Synthetic Resin Container Lid With Breakable Restraint Wall
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional synthetic resin container lids require significant force to remove and can become separated into scrap pieces upon removal, leading to inefficiency and waste.
Innovation Solution
A cap-type synthetic resin container lid design featuring thin-walled inversion pieces, a restraint wall with a breakable weakened section, and an operating section with locked projections and locking projections that collaborate to restrict expansion, allowing easy removal without separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the restraint wall is made rigid and connected firmly to the skirt wall, then the structural strength is improved, but the force required to remove the container lid increases significantly
Solution Approach 1:
The restraint wall is divided into multiple arc-shaped sections arranged circumferentially, with breakable connecting sections between them. This segmentation allows the restraint wall to maintain structural integrity through multiple segments while enabling easy removal when the connecting sections break, resolving the contradiction between strength and ease of removal.
Solution Approach 2:
The connecting sections between restraint wall segments are pre-designed with breakable features (reduced thickness or weakened structure). During normal use, these sections remain intact providing structural strength, but during removal they break automatically to reduce the force needed, implementing preliminary preparation for both states.
2Reliability
If the connecting section between the restraint wall and skirt wall is made strong, then the reliability is improved, but the restraint wall becomes separated and forms scrap pieces upon removal
Solution Approach 1:
The restraint wall is segmented into multiple arc-shaped sections that remain connected to the skirt wall through thin inversion pieces even after the main connecting sections break. This ensures the restraint wall components are not lost as scrap but remain attached to the main body in a controlled manner.
Solution Approach 2:
The thin inversion pieces act as intermediary elements that maintain the connection between the restraint wall segments and the skirt wall after the primary connecting sections break. This intermediary connection prevents the restraint wall from becoming completely separated and forming scrap pieces, while still allowing reliable sealing during normal use.
3Ease of operation
If the restraint wall is designed to expand freely during removal, then the ease of operation is improved, but the structural stability deteriorates
Solution Approach 1:
The restraint wall is divided into multiple arc-shaped sections that can expand independently during removal operations. This segmentation provides ease of operation as each section can move more freely, while the overall circular arrangement and connection points maintain structural stability during normal use.
Solution Approach 2:
Different parts of the restraint wall structure have different properties: the main body maintains rigidity for stability, while the connecting sections between segments are designed with reduced thickness or weakened structure to allow easier expansion during removal, creating local quality differences that resolve the contradiction.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A cap-type synthetic resin container lid (2), which can be removed sufficiently easily from a mouth-neck section (38) of a container without requiring great force and, even after removal from the mouth-neck section (38) of the container, continues to be kept integral without being partly separated to form a scrap piece, is provided. The container lid (2) includes thin-walled inversion pieces (18) arranged at intervals in the circumferential direction and extending upward beyond a top panel wall (4) from the lower ends of the thin-walled inversion pieces, the lower ends being connected to the outer peripheral surface of a skirt wall (6) or to the boundary part between the outer peripheral surface of the skirt wall (6) and the upper surface of the top panel wall (4); a restraint wall (20) connected to the upper ends of the thin-walled inversion pieces (18) and having a specific site (22) in the circumferential direction, the specific site being either split, or being defined by a breakable weakened section (24); and an operating section (30) connected to the outer peripheral surface of the skirt wall (6) via a connecting piece (28) extending out radially from the outer peripheral surface of the skirt wall (6) at a position in alignment with the specific site (22). Locked projections (26) and locking projections (36) are disposed in the restraint wall (20) and the connecting piece (28), respectively, to collaborate in restricting the expansion of the restraint wall (20).