What are the technological processes in sign production?

1. Machining and molding: logo sign production is painted after machining and molding, so that its installation dimensions are unified and standardized, and it can be mass-produced. The processing of instrument spray-painted panels requires strict dimensions and requires experienced fitters and milling workers. If possible, you can use a CNC drilling machine.

2, degreasing: identification marks In order to make the surface of aluminum plate have a certain affinity for printing paint, the oil stain on the surface of the plate should be removed. Generally, soft sawdust can be used to wipe off the packaging oil first, and then organic solvent can be used to remove the oil; Oil stains in machining can be chemically removed with organic solvents or alkaline solutions.

3. Polishing: If there are scratches on the surface of the plate, a layer of putty should be scraped to make it smooth, and mechanical polishing, chemical polishing or electrochemical polishing should be selected according to customer requirements.

4. Primer spraying: Due to the poor combination of aluminum alloy materials with topcoat and ink, aluminum alloy panels need to be sprayed with a layer of zinc oxide yellow primer with a thickness of about 0.0 1mm before topcoat spraying.

5. Top coat spraying: according to customer's requirements, spray the corresponding color of amino paint or acrylic paint. For light-colored paints, especially white paints, the drying temperature and time should be strictly controlled, otherwise the white paint will turn yellow.

6. Screen printing: The general requirements for printing signs are: accurate and clear graphic position, neat edges of word lines and firm ink marks.

(1) screen. Choose different screens according to the font line thickness. Commonly used screens are 250T, 300T, 350T and 420S polyester screens. If the word line diameter is less than 1.5mm, the monofilament yellow polyester net with more than 350 meshes should be selected.

(2) Stretching angle. When the stretching angle is 22.5', the inking area under the word line is large and the edge of the word line is neat.

(3) scraper. The scraper should be flat-pointed, the Shore hardness should be 65'-70', and the line contact should be ensured when printing. The scraper for printing signboard panels should be dedicated.

(4) Clear spacing. Large mesh tension and small mesh spacing are beneficial to clear graphics. When determining mesh tension, the mesh spacing should be controlled at 2-3 mm..

(5) printing ink. Japanese Toyo SS series, IPI series and Seiko series are imported, and Tianjin Xiangyang brand 27 1 1-4 instrument ink and glass ink are made in China. If Tianjin Tiannv brand 8-prefix bright offset printing ink is used, it should be dried below 120℃. The drying of red panel paint requires low temperature and short time.

7. Top coat spraying: Brush can be used when the requirements are not high, and H-type water-soluble acrylic paint or amino paint can be used as the paint material.

8. Packaging: As the plates are heavy, the signs are easy to bump against each other. Old paper without pictures and texts can be sandwiched in the finished product to protect its surface. The manufacturing process of aluminum signs varies according to their types. The common types of aluminum signs are flat screen printed aluminum signs, etched painted aluminum signs, oxidized screen printed (dyed) aluminum signs, sandblasted aluminum oxide signs, heat transfer aluminum signs, flat photo aluminum signs and so on. The production process of each kind of logo is very different, and it is difficult to explain it in detail due to space reasons.