U.S. patent application number 10/220057 was filed with the patent office on 2003-02-06 for inner bag for bag-in-box.
Invention is credited to Ichikawa, Makoto, Yoneyama, Michinori.
Application Number | 20030024950 10/220057 |
Document ID | / |
Family ID | 26586559 |
Filed Date | 2003-02-06 |
United States Patent
Application |
20030024950 |
Kind Code |
A1 |
Yoneyama, Michinori ; et
al. |
February 6, 2003 |
Inner bag for bag-in-box
Abstract
An inner bag for bag-in-box capable of increasing an easiness in
handling and convenience when a filled inner bag (1) for bag-in-box
is handled without an outer box, where reinforced heat sealed parts
(5, 5') formed by cutting out side films (4, 4') and sealing a
front film (6) with a rear film are provided continuously or
closely to heat sealed parts (2, 3) on an upper side on/or a lower
side of the inner bag, or a holding part is provided formed by
sealing the front film (6) with the rear film through or without
through the side films (4, 4') so that a not sealed part (17)
between the side films (4, 4') is formed at or near at least one
corner part between the films and the heat sealed parts (2, 3) and
so that, when a hand is accessed to the outside of the inner bag
(1) through the not sealed part (17).
Inventors: |
Yoneyama, Michinori;
(Chuo-ku, JP) ; Ichikawa, Makoto; (Chuo-ku,
JP) |
Correspondence
Address: |
Sherman & Shalloway
413 N Washington Street
Alexandria
VA
22314
US
|
Family ID: |
26586559 |
Appl. No.: |
10/220057 |
Filed: |
August 28, 2002 |
PCT Filed: |
March 1, 2001 |
PCT NO: |
PCT/JP01/01579 |
Current U.S.
Class: |
222/105 |
Current CPC
Class: |
B65D 33/06 20130101;
B65D 77/062 20130101; B65D 31/10 20130101; B65D 31/02 20130101;
B65D 33/02 20130101; B65D 77/065 20130101 |
Class at
Publication: |
222/105 |
International
Class: |
B65D 035/56 |
Claims
1. A gazette shape inner bag for bag-in-box whose side film to be
folded is composed of a laminated film prepared by laminating multi
layers so as a resin layer which is hard to be adhered by heat
sealing is arranged at the surface, comprising reinforcing heat
sealed parts formed by cutting out side films and sealing a front
film with a rear film are provided continuously or closely to heat
sealed parts on an upper side and/or a lower side of the inner
bag.
2. The inner bag for bag-in-box of claim 1, wherein the front film
is adhered by heat sealing with the rear film by cutting out the
side film at a corner part or near the corner part.
3. The inner bag for bag-in-box in accordance with claim 1 or claim
2, wherein said inner bag possesses a fin part of triangle shape
which is divided from a containing part by a heat sealed part.
4. The inner bag for bag-in-box of claim 3, wherein at least one
fin part is cut off.
5. The inner bag for bag-in-box of claim 4, wherein all fin parts
locating at the lower side are cut off.
6. A gazette shape inner bag for bag-in-box prepared by adhering by
heat sealing of one or more sheets of film, wherein said inner bag
possessing a holding part formed by sealing the front film with the
rear film through or without through the side film so that a not
sealed part between the films is formed at or near at least one
corner part between the films and the heat sealed parts and so
that, when a hand is accessed from the side part of the inner bag,
fingers are passed to the outside of the inner bag through the not
sealed part.
7. The inner bag for bag-in-box of claim 6, wherein the holding
part is prepared on both side of the heat sealed part locates at
upper and/or lower side.
8. The inner bag for bag-in-box in accordance with claim 6 or claim
7, wherein said inner bag possesses a cut out part prepared by
cutting off one part or all part of film of the not sealed part
locating at upper and/or lower side.
9. The inner bag for bag-in-box in accordance with any one of
claims 6 to 8, wherein said inner bag possesses a fin part divided
by triangle shape, further the holding part is formed on said fin
part.
10. The inner bag for bag-in-box of claim 9, wherein all fin parts
locating at the lower side are cut off.
11. The inner bag for bag-in-box in accordance with any one of
claims 6 to 10, wherein the side film is the laminate which
laminate so as resin layer which are hard to be adhered by heat
sealing to be arranged at the surface, and the holding part is
prepared by sealing without sealing the side film by preparing a
punch hole on the side film.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to an improvement for handling
of inner bag for bag-in-box comprising an inner bag which is a
molded product made of synthetic resin film and an outer box made
of cardboard. More in detail, the present invention relates to an
improved inner bag for bag-in-box possessing a gazette part.
