EP2896575A1 - Combination barrel made of two plastic barrels - Google Patents

Abstract

The invention relates to a combination drum (10, 100, 200) comprising an outer drum (14) and an inner drum (12), wherein the outer drum (14) has a first drum part (20, 102, 202) and a second drum part (22, 104, 204). The two grip parts (20, 22, 102, 202, 104, 202, 204) are firmly connected to one another in a connection region. The inner barrel (12) and the outer barrel (14) are made of a plastic. Furthermore, the invention relates to a method for producing such a combination keg (10, 100, 200).

Description

The invention relates to a combination drum comprising an outer drum and an inner drum accommodated in the outer drum. The body of the outer barrel is formed from a first and a second Fassteil, wherein the first Fassteil has a first connection portion and the second Fassteil a complementary to the first connection region formed second connection region. Furthermore, the invention relates to a method for producing such combination kegs.

Known combination kegs consist of an outer drum made of sheet steel and an inner drum made of plastic. The inner drums can not be made of steel, as combination drums are often used to transport and store aggressive chemicals and steel is not resistant enough to such aggressive chemicals.

Furthermore, combination drums are also used for chemicals with a low vapor pressure. If barrels were used for this purpose from only one container, they would be deformed on cooling of the chemicals due to the decreasing vapor pressure and thus resulting negative pressure. This has the consequence that the barrels, if they are stacked, for example, can fall down or can not be handled. Furthermore, such simple barrels can implode in this case in the empty state. On the other hand, the use of combination drums has the advantage that at least the outer container, ie the outer drum, does not deform and thus the shape remains stable.

However, there are applications in which the use of metallic drums has disadvantages. Therefore, combination kegs can be made from a metal outer keg and a plastic barrel are not used or only at the cost of certain disadvantages.

Combination kegs, in order to be approved for the transport and storage of dangerous goods, must comply with UN directives, i. There are numerous extensive approval tests must be passed.

It is an object of the invention to provide a particularly simple and easy constructed combination drum. It is another object of the invention to provide a method for producing such a combination drum.

The object is achieved by a combination drum with the features of claim 1 and by a method having the features of the independent method claim. Advantageous developments of the invention are specified in the dependent claims.

According to the invention, the combination drum consists of an outer drum and an inner drum accommodated in the outer drum, wherein the body of the outer drum is formed by a first and a second drum part, which are connected to one another by way of two complementary connection areas. In an assembled condition, i. in the state in which the combination keg is finished assembled, the first and the second Fassteil are firmly connected. Both the inner and the outer barrel are made of a plastic.

This ensures that can be dispensed with metal, especially steel sheets, and the combination drum is constructed entirely of plastic. As a result, the combination drum can also be used in areas where Metallic materials are undesirable. Nevertheless, the desired security is achieved and the UN guidelines can be met. In addition, the use of plastic has the advantage that the barrel is much lighter and thus easier to handle.

It is advantageous if the first and the second Fasteils are welded together at the connection area. This ensures that a secure attachment of the two parts of the outer barrel is achieved after the introduction of the inner barrel and yet an economical production is possible. In addition, by using a welding method for joining the two parts, it is possible to achieve that the geometry of the outer barrel, in particular the outer geometry, is not influenced and thus that for the fulfillment of security inspection requirements, e.g. Internal pressure test, cold drop test, established requirements are met. In particular, it is thus possible that the combination drum in its outer shape compared to standard plastic drums does not have to be changed and thus its behavior is not affected in the individual test steps.

The weld is in particular designed such that it does not change the outer contour of the outer barrel, so that always the same barrel shape can be guaranteed.

In particular, the use of welding methods makes it possible for the attachment of the two barrel parts of the outer barrel to be reproducible and thus to ensure that the desired properties are achieved. For this purpose, the welding is carried out in particular via a fusion welding process, in which preferably a melting mirror is used for connecting the barrel parts.

Furthermore, it is advantageous if the first and the second connection region are conical, so that their connection takes place via an inner surface which does not influence the geometry of the drum. In addition, the largest possible and thus safer connection area can be achieved via the conical forming.

