Laser-Printable Polyester Film With Uniform Thickness and Transparency
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Solution Overview
Problem
Conventional packaging films for laser printing face issues with uneven thickness, reduced transparency, and delamination problems, which affect their usability and productivity in packaging applications.
Innovation Solution
A polyester-based film with specific properties, including a laser-printable metal content between 100 ppm and 3000 ppm, a haze of 1% to 40%, and a thickness of 5 μm to 100 μm, using pigments like bismuth, gadolinium, or antimony, and a layered structure that includes a central laser printing layer and non-reactive layers for improved printability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a heat-sensitive layer is provided on the film substrate for printing, then printing capability is improved, but delamination occurs and transparency is reduced
Solution Approach 1:
The patent extracts the metal particles from separate functional layers and incorporates them directly into the polyester resin matrix during film formation. This eliminates the need for distinct printing layers that can delaminate, while maintaining laser-induced printing capability through the dispersed metal particles throughout the film structure.
Solution Approach 2:
The patent creates a composite material by incorporating metal particles (such as bismuth, gadolinium, or antimony) directly into the polyester resin during film formation. This composite structure provides both the mechanical integrity of the base film and the laser-responsive printing properties of the metal particles, eliminating delamination issues while maintaining transparency.
2Adaptability or versatility
If multiple functional layers are coated on the film, then printing and protective functions are improved, but productivity is reduced due to multiple operations
Solution Approach 1:
The patent merges the printing function and the base film structure into a single integrated layer. By incorporating metal particles directly into the polyester resin during film formation, the need for separate printing layers and protective coatings is eliminated, reducing multiple coating operations to a single film extrusion process and significantly improving productivity.
3Reliability
If metal particulate additive is kneaded into the film for laser printing, then delamination is prevented, but transparency is reduced
Solution Approach 1:
The patent applies local quality by carefully controlling the distribution and concentration of metal particles within the polyester resin. The particles are dispersed uniformly at optimal concentrations to provide sufficient laser-induced printing capability while minimizing impact on overall film transparency. Different particle sizes and distributions can be used in different regions or layers to balance printing performance and optical properties.
4Adaptability or versatility
If metal particulate additive is used for laser printing, then printing capability is improved, but unevenness in film thickness occurs during stretching
Solution Approach 1:
The patent applies preliminary action by pre-dispersing metal particles uniformly throughout the polyester resin matrix before film extrusion and stretching operations. This preliminary uniform distribution ensures that during subsequent stretching and forming processes, the particles remain evenly distributed and do not cause localized thickness variations or defects in the final film product.
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 film achieves high transparency and uniform thickness, enabling effective laser printing on packaging while reducing the risk of delamination and improving productivity.
Implementation Method 1
as display (printing) means, not only techniques in which the heat and ink cited above but also those in which lasers serve as trigger have recently become popular
Implementation Method 2
For example, Patent Reference No. 3 discloses a multilayer laminated film for laser printing in which a printing layer comprises a layer consisting of an ink composition that is capable of being printed by means of laser light. Use of this film makes it possible to cause change in color at locations irradiated by a laser
Implementation Method 3
Patent Reference No. 4 discloses an additive for laser marking that consists of bismuth oxide. Kneading this additive into a plastic makes it possible to cause change in color at locations irradiated by a laser
Implementation Method 4
this additive can be made to undergo excitation by the energy from a laser, making it possible to cause a change in the color of the plastic
Data Source
AI summary
A polyester-based film comprising at least one layer permitting printing as a result of laser irradiation; wherein not less than 100 ppm but not greater than 3000 ppm of laser-printable metal is present in all layers of the film. The film is capable of being printed in distinct fashion by a laser, excels with respect to unevenness in thickness, and is of high transparency, while at the same time provide packaging which employs such film and on which printing has been directly carried out.