BACKGROUND OF THE INVENTION
[0002] In general, a container composed of an inner bag fabricated
by heat sealing of synthetic resin film and an outer box made of
cardboard which is prepared for the purpose of filling up,
preserving and transferring of fluid such as liquid or powder is
commonly called as a bag-in-box, and ones whose capacity are from 5
to 20 liter are broadly used as a container for foods or medicines.
These containers are mainly applied for the business use, and
actually used as a container for materials of foods or medicines or
as a large size container for subdivisional use.
[0003] In the meanwhile, recently, for the purpose of severe
sanitary controlling of producing environment of foods or
medicines, the requirements to protect the contamination of the
producing environment by dusts generated from the outer box by
picking out an inner bag from the outer box and carrying it alone
in into the producing environment is becoming more serious.
[0004] Therefore, for these inner bag for bag-in-box, the easiness
in handling when handled without outer box is becoming strongly
required.
[0005] In the meanwhile, these inner bags for bag-in-box are
becoming to be required to have a good handling efficiency when
handled without an outer box.
[0006] The inner bag for bag-in-box can be classified into
following two types. That is, one is a molded type inner bag having
excellent self-standing ability prepared by a blow molding method
or by a vacuum molding method and another one is a film type inner
bag which is prepared by thermally sealing of film which is
characterized by using smaller amount of synthetic resin. Further,
said film type can be classified into a plane bag type and a
gazette bag type.
[0007] Although the self-standing ability of the above mentioned
gazette type inner box as a container is not superior to that of a
molded type, it is superior to that of a plane bag type, therefore,
it is desirably used as the inner bag to be handled without an
outer box.
[0008] But, the gazette type bag-in-box has several problems, and
the intensity of it is pointed out as one of the problems.
[0009] For example, in Japanese utility model laid open publication
JP64-9174 (refer to drawing No.7), a gazette type bag-in-box whose
gazette part is formed by folding both sides of periphery edge of
the bag main-body to inner side is disclosed.
[0010] As disclosed in said Japanese utility model laid open
publication JP64-9174, a bag of gazette shape has following defect.
That is, when the bag is filled up by liquid, since the stress is
concentrated to the crossing point of crease of folding part of
film located to the side surface and a heat sealed part of upper or
lower side, the bag is weak against the stress such as inner
pressure.
[0011] In above mentioned Japanese utility model laid open
publication JP64-9174, for the purpose to improve above mentioned
defect, there is the description that the intensity of the crossing
point is improved by preparing an oblique belt shape heat sealed
part which traverses from the crossing point of crease of folding
part and a heat sealed part of upper or lower side to the voluntary
point of the both sides of periphery edge of the bag. The
preparation of said oblique belt shape heat sealed part is also
useful from the view point to reduce the remaining amount of liquid
at the discharging of the liquid, because it is effective to
prevent the liquid from remaining between a film and a film at the
end of inner bag.
[0012] However, the effect of preparation of the oblique belt shape
heat sealed part is not sufficient. Sometimes, by the strong impact
such as falling down, the bag is broken because of lack of
intensity. According to the description of above mentioned Japanese
utility model laid open publication JP64-9174, the effect of the
improvement is only illustrated as follows. Namely, since the
tensile tension is dispersed homogeneously, it is possible to use a
press discharging method characterizing by discharge the contents
by pressing the outer surface of the bag. Further, the triangle
part locating at the outside of oblique belt shape heat sealed part
is easily opened at the handling of a filled up bag and deteriorate
the intensity of above mentioned crossing point.
[0013] Furthermore, this triangle part disturbs the easiness in
handling of the filled up bag, when it is contained into an outer
box.
[0014] Still further, since this triangle part becomes hard and
disturbs the self-standing ability of the bag, said triangle part
becomes the cause to disturb the self-standing of the filled up
inner bag when it is handled without outer bag.
[0015] By the way, in above mentioned Japanese utility model laid
open publication JP64-9174, there is a description to cut off the
triangle parts of the lower part of the inner bag for the purpose
to improve the self-standing ability of it. However, when the
triangle part is cut off, the new problems, that the crossing point
becomes more easily opened and the intensity to the inner pressure
is affected, are arisen. Such kind of problems can be observed when
a laminated film prepared by laminating multi layers so as a
biaxial orientated film or a nylon resin layer which are hard to be
adhered by heat sealing to be arranged at the surface. And, for the
improvement of the intensity of gazette type bag-in-box inner bag,
above mentioned problem is an obstacle to disturb said
improvement.
