WO2009096894A1

WO2009096894A1 - Blister pack

Info

Publication number: WO2009096894A1
Application number: PCT/SE2009/050102
Authority: WO
Inventors: Johan BERGSTRÖM; Peter Pinzke
Original assignee: Transformer Ab
Priority date: 2008-01-31
Filing date: 2009-01-30
Publication date: 2009-08-06
Also published as: SE533499C2; SE0800243L

Abstract

The present invention relates to a blister pack (10) comprising a first portion (14) and a second portion (15), wherein at least the first portion (14) comprises at least one closed cavity containing a product. The blister pack (10) is provided with a first fold line (16) arranged between the first portion (14) and the second portion (15) and along which the blister pack (10) is foldable between an open position and a closed position, and a fastener (20) for cooperation with a fastening means (21) of the first portion (14) so that the second portion (15) is detachably connectable with the first portion (14) in the closed position. The second portion (15) is connected to a flap (19) provided with the fastener (20) through a second fold line (18), wherein the flap (19) with the fastener (20), in the closed position of the blister pack (10), is foldable over a free end (17) of the portion (14) for cooperation with the fastening means (21).

Description

BLISTER PACK

FIELD OF THE INVENTION

The present invention relates to a blister pack for storing one or more products. More specifically the present invention relates to a blister pack having a first layer with at least one cavity with an open side formed therein for receiving a product and a second layer connected to the first layer and closing the open side of the cavity, wherein the second layer can be removed or broken to remove the product from the pack.

Blister packs are commonly used within the pharmaceutical industry for packaging tablets and capsules and are also used for packaging, for example, throat lozenges and similar within the food industry, wherein the second layer usually is a foil through which the tablets can be pushed out. Blister packs are also used for packaging a plurality of different types of products, such as batteries, toys, household utensils and similar, wherein the second layer usually is a cardboard which is removed or broken when the product is removed from the pack.

PRIOR ART

A plurality of different types of blister packs are disclosed in the prior art. One such blister pack is for example disclosed in US5549204. The blister pack disclosed in US5549204 comprises a first layer having cavities formed therein for tablets, a foil covering the openings of the cavities and a fold line, so that the blister pack can be folded foil against foil to protect the foil. The blister pack according to US5549204 further comprises a fastener, so that it can be detachably fastened in the folded position.

One drawback with such prior art blister packs is that the fastening in the folded position according to some embodiments can be unreliable and can disengage fairly easy, wherein the content can be damaged. It should also be possible to make such embodiments more childproof. One problem with such prior art blister packs is that the flexibility is fairly low. Another type of blister pack is disclosed in WO03010065. The blister pack disclosed in WO03010065 comprises a fold line so that it is foldable foil against foil, and a fastening device for detachably fasten the blister pack in the folded position. The fastening device can be opened by means of a pointed object to make it childproof.

One problem with such prior art blister packs is that a tool such as the pointed object is required to open the blister pack.

BRIEF DESCRIPTION OF THE INVENTION

An object of the present invention is to overcome the above-mentioned drawbacks and problems of the prior art. The blister pack according to the invention results in a safe locking or connection in the folded position while allowing simple and cost efficient manufacture. The invention also makes it possible to handle and store tablets and similar in a more reliable and convenient manner while a favourable flexibility and child safety can be provided.

The present invention relates to a blister pack comprising a first portion and a second portion, wherein at least the first portion comprises a first layer having at least one cavity with an open side formed therein for receiving a product, a second layer connected to the first layer and closing the open side of the cavity, wherein said blister pack is provided with a fold line arranged between the first portion and the second portion and along which the blister pack is foldable between an open position and a closed position so that the second portion engages the second layer of the first portion in the closed po- sition, and a fastener for cooperation with a fastening means of the first portion so that the second portion is detachably connectable with the first portion in the closed position, characterised in that the fold line between the first portion and the second portion is a first fold line, and that the second portion is connected to a flap provided with the fastener through a second fold line, wherein the flap with the fastener, in the closed position of the blister pack, is foldable over a free end of the first portion for cooperation with the fastening means. Consequently the blister pack can be folded to a closed position and be locked in the closed position in a safe manner. Further, the blister pack according to the invention can be arranged so that it easily can be opened and closed again.

