DESCRIPTION (COMPLETE)
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What is claimed is:
1. A polyethylene resin inner container for bag in
box, which is formed from a polyethylene resin comprising
an ethylene copolymer [A] having the following properties:
(i) the copolymer [A] is a copolymer of ethylene and an a-olefin of 3 to 20 carbon atoms;
(ii) the density is in the range of 0.880 to 0.960 g/cm3;
(iii) the melt flow rate (MFR, ASTM D 1238-65T, 190 °C, load of 2.16 kg) is in the range of 0.01 to 20 g/10 min; and
(iv) the temperature (Tm (°C) ) at the maximum peak position of the endothermic curve measured by a differential scanning calorimeter (DSC) and the density (d (g/cm3)) satisfy the following relation:
Tm < 400 x d - 250.
2. The polyethylene resin inner container for bag in
box as claimed in claim 1, wherein the ethylene copolymer
[A] is an ethylene/a-olefin copolymer obtained by copolymerizing ethylene and an a-olefin of 3 to 20 carbon atoms in the presence of a metallocene catalyst.
3. The polyethylene resin inner container for bag in
box as claimed in claim or claim 2, wherein the
polyethylene resin comprises 99 to 65 % by weight of the
ethylene copolymer [A] and 1 to 35 % by weight of a high-
pressure low-density polyethylene [D].
4. The polyethylene resin inner container for bag in
box as claimed in any of claims 1 to 3, wherein wall of
said inner ainer is formed from a film having a
thickness about 30 to about 1000 |lm, and having the
following properties:
(i) the blocking force is less than 1.0 g/cm;
(ii) the number of pinholes produced in an area of 20.5 cm x 28.0 cm after repeated torsion of 2,000 times is
applied to the film by means of a Gelbo flex tester is not more than 2/ and
(iii) the number of flexings, as measured in accordance with JIS P-8115, is not less than 90,000.
5. A reusable package for storing and transporting
fluent material, said package comprising
an outer, rigid container; and
a soft, thin-wall, flexible inner container within the outer container and capable of receiving and storing therein fluent material,
the wall of said inner container comprising a polyethylene resin film having a thickness of from about 30 to about 1000 |im, and characterized by
(i) a blocking force of less than 1.0 g/cm;
(ii) no more than 2 pinholes in an area of 20.5 cm x 28.0 cm after being repeatedly subjected for 2000 times to torsion in a Gelbo flex tester; and
(iii) not less than 90,000 flexings, before cracking, measured in accordance with JIS P-8115;
and wherein said inner container may, be repeatedly filled with fluent material and t '^d and folded upon itself without failure;
the wall of said polyethylene resin comprising an ethylene copolymer [A] having the following properties:
(i) the copolymer [A] is a copolymer of ethylene and an a-olefin of 3 to 20 carbon atoms;
(ii) the density is in the range of 0.880 to 0.960 g/cm3;
(iii) the melt flow rate (MFR, ASTM D 1238-65T, 190 °C, load of 2.16 kg) is in the range of 0.01 to 20 g/10 min; and
(iv) the temperature (Tm (°C) ) at the maximum peak position of the endothermic curve measured by a differential scanning calorimeter (DSC) and the density (d (g/cm3)) satisfy the following relation:
Tm < 400 x d - 250.
6. A method for repeatedly transporting fluent material using the same container, said method comprising
a) providing at a first location a folded thin walled flexible inner container comprising a polyethylene resin comprising an ethylene copolymer having
(i) the blocking force is less than 1.0 g/cm;
(ii) the number of pinholes produced in an area of 20.5 cm x 28.0 cm after repeated torsion of 2,000 times is
applied to the film by means of a Gelbo flex tester is not more than 2; and
(iii) the number of flexings, as measured in dance with JIS P-8115, is not less than 90,000; by unfolding the inner container and placing the inner container within a substantially rigid transportable outer container to thereby form a bag-in-box container;
c) filling the inner container with fluent material and securing the inner and outer containers in closed condition to prevent spillage of the fluent material stored within the inner container of the bag-in-box container,
d) transporting the filled bag-in-box container to a second location remote from the first location;
e) opening the outer the inner containers and emptying the fluent material from the inner container for use at said second location;
f) removing the emptied inner container from the outer container;
g) folding the inner container upon itself and transporting the folded inner container from the second location to the first location or to a third location, and
h) repeating steps b) - g);
whereby steps b) - g) may be repeated without replacing the flexible inner container.
7. A polyethylene resin inner container substantially as hereinbefore described with reference to the foregoing examples.
8. A reusable package substantially as hereinbefore described with reference to the foregoing examples.
9. A method for repeatedly transporting fluent material using the same container substantially as hereinbefore described with reference to the foregoing examples.