• ADDRESS

    Sha hu kou district,Changping Town,Dongguan,PRC

  • EMAIL

    mila@joypackcn.com

  • PHONE

    +86 13538551268

WHAT WE DO
News
How to judge whether the stretch film viscosity is sufficient?
Source:Mingye Packing Materials Co.,Ltd   Release date:2020-10-24   Hits:148
joypack is a professional stretch film manufacturer, providing high-quality stretch film products and competitive prices. Nowadays, many companies do not know how to judge whether the viscosity of the stretch film is sufficient when they buy stretch films. Today joypack will introduce you to the method of judging the viscosity of the stretch film.

1. The influence of molecular weight on the viscosity of stretched film: the molecular weight is different, the adhesion performance will be different, the film with high molecular weight has higher adhesion, but as the molecular weight of PIB increases, the adhesion will decrease; If it is low, the viscosity retention time is too short due to its relatively easy volatilization. Therefore, selecting PIB with appropriate molecular weight can make the stretched film have a better viscosity. Studies have shown that PIB with a number average molecular weight of about 1300 is more suitable for increasing the self-adhesiveness of stretched films.

2. The effect of the addition amount on the viscosity of the stretched film: The viscosity of the stretched film is positively correlated with the amount of PIB added. However, after the addition of PIB exceeds 3%, the improvement of the self-adhesiveness of the stretched film will become insignificant. If the addition of PIB continues to be increased, PIB will precipitate and form blocks on the surface of the film, causing uneven self-adhesiveness of the film, or even The film roll is difficult to open. In order to ensure the final performance of the stretched film, and comprehensively consider the cost of raw materials, the amount of PIB added should be controlled between 1 to 3%. PIB has an exudation process, and it usually takes about three days to stretch the film surface to produce sufficient viscosity.

3. The influence of storage temperature of stretched film on viscosity: The migration speed of PIB is related to the storage temperature. As the ambient temperature increases, the migration speed of PIB increases and the viscosity increases. Therefore, in order to achieve the required viscosity, the stretched film should be stored at a higher temperature, and it can generally meet the requirements after a week. However, if stored in an environment higher than 30℃ for a long time, PIB will precipitate out in large quantities, which will easily cause the film roll size or paper core to come off. Therefore, after reaching the viscosity requirements, it should be placed in an environment of -15℃~40℃ store.


stretch film manufacturer

If you have any advice or requirement,please send message to us online.

Sha hu kou district,Changping Town,Dongguan,PRC

+86 13538551268

mila@joypackcn.com

Contact Us