Flat-bottomed Plastics Container with Curved Bottom Design
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Solution Overview
Problem
Flat containers with oval bottoms often suffer from instability due to uneven distribution of plastics material during blow-molding, leading to molding defects and structural weaknesses.
Innovation Solution
A container design featuring a bottom with an oblong curved contour, including a seating surface with width reductions and arched areas with indentations and curved portions, which allows for proper distribution and molding of plastics material without the need for a boxing insert.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If blow-molding is used to manufacture flat containers with oval bottoms, then production efficiency is improved, but uneven distribution of plastics material occurs leading to instability
Solution Approach 1:
The patent applies local quality by creating specific geometric features (width reductions and arched areas) at particular locations on the container bottom. These localized structural modifications ensure that plastics material is properly distributed to lateral edges during blow-molding, addressing the uneven material distribution problem while maintaining overall production efficiency through a standardized molding process.
Solution Approach 2:
The patent utilizes curvature by designing arched areas with specific radii (0.05w to 0.15w) and curved contours in the bottom structure. These curved geometric features guide the flow and distribution of plastics material during the blow-molding process, preventing material accumulation defects and ensuring stable material distribution to achieve container stability while maintaining high productivity.
2Manufacturing precision
If a boxing insert is used to achieve a continuous standing plane, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts the boxing insert from the molding process entirely. Instead of using a separate movable boxing insert to deform the bottom and achieve a continuous standing plane, the invention integrates the standing plane formation directly into the mold bottom geometry itself, simplifying the device while maintaining manufacturing precision.
Solution Approach 2:
The patent merges the function of the boxing insert with the mold bottom structure. The mold bottom is designed with integrated geometric features (width reductions and arched areas) that simultaneously form the container bottom shape and create the continuous standing plane, eliminating the need for a separate boxing insert and reducing device complexity.
3Ease of operation
If the bottom is made flat to achieve continuous standing plane, then ease of operation is improved, but plastics material distribution becomes uneven
Solution Approach 1:
The patent segments the bottom structure into distinct functional zones: a flat seating surface area providing the continuous standing plane, and transitional arched areas with specific curvature radii that guide material flow. This segmentation allows the flat seating surface to provide ease of operation while the arched transition zones ensure uniform plastics material distribution during molding.
Solution Approach 2:
The patent incorporates preliminary action by pre-designing the mold bottom geometry with width reductions and arched areas that proactively guide plastics material distribution during the molding process. This preliminary geometric configuration ensures uniform material distribution before the actual molding occurs, preventing defects while maintaining the flat seating surface for ease of operation.
Data Source
AI summary
Described is a container made of plastics material, provided with a body and with a bottom in the continuation of the body at a lower end of the body. The bottom has an oblong curved contour and includes a seating surface forming a standing plane of the container. The standing plane has an oblong closed curved shape extending along a longitudinal median axis and a transverse median axis. The standing plane also has an arched area extending from the seating surface as far as a central zone of the bottom, the arched area delimiting a concavity oriented toward the outside of the container.