Non-Foil Laminated Pouch Material for Liquid Food Packaging
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Solution Overview
Problem
Conventional packaging materials for liquid food and beverages require aluminum foil for gas-tightness, which is costly and environmentally unfriendly, and lack sufficient light barrier and mechanical strength for pouch-type packages, necessitating a cost-efficient non-foil laminated pouch material with improved gas, water vapor, and light barrier properties.
Innovation Solution
A non-foil laminated pouch material comprising two paper layers sandwiched by intermediate thermoplastic layers, with a gas barrier coating layer and a metal vapor deposition coating layer, using polymers like PVOH and inorganic particles to enhance barrier properties, and heat sealable thermoplastic polymer layers for induction heat sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aluminum foil is used in the packaging laminate, then gas barrier properties are excellent, but manufacturing cost increases and environmental friendliness deteriorates
Solution Approach 1:
The patent changes the material parameters by replacing aluminum foil with a composite polymer barrier layer consisting of EVOH and PVDC polymers. This polymer-based barrier layer provides comparable gas barrier properties to aluminum foil while reducing manufacturing cost and improving environmental compatibility, as polymers can be processed more efficiently and are more readily recyclable.
Solution Approach 2:
The patent employs a composite material structure using multiple polymer layers (EVOH and PVDC) combined in a laminate configuration. This composite polymer barrier system achieves gas barrier performance equivalent to aluminum foil through the synergistic effect of different polymer materials, each contributing specific barrier properties against oxygen and water vapor transmission.
2Ease of manufacture
If aluminum foil is removed from the packaging laminate, then manufacturing cost decreases and environmental friendliness improves, but light barrier properties and mechanical strength deteriorate
Solution Approach 1:
The patent uses a composite laminate structure combining multiple paper layers with polymer barrier layers and aluminum vapor deposition. The paper layers provide mechanical strength and structural integrity, while the polymer and vapor deposition layers provide barrier properties. This composite approach eliminates the need for bulk aluminum foil while maintaining overall package strength through the synergistic combination of materials.
Solution Approach 2:
The patent replaces the mechanical barrier function of aluminum foil with a combination of polymer barrier layers and vapor deposition coating. The aluminum vapor deposition layer provides both light barrier properties and enhanced mechanical strength, while the EVOH and PVDC polymer layers provide the primary barrier function, substituting the multi-functional role of aluminum foil with a distributed material system.
3Ease of manufacture
If aluminum foil is removed from the packaging laminate, then manufacturing cost decreases and environmental friendliness improves, but light barrier properties deteriorate
Solution Approach 1:
The patent replaces the light barrier function of aluminum foil with an aluminum vapor deposition layer. This vapor deposited aluminum coating applied to the paper substrate provides effective light blocking properties similar to aluminum foil, while using significantly less aluminum material. The thin vapor deposition layer is sufficient to block light transmission while reducing material cost and environmental impact.
Solution Approach 2:
The patent applies aluminum vapor deposition only to specific areas of the packaging laminate where light barrier properties are most critical, rather than using bulk aluminum foil throughout. The vapor deposition is applied to the paper layers in controlled patterns, providing localized light barrier protection where needed while minimizing overall aluminum content and manufacturing cost.
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 provides a cost-efficient, durable, and flexible packaging material with improved gas, water vapor, and light barrier properties, maintaining package integrity and aseptic storage capabilities comparable to aluminum foil-based materials.
Implementation Method 1
a gas barrier coating layer, applied onto one or both sides of the first paper layer
Implementation Method 2
a metal vapour deposition coating layer applied onto or arranged on the inner side of the, thus optionally coated, first paper layer
Implementation Method 3
an outermost layer of liquid tight, heat sealable thermoplastic polymer material on the opposite side of the packaging laminate, applied on the outer side of the second paper layer
Data Source
Figure 1a~1d
Figure 2
Figure 3
AI summary
The present invention relates to a non-foil packaging laminate for liquid food packaging comprising two or more layers of paper or other cellulose-based material, outermost liquid tight, heat sealable layers of polyolefin-based polymers, and barrier layers coated onto the inner side of the first layer of paper or cellulose-based material. The invention also relates to a method for manufacturing the packaging laminate and to a packaging container that is made from the packaging laminate.