EP1497188B1 - Plastic container - Google Patents

Abstract

The invention relates to a multi-layer plastic container ( 10 ) for the storage and transport of materials in particular with an explosion risk, comprising at least two layers of plastic, whereby the inner layer ( 14 ) is not electrically conducting and the outer layer ( 12 ) is electrically conducting. According to the invention, an electrostatic charging of the plastic container or/and the inner filled material with a risk of explosion may be avoided, whereby a permanent electrical connection between the inner packed material and the base on which the plastic container ( 10 ) is mounted is provided which guarantees a secure discharge of electrostatic charging of the container body or the packed material to the base.

Description

The invention relates to an industrial packaging container made of plastic (HD-PE) such. B. a bung barrel, a lidded barrel, a canister or an inner container for a pallet container (IBC). Such packaging containers or barrels are used for storage and transport in particular of combustible or explosive liquid or solid products used.

A bung barrel usually has a cylindrical barrel sheath, a disc-shaped barrel bottom and a corresponding barrel top. In the transition region between barrel shroud and barrel top a circumferential carrying and transport ring (handling ring = L-ring) is provided. In the barrel upper floor, at least one bunghole opening arranged in a countersunk bung housing (bung cavity) is formed with a raised bung. In a lidded barrel the open-top barrel body is closed with an attached barrel lid and clamping ring closure. The drum lid can also be provided with bung openings. Canisters and IBC inner containers are closed with appropriate screw caps.
Any packaging container suitable for the storage and transport of particularly dangerous liquid products must be tested and approved by an official approval authority. The container must meet certain requirements and, for example, have sufficient stack load, drop resistance and tightness.
When using the packaging container for flammable contents or
Liquids must be taken to ensure that in the manipulation of the container, especially when filling or emptying, no electrical charging and sparking to avoid an explosion of evaporating gas mixtures can occur.

In GB 2 219 270 A, for example, a plastic container for flammable products disclosed. This plastic container is around the filling opening, along an outside of the Container and provided around the container bottom with an electrically conductive coating, to dissipate occurring electrostatic charges. For optimal protection In addition, the inner side of the filling opening and the inner surface are also guaranteed of the container provided with an electrically conductive coating.

It is therefore an object of the present invention to provide an industrial packaging container of the type mentioned for storage and transport of particular combustible products (liquids), which can be used due to its special structural design in hazardous areas.

This object is achieved in the packaging container made of plastic (electrically dissipative plastic container) solved by the characterizing part of claim 1.

The dependent claims contain further advantageous embodiment variants of Invention.

• die elektrisch leitfähige Verbindung zwischen dem flüssigen Füllgut und der leitfähigen äußeren Behälterschicht über einen permanent eingebauten leitfähigen Ableitstab und über einen eingeschraubten, gleichfalls leitfähigen Spundstopfen erreicht wird, in welchen der Ableitstab eingesetzt ist, und welcher im eingeschraubten Zustand mit der leitfähigen Außenseite des Faßkörpers in elektrisch leitfähigem Kontakt steht,
• der Ableitstab etwa zwischen 3 % und 30 % länger ausgebildet ist als die Höhe des Behälters, derart, daß der Ableitstab von dem leitfähigen Spundstopfen bis in den entferntesten Bereich des Behälterunterbodens reicht,
• die elektrische Verbindung zwischen dem flüssigen Füllgut im Inneren und der elektrisch leitfähigen Außenseite des Behälterkörpers über einen besonderen zusätzlichen, in den Unterboden des Behälterkörpers eingeschraubten, gleichfalls leitfähigen Schraubstopfen erreicht wird.
• die elektrische Verbindung zwischen dem flüssigen Füllgut im Inneren und der elektrisch leitfähigen Außenseite des Behälterkörpers über einen besonderen in den Unterboden des Behälterkörpers eingeschweißten oder eingespritzten Stopfen aus leitfähigem Kunststoff erreicht wird.
• die elektrische Verbindung zwischen dem flüssigen Füllgut im Inneren und der elektrisch leitfähigen Außenseite des Behälterkörpers über wenigstens eine vorzugsweise im Unterboden des Behälterkörpers vorgesehene Wandungseinformung erreicht wird, wobei die aus leitfähigem Kunststoff bestehende Außenschicht in das Innere des Behälterkörpers eingeformt ist und mit dem flüssigen Füllgut in Kontakt gelangt.

