Double-loop wire binding, also known as wire-o binding or twin-loop binding, is a popular binding method for documents that uses a double loop wire spine to hold the pages together. It offers a sleek and professional look, making it a good choice for presentations, reports, manuals, and other documents that need to lay flat when opened.

UV drip off varnish is a special type of coating used in the printing industry to create a unique visual effect.

Printing is the process of transferring text, images, or patterns from a master form to a receiving surface. The master form can be made of a variety of materials, including wood, metal, plastic, or even paper. The receiving surface can be paper, cloth, or another material.

UV flexo printing originated from label printing. At first, low-speed narrow web rotary printing machines were mostly used to print self-adhesive labels, and a 300W/line inch medium-pressure mercury vapor lamp was used to obtain a satisfactory curing effect.

At present, UV ink is widely respected by printing manufacturers. And UV ink is an economical and environmentally friendly ink, which is the direction of ink development in the future. The types and characteristics of UV inks are introduced below

In a paper recently published in the British journal Nature Communications, a team of Chinese scientists introduces a new method to visualize invisible inks based on metal-organic frameworks (MOFs), which can be used to protect encrypted information and achieve repeated encrypt and decode.

After the ink is dried and solidified on the substrate to form an ink layer or ink film, due to friction, ink layer not fully cured, poor adhesion, etc., it is transferred to other places through contact or scratching, causing pollution, which is called "Ink Migration".