Plastic Container Production Line with Segmented Thermal Conditioning
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Solution Overview
Problem
Existing plastic container production lines face productivity limitations due to the time required for cooling and thermal conditioning of preforms, which depends on their type and geometry, leading to reduced efficiency and potential damage during transfer from blow-moulding to filling machines.
Innovation Solution
A flexible apparatus with independent speed control for compression-moulding and blow-moulding machines, combined with a thermal conditioning station and variable advance paths for preforms, allows for optimized cooling and heating processes, ensuring preforms are not damaged during transfer and enabling synchronous operation of machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the moulding machine operates at high speed to increase productivity, then productivity improves, but the preforms do not cool sufficiently leading to shape instability and crystallisation
Solution Approach 1:
The production process is segmented into distinct zones: a first zone for rapid moulding and transfer, and a second zone for controlled cooling. This allows the moulding machine to operate at high speed while the preforms receive adequate cooling time in the second zone, resolving the contradiction between productivity and shape stability.
Solution Approach 2:
A transfer mechanism acts as an intermediary between the moulding machine and the cooling zone. This intermediary enables the preforms to be quickly transferred from the high-speed moulding zone to the controlled cooling zone, maintaining both high productivity and proper cooling.
2Manufacturing precision
If the moulding machine is slowed down to allow sufficient cooling time, then preform shape stability improves, but productivity decreases
Solution Approach 1:
The production line is divided into multiple functional zones with different speed characteristics. The first zone maintains high speed for moulding and transfer, while the second zone provides slower, controlled cooling. This segmentation allows the system to achieve both high productivity and shape stability without requiring the entire line to operate at reduced speed.
3Manufacturing precision
If the thermal conditioning station processes preforms sequentially one after another, then temperature control precision improves, but the dwelling time increases reducing productivity
Solution Approach 1:
The thermal conditioning process is segmented into a first zone for rapid transfer and a second zone for controlled thermal processing. This allows preforms to be quickly moved through the first zone and then subjected to precise temperature control in the second zone, maintaining temperature precision while reducing overall dwelling time.
Solution Approach 2:
The system maintains continuous operation by allowing the thermal conditioning station to process multiple preforms in sequence without interrupting the overall production flow. The segmented zone structure ensures that while one preform is being thermally conditioned, other preforms can be processed in parallel zones, maintaining continuous productive action.
4Device complexity
If the advance path for preforms is fixed, then device simplicity is maintained, but adaptability to different preform types and geometries is reduced
Solution Approach 1:
The advance path length is made variable rather than fixed, allowing the system to adapt to different preform types and geometries. The variable path length enables optimization of cooling and thermal conditioning time for each specific preform type, enhancing adaptability without significantly increasing device complexity.
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 solution enhances productivity by allowing for high-efficiency container production and packaging, ensuring containers are not damaged during transfer and are filled hygienically and efficiently, with optimized temperature control for uniform expansion and filling.
Implementation Method 1
the preforms, before being positioned on the blowing machine, have to be suitably heated
Implementation Method 2
the preforms, after being compression-moulded and before they advance to the thermal conditioning station, require a cooling step that is suitable for stabilising the shape thereof and for avoiding crystallisation phenomena
Data Source
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AI summary
An apparatus (301) for producing plastic containers, comprises: a machine for producing plastic preforms; a blow-moulding machine for blowing such preforms to obtain containers, having a blow-moulding carousel (306) provided with a plurality of blow-moulding moulds (16) that expand the preforms to obtain the containers; a thermal conditioning station (308) interposed between the machine for producing the preforms and the blow-moulding machine; a storage station (322), positioned in a storing zone (332) for containing preforms; a supplying system (326) for removing the preforms stored in the storage station (322) to insert said preforms into a production line defined by the apparatus (301).