JPH0716975A - Laminated structure - Google Patents

Abstract

PURPOSE:To provide a laminated structure which is superior in heat resistance, durability and cushioning properties, suitable for a material, hard to become stuffy and capable of recycling. CONSTITUTION:A laminated structure is comprised by a method wherein nonwoven fabric comprised of polyester and/or knit fabric is comprised by being laminated and integrated on at least one surface of a netlike structural body which is comprised by fusing partly a continuous linear body fiber comprised of thermoplastic fiber having at least 100 deniers and apparent density of 0.005-0.20g/cm<3>. Hereby, since the laminated structure is suitable for a cushioning material which is free from floor striking feeling, hard to become stuffy, comfortable to sit on, driving for a long time can be performed comfortably even if it is used for a vehicular seat, hard to be dejected even for a long term use and easy for recycling, it is useful for a ship's seat or a cushion for furniture or padding cotton for a bedding article other than the vehicular seat. Furthermore, it can be used for use of also elastic nonwoven fabric by various processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated structure having durability and cushioning properties suitable for furniture, beds, cushioning materials for vehicles, heat insulating materials and the like.

[0002]

2. Description of the Related Art Currently, it is used as a cushion material for furniture, beds, trains, automobiles, etc., using urethane foam, non-elastic crimped fiber wadding,
In addition, resin cotton or hard cotton to which non-elastic crimped fibers are adhered is used.

However, although the foamed-crosslinked urethane has good durability as a cushioning material, it is apt to be stuffy due to its poor moisture permeability and heat storage and has a heat storage property, and it is difficult to recycle because it is not thermoplastic, and is burned. The damage to the incinerator is large and the cost for removing toxic gas is high.
For this reason, landfilling has become more frequent, but it is difficult to stabilize the ground, and there is a problem that landfilling sites are limited and costs increase. Further, although it has excellent processability, it also has a problem of pollution of chemicals used during manufacturing. In addition, since the fibers are not fixed in the thermoplastic polyester fiber wadding, the form may collapse during use, the fibers may move, and the crimp may cause a decrease in bulkiness and elasticity. become.

As a resin cotton in which polyester fibers are adhered with an adhesive, for example, a rubber-based adhesive is used, Japanese Patent Application Laid-Open No.
0-11352, JP-A 61-141388, JP-A 61-141391 and the like. Further, as a method using a cross-linkable urethane, JP-A-61-1377
No. 32 publication and the like. These cushion materials have inferior durability, and also have problems such as not being recyclable because they are neither thermoplastic nor single composition, and there are problems such as complexity of processability and pollution of chemicals used during manufacturing. .

Polyester hard cotton, for example, JP-A-58-3
1150, JP-A-2-154050, JP-A-3-220354, etc., but since an amorphous polymer having a brittle adhesive component of the heat-bonding fiber used is used (for example, JP-A-58). -136828, Japanese Patent Application Laid-Open No. 3-
However, there is a problem in that durability is poor such that the bonded portion is brittle and the bonded portion is easily broken during use and the form and elasticity are reduced. As an improved method, a method of entanglement treatment has been proposed in Japanese Patent Laid-Open No. 4-245965, but there is a problem that the brittleness of the bonded portion is not solved and the elasticity is largely reduced. In addition, there is complexity during processing. Further, there is a problem that the bonded portion is hard to be deformed and soft cushioning is hard to be imparted. Therefore, a heat-bonding fiber using a polyester elastomer which is soft and recovers even if it is deformed is disclosed in JP-A-4-240219, and a cushion material using the fiber is disclosed in WO-91 / 19032. Proposed. The adhesive component used in this fiber structure contains 50 to 80 mol% of terephthalic acid in the acid component of the hard segment of polyester elastomer, and the content of polyalkylene glycol as the soft segment is 30 to 50% by weight. If the melting point is 180 ° C. or lower as the composition of other acid components if the content of% is limited,
Since it is recognized that it is the same as the fiber described in the publication, it contains isophthalic acid and the like to increase the non-crystallinity, and the low melt viscosity improves the formation of the heat-bonded portion to form an amoeber-like bonded portion. However, there is a problem that the heat resistance and compression resistance are deteriorated due to plastic deformation.