The inventive design of the dissipative plastic container is characterized in particular by the fact that

• the electrically conductive connection between the liquid product and the conductive outer container layer via a permanently installed conductive Ableitstab and a screwed, also conductive bung plug is achieved, in which the Ableitstab is inserted, and which in the screwed state with the conductive outside of the barrel body in electrically conductive contact,
• the diverter rod is formed between about 3% and 30% longer than the height of the container such that the diverter rod extends from the conductive plug to the remotest region of the container bottom,
• the electrical connection between the liquid filling material in the interior and the electrically conductive outside of the container body is achieved by way of a special additional threaded plug which is likewise screwed into the underbody of the container body.
• the electrical connection between the liquid filling material in the interior and the electrically conductive outside of the container body is achieved via a special plug of conductive plastic which is welded or injected into the underbody of the container body.
• the electrical connection between the liquid filling material in the interior and the electrically conductive outer side of the container body is achieved via at least one wall depression preferably provided in the underbody of the container body, wherein the outer layer consisting of conductive plastic material is molded into the interior of the container body and in contact with the liquid contents arrives.

Other important and inventive features of the presented new Packaging containers are apparent from the drawings.

Figur 1

ein erfindungsgemäßes Kunststoff-Spundfaß,

Figur 2 a

einen Spundstopfen mit eingesetztem Tauchrohr,

Figur 2 b

einen Spundstutzen des Spundfasses gemäß Fig. 1,

Figur 2 c

den in den Spundstutzen eingeschraubten Spundstopfen,

Figur 3 a

eine Siegelkappe für einen Spundstopfen,

Figur 3 b

einen Spundstopfen mit aufgesetzter Siegelkappe und eingestecktem Tauchrohr,

Figur 3 c

einen anderen Spundstutzen,

Figur 3 d

den in den Spundstutzen eingeschraubten Spundstopfen gem. Fig. 3 b,

Figur 4 a

einen besonderen Boden-Spundstutzen,

Figur 4 b

eine vergrößerte Darstellung des in den Faßunterboden eingeschraubten Boden-Spundstutzen gem. Fig. 4 a,

Figur 5 a

einen besonderen Boden-Kunststoff-Stopfen,

Figur 5 b

den in den Faßunterboden eingesetzten K'stoff-Stopfen gem. Fig. 6a,

Figur 6 a

einen mit der äußeren Schicht verbundenen Kunststoff-Stopfen,

Figur 6 b

eine vergrößerte Darstellung des im Faßunterboden angeordneten Kunststoff-Stopfen gem. Fig. 6 a,

Figur 7 a

eine besondere Ausgestaltung der nach innen führenden äußeren Kunststoff-Schicht,

Figur 7 b

eine vergrößerte Darstellung des im Faßunterboden angeordneten, nach innen führenden äußeren Kunststoff-Schicht gem. Fig. 7 a,

Figur 8

eine Teilschnittdarstellung im Faßoberboden / Spundbereich,

Figur 9

eine Teilschnittdarstellung/Seitenansicht eines weiteren Spundfasses,

Figur 10

eine Seitenansicht eines erfindungsgemäßen Palettencontainers,

Figur 11

eine Teilschnittdarstellung eines Palettencontainers,

Figur 12

eine Seitenansicht eines erfindungsgemäßen Kunststoff-behälters und

Figur 13

eine Seitenansicht eines erfindungsgemäßen Kunststoff-Kanisters

The invention will be explained and described in more detail with reference to embodiments shown in the drawings. Show it :

FIG. 1

an inventive plastic bung barrel,

Figure 2 a

a bung plug with inserted dip tube,

FIG. 2 b

a bung of the bung barrel of FIG. 1,

Figure 2 c

the bung plug screwed into the bung,

Figure 3 a

a sealing cap for a bung plug,

FIG. 3 b

a bung plug with attached seal cap and inserted dip tube,

FIG. 3 c

another bung,

FIG. 3 d

the bung plug screwed into the bung acc. 3 b,

Figure 4 a

a special ground spigot,

FIG. 4 b

an enlarged view of the screwed into the barrel bottom floor bung according to. 4 a,

Figure 5 a

a special soil plastic plug,

FIG. 5 b

the K'stoff plug used in the barrel underbody gem. 6a,

Figure 6 a

a plastic plug connected to the outer layer,

FIG. 6 b

an enlarged view of the arranged in the barrel bottom plastic plug according to. Fig. 6a,

