Foaming polyolefins | technical paper
Table 3: Foam density for 0.8 mm packaging sheet Grade
Regular grade 2202UMS
Table 5: Average cell size Grade
Regular 2202UMS
End density (kg/m3 20 18
)
Table 4: Foam density for 11 mm packaging sheet Grade
Regular grade 2202UMS
End density (kg/m3 22 20
)
Average cell size (mu) 2370 2250
This is done to make the cells comparable with the starting product (Note: this finer cell structure differs from lab-trials with stearamide, where slightly larger cells were seen). After adjusting the formulation, the settings need to be further optimized to create a stable production. Because of the lower product density, another
important side effect was noticed, namely an increase of the line speed. While running for a longer period with 2202UMS, it
also became evident that in most cases the number of web breaks on a sheet foam extrusion line was reduced
Min. (mu) 1300 1180
Max. (mu) 3425 3233
Foam density (kg/m3 22 20
compared to the regular grade. So 22002UMS offers the following opportunities to
improve production efficiency in practice: a density reduction of approximately 5-15%; an increase of the line speed of approximately 3-13%; and, a reduction in web breaks, especially for sheet foam products with relatively thin thickness between 0.5 and 3.0 mm
Improving product quality The finer cell structure obtained with 2202UMS also gives opportunities in building and construction applica- tions where cell structure influences the thermal
)
Polymers
Conductive Carbon Black • electrical conductivity • easy-dispersion
• high purity For electronic packaging, fuel hoses, fl ooring, power cables and accessories, conveying belts, ATEX applications.
www.timcal.com
Graphite & Coke • thermal conductivity • electrical conductivity
• lubrication For seals, water-meters, heat sinks, geothermal pipes, LED light sockets, primers for electrostatic painting, gas barrier properties.
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