Composite Preform Blow Molding for Multi-Functional Containers
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Solution Overview
Problem
Conventional biaxially oriented blow molding methods for plastic containers are limited in providing different functions and characteristics to various parts of the container, such as the trunk and bottom, as they primarily rely on changing the material composition of the preform, making it difficult to achieve specific properties like gas barrier, thermal insulation, or design features across different sections.
Innovation Solution
A blow molding method involving a composite preform where a plastic member with specific properties is integrated with the preform, allowing for the independent selection of materials and functions for different parts of the container, such as the trunk and bottom, through close contact and heating, enabling the formation of containers with enhanced gas barrier, thermal insulation, and design features without the need for new molding equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional biaxially oriented blow molding methods are used with single-layer or multilayer preforms, then the manufacturing process is simple and uses standard equipment, but the ability to provide different functions and characteristics to different parts of the container is limited
Solution Approach 1:
The container is divided into multiple functional zones (trunk part, bottom part, etc.) with different material compositions and properties. Each zone can have specific barrier properties, thermal insulation characteristics, or design features by selecting appropriate preform materials for each segment, enabling differentiated functionality without requiring complex multi-component molding systems.
Solution Approach 2:
Different regions of the container are assigned different material compositions and properties. The preform can incorporate localized functional characteristics such as enhanced gas barrier properties in specific areas, varying thermal insulation levels, or distinctive design features in different zones, achieving local optimization of performance characteristics.
2Adaptability or versatility
If only the preform material composition is changed to achieve different functions, then the manufacturing process remains simple, but it becomes difficult to give different functions and characteristics to different parts of the container
Solution Approach 1:
The preform is segmented into multiple zones with different material compositions during the molding process. Each zone can be formed with specific properties (barrier, insulation, design) by incorporating different materials into the preform structure before blowing, allowing function differentiation while maintaining a single integrated molding operation.
Solution Approach 2:
The preform is constructed as a composite structure containing different materials with specific properties in different zones. This allows the container to have varied functional characteristics (gas barrier, thermal insulation, design features) in different parts while being manufactured as a single integrated component using standard blow molding equipment.
3Adaptability or versatility
If a composite preform with multiple materials is used to provide different functions to different parts, then function differentiation is achieved, but the manufacturing precision and control of material distribution become more difficult
Solution Approach 1:
The different material zones are prepared and positioned in the preform before the blow molding process. The preform is pre-formed with the correct material distribution and geometry, so that when the blowing process occurs, the materials are already in their final positions and orientations, simplifying control and ensuring precision of material distribution in the finished container.
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 allows for the flexible assignment of various functions and characteristics to different parts of the container, enhancing its performance and functionality while maintaining manufacturing efficiency by using standard blow molding apparatuses.
Implementation Method 1
the plastic member is an outer contractive member having a function of contracting with respect to the preform. The making of the composite preform includes arranging the outer contractive member outside the preform and heating the preform and the outer contractive member.
Implementation Method 2
heating the composite preform and inserting the composite preform in a blow molding die
Implementation Method 3
integrally inflating the preform and the plastic member of the composite preform by performing blow molding on the composite preform in the blow molding die
Data Source
AI summary
A composite preform including a preform and a plastic member in close contact with the outer surface of the preform is made by preparing the preform made of plastic material and arranging the plastic member to surround the outer surface of the preform. Subsequently, the composite preform is heated and inserted in a blow molding die and undergoes blow molding in the blow molding die, by which the preform and the plastic member of the composite preform are inflated integrally and a composite container is obtained.