Preform Base Embossing for Blow Molding Material Distribution
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Solution Overview
Problem
Current methods for producing preforms for blow-molding struggle to achieve optimal thermal profiles and wall thicknesses in the base and shoulder regions, leading to material accumulations and weakened bottle quality due to premature material setting and inadequate thermal energy distribution.
Innovation Solution
Mechanical deformation of the preform base and shoulder regions using embossing bodies in a conditioning station, which enlarges the surface area and reduces wall thickness, allowing for more efficient thermal energy input and controlled stretching during blow-molding, while maintaining the original progression of the preform shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the preform wall thickness in the domed base end region is reduced to improve material distribution during blow-molding, then the thermal profile and material flow are improved, but the preform wall becomes too thin causing premature setting and shrinkage during cooling
Solution Approach 1:
The invention applies embossing as a preliminary action after injection molding but before blow-molding. The embossing process mechanically deforms the preform base region to create the desired thin wall thickness profile and surface area enlargement in advance, preparing the preform for optimal material distribution during subsequent blow-molding without causing premature setting issues
Solution Approach 2:
The invention changes the physical state and geometry parameters of the preform base region through embossing. By applying mechanical deformation at controlled temperature, the wall thickness is reduced and surface area is enlarged in the base region, transforming the preform geometry to achieve optimal material flow characteristics for blow-molding
2Use of energy by moving object
If the preform base surface area is enlarged through embossing to improve thermal energy absorption, then the infrared heater efficiency is improved, but the manufacturing process complexity increases
Solution Approach 1:
The invention merges the embossing function with the existing conditioning station in the blow-molding machine. By integrating the embossing mechanism into the conditioning station that already handles preform preparation, the system achieves surface area enlargement and thermal energy absorption improvement without adding a completely separate complex device
Solution Approach 2:
The embossing bodies act as intermediary elements between the conditioning station and the preform base region. These embossing bodies mechanically deform the preform surface to create enlarged surface area, serving as a mediator that improves thermal energy absorption from infrared heaters without requiring direct modification of the heating system
3Ease of manufacture
If the preform is cooled intensively in the mold during injection molding to enable demolding, then the demolding process is simplified, but the base and shoulder regions lack sufficient thermal energy for optimal blow-molding
Solution Approach 1:
The embossing process serves as a preliminary thermal preparation action before blow-molding. By mechanically deforming the base and shoulder regions during the conditioning phase, the invention creates geometric features that will absorb thermal energy more efficiently during the subsequent blow-molding heating phase, compensating for the intensive cooling that occurred during injection molding
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 method results in enhanced base and shoulder regions with thinner wall thicknesses, improved material distribution, and increased bottle quality by preventing material accumulations and strengthening the base, thus optimizing the blow-molding process.
Implementation Method 1
Mechanical deformation of the preform base and shoulder regions using embossing bodies
Implementation Method 2
the infrared heaters of the downstream blow-molding machines can introduce thermal energy more efficiently
Data Source
AI summary
A device and a method for producing a preform having a shoulder and base geometry optimized for subsequent stretch blow molding, since the preform cannot be produced according to the conventional injection-molding method. For this purpose, the preform produced in the injection-molding tool is transferred into a conditioning station and is conditioned and cooled in the shaft while no contact is made with the top of the preform and the preform shoulder on account of a special contour of the conditioning receptacle. Due to the reheating of these preform regions they can be mechanically deformed into a new geometry which is advantageous for the blow molding process and thus their wall thickness can also be influenced. In the subsequent blow molding process the deformed preform has the advantage that the plastic material which is distributed better in the bottle results in considerable material savings and higher quality bottles.