The inner barrel and the outer barrel are preferably each made in a blow molding process, so that a simple, safe and yet accurate production is possible.

Further, it is advantageous if the first and second Fas part of the outer barrel are made of the same plastic, so that it is ensured during welding that these plastics optimally connect with each other. Furthermore, the inner drum can be made of the same plastic. Alternatively, the inner and outer drum can be made of different plastics, in particular, the inner drum can be adapted to the male chemicals.

In a preferred embodiment of the invention, the first Fassteil forms the bottom and the side wall of the outer barrel, whereas the second Fassteil the outer barrel forms the lid of the outer barrel. Alternatively, the first Fas part also form the lid and the side wall and the second Fassteil exclusively the ground. This ensures that the connection point is automatically arranged in the already provided conical areas at the ends of the barrel.

The inner contour of the outer barrel and the outer contour of the inner barrel are in particular matched to one another and formed substantially the same, so that the inner barrel fits optimally on the outer barrel and, if possible, can not slip. Furthermore, this makes optimum use of the available volume.

Furthermore, it is advantageous if the drum lid of the outer drum is designed in such a way that it has a channel and if a drain opening is provided from which liquid collecting in the drain can drain. This drain opening is designed such that it passes through the welded area, that is to say through the two connection areas.

Furthermore, it is advantageous if the combination drum has at least one ventilation valve, which is preferably arranged in the region of the lid and extends through the outer drum.

Another aspect of the invention relates to a method for producing a combination keg, in which an inner drum is made of plastic. Further, a first Fas portion of an outer barrel and a second Fassteil the outer barrel is made of a plastic, wherein the first Fas part is made such that it is made a first connection portion and the second Fassteil such that it has a second connection region to the first connection region complementary. The inner drum is inserted through an opening of the first barrel part in this. Subsequently, the first opening of the first barrel portion is closed with the second Fassteil, wherein the second Fassteil this is placed accordingly and the two Faßtile are firmly connected to each other in the connecting areas.

The two barrel parts of the outer barrel are in particular welded together, which has the advantage that a simple economic method for connecting the two barrel parts is achieved, but still a reproducible secure connection between the two barrel parts takes place.

In particular, a fusion welding process is used to weld the two structural parts, which can be carried out in particular with the aid of a welding mirror. This has the advantage that the welding process can be carried out very accurately and reproducibly and in particular is not influenced by the connection of the two parts, not the outer shape of the outer barrel. This ensures that the form required for handling and compliance with security policies is maintained.

In one possible method, the welding mirror is first arranged at the connecting region of the first barrel part. The inner drum is introduced into the first barrel portion of the outer barrel only when the melting time of the melting mirror has passed, that is, when the melting point of the melting pot has passed. when the melting mirror has already melted in the connecting region, the material of the first barrel portion. Subsequently, the second Fassteil is placed.

In an alternative method, the inner barrel may first be inserted into the first barrel portion and then commenced the welding process, i. that only then the melting mirror is placed on the first connection area and is started with the melting of the material.

Furthermore, it is alternatively also possible that the melting takes place simultaneously with the aid of the melting mirror and the insertion of the inner barrel into the first Fas portion of the outer barrel. As a result, a particularly fast manufacturing process is achieved.

Furthermore, it is advantageous if the inner barrel and the outer barrel are each produced by the blow molding process. In a particularly preferred embodiment, the first and second barrel portions of the outer barrel are combined in a single operation of a blow molding process from a melt tube as a workpiece made, which is then separated into the two parts. Specifically, in this blow molding method, the workpiece is first formed such that the second fitting part is disposed "upside down", ie, rotated by 180 °, as compared with the position where it is finally welded to the first fitting part. After separating the two barrel parts, the second Fassteil is rotated by 180 ° and welded in its intended orientation to the first Fassteil.

Furthermore, it is advantageous if at least the inner and / or outer surface of the first and / or second gripping part are made of an electrically conductive plastic. In particular, the entire first and / or second Fassteil can be made of an electrically conductive plastic. Alternatively, only an electrically conductive coating can also be provided here.

