Application of HDPE film in packaging field

1) HDPE is one of the most widely used and consumed products in the field of packaging. One of the reasons for the rapid growth in recent years is the rapid increase of supermarkets and retail goods. Compared with LDPE, HDPE micro-thin film has high strength and good tensile properties. The film with the same strength can be half thinner than LDPE, so it can reduce raw material consumption and cost. At present, the LDPE film packaging market is more and more replaced by HDPE film. In addition HDPE has excellent oil-proof, anti-

Water and moisture resistance, high heat sealing strength, good opening, and suitable for printing, etc., usually used as food packaging bags, general shopping bags and garbage bags.

2) In addition to being suitable for making various film bags, HDPE can also replace cellophane for candy packaging. For example, the uniaxially stretched HDPE film for kink packaging has good transparency, gloss, kink fixation, decoration, oil resistance, moisture resistance, adaptability to packaging machinery and printing machines, etc., and is used to replace cellophane. It is one of the more suitable materials for candy packaging.

3) The application of HDPE film in the preservation of fruits and vegetables is also becoming more and more extensive. In the process of packaging fruits, usually a single piece of HDPE film is packaged individually and then sealed. The sealing process is done by using a hair dryer to make the HDPE film adhere to the surface of the fruit. , leave no gaps, or soak fruits and vegetables for 24 hours with a solution of 1000mg/kg carbendazim and 250mg/kg. Tangerines and sweet oranges, which have been sealed with HDPE, have been stored in a room temperature warehouse for more than 6 months. They have a very good fresh-keeping effect and still have good color, aroma and taste. After the evaporation and respiration of vegetables, fresh vegetables are packaged in HDPE film for hibernation storage, which can prevent the reduction of freshness caused by evaporation and loss of water, such as the reduction of quality and inhibition of vegetable respiration, and delay the loss and ripening of ingredients, thereby maintaining freshness. effect, and the storage period of tomatoes can be as long as

46d (day), lotus root 25d.

4) HDPE has good heat resistance. After modification, it can be used as a sealing layer in a retort pouch with a PET/AI foil sealing layer structure. This retort pouch can be sterilized at a temperature of 121-134°C.

5) There is also a vertically and horizontally stretched cross composite film, the inner layer is a horizontally stretched HDPE film, the outer layer is a longitudinally stretched HDPE film, and the middle layer is an adhesive. This kind of cross composite film can be used as a heavy packaging bag. In terms of strength, its thickness can be half that of LDPE heavy packaging bags, while its elastic modulus is twice as high, and it has the stiffness of kraft paper. It can pack items with a temperature of 100°C. Pesticides and other packaging, can also be used as container bags and so on.

6) The application of HDPE fertilizer packaging bags is also an important aspect. Fertilizer packaging used to be single-packed with polyethylene film. In the late 1970s, the outer layer of polypropylene woven bag and the inner layer of low-density polyethylene film were double-packed. In the 1980s, HDPE inner village bags were used to replace LDPE bags.