RU2673619C2 - Lid structure for container - Google Patents

Abstract

FIELD: package and storage.

SUBSTANCE: lid for a container, having a peripheral wall extending to an upper edge and defining a product containing space. Lid structure (3) comprises lower frame (8), upper frame (10) and lid (12). Lower frame connects to the upper edge of tub (2) and defines an access opening giving access to the product containing space. Upper frame is connectable to the lower frame in a snap-fit connection and forms a circumferential first seal therewith. Lid is arranged to close the opening, the lid and the upper frame forming a circumferential second seal.

EFFECT: improved sealing connection can be achieved and the upper frame can be manufactured separately from the lower frame and joined thereto at a later stage of the production process.

21 cl, 10 dwg

Description

FIELD OF TECHNOLOGY

The present invention relates to containers for packaging and dispensing products, in particular powder products, such as baby food or infant formula. The invention relates in particular to the construction of a lid for such a container having a lid with the possibility of re-closing.

BACKGROUND

Powdered material, such as infant formula, has been sold in various forms of packaging for many years. Metal cans were initially the preferred container because they were relatively light and cheap to manufacture and could be sealed for long-term storage. The seal contained aluminum foil over the entire opening of the container, which was removed upon first use. Since one container could be used for a long period, the containers were provided with resealable plastic lids that were fixed to the outer rim of the metal can. A measuring scoop was often supplied with the container, or was packed separately or inside the can itself. Such banks, however, are relatively difficult and expensive to produce.

More recently, alternative forms of packaging have become available that enhance existing banks. These include container bodies of laminated material and the construction of a plastic lid on hinges and a rim that can be glued to the container body. One such package, described in US Pat. No. 2,008041861, has a seal to close the original package and the space between the seal and the top edge of the container for receiving, in part, the scoop before use. Part of the container may contain laminated material from cardboard, metal foil and plastic. Another similar packaging is shown in WO2010071424.

Sealing such packages after the initial opening is the main problem in developing the design of the lid. Packaging that should be used with infant formula or other foods should be sealed sufficiently to prevent the entry of ticks or similar creatures. A maximum opening of 70 μm was found to be desirable. In other situations, an even better seal may be required to prevent moisture from entering. The conflicting demands of a large hole for easy access to the scoop are difficult to match with a cost-effective design. In particular, for single-use packaging, the amount of material that can be used sparingly in the construction of the lid limits its strength. The relatively easily deformable cap is also more difficult to effectively seal with a rim that also deforms. Existing structures, such as those shown in US2008041861, use lid and rim designs, sometimes referred to as toptainers, which connect to the free upwardly protruding edge of the container body. This compound is also critical in container sealing. Another development shown in WO2008083141 uses an optional integrated gasket to aid in sealing.

A container for storing paint or other liquids is described in US patent 5975346A. The container comprises a housing having a lower wall and a side wall extending from the lower wall along the perimeter of the lower wall, which ends in the upper rim. The container also includes a peripheral retaining ring attached to the upper rim, and a lid that is removably mounted and rotatable on the annular retaining ring to move between the open position and the closed position.

In the light of these design requirements and limitations, it would be desirable to improve existing developments.

SUMMARY OF THE INVENTION

According to the invention, there is provided a lid structure for a container having a side wall extending to the upper edge and forming a space for containing the product, the lid structure comprising: a lower frame for connecting to the upper edge of the tray, the lower frame forming an access opening providing access to the space containing the product; the upper frame, made with the possibility of connection with the lower frame by clicking and forming the first peripheral seal with it; and a cover configured to close the opening, the cover and the upper frame forming a second peripheral seal. Thus, an improved sealing joint can be achieved, and the upper frame can be manufactured separately from the lower frame and connected to it at a later stage of the manufacturing process.

In a preferred embodiment of the present invention, the snap connection is radially inward relative to the first seal. This actually means that the snap connection is on the inside of the container with respect to the location of the seal. In that case, this snap-fit connection passes through the lower rim, its location inside relative to the seal does not cause any damage to the seal as a whole. This arrangement allows the use of more convenient manufacturing processes, for example, in the injection molding process.