[0016] Further, another problem is pointed out. Namely, since an
adequate hand hold part is not attached to the inner bag, the
handling of it is not so easy, especially when a filled up inner
bag is picked up and removed from an outer box or is carried
without outer box. For the purpose of easiness in handling of an
inner bag, as shown in FIG. 21, the inner bag for bag-in-box to
which a hand hold is attached is disclosed in Japanese Patent Laid
Open Publication 2-8763. In this case, a heat sealed part is formed
on the upper part of gazette type inner bag, and further a heat
sealed part is formed so as a front film and a rear film become one
body at the corner part of the inner bag. And said heat sealed part
can be held by a hand. However, according to said reference
invention, since whole upper side of the bag is sealed by heat in a
straight line at the forming process of a heat sealed part of the
corner part, there is no space to thrust a finger into. Therefore,
the problem that the heavy load is burdened with a finger is
pointed out.
[0017] Additionally, at the filling up process, in a case when an
inner bag is set to an outer box after contents are filled up into
the inner bag, there is also a problem same as mentioned above.
DISCLOSURE OF THE INVENTION
[0018] The structural feature of a gazette shape inner bag for
bag-in-box is characterized as that the side film which is folded
from both side edge part to inner side is inserted between a front
film and a rear film at the gazette part. A heat sealed part of an
upper or lower side is consisted of two heat sealed parts. That is,
one is the heat sealed part locating at the center position where
the front film and the rear film are faced and said front film is
adhered with said rear film directly by heat sealing (this part is
called as a heat sealed part), and another one is the heat sealed
part locating to the outer side where the front film or the rear
film is adhered with the side film by heat sealing. At the
preparation of the heat sealed part of upper side or lower side,
said two heat sealed part are prepared continuously to form a
straight line. Generally, the surface and the reverse surface of
the film which consist of a gazette shape inner bag for bag-in-box
are usually made of thermo fusable film, and the films of the side
surface are sealed by heat and adhered each other at the folded
part of upper or lower side. In a case when a laminated film
prepared by laminating multi layers so as a biaxial orientated film
or a nylon resin layer which are hard to be adhered by heat sealing
to be arranged at the surface is used, for the purpose to improve
the intensity of inner bag, films of the side surface are not
sealed by heat and not adhered each other.
[0019] The present invention is carried out to dissolve above
mentioned problem that a conventional bag-in-box has. The first
object of the present invention is to improve the intensity of the
inner bag without spoiling the self-standing ability of it when a
filled up inner bag for bag-in-box is handled without an outer box.
The second object of the present invention is to provide an inner
bag for bag-in-box whose easiness in handling and convenience are
improved.
[0020] The first invention is the invention which is preferable to
be applied to a gazette shape inner bag for bag-in-box whose side
film to be folded is composed of a laminated film prepared by
laminating multi layers so as a resin layer which is hard to be
adhered by heat sealing is arranged at the surface. The important
point of the first invention is an inner bag for bag-in-box
comprising reinforcing heat sealed parts formed by cutting out side
films and sealing a front film with a rear film are provided
continuously or closely to heat sealed parts on an upper side
and/or a lower side of the inner bag. In a case of above mentioned
inner bag for bag-in-box, it is desirable that the front film is
adhered by heat sealing with the rear film by cutting out the side
films at a corner part or near the corner part. In a case of above
mentioned inner bag for bag-in-box, it is further desirable to
divide the containing part for contents by heat sealed part so that
forms fin parts of triangle shape. At least one of said fin parts
of triangle shape can be cut off, and it is desirable to cut off
all fin parts of triangle shape locating at the lower part.
[0021] The inner bag for bag-in-box to which a reinforcing heat
sealed parts formed by sealing a front film with a rear film are
provided has following strong points based on above mentioned
structural feature, that is;
[0022] (1) At the heat sealed part on an upper side or a lower side
of the gazette shape inner bag for bag-in-box, a front film is
adhered by heat seal with a rear film by cutting out side films,
and when abnormal stress caused by careless falling down of the
inner bag is loaded to the bag, the breaking of the side films near
the heat sealed part on an upper side or a lower side is prevented
by this structural feature, and further the load burdened to the
top heat sealed part can be reduced.
[0023] (2) Further, at the corner part or near the corner part,
side films are cut off and a front film is adhered by heat sealing
with a rear film, and by this structural feature, the reinforcing
effect described in (1) becomes more remarkable and the damage of a
side film caused by the contact with the inner surface of an outer
box can be prevented. And, since the heat sealed parts at the
corner part can be used as the holding part, it is convenience for
loading and unloading of the filled up inner bag from the outer
box, transferring of the filled up inner bag or for discharging of
the contents contained in the inner bag.
[0024] (3) The amount of the remaining liquid after whole contents
in the inner bag is discharged can be reduces by making the inner
bag gazette shape having fin parts divided from the containing part
by the heat sealed part. And at the forming process of a
reinforcing heat sealed part, even if the cutting off width of a
side film is wider than the width of an upper or lower heat sealed
part, the cut out part is existing in the fin part, and the leaking
of the contained liquid does not occur.
