JPH10310173A - Container with inner bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum can provided with a closed type inner bag into which or from which contents can be put and taken out without removing a drum can top lid and thus has good workability. SOLUTION: An inner bag 1 is formed by mounting a plastic circular top lid 6 provided with a resin stopper 5 having an outer screw and an inner screw excluding a skirt part 7 on the opening part of a tube shaped bag made of a plastic film. The inner bag 1 is placed in the body part of a metallic drum can or a plastic container, and the skirt part 7 is folded outward from the curl part 8 of the upper opening edge of the container body. The stopper 5 of the inner bag 1 is let out through the hole of the metallic or the plastic canopy 9 for the container body, a plug or a cap is engaged on the stopper 5, and the canopy 9 for the container body is fixed by fitting on the curl part 8 of the opening edge of the container body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container having an inner bag made of plastic film, which is used by being mounted inside a container having a removable canopy through an upper opening.

[0002]

2. Description of the Related Art In general, an open drum made of steel (hereinafter referred to as a drum can at the end) is formed into a body formed by forming a steel plate into a cylindrical shape and welding to form a circular body, as defined in JIS Z1600. Wrap the ground plate with a filler for sealing, place the removable canopy with the gasket for the canopy above the open top of the fuselage, put on the band,
It is fastened to the fuselage using bolts or levers. In addition, one or a plurality of bases serving as an inlet and a vent may be attached to a predetermined position of the canopy.
Drum cans are widely used in the chemical industry as containers for transporting and storing powders, solids, paints, adhesives, and viscous liquids of synthetic resins. The capacity of this drum can range from 20 liters to 200 liters.

[0003] If the contents put into the drum can contain components such as moisture and acidic components, the steel plate of the drum can is corroded, and the rust may contaminate or color the contents, resulting in quality problems. The inner surface of the drum can be provided with a chemical conversion coating such as zinc phosphate treatment,
It is rustproof by coating with epoxy / phenolic resin paint. However, in the case of contents with a high content of corrosive components and severe corrosiveness, polyethylene rust bags may be used inside drums because their rust prevention treatment has insufficient corrosion resistance. .

[0004] The inner bag is an open-type inner bag in which only the bottom is heat-sealed to a polyethylene-made body formed into a cylindrical shape, and a closed-type bag in which a canopy with a bottom and a spout is heat-sealed to the body. There are two types of interior bags. 0.2 ~
0.5 mm. (For example, actual fairness 1-148783
2)

[0005] The use of the inner bag for the drum can has the following advantages in addition to the improvement of the chemical resistance of the drum can. In other words, used drums are often used repeatedly after cleaning the inner and outer surfaces, but in the case of highly viscous or easily polymerizable contents such as paints and adhesives, the commonly used strong alkali Detergent is not easy to clean, and there is a problem that the cleaning efficiency of the drum can is extremely lowered. However, the use of the inner bag as described above makes the cleaning of the drum can very easy because there is little adhesion to the can. That's what it means.

[0006]

An open-type inner bag having only a bottom portion is mounted inside the drum, and the upper portion of the inner bag is folded back from the edge of the upper opening of the drum to the outside of the drum and fixed. After that, place the canopy of a regular drum and tighten it with a band before use. When putting the contents into or removing them from the drum, the top of the inner bag is opened with the top of the inner bag open, so the surrounding dust can easily enter the inside of the drum depending on the working environment. This is a management problem.

[0007] As a countermeasure, a polyethylene sheet with a hole opened in accordance with the position of the stopper of the can for the drum can is placed in the upper opening of the drum with the open-type interior bag as the can for the interior bag, and further placed thereon. There is an example in which a canopy for a drum with a stopper is fitted and used. In this case, if the spout of the drum can is opened, the contents can be put in or taken out while the can of the drum is still fitted, because the canopy for the interior bag below has a hole in advance.

[0008] In this case, there is no danger of dust getting into the drum. However, since the body and the canopy of the interior bag are not integrated, it takes time to mount the device and the space between the body and the canopy of the interior bag. There was a problem that the contents leaked from the. In addition, it is necessary to pay attention to the position of the stopper of the canopy of the inner bag and the stopper of the canopy of the steel drum can, which is troublesome.

