Thermoplastic Container Vent Cannula for Residual Air Removal
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Solution Overview
Problem
Existing methods for producing thermoplastic containers, such as those used for pharmaceuticals, often leave significant residual air volumes when filled with liquids, which can affect the precise delivery of contents like anesthetics.
Innovation Solution
A method that involves forming a vent cannula in the container closure, allowing air to escape during the filling process, and then closing it to minimize residual air, with additional head jaws severing the cannula for easy removal, ensuring the container is nearly air-free.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the container is filled with liquid contents, then the container can be used for infusion purposes, but significant residual air volumes remain in the container
Solution Approach 1:
A vent cannula is formed in the container closure before filling, allowing air to escape during the filling process. This preliminary preparation enables complete emptying of the container later by eliminating the harmful residual air volume that would otherwise remain
Solution Approach 2:
The container closure is segmented to include a separate vent cannula component that can be formed, used for air evacuation, and then sealed off. This segmentation allows the closure to perform multiple functions: sealing the container and providing a controlled path for air removal
2Reliability
If the container closure is completely sealed, then the container is hermetically closed, but air cannot escape during filling
Solution Approach 1:
The vent cannula is prepared in advance as part of the closure formation, creating a controlled opening that allows air to escape during filling. After filling, the cannula is sealed to provide hermetic closure, thus achieving both reliable sealing and ease of air removal during the filling process
3Ease of operation
If the container is designed with a displacement body at the bottom, then complete emptying is facilitated, but significant residual air volume remains between the liquid and container closure
Solution Approach 1:
The vent cannula is formed in advance to provide a dedicated air escape path. This preliminary action, combined with the displacement body design, allows liquid to be completely emptied while air is simultaneously evacuated through the vent cannula, eliminating residual air volume that would otherwise remain above the liquid
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 approach effectively eliminates residual air within the container, ensuring precise and complete emptying of liquid contents without displacing the filling material, enhancing the usability of the container for infusion purposes.
Implementation Method 1
a part of the plastic hose located in the recesses of the head jaws remains unclosed, forming at least one ventilation cannula, and that when the container volume is displaced, the level of the filling material is raised in such a way that at least air can escape from the container via the respective Vent cannula
Data Source
Figure 1~3
Figure 4~5
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AI summary
The invention relates to a method for producing and filling containers (1) made of thermoplastic plastic, in which an extruded plastic hose is inserted into an open mold having movable mold parts, mold parts forming the container (1) are closed, the hose being expanded by a pressure gradient acting on the hose in order to form the container (1), preferably in the form of a bellows, and being filled with filling material, and the level of the filling material is raised by reducing container volume in the direction of the container opening, a container closure (5) for the container opening being formed from the hose by closing head jaws of the mold, wherein said method is characterized in that the container (1), preferably in the region of the container closure (5), is formed in such a way that at least one section of the plastic hose remains unclosed for the time being in order to form a venting cannula (3) and in that, when the container volume is reduced, the level of the filling material is raised in such a way that at least air is displaced from the container (1) through venting cannula (3), and the venting cannula (3) is closed by closing the head jaws or by auxiliary head jaws.