JPH07238460A - Laminated elastic structure, its production and product using the same - Google Patents

Abstract

PURPOSE:To obtain a laminated elastic structure capable of blocking vibration, excellent in heat durability, shape-retaining property and cushioning property, hardly causing stuffiness and constituted of a network material obtained by laminating and joining a short fiber hard stock consisting of a thermoplastic elastic resin and most suitable as a cushioning material and to provide a method for producing the laminated elastic structure and to obtain a product such as quilt or cushion for furniture, beds and vehicles using the laminated elastic structure. CONSTITUTION:In this laminated elastic structure, nonwoven fabric, obtained by opening a short fiber consisting of a thermoplastic elastic resin and having $20 denier fineness and forming the short fiber in three-dimensional structure, in which most of the contact part of the yarns is fused by heat bonding and the face is flatted is joined and integrated on one side of a network material obtained by meandering continuous yarn consisting of a thermoplastic elastic resin having 100-100000 denier fineness, mutually contacting the yarn to form a three-dimensional structure and substantially flatting both faces of the structure. The laminated elastic structure has 0.01-0.2g/cm<2> density. Furthermore, this method for producing the laminated elastic structure and this product using the laminated elastic structure are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention provides a net body having excellent cushioning properties, heat resistance durability, and vibration absorption properties, and a recyclable short fiber hard cotton layer laminated and joined together, which is made of a thermoplastic elastic resin. The present invention relates to a laminated net body, a manufacturing method thereof, and products such as a futon, furniture, a bed, and a cushioning material for vehicles using the laminated net body.

[0002]

2. Description of the Related Art At present, as a cushion material for furniture, beds, trains, automobiles, etc., 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 very good durability as a wadding layer or a cushioning material, it has poor moisture permeability and heat storage property and is apt to be stuffy.
Moreover, since it is not thermoplastic, it becomes difficult to recycle, and when it is incinerated, the damage to the incinerator is large and the cost for removing the 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. For this reason, the polyester elastomer that is soft even at the bonded portion and recovers even if it is deformed to some extent
A heat-bonding fiber using a non-elastic polyester as a core component is disclosed in JP-A-4-240219, and a cushion material using the fiber is disclosed in WO-91 / 19032, JP-A-5-155651. It is proposed in Japanese Patent Laid-Open No. 5-163654. The adhesive component used in this fiber structure has a polyalkylene glycol content of 30 to 50 as a soft segment of polyester elastomer.
Wt%, 5% terephthalic acid as the acid component of the hard segment
It contains 0 to 80 mol% and is used as another acid component composition
As in the fiber described in Japanese Patent Publication No. 0-1404, isophthalic acid is contained to increase the amorphous property, and the melting point is 180.
The temperature is below ℃, and the heat-bonded part is well formed with a low melt viscosity to form an ameber-shaped bonded part, but it is easy to plastically deform, and because the core component is an inelastic polyester, plastic deformation especially under heating Becomes remarkable, and there is a problem that the heat resistance and compression resistance are lowered. As an improved method for these, Japanese Patent Laid-Open No.
No. 163654 proposes a structure consisting only of a polyester elastomer containing isophthalic acid as a sheath component and a heat-bonding composite fiber using an inelastic polyester as a core component. Plastic deformation becomes significant, the heat resistance and compression resistance deteriorate, and there is a problem in using it for a wadding layer or a cushion material. On the other hand, there is a method in which a silicone oil is added to a base material of hard cotton to lower the friction coefficient of fibers to improve the durability and improve the texture.
It is proposed in Japanese Patent No. 158094. However, there is a problem with the adhesiveness of the heat-adhesive fiber and the durability is poor, so it is not preferable for use in a wadding layer or cushioning material.

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 wadding layer or cushion material. In addition, Japanese Patent Publication No. 3-1766
No. 6 discloses a method in which ejection filaments having different fineness are fused to each other to form a mold, but the mesh structure is not suitable as a cushion material. Japanese Examined Patent Publication No. 3-55583 discloses that
A method of thinning only a very surface with a thinning device such as a rotating body before cooling is described. With this method, the surface cannot be flattened and a thick thin linear layer cannot be formed. Therefore, it does not provide a comfortable cushioning material. Japanese Patent Application Laid-Open No. 1-207462 discloses a vinyl chloride floor mat, but it is not preferable as a wadding material or a cushioning material because it has poor compression recovery at room temperature and remarkably poor heat resistance. is there. Note that no consideration is given to vibration damping in the above-mentioned structure.

[0007]

To solve the above problems,
Optimal for cushioning material composed of reticulated body made of thermoplastic elastic resin that is laminated and joined with short fiber hard cotton made of thermoplastic elastic resin that has excellent heat resistance and durability, shape retention and cushioning properties Another object of the present invention is to provide a laminated elastic structure and a manufacturing method, and a product and a manufacturing method using the laminated elastic structure, such as a futon, furniture, bed, and cushion for a vehicle.

[0008]

Means for Solving the Problems The means for solving the above problems, that is, the present invention, is to make continuous filaments made of a thermoplastic elastic resin having a fineness of 100 to 100,000 denier meander and contact each other. A short fiber having a fineness of 20 denier or less is formed of a thermoplastic elastic resin on one surface of a mesh body in which most of the contact portion is fused to form a three-dimensional structure, and both surfaces are substantially flattened. Opened three-dimensional structure,
Laminated elastic structure of 0.2 g / cm ³ surface where most of the contact portion are fused together by thermal bonding is substantially flat nonwovens are joined integrally density from 0.01 g / cm ³ A three-dimensional structure in which a thermoplastic elastic resin is discharged downward from the nozzle at a melting temperature 20 to 80 ° C. higher than the melting point of the multi-row nozzle having a plurality of orifices, and they are brought into contact with each other in a molten state to be fused. While forming, after being sandwiched by a take-off device and cooled in a cooling tank, a web of opened short fibers made of a thermoplastic elastic resin is laminated on one side, and a method for producing a laminated elastic structure that is thermoformed while being compressed and It is a product using the laminated elastic structure.