[0025] (4) And, in a case when the film composing an inner bag is a
hard material, since the presence of the fin part prevents easiness
in handling at insertion of the filled up inner box into an outer
box, at putting on the lid and further deteriorates the self
standing ability of the bag, it is desirable to cut off the fin
part previously to avoid such kinds of inconvenience.
[0026] The second invention is the invention which is desirable to
be applied to a gazette shape inner bag for bag-in-box prepared by
adhesion by heat sealing of one or more sheets of film and the
important point of the invention is illustrated as follows. That
is, the important point of the second invention is an inner bag for
bag-in-box providing a holding part formed by sealing the front
film with the rear film through or without through the side film so
that a not sealed part between the films is formed at or near at
least one corner part between the films and the heat sealed parts
and so that, when a hand is accessed from the side part of the
inner bag, fingers are passed to the outside of the inner bag
through the not sealed part. For the purpose of further improvement
of the easiness in handling and convenience of the inner bag for
bag-in-box, it is desirable that the holding part is prepared on
both side of the heat sealed part locates at upper and/or lower
side. Furthermore, it is more desirable to provide a cut out part
prepared by cutting off one part or all part of film of above
mentioned not sealed part locating at upper and/or lower side,
because the load to be burdened with a finger can be reduced when
the bag is held by a hand. Still further, it is desirable to
prepare a band shape sealed part at the voluntary position from the
edge of the heat sealed part locating at upper and/or lower side to
the outer periphery part, prepare a fin part divided by triangle
shape and provide a holding part to the triangle fin part. Said
triangle fin part which locates at the lower side can be cut off,
and by cutting off it, the self standing ability of the inner bag
when it is handled without an outer box can be improved.
[0027] In the case of the gazette shape inner bag of the present
invention, the front film is adhered by heat sealing with the rear
film so that a not sealed part is formed at or near at least one
corner between the heat sealed part. The inner bag is designed so
as the finger can pass through from the not sealed part of the
front film and the rear film when a hand is accessed from the side
part of the inner bag to the gap between the front film and the
side film or the rear film and the side film. Therefore, the bag
can be held by hand without burdening the load to fingers. And it
is desirable to provide a holding part composed of the heat sealed
part of the front film with the rear film to the both side of the
heat sealed part so as the inner bag can be held by both hands.
[0028] When a single film or a multi layered film which has a heat
adherent resin layer such as polyethylene or polypropylene on the
both surfaces is used alone as the side film, the front film and
the rear film can be adhered by heat sealing through side film at
the corner part. Therefore, for the purpose to form a not sealed
part of side films, it is only needed to seal with a seal bar used
for the sealing of upper or lower side possessing a cut out to form
a not sealed part. When a laminate which is prepared so as a resin
layer that is hard to be adhered by heat seal such as a polyamide
resin layer or a biaxial orientated film to be arranged on the
surface is used as the side film, for the purpose to adhere a front
film with a rear film by heat seal, a part of the side film is cut
off by circular or oval shape (punch hole) and the reverse side of
the front film is adhered by heat seal with the reverse side of the
rear film without through the side film. It is desirable to prepare
plural punch holes to improve the intensity, and preferably, the
distance among punch holes can be make wider and make it a not
sealed part so as to allow the insertion of fingers.
[0029] As mentioned above, easiness in handling of the inner bag of
the present invention can be improved by forming a holding part
prepared by adhering the front film with the rear film by heat seal
so as to form a not sealed part between at least one corner part
and heat sealed part, and said not sealed part is located at the
corner part or near the corner part. However, when the amount of
the contents is over than 10 litter, films of higher intensity is
used and the toughness of the inner bag becomes stronger.
Therefore, when a filled up inner bag is picked up by holding a
holding part, the film at the not sealed part is bent toward inner
side and sometimes a finger is caught between films. To reduce the
load to the finger, in the present invention, for example, a not
sealed part is prepared on upper or lower side and prepare a cut
out part in a part of said not sealed part. Throughout the cut out
part, fingers can pass through and can hold the holding part
provided to upper or lower side. And by above mentioned structural
feature, the handling of the inner bag becomes very easy, that is,
easiness in handling, for example, picking out the inner bag from
the outer box, carrying the inner bag or discharging the contents
from the inner bag is improved. Further, also the work to insert
the inner bag filled up with the content to the outer box becomes
very easy. By preparing a cut out part, a hole is prepared on upper
or lower side, and hereinafter this cut out part can be described
as a handle hole. Surrounding the handle hole, the not sealed part
can be remained or can not be remained. In a case that the not
sealed part is not remained, a hole is formed after all side is
sealed by heat and the hole can be used as a handle hole.
[0030] In the present invention, for the purpose to prevent the
leak of the contents in the inner bag which is caused by preparing
the cut out part, it is desirable to prepare a band shape heat
sealed part at the voluntary position from the edge of a heat
sealed part locating at upper and/or lower side to an outer
periphery part, and prepare a fin part divided by triangle shape.
