Versalis GPPS- HIPS products
The main characteristics common to the GPPS and HIPS grades are:
- Easy processing
- Resistance to cracking under stress
- High chemical resistance to oils, fats and chemical agents
- Deep draw thermoforming
- Heat resistance
- Good mechanical strength
- Easy flow
- High stiffness
- Excellent impact strength
- Uses with dairy products: Yoghurt pots, fromage frais packaging, ice cream boxes
- Catering: Containers and films for food use
- Fresh food: Trays and small boxes
Various transformation processes:
– Cast extrusion:
shaping the melted mass, plasticising it and homogenising it in the extruder results in an end product with a high level of transparency, gloss and stiffness.
– Extrusion blow moulding:
The melted polymer passes through a ring extruder.
This generates a tube of relatively small diameter, which is immediately expanded with blown air and stretched through traction. The film cools and solidifies.
It can then be folded between drawing rollers.
– Form Fill Seal (FFS):
Widely used in the dairy sector, this is a high-productivity manufacturing process.
Depending on the intended use, the sheet can be made up of several layers.
– Two-sided sheet:
Certain characteristics of the sheet can be improved with this technology (by drawing a moulded sheet): – transparency, mechanical properties, oxygen and water vapour permeability.
Produces items by heating semi-finished products until they reach the rubber phase (through plastic deformation).
End products produced with thermoforming include coffee cups and yoghurt pots.