Waterproof sound-permitting sheet, method of manufacturing same, and electronic device provided with waterproof sound-permitting sheet
Provided is a waterproof sound-permitting sheet, including: a porous substrate having a plurality of pores; and a porous nanoweb, which is stacked on the porous substrate, has a plurality of pores, and is formed by electrospinning a polymer material to which a black or a different color pigment is added, thereby improving waterproofing performance and sound penetration performance by forming on a porous substrate, such as non-woven fabric, the porous web having the black or the different color by using the electrospinning method, and can shorten a production process by eliminating a pigment coating step by means of adding the pigment to the polymer material when manufacturing the porous nanoweb according to the electrospinning method.
1. A waterproof sound-permitting sheet comprising:
a porous substrate layer having a plurality of first pores;
a porous nanoweb layer, which is stacked on a first surface of the porous substrate layer, has a plurality of second pores, and is formed by electrospinning a polymer material to which a color pigment is added, and the porous nanoweb layer is formed of accumulation of ultra-fine fiber strands having a diameter in a range of 0.3-1.5 urn by electrospinning the polymer material and the first pores have an average size of 2 um or less; and
a double-sided adhesive tape which is stacked along an edge of the porous nanoweb layer on a second surface opposite to the first surface of the porous substrate layer, wherein the double-sided adhesive tape comprises: a substrate layer formed in a nanoweb layer form and having a plurality of third pores, a first adhesive layer formed on a first surface of the substrate layer, the first adhesive layer being formed in a first nanoweb form made of first nanofiber strands, the first nanofiber strands being made of a first adhesive material; and a second adhesive layer formed on a second surface opposite to the first surface of the substrate layer, the second adhesive layer formed in a second nanoweb form made of second nanofiber strands, the second nanofiber strands being made of a second adhesive material.
2. The waterproof sound-permitting sheet according to claim 1 , wherein the porous substrate layer is formed of any one selected from the group consisting of a thermal bond nonwoven fabric, a spun bond nonwoven fabric, a chemical bond nonwoven fabric, an air-laid nonwoven fabric, a cloth, styrofoam, paper, and a mesh.
3. The waterproof sound-permitting sheet according to claim 1 , wherein a color pigment is coated on the porous substrate layer.
4. The waterproof sound-permitting sheet according to claim 1 , wherein the polymer material includes any one selected from the group consisting of PAN, polyvinylidene fluoride (PVdF), polyester sulfone (PES), and polystyrene (PS), or a mixture of polyvinylidene fluoride (PVdF) and polyacrylonitrile (PAN), or a mixture of PVdF and PES, or a mixture of PVdF and thermoplastic polyurethane (TPU).
5. The waterproof sound-permitting sheet according to claim 1 , wherein the porous substrate layer comprises: a first porous substrate that is stacked on a first surface of the porous nanoweb layer; and a second porous substrate that is stacked on a second surface opposite to the first surface of the porous nanoweb.
6. The waterproof sound-permitting sheet according to claim 1 , wherein the porous nanoweb layer comprises: a first nanoweb layer that is stacked on the first surface of the porous substrate layer; and a second nanoweb layer that is stacked on the second surface of the porous substrate layer.
7. An electronic device comprising:
a body in which an air vent hole is formed in order to discharge heat or air generated inside of the electronic device; and
a waterproof sound-permitting sheet according to claim 1 disposed on the air vent hole.