Preferably, the snap joint is a permanent joint that cannot be released without damaging the container. Alternatively, the snap-on connection may be detachable such that the top frame and cover can be removed and, for example, reused in another package. According to another preferred embodiment, the snap-fit connection comprises a plurality of downwardly extending studs on the upper frame which engage through locking holes in the lower frame.

The first and second seals according to the present invention are preferably insect-proof seals. Hereinafter, a seal impervious to insects will be defined as a seal that excludes any opening of 70 microns or more at any point of the seal. Experience in the field of food packaging in tropical climates has determined that this value is usually sufficient to avoid the penetration of the smallest insects that can adversely affect food hygiene. By ensuring the first and second seals are insect-proof, it is possible to avoid the penetration of such insects into the interior of the container, even after the container was first opened and when powder particles are present around the lid and frames. The first and second seals can also be waterproof, preferably with at least 3 cm of water.

Preferably, the first seal comprises an upwardly projecting first rim on a lower frame that engages in a downwardly extending first groove of the upper frame, preferably in an interference fit. The first rim and the first groove preferably extend continuously around the entire perimeter of the first seal. This type of seal has significant advantages over one-way packing. The bezel and groove can be easily formed to have an interference fit and insect tightness described above can be achieved without difficulty. For elements obtained by injection molding, their accuracy depends on the size of the formed element. For a groove having a size of less than 2 mm, a 3% technological tolerance can be adopted without compromising compaction. In the case of one-sided sealing, the critical element size should be equal to the total diameter of the hole. For a hole with a diameter of 10 cm, the same tolerance can give a change in size of 3 mm, which hardly guarantees an interference fit.

Preferably, the second seal also comprises a second rim protruding upward on the upper frame, which engages in a downwardly extending second groove of the cover, preferably in an interference fit. The second rim and the second groove preferably also extend continuously around the full perimeter of the second seal. This arrangement of elements also benefits from the point of view of manufacturing advantages, as indicated above, and thus, the desired insect impermeability can easily be achieved. As will be understood, the direction of the location of the rims and grooves can be interchanged without affecting the sealing function. It should be noted, however, that the use of a downward groove in this method is less convenient for garbage collection.

Most preferably, the first and / or second grooves are provided with guide structures that extend radially on both sides of the respective grooves and are spaced apart from each other at least equal to the width of the respective first and second rims. As indicated above, the technological tolerances of the injection molded components must be taken into account, and although the change in the tolerance size may be small, the deviation in the position of the groove relative to the rim can be significantly larger. The input design is designed to ensure that the rim entry into the groove is achieved easily and without damage to any of them.

The lid is intended to be opened and closed frequently during use, and for this reason, the second seal must be strong enough to withstand such use without damage, wear or otherwise impairing insect resistance. In one preferred embodiment, the input structure on the second groove comprises lead-in protrusions. They can be arranged as perpendicular buttresses for the second groove, which reinforce the second groove to counteract lateral curvature. It should be understood that the specific position of the second groove may be important when closing the lid to ensure that the second rim is inserted correctly. The mismatch in the location of these structures can lead to damage to either the second rim or the second groove, which makes subsequent closure more difficult and prevents the seal, impervious to insects. To achieve its support function, lead-in protrusions may be present around the perimeter of the second groove, preferably on both sides thereof. They can be present at intervals of less than 20 mm, preferably less than 15 mm, and in the corner sections can be even closer to each other. By providing support for the second groove, the walls of the second groove can be more flexible, thereby better adapting to the second rim. In order to fulfill its input function, the insertion protrusions may extend downward beyond the lowest portion of the second groove and be inclined or curved smoothly in the direction of this groove.

