JPH11302960A - Bulky, laminated, formed body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulky, laminated, formed body, excellent in bulkiness and thermal insulation, and suitable for insulators and cleaning tools, e.g. wiping cloth. SOLUTION: This bulky, laminated, formed body comprises (A) a non-woven fabric composed of thermoplastic, hollow, parallel type composite long fibers of at least two components of thermoplastic resins different in melting point by at least 10 deg.C, and having an elliptic fiber section and fiber diameter of 1 to 8 d/f, and (B) a melt-blown non-woven fabric composed of at least one type of thermoplastic resin, having an average fiber diameter of 1 d/f or less, and placed at least one side of the non-woven fabric A, wherein the thermoplastic, hollow, parallel type long fiber has manifest crimps and the non-woven-fabrics A and B are joined with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a bulky laminated molded article. More specifically, bulkiness, bulk recovery, lightness,
The present invention relates to a bulky laminated molded article which is suitably used as a cleaning tool such as a heat insulating material or a wiping cloth which requires characteristics such as heat retention.

[0002]

2. Description of the Related Art Conventionally, hollow long-fiber non-woven fabrics are made of continuous long fibers, so that when they are polished using the same, there is almost no drop off of lint due to friction, and they have both lightness and heat retention. It was attracting attention as a material. In recent years, studies have been made to use a hollow long-fiber nonwoven fabric for a cleaning cloth such as a wiping cloth. The wiping cloth using this nonwoven fabric hardly caused the lint or the like to fall off or fluff, and was able to collect to a certain extent, but the collecting performance was not satisfactory because of its low bulk. When a nonwoven fabric is used as a component of the wiping cloth, it is necessary to reinforce the nonwoven fabric with a reinforcing material, and is usually used by being bonded to a monofilament net. However, when a monofilament net is used, it is difficult for dust and debris to be collected at the periphery of the net, and improvement is desired.

Further, Japanese Patent Application Laid-Open No. 62-206008 discloses a method in which one side of a porous hollow fiber discharged from a nozzle at the time of spinning is rapidly cooled to cause the fiber to exhibit crimp. However, since the porous hollow fiber obtained by this method has a complicated cross-sectional shape and surface structure of the fiber, only a fiber with a large denier of 30 d / f or more is obtained, and is used as a cleaning material such as a wiper. A long fiber having a fine denier crimp of 1 to 8 d / f, which is suitably used, cannot be obtained, and as a result, a molded article composed of a bulky long-fiber nonwoven fabric has not been obtained.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and to provide a bulky laminate which is excellent in bulkiness, bulk recovery, heat retention, and excellent in collecting dust and the like. Is to provide the body.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that a heat-adhesive hollow side-by-side composite continuous fiber having a hollow portion capable of expressing a three-dimensional crimp by shrinkage. By joining the melt-blown non-woven fabric with the melt-blown non-woven fabric, it was found that the bulkiness, bulk recovery and heat retention were excellent, and the dust collecting property was also good. It came to be solved. The present invention has the following configuration. (1) a nonwoven fabric (A) consisting of a thermoplastic hollow side-by-side composite continuous fiber of 1 to 8 d / f made of at least two-component thermoplastic resin having a melting point difference of 10 ° C. or more and having an elliptical fiber cross-sectional shape; An average fiber diameter of at least one component thermoplastic resin on at least one surface of the nonwoven fabric is 1 d / f
A bulky laminated molded article obtained by laminating the following melt-blown nonwoven fabric (B), wherein the thermoplastic hollow parallel-type composite continuous fiber is
A bulky laminated molded article having an apparent crimp, wherein the bulky laminated molded article is joined. (2) The bulky laminated molded article according to (1), wherein the thermoplastic hollow side-by-side composite conjugate long fiber is a polyolefin-based conjugate long fiber. (3) The bulky laminated molded article according to (2), wherein at least one of the resin components constituting the polyolefin-based composite long fiber is ethylene or a crystalline propylene copolymer containing ethylene and 1-butene. (4) The ratio of the major axis to the minor axis in the cross section of the thermoplastic hollow side-by-side composite long fiber is 1.1 to 1.6.
(3) The bulky laminated molded article according to any one of the above items. (5) The bulky laminated molded article according to any one of (1) to (4), wherein the ratio (hollow ratio) of the cross-sectional area of the hollow portion to the cross-sectional area surrounded by the outer peripheral portion is 10 to 40%. (6) The bulky laminated molded article according to any one of (1) to (5), wherein the fiber intersections are joined by thermocompression bonding. (7) The bulky laminated molded article according to any one of (1) to (5), wherein the fiber intersection is joined to the bulky laminated molded article by heat fusion. (8) A wiper using the bulky laminated molded article according to any one of (1) to (7) at least in part. (9) A heat insulating material using at least a part of the bulky laminated molded article according to any one of (1) to (7).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
Thermoplastic hollow side-by-side composite long fibers used in the present invention,
As shown in FIG. 1, a hollow structure in which at least two-component thermoplastic resins 1 and 2 having a melting point difference of 10 ° C. or more are joined in parallel at the peripheral portion of the fiber cross section, and the two-component thermoplastic resin is used. The resin has a fiber cross-sectional form in which the inner radial direction forms a hollow portion. The ratio of the cross-sectional area of the hollow portion to the cross-sectional area surrounded by the outer peripheral portion (hollow ratio) is preferably 10 to 40%, more preferably 10 to 30%. Here, when the hollow ratio is small, the amount of air in the hollow portion becomes small, and it becomes difficult to sufficiently exhibit heat retention, and further, the bulk recovery is also reduced. Conversely, when the hollow ratio increases, although the effect of reducing the weight of the nonwoven fabric is effective, since the area of the joint portion between the two-component thermoplastic resins constituting the composite long fiber is reduced, the fiber is peeled off by impact or the like. In addition, there is a tendency that the hollow portion is broken and the bulk recovery performance is reduced. In addition, the spinnability at the time of spinning is reduced, which also impairs the workability. The hollowness of the fiber is controlled by the shape and slit width of the discharge port in the spinneret, the discharge amount of the resin used, and the melt viscosity.

