DE202006020793U1 - pallet container - Google Patents

Abstract

Pallet container (10) for the storage and transport of liquid or flowable products, with a thin-walled rigid inner container (12) made of thermoplastic material, with a plastic container (12) as a support jacket tightly enclosing tubular frame (14) and with a bottom pallet (16) on which the plastic container (12) rests and with which the grid tube frame (14) is firmly connected, wherein the plastic inner container (12) laterally below in a recessed recess (18) of the side wall arranged protected with a blown pipe (20) for Attachment of a removal fitting for the liquid product is provided, characterized in that the connecting piece (20) with a sealing cover made of an electrically conductive material (22) is firmly closed, and the closure lid (22) with a connection (24) for an electrical Cable is fitted with the grid frame (14) or / and the Bodenpa lette (16) is connectable.

Description

The The invention relates to a pallet container for storage and the transport of liquid or flowable Filled goods, with a thin-walled rigid Inner container made of thermoplastic material, with a the plastic container as a support jacket tightly enclosing Grid frame and with a bottom pallet on which the plastic container rests and with which the support shell is firmly connected, the plastic inner container laterally below in a protected recessed recess of the side wall arranged with a blown-on socket for mounting a removal fitting is provided for the liquid contents.

State of the art:

The general construction of such pallet containers with its essential components is z. B. from the publication DE 103 13 481 A1 (= US 020040218336 A1 ) known. The removal fitting for removing the liquid filling material is screwed by means of union nut firmly on the provided with an external thread outlet nozzle of the inner container, which is arranged laterally protected below in a recessed recess of the inner container side wall. In a nozzle with frontside flange the removal fitting z. B. fastened by means of over-tightening clamp.

Should Such a pallet container for flammable or explosive Liquids are used, so must on the one hand an electrical charge of the outer surface the plastic container and on the other hand an electrical Charging the inner surface of the plastic container and / or the contents themselves be prevented. this happens Known by the fact that the plastic inner container consists of several layers, the outer one Layer electrically conductive or antistatic, d. H. not chargeable is trained. In a similar way, an electrical connection made to the inner contents, so that electrical Charges from inside the plastic container or / and of the contents are discharged directly to the outside can. There are already various solutions for this.

In the from the DE 103 13 481 A1 This known pallet container, this is done in that the outer cylindrical end of the externally threaded outlet nozzle, which is integrally blow molded with the inner container body and having an electrically conductive outer layer, is retracted to an inner ring with an annular, electrically conductive inner layer, with the liquid filling material for electrical grounding of the filling space of the inner container is in contact.

From the publication DE 102 42 956 A1 (= US 020040089659 A1 Further, a pallet container with a multilayer, in the permanent antistatic outer layer with Leitrußanteil black inked inner container is known, the integrated to form the inner filling material in the body of the plastic inner container four, designed as strips, electrically conductive portions of a high density polyethylene with a Has Leitrußanteil. The electrically conductive strips are in contact with the liquid contents on the inside of the container and form an electrical connection or grounding of the container interior via the underpan made of sheet metal of the bottom pallet. The disadvantage here is the high mechanical complexity of the blow molding machine with additional extruders and an extrusion head with four-fold Sichtstreifeneinrichtung for the usually made of colorless plastic material translucent "sight strip". In the publication WO 2003/093116 A2 It has also been proposed to introduce plugs made of electrically conductive plastic in the underbody of plastic containers. However, this requires the formation of the additional bung opening a corresponding glass mandrel or thread expanding mandrel in the blow mold and is technically complicated to manufacture.

It Object of the invention to provide a pallet container, the with a given plastic inner container with a laterally below in a recessed recess of Sidewall protected arranged blown pipe with External thread or front flange ring for mounting a removal fitting is equipped, and for a Use of dangerous and easily flammable Filling goods is thus particularly well suited, on the one hand, an electrical connection to the inner Filled product is made so that electrical charges the inner surface of the plastic container and / or the contents of the product even directly to the outside can be derived and sparks are prevented, and at the same time a high level of security against unintentional leakage of the explosive filling material.

This object is achieved by simple structural means in that the laterally protected below the recessed recess of the side wall arranged stub with a closure made of an electrically conductive material cap is firmly closed, and the closure cap is equipped with a connection for an electric cable, the is connected to the lattice frame or / and the bottom pallet. The contents are constantly inside with the electrically conductive cap in contact, so that electrical Charges z. B. caused by back and forth sloshing filling with friction on the inner surface of the plastic inner container, via the cap with connected electrical cable, which is connected to the lattice frame or / and the bottom pallet, are derived with certainty. Advantageously, a sump is formed directly in front of the neck of the inner container as the lowest point in the bottom of the inner container, so as to ensure that until the removal of the entire contents, for example by pumping up through the upper filling and emptying opening, always the last part the residual liquid is in electrically conductive contact with the closure cap.

