Factors affecting tightness of Stretch Wrap Film
Source：Factors affecting tightness of Stretch Wrap FilmTime：2022-04-15Visitors：
The surface free energy of the stretched film determines whether the stretch film has excellent tightness, and the tightness of the stretch film surface depends on the molecular structure of the stretched film material itself.
1. The stretch film has high transparency and good gloss;
2. The stretch film shrinks rapidly at low temperature;
3. It has good sealing performance at high temperatures;
2. The surface free energy of the non-polar stretched film is small, and the surface is wet. The tension is low, generally around 30 dynes/cm. Theoretically, if the surface tension of the object is lower than 33 dynes/cm, ordinary inks or adhesives will not be able to adhere firmly, so the surface must be treated;
3. The coating will appear during the aluminizing process. Aluminum layer transfer occurs when gluing. The primary measure to prevent corona on the reverse side of the stretch film is to adjust the pressure of the rubber pinch roller in front of the corona treatment roller. The pressure at both ends of the pinch wheel should be the same, and the pressure should be appropriate.
The film has excellent transparency. The wrapped object is beautiful and elegant, making the object waterproof, dust-proof and damage-proof. The film is widely used in packaging cargo pallets, such as packaging and packaging in electronics, building materials, chemicals, metal products, auto parts, wires and cables, daily necessities, food, paper, and other industries.
Advantages of stretch film
1. The stretch film has high transparency and good gloss;
2. The stretch film shrinks rapidly at low temperature;
3. It has good sealing performance at high temperatures;
What are the factors?
1. Polyester esters (PET, PBT, PET, PETG) are polar polymers with a high surface free energy and wet surface tension above 40 dynes/cm. However, for high-speed color printing or to increase the bonding force between the vacuum aluminized layer and the surface of the BOPET film, the BOPET film needs to be surface treated to increase its wet surface tension further;2. The surface free energy of the non-polar stretched film is small, and the surface is wet. The tension is low, generally around 30 dynes/cm. Theoretically, if the surface tension of the object is lower than 33 dynes/cm, ordinary inks or adhesives will not be able to adhere firmly, so the surface must be treated;
3. The coating will appear during the aluminizing process. Aluminum layer transfer occurs when gluing. The primary measure to prevent corona on the reverse side of the stretch film is to adjust the pressure of the rubber pinch roller in front of the corona treatment roller. The pressure at both ends of the pinch wheel should be the same, and the pressure should be appropriate.
Conclusion
PE stretch film (also known as stretch film) has high tensile strength, tear strength, and good self-adhesion, which can wrap the object into a hole and prevent it from falling off during transportation...The film has excellent transparency. The wrapped object is beautiful and elegant, making the object waterproof, dust-proof and damage-proof. The film is widely used in packaging cargo pallets, such as packaging and packaging in electronics, building materials, chemicals, metal products, auto parts, wires and cables, daily necessities, food, paper, and other industries.
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