Figure 7 a

a special embodiment of the inward-leading outer plastic layer,

FIG. 7b

an enlarged view of the arranged in the barrel bottom, leading inward outer plastic layer acc. Fig. 7a,

FIG. 8

a partial sectional view in the barrel top floor / bung area,

FIG. 9

a partial sectional view / side view of another bung barrel,

FIG. 10

a side view of a pallet container according to the invention,

FIG. 11

a partial sectional view of a pallet container,

FIG. 12

a side view of a plastic container according to the invention and

FIG. 13

a side view of a plastic canister according to the invention

In Figure 1 is shown as an exemplary embodiment, a two-layer, produced in the coextrusion blow molding 220 I plastic drum 10 (220 I L-ring barrel PLUS, electrically dissipative), which is electrostatically protected by a conductive plastic outer layer 12 and an electrical connection between the Liquid (medium) and the conductive outer layer. The inner non-conductive plastic layer 14, which comes into contact with the contents, consists of neutral plastic (HD-PE). The outer side of the drum (eg black plastic outer layer by carbon black addition) consists of a conductive plastic (surface resistance 1.1 kΩ to 1.4 kΩ) over the entire surface. Here, a secure electrical connection between the liquid in the interior and the electrically conductive outside of the barrel body is given. The electrically conductive connection between the liquid and the conductive outer container layer is achieved via a permanently installed conductive dip tube 16 as an electrical discharge rod and a screwed, also conductive bung plug 18, in which the dip tube is inserted, and which in the screwed-in state with the conductive outside of the barrel body is in contact (measured earth leakage resistance less than 100 kΩ at 10 V). In this case, the dip tube should touch the bottom of the drum as possible, it may be provided at the lower end preferably with a resilient accordion-like tube tip, which ensures that the dip tube extends down to the inner drum bottom in each case.

FIG. 2 a shows a bung stopper 18 made of electrically conductive plastic in which the dip tube 16 is inserted.
In Figure 2 b , the bung of the plastic barrel 10 is shown enlarged, from which it can be seen that the outer electrically conductive layer 12 of the barrel wall extends to the upper edge of the bung. Characterized - as is visible in figure 2 c - to ensure that an electrically conductive connection of the dip tube 16 the container is made at bung plug 18 screwed on to the outer layer 12th

In Figure 3a shows a metallic cap 20 (= sealing cap) is shown and Figure 3b shows a bung stopper with inserted dip tube 16, designed here as a round rod made of conductive plastic solid material, and attached Clinchring 22 (= contact ring). Figure 3 c shows the associated bung, while in Figure 3 d, the parts are all assembled. The clinch ring 22 fixes the screwed bung stopper 18 with dip tube 16 undetachable in the bung of the barrel, in which case the clinch ring 22 and the attached cap 20 make the electrical connection to the conductive outer layer 12 of the barrel.

In the embodiment of the invention shown in FIG. 4 a and FIG. 4 b , it is provided that the electrical connection between the liquid in the interior and the electrically conductive outer side 12 of the container body via a special additional, likewise conductive base screwed into the underbody of the container body. Bung plug 24 is reached (measured earth leakage resistance about 450 kΩ at 10 V).
In another embodiment - shown in Figure 5 a and Figure 5 b - it is provided that the electrical connection between the liquid in the interior and the electrically conductive outer side 12 of the container body reaches over a particular in the bottom of the container body welded plug 26 made of conductive plastic (measured earth leakage resistance less than 100 kΩ at 10 V).
In a further embodiment variant-shown in FIG. 6 a and FIG. 6 b -it is provided that the electrical connection between the liquid in the interior and the electrically conductive outer side 12 of the container body reaches via a special plug 28 of conductive plastic injected into the underbody of the container body becomes. The conductive plastic of the plug 28 is made of the same material as the outer layer 12 of the bung barrel.

According to a further embodiment variant - shown in Figure 7 a and Figure 7 b , the electrical connection between the liquid product inside and the electrically conductive outer side 12 of the container body via at least one preferably provided in the lower bottom of the container body Wandungseinformung 30 is reached, wherein the conductive plastic existing outer layer 12 is formed in the interior of the container body and comes into contact with the liquid product.
This Wandungseinformung 30 can be achieved in the blow mold by means of a special dome (= mold slide).