The Particularity of the present invention results from the fact that a Manufacturers of pallet containers given the opportunity becomes, with a single tuyere different inner container for different applications. On the one hand, normal pallet containers can be produced which are a normal removal fitting on the external thread screwed on the neck or by means of clamp on the front Flange ring is attached. On the other hand, pallet containers be prepared for use of dangerous and flammable products are, for example, a special removal fitting of electrical conductive plastic on the external thread of the nozzle is screwed on. It is assumed that the surface the plastic inner container either electrically conductive or antistatic, d. H. is not designed to be rechargeable. about the electrically conductive removal fitting and a thereto and on the Grid pipe connected ground wire is then an electrical Connected to the inner contents, so that electrical Charges from the interior of the plastic container or of the contents are discharged to the outside.

A Increased security against unwanted leakage of flammable contents are in a pallet container with Plastic inner container with blown pipe but achieved only when the neck unsolvable tightly closed is and the contents through the upper filling and Removal opening is removed or pumped. As is known, is a frequently operated removal fitting (continuous changing lever loads) with their seals the most sensitive Part of a pallet container and 95% of all leaks are caused by defective removal fittings. With the invention Execution of an electrically conductive closure lid on the blown neck is also an execution of a Pallet container for flammable liquids given that ensures maximum leakage safety. There are no changes and modifications to the Blow molding machine required. Of course you could also from the beginning inner container without recess (Spundmulde) and without blown nozzles, only would have to be made then kept a different blow mold in stock and installed. Also conversions by exchangeable inserts at one and the same blow mold are known; however needed also a conversion corresponding downtime of the blow molding machine and some downtime in continuous production.

With According to the present invention, it is the manufacturer of pallet containers So readily possible, with production running Blow molding machine between at least three different designs to switch from pallet containers, all to a plastic inner container have blown neck, without a time break to accept the production and without even a single piece of reject to produce. Prerequisite for this is however, that the blow molding machine at least two or has more extruder and the plastic inner container produced consists of at least two or more layers. When changing from quite "normal" inner containers to inner containers with electrically dissipative or antistatic, non-chargeable Surface is only the extruder for the outer layer fed plastic granules of "normal" plastic material converted to anti-static compounder plastic material. It It takes a while, then, until the compounder plastic material the normal plastic material from the extruder and the peripheral distributor expressed and displaced, until only pure Compounder plastic material is pressed out of the extrusion die, because the antistatic compounder plastic material but colorless is, all the inner container can not yet sufficient, or not evenly distributed antistatic compounder plastic material outer layer sold as a completely "normal" inner container and there are no production losses.

In a simple and inexpensive variant the invention is for a plastic inner container provided with blown neck with external thread that the Cap designed as a normal screw cap with internal thread is that with an inserted seal on the external thread of the nozzle is screwed on and connected to the electrical cable is connected to the grid frame. The closure lid can be made of metal, z. B. die-cast aluminum or from a be made of electrically conductive plastic material, so that for an electrical connection to the inner Contents is taken care of.

In another embodiment of the invention, it is provided that on the external thread de the nozzle or / and on the internal thread of the screw cap, an adhesive is applied and screwed the screw cap with or without inlaid seal on the external thread of the nozzle and liquid-tight non-detachably firmly adhered. This ensures that the screw can not solve in an unintentional manner; also a failure of the seal z. B. by decreasing sealing effect is excluded.

In a further advantageous embodiment of the invention is provided that the screw cap from a central Cover part and an outer union nut consists, wherein the central cover part with the connection for the electrical cable made of an electrically conductive Plastic material is made. This variant is special suitable for such products, which are not should definitely come into contact with metal.

In The preferred embodiment of the invention is finally provided that the closure lid with the connection for the electrical cable from a total of one by injection molding manufactured blind plugs made of electrically conductive plastic material The insoluble firmly on the blown neck the plastic inner container is welded. The nozzle can be an external thread or a front side Flange ring have. This version is the highest safety for a tight container (no unwanted Leaks at the discharge nozzle) and permanent discharge capacity ensures the inner filling material; this too especially when the welded blind plug very short built and almost not over the outside the nozzle of the plastic inner container protrudes.

The Invention will be described schematically with reference to the drawings illustrated embodiments explained in more detail and described. Show it :

1 a pallet container according to the invention in front view,

2 a plastic inner container in perspective view,

3 the blown neck of the plastic inner container,

4 an embodiment of a closed neck,

5 another embodiment of a closed neck and

6 the preferred embodiment of a sealed nozzle.

