stretch film

Stretch wrap film is a packaging method that uses mechanical stretching devices or manual stretching to generate deformation stress at room temperature, tightly wrapping goods for easy transportation and storage. It is an internationally popular form of packaging. Adopting imported resin and advanced extrusion technology for thin films. It has good tensile properties, tear resistance, strong penetration resistance, high transparency, good self-adhesive properties, high shrinkage rate, tight packaging, and will not loosen. It can be widely used for single piece or pallet packaging of chemical raw materials, fertilizers, food, mechanical and electrical products, textile products, and other bundled packaging.

type

Stretch wrap film is divided into machine wrap series and hand wrap series.

Hand stretch film

a、 Thickness: 15mic-20mic

b、 Width: 5cm-45CM

c、 Elongation: 200% -400%

d、 Color: Transparent (other colors can be customized according to customer needs)

Machine stretch film

a、 Thickness: 20mic-45mic

b、 Width: 45CM-100CM

c、 Elongation: 300% -500%

application area 

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 wrapping 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.

In summary, the application fields of stretch film are very wide, and many fields in China have not yet been involved, and many fields that have already been involved are not widely used. With the expansion of application fields, the amount of stretch film will inevitably increase significantly, and its market potential is immeasurable. So it is necessary for us to vigorously promote the production and application of stretch film.

advantage

1. Stretch packaging saves raw materials compared to shrink packaging, and does not require a heat shrink packaging machine, saving energy.

2. High strength, strong elastic pulling force, can tightly wrap any geometric shape of goods, and can avoid damage caused by bundling to goods. It has good anti loosening, rainproof, dustproof, anti-theft and other effects.

3. High performance resins and auxiliary materials can be utilized to meet the needs of different users to the maximum extent possible.

4. Can manufacture single-sided adhesive products, reduce the noise generated during winding and stretching processes, and minimize dust and sand particles during transportation and storage.

Features

Rapid shrinkage at low temperatures

Good sealing at high speeds

Low temperature and high shrinkage, suitable for small packaging applications in the food industry (special types of food)

Ideal choice for "one-step" system and semi-automatic L-shaped shrink sealing roller conveyor

A drum with a diameter of 20CM is also suitable for small machines

Effective width: 200~800mm

Effective thickness: 18,20,30,40 μ m PE winding film is an industrial film packaging product with high tensile strength, elongation, good self-adhesive properties, and high transparency. Used for manual wrapping film and also for machine wrapping film, it can be widely used for centralized packaging of various goods.

PE wrapping film is mainly made by mixing and extruding several different grades of polyethylene resin, which has puncture resistance, super strength and high performance. It wraps and packages goods stacked on pallets, making the packaging more stable and tidy, and has stronger waterproof effect. It is widely used in foreign trade exports, papermaking, hardware, plastic chemical, building materials, food and pharmaceutical industries.

Testing standards and methods

Production standards

Quality requirements: (very important)

1. There should be no black impurities, the mold head should be washed clean, and there should be no burnt plastic falling in. Anything visible to the naked eye must be removed.

2. The paper tube must be aligned, not longer on one side and shorter on the other. Leave blank spaces on both sides with a standard of 1cm.

3. When packing, pay attention to protecting the edges from collision, which may cause edge breakage and quality problems. There should be no burrs.

4. Try to minimize surface wrinkles at both ends and white lines that are tightly pressed in the middle.

5. Cut the broken edges neatly, and if the cuts are uneven, they cannot be shipped as finished products. Both ends must be rolled neatly when making goods.