What is Flexo printing process? | Keshenglong&Shinko Guide

What is the Flexo Printing Process?

This article clarifies the flexo printing process, addressing common questions and challenges faced by professionals in the field. We break down the key steps, highlighting best practices for optimal results.

The Flexo Printing Process: A Step-by-Step Guide

* Plate Making: This crucial initial step involves creating a flexible printing plate from a digital design. Common methods include photopolymer plate making, which uses UV exposure to harden photopolymer material according to the image.

* Plate Mounting: The accurately produced flexographic printing plate is carefully mounted onto a printing cylinder. Precise registration is essential for accurate color alignment.

* Ink Transfer: Flexo printing uses a raised image on the plate. Ink is transferred from the ink fountain to the plate and then to the substrate (e.g., film, paper, or flexible packaging). The anilox roll plays a critical role in controlling ink volume.

* Printing Press Operation: The substrate is fed through the press, where the inked plate transfers the image. The pressure exerted is carefully controlled; excessive pressure may cause distortion. Modern presses often incorporate features like automated register control and closed-loop systems for ink density management.

* Drying: Depending on the ink type (water-based, UV-curable, or solvent-based), different drying methods are used. UV curing is common for high-speed production, offering instant drying.

* Post-Printing Processes: These can include slitting, rewinding, and inspection. Quality control at this stage is critical to ensuring the final product meets specifications.

Key Considerations for Optimizing Flexo Printing

* Anilox Roll Selection: The choice of anilox roll (cell count, volume) directly impacts ink transfer and print quality. Selecting the appropriate anilox roll for specific substrates and ink viscosities is essential.

* Ink Viscosity: Maintaining optimal ink viscosity is critical for consistent ink transfer and print quality. Incorrect viscosity can lead to print defects.

* Substrate Selection: The type of substrate greatly affects the printing process. Different substrates require adjustments in pressure, ink, and drying techniques.

* Press Maintenance: Regular maintenance of the printing press is crucial to prevent downtime and maintain print quality.

Advancements in Flexo Printing Technology

* Digital Flexo: Digital plate making processes enhance efficiency and reduce waste compared to traditional analog methods.

* HD Flexo: High-definition flexo printing utilizes advanced platemaking and printing technologies to achieve higher resolution and finer detail.

* Narrow Web Flexo: This technique is ideal for smaller-scale and specialized printing applications.

By understanding and mastering these aspects, flexo printers can improve efficiency, reduce waste, and enhance the overall quality of their output. Keshenglong&Shinko is committed to providing innovative solutions to support professionals in the flexographic printing industry.