HIGH BARRIER POWDER CAPSULE

Abstract

A capsule article (100) includes a polymeric body (110) extending along a longitudinal axis from a first end to a second end and defining a capsule cavity (105) containing powder, and a metal foil (120) and a sealant layer (130) covering an outer surface of the polymeric body. A method of forming a hermetic capsule includes the steps of wrapping a capsule, with a metal foil; and enclosing the capsule with a sealant layer to form a hermetic barrier enclosing the capsule.

Claims

1. A capsule article comprising: a polymeric body extending along a longitudinal axis from a first end to a second end and defining a capsule cavity containing powder; and a metal foil and a sealant layer covering an outer surface of the polymeric body, wherein the sealant layer and metal foil cooperate to form a hermetic barrier enclosing the polymeric body or capsule cavity.

2. The capsule article of claim 1, wherein the sealant layer contacts the metal foil and the metal foil separates the sealant layer from the polymeric body.

3. The capsule article of claim 1, wherein the sealant layer contacts the metal foil and the sealant layer separates the metal foil from the polymeric body.

4. The capsule article of claim 1, wherein the sealant layer contacts the metal foil and the sealant layer separates the metal foil from the polymeric body and a second sealant layer contacts the metal foil and the metal foil separates the sealant layer from the second sealant layer.

5. The capsule article of claim 1, wherein the polymeric body defines an obround shape and the metal foil and a sealant layer define an obround shape.

6. The capsule article of claim 1, wherein the sealant layer has a melting temperature of about 100 degrees Celsius or less.

7. The capsule article of claim 1, wherein the sealant layer has a thickness of about 2 micrometres to about 15 micrometres.

8. The capsule article of claim 1, wherein the sealant layer comprises a wax material.

9. The capsule article of claim 1, wherein the sealant layer comprises a microcrystalline wax.

10. The capsule article of claim 1, wherein the metal foil has a thickness in a range from about 2 micrometres to about 10 micrometres.

11. The capsule article of claim 1, wherein the metal foil comprises aluminum foil.

12. A method of forming a hermetic capsule comprising the steps of: wrapping a capsule, with a metal foil; and enclosing the capsule with a sealant layer to form a hermetic barrier enclosing the capsule.

13. The method according to claim 12, wherein the enclosing step comprises enclosing the metal foil with the sealant layer.

14. The method according to claim 12, wherein the enclosing step comprises enclosing the capsule with the sealant layer and then wrapping the sealant layer with the metal foil.

15. The method according to claim 14, wherein the enclosing step comprises enclosing the metal foil with a second sealant layer.

16. The capsule article of claim 1, wherein the sealant layer has a melting temperature in a range from about 40 degrees Celsius to about 80 degrees Celsius.

17. The capsule article of claim 1, wherein the sealant layer has a thickness from about 3 micrometres to about 10 micrometres.

18. The capsule article of claim 1, wherein the metal foil has a thickness in a range from about 4 micrometres to about 8 micrometres.

19. The capsule article of claim 1, wherein the sealant layer comprises a wax material, and the metal foil comprises aluminum foil.

20. The capsule article of claim 3, wherein the sealant layer comprises a wax material, and the metal foil comprises aluminum foil, and the sealant layer has a thickness from about 3 micrometres to about 10 micrometres, and the metal foil has a thickness in a range from about 4 micrometres to about 8 micrometres.

Description

[0093] The Examples will now be further described with reference to the figures in which:

[0094] FIG. 1 is a perspective schematic diagram of an illustrative high barrier capsule;

[0095] FIG. 2 is a cross-sectional schematic diagram of an illustrative high barrier capsule taken along line 2-2 of FIG. 1;

[0096] FIG. 3 is a cross-sectional schematic diagram of another illustrative high barrier capsule taken along line 2-2 of FIG. 1; and

[0097] FIG. 4 is a cross-sectional schematic diagram of another illustrative high barrier capsule taken along line 2-2 of FIG. 1.

[0098] The schematic drawings are not necessarily to scale and are presented for purposes of illustration and not limitation. The drawings depict one or more aspects described in this disclosure. However, it will be understood that other aspects not depicted in the drawing fall within the scope and spirit of this disclosure.

[0099] FIG. 1 is a perspective schematic diagram of an illustrative high barrier capsule 100. FIG. 2 to FIG. 4 are alternate configurations of the high barrier capsule 100. The high barrier capsule 100 includes a polymeric body 110 extending along a longitudinal axis L.sub.A from a first end 101 to a second end 102 defining a capsule cavity 105 containing powder 150. A metal foil 120 and a sealant layer 130 cover an outer surface of the polymeric body 110.

[0100] FIG. 2 is a cross-sectional schematic diagram of an illustrative high barrier capsule 100. The sealant layer 130 contacts the metal foil 120 and the sealant layer 130 separates the metal foil 120 from the polymeric body 110.

[0101] FIG. 3 is a cross-sectional schematic diagram of another illustrative high barrier capsule 100. The sealant layer 130 contacts the metal foil 120 and the metal foil 120 separates the sealant layer 130 from the polymeric body 110.

[0102] FIG. 4 is a cross-sectional schematic diagram of another illustrative high barrier capsule high barrier capsule 100. The sealant layer 130 contacts the metal foil 120 and the sealant layer 130 separates the metal foil 130 from the polymeric body 110 and a second sealant layer 135 contacts the metal foil 120 and the metal foil 120 separates the sealant layer 130 from the second sealant layer 135.

[0103] For the purpose of the present description and of the appended claims, except where otherwise indicated, all numbers expressing amounts, quantities, percentages, and so forth, are to be understood as being modified in all instances by the term “about”. Also, all ranges include the maximum and minimum points disclosed and include any intermediate ranges therein, which may or may not be specifically enumerated herein. In this context, therefore, a number A is understood as A±2% of A. Within this context, a number A may be considered to include numerical values that are within general standard error for the measurement of the property that the number A modifies. The number A, in some instances as used in the appended claims, may deviate by the percentages enumerated above provided that the amount by which A deviates does not materially affect the basic and novel characteristic(s) of the claimed invention. Also, all ranges include the maximum and minimum points disclosed and include any intermediate ranges therein, which may or may not be specifically enumerated herein.