Peelable Tamper-Evident Diaphragm for Flexible Packages
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Solution Overview
Problem
The existing manufacturing processes for tamper-evident flexible packages with re-closable closures, such as zippers, are costly and complex due to the need for co-extrusion of peelable polymer bands, which requires specialized machinery and skills, and do not ensure user comfort or high barrier properties.
Innovation Solution
A tamper-evident structure featuring two diaphragm strips with an outer and inner layer, sealed to form a non-resealable peelable band, which is cost-effective to manufacture and provides a smooth opening experience, using laminated materials like BOPP or PET for the outer layer and peelable polymers for the inner layer, with metallization for enhanced barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If co-extrusion of peelable polymer bands is used, then tamper-evident function is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The tamper-evident diaphragm is divided into multiple functional layers: an outer layer (BOPP or PET) providing structural integrity, an inner layer (peelable polymer) providing tamper-evident function, and a metallized layer providing barrier properties. This segmentation allows each layer to be manufactured separately and then laminated together, avoiding the need for complex co-extrusion machinery while maintaining the tamper-evident function.
Solution Approach 2:
The patent uses composite material construction by laminating different polymer layers with specific properties. The outer BOPP or PET layer provides strength and barrier properties, the inner peelable polymer layer provides tamper-evident functionality, and the metallized layer enhances barrier properties against moisture and oxygen. This composite approach achieves multiple functions without requiring complex co-extrusion processes.
2Ease of operation
If co-extrusion process is used, then peelable band is formed, but manufacturing cost increases
Solution Approach 1:
The peelable band is formed by separating the tamper-evident function into a distinct inner layer that can be manufactured independently using standard extrusion processes, rather than requiring co-extrusion. This inner layer is then laminated to the outer layer, simplifying the manufacturing process and reducing equipment requirements while maintaining the peelable characteristic.
Solution Approach 2:
The patent employs cost-effective materials such as BOPP or PET for the outer layer and standard peelable polymers for the inner layer, avoiding the need for expensive co-extrusion machinery. The laminated structure allows the use of cheaper, readily available materials that can be easily processed through conventional packaging manufacturing equipment.
3Ease of operation
If specialized machinery is used for co-extrusion, then peelable band is created, but production speed decreases
Solution Approach 1:
By segmenting the diaphragm into separate layers that can be manufactured independently using standard extrusion equipment, the production process becomes more flexible and faster. The inner peelable layer and outer structural layer can be produced on separate, high-speed extrusion lines and then laminated together, eliminating the need for slow, specialized co-extrusion machinery.
Solution Approach 2:
The patent replaces the mechanical co-extrusion process with a lamination process. Instead of requiring specialized co-extrusion equipment to simultaneously form multiple layers, the separate layers are laminated together using adhesive bonding or heat sealing, a process that can be performed on standard packaging equipment at higher speeds.
4Reliability
If tamper-evident diaphragm is sealed over peelable band, then barrier properties are provided, but manufacturing complexity increases
Solution Approach 1:
The patent integrates barrier properties into the composite structure itself rather than adding a separate sealing layer on top. The metallized layer within the laminated structure provides inherent barrier properties against moisture and oxygen, while the peelable polymer layer provides tamper-evident functionality. This integrated approach eliminates the need for separate sealing operations.
Solution Approach 2:
The patent merges the barrier function, tamper-evident function, and structural integrity into a single laminated diaphragm assembly. The outer BOPP or PET layer provides structural integrity and initial barrier properties, the inner peelable polymer layer provides tamper-evident functionality, and the metallized layer enhances barrier properties. This merging eliminates the need for separate sealing operations and reduces manufacturing complexity.
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 simplifies the manufacturing process, reduces costs, ensures a smooth and secure opening mechanism, and enhances the barrier properties of the flexible package while preventing resealing, thus addressing the need for cost-effectiveness and user comfort.
Implementation Method 1
The inner layer (136) is made of non-re-sealable peelable material and the inner layers (136) of both the diaphragms strips (112A and 116A) are heat-sealed to form a band (142A)
Implementation Method 2
Each of the diaphragm strips (112, 116) comprises an outer layer (140) and an inner layer (136). The inner layer (136) and the outer layer (140) of the diaphragm strips (112, 116) are laminated together
Implementation Method 3
EP 0 541 093 A1 discloses a packaging pouch having a laminate of easily peelable tapes secured by heat-bonding to laminates of the package body where an opening of the package is to be formed
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A tamper evident diaphragm (110) for a flexible package (300) is provided. The tamper evident diaphragm (110) includes two diaphragm strips (112, 116). Each of the diaphragm strips (112, 116) includes at least an outer layer (140) and an inner layer (136) laminated with each other. The inner layer (136) of each of the diaphragm strips (112, 116) is sealable together to form a non-resealable peelable sealed band (142). The outer layer (140) and the inner layer (136) are configured to be sealed with the flaps (120, 124) of a zipper (108) of the flexible package (300).