Flexographic printing represents the benchmark technology for applying functional and branding graphics to embossed spunbond non-wovens directly along the converting line. Its core strength lies in the distinctive combination of high mechanical adaptability and compatibility with specialized ink systems, enabling seamless customization based on the specific needs of consumer, medical, and industrial sectors.
Core flexographic advantages for non-woven substrates
Regardless of the final product’s end use, two structural advantages make flexography the optimal solution:
Direct Inline integration:
For large-scale production, operational efficiency is essential. Inline flexographic presses are engineered with a compact vertical footprint, allowing straightforward and cost-effective integration directly into the converting line. This single-pass process (from web formation, to embossing, to printing) eliminates costly secondary operations, reduces material handling, and significantly boosts productivity.
Printing on irregular surfaces:
The embossed structure of spunbond materials presents substantial printing challenges. Flexography addresses these effectively through the use of soft, flexible photopolymer plates, which adapt precisely to the material’s surface irregularities. This allows for a light yet accurate impression, ensuring uniform ink transfer to both raised and recessed areas of the design.
Selecting the right ink system
Flexography demonstrates its full versatility through the careful selection of the most suitable ink system for the specific application. The choice between water-based and solvent-based inks depends entirely on the performance requirements of the end product.
Hygiene and Medical applications (diapers, sanitary pads, medical garments): focus on safety, softness and comfort.
Why choose water-based inks:
These inks use water as the primary solvent. Instead of forming a film on the material’s surface, they absorb slightly into the fabric and tint the fibers. This is essential for preserving the softness and hand-feel of the substrate. The print becomes an integral part of the material, avoiding the formation of rough layers that could irritate the skin. Additionally, water-based inks are non-toxic and contain very low levels of Volatile Organic Compounds (VOCs), fully meeting stringent hygiene and safety regulations.
Technical applications (house wraps, roofing underlayments, geotextiles): focus on durability and resistance.
Why choose solvent-based inks:
Polypropylene inherently has a low-energy surface, making ink adhesion difficult. Solvent-based inks contain active agents that gently etch the surface of the fibers, creating a strong mechanical bond. The result is a print that is exceptionally resistant to abrasion, scratching, moisture, and weather exposure, even under harsh environmental conditions. While preserving the material’s required flexibility, this ink system ensures that branding and technical markings remain legible and intact for the entire lifespan of the product.
Written by Annalisa P. | Team Giugni®
