Package making – Methods – Plural covers
Reexamination Certificate
1997-10-24
2001-03-06
Vo, Peter (Department: 3721)
Package making
Methods
Plural covers
C141S010000, C141S114000, C141S251000, C141S313000, C383S906000
Reexamination Certificate
active
06195964
ABSTRACT:
TECHNICAL FIELD
The present invention relates to an inner bag for loading into a cylindrical container and, more particularly, relates to an inner bag which is utilized to fill a moisture-curing resin or another material when the moisture-curing resin or the another material is filled into a cylindrical container such as a drum.
BACKGROUND ART
When viscous materials such as adhesive, sealant, or paint are filled into a cylindrical container such as a drum, it is common practice to fill the viscous materials into an inner bag after loading the inner bag into the drum so as to prevent the viscous materials from adhering to the inner surface of the drum; otherwise the drum would not be reusable.
FIG. 5
shows the structure of the conventional inner bag used for this purpose. This inner bag, indicated by reference numeral
50
, generally comprises a cylindrical portion
54
and a circular sheet
56
forming the bottom of the inner bag
50
. The cylindrical portion
54
consists of two rectangular sheets
52
which are bonded together at two side edges, indicated by
53
, by heat-seal techniques. The circular sheet
56
is further bonded to the cylindrical portion
54
at the periphery
58
of the bottom also by heat-seal techniques.
The manner in which the viscous materials are filled into and discharged from the inner bag
50
as described above is illustrated in FIGS.
6
(
a
)-
6
(
e
). FIGS.
6
(
a
)-
6
(
e
) show that a sequence of steps begins with installing of the inner bag
50
in the cylindrical drum and ends with discharging the viscous materials from the inner bag. This sequence of steps is hereinafter described briefly. A pump for filling under pressure the viscous materials toward the bottom of the drum, indicated by
23
, has a follower plate
31
. The inner bag
50
is installed at its one end on the follower plate
31
. Under this condition, the viscous materials, indicated by
27
, are filled into the inner bag
50
, as shown in FIG.
6
(
a
). Then, the other end
11
of the inner bag
50
is closed to form a closed portion
12
, as shown in FIG.
6
(
b
). The drum
23
is inverted so as to overlap a separate drum
24
, and the inner bag
50
of the drum
23
is transferred into the separate drum
24
in such a manner that the closed portion
12
of the other end
11
of the inner bag
50
is brought into contact with the bottom of the separate drum
24
, as shown in FIG.
6
(
c
). Subsequently, the drum
24
is closed with a top cover
26
, as shown in FIG.
6
(
d
). When the viscous materials
27
are discharged at a consumer's site, the top cover
26
is removed and then the bottom
21
of the inner bag
50
is cut with a cutter knife or the like to form an opening. The viscous materials
27
are discharged through a central opening
33
of the follower plate
31
of the pump, as shown in FIG.
6
(
e
).
A reason why the viscous materials
27
are filled into and discharged from the inner bag by the method described above is follows. In the case where the viscous materials
27
are a moisture-curing resin, air remaining in the closed portion of the other end
11
of the inner bag
50
and moisture in the air serve to cure surface portions of the viscous materials
27
which are located in adjacent to the closed portion. Therefore, the inner bag
50
of the drum
23
is transferred to the separate drum
24
in the inversion manner, that is, is turned upside down. Accordingly, the uncured portion of the materials which are in the bottom of the inner bag
50
of the drum
23
can be discharged firstly.
In addition, in the case where the conventional cylindrical inner bag
50
as described above is utilized, following problems are occurred. As shown in
FIG. 5
, the inner bag
50
is fabricated by bonding the cylindrical portion
54
to the circular sheet
56
forming the bottom at the periphery
58
of the bottom by heat-seal techniques. The cylindrical portion
54
is obtained by bonding together the two rectangular sheets
52
at two side edges by heat-seal techniques. Therefore, it is difficult to subject the circular sheet
56
to a heat-seal operation. Sometimes, some portions of the sheet do not sufficiently undergo the heat-seal operation. In this case, when the inner bag is kept in stock or being delivered to consumer's site, air containing moisture enters the inner bag
50
, as a result of which there is a possibility that the moisture-curing resin on the bottom
21
as well as the resin in the closed portion
12
is cured. Furthermore, the heat-seal operation is difficult to carry out. This results in an increase in the cost.
When the cylindrical inner bag
50
accommodating the viscous materials
27
and loaded on the cylindrical container such as a drum is transferred into other drum, if one tries to invert the loaded drum in order to transfer the inner bag
50
, any gap is not easily formed between the outer periphery of the inner bag and the inner wall of the drum, due to the fact that the inner bag
50
has a cylindrical contour which is substantially coincided with that of the drum. Therefore, the bottom portion of the loaded drum is placed in a vacuum condition. Hence, the inner bag
50
is not easily dropped off from the inverted drum. In this way, it is difficult to transfer the inner bag.
With this conventional art inner bag
50
, the permeability of air deteriorates the quality of the viscous materials
27
. The cost is increased because it is difficult to perform the heat-seal operation. Furthermore, the transfer operation is not carried out efficiently. These are problems in the conventional technique.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an inner bag which is free of the foregoing problems with the conventional techniques, is adapted for loading into a cylindrical container, has excellent airtight characteristics, is economical to fabricate, and facilitates transferring the same between the cylindrical containers.
An inner bag according to the present invention comprises two hexagonal first sheets and two pentagonal second sheets. Each first sheet has a pair of opposite sides extending longitudinally and a trapezoidal portion around one longitudinal end of the sheet. Each second sheet has a pair of opposite sides extending longitudinally and a triangular portion around one longitudinal end of the sheet. The first and second sheets are placed in an opposite relation to each other when the inner bag is in an unfolded condition. The peripheries of the first and second sheets, excluding the other ends, are bonded together by heat-sealing.
In the aspect of the invention, each of the first and second sheets may be a laminate sheet using aluminum.
The inner bag, according to the present invention, adapted to be loaded into a cylindrical container is fabricated in the manner described now. The top sides of the trapezoidal portions around the longitudinal ends of the two first sheets are bonded together by heat-sealing; one of the two non-parallel sides of the trapezoidal portion of each of the two first sheets and one of the two sides of the triangular portion of one of the second sheets are bonded together by heat-sealing; and the other one of the two non-parallel sides of the trapezoidal portion of each of the two first sheets and the other one of the two sides of the triangular portion of one of the second sheets are bonded together by heat-sealing, in such a manner that the bottom of the inner bag is defined by the trapezoidal and triangular portions. Further, the pair of opposite sides of the first sheets are respectively bonded with the pair of opposite sides of the second sheets. However, no heat-sealing is applied to the sides opposite to the trapezoidal and triangular portions and thus an opening is at this location. Thereby, the inner bag in the form of a baglike-shaped container having a closed bottom and an opened top can be easily constituted by applying the heat-sealing to straight or planar portions of the first and second sheets.
In the case where the angle made by the two sides n
Desai Hemant M.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Sunstar Engineering Inc.
Vo Peter
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