In the stationery manufacturing industry, the quality of the "ruling" (the lines and grids on a page) defines the quality of the brand. At Cheung Wo Hing (CWH), we utilize Flexographic (Flexo) Printing to achieve the industry's highest production speeds without compromising on line clarity.

This guide explains how flexo technology works and why it is the engine behind the world’s most efficient exercise book factories.

1. What is Flexo Printing? 

To understand flexo printing, imagine a rubber stamp attached to a high-speed rotating cylinder. It is a "relief" printing process, meaning the image you want to print—such as a notebook grid or margin—is raised above the surface of the printing plate.

The Two Essential Components

To produce a high-quality exercise book, the flexo process relies on two specific "ingredients":

A. The Flexo Printing Plate

We use flexible photopolymer plates. These are wrap-around "molds" that hold the design of your ruling.

• Why it’s beginner-friendly: Unlike heavy metal plates, these are light and easy to swap.

• The Benefit: They are incredibly durable. A single plate can print millions of exercise books, ensuring the ruling in the first book of the day is identical to the last.

B. Water-Based Ink

• Technical Edge: Because our machines, like the AFPC-1040, run at speeds of 300–350 meters per minute, the ink must dry instantly. Water-based ink is designed to be absorbed by the paper fibers immediately, preventing smudging or "ghosting" during high-speed cutting.

2. Why Do Exercise Book Machines Use Flexo Printing?

If you are setting up a factory, you might wonder why we don't use "Offset" or "Digital" printing. Here is why Flexo is the superior choice for stationery:

Reason 1: Extreme Operational Speed

Flexo is a rotary process. Because the cylinders spin continuously, there is no "start-stop" motion. This allows our Fully Automatic Reel-to-Pack lines to convert a massive roll of paper into finished, stitched, and cut notebooks in one seamless flow.

Reason 2: Optimized for Paper Absorbency

The paper used for exercise books is often porous. Flexo plates use a "light touch". This transfers the perfect amount of ink to the surface without it bleeding through to the other side of the page.

Reason 3: Cost-Efficiency at Scale

While there is a small initial cost to create the printing plate, the "cost-per-page" of flexo printing is the lowest in the world for high-volume production. It is the most profitable method for manufacturers targeting large-scale school or government tenders.

Quick Summary for Factory Planning

Frequently Asked Questions

Q: Can I print different colors of lines?

A: Yes. By changing the water-based ink in the fountain, you can print standard blue lines, red margins, or grey grids.

Q: Is it easy to maintain?

A: Our machines feature easy-access ink fountains and steel anilox rollers, which are designed for easy cleaning and long-term industrial use.