PHA Container Neck Thickness for Faster Biodegradation
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Solution Overview
Problem
Conventional plastic beverage containers, primarily made of PET, contribute significantly to plastic pollution due to their non-biodegradability and slow degradation, and existing biodegradable alternatives like PHA face challenges in manufacturing, especially in forming thin-walled necks that degrade slowly.
Innovation Solution
Designing a plastic container with a neck portion wall thickness of less than 2 mm, preferably 1.2 to 1.6 mm, made of biodegradable PHA, and using a smooth transition with the body portion, combined with a manufacturing method that includes bi-injection and compression blow molding to optimize biodegradability and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the neck portion wall thickness is reduced to accelerate biodegradation, then the degradation time is shortened, but the structural integrity and mechanical strength are compromised
Solution Approach 1:
The patent optimizes the neck portion wall thickness to a specific range (1.2-1.6mm) to achieve the right balance between biodegradation speed and structural integrity. This parameter optimization allows the container to degrade faster while maintaining sufficient strength for normal use and closure retention.
Solution Approach 2:
The patent uses PHA (polyhydroxyalkanoate) as a biodegradable material that combines adequate mechanical properties with biodegradability. This material selection enables the thin-walled neck portion to maintain structural integrity while being capable of biodegradation, resolving the contradiction between thickness reduction and strength maintenance.
2Object-affected harmful factors
If PHA material is used to enhance biodegradability, then environmental friendliness is improved, but manufacturing complexity increases due to difficulty in ISBM processing
Solution Approach 1:
The patent divides the container into two parts: the body portion made of conventional PET material that is easy to manufacture, and the neck portion made of biodegradable PHA material. This segmentation allows the majority of the container to use conventional manufacturing processes while only the neck portion requires special attention to biodegradability, thus reducing overall manufacturing complexity.
Solution Approach 2:
The patent applies different material properties to different parts of the container: the body portion uses conventional PET for ease of manufacture, while the neck portion uses PHA for biodegradability. This local quality approach ensures that biodegradability is enhanced where it matters most (the neck that slows down overall degradation) without compromising the ease of manufacturing the entire container.
3Reliability
If conventional threaded neck design is used to ensure closure retention, then sealing reliability is improved, but degradation time is extended due to increased mass
Solution Approach 1:
The patent reduces the neck portion wall thickness to 1.2-1.6mm, significantly decreasing the mass of the neck portion compared to conventional designs. This parameter change accelerates biodegradation while the patent maintains adequate closure retention through optimized neck geometry and PHA material properties, rather than relying solely on increased thickness.
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 results in significantly faster degradation of the container, particularly the neck portion, while maintaining structural integrity, thus addressing the plastic pollution issue and enhancing the biodegradability of beverage containers.
Implementation Method 1
forming a preform by bi-injection
Implementation Method 2
compression blow molding to optimize biodegradability and mechanical properties
Implementation Method 3
The container body portion wall and the container neck portion wall are made of biodegradable plastics, at least the body portion wall being made of a material comprising 40 to 99.9 weight percent of polyhydroxyalkanoate (PHA)
Data Source
AI summary
The present invention relates to a plastic container for a liquid, comprising a body portion (1) and a neck portion (2). The body portion (1) comprises a body portion wall (3) forming a reservoir adapted to contain the liquid. The neck portion (2) is formed by a neck portion wall (6) that forms an opening (5) for filling the container with liquid and emptying the container. The container body portion wall (3) and the container neck portion wall (6) are made of biodegradable plastics at least the body portion (1) wall being made of a material comprising 40 to 99.9 weight percent of poly hydroxyalkanoate (PHA). The maximum thickness of the neck portion wall (6) is less than 2 mm, and preferably comprised between 1.2 mm and 1.6 mm. This enhances the biodegradability of the whole container.