EP0835212B1 - Reclosable container with cover ring and press-in lid - 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

The technical field of the invention are containers for receiving solvent-containing or solvent-poor and thus creeping-filling fluids, For example, wood preservatives, and a related cover ring for resealable recording of a push-in lid (short: ED cover).

From US-A 3,338,456 (Continental Can Company) a closure is available to those skilled in the art, which works with improved friction between the cover ring and cover, wherein two pairs of sealing layers cooperate, which are directed outwards and on two wall sections of a U-shaped bead and a U-shaped end portion of the lid sealingly cooperate to avoid the so-called "Poppings", ie a kind of temporary release of sealing zones, see. to the mentioned font in column 2, lines 42 to 60 and the local figures 2 and 3.

Increasingly, solvent-containing and -arm (creeping) Goods in round containers (round containers) filled and with an ED cover, which in a lid ring is pressed, resealable closed. The lid ring is connected via a seam with the can body. The seam is usually a Double fold.

Through use, a prior art has become available to the public, in which an ED lid is provided with an interior paint coating and in addition to the paint still a sealant in the sealing area between Cover ring and Eindrückdeckel is applied (spot varnish or Ringgummiervng). Alternatively, it has also been proposed, the interior painting to replace the lid with a layer of polypropylene (PP). Polypropylene is However, unable to withstand higher temperatures, so that the Cover mirror of the cover as advertising space, by applying a Color coding for the color of the paint in the container or Wood preservative can not be used. Also, the in itself large area Cover mirror not to be used for other technical and promotional information. Printing the lid mirror or applying paint on it would require a drying or baking process, the temperatures of more than 150 °, which damage the polypropylene on the underside of the lid or burn.

From FR-A 817 603 (Desjardin) of September 1937, three variants for closing a container have been available to the person skilled in the art for decades. In two of the variants described, the container carries a cover ring in which a push-in lid is inserted, wherein a variant receives an outwardly facing additional sealing layer which has been placed on the cover ring already in the manufacture of the cover ring. This gasket layer consists of a soft, resilient material, preferably a selection of different metals, which have been placed as a foil on the tinplate of the lid. The lid carries in the third example no apparent gasket layer, as in DE-A 25 41 636 (Blechwarenfabrik Limburg), from 1976 is the case. There, a gasket layer, although altematively arranged on the "topsoil" of a container or on the edge of a lid, but preferably the arrangement on the lid, not on the topsoil and on its radially inward-facing surface, which limits the so-called "filling hole" there , see. the figure 2 there. The preamble of claim 1 corresponds to FR-A 817 603 (Desjardin), as stated above.

The technical problem faced by the invention is therefore one better sealing of the snug fit for the Eindrückdeckel and the folding area at creeping filling fluids as well as creating the possibility of the lid mirror To make visually, without the fit is affected in its tightness. The Production should nevertheless be simplified.

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

Surprisingly, the offers with the thin creep protective layer, in particular Polypropylene, coated lid ring the basis for the usual Compound in the rebate to be omitted (the usual sealant), as the inside the lid ring existing polypropylene layer to seal between Cover ring and can body is sufficient.

The creep protective layer in the sealing area thus forms in its extension over the a surface of the entire lid ring also the new "compound" that the Sealing task in the fold fulfilled (claim 7).

The aforementioned problem is also achieved by an inside or a bottom side coated cover ring for connection to a container, wherein the am Cover ring attached layer a creep protective layer, in particular Polypropylene is (claim 3).

The Eindrückdeckel is therefore not coated with a PP material, but the Cover ring, on its entire inner surface, on the one hand to the Fold forms the Fatznaht and on the other hand from the inside of a vertical wall designed snug fit on the side of the fuselage pretends.

The lid and lid ring are made of a metal sheet.

It has been found, däß with this configuration, a required contact pressure can be achieved in the sealing region of the fit, the lid painted or can be unpainted and still required in the prior art additional Ringgummierung can be omitted as additional creep seal. The Eindrückdeckei can continue to be used as advertising space. He is always printable or paintable, as it is no longer with one in its temperature limited polypropylene is provided.

