MULTILAYER SEALING FILM AND LAMINATED FILM MATERIAL WITH MULTILAYER SEALING FILM Russian patent published in 2019 - IPC B32B3/30 C08J5/16 B32B27/32 C08J5/18 B29C59/02 B65D65/40 

FIELD: manufacturing technology.

SUBSTANCE: invention relates to a multilayer sealing film made from heat-sealing polymer, in particular from polyolefin or mixture with polyolefin, wherein on first side (15) of sealing film (10) at least locally introduced are surface structures (14) to increase compressibility of sealing film (10) in region of surface structures (14), wherein the sealing film before the introduction of surface structures has a thickness (D) in range of 10 mcm to 100 mcm, wherein the sealing film does not contain an antifriction additive, or the sealing film contains an antifriction additive in an amount which provides a value of the parameter S, which is calculated as a sum of parameters S of separate layers of the multilayer sealing film, defined as the product of the thickness of one layer on the content of the antifriction additive in ppm in the layer, less than 10,000. Introduction of surface structures, maximum transverse length (b₁, b₂) of which is less than 500 mcm enables to achieve on the side having surface structures a dynamic friction coefficient on steel of less than 0.3, and a static friction coefficient of less than 0.35.

EFFECT: proposed multilayer sealing film and laminated film material with multilayer sealing film.

19 cl, 12 dwg, 2 tbl