DK165586B - CONTAINER CLOSER - Google Patents

Abstract

A container is sealed by the use of a cover. In the applied position of the cover there is an annular sealing bead between the container and the cover, said sealing bead being secured to both the container and the cover and being adapted to absorb mechanical shear between the two parts produced by an outer mechanical force.

Description

BACKGROUND OF THE INVENTION The present invention relates to a closure device for a lidded container and of the kind specified in the preamble of claim 1, preferably for storing and transporting liquid materials, especially dangerous liquids such as wood preservatives, lacquers and paints.

With the increasing demands placed on the protection of the environment, the safety of the persons working with hazardous liquids and the like, the requirements for the packaging materials are delivered, transported and stored.

The term "hazardous liquids" covers many different materials which, by improper treatment, may pose a risk to the person working with the materials and the environment in the form of fire hazards, etc.

15

Therefore, there are e.g. developed containers and lids with a cooperating closure device. The lid is here adapted to be mounted on the container, so that a circular material portion of the lid engages the container. In addition, the circumferential material portion may have a circumferential bead so that the lid diameter at the bead is slightly larger than the adjacent diameter of the container. This results in a tight closure of the container, but this closure cannot survive even modest mechanical stresses, e.g. in the form of low altitude falls. This disadvantage has been sought to be compensated by increasing the mechanical coupling between the lid and the container, by additionally providing the coupling with separate clamps or a circular rail. This increases the resistance to mechanical effects to some extent, but even small deformations of the container-lid contact area will continue to cause leaks. At the same time, it is made more difficult to remove the lid of the container as the clamps must first be removed or the circumferential rail must be broken.

From US 2 117 807 a closure device is known for a container in which a lid is provided with a rubber gasket of a 35

DK 165586B

2 facing the container, circumferential surface. When mounting the lid, the gasket is compressed, which is then kept compressed by means of a circular ring or clamps.

Such a ring increases manufacturing costs, increases the number of working steps, when closing the container, and necessitates the use of special tools when opening. If, due to external influences, the lid should be displaced relative to the edge of the container, the compressed packing will only slightly prevent the contents of the container from flowing out.

The invention therefore aims to provide a closure device for a container of the kind set forth in the preamble, wherein the container with the closure device will be capable of surviving even a substantial deformation of both container and lid, without any leakage. Of course, this should not increase material consumption or significantly impede workflow. Furthermore, when the contents are to be used, the container must, of course, be opened, 20 without the need for special tools.

This object is achieved as claimed in the characterizing part of claim 1, whereby between the lid and the container body is provided a circumferential bead of a deformable material adapted to absorb through deformation the effects of the container.

According to the invention, a circumferential bead is provided between the closure regions of the container and the lid. Tufts are associated with the closure areas by adhesion. The bead is deformable and may consist of a blasted plastic material. This will allow a significant displacement between the lid and the container to be absorbed into the bead - without breaking it. The chance of container and contents surviving even significant external influences is greatly increased by the closure device of the invention.

3

As stated in claim 2, the closure areas of the container as well as the lid can advantageously be provided with circumferential beads, where at least one of the beads is applied to adhesive. This results in a good adhesion between the container and the lid.

For some types of adhesive, as stated in claim 3, it may be appropriate to apply this to both closure areas.

10

Claim 4 indicates how, in a preferred embodiment, the bead consists of a plastic material which, as stated in claim 5, can be accommodated in a circular channel, whereby the container achieves unprecedented resistance to external mechanical stresses. The closure area may be provided with roughness, e.g. in the form of burrs or scratches, thereby improving the adhesion of the plastic material to the closure area.

In order that the lid may later be removed from the container, the adhesive may be applied as claimed in claim 7. By forming the closure device as set forth in claim 8, the bead of the deformable material and the adhesive need not be resistant to the container. 25 teams. The feature of claim 9 helps increase the size of the deformation the closure device can absorb before a mechanical impact causes leakage.

The invention will now be explained in connection with preferred embodiments and with reference to the drawing, in which: FIG. 1 is a perspective view of a container with a closure device according to the invention; FIG. 2 is a sectional view of the one shown in FIG. 1, shown on line 2-2; 35

DK 165586B

4 FIG. 3 shows the one shown in FIG. 2, wherein the lid and container are shown separately? FIG. 4 shows an alternative embodiment of a closure device according to the invention; and FIG. 5 shows a further alternative for the closure device according to the invention.

10 In FIG. 1 shows a container 10 with which the closure device according to the invention can be used. The container 10 is shown to be cylindrical in shape, but there is nothing to prevent the closure device from being applied to containers of other shapes, e.g. with square or rectangular cross section, if this is deemed appropriate for better space utilization during transport. The container 10 can advantageously be slightly cone-shaped, so that empty container bodies can be stacked before filling with contents.