[0009] In order to solve these problems, a closed-type interior bag in which a canopy with a plug is fused to a cylindrical body at the bottom and a canopy using a can with no plug is used. is there. In this inner bag, with the can lid of the drum removed, open the plug of the inner bag and put the contents into the drum, then close the stopper of the contents, close the can of the drum and tighten with a band. Transported from
At the customer's site, the user opens the top of the drum, opens the inner bag, and then removes the contents from the drum. In this case, the body of the interior bag and the canopy are integrated, and there is no problem in mounting and using the interior bag, but it is inconvenient that the canopy of the drum can must be opened when taking in and out the contents. On the other hand, when a closed-type interior bag is used for a canopy drum with a plug having a general shape, the canopy of the interior bag canopy cannot be inserted into the canopy of the drum can.

The present invention solves such a problem and provides a drum can equipped with a workable closed-type interior bag capable of putting contents in and out of the drum without removing the canopy of the drum. It is intended to provide.

[0011]

SUMMARY OF THE INVENTION A plastic having a resin spout provided with an external screw and an internal screw, which is bonded to the opening of a cylindrical bag made of a plastic film by heat fusion or an adhesive while leaving a skirt portion. Bag made of heat-sealed or adhesively bonded circular canopy made of aluminum, a plug or / and cap for a plug of the inner bag, and a metal or plastic provided with a curled portion at the upper opening edge And a metal or plastic canopy for the container body provided with a hole through which a plug of the interior bag can be inserted, and the interior bag is placed in the container body. The skirt portion is folded outward from the curled portion of the opening edge of the container body, the plug of the inner bag is put out of the hole of the canopy for the container body, and the plug for the plug is inserted into the plug. /and Fitting the cap, canopy the curling portion and the engagement fixing the container body of the opening edge of the container body, the inner bag with the container.

At the upper opening of a cylindrical bag made of plastic film, a skirt portion is left, and a throat portion and a resin spout having an edge at an upper edge thereof are bonded to each other by heat fusion or an adhesive. An inner bag made of a circular canopy bonded by heat fusion or an adhesive, an externally threaded plug for the plug, a metal or plastic container body provided with a curled portion at an upper opening edge, A metal or plastic canopy for a container body, provided with a cylindrical opening through which a plug of an inner bag can be inserted, and an external thread provided on the outer periphery of the cylindrical opening. Putting the inner bag into the body of the container, folding the skirt outward from the curl at the upper opening edge of the container, and inserting the stopper of the inner bag through the cylindrical opening of the canopy for the container body. And put it on the outside and plug it into the inner bag The edge is brought into contact with the top surface of the cylindrical opening of the container body canopy, and an external screw-type plug for the plug of the inner bag is attached to the external thread of the container body canopy. A container with an interior bag is fixed by engaging with the curl portion of the body of the container.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. When the thickness of the polyethylene film of the inner bag to be mounted on the drum can is 0.2 mm or less, preferably 0.15 mm or less, the work of mounting on the drum can is easier, and the disposal after use becomes easier. However, when the thickness of the film is small, the barrier performance against the components of the contents is inferior, and during long-term storage, the contents penetrate from the inner bag to the outside, and there is a concern that the components of the contents change. Therefore, a multilayer film in which an ethylene / vinyl alcohol copolymer having excellent gas barrier performance is sandwiched between linear low-density polyethylene resins having excellent chemical resistance and strength is used.

The structure when the interior bag 1 is mounted on a drum can will be described with reference to FIG. An inner bag 1 is fused to a cylindrical body 2 formed of a multilayer extrusion blown film by using a film of the same configuration as a bottom 3 and near a position corresponding to the inner height of a drum 4 above the cylindrical body. Then, the plug 5 molded by injection molding or vacuum molding is fused or bonded by an adhesive to a film of the same configuration which has been previously fused or bonded by an adhesive to form a canopy portion 6.

[0015] Until now, description has been made mainly of an inner bag in which a circular bottom is heat-sealed or adhered to a cylindrical body so that the inner surface of the steel drum can can be most closely attached to the inner shape of the drum. As described above, there are a three-way sealing type, a gusset type, and an envelope type for forming a plastic bag. Since the bottom of the bag is not circular, when it is mounted on the inner surface of a steel drum, corners are formed and the adhesion is inferior.However, there is an advantage that the forming of the bag is simple and the forming cost is low. A similar effect can be expected by attaching the canopy 6 with a plug according to the present invention.

A portion (referred to as skirt portion 7) of the cylindrical body having a length of 5 to 25 cm above the location where the canopy portion 6 of the inner bag 1 is fused is attached after the inner bag 1 is mounted inside the drum 4. Then, the drum 4 is turned out from the body curl portion 8 on the upper edge. The skirt portion 7 turned back from the body curl portion 8 of the drum can 4 fixes the interior bag 1 to the drum can 4, and
When the contents are put into the inner bag 1, the weight of the contents is supported by the inner bag 1 on average.

