CF Paper Coating with Crosslinked Biopolymer Nanoparticles
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Solution Overview
Problem
Carbonless copy papers face issues with ink build-up on printing units during modern offset printing, particularly in UV-curing offset printing, leading to increased cleaning efforts and reduced productivity, due to the limitations of existing binder systems in CF papers.
Innovation Solution
A CF paper is developed with a coating containing a crosslinked biopolymer material in the form of nanoparticles as the binder, which improves carbon copying performance without negatively impacting printability and reduces the proportion of organic colour developing agents, thereby preventing ink build-up on rubber blankets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional binder systems (SB latex and starch) are used in CF paper, then coating binding is achieved, but ink build-up occurs on rubber blankets during offset printing
Solution Approach 1:
The patent changes the chemical and physical parameters of the binder by using crosslinked biopolymer nanoparticles instead of conventional SB latex and starch binders. This parameter change modifies the surface properties of the coating, preventing ink build-up on rubber blankets during offset printing while maintaining adequate coating binding.
Solution Approach 2:
The patent employs a composite binder system consisting of crosslinked biopolymer nanoparticles (such as crosslinked starch or cellulose derivatives) combined with specific coating pigments and additives. This composite material approach creates a coating with optimized properties that simultaneously achieves coating binding and prevents ink build-up during printing.
2Reliability
If proportion of organic colour developing agent is increased to compensate for binder changes, then carbon copying performance is maintained, but cost increases
Solution Approach 1:
The patent changes the binder parameters to crosslinked biopolymer nanoparticles, which improves the coating's ability to release and transfer the colour developing agent during carbon copying. This parameter change in the binder system allows for reduced proportions of organic colour developing agents while maintaining effective carbon copying performance, thereby reducing costs.
3Productivity
If modern UV-curing offset printing is used, then printing speed increases, but cleaning effort and productivity decrease due to ink build-up
Solution Approach 1:
The patent modifies the coating parameters by using crosslinked biopolymer nanoparticles, which change the surface energy and ink interaction properties of the paper. This parameter change prevents ink build-up on rubber blankets during high-speed UV-curing offset printing, thereby eliminating the need for frequent cleaning and maintaining high productivity.
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 CF paper achieves excellent carbon copying performance while maintaining printability and reducing the need for excessive developer usage, enhancing productivity and cost-effectiveness in offset printing processes.
Implementation Method 1
the at least one binder comprises a crosslinked biopolymer material in the form of nanoparticles
Implementation Method 2
the colour former, which is absorbed by the second, receiving layer—the CF layer (coated front)
Implementation Method 3
This CF layer contains the developer, which reacts with the colour former and creates a carbon copy
Data Source
AI summary
The invention concerns a CF paper comprising a base paper and a coating applied thereto, said coating containing at least one binding agent, at least one ink-absorbing agent, at least one coating pigment and conventional additives, and being characterised in that the at least one binding agent comprises a cross-linked biopolymeric material in the form of nanoparticles.