Stretchable Polyester Balloon Film for Helium Leakage Reduction

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Solution Overview

Problem

Lighter than air balloons made from oriented polyester films face issues with helium gas leakage due to poor sealing strength and adhesion between the gas barrier layer and the sealing layer, leading to reduced floating time and effectiveness.

Innovation Solution

A high barrier lamination using a biaxially oriented polyester film with an amorphous copolyester skin layer, a sealant layer, and a gas barrier layer, which includes a primer and anchor layers to enhance bonding and prevent gas leakage, resulting in improved sealing strength and extended floating time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a crystallized oriented polyester film is used to provide gas barrier properties, then helium gas leakage is reduced, but sealing strength and adhesion with the sealing layer deteriorate

Engineering Contradiction:

Improvegas barrier performanceVSAvoidsealing strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent applies local quality by creating different surface characteristics in different regions of the polyester film. The gas barrier layer maintains crystalline structure for helium resistance, while the sealing surface is treated to provide enhanced adhesion. This is achieved through selective surface treatment or coating that modifies only the sealing interface properties without affecting the bulk gas barrier performance.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses an intermediary layer or treatment between the crystallized polyester film surface and the sealing layer. This intermediate layer acts as a mediator that bonds to both the crystalline film surface and the sealing material, resolving the adhesion problem caused by the highly crystallized surface while maintaining the gas barrier properties of the underlying film.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the polyester film surface is highly crystallized to improve gas barrier properties, then helium leakage is reduced, but adhesion with the gas barrier layer deteriorates

Engineering Contradiction:

Improvehelium gas barrierVSAvoidadhesion with gas barrier layer

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent segments the polyester film structure into distinct functional layers or zones: a crystalline gas barrier layer for helium resistance and a separate adhesion-promoting layer or surface treatment for bonding with the gas barrier coating. This segmentation allows each layer to optimize its specific function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies preliminary action by treating or coating the crystallized polyester film surface before applying the gas barrier layer. This preliminary surface preparation creates an adhesion-friendly interface that prevents poor bonding, while the subsequent gas barrier layer provides the helium barrier function. The preliminary treatment ensures future adhesion without affecting the crystalline gas barrier properties.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If conventional latex balloons are used, then ease of manufacture is maintained, but gas barrier properties and appearance quality deteriorate

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidgas barrier performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent employs composite materials by combining the polyester film base material with crystalline gas barrier layers and adhesion treatments. This composite structure maintains the ease of manufacture of film-based balloons while dramatically improving gas barrier performance and appearance quality compared to conventional latex. The composite approach allows standard manufacturing processes to produce superior performance products.

Inventive Principle:

Principle #40Composite materials

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

The solution significantly reduces helium gas leakage, increases the floating time of the balloons to over 20 days, and maintains their shape and buoyancy effectively.

Implementation Method 1

thin plastic films that include a gas barrier layer... reduce diffusion of lighter than air gases like helium

Methodology Applied

Scientific EffectGas barrier:

Implementation Method 2

poor adhesion with the gas barrier layer occurs due to the same reason

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 3

oriented polyester films... surface of the oriented film is highly crystallized

Methodology Applied

Scientific EffectOrientation:

Data Source

PatentUS9186593B2Stretchable and formable lighter than air balloons made from a biaxially oriented polyester film

Publication Date: 2015.11.17 TORAY PLASTICS (AMERICA) INC

AI summary

Described are stretchable and formable lighter than air balloons including a high barrier lamination. The stretchable and formable balloons stretch when overinflated instead of failing. The balloons are formed from a lamination including a polyester film with a total thickness of 4 μm to 12 μm including a biaxially oriented polyester core layer and at least one amorphous copolyester skin layer. The polyester film has an Elongation % in the transverse direction (TD) or machine direction (MD) of greater than 125%.