[0007] The volume ratio (corresponding to the area ratio of the cross section of a fiber cross section) of at least two components of the thermoplastic resin having a melting point difference constituting the thermoplastic hollow parallel type composite continuous fiber used in the present invention is: 30:70 to 70:30, preferably 40:60 to low melting point component: high melting point component.
60:40. When either component is less than 30, the flattening of the fiber increases, so that fusion occurs in the hollow portion at the time of spinning, and the hollowness decreases, and the spinnability deteriorates, which is not preferable.

[0008] Since the cross section of the thermoplastic hollow side-by-side conjugate continuous fiber used in the present invention has an elliptical structure, three-dimensional crimping is well exhibited, and the bulky laminated molded article of the present invention can be produced. Can be used most preferably. In addition, if the outer shape of the fiber cross-section has an irregular shape and a polygon approximate to an elliptical shape, and a three-dimensional crimp is generated by spinning, the component of the bulky laminated molded article of the present invention is used. Can be used as The elliptical fiber cross-section has a hollow parallel structure composed of a two-component thermoplastic resin and a hollow part existing in a radially inner layer thereof as shown in FIG. 1, and as shown in FIG. In other words, at the part where the two thermoplastic resins adhere to each other at a position symmetrical about the axis of the elliptical minor axis, the strain force due to shrinkage after molding of each resin functions most effectively, and crimps appear. The property is extremely large, which is preferable. The elliptical shape most preferably has a ratio of the major axis to the minor axis in the cross section of the thermoplastic composite filament in the range of 1.1 to 1.6. When this ratio decreases, the expression of three-dimensional crimps decreases, and when the ratio increases, the flattening of the hollow portion of the two-component resin proceeds in the spinning stage, the fiber shape is easily collapsed, and the spinnability is reduced. It tends to decrease. Here, the shape of the hollow portion may be any one of a circular shape, an elliptical shape, and a polygonal shape of a triangle or more, as long as crimp expression is not extremely reduced, and there is no particular problem. It does not matter if you keep in mind for the same reason.

The resin constituting the thermoplastic hollow side-by-side composite long fiber used in the present invention may be a polyolefin-based crystalline polymer such as low-density polyethylene, high-density polyethylene, or polypropylene, or a copolymer based on polyethylene or polypropylene. Examples thereof include a polyester resin such as polyethylene terephthalate and poly (ethylene terephthalate-co-isophthalate), and a polyamide resin such as nylon 6 and nylon 66. Polyethylene-based copolymers include propylene, 1-butene, 1-pentene, 1-hexene,
-Copolymers with olefins such as octene (for example, linear low-density polyethylene), ethylene vinyl acetate copolymer, ethylene ethyl acrylate copolymer, and the like. Further, the copolymer based on polypropylene is a copolymer with olefins such as ethylene, 1-butene, 1-pentene, 1-hexene and 1-octene. Among the above-mentioned resins, polyolefin-based resins are preferable from the viewpoint of chemical resistance.

