Modulus nonwoven webs based on multi-layer blown microfibers
First Claim
1. A melt-blown nonwoven web comprising melt-blown microfibers having at least two continuous layers throughout said fiber length comprised of at least one first layer of a self-bonding material, at melt-blowing conditions, and at least one second layer of a relatively high modulus material wherein the melt-blown web has a tensile modulus at least 1.5 times greater than a mean web modulus, M1 X1 +M2 X2, where M1 and M2 are the tensile modulus values of corresponding nonwoven webs of the first layer material and second layer material respectively and X1 and X2 are the respective volume fractions of the first and second layer materials.
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Abstract
A high modulus nonwoven web is produced using a high modulus material and a self-bonding material formed as multi-layer melt-blown microfibers where the web modulus is greater the MX1 +MX2 where M1 and M2 represent the modulus values of webs formed from the two materials and X1 and X2 represent the respective volume portions of the materials in the web fibers.
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Citations
16 Claims
- 1. A melt-blown nonwoven web comprising melt-blown microfibers having at least two continuous layers throughout said fiber length comprised of at least one first layer of a self-bonding material, at melt-blowing conditions, and at least one second layer of a relatively high modulus material wherein the melt-blown web has a tensile modulus at least 1.5 times greater than a mean web modulus, M1 X1 +M2 X2, where M1 and M2 are the tensile modulus values of corresponding nonwoven webs of the first layer material and second layer material respectively and X1 and X2 are the respective volume fractions of the first and second layer materials.
Specification