Nut Waste Composites for Biodegradable Packaging
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Solution Overview
Problem
Plastic products, such as Styrofoam and plastic bags, contribute significantly to environmental pollution due to their non-biodegradability, harming wildlife and ecosystems, while nut wastes, like almond shells and hulls, are often discarded and not utilized, representing a wasted resource.
Innovation Solution
Development of cured nut waste composites by processing nut shells and hulls with binders like polyhydroxybutyrate, polylactic acid, and natural latex, and optionally incorporating fungi or bacteria, to create biodegradable and compostable products such as pots and trays through extrusion, molding, or thermoforming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If plastic products are used, then durability and functionality are improved, but environmental pollution and non-biodegradability worsen
Solution Approach 1:
The patent creates composite materials by combining nut waste (almond shells, hulls) with biodegradable binders such as polyhydroxybutyrate, polylactic acid, and natural latex. This composite approach maintains product durability while ensuring biodegradability, directly resolving the contradiction between strength and environmental harm. The nut waste provides structural integrity while the bio-based binders ensure environmentally friendly decomposition.
Solution Approach 2:
The patent modifies the chemical and physical parameters of nut waste through processing steps including drying, sterilizing, torrefying, and grinding to less than 250 μm particle size. These parameter changes transform the raw nut waste into a material suitable for composite formation, enabling it to achieve both durability and biodegradability simultaneously.
2Loss of substance
If nut waste is discarded, then resource utilization is reduced, but environmental burden is decreased
Solution Approach 1:
The patent converts nut waste, which would otherwise be discarded as harmful environmental pollution, into a beneficial resource for creating durable and biodegradable products. By transforming what was considered waste into a valuable composite material component, the patent simultaneously reduces resource loss and eliminates environmental burden.
Solution Approach 2:
The patent utilizes locally available nut waste resources (particularly almond waste from California's 80% global almond production) to create products that serve environmental needs. The nut waste essentially serves itself by finding productive use rather than being discarded, converting a regional waste problem into a sustainable resource solution.
3Ease of manufacture
If traditional plastics are used, then manufacturing simplicity is maintained, but biodegradability is lost
Solution Approach 1:
The patent employs processing parameters (heating to 110-200°C for less than 5 minutes, extrusion, molding, thermoforming) that are similar to traditional plastic manufacturing, maintaining ease of manufacture. These parameter changes enable the biodegradable composite to be produced using existing manufacturing infrastructure while achieving rapid biodegradability.
Solution Approach 2:
The composite formulation with specific ratios (15-65 wt% nut waste, 15-85 wt% binders, 0.0-20.0 wt% oil) creates a material that processes like traditional plastics but degrades rapidly. The composite structure allows conventional manufacturing techniques to work effectively while the bio-based composition ensures environmental friendliness.
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 resulting nut waste composites are durable, biodegradable, and biocompostable, offering a sustainable alternative to traditional plastics, reducing environmental impact while utilizing otherwise discarded materials.
Implementation Method 1
compounding the nut waste component from step (d), one or more binders selected from a group consisting of polyhydroxybutyrate (PHB), polyhydroxyalkanoate (PHA), polylactic acid (PLA), guayule, natural latex, bentonite, an anionic starch, hyaluronic acid, triethylcitrate, and any combinations thereof; and an oil producing a compounded mixture
Implementation Method 2
drying the nut waste component or adjusting the nut waste component to a pH of 5.0 to 8.0 then drying, sterilizing, or torrefying the nut waste component
Implementation Method 3
drying the nut waste component or adjusting the nut waste component to a pH of 5.0 to 8.0 then drying, sterilizing, or torrefying the nut waste component
Implementation Method 4
heating the compounded mixture to a temperature from about 110° C. to about 200° C. for less than about 5 minutes; (g) extruding, molding, or thermoforming the heated mixture from step (f) into a pot form; and (h) cooling the pot form to form the cured nut waste pot composite
Data Source
AI summary
The present invention provides methods for preparing the nut waste pot composites from a nut waste component, one or more binders, and an oil using a compounder/extruder.