The use form of the sealed packaging of the stretch film

The airtight packaging of the stretch film, which is similar to shrink film packaging, the film wraps the tray around the tray, and then two heat grippers heat seal the film at both ends together. This is an earlier form of use of stretch film, and more packaging forms have been developed from it.

The full-width packaging of the stretch film, this kind of packaging requires the film width to cover the tray, and the shape of the tray is regular, so it has it in use, suitable for the film thickness of 17 ~ 35μm, this kind of packaging is a relatively simple kind of stretch film packaging , the film is mounted on a rack or by hand, rotated by the tray or the film is rotated around the tray. Mainly used for repackaging after the packaged pallet is damaged, and ordinary pallet packaging. The packaging speed is slow, and the suitable film thickness is 15-20 μm.

Different from other packaging, the film revolves around the item, suitable for long cargo packaging, such as carpets, boards, fiberboards, profiled materials, etc. This is one of the new uses of stretch film, which is better than the old-fashioned paper tube packaging with stretch film. A suitable film thickness is 30 to 120 μm. This is a new packaging form of wrapping film, which can not only reduce material consumption, but also reduce the storage space of pallets. In foreign countries, this kind of packaging was first introduced in 1984. Just one year later, many such packaging appeared in the market. The form has huge potential. Suitable for film thickness of 15 ~ 30μm;

An example of the application of stretch film in special fields. After the packaging equipment is installed in the production line, the fully automatic stretch film can not only replace the tape to bind the material, but also play a protective role. The applicable thickness is 15-30. The packaging of stretch film must be stretched, and the stretching forms of pallet mechanical packaging include direct stretching and pre-stretching. There are two types of pre-stretching, one is roller pre-stretching and the other is electric stretching. Direct stretching is done between the tray and the film. This method has a low stretch ratio (about 15% to 20%). If the stretch ratio exceeds 55% to 60%, it exceeds the original yield point of the film, the film width is reduced, and the puncture performance is also lost. easy to break. And at 60% stretch rate, the pulling force is still very large, and for light cargo, it is likely to deform the cargo.