A thermoplastic olefin network used for civil engineering work is disclosed in JP-A-47-44839. However, unlike a cushion made of fine fibers, the surface is uneven and the touch is poor, and since the material is olefin, the heat resistance durability is extremely poor and it cannot be used as a cushion material. Therefore, as an improved method, actual Kaihei 1-1684
A method of forming a laminate with a non-woven fabric or a woven fabric is proposed in Japanese Patent No. 8 or the like. This proposal is inadequate as a cushion material for a seat because it is laminated on a net-like body made of a non-elastic resin and having a large number of peaks and troughs, so that it has poor heat resistance and compression recovery. In addition, it is difficult to recycle due to the combination of different materials.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and provides a laminated structure which is excellent in heat resistance, durability and cushioning property, and which is suitable for a stuffy cushioning material and which can be easily recycled. To do.

[0008]

[Means for Solving the Problems] Means for solving the above problems, that is, the present invention has a continuous linear fiber made of a thermoplastic resin having a denier of 100 denier or more partially fused, and has an apparent density of A non-woven fabric and / or a knitted woven fabric made of polyester are laminated and integrated on at least one surface of a 0.005-0.20 g / cm ³ network structure.

The thermoplastic elastic resin in the present invention is block-copolymerized with a soft segment, such as polyether glycol, polyester glycol, or polycarbonate glycol having a molecular weight of 300 to 5000. Polyester elastomer, polyamide elastomer,
Examples include polyurethane elastomers. By using a thermoplastic elastic resin, it becomes possible to regenerate by remelting, and thus recycling becomes easy. Since the network structure is laminated and integrated with the non-woven fabric made of polyester and / or the knitted fabric, it is preferable to use the thermoplastic elastomer resin mainly composed of polyester elastomer. As a preferable composition of the network structure constituting the laminate of the present invention, for example, a polyester ether block copolymer having a thermoplastic polyester as a hard segment and a polyalkylenediol as a soft segment, or a fat Examples thereof include polyester ester block copolymers containing a group polyester as a soft segment. More specific examples of polyester ether block copolymers include terephthalic acid, isophthalic acid, naphthalene 2.6 dicarboxylic acid, naphthalene 2.7 dicarboxylic acid, diphenyl 4.
Aromatic dicarboxylic acids such as 4'dicarboxylic acid, alicyclic dicarboxylic acids such as 1.4 cyclohexanedicarboxylic acid, aliphatic dicarboxylic acids such as succinic acid, adipic acid and sebacic acid dimer acid, or ester-forming derivatives thereof Such as at least one dicarboxylic acid selected from the following: 1.4 butanediol, ethylene glycol, trimethylene glycol, tetremethylene glycol, pentamethylene glycol, hexamethylene glycol, etc. Aliphatic geo-
At least one diol component selected from alicyclic diols such as 1,1,1-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, and ester-forming derivatives thereof, and Average molecular weight is about 300-5
Is a ternary block copolymer composed of at least one polyalkylene glycol such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and ethylene oxide-propylene oxide copolymer. . The polyester ester block copolymer is a ternary block copolymer composed of at least one of the above dicarboxylic acids, diol, and polyester diol such as polylactone having an average molecular weight of about 300 to 3,000. . Considering heat adhesion, hydrolysis resistance, stretchability, heat resistance, etc., terephthalic acid as dicarboxylic acid, or naphthalene 2.6 dicarboxylic acid, and 1.4 butanedio as diole component.
Polytetramethylene glycol ternary block copolymers are preferred as the polyol and polyalkylene diol, and polylactone ternary block copolymers are particularly preferred as the polyester diol. In a special case, it is possible to use the one in which a polysiloxane-based soft segment is introduced.
Also, the thermoplastic elastomer resin of the present invention includes those obtained by blending the above elastomer with a non-elastomer component and those obtained by copolymerization.

