Childproof blister package with controlled opening

Abstract

The present invention relates to a blister package consisting of a lower web in which a row of cavities is provided, and an upper web which is welded to the provided lower web, and wherein perforation lines are provided between adjoining cavities, and wherein there is an area in connection with each cavity where the upper web is not welded to the lower web, such that a snip is created, said upper web being welded to the lower web by a first inner weld which surrounds the cavity completely, as well as a second outer weld which surrounds the cavity around the first weld and adjoins the area where the upper web is not welded to the lower web. The invention also relates to a method of making the blister package.

Claims

1. A blister package, comprising: a lower web in which a row of cavities is provided; and; an upper web which is welded to the provided lower web; wherein perforation lines are provided between adjoining cavities; and wherein there is an area in connection with each cavity where the upper web is not welded to the lower web, said area forming a snip; and; wherein the upper web is welded to the lower web by a first, inner weld which surrounds one of the cavities completely, and a second, outer weld which surrounds said one cavity partly around the first, inner weld and terminates at the area where the upper web is not welded to the lower web.

2. The blister package according to claim 1, wherein the blister package comprises two rows of cavities.

3. The blister package according to claim 2, wherein the areas which are not welded to the lower web are disposed between four of the cavities.

4. The blister package according to claim 3, wherein the areas which are not welded to the lower web are separated by the perforation lines.

5. The blister package according to claim 1, wherein an at least partial weld is provided along an edge of the area which is not welded to the lower web, said edge facing toward the cavity.

6. The blister package according to claim 1, wherein materials for the upper web are selected from polyvinyl chloride (PVC), polyethylene terephthalate (PET), amorphous polyethylene terephthalate (APET), polypropylene (PP), polyethylene (PE) coated aluminium or PE coated APET.

7. The blister package according to claim 1 wherein the width of the first, inner weld is variable.

8. The A blister package according to claim 1, wherein the width of the second, outer weld is variable.

9. The blister package according to claim 1, wherein the first, inner weld has a width between 0.05 mm and 5 mm.

10. The blister package according to claim 1, wherein the second, outer weld has a width between 0.05 mm and 5 mm.

11. A method of making a blister package, said method comprising: providing a lower web configured with cavities; providing an upper web; bringing the upper web into contact with the lower web; attaching the upper web to the lower web by a first weld which, in the form of a rim, surrounds one of the cavities completely; performing an additional, secondary weld which, in the form of a rim, surrounds said one cavity partly around the first weld, said secondary weld being terminated at an area where the upper web is not welded to the lower web, said area creating a snip.

12. The method according to claim 11, further comprising providing perforations between the cavities.

13. The method according to claim 11, wherein the first weld is welded with a rim width between 0.05 mm and 5 mm.

14. The method according to claim 11, wherein the secondary weld is welded with a rim width between 0.05 mm and 5 mm.

15. The blister package according to claim 1, wherein the first, inner weld has a width between 0.1 mm and 3 mm.

16. The blister package according to claim 1, wherein the second, outer weld has a width between 0.1 mm and 3 mm.

17. The method according to claim 11, wherein the first weld is welded with a rim width between 0.1 mm and 3 mm.

18. The method according to claim 11, wherein the secondary weld is welded with a rim width between 0.1 mm and 3 mm.

19. The method according to claim 12, wherein the secondary weld is welded so as to extend to an edge of the blister package and to the perforations in areas where the secondary weld is welded to the lower web.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a blister package according to the invention, seen toward the lower web, and

(2) FIG. 2 shows the blister package, seen toward the upper web.

DETAILED DESCRIPTION

(3) FIG. 1 shows a blister package 1 according to the invention, seen toward the lower web 2 with the cavities 3. Around each cavity 3, there is a first weld 4 which extends all the way around the cavity 3, as well as an additional secondary weld 5 which extends around the first weld 4 and adjoins an area 6 where the upper web 12 (not shown in FIG. 1) and the lower web 2 are not welded together.

(4) The blister package 1 is traversed by perforations 7, so that each cavity 3 may be torn off the blister package 1 as an independent unit 8.

(5) The perforations 7 intersect each other in the areas 6 where the upper web is not welded to the lower web, thereby providing, for each of the units 8 with cavities 3, a snip 9 which may be used for tearing off the upper web from the lower web, thereby opening the cavity 3.

(6) In this embodiment, the areas 6 are surrounded by a thin weld 10. However, the weld 10 is not required and may be omitted in other embodiments. In this case, the weld 10 is four-sided, but it may also be circular, oval or have other shapes. Likewise, the welds 4 and 5 may be made with a varying width to change the force to be used in order to tear off the upper web from the lower web.

(7) FIG. 2 shows the blister package 1 seen down toward the upper web 12. The figure shows the first weld 4, which completely surrounds the area 3a below which the cavity is present. The second secondary weld 5 extends around the first weld 4, adjoining the area 6 where the upper web 12 is not welded to the lower web 2 (not shown in FIG. 2).

(8) The perforations 7 traverse the blister package 1 and intersect each other in the areas 6, so that four snips 9 are provided in each area. Each individual snip may be used for tearing off the upper web from a single cavity 3, each of the cavities being delimited from each other by the perforation lines 7, so that each cavity may be regarded as forming an independent unit 8 from which the upper web may be torn off from the individual cavity. In the embodiment shown, the secondary welds 5 in principle extend along the rim or the edge of the blister package 1 and along the perforations 7. This may involve advantages in terms of production, it being then possible, on large parts of the blister package, to make the secondary weld as a wide weld (in double width), which is then divided into two by the perforation line.