Surprisingly, the offers with the thin creep protective layer, in particular Polypropylene, coated lid ring the basis for the usual Compound in the rebate to be omitted (the usual sealant), as the inside the lid ring existing polypropylene layer to seal between Cover ring and can body is sufficient. The creep protective layer in the Sealing area thus forms in its extension over the one surface of the entire Cover ring also the new "compound", which fulfills the sealing task in the fold.

Required contact pressures of> 0.5 bar are achieved with the invention. It will achieved a high density for creeping or penetrating filling fluids. Spotlacfcierungen of the prior art can be omitted, as well as Ringgummierungen. In addition, there is the possibility of a possibly be provided Interior coating of the lid, which can withstand higher temperatures without PVC, which takes into account environmental aspects.

Extensive tests have shown that with the mentioned contents at standing, lying or upside down cans (or containers) and at Room temperature and in the incubator already a 50 micron layer of polyproplene in the Paßsitzbereich offers absolute product leakage safety.

However, the invention can not only be applied to creeping filling fluids It also has a scope that goes as far as dry and dry Moisture-sensitive contents, so preventing the entry of Moisture through the snug fit from the outside into the dry product. Such a Field of application lies in the bottling of dry milk, which also after the Start again safely and be closed without risk of dampening got to.

Figur 1

ist ein Ausschnitt des Dichtbereiches D eines Eindrückdeckels 20. Gezeigt ist ein Behälterrumpf 10, ein über einen Falzbereich 40 daran angeordneter Deckelring 30 und der an einer vertikalen Wand 30b des Deckelrings eingepaßte Eindrückdeckel 20 mit einem Deckelspiegel 20a.

Figur 2

ist ein Ausschnitt aus der Figur 1, der auf den Dichtbereich D konzentriert ist. Beschichtungen 32a,22 wirken im Dichtbereich D an der vertikalen Wand 30b des Deckelrings und der vertikalen Wand 20b des Eindrückdeckels zusammen.

The invention (s) are explained and supplemented below with reference to several embodiments.

FIG. 1

is a section of the sealing region D of a Eindrückdeckels 20. Shown is a container body 10, a arranged on a rabbeting portion 40 thereon cover ring 30 and fitted on a vertical wall 30b of the cover ring Eindrückdeckel 20 with a cover mirror 20a.

FIG. 2

is a detail of Figure 1, which is concentrated on the sealing area D. Coatings 32a, 22 cooperate in the sealing region D on the vertical wall 30b of the cover ring and the vertical wall 20b of the push-in cover.

The resealable container shown in the detail in FIG. 1 has a substantially round container body 10 which forms a double fold 40 with a lid ring 30 over an edge region 10a. The cover ring is contoured and carries a circumferential bead between its two vertical wall portions 30a, 30b, of which the latter two abuts directly against the inner wall of the container body 10 and the other points substantially horizontally inwards.

On the inwardly facing inner surface of the vertical lid ring wall 30b is a Fit D for a Eindrückdeckel 20 geditdet, which - starting from a Cover mirror 20a - has a vertical, circumferential wall portion 20b, with the mentioned inner wall of the cover ring 30b cooperates.

The inner wall portion 20b of the lid 20 extends between one Support flange 20c and the lid mirror 20a, wherein support flange 20c and Cover mirror 20a substantially parallel and perpendicular to the vertical wall 20b of the lid 20 run.

The vertical wall 20b of the push-in lid 20 is a flat but wide Impression provided on the vertical wall 30 b of the cover ring in her Extension is approximately adapted. In this area, especially with reference to the figure 2 Recognizable, the seal fit D formed, the creeping goods none Passage offers.

In addition, a seal between the support flange 20c and the Outer portion of an up rolled over curling 31 of the vertical cover ring wall 30b possible, either purely mechanically or also caused by the Extension of the thin creep protective layer 32a beyond the sealing region D, in the curling 31.

