Food-Grade Offset Printing Ink for Direct Food Contact
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Solution Overview
Problem
Offset printing inks and varnishes used for food packaging pose a risk of contamination due to potentially harmful components that can migrate from the packaging to the food, limiting their use to the outside of packaging and preventing direct contact with food.
Innovation Solution
Development of offset printing inks and varnishes comprising food-grade components, including approved food additives and natural resins, solvents, and colorants, ensuring all components are safe for human consumption and non-harmful, allowing for direct contact with food.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional offset printing inks and varnishes are used, then printing quality and durability are improved, but health safety deteriorates due to harmful components migrating to food
Solution Approach 1:
The patent applies parameter changes by completely replacing the chemical composition parameters of the ink system. Conventional inks use petrochemical solvents, synthetic resins, and pigments; the invention transitions to food-grade parameters including vegetable oil-based solvents, natural resin binders, and approved food colorants. This parameter transformation maintains printing functionality while eliminating harmful migration to food
Solution Approach 2:
The invention uses composite materials by combining multiple food-grade components into a functional printing ink system. The composition integrates vegetable oil solvents (e.g., rapeseed oil, sunflower oil), natural resin binders (e.g., shellac, rosin), and food-approved colorants into a composite material that achieves both safety and printing performance requirements
2Object-affected harmful factors
If food-grade components are used in printing inks, then health safety is improved, but printing performance and rheological properties deteriorate
Solution Approach 1:
The patent optimizes rheological parameters by adjusting the molecular weight and composition of vegetable oil-based solvents and natural resin binders. By controlling viscosity, drying time, and film formation parameters within specific ranges, the ink achieves both food safety and adequate printing performance on packaging materials
Solution Approach 2:
The invention applies local quality by tailoring the ink composition to specific printing applications and substrate types. Different formulations are developed for different packaging materials (cardboard, paper, plastic films), optimizing the balance between food safety and printing performance for each specific use case
3Speed
If solvents with high volatility are used, then drying speed is improved, but migration to food worsens
Solution Approach 1:
The patent changes the volatility parameter by using vegetable oil-based solvents with controlled evaporation rates. These solvents have intermediate volatility - not as fast as conventional petrochemical solvents but sufficient for practical drying times. The composition enables oxidative crosslinking and absorption drying mechanisms that achieve film formation without excessive solvent migration to food
Solution Approach 2:
The invention converts the potential harm of solvent migration into a benefit by using food-grade vegetable oil solvents. Even if these solvents migrate to food contact surfaces, they are non-toxic and safe for consumption, transforming the migration issue from a harmful effect into a benign or beneficial outcome
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 use of food-grade components in offset printing inks and varnishes enables safe printing on the inside of food packaging and direct application to food surfaces, ensuring the printed products are harmless and meet the required rheological and printing properties.
Implementation Method 1
the binder or binders in turn comprise one or more resin components and a solvent which dissolves the resin components in the printing ink or the printing varnish and reduces the viscosity
Implementation Method 2
the solvent allowing physical and/or chemical drying of the printing ink or the printing process after the printing process Printing varnish is made possible by, for example, evaporating
Implementation Method 3
the solvent allowing physical and/or chemical drying of the printing ink or the printing process after the printing process Printing varnish is made possible by, for example, being absorbed by the printing material
Implementation Method 4
one or more binders, which bind the colorants to the surface of the printing material to form a film
Data Source
AI summary
The invention relates to an offset printing ink or an offset printing varnish that is suitable for direct contact with foods, comprising at least one binder and optionally at least one colorant, wherein all components of the offset printing ink or the offset printing varnish are either foods in the sense of Regulation (EC) No 178/2002 of the European Parliament and of the Council or food additives in the sense of Regulation (EC) No 1333/2008 of the European Parliament and of the Council.