Polyurethane Printing Ink for Nonwoven Rub Resistance
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Solution Overview
Problem
Existing inks used for printing on non-woven substrates, such as those in incontinence products, lack enhanced color transfer resistance, causing ink to easily transfer onto contact surfaces like clothing and furniture, which is a concern for both decoration and utility purposes.
Innovation Solution
A printing ink composition comprising organic solvent, colorant, and a semi-aliphatic polyurethane resin derived from a mixture of aliphatic and aromatic isocyanates, with optional nitrocellulose resin, providing a rub rating of at least 6, which is designed to maintain colorfastness and resist transfer when printed on non-woven substrates like polyethylene or polypropylene films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flexographic or rotogravure printing inks are used on nonwoven substrates, then the printing process is simple and cost-effective, but the printed ink has low color transfer resistance and easily transfers onto contact substrates
Solution Approach 1:
The patent applies composite materials by combining multiple resin components (polyester resin, acrylic resin, and vinyl resin) in specific proportions to create an ink formulation that achieves enhanced color transfer resistance on nonwoven substrates while maintaining compatibility with conventional flexographic and rotogravure printing processes
Solution Approach 2:
The patent applies parameter changes by optimizing the molecular weight ranges, resin ratio proportions, and solvent composition of the ink formulation to achieve the desired balance between color transfer resistance and printing processability on nonwoven substrates
2Reliability
If the nonwoven substrate is printed with conventional inks, then the printing process is straightforward, but the printed graphics discolor anything the nonwoven substrate may come into contact with such as clothing, carpet and furniture
Solution Approach 1:
The patent uses a composite resin system consisting of polyester resin (30-70 parts), acrylic resin (10-40 parts), and vinyl resin (10-40 parts) in specific proportions to achieve enhanced colorfastness while maintaining compatibility with existing printing processes, avoiding the need for process redesign
Data Source
AI summary
A flexographic and/or rotogravure printing ink used on non-woven substrates contains polyurethane resin, solvent, and colorant.