DK3119699T3 - Packing unit with lock and method for packing products - Google Patents

Description

DESCRIPTION

[0001] The present invention relates to a packaging unit made of moulded pulp for products like eggs and similar products like kiwis and tomatoes, for example.

[0002] Egg cases, containers or cartons known in practice are generally fabricated from carton made from moulded pulp originating from paper material. Such units comprise a bottom part, provided with compartments for individual products, and a cover part that is often hingedly connected to the bottom part. Products like eggs are transported in these units and displayed on shelves in supermarkets, for example.

[0003] DE 20 2013 011 737 U1, which discloses a packaging unit according to the preamble of claim 1, and NL 7810282 disclose packaging units for eggs having a bottom part provided with compartments, and a cover part.

[0004] During the transport of the packaging units and the stacked display of packaging units, the lock that is provided to secure the cover part to the bottom part in the closed position of the packaging unit needs to be sufficiently stable. In practice, due to the forces acting on the packaging units, wear, and production tolerances etc. the lock is not always sufficiently stable, such that the cover part is not sufficiently locked to the bottom part in the closed position of the packaging unit. This may result in product damage and even product loss during transport and/or storage.

[0005] The present invention has for its object to obviate or at least reduce the above stated problems in known packaging units such as egg cases or egg cartons.

[0006] The present invention provides for this purpose a packaging unit according to claim 1.

[0007] Having a packaging unit with a bottom part and a cover part enables transport and display of products without damaging the products. This is especially relevant in case of vulnerable products like eggs. In a preferred embodiment, the cover part is hingedly connected to the bottom part on the rear side thereof. On the front side a lock is provided comprising a first locking element on the bottom part and a second locking element on the cover part.

[0008] The first locking element extends upwardly from the bottom part, thereby defining a cam structure with an at least partly downwardly facing locking plane having a length and a width. Preferably, the first locking element is hingedly connected to the bottom part and capable of some rotating movement. In case the cam is provided with a closed outer contour/surface without openings the plane corresponds to the at least partly downwardly facing locking surface of the cam.

[0009] When the packaging unit is in a closed position, the cam partly extends through an opening that is provided in the front surface of the cover part. This provides a lock capable of locking the packaging unit according to the invention to prevent unintentional opening of the packaging unit.

[0010] To further enhance the locking function and increase the stability of the lock during transport and/or storage and/or display, the second locking element, having a length and a width, extends inwardly from the front surface of the cover part over a certain length. This further improves the locking function and more specifically improves the stability of the lock over a broad range of conditions involving forces acting on the packaging unit, wear, and production tolerances.

[0011] The second locking element is preferably shaped as a lip or edge that is preferably provided at or near the bottom edge of the opening in the front surface of the cover part. The first and second locking elements are configured such that the locking elements are capable of engaging each other over the length of the locking element, more specifically the second locking element is configured such that it is capable of engaging, with its length, the first locking element in a locking state of the packaging unit. This enables an increase in the effective locking area, i.e. the surface of the first and second locking elements that may contact each other, thereby improving locking security. Preferably, the second locking element comes into contact with the at least partially downward facing locking plane of the first locking element when an upwards acting force is applied to the cover part, while it is not the intention to open the packaging unit. This improves the locking function and stability of the packaging unit.

[0012] Providing the second locking element over a certain length improves the stability of the lock. The ratio of the length of the cam and the length of the second locking element is in the range of 1.25-3 mm, preferably in the range of 1.5-2.5 mm, more preferably in the range of 1.6-2.2 mm, and most preferably the ratio is about 1.8 mm. By providing the second locking element with a length extending at least partly in the similar direction as the substantial downward facing plane of the cam over a substantial distance, an improved stability of the lock is achieved. This prevents product damage during transport, storage and display that may be caused by accidently opening the packaging unit and damaging the products inside, for example.

[0013] Preferably, the second locking element that is preferably shaped as a lip or edge, has a length of about 3.5-8 mm, more preferably, the length is about 5 mm. It is shown that providing a significant length, preferably 5 mm, for the second locking element contributes to guaranteeing a sufficient locking function when the packaging unit according to the present invention is used in practice with disturbing effects. This further improves the stability of the lock of the packaging unit, thereby reducing the risk of damaging products therein.