Specific examples of copolymers based on polyethylene include, for example, 73 to 99% by weight of ethylene,
An ethylene-octene copolymer composed of 1 to 27% by weight of 1-octene (more preferably, an ethylene-octene copolymer composed of 75 to 98% by weight of ethylene and 2 to 25% by weight of 1-octene). Specific examples of polypropylene-based copolymers include ethylene-propylene copolymers comprising 85-99% by weight of propylene and 1-15% by weight of ethylene; 75-99% by weight of propylene, 1-25% by weight % Of 1-butene; butene-propylene copolymer; 84-97% by weight of propylene;
Binary or ternary copolymers such as an ethylene-butene-propylene copolymer composed of 1 to 15% by weight of 1-butene and 1 to 10% by weight of ethylene can be given. These copolymers can exhibit unique softness, and have good texture and softness, and are preferable. In addition, for the resin, for example, pigment, matting agent, deodorant,
Various additives such as a light stabilizer, an antioxidant, and a heat stabilizer can be added as long as the effects of the present invention are not impaired. However, the present invention is not particularly limited to this.

[0011] In the present invention, 2 having a melting point difference of not less than 10 ° C.
A combination of the thermoplastic resin components is preferably used. In the case of this composite long fiber, the bonding area between the thermoplastic resins is extremely small as compared with a normal composite fiber having no hollow portion. Therefore, it is most preferable to select a combination having good compatibility between the thermoplastic resins. If the compatibility between the thermoplastic resins is low, delamination occurs on the thermoplastic resin bonding surface, and various properties such as bulkiness and heat retention cannot be satisfied. For this reason, combinations of polyolefin resins having different melting points, polyester resins, or polyamide resins are preferable. In the case of polyolefin resins, a combination of polypropylene and polyethylene is also possible, but more preferably a combination of polyethylene resins such as homopolyethylene and a polyethylene-based copolymer, or a combination of homopolypropylene and a polypropylene-based copolymer. And polyester resins such as polyethylene terephthalate and copolymerized polyester, and polyamide resins such as nylon 66 and nylon 6. Among these, copolymers based on homopolypropylene and propylene or a combination of copolymers based on polypropylene having a different melting point are particularly preferable in view of chemical resistance and melting point range. still,
As the resin for the melt-blown nonwoven fabric, the above-mentioned thermoplastic resin can be used similarly.

The thermoplastic resin of at least two components referred to in the present invention can be used. However, unless there are special circumstances, two components are sufficient from the economical aspect. The melting point difference is the difference between the maximum melting point and the minimum melting point of the resin used. As the melting point, an endothermic peak was measured by a differential scanning calorimeter (DSC) using the nonwoven fabric as a sample after forming the nonwoven fabric, and the temperature at that time was used. Therefore, the temperature difference between the temperature of the endothermic peak with the highest melting point and the temperature of the endothermic peak with the lowest melting point that appears on the endothermic curve at that time is the melting point difference referred to in the present invention. Further, as the combination of the resins constituting the low melting point component and the high melting point component used in the present invention, it is preferable that the molding shrinkage ratios of the respective resins are different. Molding shrinkage refers to the ratio of the amount of shrinkage of the solidified resin to the mold, which occurs when the molten resin is molded, and is 0.01 to 0.025 mm / mm for PP and 0.02 to 0 for high-density polyethylene. 0.05 mm / mm, and for low-density polyethylene, it falls within the range of 0.015 to 0.05 mm / mm.
In particular, since the hollow parallel type composite continuous fiber in the present invention is continuous in the fiber length direction, if the molding shrinkage ratio is different, the force of the strain generated during shrinkage is transmitted spirally in the fiber length direction, It is believed that crimping occurs. This phenomenon is remarkable when the cross section of the composite long fiber has an elliptical structure.

The fineness suitably used for the hollow parallel type composite filament used in the present invention is 1 to 8 d / f, and these finenesses are appropriately selected according to the type and use of the material resin used. do it. For example, if the average fiber diameter is 0.0
When laminated with a 5 d / f melt blown nonwoven fabric and used as a wiping cloth, the fiber diameter of the composite long fiber is 1 to 5
d / f is preferred. Further, for example, the average fiber diameter is 0.9 d.
When laminated with a melt blown nonwoven fabric of / f and used as a heat insulating material, the fiber diameter of the conjugate fiber is preferably about 1 to 8 d / f.

