Capping Device Piston Pressurization for Plastic Containers
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Solution Overview
Problem
Existing capping machines for pourable products, especially those in plastic containers, face challenges in simplifying the pressurization process and reducing plastic usage, leading to containers that are prone to deformation during handling and palletization due to insufficient structural stiffness.
Innovation Solution
A capping device that integrates a capping head with a control rod and a tubular sleeve, where the capping portion acts as a piston within the sleeve to pressurize the container's neck area during cap application, eliminating the need for additional pressurizing agents like nitrogen and simplifying the pressurization process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If plastic containers are used to reduce material usage, then material consumption is reduced, but structural stiffness deteriorates causing deformation during handling and palletization
Solution Approach 1:
The invention changes the physical parameter of the container by introducing pressurized gas into the headspace, transforming the container from an unpressurized to a pressurized state. This parameter change provides the necessary structural stiffness to thin-walled plastic containers during handling and palletization, resolving the contradiction between using less plastic material and maintaining adequate strength.
2Strength
If nitrogen pressurization is used to stiffen containers, then container strength is improved, but device complexity and process steps increase
Solution Approach 1:
The invention merges the pressurization function with the existing capping operation by integrating a pressurization chamber and gas injection system into the capping device. The container is pressurized with gas (such as nitrogen or carbon dioxide) immediately before capping, combining two previously separate operations into one integrated process, thereby reducing overall device complexity while maintaining container strength.
Solution Approach 2:
The invention applies preliminary pressurization to the container headspace before the capping operation. By pre-pressurizing the container with gas, the container gains the necessary structural stiffness before it undergoes the capping process and subsequent handling, ensuring that the container can withstand palletization forces without requiring complex post-capping pressurization systems.
3Ease of operation
If conventional capping machines are used, then capping function is provided, but pressurization process requires separate means and agents
Solution Approach 1:
The invention combines the pressurization and capping functions into a single integrated device. The capping device includes a pressurization chamber that receives the container, a gas injection system that pressurizes the headspace, and a capping portion that applies the cap. This integration eliminates the need for separate pressurization equipment and simplifies the overall operation while maintaining ease of use.
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 solution effectively stiffens the container neck, reducing deformation risks during palletization while eliminating the need for nitrogen pressurization, thereby enhancing the capping process efficiency and reducing costs.
Implementation Method 1
the capping portion (12) acts as a piston within the sleeve to pressurize the container's neck area during cap application
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
There is described a capping device (6, 6') configured to apply caps (3) onto containers (2) containing a pourable product and comprising: a support member (7) for supporting one container (2) to be capped at a time; a sleeve (14) having a longitudinal axis (A), a first axial opening (15) facing the support member (7) and a second axial opening (16); and a capping head (8) extending along the longitudinal axis (A) and slidably engaging the second axial opening (16) of the sleeve (14) thereby closing it; the capping head (8) has a capping portion (12) for receiving and retaining one cap (3) at a time and arranged within the sleeve (14) and being axially movable through the sleeve (14) for applying the cap (3) to the respective container (2); wherein the sleeve (14) is axially movable towards and away from the support member (7) and between: a first position, in which the first axial opening (15) is open and axially spaced from the support member (7); and a second position, in which the sleeve (14) is configured to cooperate in contact with the support member (7) or with the container (2) for closing the first axial opening (15) and thereby delimiting a pressurization chamber (17) configured to be pressurized for pressurizing an inner environment of said container (2) supported, in use, by the support member (7).