Monofilament for use in screen gauze and screen gauze using the same

Abstract

A screen gauze formed of a core-sheath composite monofilament comprising the core 1 formed by a fiber-forming polymer 4 containing a material 3 having a property of absorbing light at wavelengths of 350 nm to 450 nm and the sheath 2 formed by a fiber-forming polymer 5, the core-sheath composite monofilament having average reflectance of 15% or less to light at wavelengths of 350 nm to 450 nm, and a screen gauze using the same. The monofilament is free from strength reduction, scum generation and abrasion of related parts such as reed, and makes no difficulty in ink-release, and requires no dyeing process and thus no additional cost therefor.

1 . A screen gauze, characterized in that at least one of warp and weft of said screen gauze comprises a core-sheath composite monofilament,
 said core-sheath composite monofilament comprising:
 a core formed by a fiber-forming polymer containing a light-absorbing material having a property of absorbing light at wavelengths of 350 nm to 450 nm, and 
 a sheath formed by a fiber-forming polymer, 
   said core-sheath composite monofilament having average reflectance of 15% or less to light at wavelengths of 350 nm to 450 nm.   
     
     
         2 . The screen gauze of  claim 1 , wherein said light-absorbing material is present in an amount of 0.1 to 2.0% by weight based on the total core. 
     
     
         3 . The screen gauze of  claim 1 , wherein the cross-sectional area ratio of core to sheath is in a range of 40:60 to 90:10. 
     
     
         4 . The screen gauze of  claim 1 , wherein the elongation at break of said core-sheath composite monofilament is 20 to 30% and the strength at break of said core-sheath composite monofilament is 5.5 cN/dtex or more. 
     
     
         5 . The screen gauze of  claim 1 , wherein said core comprises polyester having an intrinsic viscosity of 0.60 or more. 
     
     
         6 . The screen gauze of  claim 1 , wherein said sheath comprises nylon 6 having a relative viscosity of 2.0 or more.