The container 10 comprises a lid. 18 and a container body 16 with a bottom not shown, wherein the container as a whole in this example is made of sheet metal or tin with a material thickness of the order of 0.25 mm, and is otherwise shaped in known manner, e.g. using out-rolling and birthing. Furthermore, the container body 16 may have a handle 12 pivotally attached to two holders 15 which are fixed to the container body 16 by soldering, spot welding or the like. The container 10 is closed by mounting the lid 18.

30

FIG. 2 and 3 show, in section, the closure device of the container 10. When the handle 12, 15 is disregarded, the container 10 can in this case be considered to be substantially rotationally symmetrical. The lid 18 is produced by punching a circular disc out of a tin plate there, e.g. for paint buckets typically will have a thickness of between 0.15 mm and 0.50 mm. The disc is molded so that the lid comprises a central, generally plate-shaped portion 22, which is outwardly defined by a circumferential portion 21 by an also circumferential channel 21. The exterior of this channel is provided with a circumferential elevation 22 in the radial direction of the lid 18. This elevation 22 acts, as will be later described, as part of a primary seal by mounting the lid 18 on the container body 16. The sheet material then extends upwardly and is folded outward in the radial direction of the lid 18 and is again folded, so that the rim of the disc-shaped sheet material forms a circumferential channel 23. This channel 23, as will be apparent from the description later, forms the basis for applying a deformable sealing material.

In this case, the container body 16 consists of a substantially cylindrical casing 30, which ends upwardly in a cylindrical portion 32, through a shoulder 31, the function of which is to increase the diameter of the container body from the casing 30 to the cylindrical portion 32. cylindrical 20 cls form part of a joint 33, where the container body 16 is attached to a rim 34, where the joint e.g. can happen by birth. The rim 34 extends from the joint 33 downwards to form a shoulder portion 35 which continues in a folded portion 36 and terminates in an outwardly extending flange 37 which, like the channel 23, is adapted to hold the sealing means.

In the preferred embodiment, the sealant is a PVC plastic material which is applied to the lid in the region 30 adjacent to the channel 23 and extends downwardly therefrom to the elevation 22. Similarly, the sealing material is applied to the area around the shoulder portion 35 and below the outwardly extending flange 37. Along with the lid 18 and the rim 34, the sealant is heated to a suitable temperature so that it cures and assumes a soft, yet firm and cohesive state. The sealant is added in advance with an additive so that it

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6 equal heating releases nitrogen in gaseous form. Thereby, small blisters are formed in the beads 40 and 41 on the lid 18 and the rim 34, respectively. A number of products are known on the market, of the kind mentioned, where the material after cooling is inflated deformably and partly elastically.

In the preferred embodiment, the sealing bead 40 and a portion of the outer wall of the lid thereon are applied to the elevation 22 an adhesive such as e.g. may be a vinyl-acetate-acrylic dispersion adhesive. For reasons of stacking of the containers before use, it is advisable that the lid be applied to the adhesive, as it may otherwise be difficult to separate the stack of empty containers when filling them.

15

Upon closing the container, the lid 18 is, in a known manner, pressed down over the rim 34 of the container, as seen in FIG. 3. It should be noted that the elevation 22 is adapted to grip the folded portion 36, or in a circumferential groove 20 therein. Thus, in the preferred embodiment, the elevation 22 will act as a primary seal of the bucket. Thus, the closure device according to the invention functions as a secondary seal where the binder fixes the two sealing beads 40, 41 relative to each other and these beads 40, 41 are fixed to the lid 18 and the rim 34, respectively, through the adhesion of the acrylic material to the metal surfaces and partly through it. mechanical retention obtained through the channel 23 and the outwardly extending flange 37.

The folded portion 36 may be formed so that a channel for receiving sealant is formed between the walls 30. This will increase the retention of the sealing bead 41. The extent of the adhesive applied to the lid is often desired to be limited to simply covering the sealing bead 40, as it may otherwise be difficult to remove the lid when the container 35 is to be opened. As shown in FIG. 2 and 3, the sealing beads 40, 41 will be compressed during application of the lid.

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7

Upon impact on the container envelope 1 near the rim area, the container portions will deform and a displacement may occur so that the primary closure no longer holds tightly, but the two sealing beads 40, 41 are fixed by their 5 and the adhesion to the lid 18, respectively. and the rim 34 capable of accommodating a not insignificant displacement. A container with the closure device according to the invention is by simple means and more efficiently capable of performing the holding function which otherwise required a securing ring.

FIG. 4 shows an alternative embodiment of a closure device according to the invention, in which the container body has correspondingly a wrapper 130, a shoulder 131, a cylindrical part 132 and a joint 133. The lid still has a central plate-shaped part 120 which, like previously proceeds outwardly in an upwardly extending channel 121 made upwardly with a abutment surface 124, which upon assembly is arranged to hold the lid in one mechanically stable position through abutment against a circumferentially rigid bead 138. The rim 134 of the container body 16 is made with a sealing bead 141 which, like the embodiment described above, can be mechanically fastened by suitable bending of the sheet metal constituting the rim 134. For the sake of stacking, the bead facing portion of the outer wall of the channel 121 will be made with a suitable adhesive. As can be seen, the sealing bead now constitutes the primary seal, while the secondary seal is provided by the abutment surface 124 and 30 of the annular ring 138. It will be appreciated that using a sealing bead 141 of a PVC plastic material must be required. that this plastic material is resistant to the contents of the container. It will also be appreciated that adhesive requirements must be set for it to be able to ensure sufficient adhesion to the metal plate with which the bead 141 is in contact.

