JP2000328348A - Splittable type conjugate fiber and formed fiber product using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain splittable type conjugated fibers comprising a thermoplastic resin and excellent in splittability, a dense formed fiber product good in formation using the conjugated fibers and a laminated formed fiber product comprising a sheet laminated onto the formed fiber product. SOLUTION: The splittable type conjugated fibers are composed of at least two components of thermoplastic resins and obtained by making the respective components alternately adjacent in the major axis direction, have a bent, a curved or a flat cross-sectional shape and satisfy the relationship of 3-20 ratio (L/W) of the major axis L to the minor axis W of the cross section. The formed fiber product uses the splittable type conjugated fibers and the laminated formed fiber product comprises a sheet laminated onto the formed fiber product.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a splittable conjugate fiber having excellent splittability. More specifically, a splittable composite fiber having excellent splitting properties that can be suitably used in the field of industrial materials such as battery separators, wipers, and filters, diapers, sanitary materials such as napkins, and clothing. The present invention relates to a fiber molded article and a laminated fiber molded article using the same.

[0002]

2. Description of the Related Art Conventionally, sea-island type or split type composite fibers have been known as a method for obtaining ultrafine fibers. In the method using sea-island composite fibers, a plurality of components are combined and spun into sea-island composite fibers, and one component of the obtained composite fibers is dissolved and removed to obtain ultrafine fibers. Although this method can obtain very fine fibers, it is uneconomical to dissolve and remove one component. On the other hand, the method of using the splittable conjugate fiber is a method of combining and spinning a plurality of component resins to form a conjugate fiber, and using the obtained conjugate fiber by utilizing a physical stress or a difference in shrinkage of the resin against a chemical agent. An ultrafine fiber is obtained by dividing the splittable conjugate fiber into a number of fibers.

[0003] For example, a split-type composite fiber typified by a combination of a polyester resin and a polyolefin resin, a combination of a polyester resin and a polyamide resin, and a combination of a polyamide resin and a polyolefin resin is made ultrafine and fine.
When processing into a nonwoven fabric or the like, the splitting and thinning process such as high-pressure liquid flow treatment is the rate-determining step of the nonwoven fabric forming process. In addition, there is a problem that the energy cost required for dividing into fine fibers is large.

[0004] On the other hand, in the case of a combination of similar resins such as polyolefin resins, polyester resins, polyamide resins, etc., the above-mentioned problems are further increased because the compatibility of the resins is relatively better than that of the different polymers. In order to increase the size and to make the fibers finer, it is necessary to further increase the physical impact. For this reason, the obtained nonwoven fabric is
There are so-called irregularities, such as the presence of divided and undivided parts, the movement of fibers by physical impact, and the formation of thicker and thinner parts. There were problems such as a need to significantly reduce the processing speed.

To solve this problem, Japanese Patent Laid-Open No.
No. 8922 discloses that by adding an organosiloxane and a modified product thereof to a resin, it is possible to easily divide even a splittable conjugate fiber composed of a combination of polymers of the same kind. However, although the splittability is somewhat improved, the nonwoven fabric obtained by using the split fibers has problems such as reduced strength and poor workability in secondary processing.

[0006]

SUMMARY OF THE INVENTION The present inventors have conducted intensive studies in order to solve the problems of the prior art.
As a result, in the fiber cross-section, each component is alternately adjacent to each other in the longitudinal direction, and the cross-section is a conjugate fiber having a bent, curved or flat shape, and The ratio of the major axis L to the minor axis W (L /
By making the splittable conjugate fiber satisfying W) 3 to 20, the splittable conjugate fiber can be easily split, and when the splittable conjugate fiber is used, a dense and well-formed fiber molded article and laminated fiber molding are obtained. They found that a body could be obtained and completed the present invention based on this finding. As is apparent from the above description, the object of the present invention is to provide a splittable conjugate fiber having excellent splitting properties without adding any additives for improving splitting properties, even in the case of a combination of similar resins. An object of the present invention is to provide a dense and well-formed fiber molded product and a product using the molded product.

[0007]

The present invention comprises the following. (1) It is composed of at least two components of a thermoplastic resin,
In the fiber cross section, each component is alternately adjacent to each other in the long axis direction, and the cross section is a bent, curved or flat composite fiber, and the ratio of the long axis L to the short axis W (L / W) of the cross section Is from 3 to 20.

(2) In the fiber cross section of the splittable conjugate fiber, the ratio (a / b) of the fiber outer peripheral surface length a of one component constituting the fiber to the contact length b between adjacent components is 0.1 to 2.5. 2. The splittable conjugate fiber according to the above item 1, wherein

(3) In the fiber cross section of the splittable conjugate fiber, the ratio (S1 / S2) of the area S1 surrounded by the bend or curve to the cross-sectional area S2 of the splittable conjugate fiber is 0.2 to 0.2.
3. The splittable conjugate fiber according to any one of the above items 1 or 2, which is 1.0.

(4) The thermoplastic resin of at least two components constituting the fiber after fiber molding has a melt flow rate of 10 to 100 g / 10 min, and has the highest melting point among the thermoplastic resins. The ratio (MFR-A / MFR-) of the melt flow rate (MFR-A) of the resin component (hereinafter, referred to as A component) and the melt flow rate (MFR-B) of the resin component having the lowest melting point (hereinafter, referred to as B component). B)
4. The splittable conjugate fiber according to any one of the above items 1 to 3, wherein is 0.1 to 5.

(5) The splittable conjugate fiber according to any one of (1) to (4) above, wherein the combination of at least two thermoplastic resins is a combination of a polypropylene resin and a polyethylene resin.

