Non-woven fabric with enhanced hardness and sound absorption, manufacturing method therefor, and automotive undercover comprising non-woven fabric with enhanced hardness and sound absorption
AssigneeKolon Industries, Inc.
InventorsHee-jung CHO, Min-ho LEE, Young-shin PARK, Gyu-In JUNG, Woo-seok CHOI
Life of this patent
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Abstract
The present invention relates to non-woven fabric with enhanced hardness and sound absorption, more specifically to non-woven fabric that includes two or more kinds of polyester-based materials and non-circular cross-section fiber, and thus has enhanced hardness and sound absorption as well as improved formability, and that can be applied for an automotive undercover.
Claims6
Long fiber non-woven fabric with enhanced hardness and sound absorption, consisting of a first filament of polyester having a melting point of 250° C. or more with a non-circular cross-section, and a second filament of polyester having a melting point of 180° C. or less with a circular cross-section, wherein, in the non-circular cross-section is in the shape of “+” or “Y”, the content of the second filament is 10-50 wt %, and the sound absorption coefficient (MS341-23 Spec., @5000 Hz) is 0.48 or less.
An automotive undercover comprising long fiber non-woven fabric consisting of a first filament of polyester having a melting point of 250° C. or more with a non-circular cross-section, and a second filament of polyester having a melting point of 180° C. or less, wherein the non-circular cross-section is in the shape of “+” or “Y”, the content of the second filament is 10-50 wt %, and the sound absorption coefficient (MS341-23 Spec., @5000 Hz) is 0.48 or less.
A method for manufacturing non-woven fabric with enhanced hardness and sound absorption, comprising the steps of:
- preparing a first filament with a non-circular cross-section in the shape of “+” or “Y” using polyester having a melting point of 250° C. or more;
- preparing a second filament using polyester having a melting point of 180° C. or less;
- mixing the first filament and the second filament such that a content of the second filament becomes 10-50 wt %, and preparing a nonwoven web using the obtained mixture;
- and
- treating the nonwoven web with hot air at a temperature lower than the temperature at which layers making up an undercover in a plate for an undercover are laminated and the temperature at which an undercover is formed.
A method for manufacturing an automotive undercover, comprising the steps of:
- preparing a first filament with a non-circular cross-section in the shape of “+” or “Y” using polyester having a melting point of 250° C. or more;
- preparing a second filament using polyester having a melting point of 180° C. or less;
- mixing the first filament and the second filament such that a content of the second filament becomes 10-50 wt %, and preparing a nonwoven web using the obtained mixture;
- and
- treating the nonwoven web with hot air at a temperature lower than the temperature at which layers making up an undercover in a plate for an undercover are laminated and a temperature at which an undercover is formed, thus obtaining non-woven fabric with enhanced hardness and sound absorption;
- sequentially stacking polyethylene terephthalate non-woven fabric, a polypropylene film, the non-woven fabric with enhanced hardness and sound absorption, and polyethylene terephthalate non-woven fabric, and laminating them to prepare as a plate;
- and
- introducing the plate into a forming mold to prepare an undercover molded product of a desired shape.
Dependencies are inferred from the claim text.