JP2017125267A - Fiber structure and method of manufacturing the same, and conjugate fiber structure and cushioning material for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fiber structure capable of reducing environmental load, giving a cushioning material good in pressure resistance distribution, light, and small in bottom touch feeling, and giving a sound absorption material and a thermal insulation material excellent in sound absorbency and adiabaticity, a method of manufacturing the same, a conjugate fiber structure, and a cushioning material for a vehicle.SOLUTION: The fiber structure containing a main fiber and a heat-adhesive short fiber, and having fastened points obtained by fusing the heat adhesive short fibers each other in an intersecting state and/or fastened points obtained by fusing the heat adhesive short fibers with the main fibers in an intersecting state includes a main fiber recycled with the main fiber, and a heat adhesive short fiber recycled with the heat adhesive short fiber.SELECTED DRAWING: Figure 2

Description

  The present invention can not only reduce the environmental load, but also when used as a cushioning material, the pressure resistance distribution is good and light and has a low feeling of bottoming, and when used as a sound absorbing material or heat insulating material, The present invention relates to a fiber structure and a method for manufacturing the same, and a composite fiber structure and a vehicle cushioning material that have extremely good heat insulation properties.

  Conventionally, after blending heat-adhesive short fibers and polyester fibers as cushioning materials, sound absorbing materials, heat insulating materials, etc., heat treatment is performed once or without heat treatment, and then the fiber material is inserted into a mold or the like and then heat treated. Or a fiber structure obtained by arranging fibers in the thickness direction in the fiber structure (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). In recent years, it has been proposed to configure a fiber structure using repellent fibers obtained by opening a used fabric or the like in order to reduce the environmental load (see, for example, Patent Document 4). Such fiber structures include polyester-type repelled fibers having various single fiber finenesses.

  However, when such a fiber structure is used as a cushioning material, the effect is manifested by uniformly mixing the heat-adhesive short fibers. There was no adhesion between the two, causing a variation in quality. Even when used as a sound-absorbing material or a heat-insulating material, the non-uniform dispersion of the heat-adhesive short fibers has caused variations in physical properties including poor appearance.

JP-A-8-318066 JP 2010-144362 A JP 2001-207366 A JP 2012-112072 A

  The object of the present invention is not only to reduce the environmental load of the present invention, but also when used as a cushioning material, the pressure distribution is good and light, and also has a low feeling of bottoming, and is used as a sound absorbing material and heat insulating material. It is an object of the present invention to provide a fiber structure, a method for manufacturing the same, a composite fiber structure, and a vehicle cushion material, in which sound absorption and heat insulation are extremely good.

  The present inventor reduces the environmental load by using the recycled main fiber and the recycled heat-bondable short fiber when manufacturing a fiber structure composed of the main fiber and the heat-bondable short fiber. When used as a cushioning material, the fiber has a good pressure distribution, light weight and little bottoming, and when used as a sound-absorbing material or heat-insulating material, it has extremely good sound-absorbing properties and heat-insulating properties. The present inventors have found that a structure can be obtained, and have further intensively studied to complete the present invention.

  Thus, according to the present invention, “a fixing point including a main fiber and a heat-adhesive short fiber, which is heat-sealed in a state where the heat-adhesive short fibers intersect with each other and / or the heat-adhesive short fiber and the main object”. A fiber structure having a fixing point thermally fused in a state of intersecting with a fiber, the main fiber including the recycled main fiber, and the heat-adhesiveness recycled to the heat-adhesive short fiber A fiber structure characterized in that it comprises short fibers. "

At that time, the heat-adhesive short fiber is composed of a heat-adhesive component and a non-heat-adhesive component, and the heat-adhesive component has a melting point 40 ° C. or more lower than the polymer component constituting the non-heat-adhesive component It is preferable to have. Further, it is preferable that both the recycled main fiber and the recycled heat-bondable short fiber are made of process end materials. In the recycled main fiber and the recycled heat-bondable short fiber, both preferably have an average fiber length in the range of 20 to 70 mm. The total weight of the recycled main fiber and the recycled heat-bondable short fiber is preferably in the range of 5 to 60% by weight with respect to the weight of the fiber structure. In the fiber structure, it is preferable that the main fibers and the heat-adhesive short fibers are arranged in the thickness direction of the fiber structure. Moreover, it is preferable that the thickness of a fiber structure exists in the range of 2-200 mm. Moreover, it is preferable that the average density of a fiber structure exists in the range of 5-60 kg / m < ³ >.