The thermoplastic elastic resin in the present invention means, as the soft segment, an ether type glycol, a polyester type glycol, a polycarbonate type glycol or a long chain hydrocarbon having a molecular weight of 300 to 5,000. Polyester elastomer obtained by block-copolymerizing an olefinic compound having a carboxylic acid or a hydroxyl group at the terminal, a polyamide elastomer, a polyurethane elastomer,
Examples include polyolefin elastomers. By using a thermoplastic elastic resin, it becomes possible to regenerate by remelting, and thus recycling becomes easy. For example, as the polyester elastomer, a polyester ether block copolymer having a thermoplastic polyester as a hard segment and a polyalkylenediol as a soft segment, or a polyester ester having an aliphatic polyester as a soft segment A block copolymer can be illustrated. More specific examples of the polyester ether block copolymer include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, naphthalene 2.6 dicarboxylic acid, naphthalene 2.7 dicarboxylic acid, and diphenyl 4.4'dicarboxylic acid. At least one of alicyclic dicarboxylic acids such as 1,4-cyclohexanedicarboxylic acid, aliphatic dicarboxylic acids such as succinic acid, adipic acid, sebacic acid dimer acid, and dicarboxylic acids selected from ester-forming derivatives thereof Seeds and aliphatic diols such as 1.4 butanediol, ethylene glycol, trimethylene glycol, tetremethylene glycol, pentamethylene glycol and hexamethylene glycol, 1.1 cyclohexane Alicyclic diols such as dimethanol and 1,4-cyclohexane dimethanol, or these Of at least one diole component selected from the ester-forming derivatives thereof and polyethylene glycol having an average molecular weight of about 300 to 5,000.
Is a ternary block copolymer composed of at least one kind of polyalkylenediol such as glycol, polypropylene glycol, polytetramethylene glycol, and glycol made of 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 5,000. . Thermal adhesion, hydrolysis resistance, stretchability,
Considering heat resistance and the like, terephthalic acid is used as the dicarboxylic acid, or naphthalene 2.6 dicarboxylic acid, 1.4 butanediol is used as the diole component, and polytetramethylene glycol is used as the polyalkylenediol. The terpolymer block copolymer or the terpolymer block copolymer of polylactone as the polyester diol is particularly preferable. In a special case, it is possible to use the one in which a polysiloxane-based soft segment is introduced. In addition, the above elastomer is blended with a non-elastomer component,
Those obtained by copolymerization and those obtained by softening the polyolefin component are also included in the thermoplastic elastic resin of the present invention. As a polyamide elastomer, the hard segment is nylon 6, nylon 66, nylon 610,
Polyethylene glycol, polypropylene glycol, polytetramethylene glycol, ethylene oxide having an average molecular weight of about 300 to 5000 is used as the soft segment in the skeleton of nylon 612, nylon 11, nylon 12, etc. and their copolymerized nylon. -A block copolymer composed of at least one kind of polyalkylenediol such as glycol composed of propylene oxide copolymer may be used alone or in combination of two or more kinds. Furthermore, blends of non-elastomer components and copolymers thereof can be used in the present invention. Examples of the polyurethane elastomer include (A) a polyester and / or a polyester having a hydroxyl group at the terminal and having a number average molecular weight of 1,000 to 6000 in the presence or absence of a usual solvent (dimethylformamide, dimethylacetamide, etc.). ) A typical example is a polyurethane elastomer obtained by reacting a polyisocyanate containing an organic diisocyanate as a main component with a prepolymer having isocyanate groups at both ends and (C) extending the chain with a polyamine containing a diamine as a main component. Can be illustrated as (A) Polyester, Polyester
The tellers have an average molecular weight of about 1000 to 6000,
Preferably from 1300 to 5000 polybutylene adipates
Copolyester, polyethylene glycol, polypropylene glycol, polytetramethylene glycol
Polyalkylenediol such as glycol and ethylene oxide-propylene oxide copolymer glycol is preferable, and as the polyisocyanate of (B), a conventionally known polyisocyanate can be used. An isocyanate mainly composed of 4'diisocyanate may be used, and if necessary, a trace amount of conventionally known triisocyanate may be added and used. As the polyamine (C), known diamines such as ethylenediamine and 1.2-propylenediamine are mainly used, and if necessary, trace amounts of triamine and tetraamine may be used in combination. These polyurethane elastomers may be used alone or in combination of two or more. The melting point of the thermoplastic elastic resin of the present invention is preferably 140 ° C. or higher at which heat resistance and durability can be maintained,
It is more preferable to use a material having a temperature of 160 ° C. or higher because the heat resistance and durability are improved. If necessary, an antioxidant, a light-proofing agent or the like may be added to improve durability. The soft segment content of the thermoplastic elastic resin constituting the component having the function of absorbing vibration and stress, which is the object of the present invention, is preferably 15% by weight or more, more preferably 30% by weight or more, and heat resistance and sag resistance Therefore, it is preferably 80% by weight or less, and more preferably 70% by weight or less. That is, the soft segment content of the component having the function of absorbing vibration and stress of the laminated elastic network of the present invention is preferably 15% by weight or more and 80% by weight or less, more preferably 30% by weight or more and 70% by weight or less. is there.

The component composed of the thermoplastic elastic resin constituting the laminated elastic structure of the present invention preferably has 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,
Heat resistance and sag resistance are remarkably improved as compared with those having no endothermic peak. For example, a preferable polyester-based thermoplastic resin of the present invention contains 90 mol% or more of terephthalic acid or naphthalene 2.6 dicarboxylic acid having rigidity in the acid component of the hard segment, more preferably terephthalic acid or The content of naphthalene 2.6 dicarboxylic acid is 9
5 mol% or more, particularly preferably 100 mol% and glyco-
After transesterification of the monomer component, polymerization is performed to a required degree of polymerization, and then, as the polyalkylene diol, the average molecular weight is preferably 500 or more and 5000 or less, particularly preferably 10
00 to 3000 polytetramethylene glycol in an amount of 15% to 70% by weight, more preferably 30% by weight.
When the amount of copolymerization is not less than 60% by weight and not more than 60% by weight, the crystallinity of the hard segment is improved when the content of terephthalic acid or naphthalene 2.6 dicarboxylic acid, which has rigidity in the acid component of the hard segment, is large. However, the plastic deformation is less likely to occur and the heat resistance and sag resistance is improved. However, if the annealing treatment is further performed at a temperature lower than the melting point by at least 10 [deg.] C. or more after the melt heat adhesion, the heat resistance and sag resistance is further improved. If annealing is performed after applying compressive strain, heat resistance and sag resistance are further improved. The endothermic peak is more clearly expressed in the melting curve measured by the differential scanning calorimeter of the laminated elastic structure thus treated at a temperature of room temperature or higher and melting point or lower. If annealing is not performed, no endothermic peak appears in the melting curve above room temperature and below the melting point. By analogy with this, it is considered that the annealing causes rearrangement of the hard segments and formation of pseudo-crystallization-like cross-linking points to improve the heat resistance and sag resistance. (This treatment is defined as pseudo crystallization treatment.) This pseudo crystallization treatment effect is also effective for polyamide elastic resin and polyurethane elastic resin.

