Ink Composition Reducing Offset and Sticking
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Solution Overview
Problem
Offset and sticking issues in offset printing due to delayed drying of ink compositions, particularly exacerbated by reduced petroleum solvent content and use of plant-based oils, lead to adhesion problems and decreased productivity, with existing solutions either being environmentally unfriendly or requiring additional equipment.
Innovation Solution
The development of an ink composition incorporating a (meth)acrylic resin with a high glass transition temperature and weight-average molecular weight, combined with spherical particles, which enhances drying speed and reduces viscosity variation, thereby minimizing offset and sticking while eliminating the need for powder sprays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the content of petroleum solvent is reduced or eliminated, then environmental safety is improved, but the drying speed of ink is delayed and offset/sticking occurs
Solution Approach 1:
The invention changes the chemical composition parameters of the binder resin, specifically using a resin with a glass transition temperature of 60°C or higher and a number-average molecular weight of 10,000 or more. This parameter change allows the ink to maintain adequate viscosity and drying performance even with reduced petroleum solvent content, resolving the contradiction between environmental safety and drying speed.
Solution Approach 2:
The invention creates a composite ink formulation combining the specific binder resin with drying oil and controlled petroleum solvent content. This composite material approach allows the system to achieve both reduced solvent content for environmental safety and maintained drying speed through the synergistic effects of the resin-drying oil-solvent combination.
2Object-affected harmful factors
If drying oil content is increased to replace petroleum solvent, then environmental safety is improved, but permeation into printing paper is delayed and offset occurs
Solution Approach 1:
The invention optimizes the molecular weight parameter of the binder resin (10,000 or more) to control the rheological properties of the ink. This parameter adjustment enables the ink to maintain appropriate viscosity for paper permeation while containing higher drying oil content, thus reducing permeation time despite increased oil content.
3Reliability
If powder is scattered over printing paper to avoid offset and blocking, then offset and blocking are prevented, but work environment degrades and production efficiency lowers
Solution Approach 1:
The invention extracts and eliminates the need for powder application by addressing the root cause of offset and blocking through improved ink formulation. By using the specific binder resin with high glass transition temperature and molecular weight, the ink inherently resists offset and blocking without requiring external powder additives, thereby maintaining production efficiency.
Solution Approach 2:
The ink formulation becomes self-sufficient in preventing offset and blocking through its inherent rheological properties provided by the specific binder resin. The resin's high glass transition temperature and molecular weight enable the ink to self-regulate its viscosity and adhesion characteristics, eliminating the need for external powder applications and improving production efficiency.
4Reliability
If powder is scattered over printing paper to avoid offset and blocking, then offset and blocking are prevented, but cleaning cycles are shortened
Solution Approach 1:
The invention removes the requirement for powder application by incorporating preventive properties directly into the ink formulation. The specific binder resin with high glass transition temperature and molecular weight prevents offset and blocking at the source, eliminating the need for powder-based solutions that would require frequent cleaning and thereby extending cleaning cycle duration.
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 ink composition significantly reduces offset and sticking, improves drying speed, and enhances productivity without requiring new equipment or environmental hazards, maintaining print quality and reducing powder usage.
Implementation Method 1
containing a (meth)acrylic resin: (1) containing at least 60% by weight or more of a structural unit derived from (meth)acryl monomer having a cyclic alkyl group having 4 or more carbon atoms; (2) having a glass transition temperature of 63°C to 180°C; and (3) having a weight-average molecular weight of 1,000 to 80,000
Implementation Method 2
allowing the residual components which remain on the surface of the printing paper to be oxidized by aerial in the air 3, polymerized and dried, to thereby form a solid coating on the surface of the printing paper
Implementation Method 3
allowing the petroleum solvent 1 contained in the ink composition for offset printing to permeate into the printing paper 2
Data Source
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AI summary
Provided is an ink composition less likely to cause offset and sticking. Provided is a printed matter and a printing method using such ink composition. The ink composition includes a (meth)acrylic resin and a drying oil, the (meth)acrylic resin: containing at least 40% by weight or more of a structural unit derived from (meth) acryl monomer having a straight-chain alkyl group having 4 or more carbon atoms, branched alkyl group having 4 or more carbon atoms, or cyclic alkyl group having 4 or more carbon atoms (1); having a glass transition temperature of 63°C to 180°C (2) ; and having a weight-average molecular weight of 1000 to 80,000 (3).