Synthetic Resin Bottle Bottom Plate Rib Design
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Solution Overview
Problem
Thin-walled synthetic resin bottles with upward-drawing bottom plates face issues with unsatisfactory vacuum absorption due to unintended foldlines developing at the boundaries of the ring groove and flat ring portion, leading to incomplete pressure restoration and potential fluid spillage.
Innovation Solution
A biaxially stretched, blow-molded synthetic resin bottle with a sunken bottom featuring a ring groove, central concave portion, and flat ring portion, where short slim ribs are radially disposed on the flat ring portion to promote smooth upward deformation and prevent foldline formation, ensuring effective vacuum absorption and complete pressure restoration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the bottle wall is made thinner to save resources and reduce cost, then resource efficiency and cost are improved, but the vacuum absorbing function deteriorates due to foldline formation that inhibits bottom deformation
Solution Approach 1:
The patent applies preliminary action by forming guide ribs on the bottom plate before the vacuum absorption process. These ribs pre-establish the deformation paths and stress distribution patterns that prevent foldline formation during subsequent pressure changes. The ribs are positioned to guide the bottom plate's upward deformation smoothly, ensuring reliable vacuum absorption even with thin walls.
Solution Approach 2:
The patent applies local quality by creating localized structural features (guide ribs) only in specific areas of the bottom plate where deformation occurs. The ribs are positioned radially from the center toward the periphery, providing localized reinforcement and guidance exactly where needed to prevent foldlines, while maintaining thin walls in other areas for resource efficiency.
2Reliability
If vacuum absorbing panels are added to the body wall to improve vacuum absorption, then the vacuum absorbing function is improved, but the bottle appearance and design are worsened due to visible deformations
Solution Approach 1:
The patent applies the taking out principle by extracting the vacuum absorption function from the visible body wall and relocating it to the bottom plate. The guide ribs and central concave portion on the bottom plate perform the vacuum absorption function, while the body wall remains smooth and aesthetically pleasing without visible deformation panels.
Solution Approach 2:
The patent applies dimensionality change by moving the vacuum absorption mechanism from the vertical dimension (body wall panels) to the horizontal dimension (bottom plate deformation). The bottom plate deforms upward in the radial direction from center to periphery, absorbing vacuum effects without affecting the vertical appearance of the bottle body.
3Stability of the object's composition
If the body wall is made thicker to improve shape retainability and prevent foldlines, then shape stability is improved, but resource consumption and cost are worsened
Solution Approach 1:
The patent applies local quality by providing structural reinforcement (guide ribs) only in the bottom plate area where deformation occurs during vacuum absorption. This localized reinforcement maintains shape stability and prevents foldlines without requiring thick walls throughout the entire bottle, thus reducing overall material consumption.
Solution Approach 2:
The guide ribs pre-establish the deformation pattern and stress distribution in the bottom plate, ensuring stable shape retention during vacuum absorption. This preliminary structural arrangement prevents unpredictable foldline formation without requiring excessive wall thickness.
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
The ribbed structure allows for smooth upward drawing deformation of the bottom plate, maintaining the bottle's shape and preventing foldlines, thus ensuring a satisfactory vacuum absorbing function and preventing fluid spillage when pressure is restored.
Implementation Method 1
when there is a decrease in the pressure inside the bottle
Implementation Method 2
the body is provided with the so-called vacuum absorbing panels, which are, by design, easily deformed into a dented state under a reduced pressure condition
Data Source
AI summary
A biaxially stretched, blow molded synthetic resin bottle has a bottom including a sunken bottom portion, and deforms as it draws upward in a direction of the bottle inside and includes a ring groove formed by being successively connected to an inner peripheral edge of a ground contact portion disposed at the foot of an outer peripheral wall of the bottom, a central concave portion disposed at a center of the bottom, and a flat ring portion disposed between an inner peripheral edge of the ring groove and the central concave portion, wherein the sunken bottom portion includes a plurality of short slim ribs disposed at several points of the flat ring portion.