Liquid Electrophotographic Ink for Flexible Packaging
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Solution Overview
Problem
Liquid electrophotographic printing on flexible packaging substrates faces challenges with durability, requiring heat-sealing resistance, water resistance, and mechanical resistance, which existing methods struggle to maintain through the product's life cycle, often necessitating the use of primers and varnishes that increase costs and complexity.
Innovation Solution
Incorporating a first thermoplastic resin with a copolymer comprising an alkylene monomer and a monomer with an epoxide group, and a second thermoplastic resin with a copolymer containing a monomer with an anhydride group in the liquid electrophotographic ink, which reduces damage during heat-sealing and allows for the removal of primers and varnishes, thereby simplifying the printing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing liquid electrophotographic printing methods are used on flexible packaging substrates, then printing can be performed, but heat-sealing resistance, water resistance, and mechanical resistance are insufficient, requiring additional primers and varnishes
Solution Approach 1:
The patent uses a composite ink formulation containing both acrylic resin and epoxy resin. The acrylic resin provides adhesion to the substrate, while the epoxy resin provides cross-linking capability for enhanced heat-sealing resistance, water resistance, and mechanical resistance. This composite material approach eliminates the need for separate primer and varnish layers.
Solution Approach 2:
The patent modifies the chemical composition parameters of the liquid electrophotographic ink by incorporating specific ratios of acrylic resin (5-50 wt%) and epoxy resin (5-50 wt%). This parameter change enables the ink to achieve sufficient durability properties directly, eliminating the need for additional protective layers.
2Reliability
If primers and varnishes are applied to enhance durability, then heat-sealing resistance and mechanical resistance improve, but manufacturing costs and process complexity increase
Solution Approach 1:
The patent merges the functions of primer and varnish into a single liquid electrophotographic ink formulation. The ink simultaneously provides adhesion (primer function) and protective properties like heat-sealing resistance and water resistance (varnish function) through its composite resin composition, thereby reducing material costs and simplifying the manufacturing process.
Solution Approach 2:
The liquid electrophotographic ink is designed to perform multiple functions: it adheres to the substrate (primer function), provides heat-sealing resistance, offers water resistance, and delivers mechanical resistance. This multi-functional ink eliminates the need for separate primer and varnish applications, reducing both material and processing costs.
3Reliability
If primers and varnishes are used to ensure durability, then print quality is maintained, but printing time and production efficiency decrease
Solution Approach 1:
The patent extracts and eliminates the separate primer and varnish steps from the printing process by incorporating their functional properties directly into the liquid electrophotographic ink formulation. This reduces the number of processing steps and accelerates production while maintaining mechanical resistance and overall print quality.
Solution Approach 2:
The durability properties (heat-sealing resistance, water resistance, mechanical resistance) are built into the ink formulation before printing occurs. This preliminary incorporation of protective properties eliminates the need for subsequent primer and varnish applications, thereby improving printing efficiency and production speed.
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 solution enhances the heat-sealing resistance and durability of printed images, allowing for the elimination of primers and varnishes, resulting in cost savings and improved printing efficiency without compromising print quality.
Implementation Method 1
a first thermoplastic resin comprising a copolymer comprising an alkylene monomer and a monomer comprising an epoxide group, and a second thermoplastic resin comprising a copolymer comprising a monomer comprising an anhydride group
Implementation Method 2
The charged particles adhere to the image areas of the latent image while the background areas remain clean
Data Source
AI summary
Described herein is a liquid electrophotographic ink composition comprising a first thermoplastic resin comprising a copolymer comprising an alkylene monomer and a monomer comprising an epoxide group, and a second thermoplastic resin comprising a copolymer comprising a monomer comprising an anhydride group.