The fastening means can project substantially in the same direction as the cavity, wherein the fastener can be arranged as a protrusion projecting substantially in parallel with the cavity. Further, the fastening means can be formed with a notch for receiving the fastener or with a wider top to provide a safer locking. For example, the protrusion is formed with a wider top and a thinner base, so that the outer portion of the flap must be forced over the wider top of the protrusion to be received in the thinner base of the protrusion between the protrusion and the cavity.

The fastener can be formed as an aperture, such as a through aperture or a blister formed in the first layer or similar, for receiving the fastening means. The fastener and the fastening means are arranged with cooperating shapes. The shape can vary, wherein the fastener and the fastening means can be formed as a rectangle, circle, polygon, ellipse, etc. Hence, the aperture can be punched or formed on the same side of the blister pack as the cavity and the protrusion, which results in a more simple and cost efficient manufacturing process. For example, the aperture is arranged in the first layer like the cavity and the protrusion. The first portion can be provided with a first thinner part with the fastening means, and the second portion can be provided with a second thinner part substantially corresponding to the first thinner part and connecting to the flap, so that the flap with the fastener is arranged wider than the first and second thinner parts, wherein the flap, when the fastener cooperates with the fastening means, projects beyond the thinner parts to form a grip part. By means of the projecting grip part a person can grip the flap more easily when unlocking the blister pack. Alternatively, the flap can be formed thinner than the first portion or the thinner part of the first portion, wherein opening of the blister pack is made more difficult. The first portion, the second portion and the flap form a set, and the blister pack can comprise a plurality of sets interconnected through tear lines. For example, the first portion and the second portion both comprise a cavity, wherein one set includes two products, such as two tablets. For example, the blister pack is arranged as a so called blister card or blister strip having a plurality of sets. One set can be removed from the remaining sets or from the blister card, wherein separate sets can be brought along, opened and closed again. Consequently, a fairly small, convenient and neat pack is provided which a person can bring along. Simultaneously the pack is durable and safely closed in its closed and locked position. For a blister pack having a plurality of sets, the flap of each set is operable separately, which results in that the blister pack in its folded or locked position not can be opened unless all sets are unlocked. Hence, the fastener of each set must be released from the fastening means of each set to open the blister pack. This results in a very safe structure. Further, individually operable flaps of a blister pack having a plurality of sets results in that the difficulty for opening is related to the number of doses or tablets in the blister pack, as one fastener then must be released for every additional set. Instead it is recommended that a set is removed or torn off, wherein it is unlocked and opened. Hence, a blister pack being both safe and fairly easy for an adult to open is provided.

When the blister pack is provided with the thinner parts a space is formed between the thinner parts of adjacent sets. For example, the flap pro- jects into the space when the blister pack is closed and locked, wherein the flap projects substantially in parallel with the first fold line. For example, the flap is terminated at the free end, so that the flap does not project beyond it. The thinner parts are suitably arranged so that a person can grip the flap in the space to unlock and open the blister pack. The blister pack can also be arranged with an opening having concave sides in the intersection between the first fold line and the tear line, so that rounded corners of separate sets is obtained when removed from remaining sets of the blister pack. Consequently, a separate set, when removed from remaining sets of a blister pack, forms a small and neat pack being easy to bring along and to store. Further characteristics and advantages of the present invention will become apparent from the description of the embodiments below, the appended drawings and the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in more detail by means of embodiment examples and with reference to the enclosed drawings, on which:

Fig. 1 is a schematic view of a blister pack having a fastener according to one embodiment of the present invention, showing the blister pack in an open position,

Fig. 2 is a schematic side view of the blister pack according to Fig. 1 ,

Fig. 3-6 is a set of schematic side views of the blister pack according to Fig. 1 , showing the folding of the blister pack to a closed position and connection of the fastener to a locked position,

