Liquid Blow Molding Container Headspace Formation
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Solution Overview
Problem
Conventional container production methods require a complicated blow molding mold configuration with a built-in compression tab and drive mechanism to form a desired headspace, increasing production costs.
Innovation Solution
A container production method involving liquid blow molding of a synthetic resin preform using a blow molding mold that can be separated into multiple pieces, where a filling nozzle connected to a liquid supply path is used to form a headspace by discharging a predetermined amount of content liquid from the container after molding, without the need for a complex mold configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a built-in compression tab with drive mechanism is used in the blow molding mold, then a headspace of desired size can be formed in the container, but the mold configuration becomes complicated and production cost increases
Solution Approach 1:
The compression tab and drive mechanism are extracted from the blow molding mold itself and implemented as a separate pressing portion that is temporarily introduced from the outside during the molding process. This allows the mold to remain simple while still achieving the required headspace formation through external pressing after the container is formed
Solution Approach 2:
The pressing portion is introduced and acts on the container trunk after the blow molding is complete but while the container is still within the mold cavity. This preliminary action discharges the exact amount of liquid needed to create the headspace before the container is removed from the mold, achieving precise headspace formation without complex integrated mechanisms
2Manufacturing precision
If a compression tab and drive mechanism are built into the blow molding mold, then liquid can be discharged to form headspace, but production cost increases
Solution Approach 1:
The complex compression tab and drive mechanism are extracted from the mold structure and replaced with a simple external pressing portion that can be easily manufactured and positioned. This extraction eliminates the need for expensive integrated mechanisms while maintaining the ability to form the required headspace
Solution Approach 2:
The pressing portion is designed as a simple, inexpensive component that is introduced temporarily during the molding process and then removed. This disposable-like approach to the pressing mechanism avoids the high cost of building permanent, complex mechanisms into the mold structure
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 method allows for the formation of a desired headspace in containers without complicating the blow molding mold configuration, reducing production costs and simplifying the production line setup.
Implementation Method 1
liquid blow molding the preform into a shape conforming to a cavity of the blow molding mold by supplying a pressurized liquid supplied to the liquid supply path from the filling nozzle into the preform
Implementation Method 2
pressing a trunk of the container after molding with a pressing portion inserted from a clearance of the separated mold pieces adjacent to each other to discharge a liquid in the container to the outside of the container
Data Source
AI summary
A container production method including a preform setup step of disposing a preform in a blow molding mold and engaging a filling nozzle with a mouth of the preform; a blow molding step of liquid blow molding the preform by supplying a pressurized liquid into the preform; a liquid discharge step of releasing the blow molding mold and pressing a trunk of the container after molding with a pressing portion that is inserted from a clearance between separated mold pieces adjacent to each other to discharge a liquid in the container to the outside of the container by a predetermined amount; and a headspace forming step of forming a headspace in the container by separating the filling nozzle from a mouth of the container.