Expandable Web Material with Curvilinear Tilde-Slits
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Solution Overview
Problem
Existing expandable web materials require excessive user effort to deploy fully, as they expand primarily in width and not in the longitudinal direction, making them inefficient for packing applications where smaller lattice dimensions and more voids per unit area are needed.
Innovation Solution
The introduction of 'tilde-slits' with a unique curved shape and arrangement allows for bi-directional expansion without the need for a dispenser, enabling the web material to expand fully as it unravels from a roll, with specially designed slits that facilitate easy deployment and create a curvilinear structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional slit patterns are used in expandable web material, then the material expands in width, but it does not expand in the longitudinal direction and requires excessive user effort to deploy fully
Solution Approach 1:
The web material is divided into multiple rows of slits arranged in a specific pattern. Each row contains multiple slits spaced apart, with adjacent rows offset from each other. This segmentation allows the material to expand in both longitudinal and transverse directions when pulled, eliminating the need for excessive user effort while achieving full deployment efficiently.
Solution Approach 2:
The slit arrangement transitions from a single-direction expansion model to a bi-directional expansion model. By arranging slits in multiple offset rows, the material can expand both along the longitudinal axis and the transverse axis simultaneously, creating a two-dimensional expansion pattern that improves both ease of operation and productivity.
2Quantity of substance
If the web material expands only in width, then the lattice structure is simple, but the voids per unit area are reduced and packing efficiency is lowered
Solution Approach 1:
The slit pattern is segmented into multiple rows with slits spaced at specific intervals. Each row contains multiple slits, and adjacent rows are offset from one another. This segmentation creates a complex lattice structure with numerous voids per unit area while maintaining manufacturing simplicity through the repetitive pattern.
Solution Approach 2:
The slit arrangement uses asymmetric spacing and offset between rows to create a non-uniform lattice structure. The slits in adjacent rows are deliberately offset from each other, creating a pattern that maximizes voids per unit area while maintaining structural integrity and ease of deployment.
3Ease of operation
If a dispenser is used to expand the web material, then deployment is controlled, but the device complexity increases and the structure becomes more cumbersome
Solution Approach 1:
The web material is designed to expand automatically as it is pulled from the roll. The slit pattern is configured so that tension applied during normal deployment causes the material to expand in both directions without requiring a separate dispenser mechanism. The material serves its own expansion function through its inherent structural design.
Solution Approach 2:
The dispenser mechanism is completely removed from the system. Instead of using a complex dispenser to control expansion, the invention relies solely on the slit pattern design to enable automatic bi-directional expansion when the material is pulled, simplifying the overall structure while maintaining ease of operation.
Data Source
AI summary
A slit web material has a curvilinear structure that is substantially longer than it is wide, with specially shaped slits, “tilde-slits”, which permit relatively easy expansion upon deployment. The cuts are arranged in continuous rows of tilde-slits. In any given row, the tilde-slits follow one-after-the-other in a curvilinear direction. Adjacent rows of slits are parallel to each other, but are offset from one another such that a line drawn between adjacent tilde-slits in adjacent rows is not perpendicular to the direction of the rows. The invention contemplates that the material dispenses from a continuous roll. If the slits are arranged in the longitudinal direction, then the web material expands in the width direction only upon deployment. However, if the slits are arranged such that the row direction is at some angle to the longitudinal direction, then the web material expands in both directions upon deployment. In this case, a special dispenser is not required, and the material expands in both directions as it is pulled off the roll prior to cutting a desired length of material from the roll.