Abstract: The object is to improve the production efficiency of three-dimensional net-like structures while maintaining the surface quality of the three-dimensional net-like structures. A second chute 6 is located below a hole-free region 33 and is provided between first chutes 4a and 4b. Filaments 20a and 20b located on longitudinal sides 22b and 22c at the periphery of assemblies 21a and 21b are in contact with the upper side of inclined surfaces 46a and 46b of the second chute 6. Such contact disturbs the vertical fall of the filaments 20a and 20b and causes the filaments 20a and 20b to be tangled in loops with the adjacent filaments 20a and 20b and pass through the first chutes 4a and 4b and the second chute 6, while being cooled down with water supplied from openings 51a, 51b and 51c.

Abstract: By taking into account the difficulty in smoothly bending along the shape of, for example, a care bed, there is provided a three-dimensional net-like structure made from polyester having a swelling ratio dependent on a shear rate such as to be 1.10 to 1.38 at a shear rate of 60.8 sec?1 and 1.17 to 1.43 at a shear rate of 608 sec?1 and having an MFR of 3 to 35 g/10 min and a density of 1.01 to 1.60 g/cm3 and configured to have a spring structure of filaments randomly brought into contact with and tangled with one another, have a three-dimensional striped sparse-dense configuration in a lateral direction relative to an extrusion direction. The swelling ratio is shown as D2/D1 against shear rate when a molten thermoplastic resin is extruded to filaments from a capillary having a tube inner diameter D1 of 1.0 mm and a length of 10 mm and D2 denotes a diameter of cross section of the filaments extruded and cooled down.

Abstract: By taking into account the difficulty in smoothly bending along the shape of, for example, a care bed, there is provided a three-dimensional net-like structure made from polyethylene having a swelling ratio dependent on a shear rate such as to be 0.93 to 1.16 at a shear rate of 24.3 sec?1 and 1.15 to 1.34 at a shear rate of 608 sec?1 and having an MFR of 3 to 35 g/10 min and a density of 0.82 to 0.95 g/cm3 and configured to have a spring structure of filaments randomly brought into contact with and tangled with one another, have a three-dimensional striped sparse-dense configuration in a lateral direction relative to an extrusion direction. The swelling ratio is shown as D2/D1 against shear rate when a molten thermoplastic resin is extruded to filaments from a capillary having a tube inner diameter D1 of 1.0 mm and a length of 10 mm and D2 denotes a diameter of cross section of the filaments extruded and cooled down.

Abstract: An apparatus for manufacturing a three-dimensional netted structure, the apparatus including: drawing-down units, the drawing-down units being submerged or partly-submerged in a liquid, and a die with a mouthpiece having a plurality of holes, the die adapted to extrude the filaments downward at a speed lower than the filament dropping speed whereby the filaments drop in between the drawing-down units. The distance between the drawing-down units is smaller than the width of the assembly of the extruded filaments. The drawing-down units are adapted to contact four surfaces of the assembly of the filaments before or after the drawing-down units are submerged.

Abstract: A self resonance-type sound-producing speaker that is waterproof and readily attachable. The self resonance-type sound-producing speaker includes an actuator speaker unit and a polymer foam arranged to cover the entire outer surface of this speaker unit and converts the vibrations from the speaker unit into plane waves to externally produce sound. The polymer foam preferably has the expansion ratio of 10 to 30 times and the closed pore structure. The thickness of the polymer foam is preferably not less than 2 mm and is more preferably not less than 3 mm.

Abstract: An apparatus for manufacturing a three-dimensional netted structure, having a pair of opposing chutes located below the mouthpiece along the width direction of the filament assembly and vertical to the thickness direction of the filament assembly, the chutes being inclined so that the distance between each the chute becomes narrower downward and toward the center of the filament assembly, the cooling water is supplied on the surface of the chutes, the cooling water flowing on the chutes receives the filaments in a surface part of the filament assembly to form loops and make the adjacent continuous filaments contact and be entangled with each other, and a surface layer having a higher apparent density and an inner layer having a lower apparent density located inside the surface layer are formed by the conveyor.

Abstract: A method for forming cushions including the following four steps: (1) a compression step in which the structure (2) is compressed in a mold (3); (2) a thermal softening step in which the structure (2) is thermally softened by means of a heating medium; (3) a curing step in which the structure (2) directly undergoes forced cooling in a cooling medium, and is then cured; and (4) a mold release step in which the structure (2) is released from the mold (3).

Abstract: A method for forming cushions including the following four steps: (1) a compression step in which the structure (2) is compressed in a mold (3); (2) a thermal softening step in which the structure (2) is thermally softened by means of a heating medium; (3) a curing step in which the structure (2) directly undergoes forced cooling in a cooling medium, and is then cured; and (4) a mold release step in which the structure (2) is released from the mold (3).

Abstract: A three-dimensional netted structure having an upper surface, a lower surface, two side surfaces a left end surface, and a right end surface, including at least a plurality of filaments helically and randomly entangled and thermally bonded together, wherein the filaments are formed out of a thermoplastic resin by extrusion molding followed by cooling with a liquid; and the netted structure is four-surface molded, the upper surface, the lower surface and the two side surfaces being molded. An apparatus and a method for manufacturing the three-dimensional netted structure.

