Linear low-density polyethylene (LLDPE) is a new type of polyethylene resin
which was produced by Du Pont in Canada in the late 1950s and industrialized in the late 1970s. It is a third-generation polyethylene resin with both high-density polyethylene (HDPE) and low-density polyethylene (LDPE) properties. Many properties of LLDPE resin, such as tensile strength, environmental stress cracking resistance and melting temperature range, are superior to LDPE resin. Therefore, cross-linked LLDPE foam is a new type of polyolefin foam product, which has better physical and mechanical properties than LDPE and HDPE foam products. Compared with LDPE melt, due to the low tensile viscosity of LLDPE melt, poor temperature sensitivity of melt viscosity, and higher melt viscosity under high shear, the LLDPE foaming process is more difficult to control and requires cross-linking foaming. The process obtains ideal foamed products. When the ratio of polyethylene foam is 5 times, its tensile strength can reach 1.60MPa, and its elongation at break can reach 236%.