The melting point of the thermoplastic elastic resin of the present invention is preferably 140 ° C. or higher where heat resistance and durability can be maintained, and it is more preferable to use a resin having a melting point of 160 ° C. or higher because heat resistance and durability are improved. If necessary, an antioxidant, a light-proofing agent or the like may be added to improve durability.

The continuous linear fibers constituting the network structure of the present invention preferably have an endothermic peak below the melting point in the melting curve measured by a differential scanning calorimeter. Those having an endothermic peak below the melting point have significantly improved heat resistance and sag resistance than those having no endothermic peak. Although the reason for this is not clear, it is considered that a pseudo-crystallization-like cross-linking point is formed and the heat resistance and sag resistance is improved. For example, a preferable polyester elastomer of the present invention contains 90 mol% or more of terephthalic acid or naphthalene2.6 * carboxylic acid as an acid component, and more preferably contains terephthalic acid or naphthalene2.6 dicarboxylic acid. Is 95 mol% or more, particularly preferably 100 mol%, after transesterification of the glycol component to polymerize to a required degree of polymerization, and then as a polyalkylene diol, preferably having an average molecular weight of 500 or more and 5000 or less, particularly Preferably, when terephthalic acid or naphthalene 2.6 dicarboxylic acid is copolymerized with polytetramethylene glycol in an amount of 1,000 to 3,000 in an amount of 15% to 70% by weight, more preferably 30% to 60% by weight. If the content of is large, the crystallinity of the hard segment is improved and it is difficult for plastic deformation. And is improved sexual sag resistant anti, even at least 10 ° C. than the melting point after melting heat-bonding
If the annealing treatment is performed at a lower temperature, the heat resistance and sag resistance are further improved. In this case, the differential scanning calorimeter (DS
In the melting curve according to C), an endothermic peak appears more clearly at a temperature below the melting point. By analogy with this,
Unring rearranges the hard segments,
It is considered that a pseudo-crystallization-like cross-linking point is formed and the heat resistance and sag resistance is improved.

In the net-like structure constituting the laminated structure of the present invention, the fibers made of the thermoplastic elastic resin are fused together to form a three-dimensional net-like structure. As a result, even if a large amount of deformation is applied with a very large stress, the entire fused and integrated three-dimensional network structure deforms and absorbs the stress, and when the stress is released, the rubber elasticity of the elastic resin develops. Thus, the structure can be restored to its original form. A known cushioning material containing fibers made of an inelastic resin is plastically deformed, and since such recovery does not occur, heat resistance and durability are deteriorated. If they are not fused, the shape cannot be maintained and the structure does not deform integrally, so that fatigue phenomenon occurs due to stress concentration and durability deteriorates, and at the same time, the shape deforms, which is not preferable. The more preferable degree of fusion of the present invention is that most of the portions in contact with the fibers are fused, and most preferably all the contacted portions are fused.
The fineness of the continuous linear body of the present invention is 100 to 100,000.
Denier, more preferably 300 to 50,000 denier. The cross-sectional shape is not particularly limited, but when a fine fine fiber is used, a modified cross section or a hollow cross section is preferable because the repulsive force is improved.

[0013] Fibers made of thermoplastic elastomeric resin of the present invention, the apparent density of the network structure of the fibers are fused is 0.005 g / cm ³ or more and 0.20 g / cm ³ or less.
If the apparent density is less than 0.005 g / cm ³ , the repulsive force will be lost, so it is not suitable as a cushioning material.
If it exceeds ³ cm, the elasticity is increased and the comfort of sitting becomes poor, making it unsuitable as a cushioning material. The preferred apparent density of the present invention is 0.005 to 0.10 g / cm ³ ,
More preferably, it is 0.01 to 0.05 g / cm ³ . The thickness of the net-like structure is not particularly limited, but it is preferably 3 mm or more so that the function as a cushion body is easily exhibited. In addition, it is preferable that the surface of the net-like structure has substantially no unevenness in order not to give a feeling of foreign matter when it is formed into a laminate and to prevent stress concentration on the nonwoven fabric and / or the knitted fabric.