In 1 is an inventive pallet container with the reference numeral 10 referred to, consisting of a plastic inner container 12 , one the plastic inner container 12 tightly enclosing lattice tube frame 14 and a floor pallet 16 consists. To this pallet container 10 for use with flammable liquids or explosive contents such as: As solvents for paints, to make particularly suitable, is the lower nozzle 20 of the inner container 12 with a special electrically conductive cap 22 provided with a connected electrical cable 44 with the lattice tube frame 14 is in electrically conductive connection. About this simple design variant, the liquid product is always grounded especially at the critical moments of Füllguteinfüllung and Füllgutentnahme so that electrical charges are dissipated and a spark or explosion hazard is prevented with certainty.

The plastic inner container 12 is in 2 shown as a single item; in the topsoil is a central filling and removal opening 40 arranged and in the front side wall is a level measuring scale 42 imprinted. It can be seen that the blown neck 20 at the bottom in a recessed depression 18 the front side wall is arranged protected. The plastic inner container with a wall thickness of approx. 3 mm is produced by coextrusion and consists of three layers. The inner layer consists of natural high-molecular-weight HDPE (High Density Poly Ethylene), the middle layer consists mostly of regranulate and the thin outer layer of approx. 0.2 mm consists of a special plastic material (LDPE (Low Density Poly Ethylene with Compounder Additives) create an antistatic effect on the surface of the plastic inner container and prevent electrical charging 3 is the neck 20 of the inner container 12 Enlarged in partial section view. The stub 20 is provided with external thread for mounting a removal fitting for the liquid product and has a length of about 35 mm. Advantageously, a sump is formed directly in front of the neck of the inner container as the lowest point in the bottom of the inner container, so as to ensure that until the removal of the entire contents, for example by pumping up through the upper filling and emptying opening, always the last part the residual liquid is in electrical contact with the inextricably fixed patch cap.

In 4 . 5 and 6 different embodiments of the electrically conductive cap are shown.

It shows 4 a screwed tight th closure cap in the embodiment of a one-piece threaded screw cap 26 with inserted seal 28 , The outer flange ring of the screw cap 26 is provided with an internal thread on the external thread of the nozzle 20 is screwed on. Central is a cable connection 24 for fixing a grounding cable (not shown) 44 ( 1 ) disposed on the other side with the metal grid frame or an electrically conductive floor pallet in combination.

Another embodiment of a tightly screwed cap, consisting of a two-piece threaded screw cap with outer nut 32 with internal thread, seal 28 and central lid part 30 is in 5 shown. Here is the cover part 30 the cable connection 24 for fixing the grounding cable.

The union nut 32 consists of die-cast aluminum or an electrically conductive plastic material; the ground wire 44 could also be directly on the union nut 32 be attached. In a modified embodiment, the screw cap 26 be screwed without an inserted seal on the external thread of the nozzle and gas-tight and liquid-tight permanently bonded firmly. This is the external thread of the nozzle 20 or / and the internal thread of the screw cap 26 or the union nut 32 coated with a thick-flowing sealing adhesive. This ensures that the screw could solve in an unintentional manner; also a failure of the seal z. B. by decreasing sealing effect is excluded.

The preferred embodiment is in 6 shown. Here is a blind plug 34 by means of welded connection 46 indissolubly fixed frontally on the neck 20 welded. The blind plug 34 is at the inner diameter of the neck 20 adapted to the plastic inner container and has a trained as an insertion tube tubular nozzle part 36 and an outer flange ring 38 on, with which of the blind plugs 34 against the front of the neck 20 is welded. In this case, which is designed as an insertion tube tubular nozzle part 36 the dummy plug 34 up to the outer flange ring 38 by a length of about 20 mm to 40 mm, preferably about 30 mm, in the nozzle 20 of the plastic inner container 12 plugged in; the length of the dummy plug 34 itself is only about half of its largest outer diameter on the outer flange ring 38 , so that the cable connection 24 not or only slightly above the flange ring 38 survives. As a result, the blind plug is optimally protected in case of container crashes or fall test.

The connection when welding blind plugs 34 and neck 20 takes place in a separate operation under controlled joining conditions such. B., joining time, joining temperature and joining pressure, etc. When welding z. B. after the mirror welding process, a tool for fixing the outlet nozzle engages in its external thread, so that a high mechanical joining pressure during welding of the blanking plug 34 can be applied. In a similar way, the blind plug 34 permanently sealed to the nozzle with gas and liquid tight.

