Synthetic Resin Container Corner Wall U-Shaped Ribs
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Solution Overview
Problem
Synthetic resin containers face challenges in formability and corner wall deformation, particularly when annular grooves are provided adjacent to reduced pressure absorption panels, leading to poor resin distribution and sink marks during molding.
Innovation Solution
The container features U-shaped ribs on corner walls with longitudinal and horizontal grooves, and side walls with a narrower width, which enhance rigidity and prevent deformation while improving formability by facilitating resin filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If annular grooves are provided adjacent to reduced pressure absorption panels to increase corner wall rigidity, then corner wall deformation is prevented, but resin distribution deteriorates and sink marks occur during molding
Solution Approach 1:
The patent applies local quality by providing U-shaped ribs only at the corner walls where rigidity is needed, rather than uniformly across the entire container. The ribs are specifically positioned to reinforce corner regions without interfering with the reduced pressure absorption panels on the main walls, thus locally enhancing strength while preserving overall formability.
Solution Approach 2:
The corner wall reinforcement is segmented into discrete U-shaped ribs rather than using continuous annular grooves. This segmentation allows the ribs to be strategically placed to provide rigidity where needed while leaving sufficient space for resin flow and avoiding the creation of narrow protrusions that would cause poor formability.
2Stability of the object's composition
If U-shaped ribs are formed on corner walls to prevent deformation, then corner wall stability is improved, but resin filling becomes difficult in narrow protrusion areas
Solution Approach 1:
The U-shaped ribs are designed with a specific geometry where the rib depth and width are optimized to provide sufficient corner wall stability without creating excessively narrow protrusions. The ribs extend partway into the corner wall thickness, providing reinforcement while maintaining adequate resin flow paths during molding.
Data Source
AI summary
A synthetic resin container has improved formability while preventing deformation of corner walls. The synthetic resin container includes a mouth that serves as a dispensing opening for contents, a body that is continuous with the mouth via a shoulder, and a bottom that closes a lower end of the body. The body includes a pair of main walls arranged so as to face each other with a gap therebetween, a pair of side walls arranged so as to face each other with a gap therebetween, and corner walls that couple respective ends in a circumferential direction of the main walls and the side walls. Each corner wall is provided with U-shaped ribs that are formed in a substantially U-shape within a surface of the corner wall and that are concave toward an inner side in a thickness direction of the corner wall.