In the laminated structure of the present invention, at least one surface of the reticulated structure is laminated and integrated with a non-woven fabric made of polyester and / or a knitted fabric, so that the reticulated structure has good breathable and breathable properties and good breathable and breathable properties. Since it is laminated and integrated with a non-woven fabric and / or a knitted fabric, it can be prevented from getting stuffy when used as a seat, and can be recycled without being separated, except for the frame of the seat. In the laminate of the present invention, it is preferable that the back surface in contact with the spring is laminated with a reinforcing non-woven fabric, and the front surface is a soft cotton non-woven fabric with a soft touch, and the side material is laminated thereon to be integrated. The reinforcing non-woven fabric and the mesh are laminated and heat-bonded with a non-woven fabric containing heat-bonding fibers,
The surface is made by laminating heat-bonded soft cotton non-woven fabric and mesh, and between the hard cotton non-woven fabric and the side ground with a non-woven fabric containing elastic polyester-based heat-bonding fibers to integrate them by thermobonding, or a slightly hard mesh structure. It is more preferable that non-woven fabrics containing elastic polyester thermal bonding fibers are laminated and bonded between the body and the soft network structure, and between the soft network structure and the lateral sides. Lamination of a film or a foam such as polyurethane having closed cells having excellent durability is not preferable because the breathable moisture permeability is deteriorated and steaming tends to occur. It is a particularly preferred embodiment because the hard cotton non-woven fabric to be laminated also contains the elastic polyester-based thermo-adhesive fiber because the heat resistance durability and the cushioning property are further improved. When a generally known non-elastic polyester-based heat-bonding fiber is used, it is preferable to use a heat-bonding component having as little amorphous as possible. In addition, the polyester nonwoven fabric referred to in the present invention is a spunbond made of polyester obtained by a known method, a long fiber nonwoven fabric subjected to an entanglement treatment obtained by melt blow or bonded without being entangled, and a polyester short fiber are opened. After that,
Includes a heat-bonded nonwoven fabric obtained by entanglement treatment such as cloth and needle punching, or a resin bond, a heat-bonded nonwoven fabric bonded by a heat-bonded fiber, or a nonwoven fabric obtained by a papermaking method. The heat-bonded non-woven fabric includes a thick hard cotton non-woven fabric, a heat-bonded fiber made of only heat-bonded fiber, and the like.

