Backpack Frame Adhesive Bonding for Deformation Control
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Solution Overview
Problem
Conventional backpacks face issues with deformation due to load weight and lack of waterproofing, and existing stiffening frames are not integral, leading to undesirable movements and the need for complex welding techniques that are environmentally undesirable.
Innovation Solution
A backpack design featuring a flexible pack portion with a rigid or semi-rigid sheet frame affixed by adhesive bonding, providing structural support and waterproofing through a polyurethane coating, and using adhesive bonding for the carrying system attachments to prevent deformation and enhance load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a stiffening frame is provided in conventional backpacks, then deformation is reduced, but the frame is not integral and causes undesirable movements and deformations between the frame and the flexible material
Solution Approach 1:
The frame is merged with the pack portion through adhesive bonding, creating an integral connection that eliminates the undesirable movements and deformations between separate frame and fabric components. The frame is no longer a separate insert but is bonded directly to the flexible material, ensuring stable relative positioning.
Solution Approach 2:
The mechanical insertion method (where the frame is placed in a gusset pocket) is replaced with adhesive bonding. This substitution eliminates the need for complex mechanical fastening systems and ensures a more reliable, integral connection between the frame and the pack portion.
2Object-affected harmful factors
If welding is used to assemble waterproof bags, then waterproofing is achieved, but the process is complicated and environmentally undesirable
Solution Approach 1:
The welding process is replaced with adhesive bonding for assembling the waterproof bag. This substitution eliminates the need for complex welding tools and processes while maintaining the waterproofing function. The adhesive bonding method is simpler, more environmentally friendly, and equally effective for joining panels.
Solution Approach 2:
The bonding method is changed from thermal (welding) to chemical (adhesive bonding). This parameter change in the joining process eliminates the need for high temperatures and complex welding equipment, while still achieving the required waterproof seal between panels.
3Object-affected harmful factors
If PVC-coated materials are used for waterproof bags, then waterproofing is achieved, but environmental harm is increased
Solution Approach 1:
The coating material is changed from PVC to polyurethane. This material substitution maintains the waterproofing function while eliminating the environmental harms associated with PVC. The polyurethane coating provides equivalent water resistance without the harmful chemical properties of PVC.
Solution Approach 2:
The use of polyurethane coating creates a composite material structure that combines the flexibility of the base fabric with the waterproof properties of the polyurethane layer. This composite approach achieves waterproofing through a more environmentally friendly material than traditional PVC coatings.
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 design minimizes unwanted deformation, provides effective load transfer, and achieves waterproofing without the environmental drawbacks of PVC-coated materials, while simplifying the assembly process by reducing the need for complex welding.
Implementation Method 1
the frame comprising at least a rigid or semi-rigid sheet frame which is affixed to the back side of the pack portion by adhesive bonding
Implementation Method 2
providing structural support and waterproofing through a polyurethane coating
Data Source
AI summary
A bag or pack, such as a backpack, having a pack portion that includes a back side made of flexible material, a carrying system directly or indirectly connected to the pack portion and including at least one carrying element, a frame connected to the pack portion, the frame including at least a rigid or semi-rigid sheet frame which is affixed to the back side of the pack portion by adhesive bonding.