Container Manufacturing with Variable-Parison Inner-Surface Profiles
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Solution Overview
Problem
Conventional direct blow molding apparatuses cannot produce containers with unevenness on the inner surface or different thicknesses in the height direction, limiting design flexibility and functionality.
Innovation Solution
A method and apparatus that involve moving the core or die up and down to extrude parisons with varying thicknesses, forming unevenness on the inner surface by altering the clearance between the core and die, and expanding the parison within a mold to create containers with continuous or selective unevenness and thickness variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional direct blow molding apparatus is used to manufacture containers, then uniform thickness containers can be produced, but containers with unevenness on the inner surface or different thickness in the height direction cannot be manufactured
Solution Approach 1:
The core or die is made movable in the vertical direction during parison extrusion, allowing dynamic adjustment of the clearance between the core and die. This dynamic adjustment enables continuous variation of parison thickness in the height direction, creating unevenness on the inner surface of the container while maintaining the ability to produce uniform thickness containers when the core/die remains stationary
Solution Approach 2:
The clearance parameter between the core and die is changed during the extrusion process by moving the core or die vertically. This parameter change directly controls the parison thickness distribution, enabling the production of containers with different inner surface profiles (uniform or uneven) and thickness variations in the height direction from the same molding apparatus
2Shape
If the core or die moves up and down to continuously extrude parisons with different thicknesses, then unevenness is formed on the inner surface of the container, but the manufacturing process becomes more complex
Solution Approach 1:
The apparatus incorporates a simple vertical movement mechanism for the core or die, adding minimal structural complexity. The movement can be controlled to create various unevenness patterns on the inner surface by adjusting the amplitude and frequency of the core/die oscillation, providing design flexibility without significant increase in device complexity
Solution Approach 2:
The movable core or die mechanism serves multiple functions: it can remain stationary to produce uniform thickness containers, move with small amplitude to create subtle unevenness, or move with large amplitude to create pronounced thickness variations. This single mechanism provides versatile container design options without requiring multiple specialized apparatuses
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
Enables the production of containers with smooth, continuous unevenness and thickness variations on the inner surface, enhancing design flexibility and functionality, such as improved appearance and ease of labeling, while maintaining a flat outer surface.
Implementation Method 1
when a resin forming the parison is extruded from a die, a core or the die moves up and down to continuously extrude parisons having different thicknesses
Implementation Method 2
expanding the parison from the inner side by air or the like in a state where the parison is sandwiched by the mold
Data Source
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AI summary
A container having unevenness on an inner surface is manufactured. A container manufacturing method including step A of forming a tube-shaped parison, step B of sandwiching the parison with a mold, and step C of expanding the parison from an inner side to form a container, in which in the step A, when a resin forming the parison is extruded from a die, a core or the die moves up and down to continuously extrude parisons having different thicknesses, and unevenness is formed on an inner surface of the formed container.