U.S. patent application number 11/066196 was filed with the patent office on 2005-09-01 for transport tank and transporting method thereof.
This patent application is currently assigned to Fuji Photo Film Co., Ltd.. Invention is credited to Moizumi, Yoshitsugu.
Application Number | 20050189357 11/066196 |
Document ID | / |
Family ID | 34747586 |
Filed Date | 2005-09-01 |
United States Patent
Application |
20050189357 |
Kind Code |
A1 |
Moizumi, Yoshitsugu |
September 1, 2005 |
Transport tank and transporting method thereof
Abstract
A transport inner bag and a pressure inner bag are loaded in a
tank body of a tank container. A supply-discharge opening for the
transport inner bag is provided in a position corresponding to a
tank supply-discharge opening, and cargo is filled through the
opening. A supply-discharge opening for the pressure inner bag is
provided in a position corresponding to a hatch of the tank body,
and air is filled through the opening to expand the pressure inner
bag, so that a space between the transport inner bag and an inner
surface of the tank body is filled as well as the gap in between.
This prevents the transport inner bag from moving in the tank body
in transporting in a state that the cargo is not fully loaded in
the transport inner bag, so that the breakage of the transport
inner bag caused by the movement is prevented.
Inventors: |
Moizumi, Yoshitsugu;
(Shizuoka, JP) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
Fuji Photo Film Co., Ltd.
|
Family ID: |
34747586 |
Appl. No.: |
11/066196 |
Filed: |
February 25, 2005 |
Current U.S.
Class: |
220/562 |
Current CPC
Class: |
B65D 90/046 20130101;
B65D 88/128 20130101; B65D 2590/046 20130101 |
Class at
Publication: |
220/562 |
International
Class: |
B65D 088/00 |
Foreign Application Data
Date |
Code |
Application Number |
Feb 27, 2004 |
JP |
2004-055305 |
Claims
What is claimed is:
1. A transport tank having a tank body and a first inner bag to be
loaded inside of said tank body removably, said first inner bag
having a second supply-discharge opening to be fitted in a first
supply-discharge opening of said tank body for loading a cargo,
said transport tank comprising: at least one second inner bag,
disposed between said first inner bag containing said cargo and an
inner surface of said tank body, to expand by filling of filler for
holding said cargo to prevent said first inner bag from moving in
said tank body during transportation.
2. A transport tank as claimed in claim 1, wherein said first and
second inner bags are made from a synthetic resin.
3. A transport tank as claimed in claim 2, wherein said cargo is
put into said first inner bag after or while pre-filling said
filler in said second inner bag.
4. A transport tank as claimed in claim 3, wherein size of said
second inner bag adapts to an amount of said cargo.
5. A transport tank as claimed in claim 3, wherein said second
inner bag has the same capacity as said tank body and expands when
said cargo is discharged from said first inner bag.
6. A transport tank as claimed in claim 5, wherein said filler is
any of gasses, liquids or powder and granular materials.
7. A transporting method for transporting cargo by use of a first
inner bag to be loaded inside of a tank body removably, said first
inner bag having a second supply-discharge opening to be fitted in
a first supply-discharge opening of said tank body for loading said
cargo, said transporting method comprising the step of: expanding
at least one second inner bag, which is disposed between said first
inner bag containing said cargo and an inner surface of said tank
body, by filling of filler for holding said cargo to prevent said
first inner bag from moving in said tank body during
transportation.
8. A transporting method as claimed in claim 7, wherein said first
and second inner bags are made from a synthetic resin.
9. A transporting method as claimed in claim 8, wherein said cargo
is put into said first inner bag after or while pre-filling said
filler in said second inner bag.
10. A transporting method as claimed in claim 9, wherein size of
said second inner bag adapts to an amount of said cargo.
11. A transporting method as claimed in claim 9, wherein said
second inner bag has the same capacity as said tank body and
expands when said cargo is discharged from said first inner
bag.
12. A transporting method as claimed in claim 11, wherein said
filler is any of gasses, liquids or powder and granular materials.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a transport tank to be
transported with containing a cargo in a transport inner bag, and
more specifically, a transport tank having a pressure inner bag for
preventing the transport inner bag from moving in a tank body of
the transport tank during transportation, and transporting method
thereof.
[0003] 2. Description of the Prior Arts
[0004] In cargo transportation by sea, railroad, road and so forth,
a tank container is generally used for liquid materials (cargo). As
the tank container, a 20 foot container (hereinafter referred to as
a tank container) which conforms to the ISO Standards is ordinarily
used, for example. The tank container has 20 foot length, 8 foot
width, and 8 foot height, so that about 20 tons of liquid can be
filled therein.