The first seal between the upper frame and the lower frame is generally intended to be assembled once, and then re-sealing is not required. However, the connection of these components can occur in an automated process immediately after the manufacture and stress relief of the respective components. For this reason, the first groove may also be provided with similar lead-in protrusions, at least at its outer perimeter. This can help in self-centering the upper frame and lower frame during assembly.

According to one embodiment of the present invention, the upper frame may have an outer peripheral skirt and the lid may have an outer surface, the outer surface and the skirt being coplanar when the lid is closed. In this sense, coplanarity should not be limited to a plane, but may also include a curved surface. As a result of this shape, the lid and the upper frame can form a smooth transition without breaking.

According to another aspect of the present invention, the upper frame has an outer peripheral skirt, and the lower frame has a peripheral surface, wherein the peripheral surface and the skirt are coplanar when the upper frame and the lower frame are connected together. As stated above, this allows a smooth transition between the upper frame and the lower frame.

The cover can be made in the form of a separate unit for the upper rim and be able to be removed from it. However, preferably, the lid is rotatably connected to the upper frame. In one embodiment, the cover may be rotatable around a hinge located radially inward from the outer perimeter of the upper frame. Previous designs used hinged designs that allow the lid to rotate relative to the rim, located radially outward from the outer perimeter of the rim. Such a design with a protruding hinge can interfere with stacking, and undesirably degrades the external contour of the finished product.

As a result of the pivoting closure of the lid, the correct engagement of the second rim in the second groove is important if simple closing should occur without damage to the second seal. The input design is important in achieving such a closure. In order to further improve the action of the downward closing mechanism, the ongoing second lid groove may have a peripheral inner wall and a peripheral outer wall, wherein the peripheral outer wall extends downward more than the peripheral inner wall in the portion adjacent to the hinge. The inner wall may thus be not uniform in height around its full perimeter and may gradually bend downward from one end of the container towards the middle of the rear side of the container. The second rim may also be free of lead-in protrusions in these areas, which may extend along the entire side of the lid where the hinge is located. In the absence of lead-in protrusions, the inner and outer walls are able to bend better when the second rim enters the second groove. When closing the lid, this is the part of the second rim that first engages with the second groove and it does this at a relatively large angle. In one embodiment, the second peripheral seal engages when the cap is at an angle of about 20 ° to the upper frame. The engagement of the second rim with the second groove continues progressively as the lid closes. This gradual engagement of the second seal and frictional contact between the inner wall and the second rim provides the user with a tactile feedback reaction of the sealing mechanism, which is quite different from latch-type seals, which provide a back reaction only at the end point of the snap engagement.

According to another preferred embodiment of the present invention, the upper frame may be made of a material having a different hardness than that of the lower frame or cover. In one embodiment, the top frame is formed from a first plastic material that is relatively softer than a second plastic material used for the other two components. Relatively harder material for the lower frame and cover may provide greater overall structural rigidity of the cover. Alternatively, the top frame may be slightly harder. Alternatively, all three components may be of varying hardness. The differences in hardness can be small and can be just enough to guarantee a good tight fit between the respective seals. Preferred materials for the lid and upper and lower frames are polypropylene (PP), polyethylene (PE) and polyethylene terephthalate (PET), or combinations thereof, although one skilled in the art may be familiar with various alternatives that could provide similar technical properties .

The lid, as well as the upper or lower frame can be provided with appropriate latches and elements for closing. They can also be equipped with a closing indicator in the form of a seal. The lower frame or upper frame can also be equipped with a scoop holder and leveling sections. They can extend inward into the access hole. It should be understood that the scoop holder may also be provided in the lid.

The invention further relates to a package comprising a lid structure as described above, applied to a container having a peripheral wall extending to the upper edge and forming a space for containing the product, a lower frame connected to the upper edge of the container. The package may have a generally square or rectangular outer profile with rounded corners. The packaging volume may be from 0.5 l to 3 l, preferably about 1.5 liters, and the access opening preferably has a minimum size of at least 70 mm, more preferably about 100 mm and an area of at least 100 cm ² .