And by providing a holding part to the triangle fin part, the
contents do not remain in the corner part at the discharging
operation, further it acts as a protector of the side film at the
transferring operation of the filled up bag-in-box. Further, by
cutting off the triangle shape fin part located at the lower side,
the self standing stability of the inner bag, which is important
when the inner bag is took out, is improved so that the inner bag
is easily contained in the outer box.
[0031] The gazette shape inner bag for bag-in-box of the present
invention is the gazette shape bag prepared by inserting a side
film which is folded to inner side between the front film and rear
film and whose surrounding part is sealed by heat and having tucks
at the side part, however, it is possible to use a cylinder shape
film instead of the front film, rear film and the side surface
film, both sides of the cylindrical film are fold to inner side,
and to adhere the upper corner part with the lower corner part by
heat sealing without forming a heat sealed part on a side part.
BRIEF ILLUSTRATION OF THE DRAWINGS
[0032] FIG. 1 is the plane view of the folded state of one example
of the inner bag for bag-in-box of the first invention.
[0033] FIG. 2 is the plane view of the folded state of the other
example of the inner bag for bag-in-box of the first invention.
[0034] FIG. 3 is the plane view from the bottom of the inner bag
for bag-in-box of FIG. 2 in which liquid filled up.
[0035] FIG. 4 is the plane view of the other example of the inner
bag for bag-in-box of the first invention.
[0036] FIG. 5 is the plane view from the bottom of the inner bag
for bag-in-box of FIG. 4 in which liquid is filled up.
[0037] FIG. 6 is the plane view of the other example of the inner
bag for bag-in-box of the first invention.
[0038] FIG. 7 is the example of the conventional gazette shape
inner bag for bag-in-box on which oblique heat sealed parts are
formed.
[0039] FIG. 8 is the example of the conventional gazette shape
inner bag for bag-in-box from which the outside parts from oblique
heat sealed parts are cut off.
[0040] FIG. 9 is the plane view from the bottom of the inner bag
for bag-in-box of FIG. 7 in which liquid contents is filled up.
[0041] FIG. 10 is the plane view from the bottom of the inner bag
for bag-in-box of FIG. 8 in which liquid is filled up.
[0042] FIG. 11 is the plane view of the folded state of one example
of the inner bag for bag-in-box of the second invention.
[0043] FIG. 12 is the plane view of the folded state of the other
example of the inner bag for bag-in-box of the second
invention.
[0044] FIG. 13 is the plane view of the folded state of the other
example of the inner bag for bag-in-box of the second invention to
which cut out parts are formed.
[0045] FIG. 14 is other example of the inner bag for bag-in-box of
the second invention showing the plane view of the folded state of
the inner bag for bag-in-box of FIG. 13 from which triangle fin
parts locating at lower position are cut off.
[0046] FIG. 15 is the perspective view of the inner bag for
bag-in-box of FIG. 14 in which liquid is filled up.
[0047] FIG. 16 is the other example of the inner bag for bag-in-box
of the second invention showing the plane view of the folded state
of the inner bag to the corner part of which a punch hole is
formed.
[0048] FIG. 17 is the other example of the inner bag for bag-in-box
of the second invention showing the plane view of the folded state
of the inner bag which abbreviate to form a heat sealed part at the
both sides.
[0049] FIG. 18 is the other example of the inner bag for bag-in-box
of the second invention which abbreviates to form a heat sealed
part at the sides, showing the plane view of the folded state of
the inner bag.
[0050] FIG. 19 is the partial plane view of the other example of
the inner bag for bag-in-box of the second invention showing the
folded state of the inner bag to the corner part and near the heat
sealed part of which punch holes are formed.
[0051] FIG. 20 is the partial plane view of another example of the
inner bag for bag-in-box of the second invention showing the folded
state of the inner bag to the corner part and near the heat sealed
part of which punch holes and also cut out parts are formed.
[0052] FIG. 21 is the conventional inner bag for bag-in-box with
handle parts.
THE BEST EMBODIMENT TO CARRY OUT THE INVENTION
[0053] The present invention is illustrated more in details.
