PVC hot formed products, due to the high variability of PVC raw material formula, their performance can be adjusted within a certain range by changing the formula to meet the needs of packaging and various uses of food, medicine, daily products, and many chemical products. Especially PVC packaging containers, such as cups, plates, plates, boxes, etc., have a series of excellent properties, such as transparency, hygiene, oil resistance, barrier performance, necessary heat resistance, and resistance to chemical corrosion. Polyvinyl chloride (PVC) sheets have excellent comprehensive performance, relatively low price, and outstanding hot forming performance, making them one of the varieties with excellent hot forming performance among various plastic sheets. Among them, hard polyvinyl chloride (PVC) board (sheet) material is an excellent packaging material with excellent transparency, luster, suitable impact strength, hardness and rigidity, suitable heat resistance, cold resistance, and weather resistance. It has good molding processing ability and can be continuously molded, good printing performance, good coloring performance, good chemical stability, good barrier performance, non-toxic, odorless, resistant to mold and bacteria, and affordable price. At present, rigid polyvinyl chloride (PVC) sheets have become an important packaging material in the field of packaging. They are used for packaging textiles such as clothing. Transparent PVC sheets with a thickness of 0.5-0.8mm can be used to make convex cover packaging, which has excellent moisture and mold resistance; Used for packaging small department stores and daily necessities, often using fixed bottom box packaging; For food packaging, transparent sheets with a thickness of 0.1-0.3mm are generally used to package sauce containing braised fish, meat and eggs, cream, tomato sauce, pickled vegetables, candies, biscuits, etc; It can also be used for packaging of chemical drugs and pharmaceuticals, as well as packaging of precision instruments and industrial materials. In summary, the variety of transparent films, from colored transparent films to colorless transparent films to non-toxic transparent films, is gradually increasing, and their application range is also very wide. The quality indicators of PVC sheets include: 1. Appearance. No oil stains, basically consistent color, no perforation marks, cracks, and strip-shaped bubbles or wrinkles that are not conducive to secondary processing are allowed; No impurities with crystal dots larger than 13mm and black and white dots larger than 0.8mm are allowed; There should be no more than 75 crystal dots below 13mm in an area of 50cm x 50cm, and no more than 30 black and white dot impurities between 0.3-08mm in 1m2; The finished roll has a uniform and even thickness. 2. Physical and mechanical properties. The physical and mechanical properties of PVC extruded transparent hard sheets for food packaging comply with the professional standard ZBY 28003-1985 of the Ministry of Light Industry, as shown in the table below. picture 3. Hygienic performance. The transparency of PVC transparent hard sheets can reach over 88%, and the haze is generally 3.0%. Among plastic sheets, it belongs to high transparency varieties. The hygiene performance meets the requirements of ZBY 28003-1985.
Post time: Mar-11-2024