Preferably, the package contains a membrane seal to seal the space containing the product before use. The membrane seal may comprise metal or a foil of plastic and metal, or may be a foil made of plastic only. The membrane seal is a gas tight seal. In this context, it should be understood that a gas tight seal is a seal that substantially prevents the passage of gas into or out of the container for long periods of storage. Preferably, it is an oxygen barrier seal preventing the diffusion of oxygen into a sealed container. The oxygen permeability of the seal may preferably be less than 2.0 cm ³ / m ² / day and more preferably may be less than 0.5 cm ³ / m ² / day. The membrane seal may be completely removed before use or may contain a weakened tear line defining the opening area and a tear tab. A membrane seal may be provided in various places, but most preferably, the membrane is sealed at the top edge of the container. In particular, it should be understood that thermoformed trays typically have an outwardly extending rim forming an upper edge, and the membrane can be sealed across the rim. In an alternative embodiment, the membrane may be sealed in the bottom frame to close the hole. In this case, one skilled in the art will understand that the connection between the lower frame and the upper edge of the container should be a gas tight sealed connection.

In a most preferred embodiment, the container is or comprises a thin-walled thermoformed tray with a wall thickness of less than 0.5 mm. Through the use of a thin-walled thermoformed tray, the amount of material required to form the container body is limited. In addition, the lower frame made of relatively thick plastic material provides the necessary support for the thin material of the peripheral wall, which allows efficient connection with the upper frame. In this context, relatively thin, which should be in relation to the material of the frame, is understandable to the specialist. The tray can be made to have a wall thickness sufficient to provide barrier properties and the required strength. The wall thickness may be from about 0.10 mm to 0.60 mm, preferably from 0.2 to 0.40 mm. It should be understood that the wall thickness may vary across the cross section, being usually thicker on the rim and thinnest on the side walls. The values given above for wall thickness are intended to indicate the thickness of the side walls, which, as a rule, are the location of the minimum thickness. The lower frame can be significantly thicker, measured at its smallest size and can have a thickness sufficient to guarantee a reliable mechanical connection with the upper frame. The tray may be made of any suitable material capable of being thermoformed. The most suitable material is polypropylene. However, other polymeric materials may also be used, such as polyethylene terephthalate (PET) or polyethylene (PE). Multilayer materials may also be used, subject to disposal requirements. The lower frame may be permanently connected to the upper edge of the container, preferably by welding.

Preferably, for disposal purposes, the packaging consists of the same type of material. This applies to the tray, upper and lower frame and cover. The membrane seal may be of the same material, although given that it is removed upon opening, it may also be disposed of separately.

In addition, the container may further comprise a cardboard sleeve wrapping and supporting the thermoformed tray. The cardboard sleeve can fit snugly against the tray in tight fit and can provide the necessary strength for the peripheral wall to be dimensionally stable. In other words, the thin plastic material of the peripheral wall may have insufficient strength to alone sufficiently retain the shape of the tray, for example, when stacking containers on top of each other. By combining it with a cardboard sleeve, improved strength can be achieved. Appropriate layers can be separated for disposal. The sleeve may contain cardboard from 50 to 400 g / m ² , preferably from 100 to 300 g / m ² . The sleeve may be open at the bottom, but preferably extends under the base of the tray.

According to one embodiment, the package may typically have a square or rectangular outer profile with rounded corners. The packaging volume may be from 0.5 l to 3 l, preferably about 1.5 liters, and the access opening preferably has a minimum size of at least 70 mm, more preferably about 100 mm and an area of at least 100 cm ² . The total packaging length may be from 150 mm to 250 mm, preferably about 185 mm. The width of the package can be from 100 mm to 150 mm, preferably about 120 mm. Packaging can be available in many different lengths depending on the required volume, varying from 80 to 150 mm.

The packaging, as described in particular, is suitable for containing a certain amount of a powdered, nutritious product that can be effectively sealed inside the space containing the product. Preferably, the powdered, nutritious product contains infant formula.

