Variable Depth Grooves for Synthetic Resin Containers
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Solution Overview
Problem
Conventional synthetic resin containers with reduced pressure absorbing panels formed as grooves extending in the vertical direction and twisting in the circumferential direction about the central axis of the trunk face issues during blow molding, where the degree of undercut relative to the mold can lead to scratches on the outer circumferential surface when the mold is opened, while shallower panels reduce the amount of pressure absorption.
Innovation Solution
The synthetic resin container features reduced pressure absorbing panels with varying depths, where the upper and lower parts are shallower than the central part, allowing the parting line to pass through specific sections, reducing the degree of undercut and maintaining effective pressure absorption without scratching the outer surface during mold opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reduced pressure absorbing panels are formed deeper to increase pressure absorption capacity, then the amount of reduced pressure absorbed is improved, but the degree of undercut increases causing scratches on the outer circumferential surface during mold opening
Solution Approach 1:
The reduced pressure absorbing panels are designed with non-uniform depth, being deeper at the central part and shallower at the upper and lower parts. This local variation in depth allows the panels to provide sufficient pressure absorption capacity at the center while reducing the degree of undercut at the edges that would otherwise cause scratches during mold opening
Solution Approach 2:
The reduced pressure absorbing panels are segmented into different depth zones (deeper central part and shallower upper/lower parts), allowing each zone to serve different functions - the central part absorbs pressure while the edge parts minimize contact interference with the mold during opening
2Object-affected harmful factors
If the reduced pressure absorbing panels are formed shallower to reduce the degree of undercut and prevent scratches, then the surface quality is improved, but the amount of reduced pressure absorbed is reduced
Solution Approach 1:
Instead of uniformly shallowing the panels, the invention applies local quality by making the central part deeper for pressure absorption while the upper and lower parts are shallower to reduce undercut, achieving both surface quality and pressure absorption requirements
3Reliability
If the reduced pressure absorbing panels are formed as grooves extending in the vertical direction and twisting in the circumferential direction, then the pressure absorption efficiency is improved, but the degree of undercut relative to the mold increases causing scratches during mold opening
Solution Approach 1:
The twisting groove structure is maintained for pressure absorption efficiency, but with local depth modification - deeper in the central part and shallower at the edges - to reduce the degree of undercut that causes manufacturing difficulties during mold opening
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration prevents scratches on the outer circumferential surface of the trunk during mold opening while ensuring adequate reduced pressure absorption, maintaining the container's appearance and shape.
Implementation Method 1
as the content medium is cooled, the inside of the container is placed under reduced pressure, possibly causing the trunk to be deformed significantly. To address the above problem, the trunk may be provided with the reduced pressure absorbing panels, so that the reduced pressure inside the container may be absorbed through deformation of the reduced pressure absorbing panels
Data Source
AI summary
A synthetic resin container, the container including: a parting line; and a plurality of reduced pressure absorbing panels each formed as a groove extending in the vertical direction while twisting in the circumferential direction, the reduced pressure absorbing panels being disposed in the trunk, in which: when the parting line passes through an upper part of a first reduced pressure absorbing panel and through a lower part of a second reduced pressure absorbing panel, the first reduced pressure absorbing panel is shallower in depth at the upper part thereof than at a central part thereof in the vertical direction, and the second reduced pressure absorbing panel is shallower in depth at the lower part thereof than at a central part thereof in the vertical direction.