If the length of the skirt 7 is 5 cm or more, the inner bag 1 does not slip down due to the weight even when the contents are put therein, but the operation of turning the inner bag 1 outward from the body curl portion 8 is performed. At this time, if the end of the skirt portion 7 of the interior bag 1 is folded by hand, the work is easier if the length of the skirt portion 7 is about 10 cm. However, when mechanizing the folding operation of the inner bag 1, 5
cm is enough to work. If the length of the skirt portion 7 is too long, the film is wasted, and there is a problem that the display such as marking on the body of the drum 4 becomes difficult to see. Therefore, the length is about 25 cm or less, preferably about 10 cm.

In the removable canopy 9 of the drum 4, a circular hole 10 slightly larger than the outer shape of the plug 5 of the inner bag 1 is formed at a position corresponding to the plug 5 of the inner bag 1. After the interior bag 1 is mounted in the drum 4 and the skirt 7 is folded, the canopy 9 of the drum 4 is placed. At this time, the plug 5 of the inner bag 1 is inserted through the hole 10 of the canopy 9 of the drum 4.
Out of the hole 10.

Next, the resin support ring 11 is attached to the inner bag 1.
From the external thread of the plug 5 to fix the plug 5 of the interior bag 1 and the canopy 9 of the drum 4. It is preferable that a resin plug 16 provided with an external thread is attached to the inner screw of the plug 5 of the inner bag 1 and hermetically sealed.

When the contents are to be put into the drum 4 to which the inner bag 1 is attached, the inner bag 1 projecting outward from the hole 10 of the can 9 of the drum 4 with the canopy 9 of the drum 4 still tightened. The plug 16 of the spout 5 is opened to inject the contents, and the plug 16 is closed for shipment. When removing the contents from the drum, the plug 16 of the inner bag 1 may be opened and removed. In other words, after the inner bag 1 is mounted on the drum 4, it is not necessary to open or close the canopy 9 of the drum 4 at all, and the contents can be injected and taken out with the canopy 9 tightened. There is no contamination of the contents due to intrusion of dust in the working environment, and the easiness of work at the consumer is greatly improved.

A plug 5 that is previously heat-sealed to the canopy 6 of the interior bag 1
2 and 3 are shown in FIGS. FIG. 2 shows an inner screw-type plug 5 molded by injection molding. The spout 5 is a circular ring-shaped flange portion 12 for fixing the spout 5 and the canopy part 6 by heat-sealing or bonding to the plastic sheet of the canopy part 6 of the interior bag.
(For heat fusion, the thickness is preferably 0.5 to 1.5 mm), a male screw (outer screw) 13 on the outer surface, a female screw (inner screw) 14 on the inner surface, and a lower outer diameter on the upper outer peripheral portion. A large claw 15 is provided. The canopy 6 of the interior bag 1 that has been pre-drilled
Heat-sealed or bonded to The plug 5 of the inner bag 1 is taken out of the hole 10 of the canopy 9 of the drum 4, and then a resin support ring 11 formed by injection molding is attached to the plug 5 of the inner bag 1.
To fix the inner bag 1 and the canopy 9 of the drum 4.

After the contents are put in the inner bag 1, a plug 16 made of resin is attached along the inner screw 14 of the plug 5 of the inner bag 1. A plug 17 made of rubber or polyethylene is attached to the plug 16 to prevent the contents from leaking. After tightening the plug 16, the sealing cap 18
Is put on the spout. The seal cap 18 is provided with two cuts parallel to the upper surface and a claw portion 19 having a small inner diameter at the lower side around the cut. The seal cap 18 cannot be easily removed. If the seal cap 18 is forcibly removed, the seal cap 18 is broken at the cut on the upper surface of the seal cap 18, so that it functions as a seal after the contents are put. Plug 16 or seal cap 1
8 can be omitted. Plug 16
When the plug is not used, the inner screw 14 of the plug 5 may not be provided, but the sealing performance is inferior to that of the plug 16.