Preferably, a scoop is provided inside the package, and may be located above the membrane seal before use. It may also be permissible that the scoop is made as a unit with the lid structure and detaches upon first use.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and advantages of the present invention will be further explained with reference to the following drawings of a number of exemplary embodiments, in which:

Figure 1 is a partially exploded perspective view of a package according to the invention;

Figure 2 is a perspective view of the packaging of Figure 1 with the lid closed;

Figure 3 is a perspective view of the package shown in Figure 1 with the lid open;

Figure 4 is a partial cross-sectional view of the package of IV-IV in Figure 2;

Figures 5a-5c are cross-sectional views similar to Figure 4 in the process of connecting to the upper frame; and

6a-6c are cross-sectional views along VI-VI in FIG. 3 in the process of closing the lid.

DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS

Figure 1 shows a partially disassembled view of a package 1 having a cover structure 3 in accordance with a first embodiment of the present invention. The package 1 contains a container in the form of a tray 2, a sleeve 4 and a membrane seal 6, as well as a cover structure 3, which contains a lower frame 8, an upper frame 10 and a cover 12.

Tray 2 is thermoformed from a relatively thin polypropylene material and has a base 14 and a peripheral wall 16 forming a space 20 for containing the product. The peripheral wall 16 extends to the upper edge 18 having an outwardly extending rim 19. The sleeve 4 is formed of cardboard and has a wall 22 and a bottom 24. The lower frame 8 is a peripheral ring having a first sealing rim 48 protruding upwardly surrounding a similarly sized opening 26 for space 20 containing the product. Between the first rim 48 and the hole 26 are fixing holes 46, the function of which will be further explained below. The upper frame 10 also appears in the form of a ring and is provided with spikes 40 extending in the lower direction. The lower frame 8 and the upper frame 10 are also made of polypropylene, although it should be understood that other suitable materials may be used. The membrane 6 includes a tear line 28 defining a region 30 of the hole and includes a tear tab 32.

FIG. 2 shows a perspective view of the package 1 shown in FIG. 1 in an assembled state with the lid 12 closed. The latch 36 at the front edge of the lid 12 engages with the rib 38 on the upper frame 10 to keep the lid 12 closed. The cover 12 and the upper rim 10 are also made of polypropylene.

FIG. 3 shows a perspective view of the package 1 shown in FIG. 1 in an assembled state with the lid 12 open and the membrane removed to provide access to the space 20 containing the product. The scoop 42 is held in the lid 12 by means of the clamps 44 and can also be located in the scoop holder 50, made integrally with the lower frame 8. In addition, hinges 11 are visible, providing a swivel connection between the lid 12 and the upper frame 10.

Figure 4 is a perspective view in cross section along line IV-IV shown in Figure 2. As you can see, the membrane 6 is attached over the entire surface of the bead 19 of the tray 2 and pressed against the bottom frame 8, which overlaps the top of the bead 19. The bead 19, the membrane 6 and the lower frame 8 are all welded to each other to form a single relatively rigid rim structure. The upper frame 10 is mechanically engaged with the lower frame 8 through downwardly extending studs 40, which engage through the fixing holes 46 in the lower frame 8. As can be seen in this image, the sleeve 4 is tightly engaged with the peripheral wall 16 of the tray 2, extending upward to the space under side 19 to provide additional support. This allows the upper rim 10 to snap into the lower rim 8 without causing deformation or destruction of the tray 2.

According to an important aspect of the invention, the cover structure 3 is provided with two seals. The first peripheral seal is formed by the upwardly projecting first seal rim 48, which engages with the first groove 54 extending downwardly on the lower side of the upper frame 10. The second peripheral seal is formed by the upwardly projecting second seal rim 56 on the upper side of the upper frame 10, which engages with extending downward of the second groove 58 on the lower side of the cover 12. The inlet ribs 60, 62 are located on both sides of the first groove 54 and the second groove 58, respectively.

