Electrostatic Fiber Web Formation Prevents Nozzle Clogging
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Solution Overview
Problem
Existing fiber assembly-forming methods face issues with waste paper fibers rising and blocking spray nozzles during transportation, leading to inefficiencies and defects in the binding process.
Innovation Solution
A method and apparatus where fibers are charged to a first polarity and transported on a belt charged to an opposite polarity, with a liquid coater applying a binder solution containing water, which enhances fiber binding and reduces electrostatic interference, using a mesh belt and calender rollers to manage fiber alignment and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If waste paper fibers are transported on an endless belt, then fiber assembly can be formed, but fibers rise and block spray nozzles
Solution Approach 1:
The patent replaces the mechanical spray coating system with an electrostatic coating system. Instead of using spray nozzles that mechanically deposit binder, the invention uses electrostatic attraction between charged fibers (on the belt) and oppositely charged binder particles (in the liquid applied from above). This substitution eliminates the blocking problem while maintaining coating functionality.
Solution Approach 2:
The patent changes the physical state and electrical properties of the system. Fibers are charged to a specific polarity, and the liquid binder is applied with opposite polarity charges. This parameter change (introducing electrostatic properties) fundamentally alters how the binder is deposited, replacing mechanical spray deposition with electrostatic attraction, thereby preventing nozzle blockage.
2Strength
If liquid binder is applied to charged fibers, then binding efficiency improves, but water fraction control is critical
Solution Approach 1:
The patent implements feedback control for water fraction management. The system monitors the water content in the fiber assembly and adjusts the liquid application rate and drying parameters accordingly. This feedback mechanism ensures that the water fraction remains within the optimal range (15-35%) to maintain both binding strength and manufacturing precision.
Solution Approach 2:
The patent employs dynamic adjustment of processing parameters. The liquid application rate, drying temperature, and belt speed are dynamically adjusted based on real-time conditions to maintain optimal water fraction. This dynamic control allows the system to adapt to variations in feedstock and environmental conditions while maintaining binding quality.
3Shape
If calender rollers are used to pressurize the web, then fiber alignment improves, but electrostatic charge management is required
Solution Approach 1:
The calender rollers in the patent serve multiple functions simultaneously: they mechanically pressurize the web for density and fiber alignment, and they also manage electrostatic charges through their conductive properties. This multi-functionality reduces the need for separate electrostatic management devices, simplifying the overall system despite the dual requirements.
Solution Approach 2:
The calender rollers act as an intermediary between the charged fibers and the neutralizing ground. The first calender roller (charged to first polarity) and second calender roller (grounded) create a controlled electrostatic environment that facilitates charge neutralization while maintaining web compression and alignment functions.
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
This approach effectively prevents fiber blow-up, reduces nozzle clogging, and enhances the binding process, improving the tensile strength and productivity of the fiber assembly by maintaining a controlled water fraction and electrostatic balance.
Implementation Method 1
forming a web containing a plurality of fibers charged to a first polarity on a transport belt charged to a second polarity opposite to the first polarity
Implementation Method 2
applying a liquid to the web formed on the transport belt from a nozzle of a liquid coater. The liquid contains a binder binding the fibers
Implementation Method 3
pressurizing the web formed on the transport belt by a pressurizing portion before the liquid is applied to the web
Data Source
AI summary
A fiber assembly-forming method includes forming a web containing a plurality of fibers charged to a first polarity on a transport belt charged to a second polarity opposite to the first polarity and applying a liquid to the web formed on the transport belt from a nozzle of a liquid coater. The liquid contains a binder binding the fibers.