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What are the characteristics of a qualified stretch film?
Source:Mingye Packing Materials Co.,Ltd   Release date:2020-03-15   Hits:870
Stretch film is also called stretch film, heat shrink film. Can be widely used in chemical raw materials, fertilizers, food, mechanical and electrical products. Lightweight textile products such as single-piece or pallet packaging and other strapping packaging. With the popularization of applications, stretch films are more and more popular among friends.

Features of stretch film:

1. Good tensile properties
2. Tear resistance
3. Strong penetration resistance
4. High transparency
5. Good self-adhesion and high shrinkage rate
6. Pack tightly and not loose.


First, look at the appearance:


好的 Good quality stretch film has soft, natural color and good transparency. Place a newspaper 20 cm below the stretch film. You can clearly see the above words, and it does not affect reading. A slightly inferior stretched film is due to the addition of plasticizers, titanium dioxide, etc. Will make the surface look shiny and feel thick. But the transparency is poor, which is a good distinction.


Second, measuring stretch:


Stretching is the ability of a stretched film to produce elastic elongation after being pulled. This is a feature of its own. If the quality is good, the length will be extended after stretching. And within a certain limit (300% -700%), it will not break. The poor quality stretch film has two characteristics: ①, uneven tension. When stretching, it is obvious that there are places where the stretching becomes thin, and there is almost no change in some places. 2. The elongation is small, and it will break when pulled.


Three, self-adhesive:


Self-adhesion refers to adhesion after contact between stretched films. This feature enables the package to be tightened without loosening during stretch wrapping and after wrapping. Self-adhesion is affected by many external factors, such as humidity, dust and pollutants. The good self-adhesive stretch film is about 1N / c㎡. Wrap a normal egg with a stretch film, and squeeze a thumb-sized area. Can lift eggs. Poorly stretched films do not achieve this effect.


Fourth, toughness (puncture resistance):


Toughness refers to the comprehensive properties of stretch film resistance to puncture and tear. The value of the degree of danger of tear resistance must be taken horizontally. That is perpendicular to the machine operating direction. Because tearing in this direction will loosen the package. The package remains strong even if a longitudinal tear occurs. Therefore, the better the toughness of the stretched film, the better the quality. A stretched film with poor quality is generally not high in toughness and can be wrapped in some water with a stretched film. Use a ballpoint pen tip to puncture, there will be no leakage at a depth of 5 cm, which indicates that the stretch film has good toughness.
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Sha hu kou district,Changping Town,Dongguan,PRC

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