Hollow Molded Body Cooling During Ejection
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Solution Overview
Problem
The conventional injection stretch blow molding machine has a lengthy blow molding process, which affects the efficiency of the overall molding cycle due to the time required for fixing the container shape, and attempts to shorten the injection molding process by releasing preforms early are hindered by the equal allocation of time to all processes.
Innovation Solution
Implementing a cooling device that blows cooling air into the hollow molded body during the ejection process to complete the fixation of the container shape, thereby shortening the operation time in the stretch blow molding section and optimizing the molding cycle by shifting the solidification period from the blow molding process to the ejection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the blow molding process time is extended to ensure proper cooling and fixation of the container shape, then the manufacturing precision and reliability improve, but the productivity decreases due to the lengthy molding cycle
Solution Approach 1:
The invention applies preliminary action by initiating the cooling process earlier than conventional methods. The cooling fan starts blowing cooling air during the holding stage before the molded product is fully ejected, and the ejection section continues cooling the product after ejection. This overlapping of cooling operations with other process stages reduces the total cycle time while ensuring proper container shape fixation.
Solution Approach 2:
The invention implements continuity of useful action by maintaining cooling operations throughout the entire molding cycle rather than as a separate discrete step. The cooling fan operates continuously from the holding stage through ejection, and the ejection section provides continued cooling, ensuring the container shape is fixed without creating idle time in the molding cycle.
2Productivity
If the injection molding process time is shortened by releasing preforms early, then the productivity improves, but the manufacturing precision deteriorates due to insufficient cooling time
Solution Approach 1:
The invention applies preliminary action by starting the cooling process during the holding stage before the molded product is ejected. The cooling fan begins blowing cooling air at this early stage, and the ejection section continues the cooling process after ejection, ensuring sufficient cooling time is provided even when the injection molding cycle is shortened.
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 reduces the time allocated to the blow molding process, allowing for a shorter molding cycle and improved production efficiency by ensuring the container shape is solidified during the ejection process, thus balancing the time allocated to each process in the cycle.
Implementation Method 1
a cooling device configured to blow the cooling air into the inside of the hollow molded body conveyed to the ejection section
Implementation Method 2
blows the cooling air into the inside of the hollow molded body to cool the hollow molded body
Data Source
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AI summary
Fixation of a container shape of a hollow molded body is not completed during a blow molding process but is completed during an ejection process of an ejection section, thereby shortening an operation time in a stretch blow molding section, and improving the production efficiency of hollow molded bodies by shortening the time required for the blow molding process during a molding cycle. Cooling air is blown into the inside of the hollow molded body disposed in the ejection section in the ejection process C during the blow molding process B in the next molding cycle to cool the hollow molded body disposed in the ejection section to solidify the container shape.