Abstract: A three-dimensional netted structure having an upper surface, a lower surface, two side surfaces a left end surface, and a right end surface, including at least a plurality of filaments helically and randomly entangled and thermally bonded together, wherein the filaments are formed out of a thermoplastic resin by extrusion molding followed by cooling with a liquid; and the netted structure is four-surface molded, the upper surface, the lower surface and the two side surfaces being molded. An apparatus and a method for manufacturing the three-dimensional netted structure.

Abstract: A three-dimensional netted structure having an upper surface, a lower surface, two side surfaces a left end surface, and a right end surface, including at least a plurality of filaments helically and randomly entangled and thermally bonded together, wherein the filaments are formed out of a thermoplastic resin by extrusion molding followed by cooling with a liquid; and the netted structure is four-surface molded, the upper surface, the lower surface and the two side surfaces being molded. An apparatus and a method for manufacturing the three-dimensional netted structure.

Abstract: A method of manufacturing a three-dimensional netted structure by (a) extruding molten filaments of a thermoplastic resin downward from a die via a mouthpiece of the die having a plurality of holes such that the filaments drop under the force of gravity in between drawing-down units, (b) drawing down the assembly of extruded filaments at a speed lower than the filament dropping speed by the drawing-down units, and (c) cooling the resultant filaments with a liquid. The drawing-down units are submerged or partly-submerged in a liquid. The distance between the drawing-down units is smaller than the width of an assembly of the extruded filaments. Four surfaces of the assembly of the filaments are contacting the drawing-down units before or after the drawing-down units are submerged.

Abstract: A three-dimensional netted structure having an upper surface, a lower surface, two side surfaces a left end surface, and a right end surface, including at least a plurality of filaments helically and randomly entangled and thermally bonded together, wherein the filaments are formed out of a thermoplastic resin by extrusion molding followed by cooling with a liquid; and the netted structure is four-surface molded, the upper surface, the lower surface and the two side surfaces being molded. An apparatus and a method for manufacturing the three-dimensional netted structure.

Abstract: A three-dimensional netted structure having an upper surface, a lower surface, two side surfaces a left end surface, and a right end surface, including at least a plurality of filaments helically and randomly entangled and thermally bonded together, wherein the filaments are formed out of a thermoplastic resin by extrusion molding followed by cooling with a liquid; and the netted structure is four-surface molded, the upper surface, the lower surface and the two side surfaces being molded. An apparatus and a method for manufacturing the three-dimensional netted structure.

Abstract: A self resonance-type sound-producing speaker that is waterproof and readily attachable. The self resonance-type sound-producing speaker includes an actuator speaker unit and a polymer foam arranged to cover the entire outer surface of this speaker unit and converts the vibrations from the speaker unit into plane waves to externally produce sound. The polymer foam preferably has the expansion ratio of 10 to 30 times and the closed pore structure. The thickness of the polymer foam is preferably not less than 2 mm and is more preferably not less than 3 mm.

Abstract: A manufacturing apparatus of three-dimensional net-like structure includes: a nozzle with a plurality of extrusion holes that are arrayed to extrude and drop downward a thermoplastic synthetic resin in a molten state and thereby form a filament assembly of a plurality of filaments; a pair of chutes arranged across longitudinal faces of the filament assembly to have inclined surfaces that are sloped toward the filament assembly and opposed to each other across a distance that is less than a short side length of the array of the extrusion holes; water supply ports arranged to supply cooling water to the inclined surfaces; and a pair of haul-off machines configured to have endless belts arranged to be in contact with the longitudinal faces of the filament assembly and haul off the filament assembly and opposed to each other across a less distance than the distance between the pair of chutes.

Abstract: A method for forming cushions including the following four steps: (1) a compression step in which the structure (2) is compressed in a mold (3); (2) a thermal softening step in which the structure (2) is thermally softened by means of a heating medium; (3) a curing step in which the structure (2) directly undergoes forced cooling in a cooling medium, and is then cured; and (4) a mold release step in which the structure (2) is released from the mold (3).

Abstract: An apparatus for manufacturing a three-dimensional netted structure, the apparatus including: drawing-down units, the drawing-down units being submerged or partly-submerged in a liquid, and a die with a mouthpiece having a plurality of holes, the die adapted to extrude the filaments downward at a speed lower than the filament dropping speed whereby the filaments drop in between the drawing-down units. The distance between the drawing-down units is smaller than the width of the assembly of the extruded filaments. The drawing-down units are adapted to contact four surfaces of the assembly of the filaments before or after the drawing-down units are submerged.

Abstract: A method of manufacturing a three-dimensional netted structure by (a) extruding molten filaments of a thermoplastic resin downward from a die via a mouthpiece of the die having a plurality of holes such that the filaments drop under the force of gravity in between drawing-down units, (b) drawing down the assembly of extruded filaments at a speed lower than the filament dropping speed by the drawing-down units, and (c) cooling the resultant filaments with a liquid. The drawing-down units are submerged or partly-submerged in a liquid. The distance between the drawing-down units is smaller than the width of an assembly of the extruded filaments. Four surfaces of the assembly of the filaments are contacting the drawing-down units before or after the drawing-down units are submerged.

Abstract: A three-dimensional netted structure having an upper surface, a lower surface, two side surfaces a left end surface, and a right end surface, including at least a plurality of filaments helically and randomly entangled and thermally bonded together, wherein the filaments are formed out of a thermoplastic resin by extrusion molding followed by cooling with a liquid; and the netted structure is four-surface molded, the upper surface, the lower surface and the two side surfaces being molded. An apparatus and a method for manufacturing the three-dimensional netted structure.