Movable Bottom Mold for Radial Structure Formation
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Solution Overview
Problem
Conventional container manufacturing methods, such as extrusion blow molding, result in inferior aesthetic appearance and dimensional accuracy compared to stretch blow molding, and struggle with forming solid structures protruding radially on the bottom surface, leading to increased material wastage and processing challenges.
Innovation Solution
A container mold with a split mold and a movable bottom mold that allows for the formation of radial structures by stretching a preform with a stretching rod and introducing pressurized fluid, enabling the formation of structures on the container's bottom surface through precise mold closure and compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extrusion blow molding method is used, then productivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The mold is divided into two independent parts: a split mold for the body portion and a separate bottom mold for the bottom surface. This segmentation allows each mold part to be optimized independently - the split mold can be designed for high-speed production while the bottom mold ensures precise formation of radial structures, thereby resolving the contradiction between productivity and manufacturing precision.
2Productivity
If extrusion blow molding method is used, then productivity is improved, but loss of substance worsens
Solution Approach 1:
The bottom mold is designed with a bottom mold reception portion that pre-defines the space for radial structures before the blow molding process begins. This preliminary action allows the resin to be precisely positioned and shaped during molding, eliminating the need for post-molding trimming and reducing resin wastage while maintaining high productivity.
3Manufacturing precision
If stretch blow molding method is used, then manufacturing precision is improved, but ease of manufacture worsens
Solution Approach 1:
The bottom mold is designed to be movable relative to the split mold, allowing it to move forward to close the mold space and form radial structures, then move backward to release the molded container. This dynamic design enables the complex formation of radial structures on the bottom surface while maintaining the ease of manufacture and container release, resolving the contradiction between manufacturing precision and ease of manufacture.
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 method enhances the aesthetic and dimensional quality of containers while reducing material wastage by allowing for the efficient formation of radial structures on the bottom surface, improving the manufacturing process for containers with complex shapes.
Implementation Method 1
a preform having a bottomed shape and made of heated resin
Implementation Method 2
stretching the preform with a stretching rod
Implementation Method 3
introducing a pressurized fluid into the preform and blow-molding a container to expand to the bottom mold reception portion
Implementation Method 4
closing the bottom mold and compressing a portion of the expanded container with the bottom mold reception portion and the bottom mold surface to form the structure on the container
Data Source
AI summary
A container mold includes: a split mold that has a mold space defining a shape of a body portion of a container; and a bottom mold that has a bottom mold surface defining a shape of a bottom surface of the container and is movable forward and backward with respect to the split mold. The split mold includes a bottom mold reception portion that is communicated with a bottom portion side of the mold space and receives the bottom mold. When the bottom mold is closed with respect to the split mold, a space between a surface of the bottom mold reception portion facing the bottom mold surface and the bottom mold surface is a space that defines a shape of a structure protruding in a radial direction of the container.