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When producing high-quality EPE foam, PE (polyethylene) foam, or PP (polypropylene) foam, how do you select the appropriate GMS dosage?
Release time:
2024-08-05 10:54
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When producing high-quality EPE foam, PE (polyethylene) foam, or PP (polypropylene) foam, how do you select the correct GMS dosage?
Because GMS, as an emulsifier and one of the most important ingredients, exerts a significant influence on many factors.
GMS is a key factor in the formation of cellular structures.
Surface tension during the foaming process—simply put, this is the effect produced when the blowing agent (such as butane or carbon dioxide) expands upon heating in the extruder. It is precisely during the critical expansion phase that the blowing agent ceases to flow, forming new cell walls and stretching the already formed cell walls.
GMS can reduce surface tension during the expansion process, thereby facilitating and enhancing the cell‑formation process (the gaseous structural element).
GMS affects the diffusion process, also known as “degassing.”
1) Increasing the GMS dosage can improve the foaming process.
However, high concentrations of GMS can migrate from the lower layer of the foam to the upper layer, impeding gas–air exchange and thereby prolonging the conditioning time of the coil in storage. Additionally, the foam structure may collapse (forming open cells), as the gases within the foam expand after production.
Furthermore, the high residual gas content in the foam structure and the elevated GMS concentration on the foam surface can adversely affect the quality of subsequent lamination.
2) Insufficient GMS concentration can also cause rapid gas release before the foam matures, leading to foam collapse.
Therefore, the GMS dosage is controlled through engineers’ expertise and continuous experimentation during the production process, ensuring that the concentration remains neither too high nor too low.
GMS reduces friction and static charge on the foam surface.
Reduce static charge on the foam surface during production—static charge can build up on the foam surface due to friction—thereby lowering the risk of fire.
Foam density (kg/m³) 3 ) and the lower the saturation or degree of vaporization, the greater GMS’s influence on these factors.
Many foam producers and manufacturers encounter a major challenge when producing ultra-light, low-density foams: during storage conditioning, the foam tends to shrink or expand rapidly, leading to bubble formation and surface rupture.
Apart from GMS, using various additives such as “Anticolaps” is of little practical value, since Anticolaps functions in exactly the same way as GMS.
The optimal dosage of GMS depends on numerous factors, including foam density, feed rate (kg/h), ambient temperature, ambient humidity, and diurnal temperature fluctuations.
Therefore, selecting the appropriate GMS dosage and concentration during the foaming process is crucial.
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