According to the present invention, a composite fiber structure is provided in which a sheet-like material having a thickness of 0.01 mm or more is bonded to the fiber structure. Such a composite fiber structure is preferably subjected to hot pressing.
Moreover, according to this invention, the cushion material for vehicles formed using the said fiber structure or composite fiber structure is provided.
Further, according to the present invention, there is provided a method for producing the fiber structure, wherein the fixing point is heat-sealed in a state where the heat-adhesive short fibers intersect with each other using main fibers and heat-adhesive short fibers. And / or obtaining a fiber structure having a fixing point that is heat-sealed in a state where the heat-adhesive short fibers and the main fibers intersect with each other, and using at least a part of the fiber structure, heat bonding For producing a fiber structure having a fixing point that is heat-sealed in a state where adhesive short fibers cross each other and / or a fixing point that is heat-sealed in a state where heat-adhesive short fibers intersect with main fibers A method of manufacturing a structure is provided.

  According to the present invention, not only can the environmental load be reduced, but also when used as a cushioning material, the pressure distribution is good and lightweight, and the feeling of bottoming is low, and when used as a sound absorbing material or heat insulating material, A fiber structure and a method for producing the same, and a composite fiber structure and a vehicle cushion material are obtained with extremely good performance.

It is a figure for demonstrating the direction of the arrangement | sequence of a heat bondable composite staple fiber or an inelastic staple fiber in a fiber structure. It is a figure which shows typically a mode that the sheet-like object is bonded together to the fiber structure through the contact bonding layer.

  Hereinafter, embodiments of the present invention will be described in detail. As main fibers, natural fibers such as cotton, wool and hemp, regenerated fibers such as rayon, synthetic fibers such as polyethylene, polypropylene, nylon, acrylic and polyester, aramid fibers, carbon fibers, etc. It may be a mixture of used cloths and repellent fibers made of carpet fiber products. Synthetic fibers are preferred because they are easy to handle and durable. Polyester fibers are particularly preferable.

  The polyester fibers include polyethylene terephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyhexamethylene terephthalate, polytetramethylene terephthalate, poly-1,4-dimethylcyclohexane terephthalate, polyethylene naphthalate, polypivalolactone, polylactic acid ( PLA), stereocomplex polylactic acid, biopolyester, or a fiber composed of a single component thereof, or a composite fiber including these components as one component.

  Next, the heat-adhesive short fiber may be a single-component fiber, but a heat-adhesive composite short fiber composed of two or more components of a heat-adhesive component and a non-heat-adhesive component is preferable. In that case, it is preferable that a thermoadhesive component has melting | fusing point lower 40 degreeC or more than the polymer component which comprises a non-thermoadhesive component. If this temperature difference is less than 40 ° C., the adhesion is insufficient, and there is a risk that the fiber structure will be dull and difficult to handle.

Here, examples of the polymer disposed as the heat-adhesive component include elastomeric polymers and copolymer polyester polymers, and polyolefin polymers such as low density polyethylene, high density polyethylene, and polypropylene.
Among the above heat-adhesive components, the cushion application is particularly preferable in that polyester elastomer has high adhesive strength and elasticity. For sound absorption and heat insulation, a copolyester polymer is particularly preferable. In addition, various stabilizers, ultraviolet absorbers, thickening branching agents, matting agents, coloring agents, other various improving agents, and the like may be blended in the above-described polymer as necessary.

  In the heat-bonded composite short fibers, the non-adhesive component is represented by polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalene dicarboxylate (PEN), polylactic acid (PLA), and copolymers thereof. Polyester such as nylon, nylon 6 and nylon 66, other polyolefin, acrylic and the like. Of these, polyester is preferred. Polyester is further reduced in environmental impact by using material recycled by bottle recycling and chemical recycled polymer. Furthermore, as the polyester, a biopolyester using raw materials made from plants may be used. In such a polymer, a coloring agent, various stabilizers, an ultraviolet absorber, a thickening branching agent, a matting agent, and other various improving agents may be blended.

