Reclosable Packaging Bag Linear Edge Formation
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Solution Overview
Problem
Existing reclosable packaging bags face challenges in forming a linear level difference between the edges of the opening parallel to the zipper, leading to difficulties in recognizing the zipper position and opening/closing the bag conveniently.
Innovation Solution
A packaging bag configuration featuring linear first and second cut sections in the laminated films, formed at different levels and parallel to the zipper, facilitates easy opening and closing by ensuring a linear level difference between the edges of the opening, regardless of the direction of force applied during unsealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the edges of front surface film and back surface film coincide at the opening, then the packaging bag structure is simple, but it becomes difficult to hold only one film by finger tips and form a linear level difference
Solution Approach 1:
The patent applies asymmetry by intentionally creating a level difference between the front surface film edge and back surface film edge at the opening. The back surface film edge is positioned lower than the front surface film edge, forming an asymmetric structure that provides a finger tip holding surface and enables easy grasping and operation of the zipper.
2Adaptability or versatility
If the upper section is cut off non-linearly, then the cutting process is flexible, but the edge of the opening is not formed linearly with respect to the zipper and the level difference is not formed
Solution Approach 1:
The patent applies preliminary action by pre-forming a linear cut section in the packaging bag body before the final cutting step. This pre-formed guide structure ensures that when the upper section is cut off, the cut follows a linear path that forms a precise linear edge at the opening, creating the required level difference with the zipper alignment.
3Loss of information
If indication marks are printed on the packaging bag, then the cut direction can be indicated, but the cut direction is not determined by the indication mark
Solution Approach 1:
The patent introduces an intermediary element - a pre-formed linear cut section - that acts as a physical guide between the indication mark and the actual cutting process. This intermediary structure ensures that the cut follows the intended linear direction, reliably translating the indicated cut direction into actual cutting behavior.
4Shape
If a curved cut line is formed, then the unsealing line becomes smooth, but the edge of the opening is not formed linearly with respect to the zipper
Solution Approach 1:
The patent applies segmentation by dividing the cut structure into two distinct parts: a curved unsealing line for smooth opening and a separate linear cut section for precise edge formation. The linear cut section is positioned to align with the zipper, ensuring that the opening edge is formed linearly with respect to the zipper while the unsealing line remains smooth and curved.
Data Source
AI summary
A packaging bag is formed in a bag shape by overlapping of a laminated film and a laminated film facing each other, and unsealed by cutting of a predetermined section. The packaging bag includes a zipper for opening and closing an opening, the zipper being provided along edges of the opening formed by the unsealing, a linear cut section that is formed in a functional layer of the laminated film so as to be parallel to the zipper, and becomes the edge of the opening by the unsealing of the packaging bag, and a linear cut section that is formed at a different level from the cut section in a functional layer of the laminated film so as to be parallel to the zipper, and becomes the edge of the opening by the unsealing of the packaging bag.