Polylactic Acid Foamed Sheet with Inorganic Filler
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Solution Overview
Problem
Conventional foamed sheets made from polylactic acid lack sufficient cushioning property and sheet strength, particularly when used as a cushioning material, due to issues with compressive stress and puncture resistance.
Innovation Solution
A foamed sheet comprising polylactic acid and a filler, with a compressive stress of 0.2 MPa or less and a puncture strength of 2 N or more when the sheet thickness is 2 mm, achieving fine and uniform foaming that enhances both cushioning property and sheet strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a foamed sheet is made from polylactic acid to be biodegradable, then environmental friendliness is improved, but cushioning property and sheet strength deteriorate
Solution Approach 1:
The patent uses a composite material system consisting of polylactic acid as the base resin and inorganic filler particles (such as calcium carbonate, barium sulfate, or titanium dioxide) dispersed within the foam structure. This composite approach allows the biodegradable polylactic acid to maintain its environmental benefits while the inorganic filler provides reinforcement that improves puncture strength and overall sheet strength, resolving the contradiction between biodegradability and mechanical strength
Solution Approach 2:
The patent employs a controlled foam structure with specific cell size and distribution within the polylactic acid matrix. By optimizing the foaming process to create uniform, fine-cell structures with controlled porosity, the material achieves excellent cushioning properties through energy absorption during compression, while the surrounding polylactic acid and filler provide the necessary structural strength, thus resolving the contradiction between cushioning performance and sheet strength
2Object-affected harmful factors
If a foamed sheet is made from polylactic acid to be biodegradable, then environmental friendliness is improved, but cushioning property deteriorates
Solution Approach 1:
The patent utilizes a carefully engineered foam structure with controlled cell size, distribution, and wall thickness within the polylactic acid matrix. The porous foam structure provides excellent cushioning properties through progressive cell collapse and energy absorption during impact, while the polylactic acid resin and embedded filler maintain structural integrity. This resolves the contradiction between biodegradability and cushioning performance by showing that a properly structured biodegradable foam can achieve both environmental friendliness and reliable cushioning function
3Reliability
If the compressive stress is reduced to improve cushioning property, then cushioning coefficient is improved, but sheet strength deteriorates
Solution Approach 1:
The patent employs a composite structure where inorganic filler particles are dispersed within the polylactic acid foam matrix. The filler particles serve as reinforcement that maintains puncture strength even when the foam structure is optimized for low compressive stress and high cushioning coefficient. The composite architecture allows the foam to deform easily for cushioning while the filler network prevents catastrophic failure, resolving the contradiction between cushioning coefficient and puncture strength
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: filler content (5-50 wt%), filler particle size (0.1-10 μm), foaming agent concentration, and processing temperature. By carefully adjusting these parameters, the material achieves a foam structure with low compressive stress for high cushioning coefficient while the filler reinforcement maintains adequate puncture strength, thus resolving the contradiction between these two mechanical properties
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 foamed sheet exhibits excellent cushioning property and sheet strength, allowing it to be used effectively as a packaging or cushioning material without compromising thickness, while also being biodegradable and environmentally friendly.
Implementation Method 1
the foamed sheet has a compressive stress of 0.2 MPa or less when the cushioning coefficient of the foamed sheet is 10 or less
Data Source
AI summary
A foamed sheet including: a polylactic acid; and a filler, wherein the foamed sheet has a compressive stress of 0.2 Mpa or less when the cushioning coefficient of the foamed sheet is 10 or less; and wherein the foamed sheet has a puncture strength of 2 N or more when the sheet thickness of the foamed sheet is 2 mm.