  Here, it is preferable that the heat-adhesive component occupies at least 1/2 of the surface area. The weight ratio of the heat-adhesive component and the non-adhesive component is preferably in the range of 30/70 to 70/30 as a composite ratio. The form of the heat-adhesive composite short fiber is not particularly limited, but the heat-adhesive component and the non-adhesive component are preferably side-by-side and core-sheath types, more preferably the core-sheath type. In this core-sheath-type heat-adhesive composite short fiber, the non-adhesive component becomes the core and the heat-adhesive component becomes the sheath, but the core may be concentric or eccentric.

In such a heat-adhesive composite short fiber, the single fiber diameter is preferably in the range of 20 to 50 μm. The fiber length is preferably cut to 10 to 100 mm.
Moreover, it is preferable that crimps, such as a mechanical crimp by a normal indentation crimper system, are given to such heat-adhesive composite short fibers.

  In the present invention, it is important that the main fiber includes the recycled main fiber, and the heat-adhesive short fiber includes the recycled heat-adhesive short fiber. As the recycled main fiber and the recycled heat-bondable short fiber, a material recycled fiber is preferable. In particular, it is preferably made of a process end material (hereinafter, also referred to as “process recycled ground fiber”).

  Process-recycled repellent fibers can be used as offcuts in non-woven fabric processes, molding processes and the like, as well as part-off products, poor quality products, and consumer products before consumption. Such fibers are those obtained by collecting a fiber structure in which main fibers and heat-adhesive fibers are mixed and returning them to short fibers or the like by using a cutting and bristling facility.

  Here, the process-recycled repellent fiber needs to contain a main fiber and an adhesive short fiber. If an anti-hair treatment (recycle treatment) is performed in a state where the two are bonded, a part of the adhesion points remains after the anti-hair treatment, so that an anti-hair fiber can be produced while maintaining the bulkiness. When used as a cushioning material, the cushioning properties are excellent. In addition, the entanglement of the fibers is improved and the card property is also improved. In addition, since it is a repellent fiber in which the main fiber and the heat-adhesive short fiber are mixed, the bonding points are more uniformly dispersed than those obtained by repelling a cloth or the like that does not contain the adhesive fiber. A fiber structure with little variation can be obtained.

Various methods can be used to obtain process-recycled repellent fibers, but when trimming trims such as molded products are used, the density increases and the repelling conditions are optimized to obtain the target fiber length. Is preferred.
As a process, the collected mill ends are cut into a shape that is easy to handle using a guillotine cutter, a rotary cutter or the like, and then put into a repelling machine. As the repelling machine, a cylinder type product is preferable in terms of productivity. The cylinder has needles such as a pin type and metallic wire, and the type and needle density can be selected according to the material to be bristled. Furthermore, it is preferable to optimize the number of cylinders in order to reduce the amount of unopened fluff.

  Moreover, in the said process recycle anti-rib fiber, it is preferable that it is in the range of 20-70 mm as fiber length. If the fiber length is less than 20 mm, sufficient strength and rigidity may not be obtained when a fiber structure is formed. Moreover, in a card | curd process, it becomes a factor of omission between rollers and there exists a possibility that workability may become very bad. On the contrary, if the fiber length is longer than 70 mm, the process stability may be impaired, and at the same time, a nep is likely to occur, the appearance and the texture are poor, and the blending property is insufficient and the quality is low. There is a risk of variation.

  In the fiber structure of the present invention, the process-recycled repellent fiber is composed of a main fiber and a heat-bonded composite short fiber, and the total weight thereof is 5 to 60% by weight (more preferably 10 to 50% by weight) relative to the fiber structure weight. It is preferable that If the weight ratio is less than 5% by weight, uniform blending may be difficult. On the other hand, if it exceeds 60% by weight, there is a risk of problems in cushioning properties, handling properties, and the like.

  The fiber structure of the present invention includes a main fiber and a heat-adhesive short fiber, and is bonded to the heat-bonded short fiber in a state where the heat-adhesive short fibers cross each other and / or the heat-adhesive short fiber and the main body. A fiber structure having a fixing point thermally fused in a state of intersecting with a fiber, the main fiber including the recycled main fiber, and the heat-adhesiveness recycled to the heat-adhesive short fiber Short fibers are included.