[0014] In a presently preferred embodiment according to the present invention, the plane of the first locking element is provided with an angle relative to the horizontal in the range of 3°-20°, preferably in the range of 5°-15°, and most preferably the angle is about 10°.

[0015] By providing the at least partly downward facing plane or surface of the first locking element in closed position of the packaging unit at an angle to the horizontal, a self-locking effect is achieved. In this embodiment the second locking element is confronted with a locking force that has a component in an inward direction of the packaging unit. This further stabilises the lock of the packaging unit.

[0016] Preferably, the second locking element is provided at an angle relative to the front surface of the cover part in the range of 20°-60°, preferably in the range of 30°-50°, and most preferably the angle is about 40°. This angle is relative to the front surface of the cover part. In a presently preferred embodiment according to the invention the first and second locking elements are arranged such that an increasing contact surface between the locking elements is achieved when an upwards directed force acts on the cover part in case of unintentional opening of the packaging unit. As an effect of such force the second locking element bends relative to the front surface of the cover part. Increasing the contact surface increases the strength of the locking function, thereby improving the stability of the lock.

[0017] In a presently preferred embodiment, both the first and the second locking elements are provided at their respective angles, and the combination of these two features further improves the stability of the lock beyond the sum of the individual effects.

[0018] In a presently preferred embodiment according to the present invention, the front surface of the cover part comprises two parts that are provided substantially above each other in vertical direction at an angle relative to each other, with a first lower part and a second part above the first part comprising the one or more openings in the front surface.

[0019] By providing parts of the front surface of the cover part of an angle to each other a visual effect is achieved, such that a consumer has a good view on the (stack of) packaging units irrespective of the position of the consumer relative to the packaging unit. Furthermore, by having a first lower part of the front surface extending in a substantial vertical direction and providing a second part above the first part with the second part comprising the opening that is provided in the front surface, the lock capability of handling forces acting under various angles on the packaging unit is improved. Preferably a slightly inwardly inclined second part of the front surface is provided such that the contribution of the front surface of the cover part to the correct functioning of the lock is improved. This effect is even further improved in combination with providing the second locking element at an angle, as mentioned before, such that especially the self-locking and/or stability effect of the locking function is enhanced.

[0020] In a further presently preferred embodiment according the present invention, the first locking element is provided with a front surface comprising an embossing.

[0021] By providing an embossing at the front surface of the first locking element that in a closed position of the packaging unit at least partly extends through the opening in the front surface of the cover part, the consumer can be provided with visual information about the egg. This visual information may relate to the contents of the packaging unit and/or indication of a location for opening the packaging unit.

[0022] In a further preferred embodiment according to the present invention, the packaging unit comprises a label that is provided on the cover part, wherein the label comprises a cut to enable the first locking element to partly extend through the opening in the front surface of the cover part.

[0023] By providing the label with a cut, incision or slit, the first locking element is capable of extending through the opening in the front surface. The cut can be shaped as an opening such that the first locking element extends through the opening in the front surface of the cover part and the label that is provided thereon. Alternatively, a groove-shaped cut, incision or slit is provided that enables the first locking element to slightly deform the label. As an optional advantageous effect, the consumer is provided with information that the lock is correctly achieved. Furthermore, this provides the consumer with a visual indication of where, and how, to open the packaging unit.

