Transparent Polyester Sheet with Grooves for Snappable Packaging
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Solution Overview
Problem
Current packaging solutions for dairy products using polystyrene polymer compositions are opaque and lack the desired transparency and rigidity, making them unsuitable for snappable, multi-segment packaging that can withstand its own weight without premature separation.
Innovation Solution
A polyester sheet with grooves that are at least 50% deeper than its thickness, made from amorphous poly(ethylene terephthalate), providing the necessary rigidity and transparency while allowing for predictable snapping along defined paths without breaking under its own weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polystyrene polymer compositions are used for packaging, then the packaging can be formed into multi-segment packages that are snappable, but the packaging becomes opaque and insufficiently transparent
Solution Approach 1:
The patent changes the material parameter from polystyrene to polyester, which fundamentally alters the optical properties from opaque to transparent while maintaining the snappable characteristic through controlled groove depth and material selection
Solution Approach 2:
The patent uses polyester as a composite material that combines transparency with the mechanical properties needed for snappability, replacing the traditional opaque polystyrene material
2Illumination intensity
If transparent polyester sheets are used, then the packaging achieves transparency and glossy appearance, but the sheets do not provide sufficient ability to snap
Solution Approach 1:
The patent introduces grooves that segment the polyester sheet into distinct sections, creating predetermined break paths that enable controlled snapping while maintaining the overall structural integrity and transparency of the material
Solution Approach 2:
The patent applies local modification by creating grooves with specific depth characteristics (>50% of sheet thickness) at predetermined locations, which locally enhances snapability without compromising the overall transparency and rigidity of the polyester sheet
3Strength
If the packaging is made sufficiently rigid to withstand its own weight, then premature snapping under weight is prevented, but the packaging becomes difficult to separate manually
Solution Approach 1:
The patent segments the sheet into multiple segments using grooves, allowing the package to maintain overall rigidity while enabling easy manual separation along the groove-defined paths when needed
Solution Approach 2:
The patent creates localized weakness at the groove locations while maintaining overall sheet rigidity, allowing the package to resist its own weight through the bulk material while enabling easy separation at the groove locations through controlled breaking
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 enables the production of transparent, snappable packaging that maintains structural integrity under weight, allowing for easy manual separation of segments while maintaining a glossy appearance and sufficient rigidity.
Implementation Method 1
the area where the segments are to be separated may for example be an area that is able to snap; that is, an area where the sheet may be broken into the individual segments along a pre-defined path
Implementation Method 2
Snapping by twisting or tearing is not desirable as the package separation becomes difficult for the consumer
Implementation Method 3
Such polyester may be provided as a transparent sheet. For example, such transparent sheet may comprise an amorphous polyester
Implementation Method 4
the sheet comprises at least one area (a) wherein the area (a) comprises at least one groove having a depth of >50 % with regard to the thickness of the sheet in the area (a)
Data Source
Figure 1
AI summary
The present invention relates to a sheet comprising polyester, the sheet comprising at least one area (a) wherein the area (a) comprises at least one groove having a depth of >50 % with regard to the thickness of the sheet in the area (a), wherein the sheet has a thickness of 200 – 1000 µm in the area (a). Such sheet provides the ability to snap along the grooves in a predictable manner, whilst providing sufficient rigidity to avoid undesired bending under the influence of its own weight.