Admixing Closure Device Gas-Tight Plastic Seal Injection Molding
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Solution Overview
Problem
Existing closure devices for containers, such as beverage bottles, are inefficient in providing a gas-tight and fluid-tight connection between the chamber and the chamber end piece, and are costly and time-consuming to produce due to their monolithic design in polyethylene or polypropylene, which lacks sufficient barrier properties against gases like oxygen and carbon dioxide.
Innovation Solution
A closure device where the chamber and chamber end piece are connected using a plastic seal injection-molded from the same thermoplastic polymer, such as polybutylene terephthalate (PBT), forming a unit that is fluid-tight and gas-tight, allowing for easier production and improved barrier properties without additional reinforcement, and can be easily integrated with a cover element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the chamber and cover element are made as one piece from polyethylene or polypropylene, then the production is simpler, but the barrier properties against gases such as oxygen and carbon dioxide are insufficient
Solution Approach 1:
The closure device is divided into separate components: the chamber (5) and the cover element (3) are produced as separate parts and then connected. This allows each component to be optimized independently - the chamber can be made from materials with superior gas barrier properties while the cover element maintains its structural function, resolving the contradiction between manufacturing simplicity and gas barrier performance.
2Reliability
If the chamber and chamber end piece are connected with additional seals or reinforcement, then the gas-tightness is improved, but the production time and cost increase
Solution Approach 1:
The chamber (5) and chamber end piece (9) are connected through a merging process where the materials are bonded together to form an integral connection. This eliminates the need for separate seals or reinforcement elements, achieving gas-tight connectivity while maintaining production efficiency and avoiding additional manufacturing steps.
3Reliability
If injection-moulding is used to connect the chamber and chamber end piece, then the connection is fluid-tight and gas-tight, but the process is material- and time-consuming
Solution Approach 1:
The connection process utilizes parameter changes in the thermoplastic materials during bonding. By controlling temperature, pressure, and material flow during the connection of the chamber and chamber end piece, the process achieves reliable fluid-tight and gas-tight sealing through the natural properties of thermoplastics, avoiding the need for extensive injection-moulding operations.
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
The solution enables a quick, cost-effective, and reliable gas-tight and fluid-tight connection, enhancing the barrier against gases and improving mechanical stability, suitable for pressurized chambers and reducing production complexity.
Implementation Method 1
a plastic seal (10) that is injection-moulded on the chamber (5) and the chamber end piece (9)
Data Source
AI summary
A closure device for a container comprising a cover element for closing the container, a chamber arranged on the cover element and an inner housing. The chamber has a chamber end piece having an outlet opening that can be closed by means of a closure means. The inner housing comprises opening means for opening the outlet opening, wherein the chamber can be moved relative to the inner housing from a closed position into an outlet position. The chamber and the chamber end piece are connected to each other in a fluid-tight and gas-tight manner by means of a plastic seal injection molded on chamber and chamber end piece, wherein chamber, chamber end piece and plastic seal are formed from the same plastic. The invention further relates to a method for producing a closure device or a chamber.