The number of crimps of the hollow side-by-side conjugate long fibers constituting the bulky long-fiber nonwoven fabric of the present invention is preferably 6 crimps / 25 mm or more. When the number of crimps is less than 6 peaks / 25 mm, the bulk of the obtained nonwoven fabric is low. The number of crimps of 10 peaks / 25 mm or more is more preferable.

The melt-blown non-woven fabric used in the present invention may be any one of a single fiber, a composite fiber and a mixed fiber, and those having an average fiber diameter of 1 d / f or less are preferably used. The basis weight is not particularly limited, and the fiber diameter may be appropriately selected according to the type of thermoplastic resin to be used, the fineness of the nonwoven fabric composed of the hollow parallel type composite long fibers to be laminated, and the application.

The structure of the bulky laminated molded article of the present invention is appropriately selected according to the purpose of use. For example, when used as a wiping cloth, one side of a nonwoven fabric composed of hollow parallel composite long fibers having a fineness of 1 to 5 d / f has an average fiber diameter of 0.0
What laminated | stacked with the melt blown nonwoven fabric of 5d / f can be used. When used as a heat insulating material, for example, a melt-blown non-woven fabric having an average fiber diameter of 0.9 d / f is laminated and bonded to both surfaces of a non-woven fabric composed of hollow parallel composite long fibers having a fineness of 1 to 8 d / f. Can be used.

The basis weight of the bulky laminated molded article of the present invention is appropriately selected according to the purpose of use. When used for a wiping cloth or the like, the weight is preferably about 35 g / m ² ,
When used for building materials such as heat insulating materials, 50 to 20
A range of 0 g / m ² is preferred.

The nonwoven fabric comprising hollow parallel type composite filaments used in the present invention is obtained by the following method. The molten thermoplastic resin of two or more components having different melting points is supplied to a hollow parallel type composite spinning die, and a group of fibers discharged from the die is subjected to a blast cooling process substantially perpendicular to the fiber length direction.
This is drawn and drawn to the target fineness by using air soccer to obtain a long fiber group. Subsequently, the group of long fibers discharged by air soccer is spread by passing between a pair of vibrating wing-shaped objects, and the fibers are collected on an endless conveyor provided with a suction device on the back surface, and the long fibers are collected. Web. Subsequently, the long fiber web is conveyed while being placed on an endless conveyor, and a nonwoven fabric processing is performed in-line, or a nonwoven fabric processing is performed in an outline where the long fiber web is collected, to obtain a long fiber nonwoven fabric.

As the nonwoven fabric processing of the long fiber web, a low melting point component of the long fiber web is introduced between a pressure roll of a point bonding machine consisting of a heated uneven roll and a smooth roll, and the convex portion of the uneven roll is introduced. A thermocompression bonding method of obtaining a long-fiber nonwoven fabric in which the long fibers are heat-fused by melting or softening while applying pressure in the area corresponding to
A heat fusion method in which long fibers are put into hot air through air and fused by heat, besides this, may be performed by a high pressure water flow method, a needle punch method, an ultrasonic heating method, or the like. They may be combined. The basis weight of the long-fiber nonwoven fabric can be adjusted by adjusting, for example, the spinning discharge amount or the moving speed of the endless conveyor. Further, the non-woven fabric made of hollow parallel type composite long fibers constituting the bulky laminated molded article of the present invention is not limited to those manufactured by the above-described method, but the thermocompression bonding method and the heat fusion method have tensile strengths. Non-woven fabrics with excellent mechanical properties such as non-woven fabrics can be easily obtained, and when in-line, long fibers obtained by melt-spinning can be opened and accumulated as they are to obtain non-woven fabrics, which greatly increases productivity. Excellent and preferred.

As a processing method of laminating a nonwoven fabric made of a thermoplastic hollow parallel type composite long fiber and a melt blown nonwoven fabric made of a thermoplastic resin to form a bulky laminated molded article, the above-mentioned thermocompression bonding method and heat fusion method are preferably used. However, besides this, a high-pressure water flow method, a needle punch method, an ultrasonic heating method, or the like may be used, or a plurality of these nonwoven fabric methods may be combined. The melt blown nonwoven fabric can be bonded to one or both sides of the nonwoven fabric made of the long fibers.

