Interlocking Expanded Slit Sheet Packaging Layers
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Solution Overview
Problem
Existing paper packaging materials, such as pleated paper and bubble wrap, either lack recyclability or require machinery to expand, and they do not effectively maximize thickness when layered due to nesting issues.
Innovation Solution
A novel paper product comprising multiple slit sheet layers with distinct slit patterns that interlock when expanded, allowing for varying expansion rates and angles to maximize thickness and prevent nesting, eliminating the need for a separator sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple layers of expanded slit sheet material are stacked together, then cushioning capability is improved, but nesting occurs reducing the thickness of the stacked layers
Solution Approach 1:
The patent applies asymmetry by creating non-uniform land area orientations between adjacent layers. Each layer has land areas inclined at specific angles (e.g., 45-60 degrees from vertical), and adjacent layers are oriented with different inclination angles. This asymmetric orientation prevents the layers from nesting into each other, as the inclined surfaces do not align, thereby maintaining the cumulative thickness of stacked layers while improving cushioning capability through multiple layers.
2Length of stationary object
If separator sheets are used between layers to prevent nesting, then thickness is maintained, but device complexity and material usage increase
Solution Approach 1:
The patent extracts and eliminates the separator sheet component from the packaging structure. Instead of using separate separator sheets between layers, the invention achieves the nesting-prevention function through the inherent asymmetric orientation of land areas in the expanded slit sheet material itself. This removal of the separator sheet simplifies the overall packaging material structure, reduces material usage, and lowers complexity while still maintaining thickness through multiple stacked layers.
3Shape
If machinery is used to expand the slit sheet material, then three-dimensional shape is achieved, but ease of operation is reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring the slit sheet material with specific slit patterns, spacing, and orientations during manufacturing. The land areas are pre-inclined at specific angles and the slits are positioned to create the desired three-dimensional hexagonal cell structure upon expansion. This preconfiguration allows the material to self-expand into the correct three-dimensional shape with minimal user intervention, improving ease of operation while achieving the required geometric form.
4Ease of manufacture
If uniform slit patterns are used in all layers, then manufacturing is simplified, but nesting occurs reducing effectiveness
Solution Approach 1:
The patent applies local quality by varying the slit pattern characteristics in different layers. While the basic hexagonal cell structure is maintained for consistency, adjacent layers have different land area inclination angles (e.g., one layer at 45 degrees, adjacent layer at 60 degrees). This local variation in orientation angles prevents nesting between layers while maintaining overall manufacturing feasibility through standardized production processes.
Data Source
AI summary
In accordance with a broad embodiment of the invention, a novel paper product is comprised of two or more slit sheet packing material layers, each layer having its own slit pattern design to create interlocking layers of expansion sheet packaging materials. Each layer expands to create a three dimensional open netting of cells of hexagons, and the like, and is designed to have limited nesting with its opposing layer, thereby maximizing the thickness of the combined layers as compared to nested layers. Adjacent layers have differing slit patterns and can be expanded through expander type machinery such that the expansion rates of the differing slit pattern layers can be varied to deliver the same width of exiting expanded material from each layer. Preferably the differing slit pattern produce when expanded, inclined land areas that have the same number of rows per inch, but different angles of inclination of the land areas, such that adjacent layers can interlock, that is, have a restricted amount of nesting.