FIG. 3 shows a plug for an inner bag used for a drum using a well-known externally threaded can lid for a drum. The spigot is attached to a lower surface of a flange portion 20 that is fused or adhered to the canopy portion 6 of the interior bag 1, a cylindrical throat portion 21 perpendicular to the flange portion 20, and an upper edge portion 22 of the throat portion 21. A circular ring 27 made of an adhesive or a rubber or a thermoplastic elastomer having a large friction coefficient. The entire thickness including the brim portion 20 to the throat portion 21 is 0.
It is made of a thin resin of 1 to 0.5 mm, and is easy to handle. In the cylindrical opening 24 of the canopy 9 of the drum 4,
A known outer screw 23 is attached, and the throat portion 21 of the plug 5 of the inner bag 1 is attached to the cylindrical opening 24 of the canopy 9 of the drum 4.
To the outside, and the cylindrical opening 24 of the canopy 9 of the drum 4
The top surface 24a of the inner bag 1 and the upper edge 22 of the plug 5 of the interior bag 1 are bonded and fixed with a circular ring 27. After inserting the contents, a known external thread type plug 25 is used. To this, a packing 26 for preventing leakage of the contents is attached.

The adhesive of the circular ring 27 on the lower surface of the upper edge portion 22 of the throat portion 21 of the plug of the interior bag 1 is an acrylic resin-based pressure-sensitive adhesive having an adhesive strength of about 10 to 30 g / cm. It is. The inner bag 1 includes a body curl portion 8 of a drum 4.
Since it is sufficiently fixed and held by the skirt portion 7 turned outward from the outside, it is sufficient that the plug of the inner bag 1 is lightly fixed so as not to be twisted by friction when the external screw plug 25 is closed. Even if rubber or a thermoplastic elastomer having a large coefficient of friction is attached, twisting of the interior bag can be prevented. When the packing 26 attached to the outer screw plug 25 is made of rubber, friction is large. When closing the outer screw plug 25, the plug 5 of the inner bag 1 may be twisted. If the product is made of small friction,
Since the plug 5 of the inner bag 1 is not twisted, an adhesive is not required for the upper edge 22 of the inner bag 1 in this case. In this case, the upper edge 22 of the plug 5 of the inner bag 1 is the drum 4
Only need to be hooked on the top surface 24a of the cylindrical opening 24 of the canopy 9.

The inner screw type inner bag spout shown in FIG. 2 has a strong shape formed by injection molding, but the outer screw type inner bag spout stopper shown in FIG. The diameter is larger than the inner diameter of the cylindrical opening 24 of the container body canopy 9, but the plug is formed by vacuum forming and the wall thickness is 0.1 m.
m to 0.5 mm, so that it is soft and flexible, so that the cylindrical opening 24 of the container body canopy 9 is easily taken out by forcible pressing, and the cylindrical opening 24
Can be hooked and fixed to the top surface 24a. Further, the externally threaded plug shown in FIG. 3 is characterized in that the amount of resin used is small and inexpensive, and furthermore, disposal after use is easy.

Conventionally, a closed-type interior bag with a plug has been used. However, if the plug is taken out of the hole of the canopy of the drum and fixed and used, when the contents are put into the bag, the contents can be removed. Since the load is concentrated on the fusion portion between the plug of the inner bag and the canopy of the inner bag, and the load is easily broken, it is not practically used, and the method is not fixed to the drum canopy. But,
In the method according to the present invention, since the skirt portion 7 of the inner bag is used by being folded outward from the body curl portion 8 of the drum, the load of the contents is reduced by the skirt portion 7 of the inner bag 1 at the body curl portion 8 of the drum 4. The inner bag 1 is supported, and the load applied to the plug 5 of the inner bag 1 is very small. Therefore, even if the plug 5 of the inner bag 1 is fixed to the canopy 9 of the drum 4, the inner bag 1 does not break. In the description of the present invention, a 200-liter drum can has been described as an example. However, the same can be applied to a drum of other capacity, a pail can, or a similar plastic drum.

[0027]

EXAMPLE A three-layer, five-layer, 0.1 mm-thick co-extruded film sandwiching an ethylene-vinyl alcohol copolymer with an adhesive in a linear low-density polyethylene was used. Cylindrical interior bag (height 85c) with a circular canopy with a molded resin spigot heat-sealed
m, outer diameter 57cm, skirt length 15cm)
Put it in a liter drum and fold the skirt of the inner bag outward from the body curl of the drum. Place the top of the drum can, pull out the plug of the interior bag from the opening of the top of the drum can, fix the interior bag and the top of the drum can with a resin support ring, hang a band, and bolt the top of the drum and the body with bolts Was tightened. With the can of the drum still attached, the plug of the inner bag was opened, and 150 liters of water was put therein, and the plug was closed.