[0021]

EXAMPLES Hereinafter, the performance of an example of a bulky laminated molded article of the present invention will be described in more detail in comparison with a comparative example. However, the present invention is not limited to only the following examples. The measuring methods of the evaluation items used in the following Examples and Comparative Examples are as follows. Melting point difference of thermoplastic resin: The test piece of non-woven fabric made of thermoplastic hollow side-by-side composite conjugate filament has a large thermal history such as thermocompression bonding and thermal fusion, and the part excluding the part where fiber shape collapse is large is excluded. The fibers were separately collected, and the fibers were measured at a heating rate of 10 ° C./min using a DSC (model: Thermal Analyst 2000) manufactured by DuPont Instruments. The melting point was determined from the melting endothermic peak of each resin.

Spinnability: Melt spinning was performed for 3 hours, and the number of occurrences of yarn breakage was measured. Considering productivity, the number of thread breaks is 3
If the number is less than or equal to the number of times, the spinnability was judged to be good. Fiber diameter: A cross section of 50 fibers was observed with a microscope, the fiber diameter of each fiber was measured, and the average value was determined. Fineness: A cross section of 50 fibers was observed with a microscope, the area of the cross section was calculated, and the fineness of each fiber was determined from this and the value of the density of the resin. The average value of these values was defined as the fineness. Wiping property: Ten monitors used the laminated molded article, actually cleaned the flooring, and added a score of 1 point per person if the feel of the skin was good together with the ability to collect dust and the like. Warmth: Ten monitors performed a sensory test based on the tactile sensation of the laminated molded product.

Bulk: Value expressed as apparent volume (cm ³ ) of nonwoven fabric / weight (g) of nonwoven fabric. The higher the value, the bulkier. Bulk recovery: Ten nonwoven fabrics are stacked, a load of 1 kg is placed on the nonwoven fabric, and left for 1 hour. Bulk settling is generated by pressing the load. Next, the load is removed, the nonwoven fabric is left to stand for 1 hour, and then the thickness of the nonwoven fabric causing bulk settling of the nonwoven fabric is measured, and this is defined as the thickness of the initial nonwoven fabric. Next, this nonwoven fabric was subjected to a heat recovery treatment with a dryer at 80 ° C. for 5 minutes, and then the thickness was measured, and this was taken as the thickness of the nonwoven fabric after the heat recovery treatment. As for the bulk recovery property, the higher the value obtained by multiplying the thickness of the nonwoven fabric after the heat recovery treatment / the thickness of the initial nonwoven fabric x 100, it may be judged that the bulk is recovered.

Example 1 One component was polypropylene and the other component was ethylene 1
1.8% by weight of an ethylene-propylene copolymer,
Using a hollow parallel composite spinneret with a volume ratio of 50:50, a resin distribution board breaker is adjusted and the fiber cross section is spun out so that the resin is arranged symmetrically with the short diameter as the axis. After cooling in air soccer, the drawing and stretching speed of the air soccer is adjusted and thinned by air soccer so that the hollow ratio of the long fiber becomes 12% and the fineness becomes 2.0 d / f. It was passed through a gap and deposited as a long fiber web on a moving endless conveyor. At this time, the moving speed of the endless conveyor was adjusted, and heat fusion was performed at 127 ° C. to obtain a long-fiber nonwoven fabric made of hollow parallel composite long fibers having a basis weight of 20 g / m ² . The melting point of the thermoplastic resin constituting this nonwoven fabric is 163 ° C. for the former and 11 for the latter, respectively.
9 ° C. Since the spinning had a hollow cross section, the cooling efficiency of the fiber by the quench was good and the spinning property was good.
On one surface of the long-fiber nonwoven fabric, a melt-blown nonwoven fabric having an average fiber diameter of 0.05 d / f made of the above-mentioned polypropylene and having a basis weight of 15 g / m ² was laminated, and was subjected to a heat-sealing process at 127 ° C. to obtain a laminated molded product. These physical properties are shown in Table 1.

[0025]

[Table 1]

Example 2 One component is polypropylene and the other component is ethylene
2% by weight of an ethylene-propylene copolymer, each of which was melted, spun at a volume ratio of 50:50 using a hollow parallel type composite spinneret in the same manner as in Example 1, cooled with a cooling device, and then cooled with air soccer. The pulling and drawing speed of the air soccer was adjusted so that the hollow fiber ratio of the long fibers was 34.6% and the fineness was 1.5 d / f, and the drawing was made thinner. to obtain a long-fiber nonwoven fabric made of hollow parallel type conjugated filaments of m ^2. The melting point of the thermoplastic resin constituting this nonwoven fabric is 163 ° C. for the former and 1 for the latter, respectively.
41 ° C. Since the spinning had a hollow cross section, the cooling efficiency of the fiber by the quench was good and the spinning property was good. A melt-blown nonwoven fabric of the above-mentioned polypropylene having a basis weight of 15 g / m ^{2 and} an average fiber diameter of 0.05 d / f was laminated on one surface of the long-fiber nonwoven fabric, and was subjected to a heat-sealing process at 148 ° C to obtain a laminated molded product. These physical properties are shown in Table 1.

