Composite Packaging Seal Using Plastic Deformable and Springback Sheets
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Solution Overview
Problem
The packaging industry faces challenges in creating airtight seals using sheet materials with springback characteristics, such as polypropylene and polythene, which are replacing traditional aluminum foil, as these materials tend to revert to their original shape, making it difficult to apply existing packaging techniques without accessory elements like heat deformation tools.
Innovation Solution
A method involving a combination of a plastically deformable first sheet and a second sheet with springback properties, where the second sheet is metalized and includes a polythene layer for intimate connection, using thermal or ultrasonic welding to create an airtight seal by 'tacking' and then fully welding the sheets together, transferring the plastic deformability characteristics to the composite material to stabilize the shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet materials with springback characteristics (polypropylene, polythene) are used to replace aluminum foil, then barrier properties and environmental compatibility are improved, but the ability to maintain deformed shape and create airtight seals deteriorates
Solution Approach 1:
The patent applies composite materials by combining a plastically deformable first sheet (aluminum foil) with a second sheet having springback characteristics (polypropylene or polythene). This composite structure allows the first sheet to provide permanent shape retention while the second sheet contributes barrier properties and environmental compatibility. The intimate connection between the two sheets through thermal or ultrasonic welding creates a unified material system that exhibits both plastic deformability and enhanced barrier performance.
Solution Approach 2:
The patent changes the physical parameters of the sheet materials by selecting specific material combinations with complementary properties. The first sheet is chosen for its plastic deformability (ability to maintain deformed shape), while the second sheet is selected for its springback characteristics and barrier properties. By controlling the welding parameters (thermal or ultrasonic) and material thicknesses, the patent optimizes the balance between shape stability and barrier functionality.
2Stability of the object's composition
If traditional aluminum foil is used for packaging, then shape retention and airtight sealing are improved, but environmental impact and barrier properties against organoleptic contamination worsen
Solution Approach 1:
The patent creates a composite packaging structure where the first sheet (aluminum foil) provides shape retention and airtight sealing capabilities, while the second sheet (polypropylene or polythene) reduces environmental impact and enhances barrier properties. This composite approach allows the package to benefit from both material types without the drawbacks of using either material alone.
Solution Approach 2:
The patent applies local quality by assigning different functional roles to different parts of the packaging structure. The first sheet (aluminum foil) is positioned to provide structural integrity and shape retention where needed, while the second sheet (polypropylene or polythene) is integrated to provide environmental compatibility and enhanced barrier properties in contact with the product. Each material is optimized for its specific function within the composite structure.
3Reliability
If accessory elements like heat deformation tools are used to shape springback materials, then airtight sealing capability is improved, but device complexity and manufacturing cost worsen
Solution Approach 1:
The patent eliminates the need for accessory elements by using a composite material structure where the plastically deformable first sheet inherently provides the necessary shape retention and airtight sealing capability. The second sheet with springback characteristics is integrated into the composite, allowing the combination to maintain deformed shapes without requiring additional heat deformation tools or accessory elements during the packaging process.
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
This method enables the creation of airtight packages with reduced environmental impact, effective barrier properties, and aesthetic appeal, while being easily applicable without the need for accessory elements, effectively extending the shelf life of food products by maintaining the seal.
Implementation Method 1
a first sheet (1) made of a lamina of plastically (or permanently) deformable material
Implementation Method 2
a second sheet (2) made of a lamina of a material exhibiting springback
Implementation Method 3
using thermal or ultrasonic welding to create an airtight seal by 'tacking' and then fully welding the sheets together
Implementation Method 4
using thermal or ultrasonic welding to create an airtight seal
Implementation Method 5
the second sheet is metalized and includes a polythene layer for intimate connection
Data Source
AI summary
A method for wrapping a product in a sheet material wrapper employing a first sheet of plastically deformable sheet material (for example aluminium) and a second sheet of wrapping material (for example a plastic film) having springback. Once the product is placed on the first sheet, the second sheet is applied on the product providing in the second sheet a part wrapping the product and a part facing the first sheet. The first sheet and the part of said second sheet facing it are airtight-seal coupled so to form, by effect of the coupling, a plastically deformable composite sheet material against the product or to form an integral housing cup.