Bi-Injection Preforms With Non-Stick Interface for Flair Containers
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Solution Overview
Problem
The existing methods for creating pre-forms for Flair and Flair-type liquid delivery systems face challenges in preventing bonding between different materials during molding and require additional processing steps to join the inner and outer pre-forms, which can be inefficient and lead to leakage or exposure of the liquid to the environment.
Innovation Solution
The use of a bi-injection molding process to connect the inner and outer pre-forms using the same mold, with a non-stick coating applied between layers to prevent bonding, and an air pressure release mechanism to ensure separation and sealing, allowing for efficient production of pre-forms that can be blown into finished containers without additional processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two different materials are used to make pre-forms, then the pre-forms can be made from materials suitable for different applications (e.g., PET and polyolefin), but the two pre-forms may fuse along their interface and become bonded to one another during molding
Solution Approach 1:
The patent applies local quality by creating a hydrophobic treatment on the inner pre-form surface at the interface region. This treatment modifies only the local surface properties (making it hydrophobic) while leaving the bulk material properties unchanged, allowing different materials to be used without unwanted bonding at the interface
Solution Approach 2:
The hydrophobic treatment acts as an intermediary layer between the two different pre-form materials. This intermediate surface treatment prevents direct bonding between the inner and outer pre-forms while maintaining the integrity of both materials, enabling the use of dissimilar materials like PET and polyolefin
2Reliability
If separate processes are used to join inner and outer containers, then bonding between pre-forms can be controlled, but the manufacturing process becomes inefficient and complex
Solution Approach 1:
The patent merges the molding of inner and outer pre-forms into a single bi-injection molding process. The hydrophobic treatment is applied during the molding process itself rather than as a separate post-processing step, combining multiple operations into one efficient manufacturing cycle
Solution Approach 2:
The hydrophobic treatment is applied preliminarily during the molding process before the pre-forms are separated. By preparing the surface with hydrophobic properties during molding, the patent eliminates the need for separate bonding control processes later, improving manufacturing efficiency
3Ease of manufacture
If the same material is used for both pre-forms, then bonding can be prevented more easily, but the design flexibility and material optimization for specific applications are reduced
Solution Approach 1:
Instead of using the same material throughout, the patent applies a local hydrophobic treatment only at the interface region of the inner pre-form. This allows the use of different materials for the inner and outer pre-forms while maintaining ease of manufacturing by controlling bonding only where necessary
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 enables the efficient production of pre-forms that can be easily separated and sealed, preventing leakage and environmental exposure, while allowing for hot filling and maintaining the integrity of the liquid within the container.
Implementation Method 1
a non-stick coating can be sprayed on the surface that will be between the pre-forms, where the second perform will touch the first one
Implementation Method 2
Flair technology uses a displacement medium, such as air, for example, to maintain a certain pressure between the inner container and the outer container
Data Source
AI summary
A preform can be made from two different materials that do not bond together by a bi-injection process, using the same mold. An outer preform can be fashioned first, then an inner preform molded through a center hole in the outer preform's bottom. The preforms are then connected. Inner/outer preform materials can be different, e.g., PET/polyolefin or polyamide, or the same, e.g., PET/PET—if mutual bonding during the molding of the second is prevented. A non-stick coating can be sprayed on a surface portion of the first preform touching the second perform, then the second container molded. Manufacturing order can be either outer/inner, or inner/outer, and the non-stick coating sprayed on the inside/outside of the perform first molded, followed by molding of the other.