Inflation Molding Bubble Control for Stable Diameter Changes

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Solution Overview

Problem

Inflation molding processes face challenges in changing the diameter of a bubble without destabilizing it, leading to increased material loss due to prolonged instability and vibration.

Innovation Solution

A control device that adjusts the gas supply/exhaust amount difference based on real-time bubble state information to prevent the bubble from entering an unstable state by specifying an index value for the air supply/exhaust amount difference, ensuring stable diameter changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the gas supply/exhaust amount difference is increased to change the bubble diameter, then the diameter change speed is improved, but the bubble stability deteriorates causing vibration and material loss

Engineering Contradiction:

Improvediameter change speedVSAvoidbubble stability

Core Design Contradiction:

SpeedVSStability of the object's composition

Solution Approach 1:

The control device calculates and sets the gas supply/exhaust amount difference in advance based on the current bubble diameter and target diameter, ensuring that the bubble transitions through stable intermediate states rather than making abrupt changes that would cause instability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control device continuously monitors the bubble diameter and adjusts the gas supply/exhaust amount difference in real-time based on the actual diameter change progress, preventing overshooting and maintaining bubble stability during the transition

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If the bubble diameter is changed without proper control, then the flat film width adjustment is achieved, but the instability causes increased material loss

Engineering Contradiction:

Improveflat film width adjustmentVSAvoidmaterial loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of substance

Solution Approach 1:

The control device calculates the appropriate gas supply/exhaust amount difference before initiating the diameter change, based on the current and target bubble diameters, ensuring a controlled transition that prevents material waste

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the gas supply/exhaust amount difference during the diameter change process, adapting to the bubble's real-time state to maintain stability throughout the transition and prevent material loss

Inventive Principle:

Principle #15Dynamics

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 rapid and stable changes in the bubble diameter without material loss by controlling the gas supply/exhaust to maintain bubble stability.

Implementation Method 1

a gas supply/exhaust device that supplies gas to and exhausts gas from a bubble

Methodology Applied

Scientific EffectGas pressure control: Pressure Increase

Data Source

PatentUS20250214297A1Inflation molding apparatus and control device

Publication Date: 2025.07.03 SUMITOMO HEAVY INDS MODERN

AI summary

An inflation molding apparatus includes: a gas supply/exhaust device that supplies gas to and exhausts gas from a bubble; and a control device that controls the gas supply/exhaust device, in which in a case where a diameter of the bubble is to be changed, the control device controls a gas supply/exhaust amount difference of the gas supply/exhaust device based on information on the bubble of which the diameter is not yet changed or is being changed.