[0005] In the container transportation to use this kind of tank
container, it is necessary to wash the inside of the tank after
transportation, and in addition, to produce the tank by using a
high quality stainless steel plate with chemical resistance. In
order to solve the problems, Japanese Patent Laid-Open Publication
No. S61-104983 discloses that an inner bag or liner bag made of
soft synthetic resin to have the chemical resistance is loaded in
the tank produced from the general steel plate. In addition,
Japanese Patent Laid-Open Publication No. 2001-354292, Japanese
Utility-Model Laid-Open Publication No. S61-48190, Japanese Patent
Laid-Open Publication No. S50-4615, and Japanese Utility-Model
Laid-Open Publication No. S57-46492 also disclose to load the inner
bag in the tank in order to save the trouble for washing the inside
of the tank.
[0006] However, with respect to the prior art inner bag to be used
in the tanks and tank containers, it is so difficult to produce
appropriate inner bags for large tanks including the 20 foot
container that there has no practical application. Namely, it has
been difficult to produce the inner bag fitting in the cylindrical
20 foot container easily and affordably. The ideal inner bag to fit
within the tank container properly would be a cylindrical-shaped
inner bag having approximately the same shape as the tank
container. However, it is necessary to prepare circular lid films,
and in addition, to weld the circular lid films on both ends of a
tubular film. To make matters worse, since the circular lid film
has to be welded not in a two-dimensional direction, but in a
three-dimensional direction, the exclusive guide apparatus for
welding the circular lid film is required.
[0007] In contrast, an envelope type inner bag is easily produced
only by welding the both ends of the tubular film. This type of
inner bag prevents the liquid from directly contacting with the
inside of the tank by joining supply-discharge openings of the
inner bag and the tank. Therefore, changing the inner bag makes it
unnecessary to wash the inside of the tank.
[0008] However, the following problem occurs in process of
developing the above-mentioned inner bag. The inner bag may move
during transportation and the movement varies depending on whether
the inner bag is in an approximately fully loaded condition where
an amount of the cargo reaches the transport tank volume or it is
in a non-fully loaded condition. Namely, if the tank is transported
in the non-fully loaded condition, the cargo moves in the inner
bag, and at the same time, the inner bag moves in the tank.
Consequently, the inner bag may be ruptured, the supply-discharge
opening may crack, or the cargo may not be discharged due to twist
or inversion of the inner bag. Accordingly, some kind of measure
has been required.
SUMMARY OF THE INVENTION
[0009] An object of the present invention is to provide a transport
tank in which a transport inner bag hardly moves if the transport
tank is transported with the transport inner bag which is not fully
loaded with a cargo, and a transporting method thereof.
[0010] In order to achieve the above object, at least one second
inner bag is disposed between a first inner bag containing a cargo
and an inner surface of the tank body. The second inner bag will
expand by filling of filler for holding the cargo to prevent the
first inner bag from moving in said tank body during
transportation.
[0011] According to the preferred embodiment of the present
invention, the first and second inner bags are made from a
synthetic resin. The cargo is any of gasses, liquids, and powder
and granular materials, which is put into the first inner bag after
or while pre-filling the filler in the second inner bag. Although
the size of the second inner bag adapts to the amount of the cargo,
if the second inner bag has the approximately same size as the tank
body, it expands when the cargo is discharged from the first inner
bag.
[0012] According to the present invention, the second inner bag
will expand by the filler to prevent the first inner bag from
moving in the tank body during transportation, so that it is
possible to settle such drawbacks as the breakage of the first
inner bag due to the movement or the discharge failure of the cargo
due to twist or inversion of the cargo during the transportation of
the first inner bag which is not fully loaded with the cargo. In
addition, a specific amount of the filler is preliminarily filled
in the second inner bag to arrange the shape of the second inner
bag before or while containing the cargo in the first inner bag, so
that the folded second inner bag is not sandwiched between the
first inner bag and the inner surface of the tank body when the
cargo is put into the first inner bag. Therefore, it is possible to
prevent the filling failure due to the sandwiched portion at the
time of filling the filler in the second inner bag or to prevent
the second inner bag from being ruptured.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The above and other subjects and advantages of the present
invention will become apparent from the following detailed
description of the preferred embodiments when read in association
with the accompanying drawings, which are given by way of
illustration only and thus are not limiting the present invention.