  Here, it is preferable that the main fibers and the heat-bondable short fibers are arranged in the thickness direction of the fiber structure. “Arranged in the thickness direction” means that the total number of fibers arranged in parallel to the thickness direction of the fiber structure is (B) and is perpendicular to the thickness direction of the fiber structure. When the total number of fibers arranged in (A) is (A), B / A is 1.5 or more. That is, since the constituent fibers are arranged in parallel to the thickness direction of the fiber structure, it is possible to obtain a fiber structure having excellent cushion feeling, high resilience, light weight, and good moldability. In particular, polyester fibers are fibers that are generally higher in rigidity than natural fibers. However, in the case of a repellent fiber, since the fiber length includes a short fiber, it is perpendicular to the thickness direction of the fiber structure (thickness direction and horizontal). It is difficult to increase the bulk. However, by arranging the constituent fibers in the thickness direction of the fiber structure, even if a fiber having a short fiber length is included, the contribution ratio of the rigidity of the fiber itself is high, and the bulk becomes bulky and light weight can be achieved.

  The method for producing such a fiber structure is not particularly limited, and any conventionally known method may be arbitrarily adopted. For example, after blending non-heat-adhesive composite short fibers and heat-adhesive composite short fibers and spinning them as a uniform web with a roller card, heat-treat the web while folding it into an accordion to form a fixing point by thermal fusion. The method of making it preferable is illustrated. For example, a device disclosed in Japanese Translation of PCT International Publication No. 2002-516932 (for example, commercially available Strut equipment manufactured by Struto Corporation) may be used.

The average density of the fiber structure thus obtained is preferably in the range of 5 to 60 kg / m ³ . If the density is less than 5 kg / m ³ , sufficient rigidity may not be obtained. On the contrary, when the average density exceeds 60 kg / m ³ , it becomes plate-shaped and not only becomes difficult to be molded thereafter, but also has poor cushioning properties and becomes hard, which may not be used as a fiber structure. There is also a risk of weight increase.

  In the fiber structure of the present invention, the thickness of the entire fiber structure is preferably in the range of 2 to 200 mm (more preferably 3 to 100 mm). When the thickness is within this range, the cushioning property is also excellent, so it is suitable as a vehicle seat for automobile wading, furniture cushions, bed mattresses, type futons, and automobiles, bullet trains, trains, etc. Can be used. Furthermore, it is preferable that the thickness is within this range because it exhibits not only excellent sound absorption / characteristics but also excellent rigidity.

In such a fiber structure, not only can the environmental load and the manufacturing cost be reduced by using the process recycled anti-fiber, but the process recycled anti-fiber includes fibers having various single fiber finenesses. Therefore, when used as a cushioning material, the pressure distribution is good and light, the feeling of bottoming is small, and when used as a sound absorbing material or heat insulating material, the sound absorbing property and heat insulating property are extremely good, and there is little variation in quality. Become.
Such a fiber structure may be subjected to normal dyeing or raising. Furthermore, known functional processing such as water repellent processing, flameproof processing, flame retardant processing, and negative ion generation processing may be added.

Next, the composite fiber structure of the present invention is obtained by bonding a sheet-like material to the fiber structure.
As the sheet-like material, a non-woven fabric by a direct spinning method such as melt blow, spun bond or flash bond, a non-woven fabric by a short fiber structure by an air laid or card method, a needle punched product thereof, and a non-woven fabric mixed with adhesive fibers are heat treated. In addition, there are a sheet obtained by heat pressing, a sheet having a combination of these, a film, a woven or knitted fabric, and a sheet obtained by heat pressing the fiber structure of the previous period.

  In general, a repellent fiber is a process of repelling a fiber with a cloth or the like, and includes a fiber having a very short fiber length. Therefore, when arranged in the thickness direction of the fiber structure, the entanglement between the fibers becomes weak. By attaching the objects, the strength in the arranged direction is increased. Moreover, it is possible to prevent the fibers of the fiber structure in which the fibers are arranged in the thickness direction from being scattered. Furthermore, by laminating these sheet-like materials, it is possible to increase ventilation resistance and increase sound absorption by membrane vibration. Furthermore, by laminating the sheet material and the fiber structure, compression in the thickness direction is possible. Hardness is greatly improved.

As the thickness of the sheet-like material, the thickness is 0.01 mm or more (more preferably 0.01 mm to 5 mm, more preferably 0.1 mm in consideration of strength, economy, and workability when used as a wall material. ~ 2mm) is preferred. The apparent density is preferably in the range of 100 to 500 kg / m ³ .

