Undercover for vehicles having high elasticity and rigidity and method for manufacturing the same
Disclosed are an undercover for vehicles with high elasticity and rigidity and a method of manufacturing the same. The undercover for vehicles with high elasticity and rigidity may include a needle-punched nonwoven fabric having a multi-layer structure of felt layers including a first PET fiber and a low-melting-point PET fiber, and each of the felt layers may have improved tensile strength and have optimized fiber alignment, to thereby improve the binding between fibers, mechanical rigidity and elasticity, as well as to reduce the weight of components, improve durability and secure harmlessness and inline workability.
1. A method of manufacturing an undercover for vehicles with high elasticity and high rigidity comprising: providing a first polyethylene terephthalate fiber having a melting point of about 240 to 270° C. and a low-melting-point polyethylene terephthalate fiber having a melting point of about 105 to 180° C.; forming a fiber web by carding an amount of about 1 to 40% by weight of the first polyethylene terephthalate fiber and an amount of about 60 to 99% by weight of the low-melting-point polyethylene terephthalate fiber based on the total weight of the fiber web; forming each of a first felt layer and a second felt layer by binding and hot-pressing the fiber web; forming each of a first nonwoven fabric layer and a second nonwoven fabric layer by alternately laminating the first felt layer and the second felt layer in two to three layers; and producing a needle-punched nonwoven fabric by laminating the second nonwoven fabric layer on the first nonwoven fabric layer, followed by needle punching, wherein the first polyethylene terephthalate fiber has a tensile strength of about 3 to 3.7 g/De, the low-melting-point polyethylene terephthalate fiber has a tensile strength of about 3 to 3.7 g/De, and the number of times of the needle punching in production of the needle-punched nonwoven fabric is about 20 to 80 punching/cm 2 .
2. The method according to claim 1 , wherein the first polyethylene terephthalate fiber has a fiber length of about 48 to 76 mm.
3. The method according to claim 1 , wherein the low-melting-point polyethylene terephthalate fiber has a fiber length of about 48 to 76 mm.
4. The method according to claim 1 , wherein, in the forming the each of the first nonwoven fabric layer and the second nonwoven fabric layer, each of the first nonwoven fabric layer and the second nonwoven fabric layer is formed by repeatedly laminating the fiber web in a multilayer structure of three to five layers thereof.
5. The method according to claim 1 , wherein, in the producing the needle-punched nonwoven fabric, the needle-punched nonwoven fabric has a weight per unit area of about 600 to 1,500 g/m 2 .