Non-Continuously Laminated Multi-Layer Bags for Strength
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Solution Overview
Problem
Conventional methods for stretching thermoplastic films to enhance strength often result in weakened films, and existing multi-layer films either require more material or have strength equivalent to the weakest layer, failing to achieve significant strength improvements.
Innovation Solution
The development of multi-layered non-continuously laminated films and bags with strategically placed, relatively weak bonds between layers, which absorb forces before causing layer failure, allowing for increased strength with reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If thermoplastic films are stretched using conventional methods to enhance strength, then the film thickness can be reduced, but the film strength is weakened
Solution Approach 1:
The patent applies composite materials by creating a multi-layered film structure where layers are non-continuously laminated together. This composite structure allows the film to achieve enhanced strength properties through the synergistic interaction of multiple layers, where the collective strength exceeds the sum of individual layer strengths, thereby resolving the contradiction between reducing film thickness and maintaining strength.
Solution Approach 2:
The patent segments the film into multiple discrete layers that are non-continuously laminated together. This segmentation allows each layer to contribute to the overall strength while using less total material, as the layers work together in a coordinated manner to provide enhanced mechanical properties, thus resolving the contradiction between material reduction and strength enhancement.
2Strength
If multi-layer films are created to enhance strength, then strength can be improved, but more material is required
Solution Approach 1:
The patent applies local quality by implementing non-continuous lamination where only specific regions of the film layers are bonded together rather than the entire surface. This localized bonding approach allows the film to achieve enhanced strength properties in critical areas while reducing overall material usage, as unbonded regions use less material but still contribute to the overall structural integrity through their spatial arrangement.
3Quantity of substance
If conventional stretching methods are used to reduce film thickness, then material usage is reduced, but tear resistance and impact resistance deteriorate
Solution Approach 1:
The patent uses composite materials to create a multi-layered structure that provides enhanced tear resistance and impact resistance. The non-continuous lamination creates a composite structure where layers interact to distribute and absorb impact forces, preventing catastrophic failure and improving reliability while using less total material compared to conventional single-layer films.
Solution Approach 2:
The patent segments the film into multiple layers with non-continuous lamination, creating a structured composite that enhances reliability. This segmentation allows the film to absorb and distribute impact and tear forces across multiple layers and bonding interfaces, improving tear resistance and impact resistance while reducing overall material usage.
Data Source
AI summary
Multi-layer bags may be formed to include first and second sidewalls joined along a first side edge, an opposite second side edge, and a closed bottom edge. The first and second layers may be non-continuously laminated together to include bonded regions in which the layers are bonded and unbonded regions in which the layers are not bonded. Such a bag may be described as a “bag-in-a-bag” type configuration in which the inner bag is non-continuously bonded to the outer bag. The inventors have surprisingly found that such configurations of non-continuous bonding provides increased and unexpected strength properties to the multi-layer films and bags.