Sheet-Like Packaging Laminate With DSC-Defined Sealing Layer
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Solution Overview
Problem
Existing packaging systems for foodstuffs, such as cans and jars, face challenges including limited space efficiency, high weight, energy consumption, and inadequate sealing properties, which can lead to damage during heating and insufficient adhesion between layers.
Innovation Solution
A sheet-like composite with a specific polymeric intermediate layer characterized by differential scanning calorimetry peaks A and B, where TB is at least 3°C wider than TA, and a carrier and barrier layer, providing improved sealing properties and adhesion, allowing for a wider temperature range during sealing and reduced sensitivity to heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional laminate sealing is used, then sealing can be achieved, but the temperature range is narrow and damage may occur at high temperatures
Solution Approach 1:
The patent modifies the thermal properties of the polymeric intermediate layer by controlling the crystallinity through specific cooling rates during extrusion. This creates a narrow melting range (peak B width ≤ 3°C) that provides a broad sealing window without damage, resolving the contradiction between temperature range and damage prevention.
Solution Approach 2:
The patent uses a composite polymeric intermediate layer with specific composition (polyethylene with controlled crystallinity) that combines the benefits of thermal stability and controlled melting behavior, enabling sealing across a wide temperature range without laminate damage.
2Strength
If conventional polymeric intermediate layer is used, then adhesion is provided, but adhesion is insufficient under thermal stress
Solution Approach 1:
The patent controls the crystallinity parameter of the polymeric intermediate layer through specific cooling rates during extrusion. This creates a material that maintains strong adhesion at processing temperatures while providing thermal stability during sealing, resolving the contradiction between adhesion strength and thermal stability.
Solution Approach 2:
The patent creates different local properties within the polymeric intermediate layer by controlling crystallinity distribution. The amorphous regions provide adhesion while the crystalline regions provide thermal stability, enabling the layer to perform both functions simultaneously under thermal stress.
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 composite offers enhanced sealing capabilities with a broader operating window, improved adhesion between layers, and reduced sensitivity to heat, resulting in more durable and efficient food packaging.
Implementation Method 1
a graph of differential scanning calorimetry of the polymeric intermediate layer includes a peak A at a temperature TA and a peak B at a temperature TB
Implementation Method 2
Sealing here is accomplished by introduction of heat into the laminate, by means of hot air, for example. The laminate therefore undergoes regional heating
Data Source
AI summary
The invention relates to a sheet-like composite including as layers of a layer sequence, in a direction from an external side of the sheet-like composite to an internal side of the sheet-like composite, a) a carrier layer, b) a polymeric intermediate layer, and c) a barrier layer, where a graph of differential scanning calorimetry of the polymeric intermediate layer includes a peak A at a temperature TA and a peak B at a temperature TB, where the temperature TB is more than the temperature TA, where a width of the peak B is less by at least 3° C. than a width of the peak A. The invention further relates to a container precursor and to a closed container including the sheet-like composite, and also to a process by which the sheet-like composite is obtainable, and to a use of the sheet-like composite.