Preform Shuttle Heating Layout for Uniform Blow Molding
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Solution Overview
Problem
Existing blow molding and filling processes are inefficient, costly, and environmentally impactful due to separate operations, temperature gradients in preform heating leading to uneven container formation, and high power consumption by conventional heaters.
Innovation Solution
A modular manufacturing cell with vertically and horizontally oriented heating elements, controlled and positioned selectively based on preform characteristics, and a queuing/sequencing system to optimize heating and minimize waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a linear oven or heater is used to heat preforms in continuous blow molding, then preforms can be heated sequentially along a linear path, but temperature gradients occur between preforms resulting in uneven heating and container rejection
Solution Approach 1:
The heating system is segmented into multiple independent heating zones along the linear path, with each zone capable of independent temperature control. This allows different sections of the oven to be optimized for different preform positions, compensating for temperature gradients and ensuring uniform heating across all preforms processed simultaneously.
Solution Approach 2:
Different heating zones are configured with different heating intensities and durations based on the specific thermal requirements of preforms at different positions in the linear path. Preforms experiencing greater temperature gradients receive enhanced or extended heating in specific zones to achieve uniform temperature distribution.
2Productivity
If conventional high-power heaters are used to heat preforms at 200,000-400,000 Watts to support 8,000-16,000 containers per hour, then production capacity is achieved, but power consumption and environmental impact increase significantly
Solution Approach 1:
Instead of continuous high-power heating, the system uses periodic or pulsed heating cycles where heating elements are activated only when and where needed. Preforms are heated in discrete zones as they pass through specific sections of the linear path, reducing overall energy consumption while maintaining production throughput.
Solution Approach 2:
The heating system dynamically adjusts temperature parameters, heating duration, and power levels based on real-time detection of preform temperature and position. This optimized parameter control reduces energy waste while ensuring preforms reach the required temperature for blow molding at the necessary production rate.
3Ease of manufacture
If preforms are heated in first-in-first-out sequence through a linear oven, then processing flow is simplified, but temperature gradients cause some preforms to be improperly heated leading to container rejection and scrapping
Solution Approach 1:
Temperature sensors and detection systems monitor the thermal state of preforms in real-time as they move through the heating zones. This feedback information is used to dynamically adjust heating parameters for individual preforms or groups, ensuring each preform receives appropriate heating regardless of its position in the sequence, thereby reducing scrap rate while maintaining process simplicity.
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
Improves efficiency, reduces environmental impact, and decreases power consumption by enabling precise preform heating and reducing space requirements, minimizing container rejection and waste.
Implementation Method 1
a heater for a preform comprises: at least one first heating element positioned in a substantially vertical orientation; and a plurality of second heating elements disposed adjacent the at least one first heating element, wherein the second heating elements are positioned in a substantially horizontal orientation
Data Source
AI summary
A method and system for manufacturing containers are disclosed. The system includes one or more manufacturing cells comprised of an unloading station, a queuing/sequencing station, a heating station, an unloading station, and a molding station. The queuing/sequencing station utilizes a plurality of carrier shuttles configured to traverse a platform comprised of a plurality of induction coil sections. Each of the carrier shuttles is provided with a preform mount for receiving a preform thereon. The preforms are selected and the carrier shuttles are arranged in accordance with a predetermined sequence. At least one heater of the heating station is disposed over one of the induction coil sections and adapted to heat the preform. The heated preforms are transported by the carrier shuttles from the heating station to an unloading station, which transitions them to the molding station for a fluid (e.g., gas or liquid) blow molding operation to form the containers.