Dual-Preform Assembly with Grooved Channels for Bag Separation
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Solution Overview
Problem
Existing preform assemblies for producing containers result in excessive adhesion between the internal bag and external drum during blow molding, leading to incorrect separation, hindered fluid passage, and incomplete beverage delivery, with potential gas accumulation under pressure.
Innovation Solution
The preform assembly features grooves on the preform surfaces defining preferential channels for fluid passage, ensuring a stable coupling and maintaining a hollow space for uniform fluid distribution, preventing excessive adhesion and facilitating separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blow molding process expands the two preforms, then the container is formed, but the facing surfaces adhere excessively eliminating the hollow space
Solution Approach 1:
The patent introduces protrusions on the external preform and corresponding recesses on the internal preform before the blow molding process. These features are pre-designed to maintain the hollow space during expansion, preventing adhesion between the preforms while allowing the blow molding to proceed correctly.
Solution Approach 2:
The protrusions and recesses act as intermediary elements between the external and internal preforms. They physically prevent the surfaces from adhering completely during blow molding, maintaining the necessary hollow space without interfering with the overall container formation process.
2Manufacturing precision
If the preforms adhere excessively, then the blow molding may be correct, but the separation of internal bag from external drum is incorrect
Solution Approach 1:
The separation features (protrusions and recesses) are built into the preforms before blow molding. This preliminary design ensures that when the container is formed, the internal bag can naturally separate from the external drum at these predetermined locations, guaranteeing complete beverage delivery.
3Strength
If the hollow space is eliminated by adhesion, then the preforms are closely bonded, but fluid passage is hindered
Solution Approach 1:
The protrusions and recesses serve as intermediary structures that allow controlled fluid passage through the hollow space. They provide defined pathways for pressurized fluid to reach the internal bag while maintaining sufficient contact between preforms for structural integrity.
4Strength
If the internal bag cannot separate completely, then structural integrity is maintained, but beverage delivery is incomplete
Solution Approach 1:
The patent designs predetermined separation zones with protrusions and recesses that guide complete bag-drum separation. This ensures the internal bag can fully detach from the external drum during beverage dispensing, allowing complete delivery without compromising container integrity during use.
Data Source
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AI summary
The invention concerns a preform assembly (10) for producing a container (110) comprising an external preform (11) and an internal preform (12), each configured to form respectively an external drum (111) and an internal bag (112) of the container (110), wherein the internal preform (12) can be internally associated with the external preform (11) along a central longitudinal axis (X) so as to define a hollow space (13) with the external preform (11).