Metal bars can't be directly pasted on the white wall. The metal strip is not firmly adhered to the white wall directly and will fall off. It must be fixed with a fixture to be firm.

metal bar codes use metal as the base material or production material, which can resist high and low temperature, acid and alkali, and have long service life. Manufacturing technology of metal bar code. Photolithography metal bar code can be made on site, which is convenient to use, but its base material is limited to some extent because the principle of bar code reading is based on the contrast between bar and space.

the reading rate is not high, the reading speed is low, and the cost is high. If the image is complex, the production speed is slow. Specially printed metal bar code is contrary to photoetching metal bar code, but its wear resistance is low. Etched metal bar code not only has the advantages of special printed metal bar code, but also has strong wear resistance.

metal bar codes are resistant to corrosion, high and low temperatures, wind, rain, snow erosion and sun exposure, and have long service life. It can be used for a long time in outdoor or indoor kitchen/chemical plant and other harsh environments. It is the only thin and tough bar code that can be used for a long time in outdoor or indoor kitchen/chemical plant and other harsh environments. The temperature range is 41 to 211℃, and the metal bar code system can be widely used in large chain restaurants.