PACKAGING MATERIAL FILM AND PACKAGING MATERIAL, PACKAGING BAG, AND PACKAGING COMPRISING SAME
A packaging material film according to the present disclosure includes a first resin layer that contains a polyolefin resin and a porous filler. A ratio Y/X of an average particle size Y μm of the porous filler to a thickness X μm of the first resin layer is 0.02 to 3.5, and a content percentage of the porous filler in the first resin layer is 0.5 to 30 mass %. A packaging material according to the present disclosure includes a substrate and a packaging material film disposed on the substrate. In the packaging material, the packaging material film is formed of the above packaging material film, and a surface of the first resin layer of the packaging material film on a side opposite from the substrate is exposed.
1 . A packaging material film comprising a first resin layer that contains a polyolefin resin and a porous filler,
wherein a ratio Y/X of an average particle size Y μm of the porous filler to a thickness X μm of the first resin layer is 0.02 to 3.5, and
a content percentage of the porous filler in the first resin layer is 0.5 to 30 mass %.
2 . The packaging material film according to claim 1 , wherein the porous filler has an oil absorption of 100 to 380 mL/100 g.
3 . The packaging material film according to claim 1 , wherein a surface of the first resin layer has an arithmetical mean roughness Sa of 2.0 μm or less.
4 . The packaging material film according to claim 1 , wherein the porous filler has an average particle size of 5 μm or more.
5 . The packaging material film according to claim 1 , wherein the porous filler has a main portion and a cover portion covering at least a part of a surface of the main portion, and the cover portion is composed of a hydrophobic material.
6 . The packaging material film according to claim 1 , wherein the first resin layer further contains at least one additive selected from the group consisting of an elastomer composed of a block copolymer of polypropylene and polyethylene, a polypropylene-based elastomer, and a polyethylene-based elastomer.
7 . A packaging material comprising:
a substrate; and
a packaging material film disposed on the substrate,
wherein the packaging material film comprises the packaging material film according to claim 1 , and
a surface of the first resin layer of the packaging material film on a side opposite from the substrate is exposed.
8 . A packaging bag for storing oil-in-water-dispersed contents,
wherein the packaging bag is formed using the packaging material according to claim 7 , and the first resin layer is arranged on an inner side.
9 . A packaging body comprising:
the packaging bag according to claim 8 ; and
oil-in-water-dispersed contents enclosed in the packaging bag.