Paper Inner Container Sealing via Valley-Folded Panel
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Solution Overview
Problem
The existing paper inner containers for refillable containers face issues with reliable sealing due to excessive pressure during thermal welding, leading to potential liquid leakage, and the manufacturing process is cumbersome due to the need for precise alignment of suction ports.
Innovation Solution
A paper inner container design featuring a top surface with a suction port and a top surface formation assisting panel that prevents overlap with the suction port, allowing for valley-folding and easier thermal welding, reducing the risk of resin tearing and eliminating the need for precise hole alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the sealing panel is pressed strongly against the upper top surface forming panel to improve heat transmission during thermal welding, then heat transmission is improved, but the thermoplastic resin at the fold-up portion is torn causing insufficient sealing
Solution Approach 1:
The sealing panel is divided into a mountain-folded portion and a valley-folded portion. The valley-folded portion is positioned to overlap with the upper top surface forming panel during sealing, creating a localized sealing area with better heat transmission. This segmentation allows different portions of the sealing panel to serve different functions: the mountain-folded portion provides structural support while the valley-folded portion ensures reliable sealing through improved thermal contact.
2Shape
If the lower top surface forming panel and side panels are folded to form the top surface, then the container structure is formed, but excessive pressure during sealing causes resin tearing
Solution Approach 1:
Instead of pressing the sealing panel against the folded panels from the outside, the sealing panel itself is folded (valley-folded) to create the overlapping structure. This inversion of the folding approach allows the sealing panel to conform to the folded panels while maintaining structural integrity and distributing pressure more evenly, preventing resin tearing.
3Ease of operation
If holes are formed in both top surface forming panels to serve as suction ports, then the suction function is achieved, but precise alignment is required making manufacture cumbersome
Solution Approach 1:
The suction port function is extracted from requiring holes in both top surface forming panels. Instead, only the lower top surface forming panel needs a hole, while the upper panel remains intact. The suction port is formed by the hole in the lower panel combined with the overlapping structure, eliminating the need for precise hole alignment between both panels and simplifying manufacturing.
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 design ensures reliable sealing without liquid leakage and simplifies the manufacturing process by reducing the complexity of sealing and aligning suction ports, while maintaining excellent heat transmission for effective thermal welding.
Implementation Method 1
the inner surface of the sealing panel and the inner surface of the top surface forming panel are bonded to each other to seal the paper inner container
Data Source
AI summary
A paper inner container for storage of a refilling liquid content, the paper inner container including a body (11), which includes a body front panel (7), a body right side panel (6), a body left side panel (8), and a body back panel (5). A top surface (12) includes: a top surface forming panel (14) which is continuously provided on an upper edge of the body back panel; a top surface formation assisting panel (16), which is continuously provided on an upper edge of the body front panel, and is folded up on a lower side of the top surface forming panel; and right and left side panels (19, 20), which are continuously provided on upper edges of the body right side panel and the body left side panel, and are folded up along with overlapping of the top surface forming panel and the top surface formation assisting panel.