Hybrid Expandable Composition for Insulating Cellulose Packaging
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Solution Overview
Problem
Biodegradable and compostable packages made from cellulose-based substrates with air gaps suffer from poor insulation and structural integrity due to compression, and existing solutions increase carbon footprint or cost.
Innovation Solution
A hybrid expandable composition comprising an emulsion polymer binder, starch or dextrin, pre-expanded microspheres, and water-soluble salt, forming a closed and open cell structure, which provides improved insulation and structural integrity with reduced carbon footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If air gaps are used as insulation between substrates, then insulation is provided initially, but structural integrity deteriorates when the air gaps are compressed during handling
Solution Approach 1:
The patent applies parameter changes by transforming the physical state of the insulation material from a static air gap to a dynamic expandable composition that can transition between compressed and expanded states. The expandable microspheres change volume in response to environmental conditions, maintaining insulation properties while adapting to mechanical compression during handling.
Solution Approach 2:
The invention introduces dynamics by using an expandable composition that can actively respond to mechanical stress. When compressed during handling, the composition maintains its insulating function through the expandable microsphere structure, and can recover or maintain its insulating properties, making the system adaptive rather than static.
2Strength
If additional or thicker substrates are added to improve structural integrity, then strength is improved, but carbon footprint and cost increase
Solution Approach 1:
The patent employs composite materials by combining expandable microspheres with a binder system to create a hybrid expandable composition. This composite structure provides enhanced structural integrity through the interconnected foam matrix while using minimal material quantity, as the expansion process creates a lightweight yet strong insulating layer.
Solution Approach 2:
The invention utilizes phase transitions of the expandable microspheres, which transition from a compact state to an expanded foam structure. This phase change enables the material to achieve high structural integrity and insulation properties from a small initial volume, avoiding the need for additional substrates or thicker materials.
3Strength
If reinforce the air gap insulations is used to improve structural integrity, then strength is improved, but device complexity and cost increase
Solution Approach 1:
The expandable composition serves multiple functions simultaneously: it provides thermal insulation, structural reinforcement, and cushioning protection. This multi-functionality eliminates the need for separate insulation layers and structural supports, simplifying the overall package structure while maintaining or enhancing structural integrity.
Solution Approach 2:
The invention merges the functions of insulation and structural reinforcement into a single hybrid expandable composition layer. By combining the expandable microspheres with the binder system, the patent creates a unified material that performs both insulating and strengthening functions, reducing the number of components and simplifying package design.
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 hybrid composition achieves enhanced insulation and cushioning properties with thinner substrates, maintaining structural integrity and reducing environmental impact.
Implementation Method 1
a hybrid expandable composition including from about 30 to about 80 wt % of a hybrid binder system mixture; about 1 to about 15 wt % of a plurality of microspheres; about 0.1 to about 5 wt % of a water-soluble salt
Implementation Method 2
a binder system, which is a mixture of (i) an emulsion polymer binder having a Tg range from about −40° C. to about 60° C. and (ii) a starch or dextrin
Implementation Method 3
a plurality of pre-expanded or expandable microspheres; subjecting the hybrid expandable composition to rapid heating
Data Source
AI summary
A hybrid expandable composition that provides improved expansion and loft properties is disclosed. The hybrid expandable composition is particularly useful in providing insulation and/or cushion to substrates.