DE102012006735A1 - Thermoplastic lid for liquid-tight plastic containers e.g. inner container of pallet container, has seal portion that is axially connected to outer edge of rotationally symmetrical horizontal seal retaining edge in lid portion - Google Patents

Abstract

The thermoplastic lid has seal portion (18) that is pressed against the sealing surface (15) of the opening edge (14) of the container portion (12). A U-shaped clamping ring (11) is provided onto the container portion. A cladding flange (13) is placed in spacing below the barrel top and the sealing surface, at clamping ring. The cladding flange is engaged with the opening edge or outer edge (22) via a thread portion. The seal portion is axially connected to the outer edge of rotationally symmetrical horizontal seal retaining edge (34) in the lid portion.

Description

The invention relates to plastic lids made of thermoplastic material for liquid-tight plastic containers (lidded container or inner container of pallet containers) for the transport and storage of liquids in which the plastic lid is held by a U-shaped clamping ring or a thread on the plastic container, the gas-tight and liquid-tight seal in the closed state takes place via an annular seal which seals against the sealing surface of the mouth of the container opening and is biased by additional sealing holding parts in the plastic lid.

State of the art

The invention is basically illustrated based on the larger market share and the more detailed prior art plastic lidded cask.

Plastic lids are used as an inverted or screw cap preferably in plastic lid drums and are in DE 25 44 491 C2 . DE 42 36 338 C2 . EP 0 721 892 A1 . EP 0 781 234 B1 and DE 20 2006 004 354 U1 described. Plastic lidding barrels, have been known for some time, have a volume of 20 to 250 liters, consist of the following parts: a plastic drum body made of thermoplastic material, a slip lid made of thermoplastic material with inlaid or foamed seal and a U-shaped steel or plastic clamping ring, or they consist of only two parts: a plastic barrel body made of thermoplastic material and a screw cap made of thermoplastic material with inlaid seal.

Plastic lidded barrels are delivered as empty barrels in the closed state at the bottler, which opens, fills and closes them. Plastic lidded drums are sometimes used for the transport of liquids, their use for liquid dangerous goods requires a corresponding high stability. These plastic lidded drums are subject to certain requirements with regard to their storage and transport safety, which are tested and certified in special approval tests (eg jacket case, diagonal case on the edge of the lid, hydraulic internal pressure test, etc.).

Disadvantages of the prior art

• – Stülpdeckel mit Flansch (Flansch-Stülpdeckel)
• – Stülpdeckel ohne Flansch (Stülpdeckel) oder
• – Schraubdeckel ausgeführt und haben beim Einsatz für Flüssigkeiten bzw. flüssige Gefahrgüter nachfolgende Nachteile:

Plastic lids for plastic lidding barrels are according to the state of the art as

• - Slip lid with flange (flange slip-on lid)
• - Slip lid without flange (slip lid) or
• - Screw cap executed and have the following disadvantages when used for liquids or liquid dangerous goods:

DE 25 44 491 C2 : (bulbous plastic lidded barrel with flange slip-on lid and U-shaped clamping ring). In case of drop tests of 1.20 meters with liquid products, the flange slip-on lid jumps off.

DE 42 36 338 C2 : (bulbous plastic lidded barrel with reinforced U-shaped clamping ring and reinforced flange slip-on lid). In this embodiment, the flange slip-on lid in the inner circular lid area has been reinforced to achieve a safe internal hydraulic pressure test by a washer part, an inner web and a conical ring part, the U-shaped clamping ring has also been strengthened, but the manual closing of the clamping ring is very heavy , these plastic lidded drums must be closed under sealing presses.

EP 0 721 892 A1 : (large-volume bung barrel for the transport of viscous products with a screw-down lid with an outside diameter of 180 or 270 mm sunk in the topsoil). For a safe and liquid-tight closing a very large tightening torque on the screw cap apply.

DE 20 2006 004 354 U1 : this version is similar to the DE 25 44 491 C2 , has a flange slip-on lid, however, the U-shaped clamping ring has been significantly strengthened, extended its engagement height L-shaped, so that the clamping ring is heavier, considerably more expensive and also difficult to seal.

EP 1 086 021 B1 : (large-volume plastic lidded barrel with large opening, U-shaped clamping ring and slip-on lid with additional sealing holding bar). The manual closing of the clamping ring is very difficult, these plastic lidding barrels must be sealed under sealing presses.

A disadvantage of all known plastic lids that they are extremely elastic deformations as they arise in case tests with plastic lid barrels, the lidding barrels and thus the seal holding parts of the plastic lid are deformed so that the seal is relieved and thereby leaks arise.

