	US 11,718,069 B2
	Composite film for coating steel pipe and method of manufacturing same
Sung Man Jung, Gwangyang-si (KR); Heung Dae Kim, Suncheon-si (KR); Jong Min Jeong, Anyang-si (KR); Kye Sung Cho, Suncheon-si (KR); and Seung Gwan Lim, Suncheon-si (KR)
Assigned to FIXON INC., Gwangyang-si (KR)
Filed by FIXON INC., Gwangyang-si (KR)
Filed on Jun. 28, 2022, as Appl. No. 17/851,971.
Claims priority of application No. 10-2021-0112824 (KR), filed on Aug. 26, 2021.
Prior Publication US 2023/0084163 A1, Mar. 16, 2023
Int. Cl. B32B 15/085 (2006.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); B32B 5/02 (2006.01); B29C 48/08 (2019.01); B29C 48/00 (2019.01); B29C 48/88 (2019.01); B32B 37/12 (2006.01); B32B 15/18 (2006.01); B29K 23/00 (2006.01)

CPC B32B 15/085 (2013.01) [B29C 48/022 (2019.02); B29C 48/08 (2019.02); B29C 48/9135 (2019.02); B32B 5/024 (2013.01); B32B 15/18 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 37/12 (2013.01); B29K 2023/065 (2013.01)]

13 Claims

1. A composite film for surface protection and reinforcement of a steel member, the composite film comprising:

a first film layer attached to a surface of a steel member;

a second film layer positioned on the first film layer; and

a mesh film layer having a mesh structure and positioned on the second film layer,

wherein the first film layer is made from a first polymer mixture comprising 50 to 85 wt % of a linear low density polyethylene (LLDPE) 12 to 45 wt % of maleic anhydride, and 2 to 5 wt % of masterbatch,

the second film layer is made from a second polymer mixture comprising a linear low density polyethylene (LLDPE),

the mesh film layer is formed by weaving synthetic resin yarns containing a high density polyethylene (HDPE) and 0.12 to 1.42 wt % of an inorganic filler,

the mesh film layer is partially embedded into the second film layer during a heat compression process when the composite film is manufactured, and

the inorganic filler of the mesh film layer is a stone powder having an average particle size of 10 to 90 μm.