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8 Instead of using an adhesive in this case, it may be convenient to provide a container closure machine with a heat sensor which is brought into contact with the metal parts surrounding the PVC material. Hereby, a local heating of the sealing bead may occur so that it is first cured and then inflated to assume suitable material properties. Thus, the sealing bead 141 will be able to achieve the necessary adhesion through heating without the need for additional adhesive.

10 In FIG. 5 shows a third embodiment in which a sealing bead 240 is arranged in a circular channel 223 on the lid. The rim of the container body has a abutment surface 239, where the bead 240 is arranged, by mounting the lid, that 15 could be fixed to the abutment surface 239 by either heating or applying an adhesive. In addition, the lid is provided with a circumferential protrusion 224 in a radial direction in the outer wall of the channel 221. The protrusion 224 is adapted to be accommodated in a complementary circumferential groove 238 in the container rim by placing the lid on the container body 20. Hereby, the elevation 224 and the groove 228 will form a primary seal, while the bead 240 and the abutment surface 239 constitute the secondary seal.

By placing a deformable and resilient material between the lid 18 and the container body 16, it is achieved that this material is largely capable of absorbing displacements in the contact surfaces between the lid 18 and the container body 16. The lid can also advantageously be shown, as shown. having a circumferential channel 21, 121, 221 which further makes the lid appear resilient, thereby enhancing the effect of the sealing bead 40, 41, 141, 241 in a positive direction.

The invention has hitherto been described with reference to a sheet metal container, but there is nothing to prevent the same benefits from being obtained from a container of a plastics material which is optionally fiber-reinforced.

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9

However, other materials may also be considered. Tombstones have been described as being a PVC material, but other materials are useful since such a sealing material should be capable of being simply attached to the container body 16 and lid 18, as well as exhibiting appropriate material properties in terms of deformability and elasticity.

Although a container with a sealing bead according to the invention is capable of surviving strong mechanical external influences, removing the lid 18 when using the container is no problem.

15 20 25 30 35

Claims (9)

A closure means for sealing a container (10) tightly by placing a lid (18) on a container body (16), the lid (18) having a circumferential closure region (21, 22; 121, 124; 221, 222), which, when mounting the lid, is arranged to abut against a similar circumferential closure region (34; 134; 238) on the body (16) of the container, wherein at least one of the two closure regions (21, 22; 34; 121, 124, 134; 221, 222, 238) are coated with a circumferential bead (40, 41; 141; 240) of a deformable material, characterized in that at least one of the closure regions (21, 22, 34; 121, 124, 134) ; 221, 222, 15 238) is additionally applied to an adhesive, whereby the closure areas (21, 22; 121; 221, 222) of the lid (18) are connected to the container body (16) by mounting the lid (18). closure regions (34; 134; 238) via the deformable bead (40, 41; 141; 240), the adhesive 20 bonding the bead (40, 41; 141; 240) to the adhesive closure region (21, 22, 34; 121, 124, 134; 221, 222, 238). A closure device according to claim 1, characterized in that both closure regions (21, 22, 34; 121, 124, 134; 221, 222, 238) are lined with circumferential beads (40, 41; 141; 240) deformable material. Closure device according to claim 1 or 2, characterized in that both closure regions (21, 22, 34; 121, 124, 134; 221, 222, 238) are applied to adhesive. A closure device according to claims 1-3, characterized in that a circumferential bead (40, 41; 141; 240) in a closure region is made of a so-called compound in the form of a blasted plastic material which is fixed to the closure region (21 , 22, 34; 121, 124, 134; 221, 222, 238) through DK 165586 B 11 adhesion. A closure device according to claim 4, characterized in that respective closure regions (21, 22, 34; 121, 124, 5 134; 221, 222, 238) have a circumferential edge forming a channel (23, 37; 134; 223 ) to absorb part of the inflated plastic material. Closure device according to claim 4, characterized in that the closure region (21, 22, 34; 121, 124, 134; 221, 222, 238) is provided with roughness. A closure device according to claims 1-6, characterized in that the closure regions (21, 22, 34; 121, 124, 134; 15 221, 222, 238) are substantially applied to adhesive only on those of the beads (40, 41; 141; 240) formed abutments. A closure device according to claims 1-7, characterized in that the seal formed by the deformable bead (40, 41; 141; 240) 20 is a secondary seal and furthermore a circumferential region (22, 36; 124, 138; 224, 238) adapted to form a primary seal with the container. 25 Closure device according to claims 1-8, characterized in that the lid (18) furthermore has a circumferential resilient channel (21, 121, 221) along the rim. 30 35