Rotatable Bottom Mold for Large-Angle Resin Container Blow Molding
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Solution Overview
Problem
Existing blow molding methods struggle to manufacture containers with large inclination angles in their necks using stretch blow molding, as conventional techniques are limited to small angles, and direct blow molding results in inferior aesthetic appearance and other manufacturing issues.
Innovation Solution
A blow molding mold equipped with a holding mechanism and rotation mechanism that allows independent gripping and rotation of a preform's protruding portion, enabling the production of containers with large inclination angles through stretch blow molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If direct blow molding is used to manufacture containers with large inclination angles, then the inclination angle can be achieved, but the aesthetic appearance and manufacturing quality deteriorate
Solution Approach 1:
The invention introduces a rotation mechanism that enables the bottom mold to rotate dynamically during the blow molding process. This allows the preform to be rotated to the desired inclination angle position before and during blowing, enabling large inclination angles (60° or larger) to be achieved while maintaining manufacturing precision and aesthetic appearance through controlled dynamic positioning rather than static molding
Solution Approach 2:
The holding mechanism independently provided to the bottom mold grips the protruding portion of the preform before the blowing process begins. This preliminary gripping action secures the preform in position, allowing subsequent rotation to the target inclination angle to be performed accurately before the actual blow molding occurs, ensuring both large inclination angles and high manufacturing quality
2Manufacturing precision
If conventional stretch blow molding with inclination stretch mechanism is used, then small inclination angles can be manufactured, but large inclination angles (60° or larger) become substantially impossible
Solution Approach 1:
The rotation mechanism transforms the conventional static bottom mold into a dynamically rotatable component. By rotating the bottom mold to the desired inclination angle position before and during the blow molding process, the invention enables achievement of large inclination angles (60° or larger) that were previously impossible with conventional stretch blow molding, while maintaining aesthetic appearance through controlled positioning
3Shape
If independent holding mechanism is added to bottom mold, then large inclination angles can be achieved by stretch blow molding, but device complexity increases
Solution Approach 1:
The invention segments the mold system into independently controllable components: a bottom mold with independent holding mechanism and rotation capability, and a neck mold that remains stationary. This segmentation allows the bottom mold to perform both holding and rotation functions independently, enabling large inclination angles while keeping the overall device complexity manageable through modular functional separation
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 mold and method enable the production of containers with large inclination angles, achieving superior aesthetic appearance and avoiding the drawbacks of direct blow molding, such as poor welding and reduced dimensional accuracy.
Implementation Method 1
stretching the preform by a pressurizing medium
Data Source
AI summary
A blow molding mold in which a holding mechanism is independently provided to a bottom mold and is configured to be capable of gripping a protruding portion provided to a bottom portion of a preform independently of a gate portion, and a rotation mechanism is configured to be capable of rotating the bottom mold, relative to a neck portion of the preform which is in a stationary state held by neck molds, in a state where the protruding portion is gripped by the holding mechanism.