Why should I add additives to stretch film?

1. Compatibility

Poor compatibility will cause "migration" phenomenon, manifested in liquid additives as "sweating" and solid additives as "spray frost".

Sometimes when the requirements for stretch film are not too strict, it can be allowed to lack compatibility, such as poor compatibility between filler and resin. As long as the filled particle size is small, it can still meet the basic requirements of stretch film performance, and if it is treated with coupling agent or surfactant, it can better play its function. However, there are some additives that improve the surface properties of stretch film, such as opening agents, antistatic agents, etc., which require them to be slightly migratory so that they can play a role on the surface of the stretch film.

2. Durability

It is required that additives exist in the stretch film for a long time with little or little loss, and the loss of additives is mainly through three ways: volatilization, extraction and migration. This is mainly related to the molecular weight of the additives, the solubility in the medium and the solubility in the resin.