Spiral-wound filter module exhibiting almost no heavy metal leaching and manufacturing method thereof

A spiral-wound filter module comprising:

• a filtered-water flow channel sheet including a fabric exhibiting almost no heavy metal leaching;
• a separation membrane sheet;
• and
• an influent-water flow channel sheet,
• wherein the fabric exhibiting almost no heavy metal leaching is a tricot knitted fabric formed by knitting sheath-core polyester fibers including antimony (Sb) in an amount of 1 ppb or less,
• wherein each of a core-part polyester resin and a sheath-part polyester resin constituting the sheath-core polyester fibers is a resin that is polymerized by using a polymerization catalyst including only a titanium (Ti)-based catalyst,
• wherein the fabric exhibiting almost no heavy metal leaching allows a heavy metal having an atomic weight of 63 g/mol to 200 g/mol and a density of 4 g/cm3 or more to be leached in a leaching amount of 1 ppb or less,
• wherein the leaching amount is obtained by a specimen prepared by cutting the fabric exhibiting almost no heavy metal leaching so as to have a weight of 0.7 g is immersed in 1,000 g of deionized water (DI water) having a purity of 99.9% or more for 100 hours and then taken out, and a concentration of a metal element leached into the deionized water is measured,
• wherein the sheath-part polyester resin has a melting point in the range of 150° C. to 180° C.,
• wherein the core-part polyester resin and the sheath-part polyester resin are prepared by performing an esterification and a condensation polymerization of a mixture containing an acid component, a diol component, and the titanium-based catalyst,
• wherein the acid component of the core-part polyester resin and the sheath-part polyester resin includes one or more selected from among terephthalic acid (TPA) and isophthalic acid,
• wherein the diol component of the core-part polyester resin includes 1,4-butandiol,
• wherein the sheath-core polyester fibers of the tricot knitted fabric are heat treated at 170 to 250° C. for 30 seconds to 3 minutes.