  As the material constituting the sheet-like material, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalene dicarboxylate (PEN), polylactic acid (PLA) and polyesters typified by these copolymers, Synthetic fibers or films composed of polyamides such as nylon 6 and nylon 66, other polyolefins, acrylics, modacrylic, etc., natural fibers such as silk, cotton, hemp, wool, rayon fibers, and anti-fibers containing these fibers And hair fibers. Among these, a polyester-based sheet is preferable from the viewpoint of easy recyclability and moldability. Note that the sheet-like material may be arranged on the back surface, the side surface, and the inner layer of the fiber structure in addition to one surface.

  As a method of bonding the fiber structure and the sheet-like material, a method of heating and pressing the fiber structure and the sheet-like material, a method of mechanically joining with a needle or the like, or via an adhesive layer There is a method of bonding. The adhesive layer is preferably a non-woven fabric made of a hot-melt type resin or a low-melting resin fiber that is first melt-bonded by heat, such as powder, sheet, or net. At that time, the composition of the low melting point resin or the low melting point resin fiber may be a urethane type resin, an acrylic type resin or the like, but a polyester type adhesive or adhesive sheet is preferred from the viewpoint of recyclability. Furthermore, it is also preferable to heat-press in the process before or after bonding the fiber structure and the sheet-like material.

  Further, when the fiber structure and the sheet-like material are bonded together, the sheet-like material may be bonded as it is in the state of the fiber structure obtained by the manufacturing method, and the fiber structure is bonded in the thickness direction. After slicing with a slicer facility or the like approximately perpendicularly or obliquely as necessary, the sheet-like material may be bonded.

  Next, the vehicle cushion material of the present invention is a cushion material using the fiber structure or the composite fiber structure. Such a cushioning material includes process recycled garnet fibers having various single fiber fineness as the main fiber and the heat-adhesive short fiber, so that the pressure distribution is good and light, and the feeling of bottoming is low. In particular, when the constituent fibers are arranged in the thickness direction of the fiber structure, the effect becomes more remarkable.

The fiber structure or the composite fiber structure is also suitably used as a cushion material (such as bedding), a sound absorbing material, and a heat insulating material other than a vehicle.
For example, in the case of a sound-absorbing material, process recycled anti-fibers are included, so there is a cushion feeling and there is little quality variation. In particular, when the constituent fibers are arranged in the thickness direction of the fiber structure, the effect becomes more remarkable. In the case of a heat insulating material, since the process recycled anti-fiber is included, the performance is extremely good, and there is little variation in quality. In particular, when the constituent fibers are arranged in the thickness direction of the fiber structure, the effect becomes more remarkable.

  Next, although the Example and comparative example of this invention are explained in full detail, this invention is not limited by these. In addition, each measurement item in an Example was measured with the following method.

(1) Melting point Using a differential thermal analyzer 990 manufactured by Du Pont, measured at a temperature increase of 20 ° C./min, and obtained a melting peak. If the melting temperature is not clearly observed, the melting point is the temperature at which the polymer softens and starts to flow (softening point) using a trace melting point measuring device (manufactured by Yanagimoto Seisakusho). In addition, the average value was calculated | required by n number 5.

(2) Average fiber length A single fiber is taken out one by one, stretched straight on a velvet plate without stretching the fiber, and the fiber length is measured to mm. This is repeated 50 times, and the average fiber length (mm) is calculated. Repeat this twice. The average value was obtained.

(3) B / A
The fiber structure is cut in the thickness direction, and in the cross section, the total number of fibers (0 ° ≦ θ ≦ 45 ° in FIG. 2) arranged parallel to the thickness direction is (B), and the fibers B / A was calculated with (A) being the total number of fibers (45 ° <θ ≦ 90 ° in FIG. 2) arranged perpendicular to the thickness direction of the structure. In addition, the measurement of the number was carried out by observing 30 fibers for each of 10 arbitrary positions with a transmission optical microscope, and counting the number.

(4) Sound absorption characteristics (sound absorption rate)
The sound absorption coefficient was a normal incident sound absorption coefficient according to JIS-A1405, and was measured by a two-microphone method using a multichannel analysis system 3550 type (software: BZ5087 type 2-channel analysis software) manufactured by Bruel & Kjar. The sound absorption rate was compared at 1000 Hz, 2000 Hz, and 4000 Hz.

(5) Thickness (mm) of fiber structure, composite fiber structure, sheet-like material
It was measured according to JIS K6401.

(6) Hardness of fiber structure and composite fiber structure (N)
It was measured according to JIS K6401. In addition, the numerical value of Table 1 is a value at the time of 25% compression of thickness.

