US2021222335A1PendingUtilityA1

Fibrous nonwoven web

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Assignee: CHEMIEFASER LENZING AGPriority: Apr 6, 2018Filed: Apr 8, 2019Published: Jul 22, 2021
Est. expiryApr 6, 2038(~11.7 yrs left)· nominal 20-yr term from priority
Inventors:Thomas MaierRudiger Irk
D04H 1/498D04H 1/4258D21H 27/002D21H 13/08D04H 1/26D04H 1/492
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Claims

Abstract

The present invention relates to a fibrous nonwoven web, a method for its preparation as well as to uses of the novel fibrous nonwoven web.

Claims

exact text as granted — not AI-modified
1 . Fibrous nonwoven web, comprising pulp and lyocell fibers, wherein the weight amount of pulp is at least 35 wt. % of the lyocell fibers, and wherein the lyocell fibers have a length of from 5 to 25 mm and the pulp fibers have a length of from 1.5 to 5 mm. 
     
     
         2 . The fibrous nonwoven web according to  claim 1 , wherein the weight ratio of lyocell fibers to pulp is from 50:50 to 10:90. 
     
     
         3 . The fibrous nonwoven web according to  claim 1 , wherein the pulp has a fiber coarseness of from 8 to 20. 
     
     
         4 . The fibrous nonwoven web according to  claim 1 , wherein the lyocell fibers have a titer of from 0.9 to 3.3 dtex. 
     
     
         5 . The fibrous nonwoven web according to  claim 1 , wherein the web has a basis weight of from 25 to 200 gsm. 
     
     
         6 . The fibrous nonwoven web according to  claim 1 , wherein the web is structured by means of providing embossing, perforations and/or three dimensional structures. 
     
     
         7 . The fibrous nonwoven web according to  claim 1 , wherein the web has a dry tensile strength in machine direction of more than 50 N/5 cm and a dry tensile strength in cross direction of more than 10 N/5 cm. 
     
     
         8 . The fibrous nonwoven web according to  claim 1 , wherein the web has a wet tensile strength in machine direction of more than 15 N/5 cm and a wet tensile strength in cross direction of more than 5 N/5 cm. 
     
     
         9 . The fibrous nonwoven web according to  claim 1 , wherein the web does not contain synthetic thermoplastic binder components and/or synthetic fibers. 
     
     
         10 . Process for preparing a fibrous nonwoven web according to  claim 1 , comprising the steps of providing a mixture of pulp and lyocell fibers in an aqueous medium, wherein the weight amount of pulp is equal to or greater than the weight amount of the lyocell fibers, and wherein the lyocell fibers have a length of from 5 to 25 mm and the pulp fibers have a length of from 1.5 to 5 mm, dispensing the mixture on a belt, dewatering the dispensed mixture and hydroentangling the dewatered mixture to obtain a fibrous nonwoven web 
     
     
         11 . The process according to  claim 10 , wherein hydroentangling is carried out using at least two water beams. 
     
     
         12 . The process according to  claim 10 , wherein a drying step is provided after dewatering and prior to hydroentangling. 
     
     
         13 . The process according to  claim 10 , wherein the energy consumption during hydroentangling is adjusted to a value of from 0.05 to 1 kWh/kg. 
     
     
         14 . The process according to  claim 10 , wherein all water beams are provided on the same side of the material to be hydroentangled or wherein the water beams are provided on different sides of the material to be hydroentangled. 
     
     
         15 . The process according to  claim 10 , wherein after hydroentangling a de-watering and drying of the hydroentangled web is carried out, preferably by means of vacuum systems and through air dryers, respectively. 
     
     
         16 . The fibrous nonwoven web according to  claim 1 , wherein the weight amount of pulp is equal to or greater than the weight amount of the lyocell fibers. 
     
     
         17 . The fibrous nonwoven web according to  claim 2 , wherein the weight ratio of lyocell fibers to pulp is from 15:85 to 45:55. 
     
     
         18 . The fibrous nonwoven web according to  claim 3 , wherein the pulp has a fiber coarseness of from 10 to 15. 
     
     
         19 . The fibrous nonwoven web according to  claim 3 , wherein the pulp has a fiber coarseness of from 12 to 14. 
     
     
         20 . The fibrous nonwoven web according to  claim 4 , wherein the lyocell fibers have a titer of from 1.15 to 2 dtex. 
     
     
         21 . The fibrous nonwoven web according to  claim 5 , wherein the web has a basis weight of from 50 to 150 gsm. 
     
     
         22 . The process according to  claim 11 , wherein hydroentangling is carried out using at least 4 water beams. 
     
     
         23 . The process according to  claim 13 , wherein the energy consumption during hydroentangling is adjusted to a value of from 0.1 to 0.75 kWh/kg.

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