A disadvantage is also in all known plastic lids that hydraulic pressure checks the plastic lid barrels, the seal holding parts of the plastic lid are only on one side, from the inside to be pressure loaded, the Seal retaining parts are deformed so that the seal is relieved and thereby leaks occur.

task

It is the object of the invention, the known plastic lid made of thermoplastic material for plastic barrels which are designed as a flange Stülpdeckel, slip lid or screw, so on to develop and improve so that the plastic lidded barrels, even at higher heights liquid-tight remain, the hydraulic internal pressure test safely exist and a simple manual closing of the U-shaped clamping ring when using slip-on lids or a secure gas and liquid-tight sealing with screw caps at lower tightening torques is possible.

Solution of the task

This object is achieved by plastic lid with the features of claim 1. The dependent claims contain advantageous and expedient developments of the invention.

The plastic lid for liquid-tight plastic lidding barrels according to the invention are characterized by the following advantageous embodiments: plastic lid (flange slip lid, Stülp- or screw cap) for a liquid-tight plastic drum for transport and storage of liquids in which the plastic lid is held by a clamping ring or a thread on the plastic barrel body, its sealing via an annular seal which seals against the sealing surface of the mouth of the barrel opening, the seal of additional seal holding parts axially and radially in the plastic lid, even in plastic -Deckel deformations as they occur during drop tests or hydraulic internal pressure tests, is held under prestress. The internal hydraulic pressure acts on both sides on the parts holding the seal, which are not deformed and do not relieve the seal. The previous versions of the plastic drum body and sometimes also the U-shaped clamping rings can be used in the use of the plastic lid according to the invention.

Drawings and sketches

The invention will be explained and described in more detail with reference to embodiments shown in the drawings. The 2 . 3 . 4 . 7 show the state of the art, the 1 . 5 . 6 . 8th - 12 the lid according to the invention. Show it:

1 a lidded barrel with inventive flange slip-on lid,

2 a partial section through the left upper head edge of a lidded barrel according to 1 with a known flange slip-on lid,

3 a schematic representation of the cross section of the drum cover area with the flange slip lid according to 2 , after a hydraulic internal pressure test over 30 minutes,

4 a schematic representation of the cross section of the drum cover area with another known reinforced flange slip-on lid, after a hydraulic internal pressure test for 30 minutes,

5 a partial section through the left upper head edge of a lidded barrel with a plastic lid according to the invention (flange slip-on lid),

6 a schematic representation of the cross section of the drum cover area with a flange slip-on lid according to the invention according to 5 , after a hydraulic internal pressure test over 30 minutes,

7 an enlarged partial section through the left upper head edge of a lidded barrel with a known flange slip lid according to 2 and marking the applied surfaces in a hydraulic internal pressure test over 30 minutes,

8th an enlarged partial section through the left upper head edge of a lidded barrel with the flange slip-on lid according to the invention 5 and marking the applied surfaces in a hydraulic internal pressure test over 30 minutes,

9 a partial section through the left upper head edge of a lidded barrel with another plastic lid according to the invention (flange slip-on lid),

10 another plastic lid according to the invention (screw cap),

11 another plastic lid according to the invention (screw cap) and

12 a partial section through the left upper head edge of a lidded barrel with another plastic lid according to the invention (slip lid).

description

In 1 is with the reference number 10 an inventive large-volume lidded barrel made of plastic with a capacity of z. B. 220 liters. The lidded barrel 10 consists of three parts, the bulbous barrel body 12 , which is preferably made in the blow molding of high molecular weight thermoplastic (PE-HD), the injection-molded flange slip-on lid 20 made of high molecular weight thermoplastic material and the U-shaped clamping ring connecting the two parts 11 , The clamping ring 11 consists of sheet steel or plastic and has a substantially trapezoidal, inwardly open cross section.

In 2 is a partial section through the left head of the out 1 known plastic lidded barrel 10 shown. The well-known flange slip-on lid 20 , in DE 25 44 491 C2 is described by means of a clamping ring closure 11 on the barrel body 12 held, with the clamping ring 11 one at a distance (about 50 mm) below the upper edge of the drum or the sealing surface 15 arranged jacket flange 13 engages underneath and a cover flange 21 engages over the outer lower edge of the lid. This is the seal 18 from the vertical outer edge 22 , the vertical lid inner edge 24 radially fixed and by the horizontal upper edge 23 against the sealing surface 15 of the mouth rim 14 of the barrel body 12 pressed, the seal of the lidded barrel 10 he follows. The interior of the inner dock 25 extended lid inner edge 24 , is from the circular lid interior 26 filled.

