Recyclable Resealable Pouch Sealing for High-Speed Rollstock Lines
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Solution Overview
Problem
Existing recyclable pouches with resealable closures are not suitable for high-speed production on conventional packaging equipment due to the need for high temperatures to integrate resealable closures, and current methods for producing such pouches are time-consuming and require specialized machinery.
Innovation Solution
A process for producing recyclable pouches with a resealable closure that extends to the edge of the pouch, using a multi-ply film with a temperature differential between layers, allowing high-speed production on a single manufacturing line by crushing and heat-sealing the edges of the closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high temperature is used to integrate resealable closure on recyclable pouch, then the closure can be properly sealed, but the pouch material integrity is compromised and production speed is reduced
Solution Approach 1:
The patent applies local quality by creating a temperature differential between the inner heat seal layer and outer heat resistant layer. The inner layer is heated to melting temperature for sealing, while the outer layer remains cooler to maintain structural integrity. This localized thermal approach enables proper closure sealing without compromising overall pouch material integrity, resolving the contradiction between sealing quality and production speed.
Solution Approach 2:
The patent employs composite materials by using a multi-layer pouch structure with an inner heat seal layer and outer heat resistant layer. This composite construction allows different parts of the pouch to experience different temperatures during closure integration, enabling high-speed production while maintaining both sealing quality and material integrity.
2Reliability
If multi-step process is used to produce recyclable pouches with resealable closure, then material integrity is maintained, but production time increases and equipment complexity increases
Solution Approach 1:
The patent merges multiple process steps into a single integrated operation. The formation, filling, and sealing operations are combined in one continuous process using standard packaging equipment, eliminating the need for specialized machinery and reducing production time while maintaining film integrity through controlled thermal processes.
Solution Approach 2:
The patent applies parameter changes by controlling temperature and pressure parameters during the single-step sealing process. By adjusting these parameters to match the differential melting temperatures of the pouch layers, the process achieves proper sealing without requiring complex multi-step procedures or specialized equipment.
3Ease of operation
If conventional resealable closure is used on recyclable pouch, then closure functionality is achieved, but heat resistance requirement conflicts with recyclability
Solution Approach 1:
The patent applies local quality by creating a temperature differential between the inner heat seal layer and outer heat resistant layer. The inner layer is heated to melting temperature for sealing, while the outer layer remains cooler to maintain structural integrity. This localized thermal approach enables proper closure sealing without compromising overall pouch material integrity, resolving the contradiction between sealing quality and production speed.
Solution Approach 2:
The patent employs composite materials by using a multi-layer pouch structure with an inner heat seal layer and outer heat resistant layer. This composite construction allows different parts of the pouch to experience different temperatures during closure integration, enabling high-speed production while maintaining both sealing quality and material integrity.
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
Enables high-speed production of recyclable pouches with resealable closures, achieving at least 70 pouches per minute, while maintaining the integrity of the film and eliminating the need for specialized machinery.
Implementation Method 1
the temperature of the crushing apparatus that contacts the pouch walls must be sufficiently high due to the short dwell time
Implementation Method 2
crushing edges of the resealable closure prior to or after heat sealing the pouch along its side edges
Implementation Method 3
heat sealing the pouch along its side edges
Implementation Method 4
applying heat and pressure to the folded film and applied elongate source of resealable closure to seal the elongate source of resealable closure to the heat seal layers
Data Source
Figure 1~2A
Figure 2B
Figure 2C~2D
AI summary
Recyclable pouches formed from rollstock and having a resealable closure that extends into both side edges of the pouch may be produced at high speeds on a single manufacturing line in which the pouches are formed, cut apart, filled, and then sealed if the film forming the pouch comprises a recyclable heat seal layer and a second recyclable layer having a melting temperature of at least 30 ºC greater than the heat seal layer.