A method for producing a reticulated structure made of a thermoplastic elastic resin is a method in which a plurality of thermoplastic elastic resins obtained by a known method such as JP-A-55-120626 are melted by using a general melt extruder. When the nozzle is discharged downward from the nozzle having the orifice and is naturally dropped, the discharge filament swirls to form a loop. At this time, the loop diameter and the wire diameter are determined by the distance between the nozzle surface and the take-up conveyor installed on the cooling medium that solidifies the resin, the melt viscosity of the resin, the hole diameter of the orifice and the discharge amount, and the like. Then, the melted discharge filaments are sandwiched and retained by a pair of take-up conveyors with adjustable intervals installed on the cooling medium to fuse the portions in contact with each other and continuously draw in the cooling medium to solidify. Form a network structure. By adjusting the interval of the conveyor,
The thickness can be adjusted while the fused network is in a molten state, and a desired thickness can be obtained. If the conveyor speed is too fast, it will be cooled before fusion and the contact part will not be fused. Further, if the speed is too slow, the melt will stay too much and the density will increase, so it is necessary to set the conveyor speed suitable for the desired apparent density. Preferably then
Alternatively, a pseudo crystallization process is separately performed. In this process, the pseudo crystallization process can be performed simultaneously with cooling by setting the temperature of the cooling medium to the annealing temperature. When the drying step is performed after cooling once, the pseudo crystallization treatment can be performed at the same time by setting the drying temperature to the annealing temperature.
In addition, a pseudo crystallization process can be performed separately. Then, it is cut into a desired length and used as a cushion material. The pseudo-crystallization treatment temperature is at least 10 ° C. lower than the melting point (Tm), and is higher than the α dispersion rising temperature (Tαcr) of Tan δ. This treatment has an endothermic peak below the melting point and does not have pseudo-crystallization treatment (no endothermic peak)
The heat resistance and sag resistance are remarkably improved. The preferred pseudo-crystallization treatment temperature of the present invention is from (Tαcr + 10 ° C.) to (Tαcr + 10 ° C.).
m-20 ° C). When the net-like structure is used for the cushion layer, the purpose of use, the resin used depending on the site,
It is necessary to select the fineness, the loop diameter, and the bulk density. For example, when used as a surface wadding layer, it is preferable to have a low density, a fine fineness, and a fine loop diameter in order to give a soft touch, an appropriate subsidence, and a bulge with tension. For the layer, the resonance frequency is lowered, the hardness and the hysteresis at the time of compression are changed linearly to improve the body retention, and in order to maintain the durability, medium density, thick fineness and slightly large -Preferable diameter. Further, it can be molded into a shape suitable for the purpose of use by using a molding die or the like to the extent that the three-dimensional structure is not damaged. In addition, at any stage from the manufacturing process to processing into a molded body, it is possible to perform processing such as addition of chemicals to impart functions such as flame retardancy, insect repellent antibacterial, heat resistance, water / oil repellency, coloring, and aroma.

The laminated structure of the present invention is obtained by laminating and integrating a non-woven fabric and / or a knitted fabric on the net-like structure obtained by the above-mentioned manufacturing method. Nonwoven fabrics and knitted fabrics made of polyester can be obtained by known methods. A nonwoven fabric made of polyester elastomer is also disclosed in, for example, JP-A-63 / 1988.
A spunbonded non-woven fabric can be obtained by the production method of No. -12746, and a melt-blown non-woven fabric can be obtained by the production method of Japanese Unexamined Patent Publication No. 3-119164. As the short fiber non-woven fabric, it is possible to obtain a hard cotton non-woven fabric having good heat resistance and durability using an elastomer-based heat-bonding fiber by a method such as Japanese Patent Application No. 4-340483 or Japanese Patent Application No. 4-342577. it can. As a preferred embodiment of the present invention, from the surface, polyester side material-meltblown non-woven fabric made of elastomer-elastomer-hard cotton non-woven fabric having good heat resistance using thermal adhesive fibers-meltblown non-woven fabric made of elastomer -Melt-blown non-woven fabric-elastomer-polyethylene terephthalate (PE
T) Laminated with spunbonded non-woven fabric, compressed to the required thickness, and thermoformed at a temperature 10 ° C to 25 ° C higher than the melting point of the meltblown non-woven fabric made of elastomer to be integrated or to be integrated except for the side fabric. After conversion, side ground may be attached. In this way, by thermal bonding and integration with an elastomer, the structure is recovered even if it is deformed, and the shape retention is remarkably improved. Then, it may be laminated without being heat-bonded, and the laminated structure may be covered with the side material to be integrated. Further, it can be molded into a shape suitable for the intended purpose by using a molding die or the like. In addition, at any stage from the manufacturing process to processing into a molded body, it is possible to perform processing such as addition of chemicals to impart functions such as flame retardancy, insect repellent antibacterial, heat resistance, water / oil repellency, coloring, and aroma.

[0017]

EXAMPLES The present invention will be described in detail below with reference to examples.

