Biodegradable three-dimensional network structure
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Solution Overview
Problem
Current biodegradable three-dimensional network structures lack both excellent compression durability and high compression recovery after heat compression, which are essential properties for applications such as cushioning materials.
Innovation Solution
A biodegradable three-dimensional network structure incorporating polybutylene adipate terephthalate resin with a weight average molecular weight of 35000 or more, featuring a linear fiber with a crystalline melting enthalpy of 16 J/g or more, an apparent density of 0.005 g/cm3 to 0.30 g/cm3, and a thickness of 10 mm to 100 mm, along with a fiber diameter of 0.2 mm to 2.0 mm, and a hollow cross-sectional shape, enabling improved compression durability and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biodegradable network structures are made with conventional resins and processing methods, then manufacturing is easier and cost is lower, but compression durability and compression recovery are insufficient
Solution Approach 1:
The patent applies parameter changes by specifying precise ranges for weight average molecular weight (35,000 or more), crystalline melting enthalpy (16 J/g or more), apparent density (0.005 to 0.30 g/cm³), and fiber diameter (0.2 to 2.0 mm). These parameter optimizations enable the network structure to achieve excellent compression durability and compression recovery while maintaining manufacturability through controlled processing conditions.
2Reliability
If biodegradable network structures are made with higher density materials, then strength and durability improve, but flexibility and comfort decrease
Solution Approach 1:
The patent optimizes the apparent density parameter to a specific range of 0.005 to 0.30 g/cm³, which balances compression durability with flexibility. This parameter control allows the material to maintain structural integrity while providing the needed softness and flexibility for comfort applications.
Solution Approach 2:
The patent creates local quality variations through the three-dimensional network structure with interconnected fibers, where different regions provide different functions. The fiber arrangement and bonding create zones of varying density and flexibility, allowing the material to exhibit both durability and comfort properties simultaneously.
3Strength
If heat compression is applied to improve bonding, then structural integrity improves, but compression recovery capability deteriorates
Solution Approach 1:
The patent controls the crystalline melting enthalpy parameter (16 J/g or more) and weight average molecular weight (35,000 or more) to enable the resin to achieve adequate bonding strength through heat compression while retaining sufficient molecular chain mobility for compression recovery. This parameter optimization allows the material to balance bonding and recovery 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 structure achieves excellent compression durability and high compression recovery after heat compression, making it suitable for applications like cushions, while maintaining flexibility and reducing noise during compression and recovery.
Implementation Method 1
the linear fiber has a crystalline melting enthalpy of 16 J/g or more
Data Source
AI summary
An object of the present invention is to provide a biodegradable three-dimensional network structure having excellent compression durability and high compression recovery after heat compression. The biodegradable three-dimensional network structure includes a linear fiber including a polybutylene adipate terephthalate resin having a weight average molecular weight of 35000 or more, wherein the biodegradable three-dimensional network structure has an apparent density of from 0.005 g/cm3 to 0.30 g/cm3 and a thickness of from 10 mm to 100 mm, and the linear fiber has a fiber diameter of from 0.2 mm to 2.0 mm and a crystalline melting enthalpy of 16 J/g or more.