Bi-directionally oriented multilayer film

A multilayer film comprising:

• an inner layer system comprising a first surface and a second surface;
• a first skin layer bound to the inner layer system at the first surface of the inner layer system;
• and
• a second skin layer bound to the inner layer system at the second surface of the inner layer system;
• wherein
• the inner layer system consists of a polymer formulation (A) comprising:
• ≥60.0 and ≤90.0 wt % of a first ethylene-based polymer being a linear low-density polyethylene A (LLDPE A);
• and ≥10.0 and ≤40.0 wt %, of a high-density polyethylene (HDPE) having a density of ≥940 and ≤970 kg/m3, as determined in accordance with ASTM D792 (2008);
• and
• at least one or both of the first or the second skin layer(s) is a sealing layer comprising a second ethylene-based polymer being a linear low-density polyethylene B (LLDPE B) comprising polymeric moieties derived from ethylene and from 1-hexene or 1-octene, having a density of ≥890 and ≤915 kg/m3, as determined in accordance with ASTM D792 (2008);
• wherein the multilayer film is a bi-directionally oriented film wherein the orientation in both directions is introduced in the solid state,
• wherein the second ethylene-based polymer has:
• a melt mass-flow rate of ≤0.5 and ≤5.0 g/10 min, as determined in accordance with ASTM D1238 (2013) at a temperature of 190° C. under a load of 2.16 kg;
• a fraction that is eluted in analytical temperature rising elution fractionation (a-TREF) at a temperature ≤30.0° C. of ≤8.0 wt %, with regard to the total weight of the second ethylene-based polymer;
• a fraction eluted in a-TREF at a temperature of >30° C. and <94.0° C. of ≥90.0 wt %, with regard to the total weight of the second ethylene-based polymer;
• and/or
• a chemical composition distribution broadness (CCDB) of ≥5.0 and ≤25.0.