US2003113411A1PendingUtilityA1
Beverage infusion packages and materials therefor
Priority: Dec 13, 1999Filed: Dec 13, 2000Published: Jun 19, 2003
Est. expiryDec 13, 2019(expired)· nominal 20-yr term from priority
B65D 85/808D21H 13/14D21H 27/08D21H 27/10
33
PatentIndex Score
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Claims
Abstract
A beverage infusion package (e.g. a tea bag) is formed of porous, fibrous cellulosic material and has a closure seam produced by a mechanical compression action without heat sealing. The porous material contains thermoplastic fibres which are amorphous or are only partially crystalline and which make the package eminently suitable for infusion in a microwave oven. The porous, fibrous material may have a basis weight of 10 to 30 g m −2 and be comprises of a single wet-laid layer of an admixture of cellulosic fibres and the thermoplastic fibres.
Claims
exact text as granted — not AI-modified1 . A beverage infusion package formed of porous, fibrous cellulsoic material and having a closure seam produced by a mechanical compression action without heat sealing characterised in that the porous material contains thermoplastic fibres which are amorphous or are only partially crystaline.
2 . A package as claimed in claim 1 wherein the thermoplastic fibres are present as a fused or thermally bonded network.
3 . A package as claimed in claim 1 or 2 wherein the thermoplastic has a crystallinity of less then 40%, preferably 10% to 20%.
4 . A package as claimed in any one of claims 1 to 3 wherein the thermoplastic is selected from polypropylene, polyester, polyamide and high density polyethylene.
5 . A package as claimed any one of claims 1 to 4 wherein the fibrous material comprises 5 to 30% by weight of the thermoplastic fibres.
6 . A package as claimed in claim 5 wherein the porous fibrous material comprises 10 to 30% by weight of thermoplastic fibres.
7 . A package as claimed in claim 6 wherein the porous fibrous material comprises 15% to 25% by weight of the thermoplastic fibres.
8 . A package as claimed in any one of claims 1 to 7 wherein the thermoplastic fibres have a thickness in the range 0.5 to 6.0 denier.
9 . A package as claimed in claim 8 wherein the thermoplastic fibres have a thickness in the range 2 to 4 denier.
10 . A package as claimed in any one of claims 1 to 8 wherein the porous fibrous material is hydrophilic.
11 . A package as claimed in claim 9 wherein the porous fibrous material has a water climb value of least 70 seconds as measured by the time taken for water to rise 1 inch up that material.
12 . A package as claimed in claim 10 wherein the porous fibrous material has a water climb value of 20 to 40 seconds.
13 . A package as claimed in any one of claims 1 to 12 wherein the porous fibrous material has been treated with poly(vinylalcohol) having a degree of hydrolysis of at least 60%.
14 . A package as claimed in claim 13 wherein the poly(vinylalcohol) has a degree of hydrolysis of at least 80%.
15 . A package as claimed in claim 14 wherein the poly(vinylalcohol) has a degree of hydrolysis of 95% to 99%.
16 . A package as claimed in any one of claims 1 to 15 wherein the porous fibrous material has a basis weight of 10 to 30 g m −2 .
17 . A package as claimed in any one of claims 1 to 16 wherein the mechanically formed seam has been formed by folding over together adjacent edges of the porous material and applying a mechanical compressive force to the folded over edges.
18 . A package as claimed in any one of claims 1 to 17 wherein the seam is a crimped seam.
19 . A package as claimed in any one of claims 1 to 18 which is of the double-chamber type.
20 . A package as claimed in any one of claims 1 to 19 which is a tea bag.
21 . A porous fibrous material having a basis weight of 10 to 30 g m −2 and being comprised of a single, wet-laid layer of an admixture of cellulosic and thermoplastic fibres which are amorphous or only partially crystalline.
22 . A material as claimed in claim 21 wherein the thermoplastic fibres are present as a fused or thermally bonded network.
23 . A material as claimed in claim 21 or 22 wherein the thermoplastic has a crystallinity of less then 40%.
24 . A material as claimed in any one of claims 21 to 23 wherein the thermoplastic is selected from polypropylene, polyester, polyamide and high density polyethylene.
25 . A material as claimed any one of claims 21 to 24 wherein the fibrous material comprises 5 to 30% by weight of the thermoplastic fibres.
26 . A material as claimed in claim 25 wherein the porous fibrous material comprises 10 to 30% by weight of thermoplastic fibres.
27 . A material as claimed in claim 26 wherein the porous fibrous material comprises 15% to 25% by weight of the thermoplastic fibres.
28 . A material as claimed in any one of claims 21 to 27 wherein the thermoplastic fibres have a thickness in the range 0.5 to 6.0 denier.
29 . A material as claimed in claim 28 wherein the thermoplastic fibres have a thickness in the range 2 to 4 denier.
30 . A material as claimed in any one of claims 21 to 29 wherein the porous fibrous material is hydrophilic.
31 . A material as claimed in claim 30 wherein the porous fibrous material has a water climb value of least 70 seconds as measured by the time taken for water to rise 1 inch up that material.
32 . A material as claimed in claim 31 wherein the porous fibrous material has a water climb value of 20 to 40 seconds.
33 . A material as claimed in any one of claims 21 to 32 wherein the porous fibrous material has been treated with poly(vinylalcohol) having a degree of hydrolysis of at least 60%.
34 . A material as claimed in claim 33 wherein the poly(vinylalcohol) has a degree of hydrolysis of at least 80%.
35 . A material as claimed in claim 34 wherein the poly(vinylalcohol) has a degree of hydrolysis of 95% to 99%.Join the waitlist — get patent alerts
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