Figs. 5a-5c show cross-sections at the location shown in Fig. 4, with the upper frame 10 being connected to the lower frame 8. Fig. 4a shows the upper frame 10, which is inserted into the initial engagement with the lower frame 8. Introductory the ribs 60 of the first groove 54 are in contact with the first rim 48 projecting upward and guide it toward the first groove 54. The spike 40 has entered the fixing hole 46.

In FIG. 5b, the upper frame 10 has been pressed down onto the lower frame 8. This can be achieved by pressing the cover 12. In accordance with an important design principle, when pressing the cover 12, a force F is applied to the upper frame 10 by means of lead-in ribs 62 of the cover 12. Thus, additional pressure or deeper engagement of the second rim 56 in the second groove 58 is prevented. As the upper frame 10 is pushed down, the first rim 48 enters the first groove 54 and the spike 40 is bent in the fixing hole 46.

Fig. 5c shows the upper frame 10, fully engaged with the lower frame 8 and the spike 40, latched into the fixing hole 46. At this stage, the removal of the upper rim 10 is not possible without significant force and package failure. It should be noted that the spikes 40 protrude into the inside of the tray 2 and therefore cannot be accessed from outside the package 1. In addition, it can be noted that in the fully assembled position, the first bezel 48 does not reach the bottom in the first groove 54. This ensures that, thanks to technological tolerances, spike 40 will not have barriers to connection.

In this image, you can also see that the upper frame 10 has an outer peripheral skirt 66, and the cover 12 has an outer surface 64. The outer surface 64 and the skirt 66 are coplanar when the cover 12 is closed. In other words, both the cover 12 and the upper frame 10 have an outer surfaces that merge smoothly with each other in this position. In addition, the lower frame 8 has a peripheral surface 68 and a peripheral surface 68 and a skirt 66 are also coplanar when the upper frame 10 and the lower frame 8 are connected together, as shown in FIG. 5c.

FIGS. 6a-6c show cross-sections in the direction VI-VI shown in FIG. 3 with the lid 12 at various stages of closure on the upper frame 10. In FIG. 6a, the lid 12 is in the open position held by the hinge 11. As it can be seen that the hinge 11 is radially inward with respect to the skirt 66 of the upper frame 10. This means that when the packages 1 are stacked next to each other, the hinge 11 does not protrude outward and does not interfere with tight stacking. In addition, it is less likely for her to be accidentally hooked or torn off. It should also be noted that in this position, there are no lead-in ribs 62 supporting the second groove 58, and the inner wall 58A is longer than the outer wall 58B of the second groove 58.

6b shows the cover 12 in a partially closed position with the second rim protruding upward 56 in contact with the inner wall 58A of the second groove 58. This contact occurs when the cover 12 is still at an angle of about 20 ° with respect to the upper frame 10. The length to the bottom the inner wall 58A beyond the extent of the outer wall 58B ensures that the second rim 56 is guided into the second groove 58. In this case, the ongoing inner wall 58A acts as an input structure and for this reason, no input ribs 62 are required located on this site. In fact, the absence of lead-in ribs 62 allows the inner wall 58A to more easily bend when the angle between the cover 12 and the upper frame 10 changes. In addition, the angular engagement when closing the cover 12 prevents the second rim 56 from entering the second groove 58 in a linear fashion. The lead-in ribs 62 on the cover 12 help in the direction of this angular entrance, providing translational (gradual) engagement of the second rim 56 with the second groove 58, starting from the rear edge of the cover 12 adjacent to the hinge 11 and moving in a circle to the front edge of the cover 12 adjacent to the latch 36. In addition to assisting in the direction of the second rim 56 into the second groove 58, the insertion ribs 62 also support the second groove 58 and help maintain its position. Due to the additional support provided by the lead-in ribs 62, the structure forming the second groove 58 can be made more flexible, which allows the action of the closing mechanism to be smoother. As mentioned above, the technological tolerances for the positions of these characteristic elements are determined by the total size of the hole 26.