3 shows the flange slip-on lid 20 according to 2 , which has a U-shaped clamping ring 11 on a barrel body 12 is fixed and its deformation after a hydraulic internal pressure test with 100 kPa over 30 minutes. The circular lid interior 26 is domed outward "cambered", the circular lid interior 26 is in the position 26 , the inner edge 24 and the inner walkway 25 are in the positions 24 ' and 25 ' been moved, the upper edge 23 is in the position inside 23 ' been raised, the outer diameter of the upper edge 23 has been reduced by the "bombage". The bias on the seal 18 has been reduced, the seal 18 is no longer held axially and radially, the lidded barrel 10 is leaking.

4 shows an improved flange slip lid 20 ( DE 42 36 338 C2 ) and its deformation after a hydraulic internal pressure test at 100 kPa for 30 minutes. In the case of the hydraulic internal pressure test, a 220 liter lidded drum is used 10 with a diameter of the mouth edge 14 of 450 mm of the drum lid with 1590 kp loaded axially. The circular lid interior 26 will be "cambered", after 26 ' arched. The reinforced inner edge 24 and the reinforced inner bridge 25 reduce together with the annular disc part and the inner web the deformation of the inner edge 24 the lifting of the upper edge 23 of the flange slip-on lid 20 and thus the preload reduction on the seal 18 , A leakage of the lidded barrel 10 takes place only after a longer hydraulic internal pressure loading time.

In 5 a plastic lid according to the invention is shown, as produced in two parts, by the weld 33 the welding webs outer edge 31 and upper margin 32 welded flange slip-on lid 20 is executed, in relation to the known flange slip lid 20 according to 2 following additional rotationally symmetrical parts: horizontal seal retaining edge 34 and vertical seal retaining bar inside 35 , The seal 18 (inserted with a diameter of about 5 to 12 mm or foamed) becomes radially through the outer edge 22 and the seal retaining bar in 35 held and axially by the, the outer edge 22 and sealing stop in 35 connecting seal retaining edge 34 against the sealing surface 15 of the mouth rim 14 pressed. The welding of the welding webs outer edge 31 and upper margin 32 the weld 33 can be done by mirror welding. The seal retaining bar in 35 the flange slip-on lid according to the invention 20 can additionally via centering cam 37 of the mouth rim 14 of the barrel body 12 centered and at the coat case of the lidded barrel 10 be centrally supported.

6 shows the flange slip-on lid according to the invention 20 of the 5 on a barrel body 12 and its deformation after a hydraulic internal pressure test at 100 kPa over 30 minutes. The flange slip-on lid ( 20 ) is "cambered", the circular lid interior 26 is in the position 26 pressed, the upper edge of the lid 23 is in the position 23 ' been raised, the outer diameter of the upper edge 23 has decreased, seal retaining edge 34 and gasket-stay in 35 however, remain in starting position. The seal 18 becomes axially from the gasket retaining edge 34 and radially from the outer edge 22 and from the gasket-stay in 35 kept under tension, the lidded barrel 10 stays tight. Due to the "camber" of the flange slip-on lid 20 its outer diameter will be in the area of the upper edge 23 reduced, the seal retaining edge 34 and the gasket-retaining bar inside 35 wander inwards and downwards, the pressure on the seal 18 is thereby increased.

In the 7 and 8th be the well-known flange slip-on lid 20 according to 2 and the flange slip-on lid according to the invention 20 of the 5 in enlarged section in lock position on the left estuarine margin 14 of the barrel body 12 represented and the pressurized surfaces of the barrel body 12 (Ap Fk) and the flange slip-on lid 20 (Ap Kd) marked at the beginning of a hydraulic internal pressure test. Out 7 It can be seen that the internal hydraulic pressure of 100 kPa on the circular lid interior 26 , the inner walkway 25 and the inner edge 24 acts (Ap Kd). As the hydraulic internal pressure test progresses, the flange slip-on lid becomes 20 cambered, after the 30-minute test with 100 kPa is a flange slip-on lid 20 Deformation according to 3 reached, the seal 18 is no longer clamped, the lidded barrel 10 is leaking. The hydraulic internal pressure has that, the seal 18 holding areas of the flange slip-on lid 20 , Upper margin 23 and inner edge 24 from the seal 18 pushed away.

In 8th is the flange slip-on lid according to the invention 20 of the 5 by the hydraulic internal pressure, which makes the areas circular lid interior 26 , Inner bridge 25 , Inside edge 24 and upper margin 23 be charged, with increasing test duration also cambered, as in 6 shown the seal 18 holding parts seal retaining bar inside 35 and seal retaining edge 34 However, both sides with internal pressure (Ap Kd in 8th ), they remain thereby in their starting position, the seal 18 is not relieved in a hydraulic internal pressure test, the lidded barrel 10 stays tight.