Fig. 7 is a schematic view from above of a blister pack having a fastener according to one alternative embodiment of the present invention,

Fig. 8-10 is a set of schematic side views of the blister pack of Fig. 7, showing the folding and connection thereof,

Fig. 11 is a schematic view from above of a blister pack having a fastener according to another alternative embodiment of the present invention,

Fig. 12 is a schematic side view of the blister pack according to Fig. 11 in the open position,

Fig. 13 is a schematic side view of the blister pack according to Fig. 11 in the closed and locked position, Fig. 14 is a schematic view from above of the blister pack of Fig. 11 in the closed and locked position,

Fig. 15 is a schematic view from above of a blister pack having a fastener according to another alternative embodiment of the present invention, showing the blister pack in the open position,

Fig. 16 is a schematic view from above of the blister pack of Fig. 15 in the closed and locked position,

Fig. 17 is a schematic side view of a blister pack having a fastener according to another alternative embodiment of the invention,

Fig. 18 is a schematic side view of a blister pack having a fastener according to another alternative embodiment of the invention,

Fig. 19 is a schematic side view of a blister pack having a fastener according to another alternative embodiment of the invention, and

Fig. 20 is a schematic side view of the blister pack according to Fig. 19, showing the blister pack in the closed and locked position.

THE INVENTION

With reference to Fig. 1 and Fig. 2 a blister pack 10 is illustrated schematically according to one embodiment of the present invention. In the embodiments illustrated in the drawings the blister pack 10 is arranged for storing a plurality of products, such as tablets or capsules. Alternatively the blister pack 10 is arranged for storing one single product. The blister pack 10 comprises a first layer 11 having at least one cavity

12 with an open side formed therein for receiving one or more products. For example, the cavity 12 is arranged for receiving one single product. In the embodiment shown in the drawings the blister pack is provided with a plural- ity of cavities 12. The first layer 11 is, for example, formed in a plastic material, such as PVC (polyvinyl chloride), PP (polypropylene) or similar, wherein the cavities 12 are formed therein in a conventional manner. The first layer is connected to a second layer 13 sealing the open side of the cavities 12, wherein the second layer 13 covers the open side of the cavities 12 in a conventional manner. The second layer 13 is, for example, formed as a foil of a suitable material, such as aluminum or plastic, wherein the products can be pushed out through the second layer 13 or wherein the second layer 13 can be removed to remove the products from the blister pack 10. Alternatively, the second layer 13 is formed in a paper based material.

The blister pack 10 is arranged with a first portion 14 and a second portion 15 and a first fold line 16 between the first portion 14 and the second portion 15, along which the blister pack 10 is foldable between an open position and a folded or closed position, so that the second portion 15, in the closed position, engages the second layer 13 of the first portion 14. The folding is described in more detail below. The first portion 14 comprises a first cavity 12a for a first product and the second portion 15 comprises a second cavity 12b for a second product. Alternatively, the second portion 15 is plane. The first portion 14 is formed with a free end 17 in a side opposite the first fold line 16, wherein one side of the first portion 14 is connected to the second portion 15 through the first fold line 16, and the opposite side is terminated with the free end 17. The free end 17, or a portion thereof, extends for example substantially in parallel with the first fold line 16. Alternatively, the free end 17 is inclined with reference to the first fold line 16. The blister pack 10 further comprises a flap 19 connected to the second portion 15 through a second fold line 18, the flap 19 being foldable along the second fold line 18. The flap 19 is connected to a side of the second portion 15 opposite the first fold line 16, wherein the second portion 15 is arranged between the first portion 14 and the flap 19. For example, the second fold line 18 extends in parallel with or substantially in parallel with the first fold line 16. Alternatively, the second fold line 18 is inclined with reference to the first fold line 16, which is not illustrated in the drawings, wherein the second portion 15 is substantially triangular, so that the flap 19 is foldable over a free side of the first portion 14 being arranged adjacent and at an angle to the free end 17.

