Stretch film, also known as wrapping film, pallet film, has the characteristics of good stretch performance, tear resistance, strong penetration resistance, high transparency, good self-adhesion and high shrinkage rate, tight packaging, no looseness . It can be widely used in single-piece or pallet packaging of chemical raw materials, chemical fertilizers, food, mechanical and electrical products, light textile products and other bundling packaging. With the popularization of applications, stretched films are more and more loved by friends. Today, Shenzhen stretch film manufacturer (world packing industrial) will share with you what are the characteristics of good stretched films. Let us take a look.
First, look at the appearance:
Good quality stretch film has soft and natural appearance and good transparency. Put a newspaper at 20 cm below the stretch film, you can clearly see the words above, and it will not affect reading. Due to the addition of plasticizers, titanium dioxide, etc., the stretched film with a slightly poor quality will make the surface look bright and thick, but the transparency is poor.
Second, tensile measurement:
Stretching is the ability of a stretched film to produce elastic elongation after being pulled, 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 be broken. The poor quality of the stretch film has two characteristics: ①, the tensile force is uneven, and it is obvious that the stretch becomes thin in some places during stretching, and there is almost no change in some places. 2. The stretch rate is small, and there will be a phenomenon of breaking when pulling.
Thirth, Self-adhesion:
Self-adhesiveness refers to the adhesiveness between the stretched films after contact. This feature can make the packaged items tight without loosening during the stretch winding process and after wrapping. Self-adhesiveness is affected by various external factors, such as humidity, dust, and contaminants. A good stretch film has a self-adhesion of about 1N / c㎡. Wrap ordinary eggs in stretch film, and then press down on the size of the thumb. Can lift eggs. Poor quality stretched film cannot achieve this effect.
Fourth, toughness (puncture resistance):
Toughness refers to the comprehensive performance of tensile film against puncture and tear resistance. The value of the degree of danger of the tear resistance must be horizontal, that is, perpendicular to the direction of operation of the machine, because tearing in this direction will loosen the package, even if tearing in the longitudinal direction, the package will still be strong. Therefore, the stretch film The better the toughness, the better the quality. The toughness of the stretched film with poor quality is generally not high. You can wrap the stretched film with some water and pierce it with a ballpoint pen. There will be no water leakage at a depth of 5 cm, which means that the stretched film has good toughness.
Shenzhen World Packing Industrial Ltd
Stretch Film & Packing Tape Specialist , Top China manufacturer
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