The same advantageous behavior, no deformation of the parts the seal 18 hold, so no relief of the seal 18 , no leakage, with one-sided deformation of the circular inner cover area 26 outward by the surge pressure, is also on case tests, flat on the barrel body 12 , the water-filled lidded barrel 10 achieved. During the impact, the barrel body 12 Flattened in the impact area and the flange Sülpdeckel 20 deformed, the lid inner edge 24 and the lid inner bar 25 radially inward, strongest in the impact area, pulled and pushed axially outward, the lid upper edge 23 raised in its interior, but the seal holding parts are not deformed thereby. The extra, the seal 18 holding parts, stiffen the mouth edge 14 of the barrel body 12 radial and thereby reduce its deformation during impact.

In 9 is another inventive flange slip-on lid 20 illustrated with the the seal 18 fixing parts gasket holding web inside 35 , the seal retaining edge 34 the with axial support webs 38 is provided, the reduced in its wall thickness upper edge 23 of the flange slip-on lid 20 at occurring stack loads on the lidded barrel 10 support.

10 and 11 show invention as a screw cap 40 executed plastic lid on. The connection of the screw cap 40 to the barrel body 12 takes place over the outer edge 22 of the screw cap 40 the with internal thread 42 is provided and in closed position on the threaded connector 41 (dotted lines drawn) of the barrel body 12 is screwed on. The seal 18 is at the screw cap 40 according to 10 from the components seal holding web inside 35 and seal retaining edge 34 additionally fixed. At the screw cap 40 according to 11 becomes the seal 18 only from the inwardly inclined seal retaining edge 34 and the weatherstrip without 36 additionally fixed. Due to the inclination to the inside of the seal retaining edge 34 Can on the gasket-stay in 35 be waived.

In 12 is another inventive plastic lid as slip lid 50 shown with a welded U-shaped seal retaining ring 51 who's the seal 18 surrounds and on both sides on the sealing surface 15 of the jacket flange 13 down perpendicular. The seal retainer consists of the vertical seal retainer inside 35 , the horizontal seal retaining edge 34 and the vertical seal-retaining bar outside 36 which is in its lower area with the vertical outer edge 22 of the slip lid 50 over the weld 33 connected is. Also in this arrangement, the seal retaining ring 50 not deformed by the internal pressure in hydraulic internal pressure tests. The U-shaped clamping ring 11 the one hand on the slip lid upper edge 23 overlaps and on the other hand an outwardly projecting, at the upper edge of the keg 14 arranged jacket flange 13 engages, fixes the slip lid 50 in the closed state gas and liquid tight on the barrel body 12 ,

In a manner not further shown, the plastic lid according to the invention can be used in other plastic containers, for example, in inner containers of pallet containers, in injection-molded packaging buckets or injection-molded hobbocks.

In a manner not further shown, the plastic lid according to the invention can be equipped, for example, with a centrally located gas- and liquid-tight sealable bunghole opening in the size of 2 '' or 3 ''.

In another embodiment, the plastic lid according to the invention can also be equipped with one or two laterally arranged on the edge of the lid gas and liquid-tight sealable bung openings in the size of 2 '' and ¾ ''.

LIST OF REFERENCE NUMBERS

10

Opening barrel

11

Clamping ring ( 10 )

12

Barrel body ( 10 )

13

Sheath flange ( 12 )

14

Mouth edge ( 12 )

15

Sealing surface ( 12 )

18

Poetry ( 20 . 40 . 50 ))

20

Flange slip-on lid ( 10 )

21

Cover flange ( 20 . 40 )

22

Outer edge ( 20 . 40 . 50 )

23

Top margin ( 20 . 40 . 50 )

24

Inner edge ( 20 . 40 . 50 )

25

Inner bridge ( 20 . 40 . 50 )

26

circular lid interior ( 20 . 40 . 50 )

31

Welding edge outer edge ( 20 . 40 . 50 )

32

Welding bar upper edge ( 20 . 40 )

33

Welding point ( 20 . 40 . 50 )

34

Seal retaining edge ( 20 . 40 . 50 )

35

Seal holding web inside ( 20 . 40 . 50 )

36

Seal holding bridge outside ( 40 . 50 )

37

Centering cam ( 12 )

38

Support bridge ( 34 )

40

Screw cap ( 10 )

41

Threaded connector ( 12 )