The method described above can be further developed with the features or corresponding method features specified in the claims dependent on the independent device claim. Conversely, the device indicated by the independent apparatus claim may be further formed by the features set forth in the method claims and corresponding apparatus features, respectively.

Further features and advantages of the invention will become apparent from the following description. The invention will be explained in more detail by means of exemplary embodiments in conjunction with the attached figures.

Figur 1

Eine schematische, perspektivische Darstellung eines Kombinationsfasses gemäß einer ersten Ausführungsform;

Figur 2

eine Schnittdarstellung des Kombinationsfasses nach Figur 1;

Figur 3

einen vergrößerten Ausschnitt der Schnittdarstellung nach Figur 2;

Figur 4

einen weiteren vergrößerten Ausschnitt der Schnittdarstellung nach Figur 2;

Figur 5

eine Schnittdarstellung eines Außenfasses des Kombinationsfasses nach Figur 1 nach der Beendigung eines Blasformverfahrens;

Figur 6

eine schematische, perspektivische Darstellung des Außenfasses nach Figur 5 mit abgetrenntem Deckel;

Figur 7

eine Explosionsdarstellung des Außenfasses nach den Figuren 5 und 6 während eines Schmelzschweißvorgangs;

Figur 8

eine teilgeschnittene Darstellung eines Kombinationsfasses gemäß einer zweiten Ausführungsform;

Figur 9

einen Ausschnitt einer Schnittdarstellung des Kombinationsfasses nach Figur 8 während des Schweißvorgangs;

Figur 10

eine weiteren Ausschnitt des Kombinationsfasses nach Figur 8 vor dem Zusammenfügen der beiden Fassteile des Außenfasses; und

Figur 11

eine teilgeschnittene Darstellung eines Kombinationsfasses gemäß einer dritten Ausführungsform.

Show it:

FIG. 1

A schematic perspective view of a combination keg according to a first embodiment;

FIG. 2

a sectional view of the combination keg after FIG. 1 ;

FIG. 3

an enlarged section of the sectional view after FIG. 2 ;

FIG. 4

a further enlarged section of the sectional view of Figure 2;

FIG. 5

a sectional view of an outer barrel of the combination barrel after FIG. 1 after the completion of a blow molding process;

FIG. 6

a schematic perspective view of the outer barrel according to FIG. 5 with separate lid;

FIG. 7

an exploded view of the outer barrel after the Figures 5 and 6 during a fusion welding operation;

FIG. 8

a partially sectioned view of a combination keg according to a second embodiment;

FIG. 9

a section of a sectional view of the combination keg after FIG. 8 during the welding process;

FIG. 10

another section of the combination keg after FIG. 8 before joining the two parts of the outer barrel; and

FIG. 11

a partially sectioned view of a combination keg according to a third embodiment.

In FIG. 1 is a schematic perspective view of a combination drum 10 is shown. FIG. 2 shows a sectional view of the combination keg after FIG. 1 . FIG. 3 and 4 in each case a section of this sectional view FIG. 2 ,

The combination drum 10, which is often also referred to as a combined drum, comprises an inner drum 12, which is also referred to as an inliner, and an outer drum 14. The inner drum 12 is in this case received in the outer drum 14, wherein the shapes of the inner drum 12 and the outer drum 14 are coordinated. In particular, the outer contour of the inner barrel 12 is substantially identical to the inner contour of the outer barrel 14, so that they fit optimally into one another and no space is given away. The outer surface 16 of the outer barrel and / or the inner surface 18 of the inner barrel can in particular be made of an electrically conductive plastic. Alternatively, the entire outer barrel 14 can be made of an electrically conductive plastic.

Both the inner barrel 12 and the outer barrel 14 are in particular made of plastic in a blow molding process, so that a simple inexpensive and yet precise production is possible.

The outer barrel 14 consists of a first Fassteil 20, in which in the FIGS. 1 to 7 illustrated first embodiment forms the bottom or the side wall of the barrel, and a second Fassteil 22, which forms the lid of the outer barrel 14 in the first embodiment. In the area of this cover 22, a ventilation valve 24 and filling openings 26, 28 are provided, which pass through the outer drum 14 therethrough.