The flap 19 comprises or is provided with a fastener 20 for cooperation with a fastening means 21 of the first portion 14, wherein the fastener 20 is detachably connectable with the fastening means 21 for locking the flap 19 to the first portion 14, which is described in more detail below. The fold lines 16, 18 and the fastener 20 are indicated in the side views of Fig. 2-6 for clarity.

With reference to Fig. 2-6 folding and locking of the blister pack 10 in the closed position is illustrated according to one embodiment of the inven- tion. In Fig. 2 the blister pack 10 is illustrated in its unfolded open position, in which the second portion 15 not is arranged in contact with the second layer

13 of the first portion 14, so that the products in the cavities 12a, 12b can be brought out through the second layer 13 or so that the second layer 13 can be removed. For example, the first portion 14, the second portion 15 and the flap 19 are aligned and extend substantially in a common plane in the open position. The blister pack 10 is foldable along the first fold line 16 as illustrated by means of the arrow A in Fig. 3, wherein the second portion 15, carrying the flap 19, is foldable along the first fold line 16 in a direction towards the first portion 15 until the second layer 13 of the second portion 13 or a back of the second portion 15 engages the second layer 13 of the first portion

14 and the blister pack is in its folded or closed position as illustrated in Fig. 4. In Fig. 4 the blister pack 10 is shown in its closed but unlocked position. Hence, in the closed position the second portion 15 engages the second layer 13 of the first portion 14 for reinforcement or blocking of the second layer 13 to prevent products from leaving the blister pack 10. According to the illustrated embodiment the second layer 13 of the second portion 15 engages the second layer 13 of the first portion 14 in the closed position. Hence, the blister pack 10 is foldable so that the foil of the second portion 15 engages the foil of the first portion 14, so that the risk of unintentional or un- desired rupture of the foil is reduced. In the illustrated embodiment the blister pack 10 is arranged so that the first cavity 12a is arranged opposite to the second cavity 12b in the closed position. Alternatively, the cavities 12a, 12b are displaced in relation to each other in the closed position. In the closed position the second portion 15 extends so that the second fold line 18 is arranged at the free end 17 of the first portion 14 or so that the second fold line 18 is arranged beyond the free end 17, wherein the flap 19 is foldable over the free end 17, as illustrated in Fig. 5 and Fig. 6. Hence, the flap 19 with the fastener 20 is foldable along the second fold line 18, as illustrated by means of the arrow B in Fig. 5, so that the flap 19 engages a top side of the first portion 14 or the first layer 11 of the first portion 14.

In the embodiment of Fig. 1-6 the fastener 20 is formed as a through aperture 22 in the flap 19, which through aperture is arranged for cooperation with the first cavity 12a of the first portion 14, wherein the first cavity 12a forms the fastening means 21. Alternatively, the fastener 20 is formed as a concavity corresponding to the first cavity 12a for cooperation therewith. Hence, the flap 19 is foldable over the free end 17 of the first portion 14, so that the through aperture 22 can be brought over the first cavity 12a for de- tachable connection therewith, as illustrated by means of the arrow C in Fig. 6. Hence, the blister pack 10 is illustrated in its locked position in Fig. 6. To unlock the blister pack 10 the flap 19 is disengaged from the first cavity 12a, wherein the blister pack 10 can be opened and brought to its open position, so that the products can be released. As disclosed in Fig. 1 the blister pack 10 comprises a plurality of sets

23 of the first portion 14, the second portion 15 and the flap 19, which are interconnected forming a blister card. Hence, a first set 23a is connected to a second set 23b through a tear line 24, such as a perforation or similar, wherein the first set 23a can be removed from the second set 23b. Hence, the tear line 24 extends in a direction across the first fold line 16 and the second fold line 18 and for example perpendicular thereto. For example, the tear line 24 extends between the first portion 14 of the first set 23a and the first portion 14 of the second set 23b, wherein the second portion 15 of the first set 23a and the second portion 15 of the second set 23b are foldable inde- pendent of each other. Alternatively, the tear line 24 extends between the second portion 15 of the first set 23a and the second portion 15 of the second set 23b, wherein the first portion 14 of the first set 23a and the first portion 14 of the second set 23b are foldable independent of each other. For example, a set 23 comprises the two cavities 12a, 12b, wherein a set 23, for example, comprises two tablets, which is a common dose for common painkillers and similar.

