Blow Molding Nozzle Fluid Extraction System

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Solution Overview

Problem

In known blow molding apparatuses, an incompressible fluid can drip down from the blow nozzle after blow molding, adhering to the molded container or the mold, especially when using highly viscous liquids like shampoo or liquid detergent.

Innovation Solution

The blow molding apparatus includes a mold, a blow nozzle, a sealing body, and a pressurized fluid supply unit. It features a drawing and discharging flow path with a fluid drawing source and a pressurized gas supply source. After blow molding, the fluid drawing source draws the incompressible fluid adhering to the blow nozzle into the flow path, and the pressurized gas supply source causes the fluid to flow out through a drawing orifice, preventing it from dripping onto the container or mold.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If incompressible fluid is used as pressurizing medium to simplify the filling process, then the production process is simplified and filling step can be omitted, but the incompressible fluid drips down from the blow nozzle and adheres to the molded container or mold

Engineering Contradiction:

Improveproduction process simplificationVSAvoidfluid adhesion to container or mold

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the harmful incompressible fluid from the blow nozzle surface by introducing a drawing flow path that draws the fluid away from the nozzle. The drawing source creates negative pressure to pull the fluid through the drawing flow path, effectively separating the fluid from the harmful adhesion location.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces air as an intermediary substance to counteract the harmful effect of the incompressible fluid. By supplying pressurized air through the counter-pressure flow path, the air acts as a mediator to prevent fluid adhesion and facilitate fluid removal from the blow nozzle area.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If highly viscous liquid is used as incompressible fluid for blow molding, then the blow molding process can be performed, but it takes long for the liquid to start dripping down and the liquid continues to run in a thin stream, increasing adhesion risk

Engineering Contradiction:

Improveblow molding process capabilityVSAvoidtime for liquid to start dripping

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by actively drawing the incompressible fluid through the drawing flow path immediately after blow molding, rather than waiting for gravity to cause natural dripping. The drawing source initiates fluid removal before the fluid would naturally begin to drip, reducing the time the fluid remains on the blow nozzle surface.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces the natural gravitational dripping mechanism with an active drawing mechanism. Instead of relying on gravity to pull the viscous fluid down (which takes time for highly viscous liquids), the drawing source creates negative pressure to actively pull the fluid through the drawing flow path, overcoming the viscosity-related delay.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 configuration effectively prevents the incompressible fluid from dripping down from the blow nozzle and adhering to the molded container or the mold, ensuring cleaner production and reduced adhesion issues.

Implementation Method 1

a fluid drawing source connected to the drawing and discharging flow path and configured to apply drawing force to the drawing and discharging flow path, after blow molding is completed and after and/or while the blow nozzle is moved from the connected position to the standby position while the sealing body is closed, so as to draw the incompressible fluid adhering to the blow nozzle into the drawing and discharging flow path

Methodology Applied

Scientific EffectSuction: Suction

Implementation Method 2

a pressurized gas supply source connected to the drawing and discharging flow path and configured to supply a pressurized gas to the drawing and discharging flow path, after blow molding is completed and after a next preform is placed into the mold, so as to cause the incompressible fluid that has been drawn into the drawing and discharging flow path by the fluid drawing source to flow out through the drawing orifice

Methodology Applied

Scientific EffectPressurized gas flow: Pressure Gradient

Data Source

PatentUS12246479B2Blow molding device

Publication Date: 2025.03.11 YOSHINO KOGYOSHO CO LTD

AI summary

A blow molding apparatus is configured to blow mold a preform into a container by supplying a pressurized incompressible fluid into the preform from a pressurized fluid supply unit. The blow molding apparatus includes: a drawing and discharging flow path connected to a drawing orifice; a fluid drawing source to apply drawing force to the drawing and discharging flow path, after blow molding is completed and after and/or while the blow nozzle is moved to a standby position, to draw the incompressible fluid adhering to the blow nozzle; and a pressurized gas supply source to supply a pressurized gas to the drawing and discharging flow path, after blow molding is completed and after a next preform is placed into the mold, to cause the incompressible fluid inside the drawing and discharging flow path to flow out toward the inside of the preform or toward the inside of a container.