Packaging Film With Tear Layer For Two-Dimensional Opening
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Solution Overview
Problem
Existing packaging films with predefined opening tracks are inadequate for articles that require a two-dimensional opening, such as condoms, as they are complex to manufacture and not suitable for protecting contents from external elements due to the need for a laminate tear-off section.
Innovation Solution
A packaging film design featuring a top layer, a bottom layer, and a tear layer that extends beyond the aperture, allowing the bottom layer to tear along the contour of the aperture when pulled, enabling easy manufacturing and various two-dimensional opening forms without weakening the bottom layer's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a laminate with metal foil is used to protect articles from external elements, then protection reliability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The packaging film is divided into three distinct layers: top layer, bottom layer, and intermediate tear layer. This segmentation allows each layer to have specific functions - the top and bottom layers provide protection with continuous metal foil, while the intermediate layer enables easy opening through tearing, thus reducing overall device complexity while maintaining protection reliability
Solution Approach 2:
The intermediate tear layer acts as a mediator between the top and bottom layers. It is adhered to both layers but designed to tear easily along a predefined track, allowing the package to be opened without compromising the protective function of the metal foil layers. This intermediary layer simplifies the opening mechanism while maintaining the integrity of the protective laminate
2Ease of manufacture
If a single layer unsupported strip is used for opening, then manufacturing process is simplified, but opening capability is limited to one direction
Solution Approach 1:
The opening track in the intermediate tear layer can be designed in various two-dimensional patterns (straight, curved, zigzag, circular) rather than being limited to a single linear direction. This dimensional flexibility allows the opening track to adapt to different article shapes and opening requirements while maintaining the simplicity of the single-layer tear mechanism
3Ease of operation
If the unsupported strip is made weaker than the tear seal, then tearing is enabled, but the strip cannot provide sufficient structural support
Solution Approach 1:
The intermediate tear layer is designed with locally differentiated properties: it is adhered to both the top and bottom layers to receive structural support, but simultaneously designed with reduced strength characteristics (through material selection, thickness control, or predefined weakness lines) to enable easy tearing. This local quality differentiation allows the layer to serve dual functions of support and easy opening
4Reliability
If a continuous bottom layer is used, then film integrity is improved, but opening requires tearing through the entire layer
Solution Approach 1:
The intermediate tear layer is pre-designed with a predefined opening track that indicates where the tear should occur. This preliminary action of creating a weakness line during manufacturing ensures that when the package is opened, the tear follows the predetermined path, maintaining film integrity in the bottom layer while simplifying the opening mechanism to a simple pull action
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 design simplifies the manufacturing process, allows for flexible packaging of articles that can be grasped centrally, and ensures the integrity of the film and contents, while providing a clean tear and protection from external elements.
Implementation Method 1
a tear layer (6) adhered to the bottom layer (8)
Implementation Method 2
upon traction on the tear layer (6), said layer (6) tears the bottom layer (8) through the aperture(s) (4.1)
Data Source
AI summary
The invention is directed to a packaging film (2) comprising: a top layer (4) with at least one aperture (4.1); a bottom layer (8) adhered to the top layer (4); a tear layer (6) adhered to the bottom layer (8) and extending along the at least one aperture (4.1) so that upon traction on the tear layer, said layer tears the bottom layer (8) through the aperture(s) (4.1). The tear layer (6) extends beyond the at least one aperture (4.1), between the top layer (4) and the bottom layer (8), preferably longitudinally in two opposite directions. The invention also relates to a condom wrapping with such a film and to the manufacturing method for such a film.