Closed-Cell Eco-Resin Sheet for Shock Resistance and Shape Retention
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Solution Overview
Problem
Conventional sheets made of plastic materials are prone to deformation and breakage under external shocks or harsh environmental conditions, lack durability, and have limited shape retention and eco-friendliness.
Innovation Solution
A sheet with a closed cell layer composed of a first resin film layer and a cell layer containing closed cells filled with air, where the ratio of maximum to minimum height of the cells is 1:0.6 to 0.95, and the internal air density is 0.001 to 0.5 g/cm3, using biodegradable polymers like starch, cellulose, and PLA, with a bonded and non-bonded portion structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional plastic sheets are used, then manufacturing is simple and cost-effective, but they are prone to deformation and breakage under external shocks
Solution Approach 1:
The sheet is divided into a flat sheet layer and a bubble sheet layer with multiple closed cells, where each cell acts as an independent shock-absorbing unit. This segmentation allows the structure to dissipate external shocks through controlled deformation of individual cells while maintaining overall structural integrity.
Solution Approach 2:
The sheet combines a flat plastic sheet with a bubble sheet structure to create a composite material that leverages the protective cushioning effect of air-filled closed cells. This composite structure provides enhanced shock resistance and durability compared to conventional single-layer plastic sheets.
2Reliability
If general plastic materials are used, then manufacturing is easy, but environmental impact is negative
Solution Approach 1:
The invention specifies precise parameters for the closed cells including height ratios (Hmax/Hmin between 1:0.6 to 1:0.95) and air density ranges (0.001 to 0.5 g/cm³) to optimize both protective performance and biodegradability. These parameter controls ensure reliable eco-friendly functionality while maintaining manufacturing feasibility.
3Shape
If closed cells with arbitrary height ratios are used, then manufacturing is flexible, but shape retention and elasticity are insufficient
Solution Approach 1:
The invention defines specific parameter ranges for closed cell geometry, particularly the height ratio (Hmax/Hmin) between 1:0.6 to 1:0.95 and air density (0.001 to 0.5 g/cm³). These controlled parameters ensure optimal shape retention and elasticity while remaining achievable through conventional manufacturing processes.
4Loss of information
If conventional sheets are used, then identification is difficult, but adding print portions increases manufacturing steps
Solution Approach 1:
The print portion is integrated directly onto the flat sheet layer of the composite structure, combining identification functionality with the existing sheet design. This merging approach adds minimal manufacturing complexity while significantly improving identifiability and visual appeal.
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 sheet prevents deformation and breakage, maintains shape and elasticity, and enhances identifiability through printing, while being eco-friendly.
Implementation Method 1
the closed cells are filled with a predetermined amount of air, and a ratio of a maximum height (Hmax) and a minimum height (Hmin) of the closed cells filled with air is in a range of 1:0.6 to 0.95
Data Source
AI summary
The present invention relates to a sheet having a closed cell layer and, in particular, to an eco-friendly sheet including a plurality of closed cells formed on an eco-friendly resin film, and a print portion on which a predetermined image is printed. The sheet according to the present invention may be prevented from deforming or breaking even from external shocks or severe external environmental conditions, may improve the shape retention of closed cells, the elastic retention of closed cells, and the shape durability of the sheet, may be distinguished due to printing of a specific image, and may have environment-friendly advantages.