ES2245463T3 - PACKING THAT CAN BE CLOSED AGAIN WITH COVER RING AND COVER INSERTED PRESSURE. - Google Patents

Abstract

The invention relates to press-in lids for forming a snug sealing fit therebetween, the internal wall (20b) and a cover ring (30, 30a, 30b) which has two vertical wall sections pointing upwards. The object of the invention is to act against quick-leak filling fluids, paints or glazes by sealing means but that it should be possible to re-close the press-in lid so that the seal provided is just as efficient. It should also be possible to print on or coat the cover surface (20a) of the press-in lid (20, 20a, 20b), it being possible to dry or bake said print or coating at a high temperature to provide externally information identifying the container contents sealed by the lid. It is also proposed to provide a press-in lid which does not have a coating in the edge region thereof or only has a internal lacquer coating (22b, 22). A thin layer (32, 32a) protecting against leakage is only applied to sides of the cover ring on its vertical inner wall (30b). Said layer protecting against leakage consists, in particular, of polypropylene. The snug sealing fit is achieved between the vertical wall (20b) of the press-in lid and the thin layer protecting against leakage on the cover ring.

Description

Container that can be closed again with a ring cover and cover inserted under pressure.

The technical field of the invention is packaging for housing filling fluids containing solvent or which have low solvent content and therefore are prone to creep, for example protection agents from the wood, and a cover ring in this regard for housing a snap-in insert that can be closed again (from abbreviated form: ED cover).

It is known from the document US-A 3,338.4567 (Continental Can Company) a close accessible to the technician, which works with improved friction between the cover ring and the cover, in which two collaborate pairs of shutter layers, which are directed outward and collaborate with shutter effect on two wall sections of a U-shaped groove and an end section of the lid in U shape, for the avoidance of the so-called "Popping", that is, of a kind of temporary detachment of sealing areas; See in this regard the publication mentioned in column 2, lines 42 to 60 as well as figures 2 and 3 shown there.

More and more products are filled that contain solvents or have a low solvent content (prone to creep) in round cans (round containers) and they close with an ED cover, which is pressed into a cover ring, which It can be closed again. The cover ring is connected to the Cap body by means of a folded seam. Sewing folded has, in general, a double fold.

Through the use has been put to the provision of generality a state of the art, in which a ED lid is provided with an inner lacquer coating and in addition to the lacquer a sealing means is still applied in the area of the seal between the cover ring and the cover inserted under pressure (lacquered by points or gummed ring). Alternatively, it has also been proposed replace the inside lacquered lid with a layer of polypropylene (PP). However, polypropylene is not in conditions to withstand higher temperatures, so that the lid mirror cannot be used as advertising surface, due to the application of a color badge for the color of the lacquer or wood protection agent found in the container. The mirror of the large surface lid itself cannot be use either for other technical information or information advertising The mirror print on the lid or the application of Colored lacquer on it would require drying or a drying process baked, which conditions temperatures greater than 150ºC, which damage or They burn the polypropylene on the underside of the lid.

They are known by technician from the document FR-A 817 603 (Desjardin), September 1937, Three variants to close a container for decades. In two of the variants described, the package has a lid ring, in the that a pressure cap is inserted, where a variant receives a additional shutter layer pointing out, which has been placed on the cover ring already during the manufacture of the cover ring This sealing layer consists of a soft flexible material, in a preferred way by a selection of different metals, which have been placed as a sheet on the white sheet of the lid. The lid does not lead in the third example no visible sealing layer, as is also the case in the DE-A 25 41 636 (Blechwarenfabrik, Limburg), from 1976. There is a sealing layer, in effect, alternatively, on the "top bottom" of a container or on the edge of a lid, but the arrangement is preferred on the lid, not on the top bottom and on its pointing surface radially inward, which delimits there the so-called "hole of filled ", see for example figure 2. The preamble of the claim 1 corresponds to document FR-A 817 603 (Desjardin), as indicated above.

Accordingly, the technical problem, before the that the invention is found, consists of an improved seal of the adjustment seat for the cover inserted under pressure and of the bent area in the case of creep prone filling fluids as well as creating the possibility of optically configuring the mirror of the lid, without the adjustment seat being influenced in its tight seal. However, the manufacturing.

This is achieved with the combination of characteristics of claim 1.

In a surprising way, the cover ring coated with the thin layer of creep protection, especially of polypropylene, it offers the basis so that you can suppress the compound in another usual case in the folded area (the usual sealing means), since the polypropylene layer, which is present inside the lid ring, is enough for the seal between the cover ring and the body From the can.

