Rectangular-bottomed bag side seal extraction for shape retention
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Solution Overview
Problem
Conventional rectangular-bottomed packaging bags with isosceles right triangle pockets often fail to maintain their designed shape, leading to distorted open states and compromised self-standing properties and external appearance quality due to issues with side seal protrusions.
Innovation Solution
The packaging bag features a design with a rectangular bottom, inclined joining portions, and fixed sealing portions that form an isosceles right triangle shape, improving shape retention and self-standing capabilities by ensuring the side joining portions are integrated and sealed effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an isosceles right triangle pocket is formed at the overlapping portion of the bottom gusset and side portion gusset, then the bag can stand upright, but the pocket shape becomes distorted and the external appearance quality deteriorates
Solution Approach 1:
The patent extracts the side seal from the overlapping region between the bottom gusset and side portion gusset. By positioning the side seal at the end edge of the side portion gusset rather than at the overlapping portion, the design eliminates the interference between the seal and gusset formation, allowing the isosceles right triangle pocket to maintain its precise geometric shape while still enabling the bag to stand upright.
Solution Approach 2:
The patent performs preliminary positioning of the side seal at the end edge of the side portion gusset before the gussets are folded and sealed. This preliminary action ensures that the side seal does not interfere with the formation of the isosceles right triangle pocket, allowing the pocket to be formed with accurate dimensions and proper shape retention.
2Ease of manufacture
If the side seal protrudes outward from the bag at the overlapping portion of gussets, then the gussets can be joined, but the appearance of the rectangular-bottomed packaging bag is obstructed
Solution Approach 1:
The side seal is extracted from the overlapping region of the bottom gusset and side portion gusset, and repositioned to the end edge of the side portion gusset. This extraction eliminates the visual obstruction caused by the protruding seal while maintaining the functional joining of the gussets, thereby improving the external appearance of the packaging bag.
Solution Approach 2:
The side seal is repositioned from the overlapping region (two-dimensional plane intersection) to the end edge (one-dimensional boundary line) of the side portion gusset. This dimensional change allows the seal to be integrated into the gusset structure without protruding outward, improving appearance while maintaining joining functionality.
Data Source
AI summary
A rectangular-bottomed packaging bag (1) is a rectangular-bottomed packaging bag formed by folding a sheet material member and includes a rectangular shaped bottom (2) a front (3) and a rear (4) rising from two facing sides of the bottom (2), and a pair of sides (5) connecting the front (3) and the rear (4). The pair of sides (5) each include a first region (31) positioned on the front (3) side, a second region (32) positioned on the rear (4) side, a side joining portion (33) joining the first region (31) and the second region (32), and an inclined joining portion (34) inclined to the bottom (2) side from the side joining portion (33) toward one of the front (3) and the rear (4) and joining the sheet material member of the first region (31) and the second region (32) overlapping each other in a direction of thickness.