(6) The single fiber fineness of the conjugate fiber before splitting is 0.5 to 10 dtex, and the single fiber fineness after splitting is 0.5
6. The splittable conjugate fiber according to any one of the above items 1 to 5, which is not more than decitex.

(7) A fiber molding containing at least 30% by weight or more of the splittable conjugate fiber according to any one of the above items 1 to 6, and wherein at least 50% of the splittable conjugate fiber is split. body.

(8) The fiber molded article according to the above item 7, wherein the fiber molded article is a fiber aggregate.

(9) The fiber molded article according to any one of the above items 7 or 8, wherein the fiber molded article is a fiber aggregate obtained by a spun bond method.

(10) Any one of the above items 7 to 9
A laminated fiber molded product obtained by laminating a sheet on one side or both surfaces of the fiber molded product according to the above item.

(11) Any one of the above items 7 to 9
A laminated fiber molded product obtained by laminating the fiber molded product according to the above item on both sides of a sheet.

(12) The laminated fiber molded article according to any one of the above (10) or (11), wherein the sheet is a sheet selected from at least one of a nonwoven fabric, a film, a knit, and a woven fabric.

(13) Any one of the above items 7 to 9
13. An absorbent article using the fiber molded article according to the above item or the laminated fiber molded article according to any one of the above items 10 to 12.

(14) Any one of the above-mentioned items 7 to 9
Item 13. A wiper using the fiber molded product according to Item 10 or the laminated fiber molded product according to any one of Items 10 to 12.

(15) Any one of the above items 7 to 9
13. A battery separator using the fiber molded article according to the above item or the laminated fiber molded article according to any one of the above items 10 to 12.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The thermoplastic resin used for the splittable conjugate fiber of the present invention is not particularly limited as long as it has fiber formability in the melt spinning step.For example, polyester resins, polyamide resins, polyolefin resins, and the like are preferably used. Resin.

Examples of the polyester resin include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid and 2,6-naphthalenedicarboxylic acid, and aliphatic dicarboxylic acids such as adipic acid and sebacic acid, and esters thereof as an acid component. And a homopolymer polyester or a copolymer polyester synthesized from diol compounds such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol, and 1,4-cyclohexanedimethanol as alcohol components. Paraoxybenzoic acid, 5
And those in which sodium sulfoisophthalic acid, polyalkylene glycol, pentaerythritol and the like are added or copolymerized.

As the polyamide polymer, 6,6-nylon, 6,10-nylon, 6-nylon, 1,1-nylon
Nylon, 1,2-nylon, 4-nylon, 4,6-
Nylon and copolymers containing these as a main component can be exemplified.

On the other hand, as polyolefin resins, aliphatic α-olefins having 2 to 8 carbon atoms, for example, ethylene, propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 3-methyl-1 -Homopolymers such as butene, 1-hexene, 1-octene and the like;
-Copolymers of two or more olefins, said α-olefins and other olefins and / or small amounts of other ethylenically unsaturated monomers such as butadiene, isoprene, pentadiene-1, styrene, α-methylstyrene and the like. Copolymers with saturated monomers and mixtures of two or more thereof can be mentioned.

Representative examples include polypropylene resins and polyethylene resins. Examples of the polypropylene resins include propylene homopolymer, propylene containing 70% by weight or more of propylene, and the above-mentioned α- A copolymer with one or more olefins,
For example, an ethylene-propylene copolymer, an ethylene-propylene-butene copolymer and the like can be mentioned.

As the polyethylene resin, high-density polyethylene (HDPE) and low-density polyethylene (L
DPE), linear low density polyethylene (L-LDPE)
And the like.

The melt flow rate of the polypropylene resin (230 ° C., 2.18 N, hereinafter referred to as MFR) and the MFR of the polyethylene resin (190 ° C., 2.18 N)
N) is not particularly limited as long as it can be spun, but is preferably 1 to 100 g / 10 min, more preferably 5 to 70 g / 10 min in any resin.

As the thermoplastic resin other than the above, for example, a vinyl polymer is used, and specifically, polyvinyl alcohol, polyvinyl acetate, polyacrylate,
Ethylene vinyl acetate copolymer, syndiotactic polystyrene or a copolymer thereof can also be used.

The splittable conjugate fiber of the present invention can be arbitrarily combined with at least two components of the above-mentioned thermoplastic resin.
For example, a combination mainly composed of a polyester resin and a polyamide resin is preferable. In the industrial materials and sanitary materials fields where chemical resistance, light weight and low cost are required, a combination mainly composed of a polyolefin resin having high chemical resistance and being advantageous in terms of cost can be exemplified. In a field where properties are required, a combination of a polypropylene resin and a polyethylene resin is preferable.

Here, any combination of the above-mentioned thermoplastic resins is possible. For example, a combination of exactly the same resin such as a combination of a polyethylene terephthalate resin and a polyethylene terephthalate resin, a combination of a polypropylene resin and a polypropylene resin, and the same composition ratio Are excluded from the scope of the present invention.

In the combination of the two components of the polypropylene resin and the polyethylene resin which are suitably used for the splittable conjugate fiber of the present invention, the polypropylene resin is the high melting point resin (component A). Specific examples of such a polypropylene-based resin include syndiotactic polypropylene and isotactic polypropylene polymerized with a Ziegler-Natta catalyst, a metallocene catalyst, and the like. The MFR-A of the polypropylene resin which is a high melting point resin may be in a range in which melt spinning is possible, and by changing spinning conditions and the like, the MFR-A after fiber molding is in a range of 10 to 100 g / 10 minutes. If there is no problem. MFR-A after fiber molding
Is more preferably 10 to 70 g / 10 min. When the MFR-A after fiber molding is less than 10 g / 10 minutes or more than 100 g / 10 minutes, it is difficult to spin into fine fibers with good spinnability.

