JPH11130095A - Inner bag with bottom held flat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate attachment of an inner bag to a container and to prevent the bottom of the inner bag from being sucked in the case of suction by a pump by a method wherein a face plate made of rigid material is provided at the bottom of the inner bag made of a thin sheet. SOLUTION: An inner bag 1A is formed, with cut-off lower end of the cylindrical trunk part sheet 1a fitted for setting to the peripheral end of a rigid face plate 3 in a shape corresponding to the bottom 2b of a drum and with the end of the trunk part sheet turned up to the inside and joined directly to the face of the rigid face plate 3 by heat sealing or the like. On putting the inner bag 1A into a drum main body 2, the inner bag can be inserted smoothly into the center of the bottom plate 2b of the drum main body without twist or swallowing-up of air since the rigid face plate 3 for the bottom is capable of keeping its flatness constantly. When liquid contents if pumped up with a suction port connected to a suction pump lowered to the bottom of the inner bag 1A put in the drum 2, the liquid contents can be discharged easily because the bottom of the inner bag 1A is not sucked up to the suction port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an inner bag made of a resin film used in various containers such as an open drum.

[0002]

2. Description of the Related Art Conventionally, an open drum or the like is used as one of means for reusing a container such as a drum for a liquid which needs cleaning or is difficult to clean, and mainly has a low level inside. The inner bag of the high density polyethylene sheet is attached to form a two-layer type, and this inner bag is attached and detached, and there are many methods of replacing the inner bag. Since it is difficult to bend inside and fuse, a method of vacuum-machining the bottom sheet into a dish shape and then fusing the periphery with the body has been adopted. Therefore, there was no idea other than the manufacturing method using a thin sheet for both the body and the bottom of the inner bag. Therefore, in the conventional product, it is not easy to attach the container to the container because the container is twisted or the air is entrained. In addition, when the content liquid is sucked up by a pump, or when stirring is required inside the container, the use of the inner bag is avoided because the inner bag is sucked to the suction port of the pump that has been charged or entangled with the stirrer. Often, containers were used without being used.

[0003]

Recently, cleaning is required,
When handling difficult liquids in containers such as drums, the use of open drums for the purpose of container reuse and the use of inner bags such as low-density polyethylene sheets inside the cans are increasing, but In particular, in the case of a low-density polyethylene sheet, since the inner bag sheet is thin and thin, it is not easy to mount it on a container, and when sucking the sheet when sucking up the content liquid with a pump, or when stirring. In many cases, the inner bag was not used due to problems such as entanglement, and the contents were immediately received in the drum. Therefore, most containers are disposed of as industrial waste with the contents liquid attached,
Alternatively, the cleaning was unavoidably expensive. The present invention has been devised in view of such a problem. By providing a face plate or a dish member made of a hard material at the bottom of an inner bag made of a thin sheet, the inner bag can be easily attached to a container. Or to provide an inner bag of a type that has not been conventionally provided to prevent suction of a sheet at the time of inhalation by a pump and to easily perform stirring of a liquid content. An object of the present invention is to replace a bag, thereby enabling the container to be repeatedly used without washing, to save resources, and to improve economic efficiency by reducing distribution costs.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention employs an open-drum having an open top as a container and has a two-layer structure using an inner bag. With a bottom hard face plate integrally formed by joining a flat plate made of a hard resin that can be joined to the lower end of the inner bag and heat welding etc. to the bottom of the cylindrical vertical type body made of low density polyethylene sheet By using the inner bag, the planar shape of the bottom portion of the inner bag is maintained, so that the inner bag can be easily attached to the container, and the bottom suction port can be prevented from being sucked by the pump.

[0005] In addition, in the case where the mixing of the contents liquid or the mixing of the accelerator or the curing agent is performed in the container, the inner bag made of a thin sheet is prevented from being entangled with the stirrer. A tub-shaped dish member made of a hard resin material or the like is provided at the bottom, and the inner periphery of the book member is joined to the lower end of the inner bag tubular body to provide an inner bag integrally formed with the bottom dish member. The purpose of this is to solve the problem.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway view showing a state in which an inner bag 1A with a bottom hard face plate 3 made of a sheet of a low-density polyethylene or the like embodying the present invention is mounted in an open drum main body 2, a cover 4, and a cover sheet 5. The lower end of the body 1a of the inner bag having an open upper portion is joined to the hard face plate 3 by heat fusion or the like to form an integral inner bag 1A. Therefore, when the inner bag 1A itself is mounted in the drum main body 2, the bottom hard face plate 3 can always maintain the planar shape, so that it can be smoothly inserted into the center of the drum main body bottom plate 2b without twisting or entrainment of air. The air remaining between the bag 1A and the drum main body 2 is brought into close contact by sucking out the air with a vacuum cleaner or the like, so that mounting which has been troublesome and troublesome until now becomes extremely easy. Also, when the content liquid is pumped up, when the suction port connected to the pump is lowered to the bottom of the inner bag 1A mounted in the drum 2 to suck up the content liquid, the hard face plate 3 is provided at the bottom, so the inner bag is provided. There is no need to worry about sucking the bottom sheet of 1A into the suction port, making it possible to easily discharge the content liquid. In addition, since the inner bag 1A with the bottom hard face plate 3 according to the present invention has the above-described structure, at the time of manufacture, a cylinder is provided at the peripheral end of the hard face plate 3 having a shape corresponding to the drum bottom 2b. The cut-out lower end of the inner bag body sheet 1a is fitted and set, and the end is folded inward to be directly joined to the surface of the hard face plate 3 by heat fusion or the like. Therefore, because heat fusion in one step is possible,
Compared with the case where the hard face plate 3 is double-bonded to the bottom of the completed inner bag, it has a great cost advantage. still,
The upper open-type inner bag 1A has its upper end folded back to
Is set on the upper edge portion of the cover, a cover sheet 5 is put on the cover from above, and the cover 4 is fixed with a coupling 6 or a bolt via packing. Further, since a liquid injection port 4a is usually provided in the lid 4, a lid sheet 5 is provided.
Is also provided with a liquid injection port 5a. Further, although not shown, the inner bag may be formed into an integrally molded shape in which a lid sheet and a main body sheet are joined to each other and a manhole or a pouring opening is provided at an upper portion. Alternatively, instead of the bottom hard face plate member 3, a soft material of the same quality as that of the inner bag body portion 1a may be provided with a large thickness to achieve the same purpose.