Example 3 One component was polypropylene and the other component was ethylene.
1% by weight of an ethylene-propylene copolymer, each of which was melted, spun out in a volume ratio of 50:50 using a hollow parallel composite spinneret in the same manner as in Example 1, cooled by a cooling device, and then air-sucked. The draw ratio of the air soccer was adjusted so that the hollow ratio of the long fibers became 16.4% and the fineness became 1.9 d / f, and the drawing was made thinner by the same method as in Example 1. to obtain a long-fiber nonwoven fabric made of hollow parallel type conjugated filaments of m ^2. The melting point of the thermoplastic resin constituting this nonwoven fabric is 163 ° C. for the former and 13 ° C. for the latter, respectively.
2 ° C. Since the spinning had a hollow cross section, the cooling efficiency of the fiber by the quench was good and the spinning property was good.
A melt-blown nonwoven fabric of the above-mentioned polypropylene having a basis weight of 15 g / m ^{2 and} an average fiber diameter of 0.05 d / f was laminated on one surface of the long-fiber nonwoven fabric, and was subjected to a heat-sealing process at 140 ° C to obtain a laminated molded product. These physical properties are shown in Table 1.

Example 4 One component was polypropylene and the other component was ethylene 1
1.8% by weight of an ethylene-propylene copolymer,
Each was melted and spun out in the same manner as in Example 1 using a hollow parallel composite spinneret at a volume ratio of 60:40. After cooling with a cooling device, the hollow fiber hollow fiber was 12.1% in air soccer.
The drawing and drawing speed of the air soccer is adjusted so that the fineness becomes 2.0 d / f, and the drawing is made thinner. Thereafter, using the same method as in Example 1, the length of the hollow parallel type composite filament having a basis weight of 20 g / m ² is used. A fibrous nonwoven fabric was obtained. The melting point of the thermoplastic resin constituting this nonwoven fabric was measured by DSC, and the melting point was 1
63 ° C, 119 ° C. Since the spinning had a hollow cross section, the cooling efficiency of the fiber by the quench was good and the spinning property was good. On one side of this long-fiber nonwoven fabric, a basis weight of 15 g /
m ² The average fiber diameter of the polypropylene is 0.05
A melt-blown nonwoven fabric of d / f was laminated, and a heat-sealing process at 128 ° C. was performed to obtain a laminated molded body. These physical properties are shown in Table 1.

Example 5 One component was polypropylene and the other component was a linear low-density polyethylene.
At 0, spinning was performed in the same manner as in Example 1 using a hollow hollow parallel type composite spinneret, and after cooling with a cooling device, the hollow fiber was 34.6% in hollow fiber and the fineness was 1.5 d / f by air sucker. The drawing and drawing speed was adjusted by air soccer so that the drawing was made thinner, and deposited as a long fiber web on an endless conveyor using the same means as in Example 1. to obtain a long-fiber nonwoven fabric made of hollow parallel type conjugated filaments of m ^2. The melting point of the thermoplastic resin constituting this nonwoven fabric is 160 ° C. for the former and 12 ° C. for the latter, respectively.
5 ° C. Spinning has a hollow cross section, so the cooling efficiency of the fiber by quenching is good and good spinnability was shown, but the compatibility between the resins is lower than when using a copolymer, or it is slightly longer fiber. Cleavage was observed. A melt-blown non-woven fabric having an average fiber diameter of 0.05 d / f made of the above-mentioned polypropylene and having a basis weight of 15 g / m ² was laminated on one surface of the long-fiber non-woven fabric, and a heat-sealing process at 130 ° C. was performed to obtain a laminated molded body. These physical properties are shown in Table 1.

