Conductive Outer Shell for Purity-First Plastic Container
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Solution Overview
Problem
Existing plastic transport and storage containers for highly pure filling materials face challenges in preventing electrostatic charging and impurity release due to the use of conductive fillers and complex multi-layer blow molding processes, which compromise safety and manufacturing efficiency.
Innovation Solution
A single-layer inner container made of high-purity stabilizer-free polyethylene, surrounded by an electrically conductive flexible material with a conductive flap and an outer container with an electrically conductive layer, ensuring electrostatic shielding and impurity-free operation through a simple manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive filler is admixed to the plastic material of the inner container to prevent electrostatic charging, then electrostatic safety is improved, but the purity of the filling material is compromised due to impurity release from the container walls
Solution Approach 1:
The container system is divided into two separate functional components: the inner container made of high-purity plastic material for holding the filling material, and the outer container made of electrically conductive plastic material for electrostatic shielding. This segmentation allows each component to optimize its specific function without compromising the other.
Solution Approach 2:
The outer container acts as an intermediary layer between the inner container and the external environment. It provides electrostatic shielding while allowing the inner container to maintain its high-purity structure, thus mediating between the conflicting requirements of electrostatic safety and material purity.
2Reliability
If multi-layer walls are used for the inner container to provide electrostatic shielding, then electrostatic safety is improved, but the manufacturing complexity increases due to co-extrusion blow molding processes
Solution Approach 1:
The electrostatic shielding function is segmented from the inner container structure and transferred to a separate outer container. This allows the inner container to be manufactured as a simple single-layer structure using conventional blow molding, while the outer container provides the necessary electrostatic protection through its conductive material composition.
3Manufacturing precision
If the inner container is made of high-purity plastic material to prevent impurity release, then the purity of the filling material is improved, but electrostatic shielding capability is reduced
Solution Approach 1:
The container system is segmented into an inner container for purity and an outer container for electrostatic shielding. The inner container can be made of high-purity stabilizer-free polyethylene without conductive fillers, while the outer container made of electrically conductive plastic material provides the necessary electrostatic protection.
Solution Approach 2:
The outer container uses composite plastic material that combines electrically conductive fillers with the plastic matrix, creating a material that simultaneously provides structural integrity and electrostatic shielding capability, distinct from the high-purity material used in the inner container.
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 prevents electrostatic charging and ensures high safety standards by shielding the inner container, reducing the risk of impurity release and simplifying the manufacturing process, while maintaining economic viability.
Implementation Method 1
the outer circumferential surface of the inner container, which is closed at the top, is surrounded by an electrically conductive flexible material, at least one electrically conductive flap which covers at least a part of the upper side of the inner container, the flap being electrically connected to the electrically conductive material on the circumferential surface of the inner container
Implementation Method 2
at least one electrically conductive flap which covers at least a part of the upper side of the inner container, the flap being electrically connected to the electrically conductive material on the circumferential surface of the inner container
Implementation Method 3
The outer container includes at least one layer of electrically conductive plastic material so that also the underside of the inner container that, due to its own weight, rests on the bottom of the outer container is well shielded
Data Source
AI summary
A transport and storage container of plastic for a filling material, having an inner container of polyethylene which is produced in the blow-molding method and which has a single-layer wall structure. The inner container is accommodated by an outer container, which is open at the top and which contains at least one layer of electrically conductive plastic. The outer lateral surface of the inner container is wrapped with an electrically dissipative flexible material, wherein at least one electrically conductive tab covers at least part of the top side of the inner container.