Liquid Blow Molding Nozzle Unit for Air Entrainment Prevention
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Solution Overview
Problem
Conventional liquid blow molding methods face issues with air entrainment in the liquid container manufacturing process, leading to instability in molding conditions and moldability due to bubbled liquids, which affects the accuracy of container capacity and shape.
Innovation Solution
A liquid container manufacturing method using a nozzle unit with separate gas inflow and outflow paths, allowing for controlled air discharge and liquid management through a discharge rod, enabling precise formation of a headspace within the container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid is supplied to the preform interior through the blow nozzle during molding, then the container is filled with content liquid concurrently with molding, but air becomes entrained in the liquid and bubbled into the liquid supply path, causing instability in molding conditions
Solution Approach 1:
The liquid supply path is divided into two separate paths: a first liquid supply path for supplying liquid to the preform interior during molding, and a second liquid supply path for supplying liquid to discharge air from the preform. This segmentation prevents air bubbles from the first path from contaminating the liquid supply system, thereby maintaining molding condition stability while preserving manufacturing efficiency.
Solution Approach 2:
A discharge rod with a discharge port is introduced as an intermediary device. The discharge rod extends into the preform interior and provides a dedicated pathway for air discharge during the molding process. This intermediary structure enables separate air evacuation without interfering with the liquid supply path, preventing air entrainment issues while maintaining concurrent filling capability.
2Productivity
If liquid is supplied to the preform interior during molding, then the container is filled with content liquid concurrently with molding, but the bubbled liquid affects moldability and accuracy of container capacity and shape
Solution Approach 1:
The liquid supply system is segmented into separate paths for molding liquid supply and air discharge liquid supply. This prevents bubbled liquid from the molding process from entering the air discharge path and affecting container precision, while maintaining the efficiency benefits of concurrent filling.
Solution Approach 2:
The discharge rod acts as an intermediary device that facilitates air discharge through a separate pathway. By providing this dedicated air evacuation route, the system prevents air bubbles from interfering with the molding process and container precision, while maintaining high manufacturing efficiency.
3Manufacturing precision
If air is discharged from the preform interior through the blow nozzle after molding, then the headspace is formed, but the liquid in the container is bubbled with air and introduced into the liquid supply path
Solution Approach 1:
Two separate liquid supply paths are implemented: one for molding liquid supply and another for air discharge liquid supply. This segmentation ensures that air discharged during headspace formation does not carry liquid bubbles back into the molding liquid supply path, maintaining supply path stability while enabling accurate headspace formation.
Solution Approach 2:
The discharge rod serves as an intermediary device that provides a dedicated pathway for air discharge during headspace formation. This separate path prevents bubbled liquid from entering the liquid supply system, ensuring both headspace formation accuracy and liquid supply path reliability.
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 ensures high accuracy in manufacturing liquid containers with predetermined capacities and shapes by preventing air entrainment and stabilizing the molding process.
Implementation Method 1
supplying the liquid pressurized by a pressurized liquid supply source to an interior of the preform through the supply path
Implementation Method 2
introducing the gas that is pressurized to an interior of the liquid container through the gas inflow path
Data Source
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AI summary
A liquid container manufacturing method includes: a liquid blow molding step of molding a preform (2) into a liquid container (C) having a shape conforming to an inner surface of a blow-molding mold (10), by supplying a pressurized liquid (L) to an interior of the preform (2) through a supply path in a state where a blow nozzle (23) is engaged to a mouth (2a) of the preform (2); and a headspace forming step of forming a headspace (HS) in the liquid container (C), by discharging the liquid (L) from an interior of the liquid container (C) through a discharge port (28a) provided in a discharge rod (28) extending to the interior of the liquid container (C) through the blow nozzle (23), by introducing a pressurized gas to the interior of the liquid container (C) through a gas inflow path (34) in a state where the supply path is closed.