Antibacterial Finishing Composition for Printed Substrates
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Solution Overview
Problem
Current methods for reducing cross-infection through document handling are inadequate, as antibacterial impregnated papers and inks are either costly or ineffective in protecting the entire surface of printed matter, leaving significant areas unprotected.
Innovation Solution
A method involving the application of a continuous outer protective layer with antibacterial silver ions, using a finishing composition that includes silver ions and an adhesion agent, applied via a roller to create a durable and long-lasting antibacterial surface on printed substrates, ensuring the entire surface is protected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antibacterial impregnated papers are used, then antibacterial protection is provided, but the cost increases and only the surface is protected while the bulk remains ineffective
Solution Approach 1:
The invention extracts the antibacterial function from the bulk paper material and concentrates it in a thin surface coating layer. This is achieved by applying a finishing composition containing antibacterial agents (such as silver ions) that forms a protective layer only where needed - on the surface that contacts users - thereby eliminating the waste of impregnating the entire bulk of the paper with expensive antibacterial agents.
Solution Approach 2:
The invention applies antibacterial protection locally only to the surface layer of the paper that comes into contact with users, rather than uniformly throughout the entire paper structure. This localized application is achieved through a finishing composition that deposits antibacterial agents specifically on the surface, providing effective protection where it is needed while reducing material costs.
2Reliability
If antibacterial impregnated inks are used, then some surface protection is provided, but coverage is incomplete and larger portions of the paper remain unprotected
Solution Approach 1:
The finishing composition serves multiple functions: it provides antibacterial protection, enhances print quality, and ensures complete surface coverage. Unlike antibacterial inks that only protect printed areas, the finishing composition is applied across the entire surface of the paper including unprinted regions, thereby providing universal protection across the whole document surface.
3Object-affected harmful factors
If documents are cleaned regularly, then cross-infection risk is reduced, but the documents may be damaged by cleaning processes
Solution Approach 1:
The invention applies antibacterial agents in advance during the finishing process, creating a protective layer that prevents bacterial adhesion and growth before contamination can occur. This preliminary protective action eliminates the need for subsequent cleaning of the documents, as the antibacterial coating passively prevents cross-infection without requiring physical or chemical cleaning that could damage the document.
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 solution significantly reduces the risk of cross-infection by creating a continuous antibacterial layer that covers the entire surface of printed matter, meeting or exceeding antibacterial activity requirements for MRSA and E.coli, as tested by JIS Z2801/ISO22196:2007 standards.
Implementation Method 1
a finishing composition comprising the antibacterial additive is applied to a transfer surface; and the finishing composition is transferred from the transfer surface to the substrate to form the continuous outer protective layer
Data Source
Figure 1
AI summary
A method is disclosed for applying an antibacterial coating onto a substrate (12) having one or more layers of print (28). In a printing press (10), one or more layers of print (28) are applied to a substrate (12) in a printing step. A finishing composition 36 is applied over the layers of ink (28) by a finishing (stage 16) in a finishing step to form a continuous outer protective layer. The finishing composition (36) is applied to the substrate (12) by a roller (30). The printing step and the finishing step are performed simultaneously. The finishing composition (36) comprises an antibacterial additive.