After rolling the drum over the floor for 20 m on its side, the top of the drum was opened slightly and the inside was observed to check for damage to the inner bag and water leakage, but there were no problems. After the end of the test, the water in the drum was discharged from the plug of the inner bag with a suction pump while the lid of the drum was kept attached. It is not necessary to remove the canopy of the drum when inserting or taking out the contents as in the case of the conventional interior bag, and the workability has been significantly improved.

For comparison, the inner bag from which the skirt was removed was attached to a drum, and 200 liters of water was similarly added without removing the plug of the inner bag from the can of the drum. When the roll-over test was performed, there was no breakage or water leakage of the inner bag. However, this type of interior bag is troublesome because it is necessary to remove the canopy of the drum when the contents are taken in and out. On the other hand, when the same test was conducted with the inner bag mouth plug pulled out of the drum can lid, the film was damaged due to the twist of the inner bag near the junction between the stopper and the inner bag can lid, causing water leakage. I was When the plug of the inner bag is taken out from the opening of the drum can, it is clear that the effect of fixing and holding by the skirt portion of the inner bag is very large.

[0030]

According to the present invention, a drum with an inner bag is provided.
Since the skirt portion of the inner bag is folded back at the curl portion of the drum can, supported by the curl portion, and held down by the canopy, the inner bag can be easily, securely and securely attached to the drum can.

Since the cap of the inner bag is designed such that the size and the position of the can cap correspond to the hole of the can of the drum, it is easy to insert the cap of the inner bag into the hole of the can of the drum. It is.

Since the canopy of the interior bag is integrated with the body, the contents do not leak in the drum.

Since the plug of the inner bag protrudes outside the can of the drum can, there is no need to remove the can of the drum for taking in and out of the contents, and the contents can be easily taken in and out.
Since the contents are taken in and out with the spout, there is no danger of dust entering the interior bag.

[Brief description of the drawings]

FIG. 1 is a sectional view of a steel open drum with an interior bag.

FIG. 2 is a cross-sectional view of an inner screw type plug of the interior bag.

FIG. 3 is a sectional view of an externally threaded plug of the interior bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Interior bag 2 Body 3 Bottom 4 Steel drum 5 Spout 6 Canopy part 7 Skirt part 8 Curl part 9 Canopy 10 Hole 11 Support ring 12 Collar part 13 Outer screw 14 Inner screw 15 Claw 16 Plug 17 Packing 18 Seal cap 19 Claw Part 20 Collar part 21 Throat part 22 Upper edge part 23 External screw 24 Cylindrical opening 24a Top surface 25 External screw type plug 26 Packing 27 Circular ring

Claims (2)

[Claims] 1. A plastic canopy in which a resin spout provided with an external thread and an internal thread is bonded to the opening of a cylindrical bag made of a plastic film by heat-sealing or an adhesive while leaving a skirt portion. An inner bag formed by adhering portions of the inner bag with a heat seal or an adhesive, a plug or / and a cap for a plug of the inner bag, and a metal or plastic container body provided with a curled portion at an upper opening edge. A metal or plastic canopy for the container body provided with a hole through which a plug of the inner bag can be inserted, the inner bag is put into the container body, and the skirt portion is The container body is folded outward from the curled portion of the opening edge thereof, the plug of the inner bag is put out of the hole of the canopy for the container body, and the plug or / and cap for the plug is fitted to the plug. , A container with an inner bag, wherein a canopy for the container body is fixedly engaged with a curled portion of an opening edge of the container body. 2. A throat portion, leaving a skirt portion at an upper opening of a cylindrical bag made of plastic film,
An inner bag made of a plastic canopy having a resin spigot having an edge at its upper edge bonded by heat fusion or adhesive; A mold plug, a metal or plastic container body provided with a curled portion at an upper opening edge, and a cylindrical opening through which a plug of the inner bag can be inserted; A metal or plastic canopy for the body of the container, provided with external threads on the outer periphery; the inner bag is placed in the body of the container, and the skirt is folded outward from the curl at the upper opening edge of the container. The stopper of the inner bag is inserted through the cylindrical opening of the canopy for the container body and is drawn out, and the edge of the stopper of the inner bag is capped at the top of the cylindrical opening of the canopy for the container body. Surface of the inner bag, and the external thread Of the mounting external thread plug, the container body for canopies and container body curl portion and engaging a fixed inner bag with the container comprising.