Multicomponent Cartridge With Overmolded Diffusion Barrier Film
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Solution Overview
Problem
Conventional multi-component cartridges have limited barrier properties against water vapor diffusion, which can render stored components unusable due to reaction with water, especially in hybrid mortars or PU systems, requiring thick walls or inadequate diffusion control.
Innovation Solution
A multi-component cartridge design featuring a cylinder divided by a diffusion-tight film into separate chambers, where the film is overmolded with thermoplastic material to create a barrier against water vapor diffusion, using materials like aluminum for enhanced protection, and a method involving injection molding to produce such cartridges with a tubular shape and polygonal cross-section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional polyolefin plastics are used for the cartridge cylinder, then the cartridge can be produced inexpensively and processed easily, but the barrier properties against water vapor diffusion are insufficient, requiring thick walls to reduce diffusion to a tolerable level
Solution Approach 1:
The patent applies composite materials by combining a polyolefin plastic cylinder with a diffusion-tight film made of different materials (metal, plastic, or ceramic) that provides superior barrier properties against water vapor diffusion. This composite structure allows the cartridge to maintain ease of manufacture from the plastic cylinder while achieving reliable diffusion protection through the specialized film layer.
Solution Approach 2:
The patent uses a thin diffusion-tight film as a flexible barrier layer that is applied to the interior surface of the cartridge cylinder. This thin film provides effective water vapor diffusion protection without requiring thick walls, thus maintaining ease of manufacture while significantly improving barrier properties.
2Reliability
If the cartridge wall is thickened to reduce water vapor diffusion, then the barrier properties improve, but the device complexity and material consumption increase
Solution Approach 1:
Instead of thickening the polyolefin wall, the patent applies a thin diffusion-tight film made of materials with superior barrier properties (metal, plastic, or ceramic). This composite approach achieves the required reliability against water vapor diffusion without increasing wall thickness or device complexity.
Solution Approach 2:
The patent applies the diffusion-tight film selectively to the interior surface of the cartridge cylinder where water vapor diffusion protection is most critical. This localized application provides effective barrier properties without requiring the entire cartridge structure to be thickened or complexified.
3Reliability
If a diffusion-tight film is applied to the cylinder, then water vapor diffusion is effectively prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses a flexible diffusion-tight film that can be applied to the cylinder surface, providing effective diffusion barrier protection. The film's flexibility allows it to conform to the cylinder shape and be integrated into the existing manufacturing process without requiring completely new complex manufacturing systems.
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
Effectively prevents water vapor diffusion between and into the chambers, maintaining component usability by creating a robust diffusion barrier while allowing for efficient production and use in cartridge presses.
Implementation Method 1
A multi-component cartridge design featuring a cylinder divided by a diffusion-tight film into separate chambers, where the film is overmolded with thermoplastic material to create a barrier against water vapor diffusion
Implementation Method 2
the outer area of the film is overmoulded and firmly bonded to the cylinder
Data Source
Figure 1
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Figure 4~5
AI summary
The inventive multicomponent cartridge (1) for separately storing and for jointly pressing out at least two components of a free-flowing substance comprises at least one cylinder (2) for holding the substance with at least one pressing plunger (4) for pressing out the substance and at least one outlet (5) for the substance. The components of the substance are stored in separate chambers (8, 9) inside the cylinder (2) that extend in the longitudinal direction of the cylinder (2). An inner area (12) of a film (7) forms a partition (13) of the cylinder (2) between the chambers (8, 9) of the multicomponent cartridge (1). An outer area (11) of the film (7) is integrally joined to the cylinder. According to the inventive method for producing the inventive multicomponent cartridge (1), the outer area (11) of the film (7) is encapsulated during the injection molding of the cylinder (2) for the multicomponent cartridge (1).