Condensation of water vapour on food packaging films not only reduces the visibility of the packaged contents, but can also result in degradation of food quality and freshness. Modification of film properties through the use of anti-fog additives can prevent the occurrence of condensation and fogging. The additives can be incorporated into polyolefin film resins to form a masterbatch.
The team has successfully produced an anti-fog masterbatch with high concentration of anti-fog agent in polyolefin carrier resins through a twin screw compounding process incorporated with a continuous liquid injection system. The intensive distributive and dispersive mixing of the anti-fog additive and carrier resin was achieved by melt blending, using proprietary screw design and process control.
Technology Features, Specifications and Advantages
- Excellent anti-fog performance – high evaluated score in cold fog test for both single and multilayer films
- High thermal stability of anti-fog agent
- High concentration (>20 wt%) of anti-fog agent
- Formulation of polyolefin carrier resins can be tailor-made according to different film manufacturing requirements
- Compounding with liquid form additives is possible
- Suitable for LDPE, LLDPE, PP, and also some types of biodegradable polymers
This anti-fog masterbatch is suitable for packaging applications, e.g. food packaging films, and agricultural applications, e.g. greenhouse films, to provide good light transmission and anti-drop function.
The screw design and process methodology is also suitable for compounding other liquid additives, such as plasticisers, slip agents, colourants, etc.
- Maintenance of film transparency for attractive presentation of packaged contents
- Reduced food spoilage
- Cost effective
- Clean process for blown films and cast films