Anti-incendiary flexible intermediate bulk container with induction control
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Solution Overview
Problem
Flexible intermediate bulk containers (FIBCs) made of woven polypropylene fabrics experience electrostatic charge buildup due to triboelectrification, leading to potential incendiary discharges, especially when ungrounded, and can induce hazardous voltages on nearby ungrounded conductors.
Innovation Solution
The use of quasi-conductive fibers in the woven fabric and an antistatic additive in the coating, combined with conductive or quasi-conductive sewing yarns, enhances electrical continuity and allows controlled charge dissipation through corona discharge, reducing residual charges and induced voltages, even when the container is ungrounded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional non-conductive polypropylene fabric is used for FIBC construction, then the container is electrically isolated and simple to manufacture, but electrostatic charge accumulates leading to incendiary discharge risks
Solution Approach 1:
The patent modifies the electrical properties of the polypropylene fabric by incorporating conductive fillers (carbon black, metal particles, or conductive fibers) to change the volume resistivity from insulating levels (>10^12 ohm-cm) to controlled conductive levels (10^4 to 10^8 ohm-cm), enabling charge dissipation while maintaining fire safety
Solution Approach 2:
The patent creates a composite material system combining polypropylene base fabric with conductive additives (carbon black, metal particles, or conductive fibers like stainless steel or nickel) to achieve both mechanical strength and controlled electrical conductivity for preventing incendiary discharges
2Object-generated harmful factors
If conductive fibers are added to the fabric to create a grounded container, then electrostatic charge is dissipated, but the container becomes dependent on continuous grounding and more complex to fabricate
Solution Approach 1:
The patent makes the FIBC self-grounding by incorporating conductive elements directly into the fabric structure, allowing the container to automatically dissipate electrostatic charges through its own walls without requiring external grounding connections or additional grounding systems
Solution Approach 2:
The patent changes the volume resistivity parameter of the fabric itself to conductive levels through filler incorporation, transforming the FIBC from requiring external grounding to being inherently charge-dissipating through its wall material properties
3Object-generated harmful factors
If the fabric is made more conductive to reduce charge accumulation, then incendiary discharge risk decreases, but the container may induce hazardous voltages on nearby ungrounded conductors
Solution Approach 1:
The patent optimizes the volume resistivity to a specific range (10^4 to 10^8 ohm-cm) that balances two opposing requirements: sufficiently conductive to dissipate charge and prevent incendiary discharges, yet sufficiently resistive to limit current flow and minimize induction to nearby ungrounded conductors
4Strength
If polypropylene fabric is hot-drawn to orient yarns for strength, then mechanical strength and stability are enhanced, but the fabric becomes more prone to triboelectrification during handling
Solution Approach 1:
The patent incorporates conductive fillers (carbon black, metal particles, or conductive fibers) into the hot-drawn polypropylene fabric structure to create a composite material that maintains the mechanical strength from yarn orientation while adding charge-dissipating properties to reduce triboelectrification during handling and loading operations
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 reduces the risk of incendiary discharges from the container and minimizes hazardous voltages on nearby objects, ensuring safe handling and storage in flammable environments without the need for continuous grounding.
Implementation Method 1
enhances electrical continuity and allows controlled charge dissipation through corona discharge
Implementation Method 2
the shifting of specific materials within containers made of woven fabrics, as well as particle separation between the materials and such containers during loading and unloading of the container cause triboelectrification and create an accumulation of static electricity on the container walls
Data Source
AI summary
A method, apparatus and system is provided for both (1) decreasing electrostatic discharges to reduce the potential for incendiary discharges caused by electrostatic charges in flexible containers such as flexible intermediate bulk containers (FIBCs) and (2) decreasing the induction on isolated conductors nearby the container to reduce the potential for incendiary discharges from the isolated conductors.