Biodegradable Bivalve Spat Collector Using Composite Materials
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Solution Overview
Problem
Conventional plastic collectors used in bivalve spat farming are non-biodegradable, brittle, and contribute to plastic waste in marine environments, posing pollution risks and inefficiencies in spat collection.
Innovation Solution
A bivalve spat collector made from a material comprising at least two biodegradable polyesters and calcium carbonate, with a structure that includes a rough, concave surface and interlocking elements to enhance spat collection efficiency and reduce predation, while being less toxic and biodegradable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional plastic collectors (polypropylene/polyethylene) are used, then spat collection function is provided, but plastic waste pollution and micro-plastic production occur
Solution Approach 1:
The collector uses a composite material comprising polylactic acid (PLA) as the base polymer, calcium carbonate (CaCO3) as filler (30-70 wt%), and silane-treated silica particles as reinforcement. This composite structure provides both biodegradability and mechanical strength, resolving the contradiction between environmental friendliness and durability.
Solution Approach 2:
The patent modifies the material composition parameters by incorporating specific ratios of calcium carbonate (30-70 wt%) and silane-treated silica (1-10 wt%), along with controlling molecular weight and crystallinity parameters of PLA, to achieve optimal balance between biodegradation rate and mechanical performance.
2Strength
If conventional plastic collectors are used, then collector strength is maintained, but brittleness and fragility increase
Solution Approach 1:
The combination of PLA with calcium carbonate and silane-treated silica creates a composite where silica particles act as stress distributors, reducing brittleness while maintaining strength. The silane treatment enhances interfacial bonding between components, preventing premature failure.
Solution Approach 2:
The collector incorporates a porous structure with controlled pore size (10-100 micrometers) and porosity (30-60%), which improves material toughness by providing crack propagation paths that absorb energy, reducing overall brittleness while maintaining structural integrity.
3Object-affected harmful factors
If biodegradable materials are used, then pollution is reduced, but collector durability and reliability decrease
Solution Approach 1:
The patent controls the biodegradation rate by adjusting PLA molecular weight (50,000-200,000 g/mol), calcium carbonate content (30-70 wt%), and crystallinity (30-60%), enabling the collector to maintain structural integrity during the required service period while ensuring complete biodegradation afterward.
Solution Approach 2:
The composite structure with calcium carbonate and silane-treated silica provides structural support that extends collector service life, while the PLA matrix ensures biodegradability. The synergistic combination allows the collector to be durable during use and environmentally friendly after disposal.
4Ease of manufacture
If simple collector structures are used, then manufacturing is easy, but spat collection efficiency decreases
Solution Approach 1:
The collector surface features localized roughness (Ra 0.5-2.0 micrometers) and protrusions (height 0.1-0.5 mm) at specific areas where spat settlement is expected, while other areas maintain smooth surfaces. This localized structural modification enhances spat collection efficiency without significantly complicating the overall manufacturing process.
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 collector significantly increases spat collection efficiency, reduces pollution, and minimizes predation risks, using a biodegradable and less toxic material that degrades in marine environments, thus addressing the challenges of conventional plastic collectors.
Implementation Method 1
The collector being made of a material that comprises at least two biodegradable polyesters, different from one another, and calcium carbonate
Implementation Method 2
said alternative material being able to biodegrade, in particular in the marine environment
Data Source
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AI summary
The present invention relates to a bivalve spat collector that comprises a collecting site configured for collecting said bivalve spat, said collector being made of a material that comprises at least two biodegradable polyesters, different from one another, and calcium carbonate. The collector preferably further comprises at least one interlocking element. The present invention further relates to a collector system comprising at least two collectors that each comprises at least one interlocking element, said collectors being successively connected by the interlocking element(s).