The three layers co-extrusion skin-foam-skin insulation structure due to its excellent electrical property

such as lower dielectric constant

smaller attenuation and dissipation factor

higher insulation resistance

lower cost

is widely used in signal cable

communication cable and photoelectric integrated cable. But the stability of the structure and performance are influenced by its weak compressive property of the physical foaming structure. The compressive property can be improved by adjusted material ratio and technological parameter

different material composition impact on the foaming degree and the uniformity of pore

which can be improved by increasing the proportion of HDPE and nucleating agent

respectively. The maximum compressive strength can be achieved about 1000 N. The compressive strength of insulation wire can be improved largely by those of manners

which promote this insulation structure’s practical application in actual product.