The present invention has a fineness of 100 to 100,000 data.
Bend a continuous filament made of thermoplastic elastomer resin
Most of the contact parts are fused by twisting and contacting each other.
Form a three-dimensional three-dimensional structure that is substantially flat on both sides
Fineness of thermoplastic elastic resin on one surface of the reticulated material
Short fibers with a denier of 20 denier or less are opened and three-dimensionally structured,
The surface where most of the contact parts are fused and integrated by heat bonding is practical
Bonding with non-woven fabric (short-fiber non-woven fabric) that has been flattened
The solidified density is 0.01g / cm³To 0.2 g / cm³
Is a laminated elastic structure. The function of the cushioning material is
The foundation layer has a basic fineness that is thicker and a little harder to maintain body shape.
The density is a little higher due to the layer responsible for vibration and components with good vibration damping
It consists of a layer that absorbs vibrations and blocks vibrations, and the surface layer is
As a soft layer with a fineness and a large number of constituent fibers
Gives a comfortable buttocks touch with a moderate subsidence, buttocks
The pressure distribution of the
It absorbs the vibration that could not be absorbed and absorbs the vibration of the resonance part of the human body.
By integrating the layers that shut off, stress and vibration can be integrated.
It can be deformed and absorbed to improve the sitting comfort. Book
In the invention, the function of the cushion layer is changed from the thermoplastic elastic resin.
It has a fused three-dimensional three-dimensional structure
The surface layer functions as a short fiber made of thermoplastic elastic resin.
A preferred cushioning material by holding it on a woven fabric and joining and integrating it
It is a laminated elastic structure capable of imparting a function. Lamination of the invention
The short fiber non-woven fabric having the surface layer function that constitutes the elastic structure is
As a soft layer, it has a moderate subsidence for comfortable buttocks.
The fineness of the thermoplastic elastic resin is 2
It is composed of short fibers of 0 denier or less. Over 20 denier
The surface layer function that favors the apparent density of short fiber non-woven fabric
0.01g / cm that can give³0.05g / cm or more³Since
When placed below, the number of components is reduced
It is not preferable because it does not show the characteristics of
Yes. The preferred fineness of the short fibers is 2 denier to 15 denier.
And more preferably 3 to 10 denier.
In addition, short fibers made of thermoplastic elastic resin have a three-dimensional structure.
And most of the contact parts were fused and integrated by thermal bonding.
Substantial surface (preferably all contact points are fused together)
The non-woven fabric is flattened locally to keep the buttocks locally
If you receive various pressures on the surface and evenly distribute the pressure distribution,
In both cases, short fibers made of thermoplastic elastic resin have a three-dimensional structure.
Since the structure is formed and integrated by fusion, the entire structure is
Deforms and absorbs the deformation stress by energy conversion and deforms
Easy to release due to rubber elasticity of thermoplastic elastic resin when stress is released
Has a function to restore the original form, so it has good sag resistance
Is. Furthermore, the damage to the cushion layer can be gradually reduced.
Therefore, the sag resistance of the entire structure is improved. Integrated fusion
If not, the shape cannot be maintained and the local pressure is not applied.
The pressure distribution cannot be uniformly distributed, and the structure
The whole is deformed and energy cannot be converted, so durability is poor.
Less preferred. Thermoplastic bullets with short fibers that have good vibration absorption
Since it is made of a resin that can not be absorbed by the cushion layer,
As a layer that absorbs movements and blocks vibrations in the resonant parts of the human body
The function of. Short fibers made of thermoplastic non-elastic resin
In this case, it is not possible to follow the local deformation stress.
It is preferable because the structure is destroyed due to the inside and the recoverability is poor.
No In addition, the thermoplastic non-elastic resin has poor vibration absorption.
Therefore, the function as a layer that blocks vibration is inferior
Yes. Although the thickness of the short fiber non-woven fabric layer is not particularly limited,
3 mm to 30 mm is preferable for exhibiting the surface layer function, and 5 mm to
20 mm is particularly preferred. On the other hand, it has a cushion layer function
A continuous filament made of thermoplastic elastic resin makes contact with the mesh.
Most of the parts are fused together to form a three-dimensional solid structure and fused together.
It is embodied and both sides are substantially flattened
Vibration absorption function of thermoplastic elastic resin
Absorbs and dampens most of the vibration, and locally large deformation stress
The surface of the mesh is substantially flat even when given
Most of the contact area has been fused and the surface has no short fibers.
Since it is bonded to the woven fabric at the surface, deformation stress is generated at the surface of the mesh body.
Receiving deformation to disperse deformation stress and exerting body shape retention function
At the same time, the filament made of thermoplastic elastic resin has a three-dimensional structure.
Since the structure is formed and integrated by fusion, the entire structure is
Deforms and absorbs the deformation stress by energy conversion and deforms
Easy to release due to rubber elasticity of thermoplastic elastic resin when stress is released
Has a function to restore the original form, so it has good sag resistance
Is. Consists of a wire made of known non-elastic resin only
Since the net-like body does not have rubber elasticity, it is plastic by compression deformation.
It deteriorates due to sexual deformation and is inferior in durability. Reticulated
Short fiber non-woven when the surface is not substantially flattened
The local external force transmitted from the cloth is due to the surface lines and adhesion.
When the stress is selectively transmitted up to the point and stress concentration occurs
There is a possibility that the external force will cause fatigue due to stress concentration.
There is a case where labor is generated and the sag resistance is deteriorated. In addition,
If the filament is made of thermoplastic elastic resin, it has a three-dimensional structure.
Since the entire structure is deformed in minutes, stress concentration is relieved,
With non-elastic resin, stress concentrates on the bonding points as it is
It will be destroyed and will not recover. Furthermore, the surface is substantially
Feeling of foreign matter in the buttocks when sitting without ratification and unevenness
It is not preferable because it gives a bad sitting comfort. In addition,
If the linear shape is not continuous, contact with a net with a large fineness.
Significant stress concentration at the bonding point because the contact point serves as a stress transfer point
Undesirably resulting in structural destruction and poor heat resistance and durability.
Yes. If not fused, the shape cannot be maintained and the structure
The fatigue phenomenon due to stress concentration occurs because the
Durability is poor, and at the same time, the shape is deformed and body retention is maintained.
It is not preferable because it cannot be done. More preferred of the present invention
The degree of fusion is such that most of the parts where the filaments are in contact
It is in the state of being welded, and most preferably all contact parts are fused
It is in the state of having done. Thus, vibration absorption and elastic recovery
A continuous filament made of good thermoplastic elastic resin
Mostly fused 3D solid structure is formed and fused together
Cushion layer function with substantially flat surface
Is a non-woven short fiber made of thermoplastic elastic resin.
The surface receives the deformation stress transmitted from the surface layer composed of cloth
Improves the distribution of the stopping stress and reduces the stress applied to each line.
Without it, the whole structure will deform and absorb the deformation stress, and
The cushioning that supports the parts is also improved, and the stress is released
And the vibration transmitted from the frame is also absorbed and elastic.
Cushion layer made of thermoplastic elastic resin with good recovery
Comfortable to sit because it absorbs and blocks the vibration of the resonance part of the human body
And the durability can be improved. From this purpose, the book
Good vibration absorption and elastic recovery forming the reticulated body of the invention
The fineness of the filament made of thermoplastic elastic resin is 100 to 100.
It is 000 denier. Apparent density 0.2g / cm³Since
If it is below 100,000 denier, it will be a constituent book
The number is small, and uneven density is caused, resulting in poor durability.
Structure is created, fatigue due to stress concentration increases and durability
It is not preferable because it decreases. Thermoplastic elastic resin of the present invention
The fineness of filaments consisting of
Since it becomes too much and the stress absorption due to deformation decreases, 10
0 denier or higher
It is 50,000 denier or less, which does not impair the compactness. Yo
More preferably 500 denier or more, 10,000 denier
It is the following. The apparent density of the reticulate body of the present invention is 0.00
5 g / cm³Then, the repulsive force is lost, and the vibration absorption ability and deformation response
Insufficient force absorption capacity to develop cushioning function
It may get worse, 0.25g / cm ³Repulsive force above
May be too high and make you feel uncomfortable to sit on.
As a cushion body, it can take advantage of its capacity to absorb and deformation stress absorption function.
0.01g / cm that all functions are easily expressed³0.2 or more
0 g / cm³The following is preferable, and more preferably 0.03 g
/cm³0.08 g / cm or more³It is the following. In the present invention
The reticulate body has different fineness in combination with apparent density
It is also preferable to use a method of forming a different-fineness laminated structure with an optimal configuration.
It can be selected as an embodiment. The thickness of the mesh body of the present invention is
However, if the thickness is less than 5 mm, it may have a stress absorbing function.
Since the stress distribution function is reduced, the preferred thickness is the distribution of force.
A thickness that can develop the surface function to perform vibration and the function to absorb vibration and deformation stress
Only 10 mm or more, more preferably 20 mm or more
Is. The net body of the present invention and the short fiber non-woven fabric are bonded and integrated.
The apparent density of the laminated elastic structure is 0.01 g /
cm³To 0.2 g / cm³Is. 0.01 g / cm³Less than
Will reduce the cushioning function such as body shape retention and vibration absorption.
It is not preferable because 0.2 g / cm³Repels when crossing
It is not preferable because it becomes more difficult to sit and sit comfortably.
Preferred apparent density is 0.02g / cm³~ 0.1g / cm
³And more preferably 0.03 g / cm³~ 0.06
g / cm³Is.