The polyethylene resin is a low melting point resin (component B) lower than the melting point of the polypropylene resin, and specific examples include high density polyethylene, linear low density polyethylene, and low density polyethylene. be able to. Further, a mixture of two or more of these polyethylenes may be used. MF of polyethylene resin as raw material
RB may be in a range in which melt spinning is possible, and MFR-B after fiber molding may be 10 to 100 g / d by changing spinning conditions and the like.
There is no particular problem within the range of 10 minutes. MFR-B after fiber molding is more preferably 10 to 60 g / 10 minutes. MFR-B is less than 1 g / 10 min or 100
If it exceeds g / 10 minutes, it is difficult to spin into fine fibers with good spinnability.

When the resin having the highest melting point among the at least two thermoplastic resins constituting the splittable conjugate fiber of the present invention is the A component, the MFR of the A component is MFR-A, and the MFR-A is the lowest. When the MFR of the B component when the resin is the B component is MFR-B, the ratio (MFF) of the MFR
(RA / MFR-B) is preferably from 0.1 to 5, more preferably from 0.5 to 3. If this value is less than 0.1 or more than 5, the flowability of these components in the spinneret during melt spinning, the difference in melt tension after being discharged in a bent, curved, or flat shape, during cooling It is difficult to maintain the spinnability due to factors such as an increase in the difference in viscosity increase between the fibers.

The thermoplastic resin used in the present invention further includes an antioxidant, a light stabilizer, an ultraviolet absorber, a neutralizing agent, a nucleating agent, an epoxy stabilizer, as long as the effects of the present invention are not impaired. Additives such as a lubricant, an antibacterial agent, a flame retardant, an antistatic material, a pigment, a plasticizer, and a hydrophilic agent may be appropriately added as needed.

Next, the fiber cross section of the splittable conjugate fiber of the present invention will be described. The splittable conjugate fiber of the present invention is composed of, for example, at least two-component thermoplastic resin as exemplified in FIG. 1, and in the fiber cross section, each component is alternately adjacent to each other in the longitudinal direction, and the cross section is It is a conjugate fiber having a bent, curved or flattened shape, wherein the ratio (L / W) of the major axis L to the minor axis W of the cross section (L / W) is 3 to 20. Here, the major axis L represents the length of the longest portion of the cross-sectional shape in the direction in which the components are alternately adjacent to each other (see FIG. 1). The minor axis W indicates the direction of the contact surface of each component, that is, the thickness of the cross-sectional shape (see FIG. 1). When the L / W ratio is 3 or more, the surface area is large when the number of divided segments and the fineness are the same as compared with ordinary circular section splittable conjugate fibers, for example, radial and laminated splittable conjugate fibers, and Since the contact area between adjacent components is small, a high-pressure liquid flow can be effectively received by the conjugate fiber, and division is easy even at the same water pressure. In addition, when it exceeds 20, the composite fiber can receive the high-pressure liquid flow effectively, but problems such as maintaining spinnability, reducing the number of holes per unit area of the die, and reducing productivity occur. I do.

Further, since the cross-sectional shape is a bent, curved or flat shape, the division is further improved. In the case where the undrawn yarn obtained in the spinning step is drawn in the drawing step, for example, in the drawing step, as compared with the one in which the fiber cross-sectional shape is a straight line (see FIG. 9), the fibers bundled between rolls having a speed difference Is stretched by a strong stress, but at this time, the fibers are compressed with a high pressure. When short fibers are used, the fibers are compressed by a strong pressure equal to or higher than that in the drawing step in the cutting step. For this reason, the splittable conjugate fiber of the present invention having a bent or curved fiber cross section,
Compared to a straight cross-sectional shape, it is very easily crushed, that is, the division is partially advanced. Even without splitting, strain is applied to the contact interface of each component of the conjugate fiber, so that the conjugate fiber is more easily split, and the splittable conjugate fiber of the present invention is very easily split.

As described above, in the case where the division has already partially progressed in the yarn making process, the papermaking method can be suitably used.
In the case of the papermaking method, it is preferred that the division has already been partially performed, since a dense and well-formed web is obtained at the papermaking stage.
Also, if you want to minimize the progress of splitting during the spinning process,
It is effective to set a low draw ratio. Specifically, the drawn yarn elongation preferably has 20% or more of the undrawn yarn elongation. Here, the bent or curved cross-sectional shape is not particularly limited.
5), S-shaped (see FIG. 7), M-shaped, N-shaped, L
Examples include a V-shape, a V-shape, a W-shape (see FIG. 8), and a corrugation, but the present invention is not limited to these cross-sectional shapes. Further, a mixture of various cross-sectional shapes may be used. Further, as the flat shape, for example, U
Molds, horseshoe-shaped, U-shaped, and horseshoe-shaped curved portions may be compressed and flattened in cross section, but the present invention is not limited to these cross sections.

As described above, since the cross-sectional shape of the splittable conjugate fiber of the present invention is bent, curved or flat in the major axis direction, the same effect as in the drawing and cutting steps can be obtained by adding calender rolls. It can also be done by pressure.
Therefore, even when long fibers in an undrawn yarn state such as a spunbond method are directly accumulated on a conveyor, by passing between pressurized calender rolls, a divided, finely divided fiber aggregate Can be a body. Also, compared to the fiber cross section of the splittable conjugate fiber employed in the conventional spunbonding method, the splittable conjugate fiber of the present invention is composed of ultrafine fibers having more uniform fineness because each segment has almost the same fineness. Fiber molded article.