In the drawings, like reference numerals designate like or
corresponding parts throughout the several views, and wherein:
[0014] FIG. 1 is a front view of a tank container having a
transport tank to which the present invention is applied;
[0015] FIG. 2A is an explanatory view of the size of a transport
inner bag fitting in a tank body of the transport tank, wherein a
plan view of the tank body and the transport inner bag is
shown;
[0016] FIG. 2B is an explanatory view of the size of the transport
inner bag fitting in the tank body, wherein a longitudinal
cross-sectional surface of the tank body in a longitudinal
direction is shown;
[0017] FIG. 2C is an explanatory view of the size of the transport
inner bag fitting in the tank body, wherein a longitudinal
cross-sectional surface of the tank body in a width direction is
shown;
[0018] FIGS. 3A, 3B, 3C and 3D are schematic perspective views
showing procedure for producing the transport inner bag;
[0019] FIG. 4 is a plan view of a pressure inner bag;
[0020] FIG. 5 is a cross-sectional view, partly in section, showing
a filler supply-discharge opening, a connector and a connecting
hose of the pressure inner bag;
[0021] FIG. 6 is a flow chart showing the procedure for producing
the transport inner bag;
[0022] FIG. 7 is an explanatory view showing procedure for welding
an inner bag supply-discharge opening;
[0023] FIG. 8 is a cross-sectional view showing a state where an
inner bag supply-discharge opening is attached to a tank
supply-discharge opening;
[0024] FIG. 9A is a perspective view showing process for welding
one end of a tubular film;
[0025] FIG. 9B is a perspective view showing process for venting
air from the tubular film;
[0026] FIG. 9C is a perspective view showing process for welding
the other end of the tubular film after the air venting;
[0027] FIG. 10A is an enlarged plan view showing a welding line of
the inner bag body, wherein the inner and outer tubular films are
thermally welded all together into four layer;
[0028] FIG. 10B is an enlarged plan view showing the welding line
of the inner bag body, wherein the inner and outer tubular films
are thermally welded all together into four layer after the end of
the inner tubular film have been thermally welded into two
layer;
[0029] FIG. 10C is an enlarged plan view showing the weld line of
the inner bag body, wherein the ends of the inner and outer tubular
films are thermally welded together into two layer; and
[0030] FIGS. 11A, 11B, 11C, 11D and 11E are explanatory views
showing process for folding the transport inner bag to contain it
in a packaging bag.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0031] In FIG. 1, a twenty-foot ISO container 10 is constituted of
a tank body 11 and a rectangular parallelepiped frame 12 for
holding the tank body 11. A hatch 13 is formed at the top face of
the tank body 11. The maintenance and filling of liquid are
performed through the hatch 13. At the time of transporting, a lid
14 is locked by a locking member in order to prevent the lid 14
covering the hatch 13 from opening. A tank supply-discharge opening
15 is formed in one end of a lower portion of the tank body 11. A
foot valve 16 is fixed through a flange 15a of the tank
supply-discharge opening 15.
[0032] A transport inner bag 20 is loaded in a lower portion of the
tank body 11, while a pressure inner bag 19 is loaded in an upper
portion thereof. These inner bags 19, 20 are brought into the tank
body 11 from the hatch 13 by an operating person to set in the tank
body 11. The transport inner bag 20 upswells in the tank body 11 by
pouring the liquid as cargo therein from the tank supply-discharge
opening 15 through the foot valve 16, so that the transport inner
bag 20 operates as a lining to the tank body 11. In addition, the
pressure inner bag 19 is filled with air supplied through a filling
hose 17 and a filler supply-discharge opening 18, and presses the
transport inner bag 20 against the tank body 11, thus, the
transport inner bag 20 hardly moves during transportation. As the
transport inner bag 20 stands still in the tank body 11 against the
movement of the liquid in transporting, the transport inner bag 20
is not ruptured.
[0033] As shown in FIG. 2A, the transport inner bag 20 is
constituted of an inner bag body 21 having an envelope shape and an
inner bag supply-discharge opening 22 to be fitted in the tank
supply-discharge opening 15. Since the transport inner bag 20 is
formed to the envelope shape, the inner bag body 21 can be easily
formed as shown in FIGS. 3A-3D. In FIG. 3B, a tubular film 23 is
cut into a predetermined length after being drawn from a film roll
24 which is the roll of the tubular film 23, and then both end
portions 23a and 23b of the tubular film 23 are closed by thermally
welding or the like (see FIGS. 9A and 9C).
