Polycarbonate Wine Bottle Epoxy Coating Oxygen Barrier
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Solution Overview
Problem
Traditional polymeric bottles for premium alcoholic beverages suffer from high gas permeability, leading to oxygen ingress and volatile aromatic compound egress, which causes deterioration and alters the flavor and smell of the contents, and they lack the aesthetic appeal and durability of glass bottles.
Innovation Solution
A lightweight polymer bottle with a polycarbonate wall coated on the interior and exterior with a thin film of epoxy or silicon oxide, such as 4,4′-isopropylidenedicyclohexanol and 1-chloro-2,3-epoxypropane crosslinked with 3-aminopropyltriethoxysilane, providing a passive barrier to oxygen and VOCs, while maintaining structural integrity and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If polymeric bottles (PET) are used to replace glass bottles, then weight is reduced and breakage resistance is improved, but gas permeability increases leading to oxygen ingress and VOC egress
Solution Approach 1:
The patent applies composite materials by combining a polymeric bottle body (PET or similar polymer) with an interior coating layer (silicon oxide, epoxy, or other barrier coating). This composite structure leverages the lightweight and durable properties of the polymer while the coating layer provides the oxygen and VOC barrier properties that the polymer lacks, thus resolving the contradiction between weight reduction and oxygen transfer resistance.
2Weight of moving object
If polymeric bottles are used to replace glass bottles, then weight is reduced and breakage resistance is improved, but aesthetic appeal and premium market acceptance deteriorate
Solution Approach 1:
The patent addresses aesthetic appeal by specifying that the interior coating can be applied in various colors including clear, green, brown, or other hues traditionally associated with premium wine bottles. This allows the polymeric bottle to achieve the aesthetic characteristics of glass bottles while maintaining the weight and durability advantages of polymer materials.
3Ease of manufacture
If stretch blow molded PET bottles are used, then manufacturing ease and productivity are improved, but the bottles become deformable by manual compression
Solution Approach 1:
The patent resolves this contradiction by changing the wall thickness parameter to a minimum of 1.5 mm, which is thicker than typical stretch blow molded PET bottles. This increased thickness provides resistance to manual compression and deformation while still allowing the bottle to be manufactured using standard blow molding processes. The coating layer is also applied to withstand the stresses of filling and handling operations.
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 coated polymer bottle effectively limits oxygen transfer and VOC egress, ensuring the quality and longevity of premium beverages, offering a durable, lightweight, and aesthetically appealing alternative to glass bottles with a longer shelf life.
Implementation Method 1
a polycarbonate wall coated on the interior and exterior with a thin film of epoxy or silicon oxide, such as 4,4′-isopropylidenedicyclohexanol and 1-chloro-2,3-epoxypropane crosslinked with 3-aminopropyltriethoxysilane, providing a passive barrier to oxygen and VOCs
Data Source
AI summary
A container for alcohol, e.g., a wine bottle, formed of a polycarbonate wall sandwiched between exterior and interior coatings, at least one of which may be an epoxy of 4,4′-isopropylidenedicyclohexanol and 1-chloro-2,3,-epoxypropane, crosslinked with 3-aminopropyltriethoxysilane. The polycarbonate wall may be an extrusion blow molded monolithic form at least 1.5 mm thick, and either or both of the exterior coating and the interior coating may have a thickness between 1 nm and 100 μm, inclusive.