Double Container Air Intake via Threaded Cap Tension
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional double container assemblies with a rigid outer and flexible inner container face challenges in forming an external air introducing opening efficiently and reliably, particularly during mass production, due to variations in blow pressure and temperature affecting the position and thickness of the inner layer, leading to difficulties in cutting or exposing the inner layer without damaging it.
Innovation Solution
A method using a split mold to mold a double container assembly with a threaded cap, where a large-outer-diameter region and a small-outer-diameter region are formed, and clearance-caused burrs are removed to create slits in the outer layer, allowing external air to enter the space between the layers, with the threaded cap applying tension to open the slits and facilitate air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional molding methods are used to form the outer and inner layers, then the container can be manufactured, but the position and thickness of the inner layer vary due to blow pressure and temperature variations, making it difficult to reliably form the air introducing opening
Solution Approach 1:
The patent forms protrusions on the inner layer during the initial molding process, before the air introducing opening needs to be created. These protrusions are positioned at predetermined locations and serve as guides for subsequent cutting or opening operations, ensuring consistent and reliable opening formation despite variations in blow pressure and temperature
Solution Approach 2:
The protrusions on the inner layer act as intermediary elements that facilitate the formation of the air introducing opening. By providing these predetermined structural features, the patent enables reliable opening formation without directly controlling the variable blow pressure and temperature parameters
2Ease of manufacture
If the inner layer is cut or exposed to form the air introducing opening, then external air can be introduced, but the inner layer may be damaged during the cutting process
Solution Approach 1:
The protrusions are formed in advance during molding, providing predetermined locations for opening formation. This preliminary structuring enables simple cutting or exposing operations while maintaining inner layer integrity, as the cuts are made along predetermined paths guided by the protrusions
Solution Approach 2:
The air introducing opening is formed by creating slits or separations at specific locations where protrusions exist. This segmentation approach allows controlled opening formation that introduces air while preserving the overall integrity of the inner layer structure
3Reliability
If a complex apparatus or process is used to form the air introducing opening, then the opening can be reliably formed, but the processing cost and complexity increase
Solution Approach 1:
The air introducing opening formation is integrated into the initial molding process by forming protrusions during container manufacturing. This eliminates the need for separate, complex apparatus for opening formation, achieving reliable opening creation through simple subsequent operations on predetermined structures
Solution Approach 2:
The formation of the air introducing opening is combined with the initial container molding process. The protrusions are created during the same molding operation that forms the container body, merging multiple functions into a single process and reducing overall complexity
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 enables easy and reliable formation of an external air introducing opening in the double container assembly at a lower processing cost, allowing for mass production without damaging the inner layer, thus preventing oxidation of the remaining content.
Implementation Method 1
a threaded cap, and wherein the threaded cap, when threadingly engaged with the cap-receiving threaded portion, applies a tension to the small-outer-diameter region from which the clearance-caused burr has been removed, in a direction causing the cap-receiving threaded portion and the large-outer-diameter region to be pulled away from each other
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
Provided are a double container assembly comprising: a double container comprised of a relatively-rigid outer container and a flexible inner container disposed inside the outer container and capacity-variable in response to an amount of a content thereof, and capable of being easily produced using a molding apparatus which is not largely different from a conventional type; and a threaded cap, and a manufacturing method for the double container assembly, wherein the double container assembly and the manufacturing method can form an external air introducing opening in the double container significantly easily and reliably at a lower processing cost than that in conventional techniques. During the course of moving a pair of partial molds to come close to each other so as to combine them together to make up a split mold, a portion of a parison corresponding to a small-outer-diameter region of a double container is clamped by at least respective parts of mating surfaces of the pair of partial molds, to thereby form a protruding tub piece. Then, the protruding tub piece is cut off to form a space between the outer and inner containers of the double container, and an opening area of the space is sufficiently expanded through an operation of threadingly engaging the cap with the double container.