[0034] In FIG. 2A, a longitudinal cross-sectional surface including
a central line CL1 extending in the longitudinal direction of the
tank body 11 (B-B arrowed cross-section) is referred to as a
longitudinal cross-sectional surface in the longitudinal direction,
while a longitudinal cross-sectional surface including a central
line CL2 extending in the width direction of the tank body 11 (C-C
arrowed cross-section) is referred to as a longitudinal
cross-sectional surface in the width direction. A line CL3 shown in
FIG. 2B is a central line extending in a height direction of the
tank body 11.
[0035] The tank body 11 is formed to a tubular shape whose both
ends are closed to be placed transversally, while the transport
inner bag 20 is formed to the envelope shape. Therefore, if the
transport inner bag 20 is smaller than the appropriate size
corresponding to the size of the tank body 11, a predetermined
filling capacity is not ensured. To make matters worse, the smaller
inner bag creates a gap between the inner peripheral surface of the
tank body 11 and the transport inner bag 20 where the transport
inner bag 20 together with the liquid can move to damage the welded
portion of the inner bag supply-discharge opening 22 and the welded
lines of the both ends of the transport inner bag 20. Whereas, if
the transport inner bag 20 is larger than the appropriate size
corresponding to the size of the tank body 11, the raw material of
the transport inner bag 20 is wasted. Moreover, if an extra portion
such as the end portion of the transport inner bag 20 is under the
liquid filled in the transport inner bag 20, the extra portion is
sandwiched between the inner bag body 21 filled with the liquid and
the peripheral surface of the tank body 11 due to the weight of the
liquid. As a result, it becomes impossible to fill liquid
furthermore. If the liquid is kept filled while the extra portion
is sandwiched, the internal pressure of the transport inner bag 20
rises to possibly damage the transport inner bag 20.
[0036] In the present embodiment, the size of the envelope type
transport inner bag 20 is limited within a specific range based on
the size of the tank body 11 for the purpose of preventing the
filling failure and the damage of the transport inner bag 20. When
the length of the transport inner bag 20 is IL, the width thereof
is IW, the inner peripheral length (first inner peripheral length)
of the tank body 11 in the longitudinal cross-sectional surface in
the longitudinal direction is TLt, and the inner peripheral length
(second inner peripheral length) of the tank body 11 in the
longitudinal cross-sectional surface in the width direction is TLr,
the following conditions are satisfied:
[0037] 0.47 TLt.ltoreq.IL.ltoreq.0.6.multidot.TLt; and
[0038] 0.47 TLr.ltoreq.IW.ltoreq.0.6.multidot.TLr.
[0039] IL and IW preferably satisfy the following conditions:
[0040] 0.49 TLt.ltoreq.IL.ltoreq.0.55 TLt; and
[0041] 0.49 TLr.ltoreq.IW.ltoreq.0.58 TLr.
[0042] As above-mentioned, the size of the transport inner bag 20
is limited based on the inner peripheral length of the tank body
11, so that the tank body 11 may have different shapes than tube
such as an elliptical shape or others.
[0043] The inner bag supply-discharge opening 22 is provided on the
central line extending in the longitudinal direction at a position
apart from one end of the transport inner bag 20 by the distance
L1=1750 mm or adjacent thereto. The distance L1 is limited within a
range 0.44.multidot.IW.ltoreq.L1.ltoreq.0.50.multidot.IW based on
the width IW of the transport inner bag 20, so that it is possible
to position the central positions in the longitudinal direction of
the tank body 11 and the transport inner bag 20 with each other if
the transport inner bag 20 is attached to the tank body 11 with
reference to the tank supply-discharge opening 15, which is formed
in the end of the lower portion of the tank body 11. Thereby, the
extra portions in both ends of the transport inner bag 20 can be
distributed approximately evenly in the tank body 11. Accordingly,
the extra portion of the transport inner bag 20 dose not build up
on one side to be sandwiched between the tank body 11 and the inner
bag body 21, so that the filling failure and the damage of the
transport inner bag 20 are eliminated.
[0044] As shown in FIG. 4, the pressure inner bag 19 is constituted
of an inner bag body 19a having an envelope shape and a filler
supply-discharge opening 18. Although the pressure inner bag 19 is
formed into the envelope shape having the same size as the
transport inner bag 20 shown in FIG. 2, since the liquid as the
cargo is not filled in the pressure inner bag 19 unlike the
transport inner bag 20, the pressure inner bag 19 has a
single-layer structure, and in addition, has the filler
supply-discharge opening 18 instead of the inner bag
supply-discharge opening 22.
[0045] As shown in FIG. 5, the filler supply-discharge opening 18
is constituted of a cylindrical body 18a made of a synthetic resin.