The creep protection layer in the shutter area therefore forms in its prolongation on a of the surfaces of the entire cover ring, also the new "compound", which fulfills the task of sealing in the fold (claim 7).

The problem mentioned above is solved also by means of a cover ring, which is coated in the inner side or bottom side, for connection with a container, the layer applied to the cover ring being a layer of creep protection, especially polypropylene (claim 3).

Therefore, not only the cover inserted under pressure It is coated with a PP material, but also the ring of the lid and, specifically, over its entire interior surface, which form, on the one hand, the folded seam for the fold and, on the other part, preset inward adjustment seat, set by a vertical wall, on the side of the body.

The lid and the lid ring are manufactured to from a sheet of metal.

It has been verified that with this configuration you can get a required clamping pressure in the area of sealing of the adjustment seat, the lid may be lacquered or not lacquered and an additional ring gummed can be suppressed, necessary still necessarily in the state of the art, as additional seal of protection against creep. The pressurized cover can also be used as a surface advertising It can be printed or lacquered at any time, since it is not already provided with a limited polypropylene in its temperature.

In a surprising way, the cover ring coated with the thin layer of creep protection, especially polypropylene, it offers the basis to suppress the compound in another usual case in the folded area (the means of usual sealing), since the polypropylene layer, which is present inside the lid ring, it is sufficient for the sealing between the lid ring and the can body. The creep protection layer in the sealing zone form, therefore, in its prolongation on one of the surfaces of the entire cover ring, also the new "compound", which It fulfills the task of sealing in the fold.

The required clamping pressures of> 0.5 Bars are achieved with the invention. Airtightness is reached maximum for creep-prone or filling fluids penetrating filling Those lacquered by points of the state of the technique can be suppressed, the same as the gummed ring. Additionally, it is possible to configure a lacquered inside, given the preferred case, of the lid, which can withstand high temperatures, without PVC, which takes into account the Environmental protection aspects.

Numerous trials have shown that with mentioned filling products, in vertical cans (or cans), laid or also inverted and at room temperature as well as in the incubator, already a 50 µm layer of polypropylene in the area of the adjustment seat offers absolute security against the outflow of stuffed product.

But the invention cannot be applied only in creep-prone filling fluids, but also has a field of application, which extends to filling products dry or moisture sensitive, that is, entry is prevented of moisture through the adjustment seat from the outside to the dry filling product. An application field of this type It consists of the milk powder filling, which must be closed after of opening again safely and without danger of being moisten

The invention (s) are explain (n) and complete (n) below with the help of several embodiments.

Figure 1 shows a fragment of the zone of seal D of a pressure insert cover 20. It shows a container body 10, a cover ring 30 disposed therein over a folded area 40 and the cover 30 inserted under pressure, which is adapted to a vertical wall 30b of the cover ring, with a cover mirror 20a.

Figure 2 is a fragment of Figure 1, which it is concentrated on the sealing zone D. The coatings 32a, 22 collaborate in the shutter zone D on the vertical wall 30b of the lid ring and vertical lid wall 20b Pressed in.

The container that can be closed again, represented in the fragment of figure 1, has a body of essentially round container 10, which forms on a marginal area 10a a double fold 40 with a cover ring 30. The ring of the lid is profiled and has a surrounding groove between its two vertical wall sections 30a, 30b, one of which is rests on the inner wall of the body of the container 10 and the other points essentially horizontal inward.

On the inner surface, which points towards inside, vertical wall 30b of the lid ring is configured an adjustment seat D for a pressure insert cover 20, which -a part of a mirror of the lid 20a- has a wall section surrounding 20b vertical, which collaborates with the inner wall mentioned of the cover ring 30b.

The inner wall section 20b of the lid 20 extends between a support flange 20c and the lid mirror 20a, extending the support flange 20c and the cover mirror 20a essentially parallel and perpendicular to the vertical wall 20b of the cover 20.

The vertical wall 20b of the insert cover 20 under pressure is provided with a flat but wide conformation, which It is adapted approximately in its extension to the vertical wall 30b of the cover ring. In this area, as you can recognize especially with the help of the figure, the seat of adjustment D of the sealing gasket, which offers no steps to the creep prone products.