[0054] As the materials of the bag used in the first invention, a
laminate such as a laminated film or a co-extruded film is used
according to the required ability. As a laminate to be used, a
laminate having following structural feature can be mentioned. That
is, a film having relatively high mechanical strength such as
biaxial orientated polyamide, biaxial orientated polyester or
biaxial orientated polypropylene or a resin layer not to be easy
sealed by heat e.g. polyamide resin layer is arranged to be the
outermost surface layer, and a polyolefin resin layer to be easily
sealed by heat such as polyethylene or polypropylene is arranged to
be the inmost layer, can be mentioned. When it is necessary to add
further ability to these laminate, an adequate functional film can
be voluntarily added to the laminate. For example, when a barrier
ability against oxygen gas is necessary, a silica evaporated film
or copolymer of ethylene-vinylalcohol (EVOH) can be added, and when
a light shielding ability is necessary, an aluminum foil or an
aluminum evaporated film can be added to the laminate. That is,
adequate multi layered film, which is a laminate, is voluntarily
selected according to the use. For example, a laminate film
composed of polyester, aluminum foil and polyethylene, a
co-extruded multi layered film of EVOH and polyethylene or a
co-extruded multi layered film of polyamide, EVOH and polyethylene
can be mentioned. Further, these films can be used alone or can be
used by overlapping with polyethylene single film without sealing,
however, not intending to be limited to them.
[0055] In the present invention, the heat sealed part of upper
and/or lower side indicates the part where a front film is directly
adhered by heat seal with a rear film at upper and/or lower side.
In the present invention, a cut out part is prepared to a side film
continuously or closely to said heat sealed part, and a reinforced
heat sealed part is formed by adhering a front film with a rear
film by heat sealing. As the shape of the cut out part, any shape
such as circular or oval shape can be used, and for the purpose to
improve the mechanical strength plural numbers of cut out parts can
be prepared. In this case, it is desirable to prepare a cut out
part on the corner part or closely to the corner part.
[0056] Still further, it is desirable to provide a heat sealed part
at the position from the edge part of heat sealed part locating at
upper and/or lower side toward the side periphery part, and to
divide the containing part for contents by said heat sealed part,
because the amount of remaining liquid can be reduced by dividing
the containing part. And, it is further desirable by the reason
mentioned above to cut off and remove the triangle shape fin parts
that is divided by said heat sealed parts.
[0057] The first invention will be illustrated more readily
according with the drawings.
[0058] FIG. 1 is the plane view of the folded state of one example
of the inner bag for bag-in-box of the first invention.
[0059] In FIG. 1, 1 is an inner bag, 2 is a heat sealed part of the
upper side, 3 is a heat sealed part of the lower side, 4, 4' are
side films which are folded, 5, 5' are reinforcing heat sealed
parts which exist closely to the heat sealed part of the upper
side, 6 is a front film of the inner bag and 7 is a heat sealed
part which divides a containing part and a fin part. By preparing
holes previously to each folded side films 4, 4', and by sealing
lower side, the reinforce heat sealed part is formed by adhering
the front film with the rear film by heat sealing at the hole
position. And, in the drawings, 8 and 10 are a crossing point of
the heat sealed part of the lower side and the side film, 9 and 11
are crossing point of the heat sealed part of the upper side and
the side film, 13 is a heat sealed part of the side periphery, 14
is a rear film and 15 is a spout.
[0060] FIG. 2 is the case of the inner bag for bag-in-box of FIG. 1
to which a corner heat sealed part 16 is formed by cutting out the
side film near the corner point. FIG. 3 is a plane view from the
bottom of the inner bag for bag-in-box of FIG. 2 in which liquid is
filled up. In addition to the reinforced heat sealed part 5, 5',
since the front film and the rear film of the bag are becoming one
body, even if the impact is added, the side film near the heat
sealed part does not spread and the mechanical strength is
improved.
[0061] FIG. 4 is the shape showing outer part of the heat sealed
part 7 which divide a containing part and fin part is cut off.
[0062] FIG. 5 is the perspective illustration from the bottom side
of the inner bag for bag-in-box of FIG. 4 in which liquid is filled
up. Same as to FIG. 1, a front film and a rear film of inner bag
are adhered by heat sealing and become one body at the reinforcing
heat sealed parts 5, 5', therefore, even if the impact is added,
the side film near the heat sealed part does not spread and the
mechanical strength is improved. Further, the inner bag can stand
up by itself stable, because the fin part is cut off.
[0063] FIG. 6 is another example of the present invention. This
drawing shows the example that the all fin parts are cut off.
[0064] FIG. 7 and FIG. 8 are the plane view of the conventional
inner bag for bag-in-box. FIG. 9 is the perspective illustration
from the bottom side of the inner bag for bag-in-box of FIG. 7 in
which liquid is filled up, and FIG. 10 is the perspective
illustration from the bottom side of the inner bag for bag-in-box
of FIG. 8 in which liquid is filled up. The inner bag for
bag-in-box shown in FIG. 9 and FIG. 10 have a weak point that the
side films near the heat sealed part is easily open and the
mechanical strength against the inner pressure is not so
strong.
[0065] Further, the second invention will be illustrated more
readily in accordance with the drawings.