Further, the ratio (a / b) of the length a of the fiber outer peripheral arc of one component of the resin constituting the splittable conjugate fiber of the present invention to the contact length b with the adjacent component is 0.1 to 2 .5 is preferably satisfied. When the (a / b) ratio is less than 0.1, the contact area with the adjacent component becomes larger than the outer peripheral surface of the fiber, and the structure becomes a laminate of flakes. Required. On the other hand, if it exceeds 2.5, the number of divisions becomes small, or the thickness of the flat shape becomes too thin, so that it becomes very difficult to produce with good spinnability.

Further, in the fiber cross section of the splittable conjugate fiber of the present invention, the ratio (S1 / S1) of the area S1 surrounded by the bend or curve and the cross sectional area S2 (see FIG. 6) of the splittable conjugate fiber is shown.
2) preferably satisfies 0.2 to 1.0. Here, S1 represents a portion surrounded by a straight line connecting both ends of the long axis and a bend or curve in the fiber cross section of the splittable conjugate fiber of the present invention, and represents a degree of the bend or curve. That is, as S1 increases, the major axis is greatly bent or curved, and S1 / S2 preferably satisfies 0.2 or more. If it is less than 0.2, the bending or bending is small, and the effect of the bending or bending is reduced.
On the other hand, if it exceeds 1.0, it becomes difficult to maintain the productivity due to the problem that the long axis of the conjugate fiber becomes too long or the thickness becomes extremely thin.

The splittable conjugate fiber of the present invention adopts the above-mentioned fiber cross-sectional shape, so that it is extremely difficult to split with the conventional splittable conjugate fiber and high energy is required for splitting. Even in the case of a combination of resins, particularly a combination of polyolefin-based resins, it is excellent in division property and can be easily divided. Further, even a web composed of short fibers used in a papermaking method can be divided at a high division ratio with good formation. From the above, the splittable conjugate fiber of the present invention can be preferably used for a combination of resins which has been considered difficult to split. Here, the spinneret used to obtain the fiber cross section of the splittable conjugate fiber of the present invention is not particularly limited as long as the split conjugate fiber can be obtained, for example,
The pores are C type, S type, M type, N type, L type, V type,
Caps arranged in a W shape, a corrugated shape, a U shape, a horseshoe shape, or the like can be used.

In the splittable conjugate fiber of the present invention, the conjugate ratio of the conjugate fiber composed of at least two-component thermoplastic resin is in the range of 10/90 to 90/10% by weight. Is preferably 100% by weight, more preferably 30/70 to 70/30% by weight, and most preferably 40/60 to 60/40. By setting the compounding ratio in such a range, a cross-sectional shape in which at least two kinds of thermoplastic resins are uniformly arranged is obtained, and a more uniform fiber molded body can be obtained.

When the splittable conjugate fiber obtained in the present invention is split by high-pressure liquid flow treatment or the like, the average fineness of the ultrafine fiber after splitting is preferably 0.5 dtex or less, particularly preferably 0.3 dtex or less. . Therefore, the number of divided segments of the splittable conjugate fiber may be determined so that the average fineness of the ultrafine fibers is 0.5 decitex or less, and the larger the number of divided segments, the smaller the fineness after splitting. Is preferably 4 to 32 segments in terms of ease of fiber production.

The fineness of the single yarn before splitting is not particularly limited, but is preferably 0.5 to 10.0 dtex, and more preferably 1.0 to 6.0 dtex. The fineness of each segment does not need to be the same, and when the splittable conjugate fiber is not completely split, a plurality of different finenesses are set between the undivided split fiber and the completely split ultrafine fiber. May be mixed.

Hereinafter, as an example of the splittable conjugate fiber of the present invention, a polypropylene resin and a high-density polyethylene resin are used.
An example of a method for producing a split conjugate fiber in which components are combined will be described. A long fiber made of the resin is spun using a normal melt spinning machine. Spinning temperature is 200 ~ 330 ℃
And the take-up speed is 40
m / min to 1500 m / min. Stretching may be performed as needed, and in the case of performing stretching, the stretching ratio is usually preferably about 3 to 9 times. Further, the obtained tow is cut into a predetermined length to obtain short fibers. The above description discloses the process for producing short fibers, but it is also possible to form a long fiber tow into a web using a fiber separation guide or the like without cutting the tow. Thereafter, the fiber is formed into a fiber molded body through a high-order processing step as required, depending on various uses. Further, after spinning and drawing, the fiber molded body is wound up as a filament yarn or the like, knitted or woven to form a knitted woven fabric, or the short fiber is formed into a spun yarn, and then knitted or woven to form a knitted woven fabric. May be formed.

That is, here, the fiber molded body may be any fiber-shaped form, such as a woven fabric, a knitted fabric,
Non-woven fabrics or non-woven fiber aggregates are exemplified. In addition, those in the form of a cloth by a method such as cotton blending, blending, blending, twisting, knitting, and blending are also included. Further, the nonwoven fiber aggregate refers to a web-like material made uniform by a method such as a card method, an air laid method, or a papermaking method.

In this step, after spinning the fiber, a surfactant can be adhered to the fiber surface for the purpose of preventing static electricity of the fiber and imparting smoothness for improving the processability of the fiber molded article. The type and concentration of the surfactant are appropriately adjusted according to the application. As a method of attachment, a roller method, a dipping method, a pad dry method, or the like can be used. The attachment may be performed in any of the spinning step, the stretching step, and the crimping step. Further, regardless of whether the fibers are short fibers or long fibers, a surfactant can be attached to the fiber molded body other than the spinning step, the stretching step, and the crimping step, for example, after molding the molded article.