The evaluations in the examples were carried out by the following methods. Endothermic peak (melting peak) from melting point (Tm) and endothermic peak below melting point TA50, DSC50 type differential thermal analyzer manufactured by Shimadzu ) The temperature was determined. Using Tαcr Orientec Vibron DDVII type, 11
Equivalent to the transition temperature from the rubber elastic region to the melting region of Tan δ (the ratio M ″ / M ′ between the imaginary elastic modulus M ″ and the real part M ′ of the elastic modulus) measured at 0 Hz and a temperature rising rate of 1 ° C./min. To α
Dispersion rising temperature. Apparent bulk density The sample is cut into a size of 15 cm × 15 cm, the heights at four positions are measured, the volume is determined, and the weight of the sample is divided by the volume. (Average value of n = 4) Heat resistance and durability (residual strain at 70 ° C) The sample was cut into a size of 15 cm x 15 cm, compressed by 50%, allowed to stand in dry heat at 70 ° C for 22 hours, and then cooled to remove compression strain. The ratio of the thickness after standing for one day to the thickness before processing is shown in% (n =
Average value of 3) Cyclic compression strain A sample was cut into a size of 15 cm x 15 cm, and a Shimadzu servo pulsar 50% was used at 25 ° C and 65% RH room.
The compression recovery was repeated at a cycle of 1 Hz to the thickness of 20,000 times, and the ratio of the thickness of the sample after standing 20,000 times to the thickness before treatment was%.
Indicate. (Average value of n = 3) 50% compression repulsion force A sample was cut into a size of 20 cm × 20 cm, and was compressed to 65% with a φ150 compression plate using a Tensilon manufactured by Orientec Co., Ltd. Repulsive force at 50% compression is shown. (Average value of n = 3) Ride comfort Set the integrally laminated seat on the seat frame of an automobile, and let the panelists drive five hours each for 4 hours to make sensory evaluations of the following points. The average value was evaluated. (1) Feeling of floor: None (good), a little (small), a little (medium), remarkable (large) (2) Tumbling: None, a little (small), a little (medium), remarkable ( Large) (3) Cushioning property: good (◎), no pain for about 2 hours (○), vibration is felt but can be endured for about 1 hour (△), direct vibration can not be endured for 30 minutes (×) Resistance Sagging: A Shimazu Seisakusho pulsar-presses a spherical weight with a compression load of 100 kg against the center of the seat 200,000 times at 1 Hz, and the degree of sagging is 10% or less due to the reduction in thickness (◎). , 20% or less (○), 30% or less (△), 30%
The evaluation was made based on the above criteria (x). Reinforcing thread When removing the frame of the seat, crushing the seat and drying it.
Melted at 285 ° C from a 2 mm orifice and the discharge rate was 0.
Melt-spin for 4 hours at 5 g / minute hole, take-up speed of 1300 m / min, and measure the number of yarn breakages: 0 times (⊚), 2 times or less (○), 5 times or less (△), 5 times or more Evaluation was made according to the criteria of (x).

EXAMPLE Dimethyl terephthalate (DMT) and 1.4 butanediol (1.4 BD) were charged with a small amount of a catalyst, and after transesterification by a conventional method, polytetramethylene glycol (PTMG) having a molecular weight of 2000 was prepared. ) Is added and polycondensation is performed while heating and decompressing to generate a polyester ester block copolymer elastomer having a melting point of 179 ° C. and Tαcr58 ° C., and then 1% of an antioxidant is added and mixed and kneaded into pellets. The thermoplastic elastic resin raw material obtained by liquefying and vacuum drying at 50 ° C. for 48 hours has a width of 50 cm and a length of 5 cm, and orifices with a hole diameter of 0.5 mm are arranged at a pitch of 5 mm on the effective surface of the nozzle. The discharge rate was changed to 1.5 g / min for discharge, cooling water was placed 50 cm below the nozzle surface, and stainless steel endless nets with a width of 60 cm were arranged in parallel at 5 cm intervals. The take-out conveyor is placed on the water surface so that it partially comes out, and is drawn, and while fusing the contact parts, both sides are sandwiched and drawn into the cooling water heated to 70 ° C at a speed of 1 m / min to solidify, After crystallization treatment, cut into a predetermined size and apparent density 0.03 g / cm ³ , 70 ° C residual strain 9
%, Cyclic compression strain 1.4%, Repulsive force at 50% compression 3
0 kg of reticulated structure (reticulated structure No. A-1) was obtained.

