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How to choose the correct GMS dosing for producing high-quality EPE foam, PE, or PP foam?
Release time:
2024-08-05 11:00
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How to choose correct GMS dosging for the producing of high quality EPE FOAM or PE (polyethylene) or PP (polypropylene) foam?
Simply because GMS, being an emulsifier and one of the most significant components, has a huge influence on many factors.
GMS is a key element in forming cell:
Surface tension during foaming - in simple terms, this is the effect that occurs as a result of the expansion of the blowing agent (Butane, CO2 and others) when heated in the extruder, precisely when the blowing agent stops flowing and forms a new cell during critical expansion, and stretches the walls of already formed cell.
GMS reduces the surface tension during expansion, helps and improves the process of cell’s formation (Gas structural element).
GMS affects the diffusion process or called also “Degassing”:
1) Increase in the dosging of GMS can improves the foaming process.
But a large concentration of GMS migrates from the lower layers of the foam to upper layers and creates an obstacle for the replacement of gas with air, which increase the conditioning time of the EPE Foam Rolls in the warehouse, and the rupture of the foam structure (formation of cell), Because the gas in the foam structure expands after production.
Also, a high gas residue in the foam structure and a high concentration of GMS on the foam surface can have a negative effect on the quality of lamination in the future.
2) An insufficient concentration of GMS contributes to a sharp release of gas before the foam matures and, as a result, collapse of the foam occurs.
Therefore, it is very important to control the dosing of GMS through Enginneer's experience and testing during production, avoiding excessive or insufficient concentration.
GMS reduces friction and static charges on the foam surface
Reduction of static charges on the surface of the foam during the production process - static charges accumulate on the surface of the foam as a result of friction - thus reducing the risk of fire.
Consition of warehouse is also very important elements during the foaming, eg Temperature, Space,Air etc.
The problem of many foam manufacturers working with ultra-light, low density foams is mainly the shrinkage or rapid expansion of the foam during the conditioning process in the warehouse and the resulting formation of "bubbles" and breaks on the surface.
The correct dosing of GMS depends on many factors such as foam density, raw material dosage kg/h, ambient temperature, ambient humidity, temperature fluctuation during the day and night, and so on.
Therefore, it is very important to choose the correct dosage of GMS during the foaming process.
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