FIG. 4 shows a second embodiment of the present invention, which is separately molded on the bottom of an inner bag made of a sheet of low-density polyethylene or the like and made of a material which can be joined by heat fusion or the like. Inner bag 1C integrally provided with tub-shaped dish member 7
Is a partially cutaway view of the lower part of the inner bag 1C.
The opened lower end of the cylindrical body 1a is
And is integrally formed with the outer peripheral portion thereof. Therefore,
In the case where the mixing and mixing of the content liquid or the stirring by the addition of the hardening material or the like is performed in the drum 2, the content liquid can be stirred without the sheet of the inner bag 1 </ b> C being entangled with the stirring blade 8.

[0008]

According to the present invention, a flat hard face plate member is provided at the bottom of an inner bag made of a resin sheet used in various cylindrical vertical open-top containers such as drums as described above. The inner bag is configured to be detachable into the container while holding the planar shape of the bottom portion of the inner bag, or has the following excellent effects as an inner bag structure in which a saucer-shaped member is provided and joined. . Conventionally, when an inner bag such as a low-density polyethylene sheet is mounted in a container, it is very difficult to mount the inner bag itself because the inner bag itself is a thin film-like sheet. By using the inner bag of the structure provided with the plate, the attachment to the container becomes very easy, and the workability can be improved. In containers such as drums, washing of the contents is required,
By replacing the inner bag even when it is difficult to wash the contents, it is not necessary to dispose of the container with the contents liquid attached as before, it is possible to save resources by collecting, and to reduce the distribution cost. In particular, the inner bag can be used without pumping up the content liquid or sucking or entanglement even when stirring is required. In particular, in the case of the inner bag with the bottom hard face plate member of the present invention, the cut end of the tubular body sheet is bent inward directly to the end of the peripheral surface of the hard face plate member by heat fusion or the like. Since the joining method is possible, it can be manufactured in one process, which is a very large cost advantage compared to the case of joining the hard plate etc. to the bottom part after molding the inner bag for the same purpose. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective front view showing a state in which an inner bag of a polyethylene sheet provided with a hard face plate joined to a bottom is mounted in a container, and a partially cut-away cross section is shown.

FIG. 2 is an enlarged cross-sectional view of the lower part of the inner bag of FIG.

FIG. 3 is an inner bag of a manufacturing method based on a conventional manufacturing method, in which a bottom sheet is provided with a rise.

FIG. 4 is a partially cutaway view in a lower perspective enlarged view showing a state in which a tub-shaped hard dish member is joined to the bottom of the inner bag and integrally provided.

[Description of sign]

1A; Inner bag body provided with a hard face plate at bottom 1B; Inner bag of conventional manufacturing method 1C; Inner bag body provided with saucer at lower part of body 1a; Inner bag body sheet 1b; Conventional vacuum processed inner bag bottom sheet 2; container 2a; container body
2b; container bottom part 3: bottom hard face plate 4: container lid
4a; Container lid pouring port 5; Lid sheet 5a; Lid sheet pouring port 6; Band coupling 7;
8; stirring blade

Claims (2)

[Claims] 1. A two-layer resin film (hereinafter referred to as a sheet) in a container (hereinafter referred to as a drum) having an open-top type in which various cylindrical vertical lids such as a drum for filling an inner solution are detachable. The inner bottom bag (hereinafter referred to as the inner bag) having an open top is formed by cutting off a lower part of a cylindrical body sheet, and a hard face plate member is provided at a bottom portion, and a peripheral end of the hard face plate member is provided. The lower end of the body sheet is bent inward to the inside, and joined by heat fusion or the like to form an integrally molded inner bag, and an upper open-type bottom flat holding type detachably mounted in the drum. bag. 2. A lower part of the cylindrical body of the resin sheet inner bag mounted in the main body container having an open top has a constant depth equal to the projected area of the cylindrical body. A bottom member provided with a dish member, a peripheral portion of the dish member and a lower end of the inner bag body sheet are joined to form an inner bag having an integral structure, and is configured to be detachable in the main body container. 2. The bottom flat-type inner bag according to claim 1, wherein the inner bag has an open top with a dish member.