Tilde-Slit Web Material for Bi-Directional Expansion
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Solution Overview
Problem
Existing expandable web materials used for envelope and packing applications require excessive user effort to deploy fully, as they expand primarily in one direction, necessitating multiple pulls to achieve the desired width, and lack optimal voids per unit area.
Innovation Solution
The development of a slit web material with specially shaped 'tilde-slits' arranged in continuous rows, allowing for easy expansion in both directions when pulled from a roll, featuring tilde-slits with angled cuts that facilitate bi-directional expansion without the need for a special dispenser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional slit web material is used that expands in only one direction, then the material structure is simple and easy to manufacture, but multiple pulls are required to achieve desired width and user effort is excessive
Solution Approach 1:
The web material is divided into multiple rows of cells with different orientations. Some rows expand in the first direction while other rows expand in the second direction, allowing bidirectional expansion from a single pull. This segmentation of expansion directions resolves the contradiction by enabling complex deployment behavior through simple structural division.
Solution Approach 2:
The slit patterns in adjacent rows are intentionally made asymmetric relative to each other, with slits in different rows oriented at different angles. This asymmetric arrangement allows the material to expand differently in different directions simultaneously, achieving bidirectional expansion without requiring symmetric pulling actions.
2Quantity of substance
If traditional slit web material with one-directional expansion is used, then the manufacturing process is simple, but the voids per unit area are not optimal for envelope applications
Solution Approach 1:
The web is segmented into multiple rows with different cell orientations and densities. By varying the slit patterns in different rows, the design achieves higher overall void content while maintaining manufacturability through standardized row-based production processes.
Solution Approach 2:
The invention transitions from unidirectional to bidirectional expansion by adding a second dimension of cell orientation. This dimensional change increases the voids per unit area by creating a more three-dimensional expanded structure from the flat web, optimizing packing efficiency for envelope applications.
3Productivity
If special shaped slits are introduced to enable bidirectional expansion, then deployment efficiency improves and multiple pulls are eliminated, but the slit pattern becomes more complex
Solution Approach 1:
The bidirectional expansion capability is built into the web structure during manufacturing, with pre-configured slit patterns in different rows. This preliminary action eliminates the need for multiple pulling operations during deployment, as the structure is pre-prepared to expand in multiple directions simultaneously when pulled once.
Solution Approach 2:
The web material structure serves itself by containing all necessary expansion pathways within the slit patterns. When pulled, the material automatically expands in both directions through the pre-designed cell structures without requiring external guidance or multiple operations, achieving self-directed bidirectional deployment.
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
Enables effortless deployment of the web material with increased voids per unit area, reducing the need for multiple pulls and improving the efficiency of envelope and packing applications by allowing expansion in both width and length directions.
Implementation Method 1
specially shaped slits that permit relatively easy expansion upon deployment
Data Source
AI summary
An envelope construct having at least two layers and at least two sheet layers and a tilde matrix core placed there between. The tilde matrix core formed as a slit web material having a straight or curvilinear structure that is substantially longer than it is wide, with specially shaped slits, “tilde-slits”, which permit relatively easy expansion upon deployment. The expandable web material is especially well suited for construction of a light-weight, padded envelope that is durable and can withstand significant pressure during use.