Film, method of producing film, and bag
Provided are a film having an excellent balance between heat seal strength and opening strength, a method of producing the film, and a bag obtained by heat-sealing the film. According to the present invention, there is provided a film containing a resin, wherein a resin density of the film is 860 kg/m 3 or more and less than 900 kg/m 3 , and on at least one surface of the film, an arithmetic mean height Sa satisfies the following Expression [1]: 0.10 μm≤Sa≤0.50 μm [1], and a minimum autocorrelation length Sal satisfies the following Expression [2]: 0.2 μm≤Sal≤10.4 μm [2].
1. A film comprising a resin,
wherein a resin density of the film is 860 kg/m 3 or more and less than 900 kg/m 3 , and
on at least one surface of the film, an arithmetic mean height Sa satisfies the following Expression [1]:
0.10 μm≤Sa≤0.50 μm [1], and
a minimum autocorrelation length Sal satisfies the following Expression [2],
0.2 μm≤Sal≤10.4 μm [2].
2. The film according to claim 1 , wherein an arithmetic mean height Sa on the at least one surface of the film satisfies the following Expression [1′]:
0.10 μm≤Sa≤0.20 μm[1′].
3. The film according to claim 2 , wherein a minimum autocorrelation length Sal on the at least one surface of the film satisfies the following Expression [2′]:
7.0 μm≤Sal≤10.4 μm [2′].
4. The film according to claim 3 , wherein a resin density of the film is 890 kg/m 3 or more and less than 900 kg/m 3 .
5. The film according to claim 4 , wherein the resin is a mixture of
an ethylene-α-olefin copolymer (1) having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, having a density of 915 kg/m 3 or more and 950 kg/m 3 or less, and having a melt flow rate of 0.0001 g/10 min or more and 0.2 g/10 min or less measured under conditions of a temperature of 190° C. and a load of 21.18 N, and
an ethylene-α-olefin copolymer (2) having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, having a density of 850 kg/m 3 or more and less than 890 kg/m 3 , and having a melt flow rate of 0.1 g/10 min or more and 10 g/10 min or less measured under conditions of a temperature of 190° C. and a load of 21.18 N.
6. The film according to claim 3 , wherein the resin is a mixture of
an ethylene-α-olefin copolymer (1) having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, having a density of 915 kg/m 3 or more and 950 kg/m 3 or less, and having a melt flow rate of 0.0001 g/10 min or more and 0.2 g/10 min or less measured under conditions of a temperature of 190° C. and a load of 21.18 N, and
an ethylene-α-olefin copolymer (2) having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, having a density of 850 kg/m 3 or more and less than 890 kg/m 3 , and having a melt flow rate of 0.1 g/10 min or more and 10 g/10 min or less measured under conditions of a temperature of 190° C. and a load of 21.18 N.
7. The film according to claim 1 , wherein a minimum autocorrelation length Sal on the at least one surface of the film satisfies the following Expression [2′]:
7.0 μm≤Sal≤10.4 μm [2′].
8. The film according to claim 1 , wherein a resin density of the film is 890 kg/m 3 or more and less than 900 kg/m 3 .
9. The film according to claim 1 , wherein the resin is a mixture of an ethylene-α-olefin copolymer (1) having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, having a density of 915 kg/m 3 or more and 950 kg/m 3 or less, and having a melt flow rate of 0.0001 g/10 min or more and 0.2 g/10 min or less measured under conditions of a temperature of 190° C. and a load of 21.18 N, and
an ethylene-α-olefin copolymer (2) having a monomer unit based on ethylene and a monomer unit based on an α-olefin having 3 to 20 carbon atoms, having a density of 850 kg/m 3 or more and less than 890 kg/m 3 , and having a melt flow rate of 0.1 g/10 min or more and 10 g/10 min or less measured under conditions of a temperature of 190° C. and a load of 21.18 N.
10. The film according to claim 9 ,
wherein a density of the ethylene-α-olefin copolymer (1) is 920 kg/m 3 or more and 935 kg/m 3 or less, and a melt flow rate of the ethylene-α-olefin copolymer (1) measured under conditions of a temperature of 190° C. and a load of 21.18 N is 0.001 g/10 min or more and 0.01 g/10 min or less, and
a density of the ethylene-α-olefin copolymer (2) is 880 kg/m 3 or more and less than 890 kg/m 3 , and a melt flow rate of the ethylene-α-olefin copolymer (2) measured under conditions of a temperature of 190° C. and a load of 21.18 N is 1 g/10 min or more and 5 g/10 min or less.
11. The film according to claim 10 ,
wherein a content of the ethylene-α-olefin copolymer (1) and a content of the ethylene-α-olefin copolymer (2) are 5% by mass or more and 25% by mass or less and 75% by mass or more and 95% by mass or less, respectively,
with respect to a total of 100% by mass of the content of the ethylene-α-olefin copolymer (1) and the content of the ethylene-α-olefin copolymer (2).
12. The film according to claim 9 ,
wherein a content of the ethylene-α-olefin copolymer (1) and a content of the ethylene-α-olefin copolymer (2) are 5% by mass or more and 25% by mass or less and 75% by mass or more and 95% by mass or less, respectively,
with respect to a total of 100% by mass of the content of the ethylene-α-olefin copolymer (1) and the content of the ethylene-α-olefin copolymer (2).
13. A bag obtained by heat-sealing the film according to claim 1 .