Extensible Slit Paper for Low-Force Hexagonal Cell Expansion
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Solution Overview
Problem
Existing expanded slit sheet paper is non-extensible and requires high pulling forces for expansion, necessitating complex machinery and limiting its use to heavier, less recyclable materials, while also being prone to tearing during expansion.
Innovation Solution
The use of extensible paper with controlled extensibility in the machine and cross directions, allowing for reduced pulling forces and easier expansion, forming interlocking hexagonal cells, and facilitating use in lighter weight papers for cushioning and void fill applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If non-extensible Kraft paper is used for expanded slit sheet, then the paper has high strength and resistance to tearing, but the pulling force required for expansion is very high and complex machinery is needed
Solution Approach 1:
The patent changes the physical parameter of the paper by introducing extensibility through specific fiber composition and bonding characteristics. The extensible paper can stretch 15-50% before breaking, allowing manual expansion devices to apply sufficient force without requiring complex machinery. This parameter change enables the transition from high-force mechanical expansion to low-force manual or automated expansion.
Solution Approach 2:
The patent replaces complex mechanical expansion systems with simpler devices by changing the material properties of the paper. Instead of relying on high-force mechanical systems to expand non-extensible paper, the invention uses the inherent extensibility of the paper to allow expansion with much simpler, lighter, and more cost-effective devices.
2Reliability
If non-extensible paper is used for expanded slit sheet, then the paper maintains structural integrity, but the expansion process causes tearing and requires heavy machinery
Solution Approach 1:
The patent introduces a critical parameter change by giving the paper extensibility of 15-50% break elongation. This allows the paper to undergo significant deformation during expansion without breaking, resolving the contradiction between maintaining structural integrity and reducing expansion force. The paper can stretch to accommodate the expansion process while maintaining reliability.
Solution Approach 2:
The extensible paper acts as a cushioning element that absorbs the expansion forces beforehand. The paper's ability to stretch 15-50% before breaking provides a buffer that prevents sudden failure during expansion, allowing the use of lighter expansion devices that apply force gradually without causing tearing.
3Weight of moving object
If lighter weight paper is used for expanded slit sheet, then the cushioning effect is improved for fragile items, but the paper requires high pulling forces for expansion
Solution Approach 1:
The patent changes the extensibility parameter of lightweight paper from typical low values to 15-50% break elongation. This allows lightweight papers (including tissue paper and newsprint) to be used for expanded slit sheets without requiring high expansion forces. The extensibility parameter enables lightweight paper to achieve both low weight and easy expansion.
Solution Approach 2:
The patent creates a composite structure by combining extensible fiber materials with specific bonding characteristics. This composite approach allows the paper to maintain lightweight properties while gaining the extensibility needed for easy expansion. The composite nature of the paper structure provides both low weight and high stretch capability.
4Force
If extensible paper is used for expanded slit sheet, then the pulling force for expansion is reduced and lighter papers can be used, but the paper must maintain sufficient strength for packaging
Solution Approach 1:
The patent optimizes the extensibility parameter to a specific range of 15-50% break elongation. This parameter change allows the paper to be sufficiently extensible for easy expansion while maintaining adequate strength for packaging applications. Papers with extensibility outside this range either require too much expansion force or lack sufficient packaging strength.
Solution Approach 2:
The patent applies different properties to different aspects of the paper: high extensibility (15-50% stretch) for expansion ease, while maintaining adequate tensile strength and tear resistance for packaging strength. The local quality principle allows the paper to exhibit different mechanical properties as needed for different functions.
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 extensible paper reduces the force required for expansion, enabling smaller, recyclable expansion devices and preventing tearing, expanding the market for lighter weight papers suitable for fragile items and void fill.
Implementation Method 1
an extensible paper that, e.g., advantageously substantially reduces a pulling force necessary to expand the expanded slit sheet material
Data Source
AI summary
An extensible slit sheet paper product is produced having an expandable slit pattern that forms open cells upon expansion of the paper product. The paper product is an extensible paper having an extensibility in the range from 1-9% in the machine direction and 1-5% in the cross direction. The expansion produces an array of hexagonal cells. The expanded extensible paper can be used to wrap an object for shipping by wrapping and cushioning the object in the expanded slit sheet material. The extensible, expandable slit sheet paper can be wrapped around itself to produce a void fill product.