With reference to Fig. 7-10 the blister pack 10 according to one alter- native embodiment of the present invention is illustrated. The embodiment of Fig. 7 is generally arranged similar to the embodiment of Fig. 1-6 except from the fastener 20 and the fastening means 21. The fastener 20 is formed as an aperture 25, such as a through aperture or a recess for cooperation with the fastening means 21 in the form of a protrusion 26 corresponding to the aper- ture 25, which is evident from Fig. 8-10.

The folding and locking of the blister pack 10 according to the embodiment of Fig. 7 are illustrated in Fig. 8-10. The second portion 15 is fold- able along the first fold line 16 in a direction illustrated by means of the arrow D in Fig. 8, wherein the blister pack 10 is foldable to its closed position, which is illustrated in Fig. 9, in which the second layer 13 of the second portion 15 engages the second layer 13 of the first portion 14 to prevent products from leaving the cavities 12a, 12b through the second layer 13. In the closed position the flap 19 is foldable along the second fold line 18, in a direction illustrated by means of the arrow E, over the free end 17 of the first portion 14 to the locked position in Fig. 10. Hence, the aperture 25 is brought over the protrusion 26 to connect the flap 19 in the position in which it is folded over the free end 17, so that the blister pack 10 is kept in its closed position. The protrusion 26 projects in the same direction as the first cavity 12a and is, for example, formed in the first layer 11. Hence, the protrusion 26 projects from a side of the blister pack 10 opposite the second layer 13 or from its top side. The protrusion 26 is arranged between the first cavity 12a and the free end 17 forming a gap 27 between the protrusion 26 and the first cavity 12a. The gap 27 is arranged for receiving a grip portion 28 of the flap 19. The grip portion 28 is arranged at the free end of the flap 19 and is arranged to facilitate locking and unlocking of the blister pack 10, i.e. when the fastener 20 is to be engaged with and disengaged from the fastening means 21 or when the aperture 25 is to be brought over the protrusion 26 as in the illustrated embodiment. Hence, the grip portion 28 is arranged to be gripped by the fingers of a person when operating the flap 19, particularly during unlocking thereof. The aperture 25 and the protrusion can be arranged with a plurality of different shapes. For example, the aperture 25 and the protrusion 26 are elongated and extend substantially in parallel with the fold lines 16, 18. Alternatively, the aperture 25 and the protrusion 26 are circular, elliptic, rectangular, formed as cooperating polygons, etc.

In the illustrated embodiment each of the sets 23 of the blister pack 10 is arranged with a fastener 20 and a fastening means 21 cooperating with the fastener 20, wherein the fasteners 20 of a plurality of sets 23 arranged in se- ries must be disengaged from their fastening means 21 to enable opening of a closed and locked blister card. Hence, a blister card comprises a plurality of sets 23 having locking mechanisms being independent of each other. Hence, the flap 19 of the first set 23a is arranged independent of the flap 19 of the adjacent second set 23b. To facilitate unlocking it is recommended that the first set 23a is removed from the second set 23b, wherein unlocking can be done by a person gripping the grip portion 28 and disengaging the fastener 20 from the fastening means 21 cooperating therewith.

