashovers, even at high web speeds and with critical electrostatic charging materials.
Implementation Method 1
uses a high-voltage source with positive polarity to discharge negative charges from the web material
Implementation Method 2
effectively neutralizes negative charges on the web material, minimizing the risk to print shop workers and preventing damage from voltage flashovers
Data Source
Figure 1
Figure 2a~2b
Figure 3a~3b
AI summary
Machine for processing a web material with a disentanglement roller from which the web material is unwound, a winding roller onto which the web material is wound, or a punch that cuts the web material into web sections, at least one device arranged between the disentanglement roller and the winding roller or punch for processing the web material passing from the disentanglement roller to the winding roller or punch, and an arrangement between the last device for processing the web material in the direction of travel of the web material and the winding roller or punch, consisting of a roller and a counter roller rolling on the circumference of the roller, wherein the roller has at least an outer layer of electrically conductive material that is connected to ground, the counter roller has an outer layer of semiconducting material, and an impingement device for transferring an electrical charge to the outer layer of the counter roller is provided.A high-voltage electrical source with a positive polarity is connected to the device for transferring electrical charge in order to supply a positive charge to the outer layer of the counter roller and to reduce a negative charge of the web material before winding it onto the take-up reel or cutting it into web sections.