An apparent density of 0.003 g / cm ³ and a residual strain of 7.4% at 70 ° C. were obtained in the same manner as in A-1, except that the discharge rate was 0.3 g / min and the take-up conveyor speed was 2 m / min. ,
A reticulated structure (reticulated structure No. A-2) having a repetitive compressive strain of 1.2% and a repulsive force of 4 kg when compressed at 50% was obtained.

A net-like structure having an apparent density of 0.30 g / cm ³ (net-like structure N) was obtained in the same manner as A-1, except that the discharge rate was 6.8 g / min and the take-up conveyor speed was 50 cm / min.
o.A-3) was obtained.

A single hole discharge rate of 15 g / min is obtained from a nozzle in which polypropylene (PP) of melt index 50 is 50 cm in width and 5 cm in length, and orifices having a hole diameter of 0.5 mm are arranged at an interval of 5 mm. The cooling water is placed 50 cm below the nozzle surface, and stainless steel endless nets with a width of 60 cm are placed in parallel at intervals of 5 cm so that a pair of take-up conveyors are partially exposed above the water surface and then taken into contact. While fusing the parts together, sandwiching both sides and pulling into cooling water at 20 ° C at a speed of 1 m / min to solidify, cut into a predetermined size and an apparent density of 0.35 g / cm ³ , 70 ° C.
Residual strain 48.6%, cyclic compression strain 29.3%, 50
% Repulsive force at compression 182 kg reticulated structure (reticulated structure No.
A-4) was obtained.

4 Denier obtained by a conventional method using the polyether ester block copolymer elastomer used in A-1 as a sheath component and polyethylene terephthalate (PET) as a core component (50/50 weight ratio). -Using a heat-bonded fiber and a PET having an intrinsic viscosity of 0.63, a fineness of 6 denier having a three-dimensional crimp obtained by a conventional method, an initial tensile resistance of 40 g / denier, and a short fiber having a hollow cross section are used. 30/70 weight ratio mixed fiber,
After opening and stacking with a card, compress and press with hot air at 205 ° C for 5
After bonding for a minute, cool once, then compress by 50%,
Apparent density 0.02 g / cm ³ , obtained by pseudo crystallization treatment with hot air at 100 ° C. for 15 minutes, residual strain at 70 ° C. 18.3%,
Repetitive compressive strain 2.6%, repulsive force 12kg at 50% compression
A hard cotton non-woven fabric (non-woven fabric No. B-1) having good heat resistance and durability was obtained using the above-mentioned elastomer-based heat-adhesive fiber.

DMT and hexanediol (HD) and 1
・ 4BD was charged with a small amount of catalyst, and after transesterification by a conventional method, 78% by weight of PTMG having a molecular weight of 3000 was added to cause polycondensation while heating and decompressing, and a melting point of 142 ° C.
To generate a terester block copolymer elastomer,
Then add 1% of antioxidant and knead into pellets,
The thermoplastic elastic resin raw material obtained by vacuum drying at 40 ° C. for 48 hours was used to obtain a melt blown nonwoven fabric (nonwoven fabric No. C-1) having a basis weight of 15 g / m ² by a conventional method.

