Synthetic Resin Container Shoulder Impact Resistance
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Solution Overview
Problem
Synthetic resin containers experience poor impact resistance in the shoulder part when subjected to horizontal impacts, leading to deformation, which is not adequately addressed by existing designs with curved wall surfaces.
Innovation Solution
The container design incorporates a hem part curved in a convex arcuate shape and radially extending groove parts in the shoulder area, enhancing impact resistance by distributing horizontal forces and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the container wall is made thinner to reduce weight and cost, then the amount of resin used is reduced, but the rigidity of the container is reduced and the container is easily depressed by impact
Solution Approach 1:
The shoulder part is segmented into multiple curved surface portions (first, second, third curved surfaces) with different orientations. This segmentation allows the impact force to be distributed across multiple surfaces rather than concentrated on a single flat surface, maintaining strength while using thinner walls.
Solution Approach 2:
The shoulder part is designed with multiple curved surfaces instead of flat surfaces. The first curved surface has a tangent forming an acute angle with the horizontal plane, the second curved surface has a tangent forming an obtuse angle, and the third curved surface is substantially horizontal. These curvatures help distribute impact forces and prevent localized deformation, enabling thinner walls while maintaining rigidity.
2Strength
If the wall surface is formed of multiple curved surfaces to maintain strength, then the shoulder part strength is improved, but sufficient impact resistance to horizontal impact is not obtained
Solution Approach 1:
Different portions of the shoulder part are given different local geometries optimized for their specific functions. The first curved surface portion is optimized for longitudinal strength, the second curved surface portion for distributing horizontal impact, and the third curved surface portion for additional impact distribution. This local differentiation allows each portion to address specific mechanical requirements.
Solution Approach 2:
The design transitions from a two-dimensional view of the shoulder part to a three-dimensional multi-surface structure. By adding the third curved surface portion that is substantially horizontal and extending in the horizontal direction, the design utilizes additional spatial dimensions to intercept and distribute horizontal impact forces before they can deform the container.
3Productivity
If the container is conveyed with forward-tilting posture on a guide rail, then the container can be conveyed efficiently, but the container collides with previously conveyed containers and stops, applying horizontal impact to the shoulder part
Solution Approach 1:
The multi-curved surface shoulder part design acts as a pre-designed cushioning structure that anticipates horizontal impact forces during conveyance. The curved surfaces are geometrically configured to absorb and redirect impact energy from container collisions, protecting the container body from deformation during efficient forward-tilting conveyance operations.
Data Source
AI summary
A container (1) including an opening part (2), a shoulder part (3), a barrel part (4), and a bottom part (5), wherein: the shoulder part (3) includes a hem part (30) in which the longitudinal section is curved in a convex arcuate shape toward the outside of the container and which is connected to the barrel part (4); and a plurality of groove parts (31) extending radially from the container-center side toward the outer-peripheral-edge side are formed in the shoulder part (3) so as to extend at least to a position that reaches an upper end edge (UE30) of the hem part (30).