摘要:
A method for forming seat cushions reduces the mold release time. A structure (2) is formed when three or four surfaces of four surfaces, excluding the two end surfaces in the extrusion direction thereof, cure. Normally, the density of the structure (2) is higher than other regions, and the structure (2) is provided with a total of six surfaces: a top surface, a bottom surface, a left surface and a right surface (see fig. 9 and 10 ), and two end surfaces that have been cut (see fig. 11 ). The structure (2) is formed according to a formation method comprising the following 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. (4) A mold release step in which the structure (2) is released from the mold (3).
摘要:
A method of and an apparatus for manufacturing a three-dimensional netted structure which is capable of rendering it unnecessary to carry out a finishing operation in a later stage, improving the degree of straightness of the side surfaces of the netted structure, meeting a demand for finishing the netted structure to modified shapes, and improving the durability of the netted structure. A three-dimensional netted structure (1) using thermoplastic resin as a raw material or a main raw material is characterized by a three-dimensional plate type netted structure, in which a plurality of filaments are helically and randomly entangled and partly and thermally bonded together. The density of any of at least three surfaces or four surfaces on the outer periphery of the three-dimensional netted structure is preferably relatively lower than the density of the other portion excluding these surfaces, and flaked or chipped PET bottles are used as a raw material or a main raw material for thermoplastic resin, such PET bottles being directly crushed and then melted to provide flakes, suiting to recycling promoting age, working well in waste disposal cost reduction, the uses of the three-dimensional netted structure (1) including, chiefly, shock absorbing materials, cushioning materials, and sound-absorbing materials.
摘要:
A method and device for producing a three-dimensional net-like structure which does not require finishing in the post-process, has an increased degree of alignment, makes it possible to cope with profiled cross sections, and has improved durability. A three-dimensional net-like structure (1) using thermoplastic resin as the raw or main raw material is a plate-like three-dimensional net-like structure characterized by comprising a plurality of filaments spirally indiscriminately entangled and locally welded. The density of any of at least three surfaces or four surfaces on the outer periphery of the three-dimensional net-like structure is preferably relatively lower than the density of the other portion excluding these surfaces, and flakes or chips of PET bottles are used as the raw or main raw material for thermoplastic resin, such PET bottles being directly crushed and then melted to provide flakes, answering the needs of the times for promotion of recycle, working well in waste disposal cost reduction, the uses of the three-dimensional net-like structure (1) including, chiefly, shock absorbers, cushioning materials, and sound-absorbing building materials.
摘要:
An object is to provide a hygienic cushion that has an adequate thickness to provide the repulsive force of or above a specified level and the body-holding property, is light in weight, has excellent air permeability and is washable with water. The core material for cushion 1 comprising the three-dimensional net-like structure, which is comprised of a polyethylene thermoplastic resin, a polyester thermoplastic elastomer or a mixture of a polyethylene thermoplastic resin and a polyethylene thermoplastic elastomer. The three-dimensional net-like structure has a first layer that includes a thermoplastic resin and a second layer that is stacked on a single surface or both surfaces of the first layer and includes a thermoplastic resin different from the thermoplastic resin of the first layer. The three dimensional net-like structure has an impact resilience of not lower than 13 cm, a hysteresis loss of not higher than 34% and not lower than 13%, and a thermal expansion rate of 0 to 8% in the longitudinal direction before and after a hot-air drying test that is performed at a temperature of 90°C for 30 minutes with regard to the polyethylene thermoplastic resin, that is performed at a temperature of 130°C for 30 minutes with regard to the polyester thermoplastic elastomer and that is performed at a temperature of 90°C for 30 minutes with regard to the mixture of the polyethylene thermoplastic resin and the polyethylene thermoplastic elastomer.
摘要:
A method for forming seat cushions reduces the mold release time. A structure (2) is formed when three or four surfaces of four surfaces, excluding the two end surfaces in the extrusion direction thereof, cure. Normally, the density of the structure (2) is higher than other regions, and the structure (2) is provided with a total of six surfaces: a top surface, a bottom surface, a left surface and a right surface (see fig. 9 and 10 ), and two end surfaces that have been cut (see fig. 11 ). The structure (2) is formed according to a formation method comprising the following 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. (4) A mold release step in which the structure (2) is released from the mold (3).
摘要:
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 and 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 46a and 46b, while being cooled down with water supplied from openings 51a, 51b and 51c.
摘要:
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 and 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 46a and 46b, while being cooled down with water supplied from openings 51a, 51b and 51c.
摘要:
A three-dimensional striped structure is provided which is formed by bonding continuous filaments in random in loops, has a longitudinal direction corresponding to an extruding direction, a lateral direction and a thickness direction perpendicular to the extruding direction, and is comprised of a polyethylene thermoplastic resin, a polyester thermoplastic elastomer or a mixture of a polyethylene thermoplastic resin and a polyethylene thermoplastic elastomer. The three dimensional striped structure has an impact resilience of not lower than 13 cm, a hysteresis loss of not higher than 34% and not lower than 13%, and a thermal expansion rate of 0 to 8% in the longitudinal direction before and after a hot-air drying test, and does not shrink during high-temperature sterilization