Stretch film has a wide range of applications, mainly in conjunction with pallets, to package loose goods and replace small containers. Because it can reduce the cost of bulk cargo transportation and packaging by more than 30%, it is widely used in the whole package of hardware, minerals, chemicals, medicine, food, machinery and other products; in the field of warehouse storage, foreign countries also use more Stretch-wrapped film tray packaging for three-dimensional storage to save space and space.

The use form of the wrapping film:wrapping film:

Sealed packaging

This package is similar to a shrink wrap package in which the film wraps around the tray and the two hot grips heat seal the film at both ends. This is an early use form of the wrap film zui, and thus more packaging forms have been developed.

2. Full width packaging

This type of packaging requires a film width sufficient to cover the tray, and the shape of the tray is regular, so it is used for it, and is suitable for a film thickness of 17-35 μm.

3. Hand packaging

This kind of packaging is a simple type of Zui in Kunshan wrapping film packaging. The film is mounted on a rack or by hand, rotated by the tray or the film is wound around the tray. It is mainly used for repackaging after the packaged tray is damaged, and for ordinary tray packaging. The packaging speed is slow, and the suitable film thickness is 15-20 μm;

4. Stretch film winding machine packaging

This is a widely used mechanical packaging form of Zui. It is rotated by the tray or the film is rotated around the tray, and the film is fixed on the bracket to move up and down. This packaging capacity is very large, about 15-18 discs per hour. Suitable film thickness is about 15-25 μm;

5. Horizontal mechanical packaging

Different from other packaging, the film is rotated around the article, suitable for long cargo packaging, such as carpet, board, fiberboard, profiled materials, etc.;

6. Paper tube packaging

This is one of the new uses of the stretch film, which is better than the wrap film packaging for the old paper tube packaging. Suitable film thickness is 30-120 μm;

7. Packaging of small items

This is the new packaging form of the wui film, which can reduce the material consumption and reduce the storage space of the tray. In foreign countries, this package was first introduced in 1984, only one year later, there are many such on the market. Packaging, this form of packaging has great potential. Suitable for film thickness 15-30μm;

8. Tube and cable packaging

This is an example of the application of Kunshan stretch film in special fields. After the packaging equipment is installed in the production line, the fully automatic winding film can not only bind the belt to the material, but also protect it. A suitable thickness is 15-30 μm.

9. Stretched form of tray mechanism packaging

The wrapping film package must be stretched, and the stretched form of the tray mechanical package has direct stretching and pre-stretching. Pre-stretching is divided into two types, one is roll pre-stretching and the other is electric stretching.

Direct stretching is done by stretching between the tray and the film. This method has a low draw ratio (about 15%-20%). If the draw ratio exceeds 55%-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% elongation, the pulling force is still very large, and for light goods, it is likely to deform the goods.

Pre-stretching is done by two rolls. The two rollers pre-stretched by the roller are connected by the gear unit, and the stretching ratio can be different depending on the gear ratio. The pulling force is generated by the turntable. Since the stretching is generated within a short distance, the friction between the roller and the film is generated. It is large, so the film width is not reduced, and the original puncture performance of the film is maintained. No stretching occurs during actual winding, which reduces breakage due to sharp edges or corners, and this pre-stretching can increase the draw ratio to 110%.

The stretching mechanism of the electric pre-stretching is the same as that of the roll pre-stretching, except that the two rolls are electrically driven, and the stretching is completely independent of the rotation of the tray. Therefore, the adaptability is stronger, light, heavy, and irregular goods are applicable. Because of the low tension during packaging, the pre-stretching ratio of this method is as high as 300%, which greatly saves materials and reduces costs. Suitable for film thickness 15-24μm.