Example 6 One component was polypropylene and the other component was ethylene 1
3.2% by weight, ethylene 1-butene 1.1% by weight
A butene-propylene copolymer, each of which was melted, spun out in the same manner as in Example 1 using a hollow parallel composite spinneret with a volume ratio of 70:30, cooled with a cooling device, and then cooled with air soccer to obtain long fibers. Hollow ratio is 15.0%, fineness is 2.0d
/ F is adjusted by adjusting the drawing / drawing speed of the air soccer so as to obtain the following formula.
A long-fiber nonwoven fabric made of hollow parallel type composite long fibers of 0 g / m ² was obtained. The melting points of the thermoplastic resins constituting this nonwoven fabric were 163 ° C. for the former and 131 ° C. for the latter, respectively. Since the spinning had a hollow cross section, the cooling efficiency of the fiber by the quench was good and the spinning property was good. Further, since the compatibility between the resins was good, the fibers were not split. On one surface of the long-fiber nonwoven fabric, a melt-blown nonwoven fabric made of the polypropylene having a basis weight of 15 g / m ^{2 and having} an average fiber diameter of 0.05 d / f was laminated, and was subjected to a heat-sealing process at 137 ° C. to form a laminated molded product. These physical properties are shown in Table 1.

Example 7 One component is polypropylene and the other component is ethylene.
8.0% by weight, 5.2% by weight of 1-butene in ethylene
It is a butene-propylene copolymer, each of which is melted, spun out at a volume ratio of 50:50 using a hollow hollow parallel type composite spinneret in the same manner as in Example 1, cooled by a cooling device, and then lengthened by air soccer. The drawing / drawing speed of the air soccer is adjusted so that the hollow ratio of the fiber is 13.1%, the ratio of the major axis to the minor axis is 1.5, and the fineness is 2.0 d / f. Using the method, a long-fiber nonwoven fabric composed of hollow parallel type composite long fibers having a basis weight of 20 g / m ² was obtained. The melting point of the thermoplastic resin constituting this nonwoven fabric is 163 ° C. for the former,
The latter was at 129 ° C. The fiber was crimped, and the bulk of the nonwoven fabric was higher than that having a ratio of major axis to minor axis of 1.2. On one side of this long-fiber nonwoven fabric, a basis weight of 15 g /
m ² The average fiber diameter of the polypropylene is 0.05
A melt-blown nonwoven fabric of d / f was laminated, and was subjected to a heat-sealing process at 137 ° C. to form a laminated molded body. These physical properties are shown in Table 1.

Example 8 One component was polyethylene terephthalate and the other component was high-density polyethylene, each of which was melted and used in a hollow parallel type composite spinneret at a volume ratio of 50:50.
After spinning in the same manner as described above and cooling with a cooling device, the drawing / drawing speed of the air sucker is adjusted so that the hollow fiber hollow fiber ratio is 13.1%, the major / short diameter ratio is 1.5, and the fineness is 2.0 d / f. Then, using the same method as in Example 1, the basis weight is 20 g /
to obtain a long-fiber nonwoven fabric made of hollow parallel type conjugated filaments of m ^2. The melting points of the thermoplastic resins constituting this nonwoven fabric were 260 ° C. for the former and 129 ° C. for the latter, respectively. Since the spinning had a hollow cross section, the cooling efficiency of the fiber by the quench was good and the spinning property was good. On one surface of the long-fiber nonwoven fabric, a melt-blown nonwoven fabric made of the polypropylene having a basis weight of 15 g / m ^{2 and having} an average fiber diameter of 0.05 d / f was laminated, and was subjected to a heat-sealing process at 137 ° C. to form a laminated molded product. These physical properties are shown in Table 1.

Comparative Example 1 The same resin as in Example 1 except that the hollow ratio was 45%, the single-fiber fineness was 1.3 d / f, and a hollow concentric sheath-core type spinneret was used.
Under the processing conditions, a long-fiber nonwoven fabric composed of concentric sheath-core composite fibers having a basis weight of 20 g / m ² was obtained. The expression of crimp of the fiber was low, and further the fiber was split. On one surface of the long-fiber nonwoven fabric, a melt-blown nonwoven fabric having an average fiber diameter of 0.05 d / f made of the above-mentioned polypropylene and having a basis weight of 15 g / m ² was laminated, and was subjected to a heat-sealing process at 127 ° C. to obtain a laminated molded product.
These physical properties are shown in Table 1.

Comparative Example 2 The same resin and processing conditions as in Example 3 were used except that a hollow concentric sheath-core type spinneret was used at a volume ratio of 50:50, and the basis weight was 20 g /
to obtain a long-fiber nonwoven fabric consisting of concentric sheath-core type composite fibers of m ^2. Since the spinning had a hollow cross section, the cooling efficiency of the fibers by quenching was good, and the fibers did not fuse with each other, and showed good spinnability. However, the appearance of crimping was almost the same as that of Example 3 under the same conditions. And it was low. On one surface of the long-fiber nonwoven fabric, a melt-blown nonwoven fabric having an average fiber diameter of 0.05 d / f made of the polypropylene having a basis weight of 15 g / m ² was laminated.
A laminated molded article was obtained by heat fusion processing at a temperature of ℃. These physical properties are shown in Table 1.

