Carbonless copy paper is generally two-linked, divided into upper paper and lower paper. The front of the upper paper contacts the front of the middle paper, and the front of the lower paper can be copied, but two upper papers or two lower papers can't produce copying effect, because there are chemical molecules used for copying on the back of the upper paper, the front and back of the middle paper and the front surface of the lower paper. Carbonless carbon paper is mostly used in documents, and the existing official documents with legal effect such as invoices, contracts and treaties have been used. Such as: postal service (sealed postal bill, delivery postal waybill), bank (bank settlement voucher, bank POS bill), medical service (medical receipt bill, charge receipt, prescription bill, drug sales bill, drug receipt and delivery bill), hotel (hotel bill), energy (water, electricity and coal charge bill, water and electricity reminder bill, gas security check bill), concrete (electronic scale bill, delivery bill) Printing of punched forms in logistics (logistics waybill), electronic appliances (product warranty card), hardware (hardware processing sheet), jewelry (jewelry quality guarantee) and other industries.
Double offset paper usually refers to printing paper, also known as offset paper. It used to be called Doric paper/Doric paper. It has the characteristics of small flexibility, good flatness and strong water resistance. Under normal circumstances, the basis weight of double offset paper is between 60- 120g, which is also a high basis weight double offset paper of 150g or more. The most widely used double-sided adhesive paper is 70- 120g. Less than 60g is called writing paper instead of double-sided adhesive paper, and the kind of paper is poor.
Double-sided tape is widely used, mainly for making all kinds of books. It can also be used in magazines, periodicals, publicity colorful pages, catalogs, maps, calendars, covers, inserts, illustrations, product manuals, manuals, cartoons, cute cartoon books, advertising posters, corporate brochure, advertising leaflets, envelopes, books, notebooks and their dyeing and embossing, tables, corporate offices/official documents, business cards, color trademarks, etc.