The fiber length of the splittable conjugate fiber of the present invention is not particularly limited, but when a web is formed using a carding machine, a fiber length of 20 to 76 mm is generally used.
In the paper making method and the air laid method, the fiber length is generally 2 mm to 2 mm.
The one with 0 mm is preferably used. If the fiber length is less than 2 mm, the fiber will move due to physical impact, and the fiber itself will not easily receive the energy required for division. If the fiber length is significantly larger than 76 mm, the web cannot be formed uniformly by a carding machine or the like, and it is difficult to form a web having a uniform formation.

As an example of the method for producing a fibrous formed article made of the splittable conjugate fiber of the present invention, a method for producing a nonwoven fabric will be described. For example, using the short fibers produced by the above-mentioned splittable composite fiber production method, a web having a required basis weight is produced by a card method, an air laid method, or a papermaking method. Alternatively, a web may be directly produced by a melt blown method, a spun bond method, or the like. The web produced by the above method can be divided and finely divided by a known method such as a needle punch method, a high-pressure liquid flow treatment, or a pressurized calender roll to obtain a fiber molded body. Further, the fiber molded body can be treated by a known processing method such as hot air or a hot roll. When a web composed of very short fibers such as a papermaking method is divided into fine fibers by a known method such as a needle punch method or a high-pressure liquid flow treatment, the fibers are divided and moved at the same time by the physical stress. Since the formation may be defective, fibers that are heat-fused at a melting point lower than the melting point of the resin constituting the splittable conjugate fiber of the present invention are mixed in advance by 5 to 30% by weight. By performing heat treatment at a temperature at which the non-woven fabric is fused to prepare a heat-sealed non-woven fabric, formation defects can be suppressed.

The basis weight of the fiber molded article of the present invention is not particularly limited, but is preferably 10 to ²⁰⁰ g / m ² . If the basis weight is less than 10 g / m ² , if the splittable conjugate fiber is divided and finely divided by a physical stress such as a high-pressure liquid flow treatment to produce the nonwoven fabric, a nonwoven fabric with poor formation may be obtained. When the basis weight exceeds 200 g / m ² ,
The basis weight is high, a high-pressure water flow is required, and it may be difficult to perform uniform and uniform division.

The fiber molded article of the present invention can be used by mixing other fibers with the splittable conjugate fiber of the present invention, if necessary, as long as it does not hinder the present invention. Examples of such other fibers include synthetic fibers such as polyamide, polyester, polyolefin, and acrylic; natural fibers such as cotton, wool, and hemp; regenerated fibers such as rayon, cupra, and acetate; and semi-synthetic fibers.

Next, the high-pressure liquid flow processing will be described.
As the high-pressure liquid flow device used for the high-pressure liquid flow treatment, for example, a hole diameter of 0.05 to 1.5 mm, particularly 0.1 to 0.5
A device in which a large number of injection holes having a diameter of 0.1 mm to 1.5 mm are arranged in a single row or in a plurality of rows is used. A high-pressure liquid stream obtained by jetting at a high water pressure from an injection hole is caused to collide with the web placed on a porous support member. Thereby, the undivided splittable conjugate fiber of the present invention is entangled and fined at the same time by the high-pressure liquid flow. The arrangement of the injection holes is arranged in a row in a direction orthogonal to the traveling direction of the web. As the high-pressure liquid flow, room temperature or hot water may be used, and other liquids may be optionally used.

The distance between the injection hole and the web is 10 to 1
It is good to be 50 mm. If this distance is less than 10 mm, the formation of the fiber molded body obtained by this treatment is disturbed,
On the other hand, if the distance exceeds 150 mm, the physical impact of the liquid stream on the web becomes weak, and confounding and fine splitting may not be performed sufficiently. The processing pressure of the high-pressure liquid flow is controlled by the manufacturing method and the required performance of the fiber molded body, but is generally 20 kg / cm ^{2 to} 200 kg.
/ Cm ² of the high-pressure liquid stream is preferably injected. Although it depends on the basis weight of the treatment, etc., within the range of the treatment pressure, when the high-pressure liquid flow is treated by sequentially increasing the pressure from a low water pressure to a high water pressure, the formation of the web is not disturbed, It becomes possible to divide the fine fibers. As a porous support member on which a web is placed when applying a high-pressure liquid flow, for example, 50 to 2
There is no particular limitation as long as the high-pressure liquid flow penetrates the web, such as a 00 mesh wire mesh or a synthetic resin mesh screen or a perforated plate.

After applying the high-pressure liquid flow treatment from one side of the web, the entangled web is subsequently inverted,
By performing the high-pressure liquid flow treatment, it is possible to obtain a fiber molded body that is dense on both sides and has good formation. After the high-pressure liquid flow treatment, moisture is removed from the treated fiber molded body. In removing the moisture, a known method can be employed. For example, after removing water to some extent using a squeezing device such as a mangrol, the water can be completely removed using a drying device such as a hot air circulation type dryer to obtain the fiber molded article of the present invention.

When the web containing the splittable conjugate fiber of the present invention is subjected to a high-pressure liquid flow treatment by the above-mentioned method and divided into fine fibers to obtain a dense fiber molded product, the conventional splittable conjugate fiber having a fiber cross section ( 9 and 10), it is easier to divide,
Less physical impact due to high pressure liquid flow. For this reason, the formation is improved by speeding up the high-pressure liquid flow processing, which is the rate-determining step of the nonwoven fabric processing step, and reducing the pressure of the high-pressure liquid flow. For example, the pressure of the high-pressure liquid flow can be reduced. And the problem that a through hole is opened can be improved.

