Composite Foil Packaging for Explosive Molded Bodies
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Solution Overview
Problem
Existing packaging methods for explosive-shaped bodies fail to effectively prevent outgassing of toxic marking materials, leading to diffusion losses and difficulties in storage and portioning.
Innovation Solution
A composite foil pouch with a diffusion barrier layer and a weldable material is used, where the weld seam is positioned close to the shaped body, allowing for vacuum packing and secure sealing to prevent outgassing and facilitate easy portioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the molded body is wrapped tightly in foil or paper and sealed with a self-adhesive label, then the packaging is simple and easy to apply, but toxic marking materials diffuse out through the sealing area leading to loss of substance and reduced reliability
Solution Approach 1:
The packaging uses a composite foil structure with multiple layers including a diffusion barrier layer (metal layer) and a weldable material layer. This composite structure prevents outgassing of marking materials while allowing reliable heat sealing, resolving the contradiction between ease of packaging and prevention of substance loss.
Solution Approach 2:
The patent replaces self-adhesive labeling with heat welding/sealing of the foil packaging. This substitution provides a more reliable seal that prevents diffusion losses of toxic marking materials while maintaining ease of manufacture through efficient heat sealing processes.
2Ease of manufacture
If the opening is sealed by a self-adhesive label, then the packaging process is simple, but the sealing area is particularly susceptible to diffusion losses of toxic marking materials
Solution Approach 1:
The patent replaces self-adhesive sealing with heat welding of the foil material. This substitution creates a more reliable seal that is resistant to diffusion losses of marking materials, while the weldable material layer ensures the sealing process remains straightforward and manufacturable.
Solution Approach 2:
The composite foil structure includes a specific layer designed for heat welding, which provides both reliability in sealing and ease of manufacture. The weldable material layer bonds securely to itself and the diffusion barrier layer, creating a robust seal that prevents marking material diffusion.
3Reliability
If molded parts are placed between two layers of film and sealed at the edges with a large distance from the molded part, then the sealing area is outside the contact area, but the packaged parts are difficult to store and portion
Solution Approach 1:
The patent uses a flexible foil bag that can be vacuum-packed around the molded body. This allows the packaging to conform tightly to the product shape, enabling easy storage and portioning while maintaining effective sealing close to the molded part to prevent outgassing.
Solution Approach 2:
The patent changes the sealing distance parameter to be close to the molded body (less than 2 cm) rather than at a large distance. This allows the use of vacuum packing and tight-fitting foil bags that improve storage and portioning ease while still providing effective protection from outgassing.
4Duration of action of stationary object
If the weld seam is positioned close to the molded body, then the shelf life is improved by preventing outgassing, but the heat input during welding may affect the explosive material
Solution Approach 1:
The composite foil structure with a diffusion barrier layer and weldable material layer allows heat to be concentrated in the sealing area without transferring excessive heat to the molded body. The thin weldable layer provides thermal isolation, enabling close sealing that extends shelf life while protecting the explosive material from harmful heat input.
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 enhances the shelf life of explosive-shaped bodies by preventing outgassing and improving storage and handling safety through effective sealing and portioning.
Implementation Method 1
The composite film includes at least a diffusion barrier layer and a heat-sealable material
Implementation Method 2
a layer of the weldable material... This opening is, however, sealed by a first line weld
Implementation Method 3
The molded part can be advantageously vacuum-packed in a foil bag. This is particularly beneficial because it prevents side reactions with oxygen or similar substances
Data Source
Figure 1
Figure 2~3
AI summary
A packaged explosive-containing molded body (18) comprising i) a molded body with an explosive and an outgassing additive, in particular a marking agent, and ii) a packaging (1) comprising a foil bag (11) made of a composite film (4) comprising at least a diffusion barrier layer (2) and a weldable material (20), wherein the foil bag (11) has an opening (13) through which the molded body can be inserted into the foil bag (11) and wherein this opening (13) is welded by at least a first line weld (15) at a distance of less than 2 cm from an inner surface of the foil bag (11) contacting the molded body.