Additionally, a board of still possible sealing between the support flange 20c and the outer area of a rolled up 31 rewind up the vertical wall 30b of the lid ring, either in a purely mechanical way or equally motivated by the extension of thin layer 32a of creep protection beyond the shutter zone D, until rolled up 31.

The surrounding flat groove 20b on the wall vertical is conducted on two staggered sections of different depth in the support flange 20c and in the mirror of the lid 20 a. The two staggered sections are surrounding; Of the same way that the flat groove 20b; as a support slot for reduced depth

The thin layer 32a projection against the creep, shown especially in Figure 2 only in the shutter zone D, is configured in the example of Polypropylene. It is fixedly fixed and with a thickness in the order of magnitude of 50 µm in the vertical wall 30b of the ring of the cover 30. It can be extended, in the case of a cover ring prefabricated, which is stamped from a sheet, which is fully covered with a layer of polypropylene, especially the cover ring on one side, extending through a corresponding conformation according to figure 1 the layer of polypropylene then in different places inwards (in the seal gasket area D), upwards (in the area of the rolled 32), down (in the area of the cover ring between the seal gasket seat D and the fold 40) and towards down and up (in the area of the fold 40). In all these zones of the cover ring, the unilateral coating of the ring the cover is sufficient to be able to assume the shutter function respective.

A shutter function assumes the layer of polypropylene in the area of the fold 40, instead of a means of shutter usually provided there, which can be suppressed. The Thin layer of creep protection is enough to be able to assume sealing functions also in the fold zone 40.

In the area of the sealing seat according to the Figure 2, together with the pressure insert cover, the The purpose of sealing is assumed by the polypropylene layer. The Cap has no additional sealing layer, but can be provided only with a lacquered, which resists temperatures higher, when the cover is provided in its cover thickness 20a, for example, with a lacquered, dried in the oven or dried Dry at high temperature. This layer can be a color layer for Color identification of the contents of the package, but also You can assume other information tasks.

The thickness of the protective layer against creep 32, which is designated with 32a in the shutter zone D, may vary, but remains reduced and is selected in the range between 30 and 200 µm, depending on the thickness of the sheet and of the creep prone filling product, such as lacquer, paint or enamel.

If the lacquer coating is applied, it has been described above in relation to the lid 20, then it should procure a lacquer coating essentially free of PVC, of anyway you can suppress the PVC sealing layers in the seal area.

Claims (8)

1. Container (10) that can be closed again, with an adjustment seat in the snap-in cover on a ring (30) of the lid, for filling with a filling fluid prone to creep, such as lacquer, paint, enamel or protective primer the wood, in whose packaging the adjustment seat of the lid of Pressure insertion has a sealing zone, in which

(to)

the sealing zone is provided on the side (30b) of the ring (30) of the lid, which is folded at the upper edge (10a) of the body of the container (10) on a folded area (40), with a layer of creep protection;

(b)

from so that a sealing zone on the side of a cover (20; 20a, 20b) under pressure insertion, you don't have to wear any layer creep protection or just a coating of lacquer (22b, 22);

characterized in that the creep protection layer (32, 32a) extends essentially over the entire lower side of the ring (30) of the lid and to the folded area (40) at the upper edge of the container body (10) and as a thin layer, it is essentially thinner than the thickness of the sheet metal of the ring (30) of the lid. 2. Container according to claim 1, with the lid of pressure insertion, in which the lacquer coating covers essentially the entire bottom side (22) of the cover (20; 20a, 20b) of pressure insertion. 3. Package according to one of the claims above, in which the thin layer (32, 32a) of protection against Creep is polypropylene (PP). 4. Container according to one of the preceding claims, wherein the creep protection layer (32, 32a) has a thickness between 30 µm and 200 µm, especially 50 µm, or is between 50 µm and
100 µm. 5. Package according to one of the claims above, in which the lacquer coating (22, 22b) of the lid (20) is essentially completely free of PVC. 6. Container according to claim 1, wherein on the lower side of the ring (30) of the cover is not provided no coat of lacquer and in the sealing zone is not provided no sealing agent ring layer as lacquered by points. 7. Package according to one of the claims above, in which the folded area (40) is not provided no sealing means or additional compound. 8. Package according to claim 1, with the lid (20) snap-in, in which a vertical section of the wall (20b) of the pressure insert cover (20) is provided, for insertion into the ring (30) of the lid, with a groove surrounding shutter (20b), which has a depth only reduced and a flat groove bottom, to correspond with the groove bottom width (20b) approximately to one axial height of an inner wall (30b) of the cover ring.