Across from by means of union nut or clamp on the outlet nozzle the inner container attached outlet fittings connections has a non-detachable tight and sealed nozzle the advantage of a higher security against leakage or Leaks. Furthermore, a sealed neck is significant more cost-effective, because on each pallet container required outlet fitting, union nut or clamp and ring seal can be dispensed with. A pump lance, by means of which such a pallet container is emptied, is anyway available at every pumping station.

These so designed inner container with universal blown calibrated outlet nozzle (with screw thread or front flange ring) can thus be screwed on or welded on Outlet fittings or even for tightly closed Outlets without outlet fitting are used. This results the following advantage: welded-on outlet fittings or welded blind plugs can at a Reconditioning by simple mechanical separation of firmly together connected components outlet tap or blind plug and outlet spigot removed and very easy for further use a screw-on valve with seal and union nut or clamp to be replaced, as it is in the usual used Pallet containers is practiced.

The Welded joint is preferably in the mirror welding process generated. But other welding methods such as laser welding, the Friction welding, ultrasonic welding or the Vibration welding could be used.

10

pallet container

12

Plastic inner container

14

Spaceframe

16

bottom pallet

18

recessed deepening

20

Support ( 12 )

22

cap

24

cable connection

26

screw cap

28

poetry

30

central cover part

32

Nut

34

blind plug

36

Neck part ( 34 )

38

Flange ring ( 34 )

40

Filling / emptying opening

42

level scale

44

ground wire

46

welded joint

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10313481 A1 [0002, 0004]
• - US 020040218336 A1 [0002]
• - DE 10242956 A1 [0005]
• - US 020040089659 A1 [0005]
• WO 2003/093116 A2 [0005]

Claims (9)

Pallet container ( 10 ) for the storage and transport of liquid or free-flowing products, with a thin-walled rigid inner container ( 12 ) made of thermoplastic material, with a plastic container ( 12 ) as a supporting jacket tightly enclosing lattice tube frame ( 14 ) and with a floor pallet ( 16 ), on which the plastic container ( 12 ) and with which of the space frame ( 14 ), wherein the plastic inner container ( 12 ) laterally down in a recessed recess ( 18 ) of the side wall arranged protected with a blown neck ( 20 ) is provided for mounting a removal fitting for the liquid product, characterized in that the neck ( 20 ) with a sealing cover made of an electrically conductive material ( 22 ) is tightly closed, and the closure lid ( 22 ) with a connection ( 24 ) is equipped for an electrical cable that is connected to the space frame ( 14 ) and / or the floor pallet ( 16 ) is connectable. Pallet container according to claim 1, characterized in that the closure lid ( 22 ) as a screw cap ( 26 ) is formed with an internal thread, with an inserted seal ( 28 ) on the externally threaded socket ( 20 ) is screwed on. Pallet container according to claim 1 or 2, characterized in that on the external thread of the nozzle ( 20 ) and / or on the internal thread of the screw cap ( 26 ) an adhesive is applied and the screw cap ( 26 ) with or without an inserted seal on the external thread of the nozzle ( 20 ) is screwed on and permanently glued firmly. Pallet container according to claim 1, 2 or 3, characterized in that the screw cap consists of a central cover part ( 30 ) and an outer union nut ( 32 ), wherein the central cover part ( 30 ) with the connection ( 24 ) is made for the electrical cable made of an electrically conductive plastic material. Pallet container according to claim 1, characterized in that the closure lid ( 22 ) with the connection ( 24 ) for the electrical cable from an injection-molded blind plug ( 34 ) consists of electrically conductive plastic material, which by means of welded connection ( 46 ) inseparably fixed with the blown neck ( 20 ) of the plastic inner container ( 12 ) is welded. Pallet container according to claim 5, characterized in that the blind plug ( 34 ) to the inner diameter of the nozzle ( 20 ) of the plastic inner container ( 12 ) adapted, designed as an insertion tube tubular socket part ( 36 ) and an outer flange ring ( 38 ), with which the blind plug ( 34 ) against the front side of the nozzle ( 20 ) is welded. Pallet container according to claim 5, characterized in that the blind plug ( 34 ) to the inner diameter of the nozzle ( 20 ) of the plastic inner container ( 12 ) adapted, designed as an insertion tube tubular socket part ( 36 ) and with which of the blind plugs ( 34 ) gas and liquid-tight with the neck ( 20 ) is glued. Pallet container according to claim 5 or 6, characterized in that the tubular neck part ( 36 ) of the dummy plug ( 34 ) to the welded outer flange ring ( 38 ) by a length of about 20 mm to 40 mm, preferably about 30 mm, in the neck ( 20 ) of the plastic inner container ( 12 ) is inserted. Pallet container according to claim 5, 6, 7 or 8, characterized in that the length of the blanking plug ( 34 ) itself only about half of its largest outer diameter on the outer flange ring ( 38 ) is.