What are the characteristics of a good stretch film?

Stretch film, also known as stretch film, heat shrink film, has good tensile properties, tear resistance, strong penetration resistance, high transparency, good self-adhesiveness and high shrinkage, tight packaging, no looseness, etc. Features. It can be widely used in single-piece or pallet packaging and other bundled packaging of chemical raw materials, fertilizers, food, mechanical and electrical products, light textile products, etc. With the popularization of applications, stretch stretch film has become more and more popular among friends. Today I will share with you what are the characteristics of a good stretch stretch film. Let us take a look at it.

What are the characteristics of a good stretch film?


1. Look at the appearance:
A good quality stretch wrap film has a soft, natural appearance and good transparency. Put a newspaper 20 cm below the stretch film, and you can clearly see the words on it without affecting reading.

A stretched film with a lower quality will make the surface look bright and feel thick due to the addition of plasticizers, titanium dioxide, etc., but the transparency is poor, which is a good distinction.


2. Measuring stretch:
Stretching is the ability of stretch film to produce elastic elongation after being stretched, which is a characteristic of itself. If the quality is good, the length will be extended after stretching, and within a certain limit (300%-700%), it will not break.

There are two characteristics of poor quality stretched film pullers: 1. The tension is not uniform. When stretching, it is obvious that some places are stretched and thinned, and there is almost no change in some places. 2. The stretch rate is small, and it will break when stretched.


3. Self-adhesiveness:
Self-adhesiveness refers to the adhesion between stretch wrap films after contact. This feature can make the packaged goods tighten and not loose during the stretch wrapping process and after wrapping.


The self-adhesiveness is affected by many external factors, such as humidity, dust and pollutants. The self-adhesiveness of a good stretch film is about 1N/c㎡. Wrap an ordinary egg with a stretch film, and then press a thumb-sized place. Can lift eggs. A stretched film of poor quality cannot achieve this effect.





4. Toughness (puncture resistance):
Toughness refers to the comprehensive performance of stretch wrap film resistance to puncture and tear. The degree of risk of tearing resistance must be taken horizontally, that is, perpendicular to the machine operation direction, because tearing in this direction will loosen the package. Even if the longitudinal tear occurs, the package can still remain strong. Therefore, the stretch film The better the toughness, the better the quality.

The toughness of the stretched film of poor quality is generally not high. You can wrap some water in the stretched film and pierce it with a ballpoint pen. There will be no water leakage at a depth of 5 cm, which indicates that the stretched film has good toughness.


5. From the perspective of the tightness of the stretched film:
A good stretch film is tightly wound, and a bad stretch film is loose and easy to break.


6. Distinguish from the color:
From the point of view of the object, a good stretch film has good permeability and is transparent and white.