Thermal-Cut Wrapping Material Edges for Smooth Bag Surfaces
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Solution Overview
Problem
Conventional tamper evident bags have uneven surfaces due to indentations from the inner layer's texture showing through the outer layer, and flattened edges reduce usable space, affecting aesthetics and functionality.
Innovation Solution
A wrapping material with a substrate and buffer layer, where edges are tightly merged to form non-flattened lines, and bonding areas are strategically applied to create compartments and accommodating spaces, eliminating indentations and flattened edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermal pressing is used to combine outer layer and inner layer, then the layers are tightly bonded, but the inner layer's texture creates indentations on the outer surface
Solution Approach 1:
The patent divides the bonding process into two distinct stages: first, ultrasonic welding creates localized bonding points between layers without full contact; second, thermal pressing is applied only to edge portions for sealing. This segmentation prevents the inner layer's texture from being transferred to the outer surface while still achieving adequate bonding.
Solution Approach 2:
The patent applies different bonding methods to different regions of the packaging structure. Ultrasonic welding is used for the main body areas where surface flatness is critical, while thermal pressing is reserved for edge portions where sealing is prioritized. This local differentiation resolves the contradiction between bonding strength and surface flatness.
2Shape
If thermal pressing is used to create edges on lateral sides, then edges are formed, but usable internal space is reduced due to flattened edges
Solution Approach 1:
The patent segments the edge treatment to apply thermal pressing only to narrow edge portions rather than the entire lateral side. This allows edges to be formed for structural integrity while minimizing the volume consumed by flattened regions, thereby preserving more usable internal space.
3Stability of the object's composition
If conventional thermal pressing method is used, then layers are bonded and edges are formed, but the process is complex and time-consuming
Solution Approach 1:
The patent replaces conventional full-contact thermal pressing with ultrasonic welding for the main body bonding. Ultrasonic welding uses vibration-based energy to create rapid localized bonding, significantly reducing processing time and improving manufacturing efficiency while maintaining layer bonding stability.
Solution Approach 2:
The patent segments the bonding process into ultrasonic welding for the body and thermal pressing for edges, allowing each method to be optimized for its specific function. This segmentation enables parallel processing and reduces overall manufacturing cycle time.
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 provides a tamper evident bag with smooth, printable surfaces and maximum internal space, suitable for containing items without reducing space due to edge flattening.
Implementation Method 1
an adhesive provided by at least one of the first bonding area of the substrate and the second bonding area of the buffer layer, wherein the first bonding area of the substrate and the second bonding area of the buffer layer are bonded through the adhesive
Data Source
AI summary
A wrapping material includes a substrate and a buffer layer, wherein the substrate has a first lateral edge and a second lateral edge, and the buffer layer has a third lateral edge and a fourth lateral edge. The buffer layer is stacked on the substrate. The first lateral edge of the substrate is tightly merged with the third lateral edge of the buffer layer, and the second lateral edge of the substrate is tightly merged with the fourth lateral edge of the buffer layer. A method of making a wrapping material includes: providing a substrate; stacking a buffer layer on the substrate; using a thermal cutting tool to cut the stacked substrate and buffer layer so that the substrate and the buffer layer are tightly merged at where they are cut as being melted by heat.