Cutting Tape for Easy-Open Packaging Bags
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Solution Overview
Problem
Existing packaging bags with reinforcement strings or guiding tapes are complex to produce and not versatile, and when opened, the torn edges are difficult to separate, making it hard to easily open the bag without resistance.
Innovation Solution
A cutting tape with a leading portion and a base laminated with non-compatible resins is attached to the inner surface of the packaging bag, allowing for easy linear tearing and opening, as the weak bond between the resins enables easy peeling and reduces tearing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reinforcement string and guiding tape are separately attached to achieve linear tearing, then tearing guidance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the reinforcement string and guiding tape into a single integrated cutting tape structure. The cutting tape includes a base layer with a reinforcing layer laminated on it, forming one component that performs both guidance and reinforcement functions simultaneously, eliminating the need for separate attachment processes
Solution Approach 2:
The cutting tape serves multiple functions: it guides linear tearing, reinforces the tearing area to prevent irregular ripping, and creates a self-opening mechanism through its asymmetric design where one end is fixed and the other is free to be pulled
2Manufacturing precision
If cutting string is used to linearly tear packaging bag, then linear tearing is improved, but manufacturing versatility deteriorates
Solution Approach 1:
The cutting tape applies reinforcement locally only where needed - at the tearing initiation point and along the intended tear line. The base layer provides structural support while the reinforcing layer is strategically positioned to guide tearing without requiring special manufacturing equipment throughout the entire bag
3Ease of operation
If films are torn apart from notches to open packaging bag, then opening is achieved, but tearing resistance increases making it difficult to open
Solution Approach 1:
The cutting tape is pre-installed on the packaging bag during manufacturing, with one end fixed to the bag body and the other end extending outward. This preliminary setup creates a built-in pulling mechanism that reduces the force needed by the consumer to open the bag, as they simply need to pull the free end rather than tear through the sealed films directly
4Manufacturing precision
If two films are aligned at cut edge after tearing, then tearing is completed, but ease of operation deteriorates as fingers cannot be easily inserted
Solution Approach 1:
The cutting tape creates a segmented opening structure where the tape itself forms a distinct element between the two film layers. The free end of the cutting tape extends beyond the cut edge, creating a gap or space that allows fingers to easily insert and grip for opening, while the laminated structure maintains proper alignment of the films
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 cutting tape allows for easy and efficient opening of the packaging bag without resistance, enabling linear tearing and easy attachment to typical bag-making machines, enhancing the easy-open performance and production efficiency.
Implementation Method 1
a leading portion that is welded in a belt shape on the inner surface for the bag body
Implementation Method 2
a base having a laminated portion, which is laminated on a surface of the leading portion
Data Source
AI summary
A cutting tape includes a leading portion, a first base, a second base and a seal layer. The leading portion is welded on a sealant layer with the seal layer interposed therebetween. The first base and the second base, which are laminated on the leading portion, respectively include thin laminated portions and body portions to be welded on the sealant layer. The laminated portions are welded on the leading portion. The body portions respectively have a substantially trapezoidal cross section projecting toward the sealant layer and having an inclined surface adjacent to the leading portion.