FIG. 8 shows a special ventilation bung plug 32 with ventilation openings 36 and with attached immersion tube 16, the ventilation of the barrel being carried out by unscrewing an inner smaller threaded plug 34. For this purpose, when emptying the barrel only the sealing cap 20 (= originality closure) to be removed while the clinch ring 22 remains on the bung or bung stopper. In Figure 9 , a particular embodiment of the dip tube 16 is shown.
The dip tube 16 and the deviating rod is formed between about 3% and 30% longer than the height of the container, such that the discharge rod extends from the conductive plug into the farthest region of the container base.

In the pallet container (IBC) 38 shown in FIG. 10 , the thin-walled plastic inner container is equipped with the features according to the invention. As further shown in Figure 11 , the electrically conductive dip tube 16 is here provided with an accordion-like tip to ensure secure contact with the underbody of the inner container.
In Figure 12 is shown as a further embodiment, a 60 liter plastic container and in Figure 13, a 20 liter plastic canister with electrically conductive outer layer.

The container body may also be formed in three layers, wherein only the outer layer is electrically conductive. The inner layer is made of normal natural-colored plastic (New material without color additives and UV stabilizers), while the middle layer of may consist of another material, such. B. Regranulat (from used Plastic containers recovered material).

The electrically conductive layers or parts are made of electrically conductive plastic material, for. As with additives such as TiO2, nano-clay, carbon black, nano-composite, metal fibers or are coated with a conductive paint.
If necessary, z. For example, if the conductive outer layer is blackened with soot, the plastic container may be provided with one or more viewing strips, the viewing strips preferably being limited in length and extending only over the vertical wall region.

The inventive measures it is ensured that the electrical connection between the contents and the container outside or the bearing surface on the ground in the worst case, for. B. in a half-empty container or a horizontal barrel, is always guaranteed permanently.
In this case, the electrically dissipative container should be as full as possible with the conductive plastic outside on the floor (ground) to get up.

Claims (7)

1. Plastic container (10) for storing and transporting especially explosive contents, comprising at least two layers of plastic, the inner layer (14) being formed such that it is electrically non-conducting and the outer layer (12) being formed such that it is electrically conducting, an electrical connection existing between the inner content and the bottom end on which the plastic container is standing, preventing an explosive electrostatic charge from building up in the container body or the content and ensuring safe discharge of any electrostatic charge into the bottom end, characterized in that the electrically conductive connection between the liquid content and the conductive outer container layer (12) is achieved by means of a permanently installed conductive discharge rod or immersion tube (16) and by means of a screwed-in, likewise conductive, bung plug (18), in which the discharge rod (16) is inserted, and which in the screwed-in state is in electrically conductive contact with the conductive outer side (12) of the barrel body, the discharge rod (16) being made longer by about between 3% and 30% than the height of the container in such a way that the discharge rod (16) reaches from the conductive bung plug (18) into the most remote region of the bottom end of the container.
2. Plastic container according to Claim 1, characterized in that the electrical connection between the liquid content inside and the electrically conductive outer side (12) of the container body is achieved by means of a special additional bottom bung plug (12), which is likewise conductive and is screwed into the bottom end of the container body.
3. Plastic container according to Claim 1 or 2, characterized in that the electrical connection between the liquid content inside and the electrically conductive outer side (12) of the container body is achieved by means of a special plug (26, 28) of conductive plastic which is welded or injection-moulded into the bottom end of the container body.
4. Plastic container according to Claim 1, 2 or 3, characterized in that the electrical connection between the liquid content inside and the electrically conductive outer side (12) of the container body is achieved by means of at least one wall indentation (30), preferably provided in the bottom end of the container body, the outer layer (12), consisting of conductive plastic, being formed such that it extends into the interior of the container body and coming into contact with the liquid content.
5. Plastic container according to Claim 1, 2, 3 or 4, characterized in that the electrically conducting bung plug (18) is formed as a ventilation bung plug (32) with ventilation openings (36) and a central smaller screw plug (34).
6. Plastic container according to Claim 1, characterized in that the bung plug (18) with inserted immersion tube (16) is undetachably fastened in the bung fitting of the plastic container by means of a clinch ring (22).
7. Plastic container according to Claim 1 or 6, characterized in that the bung plug (18) with inserted immersion tube (16) is formed as a ventilation bung plug (32) with ventilation openings (36) and a screwed-in smaller screw plug (34).

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