The cross-sectional shape of the filament of the reticulate body of the present invention is not particularly limited, but a hollow section or a modified cross section is particularly preferable because it can impart preferable anti-compression property (repulsive force) and touch. The anti-compression property can be adjusted by the fineness and the modulus of the material used to make the fineness fine, or in the soft material the hollowness and the irregularity can be increased to adjust the gradient of the initial compression stress, and the fineness can be made slightly thicker or slightly. A material with a high modulus lowers the hollow ratio and the degree of irregularity to provide anti-compression property with a comfortable sitting feeling. As another effect of the hollow cross section and the irregular cross section, by increasing the hollow ratio and the degree of irregularity, if the same anti-compression property is given, the weight can be further reduced, and the energy saving can be achieved when it is used for the seat of an automobile or the like. If it is a futon or the like, it will be easier to handle when raising and lowering. As another preferable method for imparting preferable anti-compression property (repulsive force) and touch, there is a method of forming the filament of the reticulated body of the present invention into a composite structure. Examples of the composite structure include a score core structure, a side-by-side structure, and a combination structure thereof. However, especially when the cushion layer is largely deformed, the energy and
In order to obtain a three-dimensional three-dimensional structure that can be converted and restored, a sheath-core structure or a side-by-side structure in which 50% or more of the linear surface is occupied by a soft thermoplastic elastic resin, and a combination thereof are mentioned. That is, in the sheath core structure, the sheath component is a thermoplastic elastic resin having a large content of soft segments that can easily convert energy into vibration and deformation stress, and the core component is a thermoelastic resin having a small content of soft segments exhibiting anti-compression properties. Composed of a plastic elastic resin, it can give a comfortable touch to the buttocks due to an appropriate depression. With the side-by-side structure, the melt viscosity of a thermoplastic elastic resin with a high soft segment content that facilitates energy conversion of vibration and deformation stress is lower than the melt viscosity of a thermoplastic elastic resin with a low soft segment content that exhibits anti-compression properties. A structure with a large proportion of thermoplastic elastic resin occupying a linear surface and having a high soft segment content (metamorphically, eccentric sheath
It is particularly preferable that the ratio of the thermoplastic elastic resin having a large soft segment content occupying the linear surface is 80% or more as a structure in which the thermoplastic elastic resin is arranged in the sheath / core structure). Most preferably, it is a sheath core in which the proportion of the thermoplastic elastic resin having a large soft segment content occupying the linear surface is 100%. When the proportion of the thermoplastic elastic resin with a large soft segment content that occupies the linear surface is large, the flowability when melting and fusing is high, so there is the effect of strengthening the adhesion, and the structure deforms as a unit. In this case, the fatigue resistance against stress concentration at the bonding point is improved,
Heat resistance and durability are further improved.

Since the reticulate body made of thermoplastic elastic resin and the short fiber non-woven fabric are joined and integrated to substantially flatten both sides, the reticulate body, non-woven fabric, knitted fabric, hard fabric Other heat-adhesive components (heat-bonded non-woven fabric, heat-bonded fiber, heat-bonded film, heat-bonded resin, etc.) and adhesives are used to bond cotton, film, foam, metal, etc. In order to obtain products such as vehicle seats, ship seats, vehicle seats, ship seats, hospital beds and other commercial and household beds, furniture chairs, office chairs, futons, etc. Since the contact area with the adhesive body surface can be widened,
It is possible to obtain a product having a wide adhesion area and strong adhesion and good adhesion durability. In addition, by performing the above-mentioned pseudo crystallization treatment at any stage of commercialization from the laminated elastic structure forming stage, the melting curve of the component composed of the thermoplastic elastic resin in the structure measured by a differential scanning calorimeter It is more preferable to have an endothermic peak at a temperature of room temperature or higher and melting point or lower, because the heat resistance and durability of the product is remarkably improved. When the filaments of the net-like body forming the laminated elastic structure of the present invention have a composite structure, the back surface of the laminated elastic structure can also be provided with a heat-adhesive function, and the reinforcing material and the like can be integrated into a heat-adhesive structure. For example,
In the sheath core structure, the soft segment content, which is easy to energy-convert the vibration and deformation stress of the sheath component, is used as the thermoplastic adhesive resin, and the soft segment content showing the anti-compressibility of the core component is The composition is such that a small amount of thermoplastic elastic resin is used as a high melting point component to have a function of holding a net-like shape, and the melting point of the heat bonding component is 1 or more than the melting point of the high melting point resin.
The function of the heat-bonding layer can be imparted by using the one whose temperature is lowered by 0 ° C. or more. Further, the short-fiber non-woven fabric of the surface layer of the laminated elastic structure of the present invention is a heat-bonded fiber containing a low-melting point thermoplastic elastic resin having a large content of soft segments that facilitates energy conversion of vibration and deformation stress as a heat-bonding component. The heat-bonding function can also be imparted by configuring The melting point of the heat-adhesive component forming the filaments or fibers in the laminated elastic structure that is preferable for exhibiting the heat-adhesion function is 15 ° C to 50 ° C lower than the melting point of the high-melting point component, and more preferably 20 ° C to 40 ° C.
℃ lower melting point. The laminated elastic structure of the present invention having a heat-bonding function has a substantially flat surface, and most of the contact portions are fused, thereby forming a mesh body, a non-woven fabric, a knitted fabric,
Since the contact area with the surface of the heat-bonded material such as hard cotton, film, foam, metal, etc. can be widened, the heat-bonded area is widened, and a new molded article and a vehicle seat, a ship seat, a vehicle that are strongly heat-bonded. It is possible to obtain products such as commercial, household and commercial beds for ships, ships, hospitals, chairs for furniture, office chairs, and futons. In addition, by performing pseudo crystallization at any stage until new molded products and products are commercialized, the filaments made of the thermoplastic elastic resin in the structure are melted by a differential scanning calorimeter. It is more preferable to make the curve have an endothermic peak at a temperature of room temperature or higher and melting point or lower because a product with significantly improved heat resistance and durability can be provided.
When the adherend is adhered in a stretched state at the time of heat-bonding, the adhered body does not relax the stretched state due to the rubber elasticity of the adhesive layer, so that the adherend can be a molded body having tension and less likely to wrinkle.

