Packaging Container Longitudinal Seam for Manual Tearing
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Solution Overview
Problem
Packaging containers made of flat film that are sealed or welded into a tubular shape face challenges in being both easy to open by hand and maintaining robustness and leakproofness, as existing solutions either compromise on strength or require complex layering and imperfect sealing.
Innovation Solution
Designing the longitudinal seam with limited peel strength, allowing it to be easily torn open by hand, while maintaining the robustness of transverse seams through techniques like release varnish, corona pretreatment, or adhesive application, ensuring the seam can withstand normal loads without compromising the container's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the packaging container is made robust and leakproof through strong sealing, then the container integrity is improved, but the ease of manual opening deteriorates
Solution Approach 1:
The patent applies different sealing strengths to different locations of the container. The transverse seams (bottom and top seals) are made with strong sealing to ensure container integrity and leakproofness, while the longitudinal seam is deliberately made weaker to enable easy manual opening. This local differentiation of sealing quality resolves the contradiction between robustness and ease of opening.
2Ease of operation
If perforations or weak sealing are introduced to enable easy opening, then the ease of opening is improved, but the robustness and tightness deteriorate
Solution Approach 1:
The invention avoids introducing perforations or weak sealing throughout the entire container. Instead, only the longitudinal seam is designed with reduced sealing strength, while the transverse seams maintain full sealing capability. This localized approach allows easy opening along the longitudinal seam without compromising the overall tightness and robustness of the container.
3Ease of operation
If complex layering and lining are applied to achieve easy tearing, then the ease of opening is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent achieves easy tearing without complex layering by changing the sealing parameters of the longitudinal seam. Specifically, the sealing strength, sealing temperature, or sealing pressure is adjusted to create a deliberately weaker bond compared to conventional sealing. This parameter modification enables easy manual opening while maintaining a simple single-layer film structure and straightforward manufacturing 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
Enables easy manual opening of packaging containers without tools while maintaining structural integrity and leakproofness, using familiar manufacturing processes and machines with minimal modifications.
Implementation Method 1
corona pretreatment
Implementation Method 2
release varnish
Data Source
Figure 1
Figure 2~5
Figure 6~9
AI summary
The method involves sealing or welding a single or multi-layered film with an internal layer, and merging the single or multi-layered film and the internal layer as a flat film in a tubular form. A longitudinal seam (2) is formed between folded longitudinal edges for forming a tube. The bottom of the tube is closed by transverse bottom seams (3) for forming an open packaging container (1). The top of the tube is closed by a transverse top seam (4), where the longitudinal seam is formed as a hand-tearable seam. Independent claims are also included for the following: (1) a tubular film for manufacturing a packaging container (2) a packaging container comprising a hand-tearable longitudinal seam.