A welding flange portion 18b is formed in an end of the filler
supply-discharge opening 18, while an attachment female screw 18c
is formed in an inner peripheral surface of the other end. A bottom
attachment screw 51a of a hose connector 51 having a valve 50 is
screwed into the filler supply-discharge opening 18 through the
attachment female screw 18c. A hose connection opening 51b and a
cap attachment screw 51c are formed above the hose connector
51.
[0046] The hose connection opening 51b uses a snap type connection
to hold the end of the hose removably. The valve 50 is closed by
rotating a handle 50a at the time of removing the filling hose 17
from the hose connector 51. After removing the filling hose 17, a
cap 52 is fitted in the cap attachment screw 51c. Note that a screw
type of the hose connection opening may be used instead of the snap
type. In addition, with regard to the shape and structure of the
filler supply-discharge opening 18, the valve 50 and the hose
connector 51 and the attaching method for them, various embodiments
may be applied to the present invention. Moreover, the pressure
inner bag 19 may be formed in a multilayer structure to have two or
more layers.
[0047] Next, the procedure for producing the transport inner bag
20, which is shown in FIG. 6, is explained. As shown in FIGS. 3A
and 3B, the tubular film 23 is drawn from the film roll 24 to be
put on a work table 25, and then cut into the length IL by a cutter
26 or the like. The tubular film 23 is made from LLDPE (linear low
density polyethylene), and wound into a roll shape to be stored.
Since the transport inner bag 20 is doubled in the present
embodiment, it is necessary to form the two tubular films 23 by
cutting the tubular film 23 twice into the length IL. The transport
inner bag 20 of the present invention is used for the 20 foot
container, so that the first inner peripheral length
TLt.apprxeq.15500 mm, and the second inner peripheral length
TLr.apprxeq.7100 mm, while IL=8300 mm and IW=3900 mm based on the
above-mentioned appropriate size range. The thickness of a single
layer of the tubular film 23 is 120 .mu.m. Since the tubular film
23 of the present embodiment has two layers, the entire thickness
of the tubular film 23 is 240 .mu.m. The thickness of the film is
preferably 80-500 .mu.m, especially 100-300 .mu.m.
[0048] As shown in FIG. 3C, in doubling the tubular film 23, one
tubular film is inserted into another tubular film. Subsequently,
as shown in FIG. 3D, a hole 27 corresponding to the inner bag
supply-discharge opening 22 is opened on only the upper two layers
of films by a punch or a cutter. The inner bag supply-discharge
opening 22 is located at the center in the width direction and
apart from other end portion 23b by the distance L1=1750 mm.
[0049] As shown in FIG. 7, when the inner bag supply-discharge
opening 22 is attached to the inner bag body 21, the opening 22 is
thermally welded to a peripheral edge of the hole 27. At this time,
only the upper two layers of the films are thermally welded. The
inner bag supply-discharge opening 22 is constituted of a
supply-discharge mouth 22a having a truncated conical and
cylindrical shape, a welding flange 22b and an attachment flange
22c which are attached to both the ends of the supply-discharge
mouth 22a, and integrally formed by using LLDPE for example. The
welding flange 22b and the inner bag body 21 are thermally welded
by a thermal welding apparatus (not shown) to form welding lines 28
and 29. As shown in FIG. 8, when the inner bag supply-discharge
opening 22 is inserted to the tank supply-discharge opening 15 from
the inside of the tank, the attachment flange 22c protrudes outside
the flange 15a of the tank supply-discharge opening 15 to be fixed
firmly to the flange 15a.
[0050] As shown in FIG. 8, an attachment flange 30a of an inner bag
suction preventing member 30 and the foot valve 16 are attached to
the flange 15a of the tank supply-discharge opening 15, so that the
inner bag supply-discharge opening 22 is attached firmly to the
tank supply-discharge opening 15. The supply-discharge mouth 22a is
formed along the inner peripheral surface of the tank
supply-discharge opening 15.
[0051] As shown in FIG. 9A, in welding the one end portion of the
tubular film 23, all four layers of films in the end portion 23a of
the tubular film 23 are thermally welded simultaneously by the
thermally welding apparatus 33 to seal the end portion 23a. The
thermally welding apparatus 33 is constituted of a receiving stage
33a and a welding head 33b. The heat is applied to the end portion
23a, which is held by the welding head 33b and the receiving stage
33a after the welding head 33b has been moved down.