Next, the manufacturing method of the present invention will be described. According to the manufacturing method of the present invention, the thermoplastic elastic resin is discharged downward from the nozzle at a melting temperature higher than the melting point thereof by 20 ° C. or higher and lower than 80 ° C. from a multi-row nozzle having a plurality of orifices, and the thermoplastic resin is brought into contact with each other in a molten state. While forming a three-dimensional structure by fusing, it is sandwiched by a take-up device and cooled in a cooling tank, and then a web formed by opening short fibers made of thermoplastic elastic resin is laminated on one side and thermoformed while being compressed. It is a method of manufacturing a laminated elastic structure. The thermoplastic elastic resin is melted using a general melt extruder, supplied to a multi-row nozzle having a plurality of orifices, and discharged below the orifices. The melting temperature at this time is 20 ° C. to 80 ° C. higher than the melting point of the thermoplastic elastic resin. If the melting temperature is higher than 80 ° C. higher than the melting point of the thermoplastic elastic resin, thermal decomposition becomes remarkable and the rubber elastic properties of the thermoplastic elastic resin deteriorate, which is not preferable. On the other hand, unless the temperature is higher than the melting point of the thermoplastic elastic resin by 10 ° C. or more, melt fracture occurs and normal filament formation cannot be performed. Further, when the filament is formed by looping after discharge and is brought into contact and fused. The temperature may be lowered and the filaments may not be fused to each other, resulting in a network having insufficient adhesion, which is not preferable. The preferred melting temperature is 20 ° C to 60 ° C above the melting point, more preferably 25 ° C to 40 ° C above the melting point. The shape of the orifice is not particularly limited, but a hollow cross section (for example, a hollow shape having a triangular shape, a round shape, a hollow shape with a protrusion, etc.) and / or an irregular cross section (for example, a triangular shape,
In addition to the above effects, the three-dimensional structure formed by the discharge filaments in the molten state is less likely to flow relaxation, and conversely at the contact point Is particularly preferable because the adhesion point can be strengthened by keeping the fluidizing time of (1) long. When heating for adhesion as described in Japanese Patent Application Laid-Open No. 1-2075, the three-dimensional structure is easily relaxed, a planar structure is formed, and a three-dimensional three-dimensional structure becomes difficult, which is not preferable. As an effect of improving the properties of the reticulate body, the apparent bulk can be increased, the weight can be reduced, the anti-compression property can be improved, and the elasticity can be improved, which is difficult to obtain. In the hollow cross section, if the hollow ratio exceeds 80%, the cross section tends to be crushed. Therefore, it is preferably 10% or more and 70% or less, more preferably 20% or more and 60% or less, which can exhibit the effect of weight reduction. The pitch between the holes of the orifice needs to be a pitch with which the loop formed by the line can sufficiently contact. The pitch between holes is shortened for a dense structure, and the pitch between holes is lengthened for a coarse structure. The pitch between the holes of the present invention is preferably 3 mm to 20 mm, more preferably 5 mm to 10 mm. In the present invention, different densities and different fineness can be obtained as desired. The different density layer can be formed by a configuration in which the pitch between rows or the pitch between holes is also changed, or a method in which the pitch between both rows and holes is also changed. Also, if the pressure loss difference at the time of discharge is given by changing the cross-sectional area of the orifice, the principle that the discharged amount of molten thermoplastic elastic resin extruded from the same nozzle at a constant pressure becomes smaller for the orifice with larger pressure loss, is used. It is possible to manufacture a reticulated structure composed of filaments of different fineness by using a nozzle having at least a plurality of rows having different cross-sectional areas of orifices in a section in the longitudinal direction.
Then, the liquid is discharged downward from the nozzle, and while forming a loop, they are brought into contact with each other in a molten state to be fused to form a three-dimensional structure, and are sandwiched by a take-up net to melt the surface of the net-like body. Bending the twisted discharge line of 45 degrees or more to deform it to flatten the surface and at the same time bond the contact points with the unbent discharge line to form a structure, and then continuously cool the medium (usually at room temperature). It is preferable to use the water described above because the cooling rate can be increased and the cost can be reduced). Thus, the three-dimensional three-dimensional network structure of the present invention is rapidly cooled to obtain the laminated network. The distance between the nozzle surface and the take-off point is preferably at least 40 cm or less to prevent the discharge filament from being cooled and the contact portion not being fused. When the discharge amount of the discharge line is as large as 5 g / min or more, 10 cm to 40 cm is preferable, and when the discharge amount of the discharge line is less than 5 g / min hole, 5 cm to 20 cm is preferable. The thickness of the laminated network is determined by the opening width of the take-up net (interval between the take-up nets) that sandwiches both surfaces of the three-dimensional structure in the molten state. In the present invention, the opening width of the take-up net is set to 5 mm or more for the above reason.
Next, it is drained and dried, but if a surfactant or the like is added to the cooling medium, draining and drying may be difficult, or the thermoplastic elastic resin may swell, which is not preferable. The desired loop diameter and wire diameter can be determined by the distance between the nozzle surface and the take-up conveyor installed on the cooling medium for solidifying the resin, the melt viscosity of the resin, the orifice hole diameter and the discharge amount, and the like.
A pair of take-up conveyors with adjustable spacing installed on the cooling medium sandwiches and holds the melted discharge filaments to fuse the portions that are in contact with each other and continuously draw in the cooling medium to solidify. By adjusting the distance between the conveyors when forming the structure, the thickness can be adjusted while the fused net-like body is in a molten state, and a desired thickness can be obtained. If the conveyor speed is too high, the formation of contact points may be insufficient, or the contact point may be cooled until the fusion point is sufficiently formed, resulting in insufficient fusion of the contact portion.
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. Next, in the production method of the present invention, it is joined and integrated with a short fiber non-woven fabric having a surface layer function. The short fibers composed of a thermoplastic elastic resin and having a fineness of 20 denier or less are obtained by individually melting thermoplastic elastic resins having different melting points, spinning them by a well-known composite spinning, and stretching. However, with this method, only a high shrinkage rate of 20% to 50% can be obtained, and therefore, when the web is thermoformed, a defective molding dimension occurs due to the shrinkage of the web.
It is preferably obtained by a method in which the shrinkage rate is reduced to 10% or less by high-speed spinning at a speed of m / min or more and the finished yarn is obtained at a stretch.
Next, crimping is applied and cut into a desired cut length to obtain short fibers. Although the composite form of the short fibers used in the present invention is not particularly limited, it is preferable that the low melting point component occupies 50% or more of the surface of the fiber in the side-by-side or sheath core because the function as the heat-bonding fiber is preferable. More preferably, the low melting point component occupies 100% or more of the surface of the fiber. The short fibers thus obtained are provided with an opening web having a three-dimensional opening structure with a card or the like, which is laminated and compressed on the surface of the reticulated body and bonded and integrated by thermoforming, or once opened. It is also possible to laminate and compress only the above to form a structure by thermoforming to form a short fiber non-woven fabric, and then join and integrate the net body and the short fiber non-woven fabric. In this case, a thermal adhesive layer or an adhesive may be separately used between the reticulate body and the short fiber non-woven fabric for bonding and integration, or the thermal rebonding function of the reticulate body or the short fiber non-woven fabric may be used for bonding and integration. Good. As a preferred method of the present invention, a temperature of at least 10 ° C. or lower than the melting point of the thermoplastic elastic resin is used in any step leading to commercialization of the laminated elastic structure obtained by once cooling the reticulated body or integrally molding it. It is a more preferable production method to obtain a laminated reticulate body or a product by carrying out a pseudo crystallization treatment by annealing. The pseudo-crystallization treatment temperature is at least 10 from the melting point (Tm).
℃ or lower, Tanδ α dispersion rising temperature (Tαc
r) Perform above. With this treatment, the heat resistance and sag resistance are remarkably improved as compared with those having a heat absorption peak below the melting point and having no pseudo-crystallization treatment (those having no heat absorption peak). The preferred pseudo-crystallization treatment temperature of the present invention is (Tαcr + 10 ° C.)
To (Tm-20 ° C). If it is pseudo-crystallized by simple heat treatment, heat resistance and sag resistance are improved. In addition,
It is more preferable to give compressive deformation of 10% or more and anneal so that the heat and sag resistance can be remarkably improved.
Further, when the reticulate body is once cooled and then subjected to a drying step, the pseudo crystallization treatment can be simultaneously performed by setting the drying temperature to the annealing temperature. Also, a pseudo crystallization treatment can be separately performed in the process of commercialization. Then, it is cut into a desired length or shape and used as a cushion material.