With reference to Fig. 11-14 a blister pack 10 according to another alternative embodiment of the present invention is illustrated. In the embodi- ment of Fig. 11 the fastener 20 is formed as the aperture 25 and the fastening means 21 is formed as the protrusion 26 but with another shape than the embodiment of Fig. 7-10. In the embodiment of Fig. 11 the aperture 25 and the protrusion 26 are quadratic having rounded corners instead of being elongated as illustrated in Fig. 7. As mentioned above the aperture 25 and the protrusion 26 can be provided with another shape, such as circular, poly- gonic, elliptic, rectangular, etc. Similar as in Fig. 7 the blister pack 10 of Fig. 11 is foldable from an open position, as illustrated in Fig. 12, to a closed and locked position, as illustrated in Fig. 13. Hence, the second portion 15 is fold- able along the first fold line 16, so that the second layer 13 of the second por- tion 15 engages the second layer 13 of the first portion 14. Further, the flap 19 is foldable along the second fold line and over the free end 17 of the first portion 14, so that the aperture 25 can cooperate with the protrusion projecting in the same direction as the cavities 12a, 12b. In the embodiment of Fig. 11 the first portion 14 is arranged with a first thinner part 29 with the fastening means 21 in the form of the protrusion 26. Hence, the first thinner part 29 is arranged in the outer part of the first portion 14 and comprises the free end 17. The protrusion 26 is arranged on the thin- ner part 29, wherein the protrusion 26 projects perpendicular to the extension of the thinner part 29. The second portion 15 is arranged with a second thinner part 30 substantially corresponding to the first thinner part 29, which second thinner part 30 is connected to the flap 19 through the second fold line 18. The flap 19 is arranged wider than the first thinner part 29 and the second thinner part 30, so that the flap 19, in the locked position as illustrated in Fig. 14, projects beyond the thinner parts 29, 30 forming a grip part 31 to facilitate for a person to unlock the blister pack 10. The thinner parts 29, 30 are illustrated by means of dashed lines in Fig. 14. Hence, the flap 19 projects beyond the thinner parts 29, 30 in a direction substantially in parallel with the fold lines 16, 18. The aperture 25 and the protrusion 26 of each set 23 are locked and unlocked separately and independent of each other. The thinner parts 29, 30 of adjacent sets 23 form a space 32 between them. Hence, the grip part 31 of the second set 23b projects into the space 32 between the thinner parts 29, 30 of the first set 23a. To release products from such blister card the first set 23a is suitably removed from the blister card, wherein a person by means of the grip part 31 unfold the flap 19 of the first set 23a, so that the protrusion 26 is disengaged from the aperture 25. When the blister pack 10 has been unlocked the second portion 15 is unfolded, so that the blister pack 10 is brought to its open position, wherein the products can be pushed out through the second layer 13.

As disclosed in Fig. 11 the blister pack 10 according to the illustrated embodiment is arranged with openings 33 to provide rounded corners of the first set 23a when removed from the second set 23b. The effect of the openings 33 is evident from Fig. 14, from which drawing it is evident that a set 23 is provided with rounded corners in the closed position. The openings 33 are arranged at the first fold line 16 and at the tear lines 24 between each set 23. The openings 33 are, for example, quadratic having concave sides. By this, pointed corners of separate sets 23 are avoided. With reference to Fig. 15 and Fig. 16 the blister pack 10 is illustrated according to another alternative embodiment of the present invention, wherein the blister pack 10 is in its open position in Fig. 15 and in its closed and locked position in Fig. 16. In the embodiment of Fig. 15 and Fig. 16 the fastener 20 is formed as the aperture 25 and the fastening means 21 is formed as the protrusion 26 similar to the embodiment of Fig. 11.

In the embodiment of Fig. 15 and Fig. 16 the first portion 14 is formed with the first thinner portion 29 projecting centrally, wherein the protrusion 26 and the free end 17 are arranged substantially in the middle of the outer part of the first portion. The second thinner portion 30 is formed in a corresponding manner, wherein the flap 19 is foldable over the free end 17, so that the aperture 25 can cooperate with the protrusion 26. The first thinner portion 29 is illustrated by means of dashed lines in Fig. 16.