Melt index 25 polyethylene (P
E) as a sheath component, PP of melt index 50 as the core component (50/50 weight ratio) of propylene, and 4 denier heat-bonded fibers obtained by a conventional method and PE having an intrinsic viscosity of 0.63.
Using T, a fineness of 6 denier having a three-dimensional crimp obtained by a conventional method, an initial tensile resistance of 40 g / denier, and a short cross-section fiber having a hollow cross section were mixed at a weight ratio of 30/70, and the mixture was carded. Opening-
After lamination, compression and compression treatment with hot air at 140 ° C. for 5 minutes gave an apparent density of 0.02 g / cm ³ and residual strain of 70 ° C. 47.
A hard cotton non-woven fabric (non-woven fabric No. B-2) using 8%, repetitive compressive strain of 17.2%, and repulsive force at the time of 50% compression of 8 kg was obtained.

A melt-blown non-woven fabric (non-woven fabric) having a basis weight of 15 g / m ² was prepared by a conventional method using PE of melt index 25.
No. C-2) was obtained.

A large number of holes were punched in a seat female die having a large number of holes so that the non-woven fabric B was laminated on the mesh structure together with metal fittings for stopping the ground through the non-woven fabric C. Compressed with a male seat die and the melting point of the non-woven fabric C is 10
It was treated with hot air at a high temperature of 5 ° C for 5 minutes to obtain a laminated body in the form of a seat. Next, the laminated body with the side cloth covered was attached to the seat frame, and the sitting comfort and durability were evaluated. For comparison, a laminate was also prepared in which a foamed polyurethane wadding layer was attached with an adhesive to a seat structure only for the net-like structure, and similarly attached to the seat and evaluated. Table 1 shows the structure of the laminate and the evaluation results. Further, a laminated body in which the non-woven fabric C is laminated between the non-woven fabric B and the side fabric and integrally molded with the side fabric, and the evaluation results are also shown in Table 1.

[0028]

[Table 1]

Examples 1 and 2 satisfying the requirements of the present invention were laminated structures suitable for seats having no floor feeling, less stuffiness, good cushioning properties, and excellent satiety resistance. Comparative Example 1 is an example in which a low-density mesh structure is used, and since the subsidence is large, the feeling of flooring, the feeling of stuffiness, and the cushioning property are extremely poor. In Comparative Example 2, the density of the net-like structure is too high and it becomes hard, and the feeling of flooring, the feeling of stuffiness, and the cushioning property are extremely poor. In Comparative Example 3, the net-like structure is made of non-elastic resin fibers, so that the material is hard and has a significantly poor feeling of flooring, stuffiness, and cushioning properties, and further, has a very poor sag resistance and is difficult to reproduce. Here is an example. In Comparative Example 4, the reticulated structure is made of non-elastic resin fibers, and the laminated non-woven fabric is of the same quality as the reticulated structure but different from the side material, so that it is hard and has a significantly poor flooring feeling, stuffiness, and cushioning property. Is an example of a material that is extremely inferior in sag resistance and difficult to reproduce. Comparative Example 5 is an example in which the reticulated structure is made of elastomer, but the laminated nonwoven fabric is not made of polyester, so that it is easy to feel stuffiness and reproduction is difficult. Comparative Example 6 is an example in which polyurethane is laminated instead of the polyester nonwoven fabric, so that it is extremely stuffy and difficult to regenerate.

[0030]

EFFECTS OF THE INVENTION The laminated structure of the present invention is suitable for a cushioning material that does not have a feeling of flooring, is stuffy, and is comfortable to sit on. Since it is a laminated structure that is comfortable, difficult to wear down for a long period of time, and easy to recycle, it is useful not only for vehicle seats, but also for boat seats, furniture cushions, cotton padding for bedding products, and the like.

Claims (1)

[Claims] 1. A reticulated structure having an apparent density of 0.005 to 0.20 g / cm ^{3 formed on} at least one surface of a continuous linear fiber made of a thermoplastic resin having a denier of 100 denier or more, which is partially fused. A laminated structure comprising a nonwoven fabric and / or a knitted fabric made of polyester, which are laminated and integrated.