Multilayer Bottle Barrier Layer Delamination Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer bottles face delamination issues due to mechanical and thermal impacts during filling, transportation, and dropping, and existing methods to improve delamination resistance compromise gas-barrier properties or increase production costs.
Innovation Solution
A method involving a multilayer bottle structure with specific conditions for the barrier layer, including a polyester resin for outer and innermost layers and a polyamide B barrier layer, optimized for interlaminar bonding strength and resistance to delamination, using a controlled oxygen transmission rate and molecular weight, and suitable for hot filling methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer bottle structure with polyamide MXD6 barrier layer is used to improve gas-barrier property, then oxygen transmission rate is reduced, but the bottle undergoes delamination between layers during filling and transportation
Solution Approach 1:
The patent changes the molecular weight parameter of the polyamide MXD6 barrier layer to a specific range (20,000-30,000) to optimize both gas-barrier property and interlaminar bonding strength. This parameter optimization prevents delamination while maintaining excellent oxygen transmission rate, resolving the contradiction between barrier performance and layer adhesion.
2Duration of action of stationary object
If polyamide MXD6 is used as barrier layer to achieve good gas-barrier property, then shelf life of contents is improved, but delamination occurs between innermost/outermost layer and intermediate layer
Solution Approach 1:
The patent optimizes the molecular weight of polyamide MXD6 to a specific range (20,000-30,000) to simultaneously achieve good gas-barrier property for extended shelf life and sufficient interlaminar bonding strength to prevent delamination during filling and transportation.
Solution Approach 2:
The patent uses a multilayer composite structure with specific resin combinations (PET for innermost and outermost layers, polyamide MXD6 for barrier layer) where each layer is optimized for its specific function while maintaining strong interlayer adhesion through controlled molecular weight and composition.
3Reliability
If transition metal-based catalyst is added to polyamide to improve oxygen-absorbing rate, then oxygen-barrier property is enhanced, but production cost increases
Solution Approach 1:
The patent replaces expensive transition metal-based catalysts with a cost-effective approach by optimizing the molecular weight of polyamide MXD6 itself, achieving excellent oxygen-barrier property without additional costly additives, thereby reducing production costs while maintaining high oxygen-absorbing rate.
4Strength
If considerable amount of amorphous polyamides is added to prevent crystallization, then delamination resistance is improved, but gas-barrier property deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of polyamide MXD6 to a specific range (20,000-30,000) that naturally provides both sufficient delamination resistance and excellent gas-barrier property, eliminating the need to add large amounts of amorphous polyamides that would compromise oxygen barrier performance.
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 method effectively prevents delamination and maintains excellent gas-barrier properties, ensuring the multilayer bottle's integrity and shelf life, even under various filling and handling conditions, while reducing production costs and environmental impact.
Implementation Method 1
a glass transition point (Tg) of the barrier layer satisfying the following condition (1): 65°C ≤ Tg ≤ 90°C
Implementation Method 2
an interlaminar bonding strength between layers of the multilayer bottle of 0.1 MPa or more
Implementation Method 3
a crystallization temperature of the barrier layer satisfying the following condition (3): 80°C ≤ crystallization temperature < 170°C
Implementation Method 4
an oxygen transmission rate of the barrier layer satisfying the following condition (4): 0.05 cc·mm/(m2·day·atm) ≤ OTR < 0.20 cc·mm/(m2·day·atm)
Data Source
AI summary
There is provided a method for filling a multilayer bottle including outermost and innermost layers and at least one barrier layer interposed between the outermost and innermost layers, with a material to be stored therein. In the filling method, the material to be stored is filled in the multilayer bottle having the barrier layer satisfying a specific glass transition point (Tg) and a specific water content as measured by a Carl-Fisher method at 230°C for 30 min. The multilayer bottle obtained by the filling method of the present invention hardly undergoes delamination between the layers owing to dropping or impact, and is applicable to a filling method such as hot filling.