Blow Mold Electric Heating Elements for Uniform Preform Temperature
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional container forming systems face issues with non-uniform heating and alignment changes due to block expansion during blow molding, leading to inefficiencies and increased costs in maintaining mold alignment.
Innovation Solution
The system employs electric heating elements positioned adjacent to the inner mold surface of the blow mold, allowing for precise and efficient heating of the preform, reducing thermal expansion issues and enabling controlled temperature distribution for forming high-crystallinity containers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If hot liquid is channeled through the block to deliver heat to the molds, then heat is provided to facilitate forming, but the block expands and alignment of the molds changes during operation
Solution Approach 1:
The patent replaces the mechanical block heating system with electric heating elements that are coupled directly to the blow mold. This substitution eliminates the thermal expansion of the block while still providing the necessary heat to the mold surface, thereby maintaining mold alignment precision while achieving the required temperature for forming.
Solution Approach 2:
The patent applies heating locally at the mold surface through electric heating elements rather than heating the entire block. This localized heating approach provides the necessary temperature at the critical interface (mold surface) without causing thermal expansion of the supporting structure, thus resolving the contradiction between temperature requirement and alignment precision.
2Temperature
If conventional block heating is used, then heat is delivered to molds, but heating is not uniform across the mold surface
Solution Approach 1:
The patent employs multiple electric heating elements positioned at different locations on the blow mold to provide localized heating control. This allows each heating element to target specific areas of the mold surface, ensuring uniform heat distribution across the entire mold surface rather than the non-uniform heating caused by block heating.
Solution Approach 2:
The heating system is divided into multiple independent electric heating elements rather than a single block heating source. This segmentation allows for independent control and optimization of heat delivery to different regions of the mold, achieving uniform heating across the mold surface.
3Manufacturing precision
If equipment is added to compensate for block expansion and mold alignment changes, then alignment can be maintained, but the system becomes costly and complex
Solution Approach 1:
The patent eliminates the need for complex alignment compensation equipment by replacing the block heating system with electric heating elements. This substitution removes the root cause of alignment problems (block thermal expansion) rather than adding corrective equipment, thereby maintaining mold alignment while reducing system complexity and cost.
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 results in containers with higher crystallinity and a higher maximum recommended fill temperature, enhancing filling processes by reducing cooling times and maintaining container integrity under high temperatures.
Implementation Method 1
electric heating elements coupled to the blow mold and positioned adjacent the inner mold surface to heat the inner mold surface
Data Source
AI summary
A system for forming a container includes an injection station configured to inject a liquid material into a mold to form a preform. The system also includes a forming station including an apparatus for forming a container. The apparatus includes a blow mold configured to receive the preform and inject air into the preform to form the container. The blow mold includes an inner mold surface. The apparatus also includes at least one stretching rod configured to contact the preform in the blow mold and stretch the preform. The apparatus further includes electric heating elements coupled to the blow mold and positioned adjacent the inner mold surface to heat the inner mold surface. The system further includes a removal station configured to release the container from the system.