When a cushion is used for the laminated elastic structure of the present invention, a resin used depending on the purpose and site of use,
It is necessary to select the fineness, the loop diameter, and the bulk density. For example, in order to give a soft touch, moderate depression and bulging with tension, a dense structure with a slightly high density and fine fineness is preferable, and in order to exert the cushion function of the middle layer, the resonance frequency is low. However, in order to improve the body shape retention by linearly changing the appropriate hardness and hysteresis at the time of compression, in order to maintain durability, medium density, thick fineness, a layer with a slightly larger loop diameter and low density It is preferable to have a structure in which layers having a fine fineness and a fine loop diameter are laminated and integrated. Since the laminated elastic structure of the present invention has the functions of the surface layer and the cushion layer at the same time, it can be formed 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 impaired, and the side cloth is covered. It can be used for vehicle seats, boat seats, beds, chairs, furniture and the like. Of course, it is also possible to use it in combination with other materials such as a different mesh body, a hard cotton cushion material composed of a short fiber aggregate, a non-woven fabric or the like so as to meet the required performance in relation to the application. In addition, other than the resin manufacturing process, the molded product is processed from the manufacturing process to the extent that performance is not deteriorated, and at any stage of commercialization, it becomes flame retardant, insecticidal, antibacterial, heat resistant, water / oil repellent, colored, aroma, etc. It is possible to perform the processing such as the addition of chemicals to add the function.

[0016]

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. Tαcr polymer is heated to the melting point + 10 ° C and the thickness is about 300 μm.
Film was prepared and measured using a Vibron DDVII type manufactured by Orientec Co., Ltd. at a rate of 110 Hz and a temperature rising rate of 1 ° C./min. Tan δ (ratio M ″ / imaginary elastic modulus M ″ to real part M ′ of elastic modulus) The rising temperature of α dispersion corresponding to the transition temperature from the rubber elastic region to the melting region of M ′). Apparent Density The sample is cut into a size of 15 cm × 15 cm, the heights at four locations are measured, the volume is determined, and the weight of the sample is divided by the volume. (Average value of n = 4) Fineness of filaments Each filament portion is cut out from 10 points of the sample, embedded in acrylic resin, the cross section is cut out, and a section is prepared to obtain a cross section photograph. The cross-sectional area (Si) of each part is obtained from the cross-sectional photograph of each part. In addition, a piece obtained in the same manner was dissolved in acrylic resin with acetone, degassed in vacuum, and a density gradient tube was used to 40 ° C.
Determine the specific gravity (SGi) measured in. Then, a linear weight of 9000 m is obtained from the following equation. (Unit: cgs) Fineness = [(1 / n) ΣSi × SGi] × 900000 Fusing Whether or not the sample is fused by visual judgment depends on whether or not the fibers adhering to each other cannot be pulled apart by hand It is determined that something that does not come off is fused. Heat resistance and durability (residual strain at 70 ° C) Cut a sample into a size of 15 cm x 15 cm, compress it by 50%, leave it in dry heat at 70 ° C for 22 hours, then cool to remove compression strain and leave it for 1 day (b) Is calculated, and is calculated from the thickness (a) before processing by the following equation, that is, (ab) / a × 100. Unit% (average value of n = 3) Cyclic compressive strain A sample was cut into a size of 15 cm x 15 cm, and a Shimazu Seisakusho pulsarcer was used at 25 ° C and 65% in an RH room at 50%.
The thickness (b) after leaving the sample for 20,000 times after repeating compression recovery at a cycle of 1 Hz up to the thickness of 1 is calculated from the thickness (a) before the treatment, that is, (ab) / ax Calculated from 100. Unit% (average value of n = 3) Sit comfort Covering the side layer of a laminated elastic structure cut into the shape of a bucket sheet with a side of polyester moquette made of Toyobo Co., Ltd. Heim, seat frame The seats with four side seats and six back parts with side landscaps were prepared, and a paneler was seated on the seats prepared at 30 ° C RH75% room for the following evaluation. (N = 5) (1) Feeling on the floor: The degree of "dosun" when sitting and the feeling of hitting the floor were qualitatively and qualitatively evaluated. Not felt; ◎, hardly felt; ○, slightly felt; △, felt; × (2) Feeling of stuffiness: Feeling stuffy when sitting for 2 hours and the buttocks and the part of the crotch that contacts the seat inside the crotch Qualitatively evaluated. Almost no feeling: ◎, slightly stuffy; ○, slightly stuffy; △, significantly stuffy; × (3) How long you can sit in the seat within 8 hours: within 1 hour; × within 2 hours; △ within 4 hours;
○ 4 hours or more; ◎ (4) A qualitative qualitative evaluation was performed on the degree of waist fatigue when the user sat in the seat for 4 hours. None; ◎, hardly tired; ○, slightly tired; △, very tired; × (5) Overall evaluation: 4 points from ◎ of the evaluations from (1) to (4), ○
3 points, △ is 2 points, × is 1 point and does not include Δ with 12 points or more; very good (⊚), that with 12 points or more; Good (○), 10 points or more is x It was evaluated as those which did not contain; those which were somewhat bad (Δ) and those which contained x; bad (x).

Example 1 As a polyester elastomer, dimethyl terephthalate (DMT) or dimethyl naphthalate (DM) was used.
N) 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) was added and polycondensation was performed while heating and depressurizing. -Formation of terester block copolymer elastomer, then addition and mixing of 2% of antioxidant, kneading, pelletizing, and vacuum drying at 50 ° C for 48 hours are shown in Table 1. .

