Multilayer Bag Stabilization Adhesive Design
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Solution Overview
Problem
Existing multi-layer sacks for bulk goods lack sufficient stability and dimensional stability, often bulging due to the flexibility of the sack material and inability to absorb external forces effectively, requiring a stronger and more expensive outer layer.
Innovation Solution
The introduction of stabilization adhesives between adjacent material layers to enhance the sack's shape and breakage stability, allowing forces to be transferred from the outer layer to the inner layers, thereby increasing dimensional stability and tear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a multi-layer sack structure is used, then the sack can be made from flexible material, but the sack loses dimensional stability and bulges when filled
Solution Approach 1:
The sack is divided into multiple material layers (at least two layers) that are bonded together through stabilization bonds. This segmentation allows each layer to contribute to flexibility while the collective bonded structure provides dimensional stability, preventing the bulging that occurs in single-layer flexible sacks.
Solution Approach 2:
Multiple material layers are merged through stabilization bonds to create a composite structure. The bonding combines the flexibility advantage of multiple layers with the stability of a unified structure, resolving the contradiction between flexibility and dimensional stability.
2Strength
If a stronger outer material layer is used to absorb external forces, then the sack's tear resistance improves, but the manufacturing cost increases
Solution Approach 1:
The sack uses a composite multi-layer structure where stabilization bonds connect multiple material layers. This composite construction distributes external forces across all layers rather than concentrating them on a single expensive outer layer, achieving high tear resistance through structural coordination rather than material strength alone, thereby reducing overall material cost.
Solution Approach 2:
Stabilization bonds are applied in advance during manufacturing to pre-connect the material layers. This preliminary bonding ensures that when external forces are applied during use, the layers are already positioned to work together effectively, distributing loads and preventing tear propagation without requiring excessively strong individual layers.
3Ease of manufacture
If material layers are loosely stacked to maintain flexibility, then the sack can be easily manufactured, but the layers shift against each other reducing stability
Solution Approach 1:
Stabilization bonds act as intermediary elements between material layers. These bonds are applied during manufacturing to connect layers at specific points, preventing shifting while maintaining the overall flexibility of the multi-layer structure. The bonds serve as mediators that provide stability without requiring complete rigid bonding of all layers.
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 stabilization bonds improve the sack's ability to maintain a cuboid shape, increase tear resistance, and allow for the use of less expensive materials by distributing external forces across multiple layers, resulting in higher quality and more stable sacks.
Implementation Method 1
between at least one pair of adjacent material layers there are stabilizing adhesives that glue the sides of the two adjacent material layers of the flat material together
Data Source
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AI summary
A bag (10) for bulk goods such as cement, gypsum, granules, animal feed, or the like, made of a two- or multi-layered, planar material, in particular paper and/or plastic, wherein the bag has two opposing bottoms (20, 30) and a side wall (40) extending between the bottoms. A stabilizing adhesive (50) is present between at least one pair of adjacent material layers of the planar material, which bonds the abutting sides of the two adjacent material layers together, wherein the stabilizing adhesive (50) is formed at least in the area of the side wall (40) and/or continuously or sectionally along one or more of the bottom edges (35, 36) formed by the meeting of the bottoms (20, 30) and the side wall (40), on the side of the side wall and/or on the side of the bottom.