Parison Blowing with Mould Vacuum Evacuation
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Solution Overview
Problem
Existing blowing systems struggle to efficiently produce containers with complex shapes and require high introduction pressures, which slows down production and increases costs.
Innovation Solution
A method and system that incorporates a pressurized fluid introduction and simultaneous gas suction through strategically placed openings in the mould, allowing for controlled pressure and suction profiles to facilitate the shaping of complex containers by improving adhesion of the parison to the mould walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high introduction pressure is used to blow the parison, then the parison can fill the mould effectively, but the production speed decreases and energy consumption increases
Solution Approach 1:
The patent applies preliminary action by evacuating air from the mould cavity before introducing the blowing fluid. This pre-evacuation step (performed by vacuum sources connected to evacuation holes in the mould) removes air that would otherwise resist parison expansion, allowing subsequent blowing at lower pressures to achieve effective parison filling and faster production cycles
2Manufacturing precision
If high introduction pressure is used to blow the parison, then the parison can fill the mould effectively, but energy consumption increases
Solution Approach 1:
The patent applies preliminary action by evacuating air from the mould cavity before introducing the blowing fluid. This pre-evacuation step (performed by vacuum sources connected to evacuation holes in the mould) removes air that would otherwise resist parison expansion, allowing subsequent blowing at lower pressures to achieve effective parison filling and faster production cycles
3Reliability
If air evacuation holes are provided in the mould, then air can be expelled during parison expansion, but the system complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the mould into multiple sections with distributed evacuation holes and associated vacuum sources. This segmentation allows air to be evacuated from different regions of the mould cavity simultaneously or sequentially, improving air removal efficiency while maintaining a modular, manageable mould structure that can be manufactured and maintained more easily
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 production of containers with complex shapes while reducing the required pressurization pressure, thereby speeding up the production process and achieving economic savings through improved adhesion and controlled forming operations.
Implementation Method 1
A pressurised fluid is introduced into the parison which causes the deformation thereof. The pressurised fluid introduced into the parison allows the parison to expand and fill the mould
Implementation Method 2
There are air evacuation holes in the mould which allow to put the inside and the outside of the mould in communication with each other. The evacuation holes allow the air present in the mould to be expelled following the expansion of the parison
Data Source
AI summary
A production method for blowing a container starting from a parison comprising the steps of:i) positioning a parison inside a forming mould (2) for forming the container;ii) deforming the parison (10) placed in the mould (2); the step of deforming the parison (10) comprising the sub-steps of:introducing a pressurised fluid into the parison (10) placed in the mould (2);sucking gas which is located inside the mould (2) and outside the parison (10) present in the mould (2).