Resealable Packaging Adhesive Segmentation for Gas Tightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing resealable packaging fails to provide sufficient gas tightness, particularly for perishable foods like sausage and cheese, as it allows the escape of gases such as oxygen, nitrogen, or CO2, which compromises the durability of the packaged items.
Innovation Solution
A resealable packaging design featuring a homogeneous top film made of oriented polypropylene with a stable adhesive layer distribution, including a central permanent adhesive region and edge pressure-sensitive adhesive region, and a predetermined breaking line that separates the sealing foil layers, enhancing gas tightness and allowing for easy opening and resealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple lamination process is used to laminate the multi-layered film lid from two individual film layers immediately before being applied to the tray, then the manufacturing complexity is reduced, but the gas tightness against oxygen, nitrogen, and CO2 is insufficient
Solution Approach 1:
The adhesive layer is segmented into two distinct functional zones: a permanent adhesive area for initial sealing and a pressure-sensitive adhesive area for resealing. This segmentation allows the packaging to achieve both ease of manufacture through simple lamination and reliable gas tightness through differentiated adhesive functions in different regions of the lid structure.
Solution Approach 2:
Different adhesive properties are applied to different local areas of the lid structure. The permanent adhesive provides strong, gas-tight bonding in the central sealing region, while the pressure-sensitive adhesive enables convenient resealing at the edge area. This local differentiation of adhesive quality resolves the contradiction between simple manufacturing and reliable gas tightness.
2Ease of operation
If a predetermined breaking line is introduced through the top film and sealing film, then the packaging can be easily opened and resealed, but the mechanical stability and gas tightness of the sealed state are compromised
Solution Approach 1:
The breaking line is strategically positioned to pass only through the sealing film and not through the top film, creating a segmented failure path. This allows the packaging to be easily opened by tearing along the breaking line while maintaining the integrity and gas tightness of the top film and permanent adhesive bonding in the sealed state.
Solution Approach 2:
The adhesive layer acts as an intermediary element that bridges the top film and sealing film. By positioning the breaking line to pass through the sealing film while maintaining permanent adhesive bonding, the system enables easy opening through controlled tearing while preserving gas tightness through the adhesive-mediated connection in the sealed state.
3Stability of the object's composition
If the top film is made homogeneous and stable without predetermined breaking lines up to the outer edge, then the mechanical rigidity and stability are improved, but the ease of opening and resealing is reduced
Solution Approach 1:
The top film structure is segmented into a homogeneous stable region extending to the outer edge for mechanical stability, and a detachable edge strip region containing the breaking line for ease of opening. This segmentation allows the majority of the top film to maintain homogeneous stability while the edge portion enables convenient opening and resealing operations.
Solution Approach 2:
Different structural qualities are applied locally: the main body of the top film is made homogeneous and stable for mechanical strength, while the edge area incorporates a breaking line through the sealing film to enable easy opening. This local differentiation of structural quality resolves the contradiction between overall stability and localized ease of operation.
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 improves gas tightness, preventing gas exchange and ensuring the long-term durability of packaged foods by maintaining a high gas density in the sealed state while allowing for comfortable and easy opening and resealing.
Implementation Method 1
the adhesive layer has an inner central area in which the top film is permanently bonded to the sealing film by means of a permanent adhesive
Implementation Method 2
an outer edge area is further provided in which, at least in the sections where the top film is to detach from the sealing film, the top film and sealing film are detachably and resealed together by means of an adhesive, in particular a pressure-sensitive adhesive (PSA)
Data Source
Figure 1~2b
Figure 3~4
Figure 5
AI summary
The package has a film cover (3) a sealing film (7) freely supported as a layer stack construction on edge strips (2) of a bowl (1), and a top film (6) extending to an outer edge of the edge strips. The top film and the sealing film are attached with each other by an adhesive layer (8). Permanent adhesive is provided on an inner central region (10) of the adhesive layer, and reclosure enabling pressure sensitive adhesive is provided on an outer boundary region (11) of the adhesive layer. A break line (9) is provided between the outer boundary region and the inner central region. The sealing film is provided with a barrier layer that is impermeable for air, oxygen and carbon dioxide. The barrier layer comprises an oxide layer e.g. aluminum oxide layer, silicon oxide layer and polyamide layer. The bowl is made of a composite material such as plastic. Independent claims are also included for the following: (1) a prefabricated multi-layer film for producing a resealable package (2) a method for packing sliced food products.