Laminated Packaging Material Slit Design for Straw Penetration
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Solution Overview
Problem
Current laminated packaging materials without aluminum foil require higher penetration forces for straw use, making them unsuitable for consumer-friendly packaging, and also face manufacturing complexities due to pre-punching holes in the core layer.
Innovation Solution
A laminated packaging material with a bulk layer of paper or paperboard, a non-metal barrier film or sheet with minimal metal content, and slit design that reduces penetration force while maintaining gas barrier properties, eliminating the need for aluminum foil and minimizing metal usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-metal barrier film is used to replace aluminum foil, then the environmental profile is improved and metal content is reduced, but the penetration force required for straw use increases to unacceptable levels
Solution Approach 1:
The barrier film is designed with spatially varying properties: it has high barrier performance in the bulk while incorporating localized weak points or slits that reduce penetration force. This allows the material to maintain its gas barrier function while enabling easy straw insertion through controlled local modifications.
Solution Approach 2:
Weak points or slits are pre-formed in the barrier film during manufacturing before the packaging is sealed. This preliminary action creates predetermined paths that reduce the penetration force required during straw insertion while the film remains intact during storage and transport.
2Ease of operation
If pre-punching holes is done in the core layer to enable straw use, then penetration force is reduced, but manufacturing complexity increases due to confetti issues
Solution Approach 1:
The problematic confetti generation step is extracted and eliminated from the manufacturing process. Instead of punching holes that create waste confetti, the invention uses alternative methods such as laser cutting, ultrasonic cutting, or thermal slitting that remove or seal the material without creating scattered confetti waste.
Solution Approach 2:
The mechanical punching process is replaced with non-mechanical or softer processing methods such as laser cutting, ultrasonic vibration cutting, or thermal slitting. These methods achieve the same function of creating weak points for straw insertion without the messy confetti problem associated with traditional mechanical punching.
3Reliability
If aluminum foil is used in the packaging laminate, then gas barrier properties are achieved, but metal content increases and environmental profile deteriorates
Solution Approach 1:
The invention changes the material parameters by replacing metal-based barrier films with non-metal alternatives that have comparable or superior barrier properties. This involves using polymers with specific crystallinity, orientation, or composite structures that provide oxygen and carbon dioxide barrier performance without metal content.
Solution Approach 2:
The packaging laminate uses composite non-metal barrier films that combine multiple materials to achieve the desired gas barrier properties. These composites may include layered polymer structures, nanocomposites, or coated films that provide superior barrier performance compared to traditional aluminum foil while maintaining an environmentally friendly profile.
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 significantly decreases the penetration force required for straw use to acceptable levels, maintains low oxygen transmission rates, and simplifies the manufacturing process by eliminating 'confetti' issues from pre-punching, enhancing the environmental profile and cost-efficiency.
Implementation Method 1
a barrier film or sheet (26) being laminated between the bulk layer (20) and the second, innermost liquid tight layer (24)... the bulk layer (20) and the barrier film or sheet (26) together form a main layer (28)... maintains low oxygen transmission rates
Implementation Method 2
The main layer (28) is provided with at least one slit (30)... significantly decreases the penetration force required for straw use to acceptable levels
Implementation Method 3
a first, outermost liquid tight layer (22), arranged on the outside of the bulk layer (20)... a second, innermost liquid tight layer (24) arranged on the inside of the bulk layer (20)... laminating an at least proportionately non-metal barrier film or sheet (26) to said bulk layer (20)
Data Source
AI summary
A laminated packaging material for packaging of liquid food products, a respective manufacturing method and a packaging container are provided. The laminated packaging material comprises a bulk layer of paper or paperboard or other cellulose-based material, a first outermost liquid tight layer, a second innermost liquid tight layer and a non-metal barrier film or sheet being laminated between the bulk layer and the second, innermost liquid tight layer, wherein the bulk layer and the barrier film or sheet together form a main layer. The main layer is provided with at least one slit being covered at least by the second innermost liquid tight layer.