Foldable Bag Reversed T-Shape Design for Leakage Prevention
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Solution Overview
Problem
Existing foldable bags face challenges in efficient filling due to stress concentrations in welding seams and instability during filling, particularly when inwardly creased bag portions are welded to the edges, leading to inefficient unfolding and potential leakage.
Innovation Solution
A foldable bag design featuring a reversed T-shape with inwardly creased side edges between the front and back sheets, allowing for efficient unfolding and stable placement, where the inner bottom edge extends within the plane of the upward portion, and outer edges are parallel, avoiding fixed creased portions that cause stress concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inwardly creased bag portions are welded to the edges, then the bag structure is strengthened, but stress concentrations occur leading to potential leakage
Solution Approach 1:
The patent removes the inwardly creased bag portions from the design, extracting the problematic welded connections that caused stress concentrations. By eliminating these creased portions and their welds, the source of stress concentration is removed while maintaining bag integrity through alternative structural means.
Solution Approach 2:
Instead of welding inwardly creased portions to strengthen the bag, the invention inverts the approach by avoiding welds at creased areas entirely. The design accepts that welds at creased portions create stress concentrations, so it reverses the conventional approach by not welding at these locations, thereby preventing leakage while maintaining strength through other means.
2Ease of manufacture
If the bag is designed with a conventional shape, then manufacturing is simpler, but efficient unfolding during filling is compromised
Solution Approach 1:
The bag is pre-formed with specific fold lines and creases during manufacturing that are designed to automatically unfold in a controlled sequence during filling. This preliminary structuring of the folded bag ensures that when filling begins, the bag unfolds efficiently without requiring complex manual intervention or specialized filling equipment.
Solution Approach 2:
The bag design incorporates dynamic unfolding characteristics where the fold lines and creases are arranged to allow the bag to progressively open as fluid enters. The structure transitions from a compact folded state to an expanded filling state through controlled deformation along predetermined lines, optimizing the unfolding process during filling operations.
3Volume of moving object
If inwardly creased portions are used, then the bag can be compactly folded, but instability occurs during filling
Solution Approach 1:
The invention extracts the inwardly creased portions that caused instability during filling while retaining the ability to achieve compact folding through alternative fold line configurations. By removing the problematic creased portions and replacing them with a design where fold lines extend to the edges without creating inward creases, the bag maintains compactness while achieving filling stability.
Data Source
AI summary
A foldable bag comprises a front sheet and a back sheet which are circumferentially joined to each other. The bag is disposed in a folded condition in which the bag has a reversed T-shape including a bottom and an upward portion extending upwardly from the bottom. In the folded condition of the bag, upward portion side edges are inwardly creased between the front sheet and the back sheet such that they face to each other. At the bottom, an inner bottom edge portion extends substantially within a plane of the upward portion and each of outer bottom edge portions extend substantially parallel above the inner bottom edge portion.