[0019]

[Table 1]

Orifice shapes having a staggered arrangement with a hole pitch of 5 mm in the width direction and a hole pitch of 10 mm in the length direction on an effective surface of a nozzle of 50 cm in width and 5 cm in length are 2 mm in outer diameter and 1.6 mm in inner diameter.
With a nozzle with a triple bridge hollow forming cross section,
The obtained thermoplastic elastic resin raw material A-2 was melted at a temperature of 245
Discharge to the bottom of the nozzle at a discharge rate of 2.0 g / min per single hole at ℃, place cooling water 12 cm below the nozzle surface, and have a width of 60
cm stainless endless nets are arranged in parallel at intervals of 5 cm so that a part of a pair of take-up conveyors are projected on the water surface, and the melted discharge line is bent to form a loop to form a contact portion. After fusing, the three-dimensional network structure is formed, and both sides of the network state in the molten state are drawn into cooling water at 25 ° C. at a speed of 1 m per minute while sandwiching both sides with a take-up conveyor to flatten both sides. The reticulate body obtained by cutting into a predetermined size has a triangular cross-sectional hollow section, is formed by a filament having a hollow ratio of 40% and a fineness of 9000 denier, and has an average apparent density. It was 0.046 g / cm ³ . Separately, using a known composite spinning machine by a conventional method,
-1 and A-2 thermoplastic elastic resins are individually melted to form A-1.
To form the sheath component and A-2 to form the core component,
Each discharge rate is 50/50 weight ratio, 1.6g / per hole
Spinning temperature 2 as splitting holes (0.8 g / min: 0.8 g / min)
At 45 ° C., a yarn having a fineness of 4.1 denier at a spinning speed of 3500 m / min and a shrinkage ratio of 6% at a dry heat of 160 ° C. is converged into a tow-shaped crimp to be mechanically crimped. Grant, 64
It was cut into mm to obtain short fibers made of thermoplastic elastic resin having a cross-section. The short fiber was pre-opened with an opener and then opened with a card, and the web was weighed 1000 g.
/ M ² and laminated on the net-like body, and the apparent density was 0.
It was compressed so as to have a weight of 05 g / cm ³ , heat treated with hot air at 190 ° C. for 5 minutes, and then cooled to obtain a laminated elastic structure having flat both sides. Next, Table 2 shows the characteristics of the laminated elastic structure of the present invention obtained by compressing 10% of the thickness and performing pseudo-crystallization treatment with hot air at 100 ° C. for 20 minutes. As is clear from Table 2, Example 1 was a cushioning material excellent in heat resistance, durability at room temperature, and sitting comfort because it was a laminated elastic structure in which the characteristics of the soft elastic resin were utilized. It can be seen that the seat created for evaluation also has excellent performance.

[0021]

[Table 2]

Example 2 20 mol% of dimethyl isophthalate (DMI) and DMT
Table 1 shows the formulation of the polyester-based thermoplastic elastic resin obtained in the same manner as in Example 1 by charging 80 mol% and 1.4-butanediol (1.4-BD) with a small amount of a catalyst.
The net-like body obtained in the same manner as in Example 1 except that the orifice had a circular cross section with a hole diameter of 1 mm was formed from filaments having a solid round cross section with a fineness of 9000 denier. The apparent density was 0.046 g / cm ³ .
Next, the properties of the laminated elastic structure obtained in the same manner as in Example 1 are shown in Table 2. As is clear from Table 2, it can be seen that Example 2 is a cushioning material which is practically usable in terms of heat resistance and durability at room temperature and has an excellent sitting comfort, and the seat prepared for evaluation is also excellent.

Example 3 As a polyurethane elastomer, 4,4'-diphenylmethane diisocyanate (MDI), PTMG and 1.4BD as a chain extender were added and polymerized, and then 2% of an antioxidant was added and mixed. Table 3 shows the formulation of the polyether urethane polymer after kneading, pelletizing and vacuum drying.

[0024]

[Table 3]

The cross section of the filaments of the reticulate body obtained in the same manner as in Example 1 except that the obtained thermoplastic elastic resin (B-2) was melted at 220 ° C. had a triangular cross-section and was hollow. Was 41%, the fineness was 9800 denier, and the average apparent density was 0.047 g / cm ³ . On the other hand, B-1 was used as the sheath component and B-2 as the core component, and the spinning temperature was 210.
The composite fiber obtained in the same manner as in Example 1 except that the temperature was set to 0 ° C has a fineness of 4.5 denier and a shrinkage ratio at 160 ° C of 12
%Met. This composite fiber was processed in the same manner as in Example 1 to 10
To a laminated web of 00 g / m ² and laminated with the mesh body,
After heat treatment for 5 minutes with hot air at 160 ° C., it was cooled to obtain a laminated elastic structure having flat both sides. Next, Table 2 shows the characteristics of the laminated elastic structure of the present invention obtained by compressing 10% of the thickness and performing pseudo-crystallization treatment with hot air at 100 ° C. for 20 minutes. Example 3 was a cushioning material that was a laminated reticulated body that took advantage of the characteristics of soft urethane and that was excellent in heat resistance, durability at room temperature, and sitting comfort. It can be seen that the seat created for evaluation is also excellent.

Comparative Examples 1-2 Polyethylene terephthalate (PE with an intrinsic viscosity of 0.63)
T) and polypropylene with a melt index of 12 (P
P) has a fineness of 8800 denier and an apparent density of 0.047 g / cm 3 in the reticulate body obtained in the same manner as in Example 2 except that the melting temperatures are 280 ° C. and 250 ° C.
³ , the fineness of the mesh used in Comparative Example 2 is 23,000 denier.
The apparent density was 0.047 g / cm ³ . Next, Table 2 shows the characteristics of the laminated elastic structure obtained in the same manner as in Example 2 except that the pseudo crystallization treatment was not performed. Comparative Example 1
Is a cushion material that is poor in heat resistance and durability because it is a net-like body made of non-elastic polyester, and is hard and uncomfortable to sit in, despite using a short fiber non-woven fabric made of thermoplastic elastic resin for the surface layer. Since Comparative Example 2 is a reticulate body made of a non-elastic olefin having a slightly finer fineness, it has poor heat resistance and durability.
It was a cushioning material which was uncomfortable to sit in, despite the fact that a short fiber non-woven fabric made of a thermoplastic elastic resin was used for the surface layer.

Comparative Example 3 Example 2 was repeated except that a take-up conveyor net was placed 60 cm below the nozzle surface and no pseudo crystallization treatment was performed after the take-up conveyor net was taken out.
Table 2 shows a part of the properties of the reticulate body obtained by the same method as described above.
Since the laminated elastic structure could not be formed due to poor adhesion and poor shape retention, repulsive force at 50% compression, apparent density, reinforcing effect, 70 ° C residual strain, repeated compression strain, and sitting comfort. Is not evaluated. Comparative Example 3 is an example that is not suitable for a cushioning material because its shape is not fixed.

Comparative Example 4 The fineness obtained in the same manner as in Example 2 except that the pseudo crystallization treatment was not performed was 9100 denier, and the average apparent density was 0.04.
5 g / cm ³ mesh body and Toyobo Co., Ltd. 4-44-EE7
Table 2 shows the characteristics of a structure in which a short fiber non-woven fabric made of a thermoplastic non-elastic resin prepared in the same manner as in Example 1 was laminated on the surface layer and bonded and integrated, except that the pseudo crystallization treatment was not performed using Table 2.
Shown in. In Comparative Example 4, since the cushion layer was made of the thermoplastic elastic resin, the cushioning material was comfortable to sit on, but was slightly poor in heat resistance and durability.

