Security paper is a special type of paper that has been embedded with features that make it difficult to counterfeit or alter. These features can include watermarks, security threads, microprinting, and chemical حساس (hassas, sensitive) inks.

The ink you're looking for is called thermochromic ink. It's a special type of dye that changes color based on temperature.

"Perfect perf" refers to a specific type of perforation applied to paper. Perforation is a series of tiny holes or cuts that make it easier to tear the paper cleanly in a straight line along those perforations.

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