How to use stretch film

Sealed package
This kind of wrapping is similar to shrink film wrapping. The film wraps the tray around the tray, and then two heat grabbers heat seal the films at both ends. This is the earliest use of stretch film, and more wrapping methods have been developed from this


Full width package
This kind of package requires the film to be wide enough to cover the pallet. The shape of the pallet is regular, so it has its own, suitable for film thickness of 17～35μm.


Hand-wrapped
This kind of package is the simplest kind of stretch film package. The film is mounted on a rack or held by hand, and is rotated by the tray or the film is rotated around the tray. It is mainly used for re-wrapping after the wrapped pallet is damaged, and ordinary pallet wrapping. This kind of wrapping speed is slow, and the suitable film thickness is 15-20μm;


Stretch film wrapping machine
This is one of the most common and extensive mechanical wrapping methods. The tray rotates or the film rotates around the tray. The film is fixed on the bracket and can move up and down. This kind of wrapping capacity is very large, about 15-18 trays per hour. The suitable film thickness is about 15-25μm;





Horizontal mechanical package
Different from other packages, the film revolves around the goods, which is suitable for long packages of goods, such as carpets, boards, fiberboards, special-shaped materials, etc.;


Parcel of paper tube
This is one of the latest uses of stretch film, which is better than the old-fashioned paper tube wrapping. The suitable film thickness is 30～120μm;


Package of small items
This is the latest wrapping method of stretch film, which can not only reduce material consumption, but also reduce the storage space of pallets. In foreign countries, this kind of package was first introduced in 1984, and only one year later, many such packages appeared on the market. This package method has great potential. Suitable for film thickness of 15～30μm;


Tube and cable wrapping
This is an example of the application of stretch film in a special field. The wrapping equipment is installed at the end of 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 15-30μm.


Stretching method of pallet mechanism package
The wrapping of stretch film must be stretched, and the stretching methods of pallet mechanical wrapping include direct stretching and pre-stretching. There are two types of pre-stretching, one is roll pre-stretching and the other is electric stretching.
Direct stretching is to complete the stretching between the tray and the film. This method has a low stretch magnification (about 15%-20%). If the stretch magnification exceeds 55%-60%, which 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 goods, it is likely to deform the goods.


The pre-stretching is done by two rollers. The two rollers of the roller pre-stretching are connected together by a gear unit. The stretching ratio can be different according to the gear ratio. The pulling force is generated by the turntable. Since the stretching is generated in a short distance, the friction between the roller and the film It is also large, so the film width does not shrink, and the original puncture performance of the film is also maintained. No stretching occurs during actual winding, which reduces the breakage caused by sharp edges or corners. This kind of pre-stretching can increase the stretching ratio to 110%.

The stretching mechanism of electric pre-stretching is the same as that of roll pre-stretching. The difference is that the two rolls are driven by electricity, and the stretching is completely independent of the rotation of the tray. Therefore, it is more adaptable, suitable for light, heavy, and irregular goods. Due to the low tension during wrapping, the pre-stretching ratio of this method is as high as 300%, which greatly saves materials and reduces costs. Suitable for film thickness of 15-24μm.