With reference to Fig. 17 the blister pack 10 according to another em- bodiment of the present invention is illustrated, wherein the aperture 25 is formed as a blister 34 corresponding to the protrusion 26 for detachable connection therewith. Hence, the blister 34 projects in the same direction as the protrusion 26. For example, the blister 34 and the protrusion 26 are formed in the first layer 11 , wherein the aperture 25 formed by the blister 34 and the protrusion 26 are formed in the same side of the first layer 11 , which facilitates manufacture of the blister pack 10 compared to forming blisters in both sides of the first layer according to prior art. Also when the aperture 25 is formed as a through aperture the aperture 25 can be formed or punched from the same side of the first layer 11 as the protrusion 26. With reference to Fig. 18 the blister pack 10 according to another alternative embodiment of the present invention is illustrated, wherein the protrusion 26 is formed with a wider top 35, over which the aperture 25 can be brought to provide a stronger locking. In the embodiment of Fig. 18 the aperture 25 is arranged to be forced over the wider top 35 of the protrusion 26, wherein the grip portion 28 is received in the thinner base 36 of the protrusion 26 between the protrusion 26 and the first cavity 12a. Alternatively, the protrusion 26 is formed with a recess towards the first cavity 12a for receiving the grip portion 28 of the flap 19.

With reference to Fig. 19 the blister pack 10 according to another alternative embodiment of the present invention is illustrated, wherein the protrusion 26 is formed with a notch 37 towards the free end 17 and in a direction away from the first cavity 12a. The notch 37 is arranged for receiving the outermost part of the flap 19 for locking thereof, as illustrated in Fig. 20, wherein the outermost part of the flap 19 forms the fastener 20.

Claims

1. A blister pack (10) comprising a first portion (14) and a second portion

(15), wherein at least the first portion (14) comprises a first layer (11 ) having at least one cavity (12) with an open side formed therein for receiving a product, a second layer (13) connected to the first layer (11) and closing the open side of the cavity (12), wherein said blister pack (10) is provided with a fold line (16) arranged between the first portion (14) and the second portion (15) and along which the blister pack (10) is foldable between an open position and a closed position so that the second portion (15) engages the second layer (13) of the first portion (14) in the closed position, and a fastener (20, 25) for cooperation with a fastening means (21 , 26) of the first portion (14) so that the second portion (15) is detachably connectable with the first portion (14) in the closed position, characterised in that the fold line (16) between the first portion (14) and the second portion

(15) is a first fold line (16), and that the second portion (15) is connected to a flap (19) provided with the fastener (20, 25) through a second fold line (18), wherein the flap (19) with the fastener (20, 25), in the closed position of the blister pack (10), is foldable over a free end (17) of the first portion (14) for cooperation with the fastening means (21 , 26).

2. A blister pack according to claim 1, characterised in that the fastening means (21 , 26) projects substantially in the same direction as the cav- ity (12).

3. A blister pack according to claim 2, characterised in that the fastening means (21 , 26) is formed with a notch (37) for receiving the fastener (20).

4. A blister pack according to any of the preceding claims, characterised in that the fastener (20) is formed as an aperture (25) for receiving the fastening means (21 , 26).

5. A blister pack according to claim 4, characterised in that the fastener (20) is formed as a through aperture (25) for receiving the fastening means (21, 26).

6. A blister pack according to any of the preceding claims, characterised in that the first portion (14) is provided with a first thinner part (29) with the fastening means (21), that the second portion (15) is provided with a second thinner part (30) substantially corresponding to the first thinner part (29) and connecting to the flap (19), and that the flap (19) with the fastener (20) is arranged wider than the first and second thinner parts (29, 30), so that the flap (19), when the fastener (20) cooperates with the fastening means (21 ), projects beyond the thinner parts (29, 30) to form a grip part (31).

7. A blister pack according to claim 6, characterised in that the flap (19) projects substantially in parallel with the first fold line (16).

8. A blister pack according to any of the preceding claims, characterised in that the first portion (14), the second portion (15) and the flap (19) form a set (23), that the blister pack (10) comprises a plurality of sets (23) interconnected through tear lines (24), and that the flap (19) of each set (23) is individually operable.

9. A blister pack according to claim 8, characterised in that an open- ing (33) having concave sides is arranged at the intersection between the first fold line (16) and the tear line (24).

10. A blister pack according to claim 8 or 9, characterised in that the first portion (14) of a first set (23a) and the first portion (14) of a second set (23b) are interconnected through the tear line (24), wherein the second portion (15) of the first set (23a) and the second portion (15) of the second set (23b) are foldable separately.