[0066] FIG. 11 is the plane view of the folded state of the inner
bag for bag-in-box of the second invention. In FIG. 11, 17 is the
not sealed part, 2 is the heat sealed part of the upper side, 3 is
the heat sealed part of the lower side, 13 is the heat sealed part
of the side periphery, 12 and 12' are the folding line of the side
film, 15 is the spout, 4 is the side film and 6 is the front film.
In a case of this inner bag for bag-in-box, when a hand is inserted
from the side part, a finger can pass through from the not sealed
part 17 and can hold the corner heat sealed part. Regarding the
lower side, it is also possible to prepare a not sealed part and to
seal it.
[0067] FIG. 12 is the plane view of the folded state of the inner
bag for bag-in-box of another Example of the present invention. In
FIG. 12, 18 is a cut out part and 7 is a oblique heat sealed part.
When the inner bag is hold by the finger passed through the not
sealed part of the inner bag for bag-in-box of FIG. 11, since
sometimes the film of not sealed part cuts into the finger, FIG. 12
is the Example to avoid said problem and to reduce the load to the
finger by preparing a cut out part (handle hole) 18. And, for the
purpose to prevent the leak of the contents in the inner bag from
the cut out part (handle hole) 18, a heat sealed part 7 is prepared
obliquely from the edge part of the heat sealed part to the outer
periphery part. By preparing the cut out part (handle hole) 18, it
becomes possible to hold the heat sealed part of the upper side
easily and certainly without burden.
[0068] FIG. 13 is the plane view of the other Example of the
present invention, to the lower part of which a oblique heat sealed
part 7 is prepared. By preparing the oblique heat sealed part 7 at
the lower part, it becomes possible to reduce the amount of
remaining liquid in the inner bag at the discharging of the
contained liquid in the inner bag. Further, it is possible to
prevent the damage of the inner box caused by rubbing of the side
surface film at the transferring action of the filled up inner bags
for bag-in-box.
[0069] FIG. 14 is the plane view of the inner bag for bag-in-box
from which a triangle shape fin part formed by preparing a oblique
heat sealed part at the lower side. And by cutting off said
triangle shape fin part, the self-standing ability of the inner bag
filled up with liquid is improved.
[0070] FIG. 15 is the perspective view of the inner bag for
bag-in-box of FIG. 14 in which liquid is filled up. It is clearly
understand from FIG. 15 that the film locating at the both side of
the upper heat sealed part can expand to front and rear direction,
and the filled up inner bag can be easily lifted by inserting
fingers into handle holes. If the handling holes are not prepared,
it is not so easy to lift the large capacity inner bag of 20 liter
around, because the high load is burdened to the fingers.
[0071] If the laminate which laminate a biaxial orientated film or
a nylon resin layer which are hard to be adhered by heat sealing
are arranged at the surface is used as a side film, a front film
and a rear film can be sealed by heat and adhered each other
without sealing the side film by preparing a punch hole on the side
film. FIG. 16 is the plane view of the inner bag for bag-in-box
using a laminate arranging a resin layer which is hard to be sealed
by heat on the surface as a side film. In FIG. 16, a punch hole is
prepared at the corner of the side film, the front film and rear
film forms the reinforcing heat sealed part 16 by being sealed by
heat together with without sealing the side film throughout the
punch hole, and a cut out part 18 can be prepared between a heat
sealed part and a corner heat sealed part so as the cut out part
acts as a handle.
[0072] FIGS. 17 and 18 are the plane view showing the other
examples of the present invention. These examples are showing the
cases abbreviating the sealing of the side part. These bags show
the following case, that is, the both ends of the cylindrical film
such as an inflation tube or a cylindrical tube formed by back
sealing method is folded to inner side so as to form tucks and
upper and lower part are adhered by heat sealing. FIG. 17 shows an
example that a handle hole is prepared at the upper triangle shape
fin part of the inner bag that abbreviating the preparation of the
sealing at the side part, further another handle hole is also
prepared at the lower triangle shape fin part of the inner bag.
FIG. 18 shows an example that a reinforcing heat sealed part 16 is
prepared by a punch hole closely to the upper corner and a handling
hole is prepared at the upper triangle shape fin part, further, the
lower triangle shape fin part is cut off.
[0073] Furthermore, FIGS. 19 and 20 are the partial plane view
showing the other examples of the present invention. FIG. 19 shows
an example that a reinforcing heat sealed part 16 is prepared by a
punch hole at the corner part and closely to the end of the heat
sealed part by making a punch hole, and FIG. 20 shows an example
that a cut out part 18 is prepared between reinforcing heat sealed
part 16 prepared by two punch holes shown in FIG. 19. In FIG. 19,
since the part between two holes is not sealed, it is possible to
hold the bag for bag-in-box by piercing fingers throughout this not
sealed part. As shown in FIG. 20, the bag for bag-in-box can be
hold more easily by preparing a cut out part 18.