Fig. 6c shows the lid 12 in the closed position, with the second rim 56 protruding upwardly engaged with the second groove 58. As already described above, the second rim 56 is completely engaged with the second groove 58 and the closed position of the lid 12 is determined by the stop of the input ribs 62 with the upper frame 10 and the outer surface 64 in contact with the skirt 66.

Thus, the present invention has been described with reference to some exemplary embodiments described above. It will be appreciated that many modifications in addition to those described above can be made for the structures and methods described herein without departing from the spirit and scope of the present invention. Accordingly, although specific embodiments of the invention have been described, they are only examples and do not limit the scope of the present invention.

Claims (24)

1. The design of the lid for the container having a peripheral wall extending to the upper edge and forming a space for containing the product, while the design of the lid contains: a lower frame for connecting to the upper edge of the container, the lower frame forming an access hole providing access to the space containing the product; an upper frame that can be connected to the lower frame by means of a snap to form a first peripheral seal with it; as well as a cover configured to close the opening, wherein the cover and the upper frame interlock to form a second peripheral seal. 2. The design of the cap according to claim 1, wherein the snap-fit connection is radially inward from the first seal. 3. The cover design of claim 1 or 2, wherein the snap-on connection comprises a plurality of downwardly extending studs on the upper frame that engage through locking holes in the lower frame. 4. A cover structure according to any preceding claim, wherein the first seal comprises an upwardly projecting first rim on a lower frame that engages in a downwardly extending first groove of the upper frame. 5. The cover design according to any preceding claim, wherein the second seal comprises an upwardly projecting second rim on an upper frame that engages in a downwardly extending second groove of the cover. 6. The cover design according to claim 4 or 5, in which the first and / or second grooves are peripheral and provided with guide structures that extend radially on both sides of the respective grooves at a distance from each other at least equal to the width of the corresponding first and second rims. 7. The closure design according to any preceding claim, wherein the upper frame has an outer peripheral skirt and the closure has an outer surface, wherein the outer surface and the skirt are coplanar when the closure is closed. 8. A cover structure according to any preceding claim, wherein the upper frame has an outer peripheral skirt and the lower frame has a peripheral surface, wherein the peripheral surface and the skirt are coplanar when the upper frame and the lower frame are connected together. 9. The cover design according to any preceding claim, wherein the cover is pivotally connected to the upper frame. 10. The cover design according to claim 9, in which the cover is rotatable around a hinge located radially inward from the outer perimeter of the upper frame. 11. The closure design of claim 9 or 10, wherein the second seal begins to engage when the closure is at an angle of more than 15 ° to the upper frame. 12. The design of the cover according to any one of paragraphs. 9-11, in which the second seal comprises an upwardly extending second rim on an upper frame that engages in a downwardly extending second groove of the lid having a peripheral inner wall and a peripheral outer wall, wherein the peripheral outer wall extends downward more than the peripheral inner wall by the area adjacent to the hinge. 13. The closure design of any preceding claim, wherein the first and second seals are insect-proof seals. 14. A package comprising a lid structure according to any preceding claim and a container having a peripheral wall extending to the upper edge and forming a space for containing the product, wherein the lower frame is connected to the upper edge of the container. 15. The package of claim 14, further comprising a membrane seal for sealing the space containing the product prior to use. 16. Packaging according to claim 14 or 15, in which the container is a thin-walled thermoformed tray with a wall thickness of from 0.1 to 0.6 mm, preferably from 0.2 mm to 0.4 mm. 17. Packaging according to any one of paragraphs. 14-16, consisting of material of the same type for disposal purposes. 18. Packaging according to claim 14 or 16, in which the container comprises a cardboard sleeve wrapping and supporting a thin-walled, thermoformed tray. 19. Packaging according to any one of paragraphs. 14-18, in which the lower frame is permanently connected to the upper edge of the container, preferably by welding. 20. Packaging according to any one of paragraphs. 14-19, further comprising a powdered, nutritious product sealed in the product containment space. 21. The packaging according to claim 20, in which the powdered nutritious product contains infant formula.

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