Flexible Packaging Material Ink Cross-Linking
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Solution Overview
Problem
Current flexible packaging materials require large quantities of costly and time-consuming white electrostatic inks for reverse printing, and they struggle to maintain high lamination bond strength while reducing the need for these inks.
Innovation Solution
A process for preparing flexible packaging material involves printing a first thermoplastic resin onto a flexible substrate, depositing a composition containing a cross-linker, white pigment, and a second thermoplastic resin, and laminating the substrates to cross-link the first thermoplastic resin and enhance bond strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large quantities of white electrostatic inks are used for reverse printing, then the packaging material achieves adequate coverage and appearance, but the production cost increases and production time is extended
Solution Approach 1:
The invention changes the fundamental parameter of the printing system by replacing electrostatic ink deposition with direct thermal or inkjet printing methods. This allows the use of conventional inks that do not require electrostatic charging, thereby eliminating the need for large quantities of white electrostatic inks while reducing both cost and production time
Solution Approach 2:
The invention extracts and removes the white electrostatic ink layer from the multi-layer printing process. By printing the design directly onto the packaging material without requiring a white base layer for color accuracy, the process eliminates material waste and reduces production steps
2Productivity
If the quantity of white electrostatic inks is reduced, then production cost and time are reduced, but lamination bond strength deteriorates
Solution Approach 1:
The invention introduces a primer layer as an intermediary between the packaging material and the printed design. This primer layer provides the necessary adhesive properties to ensure strong lamination bond strength, replacing the functional role previously fulfilled by white electrostatic inks without requiring their presence
Solution Approach 2:
The invention changes the chemical and physical parameters of the bonding interface by using primers with specific adhesive properties. This allows achieving strong lamination bonds through chemical adhesion rather than relying on the mechanical interlocking provided by white ink layers
3Manufacturing precision
If white electrostatic inks are used extensively, then adequate coverage and opacity are achieved, but material cost increases
Solution Approach 1:
The invention extracts and eliminates the white electrostatic ink from the printing system entirely. By using direct printing methods on transparent or colored packaging materials, the process achieves adequate coverage without consuming large quantities of white ink, thereby reducing material cost
Solution Approach 2:
The invention applies printing only where the design is needed rather than applying white ink uniformly across the entire packaging surface. This localized approach achieves adequate coverage for the design elements while minimizing ink consumption and cost
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 reduces the requirement for white electrostatic inks while maintaining high lamination bond strength, ensuring the flexibility and durability of the packaging material.
Implementation Method 1
depositing a cross-linking composition comprising a cross-linker onto the printed ink composition such that the thermoplastic resin of the ink composition is crosslinked
Implementation Method 2
laminating the first flexible substrate with a second flexible substrate such that the ink composition and the cross-linker are disposed between the first and second flexible substrates
Data Source
Figure 1
AI summary
Described herein is a process for preparing a flexible packaging material. The process may comprise: providing a printed first flexible substrate comprising an ink composition on a surface of a first flexible substrate, the ink composition comprising a first thermoplastic resin; depositing a further composition comprising a cross-linker, a white pigment and a second thermoplastic resin onto the printed ink composition such that the thermoplastic resin of the ink composition is cross-linked; and laminating the first flexible substrate with a second flexible substrate such that the ink composition, the further composition and the cross-linker are disposed between the first and second flexible substrates.