As described above, even a splittable conjugate fiber composed of the same type of resin, which is considered to be most difficult to split, can be easily split, and a dense and well-formed fiber molded body can be obtained. The fiber molded article can be suitably used in the field of industrial materials such as battery separators and wipers, as well as in the field of sanitary materials and clothing.

Further, a laminated fiber molded article (hereinafter referred to as A type) comprising a sheet of at least one selected from nonwoven fabrics, films, knits, and woven fabrics laminated on one or both sides of the fiber molded article of the present invention; Can be a laminated fiber molded body (hereinafter referred to as B type) in which the fiber molded body is reversely laminated on both sides of the sheet. In the case of the A type, it is preferable to laminate the fiber molded body subjected to the division treatment on one side or both sides of the sheet because the division efficiency is good. In the case of the B type, the fibrous molded body is divided before and after lamination, but the dividing treatment after lamination is particularly preferable because the entanglement action between the sheet and the fibrous molded body can be obtained. Any of these laminated fiber molded articles (A) and (B) can be suitably used in the field of sanitary materials represented by absorbent articles such as diapers and napkins, and in the field of industrial materials such as wipers and battery separators. .

[0059]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The terms used in the examples and comparative examples and methods for measuring physical properties are as follows.

(1) Melt flow rate: JIS K7
210. Raw material polypropylene resin: Condition 14 Raw material polyethylene resin: Condition 4 Polyolefin resin after fiber molding: Condition 14

(2) L / W Measurement Method The following values were calculated from cross-sectional photographs of 10 randomly selected undivided fibers, and the L / W was calculated from the average value. L: The direction in which each component is alternately adjacent, and represents the longest part of the fiber cross-sectional shape (see FIG. 1) W: The contact surface direction of each component, that is, the thickness of the cross-sectional shape (see FIG. 1)

(3) a / b Measurement Method The following values were calculated from cross-sectional photographs of 10 randomly selected undivided fibers, and a / b was calculated from the average value. a: average value of the length of the fiber outer peripheral surface of one component (see FIG. 1) b: average value of the contact length of one component (see FIG. 1)

(4) S1 / S2 measurement method From the fiber cross-sectional photograph of 10 randomly selected undivided fibers,
1, the area of S2 was calculated, and S1 / S2 was calculated from the average value. (See FIG. 6) S1: Area of a portion surrounded by a straight line connecting both ends of the long axis and a bend or curve S2: Cross-sectional area of splittable conjugate fiber of the present invention

(5) Spinnability The spinnability at the time of melt spinning was evaluated by the following three steps based on the occurrence rate of the number of yarn breaks. ：: No breakage of yarn occurred and operability was good. Δ: Thread breaks occur 1 to 2 times per hour ×: Thread breaks occur 4 times or more per hour, causing operational problems.

(6) Stretching ratio Calculated by the following equation. Stretching ratio = take-up roll speed (m / min) / supply roll (m
/ Min)

(7) Tensile strength and tensile strength of fiber Measured according to JIS-L1013 method using an Autograph AGS500D manufactured by Shimadzu Corporation at a yarn length of 100 mm and a tensile speed of 100 mm / min.

(8) Tensile strength and elongation of non-woven fabric A non-woven fabric having a width of 5 cm was obtained from an autograph manufactured by Shimadzu Corporation.
The breaking strength of the nonwoven fabric in the MD direction was measured using AGS500D. Measurement was performed at a test length of 100 mm and a tensile speed of 200 mm / min, and the measurement temperature was room temperature.

(9) Measurement of splitting ratio The nonwoven fabric after splitting is included in wax, and sliced at right angles to the fiber axis with a microtome to prepare a data piece. This is observed with a microscope, the cross-sectional image of the fiber is image-processed, and the total cross-sectional area (A) of the fiber in which 70% or more of the segment is divided and the total cross-sectional area (B) of the undivided fiber are measured. Was calculated by the following equation. Division ratio (%) = {A / (A + B)} × 100

(10) Single yarn fineness after division From the fineness before division and the number of segments that can be divided, the single yarn fineness after division and fineness was calculated by the following formula. Fineness after division (dtex / f) = Fineness before division (dtex /
f) / Dividable segment number (pieces)

(11) Formation A panel of 10 panelists made a nonwoven fabric (1 m
The evaluation was made as follows based on the result of visually observing the distribution unevenness of the fibers of (corner). ：: Seven or more felt that there were few spots and no through holes. B: Four to six persons felt that there were few spots and no through holes. X: Three or less felt that there was little unevenness.

(12) High-pressure liquid flow treatment A web made by a roller card machine, an air laid machine, a paper machine, or the like is placed on a conveyor belt of 80 mesh plain weave, and the conveyor belt speed is 20 m / min.
A high-pressure liquid flow was ejected by passing immediately below a nozzle having a nozzle diameter of 0.1 mm and a nozzle pitch of 1 mm. First, after a preliminary treatment (2 stages) at 2 MPa, a 4-stage treatment was performed with a high-pressure liquid flow at a water pressure of 5 MPa. Turn the web over and press 5M
By performing a four-stage treatment with a high-pressure liquid flow of Pa, a divided and finely divided nonwoven fabric was obtained. Here, the stage refers to the number of times that the ink has passed just below the nozzle.

(13) Pressurized (split) roll Induction heat-generating hydraulic two-roll clearance machine (manufactured by Yuri Roll Co., Ltd.) Processing temperature: Atmospheric temperature Processing linear pressure: 40 kg / cm Processing speed: 10 m / min

(14) Water resistance Pressure was measured in accordance with JIS L1092.