[0024] In a presently preferred embodiment the cut comprises a curved cut that is configured to enable the cam to partly extend through the opening in the cover part. More specifically, the curved cut is preferably positioned relative to the cam such that in a closed position of the packaging unit the cam defines a buckling or deflected part in the label and keeping the cam substantially behind the label as seen in a front view of the packaging unit in a closed position thereof. This further enhances the display surface and provides an additional three-dimensional effect on the label. Preferably this three-dimensional effect is further enhanced by providing the cam with an egg-shape. This is particular useful in case of packing egg-products for a visual indication to consumers of the products inside the packaging unit. Furthermore, the egg-shaped cam distributes forces over the label in all relevant directions such that the risk of the label cracking or bursting when closing the packaging unit is significantly reduced. In one of the presently preferred embodiments according to the present invention the curved cut comprises a circular shape with one curve radius. Providing a single curve radius provides a cut that is well defined and is capable of distributing forces acting on the label in all relevant directions to prevent cracking or bursting of the label. In an alternative preferred embodiment according to the present invention the curved cut comprises more than one curve radius. Providing more than one curve radius enables providing a cut with any desired length. This provides additional flexibility for the dimensions of the packaging unit.

[0025] In a presently preferred embodiment, the first locking element is formed by moulding and/or pressing and is provided with a closed surface or closed outer contour.

[0026] By designing the first locking element as a cam that is preferably provided with a nose shape, the first locking element can be formed during the manufacturing process involving moulding and/or pressing. This also enables providing the cam shaped first locking element with a closed surface or closed outer contour, i.e. substantially without openings in the contact surfaces of the lock. This improves the contact between the downward facing plane/surface of the first locking element and the second locking element.

[0027] The present invention further relates to a method for packing products like eggs, comprising the steps of providing a packaging unit as described above, and placing therein one or more of the products.

[0028] Such method provides the same effect and advantages as described with respect of the packaging unit. In fact, the method can be used with a large number of different embodiments of the packaging units according to the invention.

[0029] Further advantages, features and details of the invention are elucidated on a basis of preferred embodiments thereof, wherein reference is made to the accompanying drawings, in which: • Fig. 1 shows an embodiment of the packaging unit in an open position; • Fig. 2 shows a front view of the packaging unit of Figure 1; • Fig. 3A and B show a combination of two different embodiments in the twin pack unit; • Fig. 3C shows a front view of the packaging unit of Figure 1 in an alternative embodiment with two different embodiments in the twin pack configuration; • Fig. 3D shows a further alternative embodiment of the packaging unit according to the invention with two different embodiments in the twin pack configuration; • Fig. 4 shows a cross-section of the packaging unit of Figures 1-2; and • Fig. 5 shows a detail of the lock of Figure 4.

[0030] A packaging unit 2 (Figures 1-2) comprises a first unit 2a and a second unit 2b. Each unit comprises a bottom part 4 with a front surface 6, two side surfaces 8, a back side 10, and a bottom side 12. In the illustrated embodiment, a cover part 14 is hingedly connected with hinge 16 to bottom part 4 to allow cover part 14 to move relatively to bottom part 4 between an open and a closed position. Cover part 14 further comprises front surface 18, two side surfaces 20, a back side surface 22 and a top surface 24.

[0031] On the inside of bottom part 4 product receiving compartments 26 are provided having contours matching at least partially the outer contours of the products, like eggs, kiwis and tomatoes, for example. Support cones 28 are provided to add stability and strength to packaging unit 2.

[0032] In the illustrated embodiment, connection 32 connects the twin packages 2A, 2B. It will be understood that all features shown for the twin pack configuration 2 can also be used in other configurations, including more conventional packaging units including a unit comprising 6, 10, 12 or any other number of compartments for receiving products like eggs.

[0033] Several alternative embodiments of a packaging unit can be envisaged (Figure 3Aand B), including a packaging unit 34 that is provided with a label 36 wherein label 36 comprises cut 38. Lock 30 may extend through cut 38 and/or push part of label 36 slightly forward when packaging unit 34 is in a closed position. It will be understood that several shapes of cut 38 can be applied, including the groove-shaped cut in a substantially horizontal direction as illustrated in Figure 3A, as well as U-shaped cuts that enable part of label 36 to slightly be pushed upwards by lock 30 when packaging unit 34 is in a closed position.

