Laser Scanning Heat Sealability Biaxially Oriented Polyester Film

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Solution Overview

Problem

Biaxially oriented polyester films are poor in heat sealability, and existing methods using short pulse electromagnetic wave irradiation are inefficient and unsafe.

Innovation Solution

Applying a laser beam while scanning to impart heat sealability to biaxially oriented polyester films, either as a single layer or in laminates, creating microstructures that enhance sealability by altering molecular orientation and crystallinity, with specific conditions for energy density and scanning parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If short pulse electromagnetic wave irradiation is used to impart heat sealability, then heat sealability is improved, but energy efficiency is poor and safety is compromised

Engineering Contradiction:

Improveheat sealabilityVSAvoidenergy efficiency

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the irradiation parameters from short high-intensity pulses to continuous low-intensity irradiation. This parameter change allows the laser beam to gradually heat and modify the polyester film surface without causing excessive energy consumption or safety issues, while still achieving the desired heat sealability improvement through molecular orientation alteration and microstructure formation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs periodic scanning motion of the laser beam across the film surface. By moving the laser beam in a scanning pattern rather than irradiating a single spot continuously, the system achieves uniform surface modification across the entire film while distributing energy input over time and space, improving both energy efficiency and operational safety.

Inventive Principle:

Principle #19Periodic action

2Reliability

If short pulse electromagnetic wave irradiation is used to impart heat sealability, then heat sealability is improved, but operational safety is compromised

Engineering Contradiction:

Improveheat sealabilityVSAvoidsafety

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the irradiation parameters from short high-intensity pulses to continuous low-intensity irradiation. This parameter change reduces the peak energy density that could cause sudden film degradation, melting, or operator exposure hazards, while still achieving the desired heat sealability improvement through controlled molecular orientation alteration and microstructure formation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses rapid scanning motion of the laser beam to quickly move across the film surface, limiting the time any single location is exposed to high energy density. This skipping approach prevents localized overheating and associated safety issues while still achieving comprehensive surface modification for heat sealability.

Inventive Principle:

Principle #21Skipping (Rushing through)

3Use of energy by moving object

If laser beam scanning is applied to impart heat sealability, then energy efficiency is improved and safety is enhanced, but manufacturing precision must be optimized

Engineering Contradiction:

Improveenergy efficiencyVSAvoidseal strength uniformity

Core Design Contradiction:

Use of energy by moving objectVSManufacturing precision

Solution Approach 1:

The patent implements feedback control through precise control of the laser beam scanning parameters (speed, power, pattern) based on the desired heat sealability outcome. By monitoring and adjusting these parameters, the system maintains consistent energy input across the film surface, ensuring uniform molecular orientation changes and microstructure formation, which directly translates to uniform seal strength and high manufacturing precision.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent employs dynamic scanning motion of the laser beam rather than static irradiation. The scanning speed, pattern, and laser power are dynamically adjusted to ensure uniform energy distribution across the film surface. This dynamic approach allows real-time compensation for variations in film properties or environmental conditions, maintaining manufacturing precision while improving energy efficiency through optimized irradiation timing and location.

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

This method efficiently and safely imparts heat sealability to the films, enabling the production of packaging containers with improved seal strength and uniformity, overcoming the limitations of previous technologies.

Implementation Method 1

applying a laser beam while scanning to impart heat sealability to biaxially oriented polyester films

Methodology Applied

Scientific EffectLaser heating: Laser

Implementation Method 2

irradiating a laser beam under scanning to a given region of a film

Methodology Applied

Scientific EffectElectromagnetic radiation absorption: Absorption (EM radiation)

Data Source

PatentUS10808092B2Method for imparting heat sealability to a biaxially oriented polyester film, and method for producing a packaging container

Publication Date: 2020.10.20 TOPPAN HOLDINGS INC

AI summary

A method of imparting heat sealability includes applying a laser beam to a region on a surface of a film while scanning the region with the laser beam such that heat sealability is imparted to the region. The film is a single layer of a biaxially oriented polyester or a laminate having a biaxially oriented polyester layer on one or more surfaces.