Tape With Tearing Guide And Protrusions For Bag Opening
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Solution Overview
Problem
Typical packaging bags face difficulties in easy opening and content removal due to the alignment of cut edges and the presence of engagement portions that can block passage, making it hard to open and extract contents without tools or causing irregular tearing.
Innovation Solution
A tape with a tearing guide piece bonded to the inner surface of the bag body, which tears the film and base to create an opening, and protrusions that adjust the tearing direction without obstructing hand insertion or content passage, using a combination of materials with varying compatibility to ensure strong bonding and easy separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cutting string is used to tear the bag body, then the bag can be opened, but it is difficult for general bag-making machines to produce such bags and the cut edges align making finger insertion difficult
Solution Approach 1:
The base is divided into a bonded portion (attached to film) and an unbonded portion (exposed at opening), allowing the tearing guide piece to tear through the unbonded portion and create an opening without requiring complex machine intervention. This segmentation enables easy opening while maintaining compatibility with standard bag-making equipment.
Solution Approach 2:
The unbonded portion of the base acts as an intermediary element between the tearing guide piece and the film. It provides a path for the tearing guide piece to create an opening without requiring direct tearing of the film, simplifying the bag-making process while enabling easy opening.
2Strength
If the base is completely bonded to the film, then the tape is secure, but the opening cannot be easily formed and fingers cannot be inserted
Solution Approach 1:
The base is segmented into bonded and unbonded portions. The bonded portion maintains secure attachment to the film for strength, while the unbonded portion allows the tearing guide piece to create an opening easily. This segmentation resolves the contradiction between bonding strength and opening ease.
Solution Approach 2:
Different portions of the base have different bonding characteristics: the bonded portion has strong adhesion to maintain structural integrity, while the unbonded portion has no adhesion to allow easy tearing. This local differentiation of bonding quality enables both secure attachment and easy opening.
3Manufacturing precision
If protrusions are added to adjust tearing direction, then tearing direction is stabilized, but the structure becomes more complex
Solution Approach 1:
The protrusions are integrated directly into the base structure during extrusion, merging the tearing direction control function with the base itself. This integration achieves precise tearing direction control without adding separate components, thus minimizing structural complexity.
Solution Approach 2:
The base serves multiple functions: it provides structural support, maintains bonding to the film, and through its integrated protrusions, controls the tearing direction. This multi-functionality achieves precise manufacturing without increasing overall device complexity.
4Ease of operation
If the exposed portion of the base is large, then finger insertion is easy, but the engagement portion may block passage of contents
Solution Approach 1:
The base structure is designed with local quality differentiation: the unbonded portion provides sufficient exposure for finger insertion, while the engagement portion (male/female members) is positioned and shaped to minimize obstruction. This local optimization allows both easy finger insertion and content passage.
Solution Approach 2:
The protrusions extend in a direction perpendicular to the base surface, utilizing the vertical dimension to guide tearing without obstructing the horizontal passage of contents. This dimensional arrangement allows finger insertion and content passage without blockage.
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 opening and content removal without tools, stabilizes the tearing direction, and prevents irregular positioning or pinholes, ensuring a secure and efficient opening process.
Implementation Method 1
a tearing guide piece bonded to the base in a longitudinal direction of the base and configured to tear the base and the at least one film
Implementation Method 2
at least one protrusion protruding in a direction of the tearing guide piece from a surface of the base on which the tearing guide piece is bonded
Implementation Method 3
a tearing guide piece bonded to the base in a longitudinal direction of the base
Data Source
AI summary
A tape bondable to an inner surface of at least one of films forming a bag body is provided. The tape includes: at least one elongated base; a tearing guide piece bonded to the base in a longitudinal direction of the base and capable of tearing the base and the film; and at least one protrusion protruding in a direction of the tearing guide piece from a surface of the base to which the tearing guide piece is bonded. The protrusion is formed on a portion of the base where the tearing guide piece is not bonded.