42

Thread ( 40 . 41 )

50

Slip lid ( 10 )

51

Seal retaining ring ( 50 )

Ap Fk

acted upon surface of the barrel body ( 12 ) in a hydraulic internal pressure test

Ap Kd

applied surface of the plastic lid ( 20 . 40 . 50 ) in a hydraulic internal pressure test

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 2544491 C2 [0003, 0006, 0009, 0030]
• DE 4236338 C2 [0003, 0007, 0032]
• EP 0721892 A1 [0003, 0008]
• EP 0781234 B1 [0003]
• DE 202006004354 U1 [0003, 0009]
• EP 1086021 B1 [0010]

Claims (11)

Plastic lid ( 20 . 40 . 50 ) made of thermoplastic material for a liquid-tight plastic lidded barrel ( 10 ), or a container for liquids (inner container of pallet containers, molded packaging bucket), consisting of an outer edge ( 22 ), a top margin ( 23 ), an inner edge ( 24 ), an inner bridge ( 25 ) and a circular lid interior ( 26 ), the gas and liquid-tight seal in the closed state via a seal ( 18 ), which against the sealing surface ( 15 ) of the mouth rim ( 14 ) of the drum body ( 12 ), which serves as a flange slip-on lid ( 20 ) carried out via a U-shaped clamping ring ( 11 ) on a barrel body ( 12 ) is held, wherein the clamping ring ( 11 ) a distance below the upper edge of the drum or the sealing surface ( 15 ) arranged jacket flange ( 13 ) and a lid flange ( 21 ) overlaps the outer lower edge of the lid, or as a slip lid ( 50 ) carried out by means of a U-shaped clamping ring ( 11 ) on a barrel body ( 12 ) is fixed whereby U-shaped clamping ring ( 11 ) on the one hand on the lid upper edge ( 23 ) and on the other hand an outwardly projecting, at the upper edge of the keg ( 14 ) arranged jacket flange ( 13 ) engages, or as a screw cap ( 40 ) carried out with its outer edge ( 22 ) via a thread ( 42 ) with the threaded connector ( 41 ) of the drum body ( 12 ), characterized in that the seal ( 18 ) in addition of one with the outer edge 22 connected rotationally symmetrical horizontal seal retaining edge ( 34 ) in the plastic lid ( 20 . 40 . 50 ) is held axially. Plastic lid according to claim 1, characterized in that the seal ( 18 ) in addition of one with the outer edge 22 via the rotationally symmetrical horizontal seal retaining edge ( 34 ) connected vertical sealing holding web inside ( 35 ) is held. Plastic lid according to one of the preceding claims, characterized in that the seal ( 18 ) in addition of one with the outer edge 22 connected rotationally symmetrical vertical seal retaining web outside ( 36 ), an associated rotationally symmetrical horizontal seal retaining edge ( 34 ) and an associated vertical seal holding web inside ( 35 ) is held. Plastic lid according to one of the preceding claims, characterized in that the sealing retaining edge ( 34 ) with supporting webs ( 38 ) is the upper edge ( 23 ) is supported. Plastic lid according to one of the preceding claims, characterized in that the seal ( 18 ) in the plastic lid ( 20 . 40 . 50 ) by an inwardly inclined seal retaining edge ( 34 ) is fixed. Plastic lid according to one of the preceding claims, characterized in that in a hydraulic internal pressure test of the plastic lidded barrel ( 10 ) the seal ( 18 ) holding parts ( 34 . 35 . 36 . 51 ) of the plastic lid ( 20 . 40 . 50 ) are not deformed. Plastic lid according to one of the preceding claims, characterized in that in a hydraulic internal pressure test of the plastic lidded barrel ( 10 ) the seal ( 18 ) holding parts ( 34 . 35 . 36 . 51 ) of the plastic lid ( 20 . 40 . 50 ) are surrounded on all sides by the hydraulic internal pressure. Plastic lid according to one of the preceding claims, characterized in that the plastic lid ( 20 . 40 . 50 ) has a central gas- and liquid-tight sealable bunghole opening. Plastic lid according to one of the preceding claims, characterized in that the plastic lid ( 20 . 40 . 50 ) Has at least one laterally on the lid edge gas and liquid-tight sealable bunghole openings. Plastic lid according to one of the preceding claims, characterized in that the sealing holding web inside ( 35 ) of centering cams ( 37 ) of the mouth rim ( 14 ) of the drum body ( 12 ) is centered. Plastic lid according to one of the preceding claims, characterized in that it is made in two parts and in its outer peripheral region gas and liquid-tight welded.

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