(7) Moldability A mold having an inner diameter of 60 mm, a height of 20 mm, and a thickness of 5 mm was used, and a fiber structure or a composite fiber structure was hot-drawn for 180 seconds at a mold temperature of 190 ° C. The appearance of this sample was observed and evaluated according to the following criteria.
Third grade: The height excluding the thickness exceeded 15 mm, and the surface was cleanly molded.
Grade 2-3: Height excluding thickness is more than 15mm, but slight wrinkles are observed on the surface. Grade 2: Height excluding thickness is about 5-15mm, and wrinkles are seen on the surface. It is done.
Level 1-2: The height excluding the thickness is about 5 to 15 mm, and the surface is considerably wrinkled.
First grade: The height excluding the thickness is less than 5 mm, and the mark of the mold is made.

[Example 1]
Core / sheath type thermo-adhesive composite short fiber having a single fiber fineness of 6.6 dtex and a fiber length of 51 mm using a thermoplastic polyetherester type elastomer having a melting point of 154 ° C. as a sheath component and a melting point of 230 ° C. polybutylene terephthalate as a core component A (core / sheath ratio = 60/40: weight ratio) and 6.6 dtex, polyester fiber main fiber B having a fiber length of 51 mm were mixed in a weight ratio of 30:70, and then the roller card, cross lay, roller card Next, using a Struto equipment manufactured by Struto, the web was folded and most of the fibers were arranged in the thickness direction (B / A = 4.7), and then the fibers were heated in a heat treatment furnace at a temperature of 200 ° C. A fiber structure was obtained by heat-bonding the gap. The end material after cutting of the bed mattress, which is thermoformed from this fiber structure, is processed and recycled using a roller rotating type of repelling equipment using metallic wires. And recycled thermal adhesive short fibers). The average fiber length was 38 mm.

After blending the heat-adhesive composite short fiber A, the main fiber B, and the process recycled fluff fiber C used in the previous fiber structure at a weight ratio of 24:56:20, a roller card, a crosslay, and a roller card Then, using a STRUTO equipment manufactured by STRUTO, the web was folded and the majority of the fibers were arranged in the thickness direction (B / A = 4.7). There wasn't. A fiber structure was obtained by heat bonding between the fibers in a heat treatment furnace. The obtained fiber structure had a thickness of 30 mm and a density of 45 kg / m ³ . As a result of measuring the hardness, it was 360N.
When the cushion material for vehicles was obtained using this fiber structure, there was a feeling of cushion and it was a desirable thing.

[Example 2]
As the heat-adhesive short fiber A, an amorphous copolyester having a melting point of 110 ° C. is arranged in the sheath component, and a normal sheath-type heat fusion composite fiber 2.2 dtex × 51 mm in which ordinary polyethylene terephthalate is arranged in the core component. 30% by weight, polyester fiber 6.6 dtex × 51 mm 70% by weight as the main fiber B, and after cotton blending, the roller card, the crosslay, and the roller card are passed in this order, and then the Struto equipment manufactured by Struto is used. Used, the web is folded and the majority of the fibers are arranged in the thickness direction (B / A = 4.7), followed by heat treatment at 170 ° C., and a fiber structure having a basis weight of 540 g / m ² and a thickness of 25 mm. After being obtained, it was molded. The trimmed scrap was collected. Among them, the one having a thickness of 12.5 mm was included. Using recycled roller-type rebellious equipment using cutting and metallic wire, process recycle repellent fibers C (including recycled polyester fibers and recycled heat-adhesive short fibers) were prepared. The average fiber length was 32 mm.
Again, the heat-adhesive short fibers A, the main fibers B, and the process-recycled repelled fibers C were blended at a weight ratio of 21:49:30 in this order, and creased in the same manner as in Example 1. A fiber structure was obtained. The evaluation results are shown in Table 1.

[Example 3]
The heat-adhesive fiber A and the main fiber B used in Example 2 and the process recycled anti-fiber fiber C, and the polyester anti-fiber fiber D obtained by repelling the polyester fabric were in this order by weight ratio of 20:30: A sheet-like fiber structure that was blended at a ratio of 30:20 and folded in the same manner as in Example 1 was obtained. The evaluation results are shown in Table 1.