Further, the lid 22 is preferably formed such that a groove 30 is formed in it. In the wall of the outer barrel 14, a drain opening 32 is provided, which passes through both the first Fassteil 20 and the second Fassteil 22, so the lid. About this drain opening 32 can drain liquid collected in the channel 30.

Both the inner barrel 12 and the outer barrel 14 are made of a plastic by means of blow molding. Here, as in FIG. 5 shown, first made in a single operation from a single melt tube, the outer barrel 14, wherein the first Fassteil 20 and the second Fassteil 22 are formed contiguous. Subsequently, as in FIG. 6 shown, the second Fassteil 22, so the lid, separated from the first Fassteil 20.

For assembly of the combination drum 10, the second Fassteil 22 is compared with the state where it is attached to the blow molding on the first Fassteil 20, rotated by 180 ° and, after the inner barrel 12 through the opening 34 of the first barrel portion 20 in the first Fassteil 20 of the outer barrel 14 has been used, permanently and firmly welded to the first Fassteil 20.

As in FIG. 7 shown, the welding of the two parts of the outer barrel 14 takes place by means of a fusion welding process carried out via a welding mirror 36. For this purpose, outer surface 38 of the welding mirror 36 corresponding to the connecting region 40 of the first barrel part 20 and the inner side 42 corresponding to the connecting region 44 of the second barrel part 22 are formed. The material is melted in the area of the connecting regions 40, 44 via the melting mirror 36, so that the two clamping parts 20, 22 can be connected to one another permanently, safely and without the formation of an outwardly directed weld seam.

This ensures that the outer shape is reproducible and the combination drum 10 meets all requirements of safety guidelines. Thus, a combination drum 10 can be produced in a simple and efficient manner, which consists exclusively of plastic and yet meets the high safety requirements for the transport of dangerous goods.

The connection of the two barrel parts 20, 22 of the outer barrel 14 takes place only after the inner barrel 12 has been introduced. Here, first, the inner barrel 12 can be inserted into the first Fassteil 20 before the welding process is started. Alternatively, first of all, the welding mirror 36 can be placed on the connecting region 40 and the inner barrel 12 can be inserted only after completion of the melting, but of course before joining the two barrel parts 20, 22.

By manufacturing both components 20, 22 in a single blow molding process on the one hand, a fast, inexpensive and effective production is achieved. Furthermore, this ensures that the two parts are formed from the same plastic and thus can be optimally welded together, which further increases safety.

In the FIGS. 8 to 10 a combination drum 100 according to a second embodiment of the invention is shown. In this second embodiment of the invention, the first fascia 102 includes the lid and side wall of the outer barrel 14 and the second fascia 104 only the bottom. Accordingly, the welded connection is arranged at the lower end of the drum 10.

In FIG. 9 Here, it is shown how, in this embodiment, the welding mirror 106 is arranged between the two fitting parts 102, 104 in order to melt the connecting regions 40, 44. In FIG. 10 the state is shown after the melting mirror 106 has been removed, so that the two parts 102, 104 can be connected to each other according to the arrow P1.

FIG. 11 shows a partially sectioned view of a combination keg 200 according to a third embodiment of the invention. In this embodiment, as in the first embodiment, the first chamfer 202 includes the bottom and the side wall of the outer barrel 14. The second chamfer 204 is again formed in the shape of the lid, however, the lid 204 in this embodiment becomes different from the first embodiment , put on the first Fasteil 202 from the outside.

In all three embodiments, the welding takes place in each case in a conical region of the outer barrel 14. Correspondingly, the connecting regions 40, 44, via which the two fitting parts 20, 22, 102, 104, 202, 204 are connected to one another, are likewise conical. This has the advantage that the largest possible welding surface is formed and, in particular, no weld seam which influences the outer contour is produced. Alternatively, the connecting portions 40, 44 may also have a shape deviating from the conical shape.