[0034] A further alternative embodiment for packaging unit 40 comprises label 42 wherein an opening 44 (Figure 3A) is provided. For illustrative purposes alternative units 34, 40 are shown in one twin pack. In alternative unit 40 front surface of lock 30 is provided with an embossment 46. The shape of embossment 46 can be related to the product provided inside packaging unit 40, such as an egg-shape, or provide further information to the consumer, such as where to open packaging unit 40. Alternative embodiments 134, 140 (Figure 3 B) with lock 130 comprise labels 136, 142 with a ^shaped cut 138 and a +-shaped cut 138, respectively. It will be understood that other shapes are also possible including U-, V-, Δ-, and 0-shaped cuts. In the illustrated embodiments cut 138 is embodied as an incision. Alternatively, cut 138 can be provided as a cut-away with some label material being removed.

[0035] Alternative packaging unit 202 (Figure 3 C) is illustrated in a twin pack-configuration. For illustrative purposes alternative units 234, 240 are shown in one twin pack 202. Unit 234 is provided with label 236, wherein label 236 comprises cut 238. Cam 231 of lock 230 may extend through cut 238 and/or push part of label 236 slightly forward in area 240 when packaging unit 234 is in a closed position. In the illustrated embodiment area 40 will typically have an egg-shape corresponding with the shape of cam 231. In the illustrated embodiment cut 238 comprises a single radius R1, extending in height over distance y1 and in width direction over distance d 1. It will be understood that several shapes of cut 238 can be applied. Unit 242 is provided with label 244 comprising alternative cut 246 with at least two different radii R2a and R2b, extending over distances y2 and d2 defining area 247.

[0036] A further alternative embodiment for packaging unit 248 comprises label 250, wherein cut 252 is provided (Figure 3 D) that extends over distances y3 and d3. Cut 252 is on both ends provided with cross-cuts 254. Cross-cuts 254 enlarge area 256 by increasing distance y3 enabling further buckling or deflection of label 250 caused by cam 231. Unit 258 comprises label 260 with cut 262 having at least two radii R4a and R4b, and cross-cuts 264. Distances y4 and d4 define area 266. For illustrative purposes alternative units 248, 258 are shown in one twin pack.

[0037] Lock 30 (Figures 4-5) comprise a nose-shaped cam 48 acting as first locking element. Cam 48 is provided on flap 50 that is hingedly connected by connection 52 to bottom part 4 of packaging unit 2. In the illustrated embodiment, connection 52 is capable of a slightly rotating movement A. In the illustrated embodiment, cam 48 defines a closed outer surface or outer contour defining a chamber 54. The substantially downward facing surface 56 of cam 48 is in the illustrated embodiment a substantially closed surface without openings. In the closed position of packaging unit 2, cam 48 partly extends through opening 58 that is provided in the front surface 18 of cover part 14. The upper edge 60 of opening 58 is provided at a small angle and is slightly pushed inwards.

[0038] Front surface 18 of cover part 18 is provided with lower part 62 that in the closed position of packaging unit 2 extends substantially vertical. In the illustrated embodiment, a second part 64 is provided directly above first part 62 at an inwards inclined angle β relative to vertical 70. The upper edge of second part 64 defines the lower edge 66 of opening 58 and acts as second locking element. Edge or lip 66 of this second locking element extends over a distance D1 and is provided at an angle a relative to the second part 64 of front surface 18. Furthermore, in the illustrated embodiment, surface 56 of cam 48 is provided at an angle γ relative to horizontal 68. Surface 56 extends substantially inward over a length D2. In the illustrated embodiment, length D2 is about two times the length D1 of lip 66. In the illustrated embodiment a is about 30°, β is about 5° and γ is about 12°. Distance D1 is about 5 mm and distance D2 is about 9 to 10 mm. It will be understood that other configurations and dimensions will also be possible in accordance with the present invention.

[0039] It will be understood that in a presently preferred embodiment, lip 66 is provided at a somewhat larger angle relative to horizontal 68 as compared to surface 56. When unintentionally lifting cover part 14, lip 66 will contact surface 56 and the contact surface between the two locking elements 48, 66 will increase with an increasing upwards directed force. This improves the stability of lock 30.