EXAMPLES AND COMPARATIVE EXAMPLES
[0074] The first invention will be illustrated in more detail
according to the Examples, however, not intended to be limited to
these Examples.
Example A and B and Comparative Example C and D
[0075] The self-standing test and the dropping test of the
container are carried out on Example A and B of the present
invention corresponding to FIG. 2 and FIG. 4 and Comparative
Example C and D corresponding to FIG. 7 and FIG. 8 which are the
conventional type container. The self-standing ability and the
intensity for dropping of these containers are compared. The
materials of these inner bag are the double bag using linear
polyethylene mono film of 60 .mu.m thickness as an inner layer and
using laminated film composed of 15 .mu.m thickness nylon film/60
.mu.m thickness linear polyethylene mono film as an outer layer.
The capacity of the inner bag is united to 20 liter.
[0076] The method for self-standing test of the container is
illustrated as follows. That is, an inner bag of 20 liter capacity
is filled up with 20 liter of water is settled without an outer
box, then the floor is inclined to the front and rear direction and
the right and left direction of the inner box. The incline angle of
the floor when the inner bag tumbles down is measured. The test is
repeated for five times. The results are summarized in Table.
1.
[0077] The method for the dropping test of the container is
illustrated as follows. That is, an inner bag of 20 liter capacity
is filled up with 20 liter of water is fallen down to the floor,
and the height that the inner bag is broken and the broken position
are measured. The test is repeated for five times. The results are
summarized in Table. 2.
1TABLE 1 Comparison test results of Self-standing ability Inclined
angle of floor for a bag tumbling down 20 liter of water is filled
into a bag of 20 liter capacity Measuring number: n = 5 inclined
angle for the bag tumbling down (degree) specimen front and rear
direction right and left direction Example A 10.about.15
10.about.20 Example B 20.about.25 20.about.25 Comp. Example C
10.about.15 10.about.20 Comp. Example D 20.about.25 20.about.25
[0078]
2TABLE 2 Comparison test results of the dropping test Height for
breaking 20 liter of water is filled into a bag of 20 liter
capacity Dropped down from the bottom surface measuring Temp.:
20.degree. C., Measuring number: n = 5 height for bag breaking
specimen (m) broken position of bag Example A 1.0.about.1.5 bottom
crossing point Example B 0.8.about.1.2 bottom crossing point Comp.
Example C 0.5.about.0.7 bottom crossing point Comp. Example D
0.3.about.0.5 bottom crossing point
[0079] According to these test results, following facts are become
clear. That is, from the results of Table 1, it is clearly
understood that the self-standing ability of Examples A and B are
not spoiled in comparison with that of Comparative Examples C and
D. Further, from the results of Table 2, the inner bag of
Comparative Examples C and D breaks at lower height than that of
Examples A and B, and the breaking position is the crossing
position of lower heat sealed part and side film. Therefore, it is
obvious that the intensity for dropping of Examples A and B are
superior to that of Comparative Examples C and D.
[0080] Possibility for the Industrial Use
[0081] As mentioned above, in the inner bag for bag-in-box of
gazette shape, the first invention is an inner bag for bag-in-box
comprising reinforcing heat sealed parts formed by cutting out side
films and sealing a front film with a rear film are provided
continuously or closely to heat sealed parts on an upper side
and/or a lower side of the inner bag. And according to the first
invention, when abnormal stress caused by careless falling down of
the inner bag is loaded to the bag, it is possible to prevent the
breaking of the side films near the heat sealed part on an upper
side or a lower side and can reduce the load to the top heat sealed
part without spoiling the self-standing ability of the container,
that is the substantial mechanical strength of the bag can be
improved.
[0082] According to the present invention, at the corner part or
near the corner part, side films are cut off and a front film is
adhered by heat sealing with a rear film, and by this structural
feature, the damage of a side film caused by the contact with the
inner surface of an outer box can be prevented. And, since the heat
sealed parts at the corner part can be used as the handling part,
it is convenience for loading and unloading of the filled up inner
bag from the outer box, transferring of the filled up inner bag or
for discharging of the contents contained in the inner box.
[0083] Further, although the upper fin part does not have influence
on the self-standing ability of the inner box directly, it is
possible to be cut off as well as the lower fin part so as to
improve the self-standing ability by making the center of gravity
lower, or not to be cut off so as to be used as a handle part when
the bag is handled. Furthermore, it is possible to prepare a
partial heat sealed part or a full heat sealed part.
[0084] According to the second invention, by preparing a not sealed
part or a cut out part at upper and/or lower side, the heat sealed
part in the corner part can be used as a handle part, consequently
it brings excellent effects such as easy work, good handling and
convenience in cases when a filled up inner bag is lifted without
an outer box, transferred or the contained liquid is
discharged.
* * * * *