Examples 1 to 3 Using a polypropylene resin (propylene homopolymer) as the high melting point resin (component A), a high density polyethylene resin as the low melting point resin (component B), and using a splittable composite fiber die, The volume ratio of both resins of the component A and the component B is 50/50.
Then, a splittable conjugate fiber having a fiber cross-sectional shape shown in FIG. 1 and having a single yarn denier of 7.5 dtex was spun. In the take-off step, the alkyl phosphate potassium salt was deposited. The obtained unstretched yarn was stretched at 90 ° C. and 4.1 times, and after attaching a papermaking finishing agent, it was cut into 10 mm,
Short fibers having a water content of 20% by weight were obtained. 20% by weight of a sheath-core composite fiber of polypropylene (core) / low-density polyethylene (sheath) (EAC fiber, Chisso Corporation) was added to the short fiber, and a square sheet machine (25 cm × 25 cm) was used.
The web was made by the papermaking method. Using a Yankee dryer manufactured by Kumagai Riki Kogyo Co., Ltd., it was dried at 105 ° C. for 3 minutes and preliminarily bonded to obtain a web. After performing the high-pressure liquid flow treatment on the web, the web was further dried with a dryer at 80 ° C. to obtain a fiber molded body.

Example 4 A polypropylene resin (propylene homopolymer) was used as the high melting point resin (component A), a high density polyethylene resin was used as the low melting point resin (component B), and a split type composite fiber die was used. And the volume ratio of both resins of the component B is 50/5
The value was set to 0, and a splittable conjugate fiber having a single yarn denier of 7.5 dtex and having a fiber cross-sectional shape shown in FIG. 2 was spun. In the take-off step, the alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 1.5 times, crimped, and cut into 51 mm. The obtained short fibers were formed into a web by a roller card machine, and the web was subjected to the high-pressure liquid flow treatment, and then dried with a dryer at 80 ° C. to obtain a fiber molded body. When the fiber molded article was used as a surface material of an adult diaper, it was excellent in feel (soft feeling), strong strength of a nonwoven fabric, and the like, and was very good as an absorbent article.

Example 5 Spinning of a splittable conjugate fiber and production of a fiber molded body in accordance with Example 1 except that a splittable conjugate fiber base for obtaining a fiber cross section shown in FIG. 3 was used. Was done.

Example 6 A split type composite fiber was spun and a fiber molded product was produced in accordance with Example 1, except that a linear low-density polyethylene was used instead of the high-density polyethylene.

Example 7 A split type composite fiber was spun and a fiber molded body was produced in accordance with Example 1, except that low-density polyethylene was used instead of high-density polyethylene.

Example 8 Using a polypropylene resin (propylene homopolymer) as the high melting point resin (component A) and a high density polyethylene resin as the low melting point resin (component B), using a die for splittable conjugate fiber, component A And the volume ratio of both resins of the component B is 50/5
The value was set to 0, and a splittable conjugate fiber having a fiber cross-sectional shape shown in FIG. 1 having a single yarn denier of 20.0 dtex was spun. In the take-off step, the alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 4.1 times to attach a papermaking finish, and then cut into 10 mm to obtain a short fiber having a water content of 20% by weight. A sheath-core composite fiber (EAC fiber, Chisso Corporation) of polypropylene (core) / low-density polyethylene (sheath) is added to the short fiber in an amount of 20% by weight.
It was added to form a web by a papermaking method using a square sheet machine (25 cm × 25 cm). Using a Yankee dryer manufactured by Kumagai Riki Kogyo Co., Ltd., it was dried at 105 ° C. for 3 minutes and preliminarily bonded to obtain a web. After performing the high-pressure liquid flow treatment on the web, the web was further dried with a dryer at 80 ° C. to obtain a fiber molded body.

Example 9 Spinning of a splittable conjugate fiber and production of a fiber molded product were performed in the same manner as in Example 8 except that a splittable conjugate fiber base for obtaining a fiber cross section shown in FIG. 2 was used. Fabrication was performed.

The spinning / drawing conditions, fiber properties, shape, nonwoven fabric properties, division ratio, etc. of Examples 1 to 9 are shown in Table 1 below.

Example 10 PET (K101, manufactured by Kanebo KK) having a relative viscosity of 0.60 (measured at 20 ° C. using a mixture of phenol and ethane tetrachloride as a solvent) was mixed with a high melting point resin (component A). ) And polypropylene resin (MF) as the low melting point resin (component B).
R: 16 g / 10 min propylene homopolymer)
14. Using a splittable composite fiber base, the volume ratio of both the A component and the B component resins is set to 50/50, and single yarn denier is used.
A split type composite fiber having a fiber cross-sectional shape of 0 dtex and shown in FIG. 1 was spun. In the take-off step, the alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 3.3 times, and after attaching a papermaking finishing agent, cut into 10 mm to obtain short fibers having a water content of 20% by weight. 20% by weight of a sheath-core composite fiber of polypropylene (core) / low-density polyethylene (sheath) (EAC fiber, Chisso Corporation) was added to this short fiber, and a square sheet machine (2
(5 cm × 25 cm) and a web was formed by a papermaking method. Using a Yankee dryer manufactured by Kumagai Riki Kogyo Co., Ltd., it was dried at 105 ° C. for 3 minutes and preliminarily bonded to obtain a web. After performing the high-pressure liquid flow treatment, the mixture was further dried with a dryer at 80 ° C. to obtain a fiber molded body.

Example 11 Spinning of a splittable conjugate fiber and production of a fiber molded body were performed in the same manner as in Example 1 except that a splittable conjugate fiber base for obtaining a fiber cross section shown in FIG. 4 was used. Was.