LIST OF REFERENCE NUMBERS

10, 100, 200

combination barrel

12

inside barrel

14

outer barrel

16

outer surface

18

inner surface

20, 102, 202

first Fasteil

22, 104, 204

second Fassteil

24

vent valve

26, 28

opening

30

gutter

32

drain hole

34

opening

36, 106

welding mirror

38, 42

surface

40, 44

connecting area

P1

direction

Claims (15)

Combination barrel,
with an outer barrel (14), and
with an inner barrel (12) accommodated in the outer barrel (14),
wherein the body of the outer barrel (14) is formed of a first Fassteil (20, 102, 202) and a second Fassteil (22, 104, 204),
the first fascia part (20, 102, 202) has a first connection region (40) and the second fascial part (22, 104, 204) has a second connection region (44) which is complementary to the first connection region (40),
the first and second fascia members (20, 22, 102, 104, 202, 204) are fixedly connected to each other via the connection portions (40, 44) in an assembled state, and
wherein both the inner barrel (12) and the outer barrel (14) are made of plastic. Combination drum (10, 100, 200) according to claim 1, characterized in that the first and the second Fassteil (20, 22, 102, 104, 202, 204) at the connecting portions (40, 44) are welded together. Combination drum (10, 100, 200) according to claim 2, characterized in that the weld seam is formed such that it does not change the outer contour of the outer drum (14). Combination drum (10, 100, 200) according to one of the preceding claims, characterized in that the first and the second connection region (40, 44) are conical. Combination keg (10, 100, 200) according to any one of the preceding claims, characterized in that the first chamfer (20, 102, 202) forms the bottom and the side wall of the outer keg (14) and in that the two chamfer part (22, 104, 204 ) forms the lid of the outer barrel (14). Combination drum (10, 100, 200) according to one of claims 1 to 4, characterized in that the first Fassteil (20, 102, 202) the lid and the side wall of the outer barrel (14) and that the two Fassteil (22, 104 , 204) forms the bottom of the outer barrel (14). Method for producing a combination drum,
in which an inner barrel (12) is made of plastic,
a first Fassteil (20, 102, 202) of an outer barrel (14) having a first connection region (40) and a second Fassteil (22, 104, 204) of the outer barrel (14) with a first connection region (40) complementary second connection region ( 44) are made of plastic,
the inner barrel (12) is inserted into the first barrel part (20, 102, 202) via an opening (34) thereof,
and in which subsequently the opening (34) of the first barrel part (20, 102, 202) is closed with the second barrel part (22, 104, 204) and the two grip parts (20, 22, 102, 104, 202, 204) over the connection areas (40, 44) are firmly connected to each other. A method according to claim 7, characterized in that the two barrel parts (20, 22, 102, 104, 202, 204) of the outer barrel (14) are welded together. A method according to claim 8, characterized in that the two fitting parts (20, 22, 102, 104, 202, 204) are welded together by a fusion welding process. A method according to claim 8 or 9, characterized in that the welding by means of a welding mirror (36, 106). A method according to claim 10, characterized in that the welding mirror (36, 106) on the first connecting portion (40) of the first barrel portion (20, 102, 202) is arranged, and that the inner barrel (12) in the first Fassteil (20, 102, 202) is introduced after the melting time of the melting mirror (36, 106) and before the placement of the second barrel part (22, 102, 104). A method according to claim 10, characterized in that the insertion of the inner barrel (12) in the first Fassteil (20, 102, 202) and the arranging of the Melting mirror (36, 106) at the first connection region (40) takes place simultaneously. Method according to one of claims 7 to 12, characterized in that the inner barrel (12) and the outer barrel (14) are each produced by the blow molding process. A method according to claim 13, characterized in that the first and the second Fassteil (20, 22, 102, 104, 202, 204) of the outer barrel (14) are produced in a single blow molding process as a workpiece, which then in the two parts ( 20, 22, 102, 104, 202, 204) is separated. A method according to claim 14, characterized in that the second Fassteil (22, 104, 204) is rotated after separation by 180 ° and in this rotated orientation again to the first Fassteil (20, 102, 202) is welded.

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