Compostable Spunbonded Tarp with Wet Mechanical Integrity
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Solution Overview
Problem
Conventional compostable containers for yard waste and similar materials are not fully integrated into the composting process, as they are not compostable and can lose mechanical integrity when wet, leading to inefficiencies in transportation and composting facilities.
Innovation Solution
A compostable container formed from a nonwoven, spunbonded web with autogenous and point-bonded meltspun fibers, which is air-transmissive and maintains strength even when wet, allowing it to be used as a tarp for collecting and transporting compostable materials while being fully compostable itself.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compostable containers are used for yard waste, then collection and transportation can be performed, but the containers lose mechanical integrity when wet and are not fully compostable
Solution Approach 1:
The patent uses a composite structure combining natural fibers (cellulose, hemp, flax, jute, sisal, coconut coir, or abaca) with thermoplastic binder fibers. This composite approach allows the container to maintain mechanical integrity when wet while remaining compostable. The natural fibers provide strength and stiffness even in wet conditions, while the thermoplastic binder holds the fiber matrix together, creating a material that resolves the contradiction between maintaining structural strength and being compostable.
2Productivity
If conventional containers are used for transporting compostable materials, then transportation can be performed, but the containers do not break down completely and require separate disposal
Solution Approach 1:
The patent enables complete composting of the container by using naturally decomposable natural fibers as the primary structural component. The thermoplastic binder is used in sufficient quantity to maintain structural integrity during use but is formulated to decompose along with the natural fibers in industrial composting conditions. This allows the entire container to be discarded with the compostable material it carries, eliminating the need for separate disposal and improving composting efficiency.
3Object-generated harmful factors
If natural fibers are used as the continuous phase, then compostability is improved, but mechanical strength may be reduced compared to synthetic materials
Solution Approach 1:
The patent creates a fiber matrix composite where natural fibers form the continuous phase for compostability, while thermoplastic binder fibers are distributed throughout to provide mechanical strength. The thermoplastic binder acts as a matrix that binds the natural fibers together, creating a composite structure that achieves both compostability (from the natural fibers) and adequate mechanical strength (from the thermoplastic binder holding the fiber network together).
Solution Approach 2:
The patent optimizes the ratio of natural fibers to thermoplastic binder, the size and distribution of the binder fibers, and the bonding mechanisms (hydrogen bonding, van der Waals forces, and thermoplastic melting) to achieve the desired balance between compostability and mechanical strength. By controlling these parameters, the container achieves sufficient strength for its intended use while maintaining complete compostability.
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 solution enables efficient collection, transportation, and composting of materials by maintaining structural integrity and allowing rapid water vapor escape, reducing transportation costs and enhancing compostability, with the container breaking down completely within two weeks.
Implementation Method 1
meltspun fibers that are autogenously melt-bonded
Implementation Method 2
autogenously melt-bonded
Implementation Method 3
additionally melt-bonded by point-bonds
Implementation Method 4
air-transmissive
Implementation Method 5
rapid water vapor escape
Data Source
AI summary
A compostable container formed from a compostable, air-transmissive, spunbonded nonwoven fibrous web of meltspun fibers that are autogenously melt-bonded and that are additionally melt-bonded by point-bonds.