Multilayer Polycarbonate Structure for Fast Lamination Without Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The lamination of polymer films often results in air inclusions and deformations due to material incompatibility and the need for rapid, efficient, and flexible production of long-lasting laminates, particularly in the context of security documents.
Innovation Solution
A multilayer construction comprising a first polymer layer with a Vicat softening temperature of ≥149°C, a second layer with a Vicat softening temperature of <149°C, and optionally a third layer with ≥149°C, using polycarbonates or copolycarbonates, which allows for rapid and cost-effective production while minimizing deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymer films with high Vicat softening temperature (≥149°C) are used for lamination, then the durability and heat resistance of the laminate is improved, but the lamination process becomes more difficult and time-consuming due to higher processing temperatures required
Solution Approach 1:
The patent changes the chemical composition parameters of the polymer layers, specifically using polycarbonate or copolycarbonate with controlled molecular weight and composition to achieve both high Vicat softening temperature (≥149°C) for durability and appropriate melt flow characteristics for rapid lamination processing
Solution Approach 2:
The patent employs composite material structures including multilayer configurations where at least one layer consists of polycarbonate or copolycarbonate combined with other polymers, creating a composite that simultaneously provides high-temperature stability for durability and optimized rheological properties for fast processing
2Adaptability or versatility
If different polymer materials are used to achieve material flexibility and variety in laminate composition, then the adaptability and design freedom is improved, but air inclusions and deformations increase due to material incompatibility
Solution Approach 1:
The patent applies homogeneity by ensuring that when multiple polymer materials are used, they are carefully selected and processed to achieve uniform mixing and compatible interfacial properties, minimizing phase separation and air inclusion formation while maintaining material variety for design flexibility
Solution Approach 2:
The patent uses intermediary layers or surface treatments between incompatible polymer materials to facilitate bonding and prevent air inclusions, acting as a mediator that allows diverse material combinations while maintaining laminate quality and eliminating defects
3Productivity
If rapid lamination processing is implemented to increase production speed, then the productivity is improved, but deformations and manufacturing defects increase due to insufficient processing time and temperature control
Solution Approach 1:
The patent applies preliminary action by pre-heating polymer layers to optimal temperatures before lamination and pre-cooling substrates to facilitate rapid bonding, allowing high-speed processing while maintaining sufficient thermal conditions for defect-free laminate formation
Solution Approach 2:
The patent employs periodic action through rapidly alternating heating and cooling cycles during lamination processing, enabling quick temperature adjustments that achieve complete bonding in short time while preventing thermal deformations through controlled thermal stress management
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 multilayer construction achieves high adhesion, transparency, and durability with enhanced sharpness and resolution, suitable for security documents, while maintaining planarity and chemical resistance.
Implementation Method 1
a first polymer layer (S1), which comprises ≥95% by weight, preferably ≥98% by weight, particularly preferably ≥99% by weight, based on the total weight of the polymer layer (S1), of a polymer (P1) which is selected from the group consisting of a polycarbonate, a copolycarbonate or mixtures of these and has a Vicat softening temperature of ≥149° C.
Data Source
AI summary
The invention relates to a multilayer structure (MS) comprising (SI) at least one first polymer layer (SI) comprising ≥95% by weight, preferably ≥98% by weight, particularly preferably ≥99% by weight, based on the total weight of the polymer layer (SI), of a polymer (PI) selected from the group consisting of a polycarbonate, a co-polycarbonate or mixtures thereof having a Vicat softening temperature≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 360:2004 (50N; 50°/h); (S2) at least one further polymer layer (S2) having a Vicat softening temperature<149° C., preferably ≥140° C., more preferably ≤130° C., determined according to ISO 306:2004 (50N; 50°/h), preferably in a range from 120° C. to 148° C.; (S3) optionally at least one third polymer layer (S3) having a Vicat softening temperature≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 306:2004 (50N; 50° h). The invention further relates to a process for producing a multilayer structure (MS) and to a security document comprising such a multilayer structure according to the invention.