COMPARATIVE EXAMPLE 5 A nozzle having a width of 50 cm and a length of 5 cm and having a staggered arrangement of holes with a pitch of 10 mm in the width direction and a pitch of 20 mm between the holes in the length direction was used as a nozzle having a diameter of 2 mm. The fineness of the filament obtained in the same manner as in Comparative Example 4 was 113 except that the discharge rate was 25 g / min, the take-up conveyor net was placed 30 cm below the nozzle surface and the rate was 1 m / min.
000 denier, the average apparent density is 0.154 g /
Table 2 shows the characteristics of the laminated elastic structure produced in the same manner as in Example 2 except that the network of cm ³ was used and the pseudo crystallization treatment was not performed.
Shown in. Comparative Example 5 was a cushioning material having a remarkably fineness and a dense density unevenness, so that the heat resistance and durability were poor and the sitting comfort was a little poor.

Comparative Example 6 The linear fineness obtained in the same manner as in Comparative Example 4 was 9000 denier, and the average apparent density of the elastic mesh was 0, except that the spacing (opening width) of the take-up conveyor net was 5 cm. 0.043 g /
Table 2 shows the properties of the laminated elastic structure produced in the same manner as in Example 2 except that the net-like body whose surface of cm ³ was not substantially flattened was used and the pseudo-crystallization treatment was not performed. Comparative Example 6
Since the surface of the net-like body was uneven, the apparent density was low, but the durability was poor, the thermal adhesion was insufficient, and the cushioning material was a little inferior in sitting comfort with a feeling of foreign matter.

Comparative Example 7 Obtained in the same manner as in Example 2 except that the discharge amount per single hole was 3 g / min, the speed of the take-up conveyor net was 0.3 m / min, and the pseudo crystallization treatment was not performed. Streak fineness of 13
000 denier, the elastic mesh has an average apparent density of 0.
Table 2 shows the characteristics of the laminated elastic structure produced in the same manner as in Example 2 except that the elastic net body of 21 g / cm ³ was used and the pseudo crystallization treatment was not performed. Since the comparative example 7 has a high apparent density,
The cushioning material had a good touch but was slightly inferior in sitting comfort, and had insufficient heat resistance and durability.

COMPARATIVE EXAMPLE 8 A nozzle having a width of 50 cm and a length of 5 cm and having a staggered arrangement of 4 mm in the width direction and 3 mm in the length direction and having a orifice diameter of 1 mm was used for each single hole. Of a filament obtained in the same manner as in Comparative Example 3 except that the discharge amount was 0.012 g / min, the take-up conveyor net was placed 5 cm below the nozzle surface, and the line was taken at 1.5 m / min. Fineness is 4
The net density of the laminated elastic structure is 0.009 g using a mesh body having 0 denier and an apparent density of 0.008 g / cm ^3.
Table 2 shows the characteristics of the laminated elastic structure produced in the same manner as in Comparative Example 7 except that the laminated elastic structure was compressed to have a pressure of / cm ³ . Comparative Example 8 is a cushion material having a fine mesh with a fine linear fineness as a cushion layer, and the apparent density is too low to cause a large sinking, a large floor feeling, and a slightly inferior sitting comfort. .

Comparative Example 9 In the state where the short fibers prepared in Example 1 were opened and laminated, the mesh of Example 2 was cut and formed into a bucket sheet shape and laminated to cover the side cloth to make a seat for comfortable sitting. Evaluation result,
It was found that the open-laminating web of short fibers had a poor buttock touch and did not fully function as a surface layer.

Example 5 The laminated elastic structure obtained in Example 1 was cut into a length of 120 cm and quilted into a width of 120 cm and a length of 200 cm, which was quilted every 5 cm in thickness, 120 cm in width and 50 cm in length. It was created. Put this mattress on the bed and
The panel comfort was sensory-evaluated by allowing 4 panelists to use it for 7 hours in a room with a RH of 65%. The bed is covered with sheets and the comforter is 1.8 kg down / feather: 90/1.
0 was used as batting, and the pillow was worn by the paneler every day. As a result of the evaluation, the bed was a bed which had no feeling of flooring, had a moderate depression, and did not feel stuffy and had a comfortable sleeping comfort. For comparison, a density of 0.04 g / cm ³ and a thickness of 10
Create a similar mattress with a cm urethane foam plate,
As a result of placing it on a bed and evaluating the comfort of the bed, it was a bed with a low feeling of flooring but a large degree of sinking and a slight stuffiness, which was uncomfortable to sleep.

[0035]

EFFECTS OF THE INVENTION Striations made of thermoplastic elastic resin having good vibration and stress absorption form a three-dimensional structure and are fused and integrated to form a net-like body having a substantially flat surface as a cushion layer. The laminated elastic structure of the present invention in which a short fiber non-woven fabric composed of a thermoplastic elastic resin having good stress absorption and a surface layer is integrally bonded is improved in vibration isolation, heat resistance durability, bulkiness and sitting comfort. , A cushioning material that does not easily get damp, and is covered with a side material as it is or used in combination with other materials to provide the above-mentioned preferable characteristics to vehicle seats, ship seats, vehicle seats, ship seats, hospitals, hotels, etc. Can provide products such as business beds, furniture cushions, and bedding products. Furthermore, it is also useful as an interior material and a heat insulating material for vehicles and building materials.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location D01F 6/86 301 B

Claims (6)

[Claims] 1. A three-dimensional three-dimensional structure in which continuous filaments made of a thermoplastic elastic resin having a fineness of 100 to 100,000 denier are bent and brought into contact with each other so that most of the contact portions are fused. , One side of a net-like body whose both sides are substantially flattened has a short fiber made of a thermoplastic elastic resin and having a fineness of 20 denier or less, which is three-dimensionally opened, and most of the contact portion is melted by heat bonding. The non-woven fabric whose bonded and integrated surface is substantially flat has a bonded and integrated density of 0.01.
Laminated elastic structure of g / cm ³ to 0.2 g / cm ³ . 2. The laminated elastic structure according to claim 1, wherein the cross-sectional shape of the continuous filament is a hollow cross section or an irregular cross section. 3. The laminated elastic structure according to claim 1, wherein the thermoplastic elastic resin forming the continuous filament has an endothermic peak at a temperature of room temperature or higher and melting point or lower in a melting curve measured by a differential scanning calorimeter. 4. A thermoplastic elastic resin is discharged downward from the nozzle at a melting temperature higher by 20 to 80 ° C. than the melting point of the multi-row nozzle having a plurality of orifices, and the thermoplastic elastic resin is brought into contact with each other in a molten state to be fused. While forming a three-dimensional structure,
A method for producing a laminated elastic structure, in which a web with opened short fibers made of a thermoplastic elastic resin is laminated on one side after being sandwiched by a take-up device and cooled in a cooling tank, and thermoformed while being compressed. 5. The method for producing a laminated elastic structure according to claim 4, wherein after cooling once, annealing is performed at a temperature of at least 10 ° C. or lower than the melting point of the thermoplastic elastic resin. 6. A vehicular seat, a vehicular seat, a vehicular, a marine, a hospital, etc. commercial and household bed, a furniture chair, and an office chair using the laminated elastic structure according to claim 1. And the product described in any of the futons.