Use and identification techniques of polyethylene packaging materials
Apr 01, 2019
Polyethylene packaging materials are widely used, among which agricultural film is the largest in the use of polyethylene packaging materials. Because polyethylene packaging materials have the advantages of high light transmittance, good heat preservation and moisturizing performance, and low cost, the solar greenhouse or arch shed used for it can artificially create a "small climate" suitable for crop growth, and achieve the purpose of increasing production and income of agricultural products.
The agricultural polyethylene packaging materials include mulch film, shed film and mulch film (mainly single-layer low-density polyethylene, which is required to be continuously covered for more than 150 days and can be recovered in large pieces. Generally, the film is between 0.005 and 0.006 mm in thickness. The main raw material of shed film is polyethylene, polyvinyl chloride or EVA, among which polyethylene consumes the most. Its products include polyethylene shed film, polyethylene composite function film, black, silver gray, purple, green, etc. A polyethylene colored shed film.
Commonly used food plastic bags are also made of polyethylene packaging materials, which are non-toxic and can be used to hold food. Polyethylene film milky white, translucent, lubricated feels more as if coated with a wax layer on the surface, shake vigorously voice brittle, flammable fire, the yellow flames, mucus dripping when burning the candles combustion odor. If the PVC is not transparent, it will be sticky on the surface, and the sound will be low and the sound will be low. It will not burn when it is fired, and the flame will be green.
