Bag-in-Bottle Preform Interlock Embedding
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Solution Overview
Problem
Existing bag-in-bottle container preforms require complex processes and machine modifications to prevent interlock damage during the blow-molding process, as the interlock must be kept cool to avoid deformation or separation of layers.
Innovation Solution
A preform design where the interlock is embedded into the inner layer of the outer layer, allowing for connection without requiring heat shielding or machine modifications, achieved by forming the interlock as part of the outer layer and then embedding it into the inner layer during the molding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the preform is heated during the blow-molding process to form the desired shape, then the preform can be formed to the desired shape, but the interlock must be kept cold to avoid damage and deformation or separation of layers
Solution Approach 1:
The preform is divided into distinct regions: the interlock region and the body region. Different thermal treatments are applied to each region - the interlock is kept cool while the body is heated, allowing simultaneous protection of the interlock and formation of the preform shape.
Solution Approach 2:
Different thermal conditions are applied to different parts of the preform. The interlock region maintains a cool state to preserve its structural integrity, while the body region is heated to enable plastic deformation and shape formation during blow-molding.
2Reliability
If heat shielding is placed around the interlock or air is blown on the interlock to limit temperature increase, then the interlock temperature is controlled, but complex processing and machine modifications are required
Solution Approach 1:
The preform design inherently protects the interlock through its structural configuration and material properties. The interlock is formed as an integral part of the preform with automatic thermal management during the blow-molding process, eliminating the need for external heat shielding or cooling systems.
3Strength
If the interlock is connected to the outer layer to connect inner and outer layers, then the bag-in-bottle structure is formed, but the interlock is exposed to heat damage and deformation during blow-molding
Solution Approach 1:
The interlock is embedded within the outer layer of the preform, with the stem extending through the outer layer and the head portion nested within it. This nested configuration protects the interlock from direct heat exposure while maintaining its structural connection function between the inner and outer layers.
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
Enables the formation of bag-in-bottle containers without complex processing or machine changes, ensuring the interlock remains intact and reducing the risk of damage during the blow-molding process, thus facilitating efficient production.
Implementation Method 1
the preform is typically heated such that the preform can be formed to the desired shape
Implementation Method 2
the interlock must be kept cold, in order to avoid damage and deformation of the interlock
Data Source
AI summary
A preform including a preform neck; a preform body extending from the neck; and a preform end cap extending from the preform body; wherein the body and end cap have: an inner layer having an inner layer inner surface and an inner layer outer surface; an outer layer having an outer layer inner surface and an outer layer outer surface; wherein the inner layer is positioned interior to the outer layer, characterized in that outer layer in the end cap have an interlock, wherein the interlock includes a stem and a head extending from the stem, the interlock being connected to the outer layer inner surface by the stem, such that the inner layer and outer layer are connected in the end cap by the interlock.