As early as 1700, Europe printed the first batch of labels used on medicines and fabrics as commodity identification. Therefore, strictly speaking, tags are used to mark the classification or content of your goals, such as the keywords you set for your goals, so that you and others can find and locate your goals. The labels referred to in the printing industry are mostly printed materials used to identify the relevant descriptions of their products, mostly self-adhesive on the back. But some of them are printed without glue, which can also be called labels. Adhesive labels are often called "self-adhesive labels". The problem of labeling the instrument after calibration is stipulated by the country (or its own province), and the label can clearly explain the details of the instrument after calibration. (1) tags can be divided into: 1 according to their existing forms. Physical label is a simple sign used to express the name, weight, volume, use and other information of an item. There are traditional printed labels and modern bar code printed labels. Scope of application: packaging: shipping marks, postal parcels, letter packaging, transport goods labels, envelope address labels. Electrical appliances: mobile phone internal labels, various electrical labels, notebook computer labels, mechanical and electrical product labels. Commodities: price labels, product description labels, shelf labels, bar code labels, and drug labels. Management: book label, vehicle inspection label, security label, property label. Office: document labels, document preservation labels, various items and stationery labels. Production: raw material labels, processed product labels, finished product labels and inventory management labels. Chemical industry: labeling of paint materials, packaging labeling of gasoline engine oil products and labeling of various special solvent products. Others: anti-counterfeiting labels, encryption labels, anti-theft labels. Jewelry: Jewelry tag, which is not easy to stick to goods. Clothing: clothing tag, washing label. Airport: boarding pass and luggage tag. Tickets: train tickets, coach tickets. Others: parking tickets, expressway toll tickets. 2. Network Tags (Tags) is a way of organizing Internet content and a keyword with strong relevance. It helps people to describe and classify content conveniently, so as to facilitate retrieval and sharing. Tags have become an important element of web 2.0. Tags delegate the right to organize content from the webmaster to users, which fully embodies the bottom-up and user participation characteristics of web2.0. If you have visited web2.0 websites such as Flickr (pictures) and Technorati (blogs), you will find that websites use tags to display content, and users use tags to describe content and retrieve related content. The "open classification" used by Baidu Encyclopedia is also a manifestation of labels. 3. Electronic tags Electronic tags are also called radio frequency tags, transponders and data carriers; Readers are also called reading devices, scanners, reading heads, communicators and readers (depending on whether electronic tags can rewrite data wirelessly). Spatial (non-contact) coupling of radio frequency signals between the electronic tag and the reader is realized by coupling elements; In the coupling channel, energy transfer and data exchange are realized according to the time sequence relationship. Electronic tag is a tool to improve the efficiency and accuracy of identification, and this technology will completely replace bar code. RFID radio frequency identification is a non-contact automatic identification technology, which can automatically identify the target object and obtain relevant data through radio frequency signals, and can work in various harsh environments without manual intervention. RFID technology can identify high-speed moving objects and multiple tags at the same time, which is quick and convenient to operate. RFID tag is a breakthrough technology: "First, it can identify a single very specific object, instead of only identifying one type of object like bar code;": Secondly, it uses radio frequency, which can read data through external materials, while barcode must rely on laser to read information; Third, multiple objects can be read at the same time, while barcodes can only be read one by one. In addition, the amount of information stored is also very large. " Labels can be divided into ordinary labels and self-adhesive labels according to whether they are glued or not, among which self-adhesive labels are the most common and mainly include the following categories. 1. Calendered writing paper, offset paper label multi-purpose label paper, used for information labels and bar code printing labels, especially suitable for high-speed laser printing and inkjet printing. 2. Coated paper self-adhesive label Multi-color product label Universal label paper is suitable for information labels of medicines, food, edible oil, wine, beverages, electrical appliances and stationery. 3. Mirror coated paper self-adhesive label is a high-gloss label paper for advanced multi-color product labels, and is suitable for information labels of medicines, food, edible oil, wine, beverages, electrical appliances, stationery, etc. 4. Aluminum foil self-adhesive label Multi-color product label Universal label paper is suitable for high-grade information labels such as medicines, food and stationery. 5. Laser film self-adhesive label multi-color product label universal label paper is suitable for high-grade information labels such as stationery and decorations. 6. Fragile paper self-adhesive labels are used as anti-counterfeiting labels for electrical appliances, mobile phones, medicines, foods, etc. After peeling off the self-adhesive label, the label paper will be damaged immediately and cannot be reused. 7. Self-adhesive labels of thermal paper are suitable for information labels, such as price labels and other retail purposes. 8. The heat transfer paper self-adhesive label is suitable for printing labels on microwave ovens, weighing machines and computer printers. 9. The surface materials of the detachable self-adhesive label are coated paper, mirror coated paper, PE (polyethylene), PP (polypropylene), PET (polypropylene) and other materials. Especially suitable for information labels of tableware, household appliances, fruits, etc. After peeling off the self-adhesive label, the product leaves no trace. 10. The surface materials of washable self-adhesive labels are coated paper, mirror coated paper, PE (polyethylene), PP (polypropylene), PET (polypropylene) and other materials. It is especially suitable for information labels such as beer labels, tableware and fruits. After washing with water, the product will not leave any traces of adhesive. 1 1.PE (polyethylene) self-adhesive label fabrics are transparent, bright ivory and matt ivory. Product labels with important waterproof, oil-proof and chemical resistance are used as information labels for toilet supplies, cosmetics and other extrusion packaging. 12.PP (polypropylene) self-adhesive label fabrics are transparent, bright ivory and matt ivory. Product labels with important waterproof, oil-proof and chemical resistance are used for sanitary products and cosmetics, and are suitable for information labels of thermal transfer printing. 13.PET (polypropylene) self-adhesive label fabrics are transparent, bright gold, bright silver, sub-gold, sub-silver, ivory, and matt ivory. Product labels with important properties such as water resistance, oil resistance and chemical resistance are used for information labels of sanitary products, cosmetics, electrical appliances and mechanical products, especially high-tech products. 14.PVC self-adhesive label fabrics are transparent, bright ivory and matt ivory. Product labels with important properties such as water resistance, oil resistance and chemical resistance are used for information labels of bathroom products, cosmetics and electrical products, especially high-tech products. 15.PVC shrink film self-adhesive label is suitable for battery trademark label. 16. Bar code labels with important properties such as waterproof, oil-proof and chemical synthetic paper chemicals are used for information labels of high-end products and environmental protection products. 17:pc film label is also called: polycarbonate label is also called polycarbonate label.