The Usage Form Of Wrapping Film

1. Sealed packaging
This type of packaging is similar to shrink wrap packaging, where the film wraps around the tray to wrap it all around, and then two heat grippers heat seal the two ends of the film together. This is the earliest form of use of stretch film, which has led to the development of more packaging forms
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 suitable for use with a film thickness of 17-35 μ m
3. Handmade packaging
This type of packaging is the simplest type of wrapping film packaging, where the film is mounted on a rack or held by hand, rotated by a tray, or wrapped around a tray. Mainly used for repackaging damaged pallets and ordinary pallet packaging. This type of packaging has a slow speed and is suitable for a film thickness of 15-20 μ m;
4. Stretch film winding machine packaging
This is the most common and widely used form of mechanical packaging, which is rotated by a tray or film around the tray, and the film is fixed on a bracket and can move up and down. This packaging has a large capacity, about 15-18 plates per hour. The suitable film thickness is about 15-25 μ m;
5. Horizontal mechanical packaging
Different from other packaging, it is wrapped around the item with a film, suitable for packaging long goods such as carpets, boards, fiberboards, profiled materials, etc;
6. Packaging of paper tubes
This is one of the latest uses of wrapping film, which is better than old-fashioned paper tube packaging with wrapping film. The suitable film thickness is 30-120 μ m;
7. Packaging of small items
This is the latest packaging form of wrapping film, which can reduce material consumption and also reduce the storage space of pallets. In foreign countries, this type of packaging was first introduced in 1984, and just one year later, many such packaging forms appeared on the market, which has great potential. Suitable for film thickness of 15-30 μ m;
8. Packaging of pipes and cables
This is an example of the application of stretch film in special fields. The packaging equipment is installed at the end of the production line, and the fully automatic stretch film can not only replace the tape to bind the material, but also provide protection. The applicable thickness is 15-30 μ m.
9. Stretch form of tray mechanism packaging
The packaging of stretch film must be stretched, and the stretching forms of tray mechanical packaging include direct stretching and pre stretching. Pre stretching can be divided into two types: roller pre stretching and electric stretching.
Direct stretching is the process of stretching between the tray and the film. This method has a low stretching ratio (about 15% to 20%). If the stretching ratio exceeds 55% to 60% and exceeds the original yield point of the film, the film width decreases, the puncture performance is also lost, and the film is easily broken. And at a 60% elongation rate, the tensile force is still very high, which may cause deformation of light goods.
Pre stretching is accomplished by two rollers. The two rollers for pre stretching are connected by a gear unit, and the stretching ratio can vary depending on the gear ratio. The tension is generated by the turntable. As stretching occurs over a short distance, the friction between the rollers and the film is high, so the film width does not shrink and the original puncture performance of the film is maintained. No stretching occurs during actual winding, reducing the risk of breakage caused by sharp edges or corners. This pre stretching can increase the stretching ratio to 110%.
The stretching mechanism of electric pre stretching is the same as that of roller pre stretching, except that the two rollers are driven by electricity and stretching is completely independent of the rotation of the tray. So it has stronger adaptability, suitable for light, heavy, and irregular goods. Due to the low tension during packaging, this method has a pre stretching ratio of up to 300%, greatly saving materials and reducing costs. Suitable for film thickness of 15-24 μ m.