Movable Push Rod for Blow Molded Container Base
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Solution Overview
Problem
Existing blow molding techniques face challenges in accurately orienting plastic material around deep protrusions, such as 'push-ups' at the base of containers, leading to issues like inadequate material flow and physical properties.
Innovation Solution
A movable push rod mechanism within the blow mold, activated by an air cylinder or cam system, repositions a portion of the container base from an outward to an inward protruding position, ensuring proper material orientation and flow during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional blow molding techniques are used to form deep protrusions at the container base, then the container structure can be formed, but the plastic material orientation around the deep protrusion is inadequate
Solution Approach 1:
The base mold portion is made movable rather than fixed, allowing it to be repositioned to different locations within the mold cavity. This dynamic adjustment enables the base mold to guide plastic material flow effectively around deep protrusions during the blow molding process, improving material orientation without requiring complex fixed mold structures
Solution Approach 2:
The base mold portion is positioned in advance at a specific location within the mold cavity before the blow molding process begins. This preliminary positioning allows the plastic material to flow and orient properly around the deep protrusion from the start of molding, rather than requiring post-processing adjustments
2Strength
If conventional blow molding techniques are used to form deep protrusions, then the container can be manufactured, but the physical properties of the container are compromised
Solution Approach 1:
The base mold portion is designed with specific local geometry to match and guide material flow around the deep protrusion area. This localized mold design ensures proper material distribution and orientation specifically at the critical base region, enhancing container strength where it is most needed
Solution Approach 2:
The movable base mold portion allows for dynamic adjustment of the molding process to optimize material flow patterns, resulting in better material orientation and enhanced physical properties at the container base without complicating the overall manufacturing process
3Manufacturing precision
If a movable base mold portion is used to improve material orientation, then manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The mold is divided into separate portions, with the base mold portion being distinct from the main mold body. This segmentation allows the base portion to be independently positioned and moved to optimize material flow, improving manufacturing precision while keeping the overall mold structure manageable through modular design
Data Source
AI summary
The present invention relates to a base assembly (100) for forming a base portion of a plastic container. The base assembly comprises a base pedestal (104), a base mold attached to the base pedestal, a push rod (102) movable between a first position and a second position with respect to the base mold to reposition a portion of the plastic container, and an activation mechanism adapted to move the push rod between the first position and the second position.