Inverted Folded Bottom Wall for Synthetic Resin Container
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Solution Overview
Problem
Existing synthetic resin containers formed by blow molding often have a central region that rises, leading to liquid remaining in the annular recessed region, making it difficult to discharge the contents efficiently, especially when using a pump with a vertically installed sucking pipe.
Innovation Solution
A synthetic resin container with an inverted and folded back bottom wall, featuring a bending groove and annular rib configuration, which allows for a self-standing position and efficient liquid discharge without the need for inclining the container, while maintaining productivity and low cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the container is formed by blow molding with a raised central region at the bottom, then productivity and cost are reduced, but liquid remains in the annular recessed region making discharge incomplete
Solution Approach 1:
The bottom wall is inverted and folded back toward the inside of the body portion, transforming the conventional raised central region into a recessed annular region. This inversion eliminates the dead zone where liquid accumulated, allowing complete discharge while maintaining blow molding productivity
Solution Approach 2:
The bottom wall is folded back in a different spatial dimension to create a three-dimensional structure with an inverted geometry. This dimensional transformation converts the problematic flat raised region into a folded structure that directs liquid flow toward the discharge point
2Length of moving object
If the sucking pipe is positioned at the periphery of the bottom portion, then the opening can reach the bottom, but liquid remains in the recessed region due to pipe angle or diameter constraints
Solution Approach 1:
By inverting the bottom wall geometry, the recessed annular region is positioned such that liquid naturally flows toward the central discharge point. The sucking pipe can be positioned vertically at the center and still reach the lowest liquid level, eliminating the need for curved peripheral positioning
3Reliability
If injection molding is used to create complicated bottom shapes, then remaining liquid can be eliminated, but cost increases and productivity decreases
Solution Approach 1:
The invention achieves complete discharge by inverting the bottom wall during blow molding, creating a recessed annular region that directs liquid flow. This approach maintains blow molding productivity while eliminating the need for complex injection molding processes
Solution Approach 2:
The inverted bottom wall geometry is formed during the initial molding process, preliminarily creating the optimal liquid flow path. This preliminary structural preparation ensures complete discharge without requiring additional complex molding steps
Data Source
AI summary
Disclosed is a synthetic resin container provided with an inverting, foldback bottom wall that can maintain a stable, self-supporting position while being able to minimize the amount of residual contents, and that can be formed by blow-molding, etc., and maintain the favorable producibility or low cost of the past. The synthetic resin container is provided with a bottom wall that forms the bottom of the container, and a drum section that is united to the perimeter of the bottom wall and forms a filling space M for contents on the inside, and is a synthetic resin container wherein a raised bottom is formed by inverting and folding back said bottom wall toward said drum section. Said drum section has a lower peripheral wall that touches or approaches the outer wall part of said bottom wall and forms a self-supporting base by the inversion and folding back of said bottom wall.