US2004013831A1PendingUtilityA1

Beverage infusion packages and materials therefor

40
Priority: Jun 30, 2000Filed: Jun 19, 2001Published: Jan 22, 2004
Est. expiryJun 30, 2020(expired)· nominal 20-yr term from priority
Inventors:Nicholas WhittakerJohn RoseSimon Peter Scott
D21H 13/08D21H 27/10D21H 27/38D21H 13/24Y10T428/1334D21H 27/08
40
PatentIndex Score
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Cited by
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References
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Claims

Abstract

A non-woven porous, fibrous tissue for use in producing beverage infusion packages comprises cellulose fibres and polylactic acid (PLA) fibres to improve repulpability of waste materials.

Claims

exact text as granted — not AI-modified
1 . A non-woven porous, fibrous tissue for use in producing beverage infusion packages, wherein said tissue comprises cellulose fibres and polylactic acid PLA fibres to improve re-pulpability of waste materials.  
     
     
         2 . A tissue as  claim 1  wherein the PLA fibres have a fibre length of 2 mm to 8 mm.  
     
     
         3 . A tissue as claimed in  claim 2  wherein the PLA fibres have a fibre length of 4 mm to 6 mm.  
     
     
         4 . A tissue as claimed in  claim 3  wherein the PLA fibres have a fibre length of about 5 mm.  
     
     
         5 . A tissue as claimed in any on  claims 1  to  4  wherein the PLA fibres are from 0.9 dcTex to 4.4 dcTex.  
     
     
         6 . A tissue as claimed in  claim 5  wherein the PLA fibres are from 1.4 dcTex to 3.3 dcTex.  
     
     
         7 . A tissue as claimed in  claim 6  wherein the PLA fibres are from 1.7 dcTex to 2.6 dcTex.  
     
     
         8 . A tissue as claimed in  claim 7  wherein the PLA fibres are from 1.9 dcTex to 2.3 dcTex  
     
     
         9 . A tissue as claimed in any one of  claims 1  to  8  having a basis weight of 10 to 50 g m −2 .  
     
     
         10 . A tissue as claimed in  claim 7  wherein the basis weight is 10 to 30 g m −2 .  
     
     
         11 . A tissue as claimed in  claim 8  wherein the basis weight is 10 to 20 g m −2 .  
     
     
         12 . A tissue as claimed in  claim 9  wherein the basis weight is 12 to 17 g m −2 .  
     
     
         13 . A tissue as claimed in any one of  claims 1  to  12  wherein the heat PLA fibres comprise 10% to 40% by weight of the thermally active layer.  
     
     
         14 . A tissue as claimed in  claim 13  wherein the PLA fibres comprise 25% to 35% by weight of the thermally active layer.  
     
     
         15 . A tissue as claimed in any one of  claims 1  to  14  wherein at least proportion of the PLA fibres are single component fibres.  
     
     
         16 . A tissue as claimed in  claim 15  wherein said single component PLA fibres melt (soften) at a temperature of 145-175° C.  
     
     
         17 . A tissue as claimed in any one of  claims 1  to  16  wherein at least a proportion of the PLA fibres are bicomponent fibres comprised of a PLA core and lower melting PLA sheath.  
     
     
         18 . A tissue as claimed in  claim 17  wherein the thermally active layer comprises single component PLA fibres and bicomponent PLA fibres.  
     
     
         19 . A tissue as claimed in  claim 18  wherein the single component fibres have a, melting (softening) point of 145 to 175° C. and the bicomponent fibres have a sheath with a melting (softening) temperature in the range 105° C. to 165° C. but lower than the melting (softening) temperature of the single component fibres.  
     
     
         20 . A tissue as claimed in any one of  claims 1  to  19  additionally comprising an insulating layer incorporating only thermally inactive fibres.  
     
     
         21 . A tissue as claimed in  claim 20  wherein the thermally active layer comprises 65% to 97% by weight and the insulating layer comprises 3% to 35% by weight, the percentages being based on the weight of the tissue.  
     
     
         22 . A tissue as claimed in  claim 21  wherein the thermally active layer comprises 79% to 93% by weight and the insulating layer comprises 7% to 21% by weight, the percentages being based on the weight of the tissue.  
     
     
         23 . A tissue as claimed in claim to 22 wherein the thermally active layer comprises 83% to 90% by weight and the insulating layer comprises 10% to 17% by weight, the percentages being based on the weight of the tissue.  
     
     
         24 . A tissue as claimed in any one of  claims 20  to  23  wherein the insulating layer comprises wood pulp and lyocell or viscose rayon fibres.  
     
     
         25 . A tissue as claimed in  claim 24  wherein the insulating layer comprises 70% to 95% by weight wood pulp and 5% to 30% by weight lyocell or viscose rayon.  
     
     
         26 . A tissue as claimed in  claim 23  wherein the insulating layer comprises about 100% by weight wood pulp.  
     
     
         27 . A tissue as claimed in any one of  claims 20  to  26  wherein the cellulosic fibres of the insulating layer have a length shorter than those of the thermally active layer.  
     
     
         28 . A tissue as claimed in any one of  claims 20  to  27  wherein the cellulosic fibres of the insulating layer have a length of 0.5 mm to 5 mm.  
     
     
         29 . A tissue as claimed in claim  38  wherein the cellulosic fibres of the insulating layer have a length of 1 mm to 3 mm.  
     
     
         30 . A beverage infusion package comprising a bag of a tissue as claimed in any one of the previous claims and a beverage precursor material contained within the bag.  
     
     
         31 . A package as claimed in  claim 30  which is a tea bag.  
     
     
         32 . A package as claimed in  claim 30  which us a coffee bag.

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