Blow Mold Retractable Base for Recessed Container Formation
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Solution Overview
Problem
Traditional blow molding techniques struggle to create containers with recessed bases due to difficulties in forming sharp corners and managing mechanical stress, leading to malformation and instability during the manufacturing process.
Innovation Solution
A three-part blow mold with a retractable push-up portion in the base allows for the formation of containers with recessed bases by providing additional mechanical manipulation and controlled release, reducing mechanical stress and enabling the creation of deeper recesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional blow molding techniques are used to form containers with recessed bases, then the manufacturing process is simple, but the containers are prone to malformation and disfigurement due to high mechanical stress
Solution Approach 1:
The mold base is segmented into a fixed portion and a retractable push-up portion that can move independently. This segmentation allows the push-up portion to protrude during blow molding to provide internal support, then retract before ejection to prevent malformation, thereby improving container base formation quality without requiring complete mold redesign
Solution Approach 2:
The push-up portion is designed to be dynamically movable between a retracted position and a protruded position. During blow molding, it protrudes to provide internal support against high mechanical stress; before ejection, it retracts to eliminate interference with container removal. This dynamic adjustment improves manufacturing precision while managing device complexity through controlled movement
2Stability of the object's composition
If the base is made rigid to support stacked containers, then stacking stability improves, but the container cannot accommodate deeply indented bases required for vertical stacking
Solution Approach 1:
The recessed base shape is pre-formed during the blow molding process using the retractable push-up portion. The push-up portion protrudes into the mold cavity during molding to create the desired indentation depth, then retracts before ejection. This preliminary formation ensures the container has the proper geometry for vertical stacking while maintaining structural integrity for stacking stability
3Shape
If the push-up portion protrudes deep into the mold cavity to create deep recesses, then deeper base indentations are achieved, but mechanical stress on the container increases causing malformation
Solution Approach 1:
The push-up portion rapidly protrudes into the mold cavity during the brief blow molding window when the container wall is still pliable, creating the deep recess quickly before the material cools and stiffens. This rapid action allows deep indentation formation without prolonged exposure to high mechanical stress that would cause malformation, thereby achieving both deep base recesses and maintaining container base integrity
Data Source
AI summary
Blow molding tools and a method of blow molding which provide that the tool have a retractable push up section in the base which allows for the article molded by the tool to have a recessed base internal to an otherwise hollow structure. As the push up is moveable, adjustment of the push up portion can be performed during an automated blow molding operation so as to allow release of the blow molded article.