[0052] As shown FIGS. 10A-C, two stripes of thermal welding lines
35a and 35b of 5 mm in width are formed linearly at an interval of
5-10 mm. Note that one or three or more thermal welding lines may
be formed. In addition, a corrugated thermal welding line may be
applied to the present embodiment instead of the linear one. If the
plural thermal welding lines are formed, all lines may be formed
together, or each line may be formed one by one. In FIG. 10B, a
thermal welding line 36a is formed by welding the one end portion
of the inner tubular film 23 into two layer, and then a thermal
welding line 36b is formed by welding the one end portion of both
the inner and outer tubular films 23 into four layer. The thermal
welding line 36b is positioned outside the thermal welding line
36a. In FIG. 10C, thermal welding lines 37a and 37b are formed by
welding each end portion of the tubular film 23 into two layer
separately wherein the inner tubular film is slightly shorter in
length than the outer one. Although the thermal welding line may be
welded at a time, if the length of the welding head 33b is limited,
the thermal welding line may be welded sequentially every length of
the welding head 33b. Note that ultrasonic welding or other welding
method may be applied to the present embodiment instead of the
thermal welding by using the heat-sealing type thermal welding
apparatus 33.
[0053] As shown in FIG. 9B, a pressing roller 38 is rotated on the
work table 25 from the welded end portion 23a toward the other end
portion 23b to vent air 39 in the doubled tubular film 23. Instead
of rotating the pressing roller 38, the air may be vented by
folding the inner bag body 21 from one end side to the other end
side. Since the inner bag supply-discharge opening 22 is attached
close to the other end portion 23b so as to protrude from the inner
bag body 21, the air between the inner bag supply-discharge opening
22 and the other end portion 23b is vented by using a small roller
for avoiding the supply-discharge opening 22.
[0054] As shown in FIG. 9C, the other end portion 23b of tubular
film 23, in which the air has been vented, is welded by the thermal
welding apparatus 33 as well as the case of the end portion 23a.
Thereby, the transport inner bag 20 shown in FIG. 1A is completed.
A positioning mark 45 is recorded thereon along a central line
extending in the longitudinal direction of the transport inner bag
20 by using an oil-based ink or the like. The inner bag body 21 is
folded, and then contained in a packaging bag 40 as shown in FIG.
11E. Although the positioning mark 45 is formed linearly in the
present embodiment, the shape or size of the positioning mark is
not limited especially.
[0055] As shown in FIG. 11A, the inner bag body 21 with the
supply-discharge opening 22 directed downward is folded inward
along inward folding lines 21e in parallel with the positioning
mark 45 so as to make both the side edge portions 21a and 21b
approach the central line. Likewise, as shown in FIG. 11B, the
inward-folded portions are folded inward again along inward folding
lines 21f in parallel with the central line extending in the
longitudinal direction so as to make the inward folding line 21e
approach the central line. Thereby, the inner bag body 21 is double
folded. Subsequently, as shown in FIG. 11C, the inner bag body 21
is folded plural times along the inward folding lines 21g toward
the inner bag supply-discharge opening 22 from both the end
portions 21c and 21d of the inner bag body 21, so that the inner
bag body 21 is folded into a small size as shown in FIG. 11D. The
inner bag body 21 may be rewound from the one end to be a roll
shape instead of being folded inward along the inward folding lines
21g. After folding the inner bag body 21 into the small size, the
transport inner bag 20 is put in the packaging bag 40 as shown in
FIG. 11E. Since the inner bag body 21 is double folded along the
inward folding lines 21e and 21f, it can be contained compactly.
Note that the inner bag body 21 may be folded once or three times
and above along the central line extending in the longitudinal
direction.
[0056] As aforementioned, since the inner bag body 21 is folded
such that the inner bag supply-discharge opening 22 is directed
outside the inner bag body 21, the inner bag supply-discharge
opening 22 can be inserted to the tank supply-discharge opening 15
easily. In addition, the inner bag body 21 is folded inward along
the inward folding lines 21g, so that the inner bag body 21 can be
expanded easily in the longitudinal direction of the tank body 11
in a state that the inner bag supply-discharge opening 22 is set in
the tank supply-discharge opening 15. Furthermore, since the inner
bag body 21 is folded inward along each of the inward folding lines
21e and 21f in a state that the inner bag supply-discharge opening
22 is directed downward, the inner bag body 21 is expanded by
itself by filling the liquid from the inner bag supply-discharge
opening 22.
[0057] Although the pressure inner bag 19 is produced by a
procedure similar to the transport tank 20, the doubling of the
tubular film 23 and the recording of the positioning mark 45 are
not required and would be omitted. The filler supply-discharge
opening 18 is attached instead of the inner bag supply-discharge
opening 22. The filler supply-discharge opening 18 is attached so
as to correspond to the position of the hatch 13 of the tank body
11, so that it becomes possible to attach and remove the filling
hose 17 and also open and close the valve 50 at the hatch 13.
