Want to know what factors affect the ductility of the stretch film? Then we will give you a good introduction to the small series of our wrapping film. Let's take a look at it together.
The factors that affect the ductility of the wrap film are as follows:
1. A non-polar polymer. The surface of the wrap film is free from energy efficiency, the surface wet tension is relatively low, and the ordinary ink or adhesive cannot be adhered firmly, so it is subjected to surface treatment.
2. Polyester, which is a polar polymer, has a high surface free energy and a relatively large surface wet tension. However, for the bonding between the printing and the surface of the film, a surface treatment is also required to increase the wet tension of the surface.
3. When performing surface treatment, it is necessary to prevent the reverse side of the film from corona, and adjust the pressure of the rubber pressure roller before the corona treatment roller to ensure the proper pressure.
When the test film retracts the stress on the test surface, a strict dynamic and static balance test is carried out to ensure that the film can smoothly enter the corona roll, avoiding the problem that the wrap film is uneven or uneven in thickness and the ductility is not uniform.
Q: I need a plastic wrap without odor. What do I need to do?
A: The odor of cling film is related to his ripening time. If there is no smell, it needs to be stored in the warehouse for 2-3 weeks.
Q: How is the cling film generally packaged?
A: It can be packed in a color box, and the logo and pattern can be printed on the color box. Sawtooth and slipper can also be installed for ease of use.
The tension of the wrapping film is a factor that we all judge when we choose the quality, so the manufacturer will pay attention to this problem, then do you know what factors will affect its tension? Let's take a look at our introduction. I believe that we can make everyone understand and use it better.
Stretch film tension is affected by multiple factors, as described below:
The non-polar polymer has a small free energy and a low surface wet tension, generally about 30 dynes/cm. In general, if the external tension of the object is less than 33 dynes/cm, the ordinary ink or the adhesive cannot be firmly attached, and it is necessary to be surface-treated.
When the aluminum is plated, the transfer of the aluminized layer occurs, and the transfer of the adhesive layer occurs when the glue is applied. The main measure to prevent the corona on the reverse side of the film is to adjust the pressure of the rubber pinch roller before the corona treatment roller. The pressure at both ends of the pinch roller should be consistent and the pressure should be appropriate.
Polyester is a polar polymer with a high surface free energy. However, for high-speed black printing or to increase the bonding between the vacuum aluminum plating layer and the appearance of the BOPET film, it is also necessary to externally treat the BOPET film to further improve the surface wet tension.
When testing the external tension of the wrapping film, a strict dynamic and static balance test must be carried out to ensure that the plastic film enters the corona roller smoothly and prevents the air from being trapped, thereby preventing the phenomenon of reverse corona.