Crystallized Inner Body Preform for Unobstructed Air Passage
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Solution Overview
Problem
In containers with separable laminated layers manufactured by stretch blow molding, the ambient air introduction hole can be blocked by the inner preform expanding radially outward, obstructing the air passage between the outer and inner layer bodies during the blow molding process.
Innovation Solution
A synthetic resin preform with a crystallized region in the inner body, having a higher degree of crystallization, is used, where the crystallized region is positioned between the ambient air introduction hole and the neck ring, and airflow ribs are formed to ensure an unobstructed air passage, preventing radial expansion during stretch blow molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the inner preform is allowed to expand radially outward during stretch blow molding, then the container structure can be formed, but the air passage leading from the ambient air introduction hole to the trunk becomes blocked
Solution Approach 1:
The inner preform is designed with a crystallized region having a higher degree of crystallization than other regions. This localized change in material properties creates a rigid portion that resists radial expansion during blow molding, while allowing other parts of the preform to expand and form the container structure. The crystallized region is positioned to specifically maintain the air passage opening without preventing overall container formation.
2Reliability
If the inner body is made completely rigid to prevent radial expansion, then the air passage remains open, but the container cannot undergo volume reduction and deformation for dispensing
Solution Approach 1:
The inner body is designed with heterogeneous properties: a crystallized region with high rigidity to maintain the air passage, and non-crystallized or less crystallized regions that remain flexible for volume reduction. This local differentiation allows the container to simultaneously achieve air passage preservation and dispensing functionality through controlled expansion and contraction of the flexible regions.
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 configuration maintains an unobstructed air passage from the ambient air introduction hole to the trunk, ensuring effective air flow and preventing the inner layer body from blocking the air passage, thus preserving the integrity of the air passage and the container's functionality.
Implementation Method 1
the inner body is made of a crystalline resin, and a crystallized region is formed in part of the inner body, the crystallized region having a higher degree of crystallization than other regions
Data Source
AI summary
A preform, a synthetic resin container, and a method for manufacturing a synthetic resin container in which an air passage leading from an ambient air introduction hole to a trunk can be easily preserved. In the mouth, the inner body includes a large-diameter portion provided at an upper end thereof, and a small-diameter portion continuously extending below the large-diameter portion via a connecting portion. In the mouth, the outer body is provided with an ambient air introduction hole passing through the outer body, and a neck ring positioned within a height range of the small-diameter portion. The inner body is made of a crystalline resin, and a crystallized region is formed in part of the inner body, the crystallized region having a higher degree of crystallization than other regions.