[0058] Next, the method of loading the transport inner bag 20 and
the pressure inner bag 19 in the tank body 11 is explained. First,
the inner bags 19, 20 in the packaging bag 40 are brought into the
tank body 11 by the operating person, and then the transport inner
bag 20 is taken out from the packaging bag 40. The positioning mark
45 is recorded linearly on the transport inner bag 20 so as to
correspond to the central line CL1 extending in the longitudinal
direction of the tank body 11. After the foot valve 16 has been
removed from the flange 15a of the tank supply-discharge opening
15, the inner bag supply-discharge opening 22 is inserted in the
tank supply-discharge opening 15 so as to conform the positioning
mark 45 to the central line CL1. Thereby, the attachment flange 22c
is attached firmly to the flange 15a. Second, the inner bag body 21
folded along the inward folding lines 21g is unfolded in the
longitudinal direction of the tank body 11, and then the folded
portions along the inward folding line 21f are unfolded. Both the
side edge portions which are folded along the inward folding lines
21e are not unfolded. Since the approximately overall width of the
inside of the tank body 11 is covered by the inner bag body 21 of
which the both side edge portions are folded along the inward
folding lines 21e, even if the both side edge portions are
unfolded, they are folded again by their weight.
[0059] Next, the pressure inner bag 19 is lapped over the unfolded
transport inner bag 20 to be unfolded in the same manner as the
transport inner bag 20. Subsequently, as shown in FIG. 5, the
filling hose 17 is connected with the filler supply-discharge
opening 18 of the pressure inner bag 19. As shown in FIG. 1, the
filling hose 17 is inserted inside the tank body 11 through the
hatch 13. After that, the operating person goes outside the tank
body 11 from the hatch 13 to finish the loading operation for the
inner bags 19, 20. Then, as shown in FIG. 8, the inner bag suction
preventing member 30 and the foot valve 16 are attached to the tank
supply-discharge opening 15 from the outside of the tank body
11.
[0060] The liquid as the cargo is filled from the tank
supply-discharge opening 15. The filling speed is 50 liters per
minute, for example. The inner bag body 21 is extended in the
longitudinal direction in the tank body 11, so that the inner bag
body 21 upswells by filling the liquid in the inner bag body 21
smoothly. The both side edge portions of the inner bag body 21,
which are folded inward, are gradually unfolded with the filling of
the liquid, so that the end portions of the inner bag body 21 are
not accidentally caught between the inner bag body 21 and the tank
body 11 by the weight of the portion in which the liquid is filled.
Therefore, the inner bag body 21 upswells smoothly by the filling
of the liquid. In the fully loaded condition, about 20 tons of
liquid is contained in the inner bag body 21; however, the present
embodiment premises the transportation in the non-fully loaded
condition, 10 tons of liquid is contained in the inner bag body 21
for an example of the non-fully loaded conditions.
[0061] The air is put up to 10-20% of the filling capacity, for
example, in the pressure inner bag 19 before or at the same time as
the onset of the liquid filling in the transport inner bag 20. The
pre-filling of the pressure inner bag 19 is performed in order to
arrange the shape of the pressure inner bag 19 so that the pressure
inner bag 19 avoids to be sandwiched between the transport inner
bag 20 and the inner surface of the tank body 11 due to the filling
of the liquid. The filling of the air is temporarily stopped at the
time of reaching the pre-filling amount. After the predetermined
transportation amount, 10 tons of liquid for example, has been
flowed in the transport inner bag 20, the air is filled again in
the pressure inner bag 19. The air is stopped filling after a gap
between the inner surface of the tank body 11 and the transport
tank 20 has been filled by the air. The filling hose 17 is removed
after closing the valve 50, and the cap 52 is placed on the filler
supply-discharge opening 18. After that, the hatch 13 is closed,
and then the filling operation for the tank body 11 is finished.
Note that the air to be preliminarily filled in the pressure inner
bag 19 maybe equal to or slightly exceed the capacity which
subtracts the predetermined transportation amount from the capacity
of the tank body 11 before the liquid filling in the transport
inner bag 20. If the air is preliminarily filled in the pressure
inner bag 19 to slightly exceed the above-mentioned capacity, the
liquid is filled in a state that the valve 50 is slightly open to
discharge the extra air in the pressure inner bag 19 while the
liquid is filled in the transport inner bag 20. Thereby, it is
possible to alleviate or eliminate the air filling operation in the
place for the liquid filling. Note that an air vent valve such as a
one-way valve may be provided instead of or in addition to the
valve 50.