[0040] When packing products like eggs, the products are placed in compartments 28. In the illustrated embodiment, when cover part 14 is closed lock 30 with locking elements 48, 66 locks packaging unit 2a, 2b. In the illustrated embodiment, in such closed position cam 48 partly extends and protrudes through opening 58 of front surface 18 of cover part 14. When opening packaging unit 2a, 2b cam 48 is slightly pushed inwards, such that lip 66 can move upwardly. The length D1 of lip 66 relative to the length D2 of surface 56 provides a stable lock 30 in case of forces applying in an upward direction on cover 18 when it is not the intention to open packaging unit 2a, 2b.

[0041] When manufacturing packaging unit 2a, 2b, in the illustrated embodiment, a chamber 54 is provided by moulding and/or pressing such that plane 56 preferably provides a closed surface. It will be understood that other alternative configurations are also possible in accordance with the invention.

[0042] The present invention is by no means limited by the above described preferred embodiments thereof. The rights sought are defined by the following claims within the scope of which many modifications can be envisaged.

REFERENCES CITED IN THE DESCRIPTION

This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description • DE202013011737U1 Γ00031 • NL7810282 [Q0Q31

Claims (12)

A packing unit (2, 34, 40, 202, 248) made of molded pulp for products such as eggs, the packing unit comprising: - a bottom portion (4) provided with compartments (28) for the individual products, - a cover portion (14) comprising a top portion, a front portion (18) and rear surfaces, the surface of the front portion having one or more apertures (58), - a first locking member extending upwardly from the bottom portion and defining a comb member ( 48) which, when the package unit is in the closed state, extends through one or more apertures, said cam means having at least partially downward locking surface (56), said locking surface having a length (D2) and a width such that the length the cam member may extend partially through an aperture in the front portion surface of the lid portion when the package assembly is in the closed position; and - another locking member formed as a lip or edge (66) having a length (D1) and a width which at least partially extends inward from the front of the lid lengthwise so that the first and second locking means define a lock (30) in the packing unit and wherein the second locking means can touch the first locking means over its length when the packing unit is in the locked state, characterized in that the relationship between the length of the cam means and the length of the second locking means are in the range of 1.25 - 3. A package unit according to claim 1, wherein the ratio is in the range of 1.5-2.5, preferably 1.6-2.2, most preferably of approx. 1.8. Package unit according to claim 1 or 2, wherein the second locking means has a length of approx. 3.5-8 mm, preferably approx. 5 mm. The package unit of claim 1, 2 or 3, wherein the first locking member substantially downwardly directed forms an angle (γ) with a horizontal plane (68) in the range of 3 ° -20 °, preferably in the range of 5 ° -15 °, and most preferred at approx. 10 °. Packing unit according to one or more of the preceding claims, wherein the second locking means forms an angle (a) with the front face (18) of the lid part, which angle is in the range 20 ° -60 °, preferably in the range 30 ° -50. °, and most preferably at approx. 40 °. Packing unit according to claim 5, wherein the first and second locking means are arranged so that a contact surface between the first and second locking means will be increased when an increased force is applied upwards on the lid part without opening the packing unit. A packing unit according to one or more of the preceding claims, wherein the front face (18) of the cover portion comprises two parts (62, 64) which are arranged substantially above one another in a vertical direction, but forming an angle relative to each other. said first lower portion (62) and said second lower portion (64) disposed above said first portion having one or more openings in said front face. Packing unit according to one or more of the preceding claims, wherein the locking means having a front face comprises an elevation (46). Package unit according to one or more of the preceding claims, further comprising a label (36, 42, 136, 142, 236, 244, 250, 260) disposed on the lid portion and the label comprising a section (38 , 138, 238, 246, 252, 262) which allows the locking member to extend partially through the opening. A packing unit according to claim 9, wherein the section comprises a curved section (238, 246, 252, 262) which is designed to partially permit the cam member to be able to penetrate through the opening in the cover portion. Packing unit according to one or more of the preceding claims, wherein the locking means is formed by molding and / or pressing and is provided with a closed outer surface. A method of packaging products such as eggs, comprising the step of providing a packaging unit (2, 34, 40, 202, 248) according to one or more of claims 1 to 11, and placing one or more in the packaging unit. several of the products.