Syrup Dispensing Cup Barrier Layers for Oxygen and Flavor Protection
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Solution Overview
Problem
PET-based dispensing cups for carbonated beverages face challenges in maintaining storage stability and organoleptic properties due to oxygen penetration and flavor scalping, leading to a need for improved barrier properties and extended shelf life without compromising processing and packaging performance.
Innovation Solution
The use of PET-based co-polyester resins with specific diacid and diol co-units incorporated at specific mole percentages to enhance rheological properties for injection molding and heat sealing, forming sealing layers with a different co-monomer composition to improve barrier properties and shelf life, while minimizing oxygen and water vapor transmission rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PET-based containers are used for dispensing cups, then mechanical properties and cost are improved, but oxygen penetration and storage stability deteriorate
Solution Approach 1:
The patent applies composite materials by combining PET with EVOH (ethylene vinyl alcohol) and/or PVDC (polyvinylidene chloride) to create a multi-layer barrier structure. The PET layer provides mechanical strength and cost-effectiveness, while the EVOH and PVDC layers provide superior oxygen and aroma barrier properties, resolving the contradiction between mechanical properties and storage stability.
2Strength
If PET-based containers are used for dispensing cups, then mechanical properties and cost are improved, but flavor scalping and organoleptic properties deteriorate
Solution Approach 1:
The patent uses composite materials with EVOH and/or PVDC layers that act as barrier layers preventing flavor scalping. These layers have low affinity for flavor compounds, preventing the PET material from absorbing and retaining flavors that would otherwise contaminate subsequent contents, thus maintaining organoleptic properties while preserving mechanical strength.
3Reliability
If barrier properties are improved to extend shelf life, then storage stability is improved, but processing and packaging performance may deteriorate
Solution Approach 1:
The patent segments the dispensing cup into multiple functional layers: an inner barrier layer (EVOH/PVDC) for oxygen and flavor protection, and an outer PET layer for mechanical strength and processing. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturability through established multi-layer molding techniques.
Solution Approach 2:
The composite material structure combines materials with complementary properties: EVOH/PVDC for barrier performance and PET for processability. The synergistic combination maintains ease of manufacture through compatible processing parameters while achieving superior storage stability and extended shelf life.
Data Source
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AI summary
Syrup dispensing cups are provided that include a body structure that includes a first polyester or co-polyester resin with one or more first co-monomers incorporated into the first resin at a first mol % and having an intrinsic viscosity from about 0.45 dL/g to about 1.3 dL/g when measured at a temperature of 25C. The body structure has a first opening that is sealed with a first sealing layer and a second opening sealed with a second sealing layer, in which each sealing layer includes a second PET-based co-polyester resin having one or more second co-monomers incorporated into the second resin at a second mol %, and the ratio of the first mole % to the second mol % is less than 1. Methods for or enhancing the shelf-life of syrup dispensing cups are also provided.