The circumferential flat bead 20b in the vertical wall is over two different depths Stepped sections in the support flange 20c and in the cover mirror 20a passed over. The two step sections are circumferential, as well as the flat bead 20b; when Plant groove with shallow depth.

The thin creep protective layer 32a shown especially in FIG. 2 only in the sealing region D is designed in the example of polypropylene. She is firm and with a thickness in the Order of 50 microns on the vertical wall 30 b of the cover ring 30th appropriate. You can look at a prefabricated lid ring made of a sheet metal punched, which is completely covered with a polypropylene layer over which entire Decketring extend on one side, whereby by a corresponding Shaping according to Figure 1, the polypropylene layer then at various points inwards (in sealing area D), upwards (in rolling area 31), downwards (in the lid ring area between seal seat D and rebate 40) and inwards and upwards (in the folding area 40). In all these areas of the cover ring is sufficient one-sided coating of the cover ring in order to take on each sealing function can.

A sealing function takes over the polyproylene layer in the region of the fold 40, instead of a sealant usually provided there, which can be omitted. The thin creep protective layer is sufficient to also in the rebate area 40 To be able to assume sealing functions.

In the area of the seal seat according to FIG. 2, together with the Press-in lid takes over the sealing task through the polypropylene layer. The lid has no additional gasket layer, it can only with a paint job Be equipped to withstand the higher temperatures when the lid in his Lid mirror 20a e.g. is provided with a paint that burned or at high temperature is dried. This layer can be a color layer for Marking the color of the container contents may be others take over information tasks.

The strength of the creep protective layer 32, denoted 32a in the sealing region D. is, may vary, but remains low and is in the range between 30 and 200 microns selected, depending on the sheet thickness and the creeping content, such as paints, Color or glaze.

If the paint coating that was previously addressed at the lid 20, applied, so should pay attention to a substantially PVC-free paint coating PVC sealing layers in the sealing area can be omitted anyway.

Claims (8)

1. Re-closable container (10) with press-in lid snug seat and lid ring (30) for filling with a quick-flow filling fluid, such as lacquer, paint, glaze or wood-protecting primer, in which container the press-in lid snug seat has a sealing region, wherein

   (a) the sealing region on sides of a press-in lid (20; 20a, 20b) does not have a flow-protecting layer or has only one lacquer coating (22b, 22);

   (b) the sealing region on the side (30b) of the lid ring (30) folded over a folding region (40) on the upper edge (10a) of the container body (10) is provided with a flow-protecting layer (32, 32a);

   characterised in that the flow-protecting layer (32, 32a) extends over essentially the entire underside of the lid ring (30) and as far as the folding region (40) on the upper edge of the container body (10) and as a thin layer is considerably thinner than the sheet metal thickness of the lid ring (30).
2. Container according to claim 1, in which the lacquer coating covers essentially the entire underside (22) of the press-in lid (20; 20a, 20b).
3. Container according to one of the previous claims, in which the thin flow-protecting layer (32, 32a) is made from polypropylene (PP).
4. Container according to one of the previous claims, in which the flow-protecting layer (32, 32a) has a thickness between 30 µm and 200 µm, in particular 50 µm, or lies between 50 µm and 100 µm.
5. Container according to one of the previous claims, in which the lacquer coating (22, 22b) of the lid (20) is essentially completely PVC-free.
6. Container according to claim 1, in which no lacquer layer is provided on the underside of the lid ring (30) and no additional sealing agent annular layer is provided as spot lacquering in the sealing region
7. Container according to one of the previous claims, in which no additional sealing agent or compound is provided in the folding region (40).
8. Container according to claim 1, wherein a vertical wall section (20b) of the lid (20) for insertion in the lid ring (30) is provided with an annular sealing bead (20b), which has only low depth and a flat bead base in order to correspond, with the width of the bead base (20b), approximately to an axial height of an inner wall (30b) of the lid ring.

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