[0062] In the present embodiment, the inner bag body 21 is loaded
in the tank body 11 to extend in the longitudinal direction, and
its side edge portions are folded inward toward the central line
extending in the width direction of the inner bag body 21. That
prevents the air from entering the inner bag body 21 and the inner
bag body 21 can be used for the anaerobic liquid. In addition,
since the inner bag body 21 and the inner bag supply-discharge
opening 22 are made from LLDPE having high chemical resistance, the
tank body 11 has more choices in material. Furthermore, it is
unnecessary to line the inner peripheral surface of the tank body
11 with fluorocarbon resin such as polytetrafluoroethylene.
[0063] When the inner bag body 21 dwindles to close with the inner
bag supply-discharge opening 22 after the remaining amount of the
liquid is reduced, the inner bag body 21 may be accidentally sucked
into the inner bag supply-discharge opening 22 to cover the opening
22. In order to prevent the inner bag body 21 from covering the
inner bag supply-discharge opening 22 in discharging the liquid
from the tank supply-discharge opening 15, when the liquid is
discharged from the tank supply-discharge opening 15, a passage
between the inner bag body 21 and the inner bag supply-discharge
opening 22 is ensured by the inner bag suction preventing member
30. The inner bag suction preventing member 30 is integrally
constituted of a semi-spherical end 30b arranged to protrude toward
the inside of the tank body 11, a tubular portion 30d whose
peripheral surface has plural continuous holes 30c, and the
attachment flange 30a provided on the base of the tubular portion
30d. The semi-spherical end 30b protrudes toward the inside of the
inner bag body 21, so that the residual liquid in the inner bag
body 21 can be surely discharged through the continuous holes 30c
without the inner bag body 21 stick to the inner bag
supply-discharge opening 22.
[0064] In the above embodiment, the inner bags 19, 20 are made from
LLDPE, they may be made from LDPE (low-density polyethylene), OP
(biaxially oriented polypropylene) and other synthetic resin. In
addition, although the inner bag body 21 is doubled in the present
embodiment, it may have a multilayer or single-layer structure.
Moreover, the tank body 11 may have different shapes than tube such
as an elliptical shape or others. Furthermore, the inner bags 19,
20 may be used not only for the tank container, but also for a
tanker lorry and so forth. The present invention is not limited
only to the inner bag having an envelope shape in the above
embodiment, but is also applicable to a cylindrical shape or other
shapes.
[0065] In the above embodiment, although the pressure inner bag 19
has the same size as the transport inner bag 20 capable of carrying
1-19 tons of cargo in the non-fully loaded condition, the pressure
inner bags may be provided with, for example, four sizes
accommodating to 1-5 tons, 5-10 tons, 10-15 tons and 15-19 tons of
cargo in accordance with the transportation amount. Thereby, the
pressure inner bag 19 the size of which is unnecessarily large is
not required, so that it is possible to prevent the material
thereof from being wasted. In addition, not only one pressure inner
bag but plural ones may be used in the present invention. In this
case, plural filling hoses are connected to each inner pressure bag
19 when the liquid as the cargo is filled.
[0066] The pressure inner bag 19 and the transport inner bag 20 may
be folded together in a state that the pressure inner bag 19 is
lapped over the transport inner bag 20 not as loading these inner
bags separately. Thereby, the folding and the loading of the inner
bag can be performed at a time, so that the operation time is
reduced in comparison with the case in which these operations are
performed separately. When folding together, the portions of these
inner bags may be temporally attached each other by a two-sided
adhesive tape.
[0067] The air is used as the filler in the above embodiment;
however, gas emission from a track engine or inert gas such as
nitrogen gas may be used. In addition, the air may be filled by
connecting a cartridge directly instead of using the filling hose.
Moreover, not only gasses but also liquids such as water or powder
and granular materials made of a synthetic resin foam may be used
as the filler. Furthermore, the cargo is not limited to only the
liquids, but powdery or granular cargo may be applied to the
present embodiment.
[0068] Note that the back pressure may be applied to the cargo by
expanding the pressure inner bag, which has the approximately same
capacity as the tank body, when the cargo is discharged from the
tank body. Thereby, the cargo having high viscosity can be
discharged smoothly and rapidly.
[0069] Although the present invention has been fully described by
the way of the preferred embodiments thereof with reference to the
accompanying drawings, various changes and modifications will be
apparent to those having skill in this field. Therefore, unless
otherwise these changes and modifications depart from the scope of
the present invention, they should be construed as included
therein.
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