[Example 4]
While simultaneously winding a 0.3 mm thick spunbond nonwoven fabric (Precize (trade name), manufactured by Asahi Kasei Co., Ltd.) on the fiber structure obtained in Example 3, belt type laminating equipment was used. Then, thermocompression bonding and cooling were performed to prepare a fiber structure. The evaluation results are shown in Table 1.

[Example 5]
A fiber structure having the basis weight and thickness described in Table 1 was obtained with the same fiber blending as in Example 2. It was pressed with a belt-type heating press to obtain a sheet having a thickness of 1 mm. And the fiber structure of Example 3 and the 1 mm sheet | seat were bonded together using the polyester powder. The evaluation results are shown in Table 1. Furthermore, when the needle punched nonwoven fabric was pasted together, it became cushioned and could be used as a car floor.

[Comparative Example 1]
Thermally-adhesive fibers A and main fibers B used in Example 2 and polyester-repellent fibers D obtained by re-bending the polyester fabric (recycled polyester fibers, which do not contain heat-adhesive short fibers). ) Were blended at a weight ratio of 20:30:50 in this order, and a sheet-like fiber structure that was folded was prepared in the same manner as described above, and the hardness and sound absorption were measured. In addition, it was confirmed that there was a lump of polyester repellent fibers partially, adhesion was insufficient, and there was a soft part.

  According to the present invention, not only can the environmental load be reduced, but also when used as a cushioning material, the pressure distribution is good and lightweight, and the feeling of bottoming is low, and when used as a sound absorbing material or heat insulating material, A fiber structure and a method for producing the same, and a composite fiber structure and a vehicle cushion material are obtained, and the industrial value of the fiber structure is extremely large.

1: Main fiber or heat-adhesive composite short fiber 2: Thickness direction of fiber structure 3: Arrangement direction of main fiber or heat-adhesive composite short fiber 4: Fiber structure 5: Sheet-like material 6: Adhesive layer 7: Fiber structure

Claims (12)

  A fixing point that includes a main fiber and a heat-bondable short fiber and is heat-sealed in a state in which the heat-bondable short fibers cross each other and / or heat in a state in which the heat-bondable short fibers and the main fibers cross. A fiber structure having a fusion-bonded fixing point, wherein the main fiber includes the recycled main fiber, and the heat-adhesive short fiber is recycled to the heat-adhesive short fiber. A fiber structure.   The heat-adhesive short fiber is composed of a heat-adhesive component and a non-heat-adhesive component, and the heat-adhesive component has a melting point lower by 40 ° C. or more than the polymer component constituting the non-heat-adhesive component, The fiber structure according to claim 1.   The fiber structure according to claim 1 or 2, wherein both the recycled main fibers and the recycled heat-bondable short fibers are made of process end materials.   The fiber structure according to any one of claims 1 to 3, wherein an average fiber length is in a range of 20 to 70 mm in both the recycled main fiber and the recycled heat-bondable short fiber.   The total weight of the recycled main fiber and the recycled heat-bondable staple fiber is in the range of 5 to 60% by weight with respect to the weight of the fiber structure. Fiber structure.   The fiber structure according to any one of claims 1 to 5, wherein in the fiber structure, the main fibers and the heat-adhesive short fibers are arranged in the thickness direction of the fiber structure.   The fiber structure in any one of Claims 1-6 whose thickness of a fiber structure exists in the range of 2-200 mm. The fiber structure in any one of Claims 1-7 whose average density of a fiber structure exists in the range of 5-60 kg / m < ³ >.   A composite fiber structure obtained by bonding a sheet-like material having a thickness of 0.01 mm or more to the fiber structure according to claim 1.   The composite fiber structure according to claim 9, which is subjected to hot pressing.   The cushion material for vehicles formed using the fiber structure in any one of Claims 1-8, or the composite fiber structure in any one of Claim 9,10.   It is the manufacturing method of the fiber structure of Claim 1, Comprising: The fixing point and / or the said which were heat-sealed in the state which the said heat-adhesive short fiber crossed using the main fiber and the heat-adhesive short fiber, and / or After obtaining a fiber structure having a fixing point that is heat-sealed in a state where the heat-adhesive short fiber and the main fiber intersect, the heat-adhesive short fibers are bonded to each other using at least a part of the fiber structure. Manufacture of a fiber structure having a fixing point that is heat-sealed in a state in which the fibers are crossed and / or a fixing point that is heat-sealed in a state where the heat-adhesive short fibers and the main fiber are crossed Method.

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