Comparative Example 3 Processing was performed in the same manner as in Example 3 except that a concentric sheath-core type spinneret was used, to obtain a long-fiber nonwoven fabric made of a concentric sheath-core composite fiber having a basis weight of 20 g / m ² . No crimps were seen in the fibers. On one side of this long-fiber nonwoven fabric, a basis weight of 15 g / m ²
Average fiber diameter of 0.05 d /
The melt-blown nonwoven fabric of No. f was laminated and subjected to a heat-sealing process at 140 ° C. to obtain a laminated molded body. These physical properties are shown in Table 1.

Example 9 The same manufacturing method and thermoplastic resin as in Example 3 were used, and only one surface of a long-fiber non-woven fabric made of hollow parallel type composite long fibers having a basis weight of 285 g / m ² was coated with a basis weight of 15 g / m ² . A melt-blown nonwoven fabric having an average fiber diameter of 0.05 d / f made of polypropylene is laminated and subjected to a heat-sealing process at 140 ° C.
It was molded to produce a bulky heat insulating material. When the heat insulating property of this heat insulating material was examined by a sensory test by touch, it was evaluated as 10 points. Thereby, it turned out that heat retention was very good and it was suitable for a heat insulating material.

[0037] in the same manner as in Comparative Example 4 Comparative Example 2 The manufacturing method and a thermoplastic resin, on one side of the long-fiber nonwoven fabric made of hollow concentric sheath-core type conjugated filaments having a basis weight only 285 g / m ^2, the basis weight 15 g / m ² A melt-blown nonwoven fabric made of the above polypropylene and having an average fiber diameter of 0.05 d / f was laminated and formed by heat fusion at 140 ° C. to produce a heat insulating material. This heat insulating material was low in bulk, and the heat retention was evaluated by a sensory test based on tactile sensation. Thus, it was found that when a long-fiber nonwoven fabric made of a hollow concentric sheath-core composite long fiber was used as a heat insulating material, the heat retention performance was low.

In this embodiment, only the joining by heat fusion is described, but the same result can be obtained by thermocompression bonding.

[0039]

The bulky laminated molded article of the present invention is a molded article which hardly loses lint, solves problems such as bulkiness and bulk recovery, and also has excellent wiping properties and heat retention properties. It can be suitably used as a tool or a heat insulating material.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hollow side-by-side conjugate fiber used for a bulky laminated molded article of the present invention.

Claims (9)

[Claims] 1. A non-woven fabric (A) made of at least two-component thermoplastic resin having a melting point difference of 10 ° C. or more, and made of 1 to 8 d / f thermoplastic hollow side-by-side composite long fibers having an elliptical fiber cross-sectional shape. ) And the average fiber diameter of at least one component thermoplastic resin on at least one surface of the nonwoven fabric is 1
d / f or less melt-blown nonwoven fabric (B) is laminated, the thermoplastic hollow parallel-type composite continuous fiber has an apparent crimp, and the bulky laminated molded body is joined. A bulky laminated molded article characterized in that: 2. The thermoplastic hollow side-by-side composite long fiber,
The bulky laminated molded article according to claim 1, which is a polyolefin-based composite continuous fiber. 3. The bulky laminated molded article according to claim 2, wherein at least one of the resin components constituting the polyolefin-based composite long fiber is ethylene or a crystalline propylene copolymer containing ethylene and 1-butene. 4. The bulky laminated molded article according to claim 1, wherein a ratio of a major axis to a minor axis in a cross section of the thermoplastic hollow side-by-side composite long fiber is 1.1 to 1.6. 5. The ratio of the cross-sectional area of the hollow portion to the cross-sectional area surrounded by the outer peripheral portion (hollow ratio) is 10 to 40%.
A bulky laminated molded article according to any one of the above. 6. The bulky laminated molded article according to claim 1, wherein the fiber intersection is joined to the bulky laminated molded article by thermocompression bonding. 7. The bulky laminated molded article according to claim 1, wherein the fiber intersection is joined to the bulky laminated molded article by heat fusion. 8. A wiper using at least a part of the bulky laminated molded article according to claim 1. 9. A heat insulating material using at least a part of the bulky laminated molded article according to claim 1.