Process for making ethylenic polymer foam structures

(57) The ethylene system polymeric foam structure containing summary ethylene system polymer material is indicated. Molecular-weight-distribution Mw/Mn as which this ethylene system polymeric foam material is specified by a melt flow ratio l/l>=5.62 and b type Mw/Mn<= (l/l) *4.63, And ethylene system polymer of a line substantially which has a critical shear rate at the time of the start of surface-melting destruction bigger at least 50% than the critical shear rate at the time of the start of the surface-melting destruction of line olefin polymer which has l and Mw/Mn same in c abbreviation is included. This foam structure object has the same usual toughness and elasticity as the foam structure object by which LLDPE formation was carried out, without having the low quality and the low dimensional stability of the form related to such structures. Although this foam structure object has the quality of the same form as the usual LDPE, it has the toughness and elasticity which improved. The method of manufacturing the method and it which manufacture the above-mentioned foam structure object in the state of a form bead is also indicated.