Example 12 Using a polypropylene resin (propylene homopolymer) as the high melting point resin (component A) and a high density polyethylene resin as the low melting point resin (component B), using a die for splittable conjugate fiber, component A And the volume ratio of both resins of the component B is 50/5
The value was set to 0, and a splittable conjugate fiber having a single yarn denier of 7.5 dtex and having a fiber cross-sectional shape shown in FIG. 1 was spun. In the take-off step, the alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 4.1 times, and after attaching a papermaking finish, it was cut into 10 mm to obtain short fibers having a water content of 20% by weight. 20% by weight of a sheath-core composite fiber (EAC fiber, Chisso Corporation) of polypropylene (core) / low-density polyethylene (sheath) was added to the short fiber, and a papermaking method was performed using a square sheet machine (25 cm × 25 cm). And made it web. The Web was dried at 105 ° C. for 3 minutes using a Yankee dryer manufactured by Kumagai Riki Kogyo Co., Ltd.
Preliminary bonding was performed to obtain a web. After performing the high-pressure liquid flow treatment on the web, the web was further dried with a dryer at 80 ° C. to obtain a fiber molded body.

Example 13 Using a polypropylene resin (propylene homopolymer) as the high melting point resin (component A), a high density polyethylene resin as the low melting point resin (component B), and a split type composite fiber base, And the volume ratio of both resins of component B is 50/50.
A splittable conjugate fiber having a fiber cross-sectional shape shown in FIG. 1 was spun by a spun bond method. The composite fiber group discharged from the spinneret is introduced into air soccer and drawn and stretched.
After obtaining a composite filament having a single yarn denier of 2.0 dtex, the same group of filaments discharged from the air soccer was charged with the same electric charge by a charging device, and then collided with a reflecting plate to spread the fiber. Then, the opened filament group is collected as a filament web on an endless net-shaped conveyor provided with a suction device on the back surface. After splitting the long fiber web with a pressure roll, the web was processed with an embossing roll machine heated to 120 ° C. and having an area ratio of 15% to obtain a fiber molded body.

The spinning / drawing conditions, fiber properties, shape, nonwoven fabric properties, division ratio, etc. of Examples 10 to 13 are shown in Table 2 below.

Comparative Examples 1 and 2 A polypropylene resin (propylene homopolymer) was used as the high melting point resin (component A), a high density polyethylene resin was used as the low melting point resin (component B), and a split type composite fiber die was used. The volume ratio of both resins of component A and component B is 50/5
The value was set to 0, and a splittable conjugate fiber having a single yarn denier of 7.5 dtex and having a fiber cross-sectional shape shown in FIG. 1 was spun. In the take-off step, the alkyl phosphate potassium salt was deposited. The obtained undrawn yarn was drawn at 90 ° C. and 4.1 times, and after attaching a papermaking finish, it was cut into 10 mm to obtain short fibers having a water content of 20% by weight. 20% by weight of a sheath-core composite fiber (EAC fiber, Chisso Corporation) of polypropylene (core) / low-density polyethylene (sheath) was added to the short fiber, and a papermaking method was performed using a square sheet machine (25 cm × 25 cm). And made it web. This was dried at 105 ° C. for 3 minutes using a Yankee dryer manufactured by Kumagai Riki Kogyo Co., Ltd., and preliminarily bonded to obtain a web. After performing the high-pressure liquid flow treatment on the web, the web was further dried with a dryer at 80 ° C. to obtain a fiber molded body. Spinning / drawing conditions, fiber properties, shape,
The physical properties of the nonwoven fabric, the division ratio, and the like are shown in Table 2 below.

Comparative Example 3 Spinning of a splittable conjugate fiber and production of a fiber molded body were carried out in the same manner as in Example 1 except that a die for a splittable conjugate fiber for obtaining a fiber cross section shown in FIG. 9 was used. went. The spinning / drawing conditions, fiber properties, shape, nonwoven fabric properties, division ratio and the like are shown in Table 2 below.

Comparative Example 4 Spinning of a splittable conjugate fiber and production of a fiber molded body were carried out in the same manner as in Example 1, except that a die for a splittable conjugate fiber for obtaining a fiber cross section shown in FIG. 10 was used. went. The spinning / drawing conditions, fiber properties, shape, nonwoven fabric properties, division ratio and the like are shown in Table 2 below.

Comparative Example 5 Spinning of a splittable conjugate fiber and production of a fiber molded body were carried out in the same manner as in Example 13 except that a die for a splittable conjugate fiber for obtaining a fiber cross section shown in FIG. 10 was used. went. The spinning / drawing conditions, fiber properties, shape, nonwoven fabric properties, division ratio and the like are shown in Table 2 below.

Examples 14 and 15 According to Example 1, a web (abbreviated as A) having a basis weight of 10 g / m ^{2 in} a pre-process (before high-pressure liquid flow treatment) for obtaining a fiber molded body was obtained. Next, sheath-core type composite fiber of high-density polyethylene (sheath) / polypropylene (core) (ESC fiber, Chisso Corporation)
Using short fibers of 2.2 dtex x 51 mm, the basis weight is 10 g /
An m ² card web (abbreviated as B) was obtained. A is the upper layer, B
Are laminated on the lower layer (Example 14) and A is the upper and lower layers,
After laminating B in the middle layer (Example 15), each was subjected to the high-pressure liquid flow treatment, and dried with a dryer at 80 ° C. to obtain a laminated fiber molded body. Further, when this laminated fiber molded product was used for a wiper for wiping, Example 14 was repeated.
And No. 15 exhibited very excellent wiping properties.

Example 16 Using a polypropylene resin (propylene homopolymer) as the high-melting resin (component A), a high-density polyethylene resin as the low-melting resin (component B), And the volume ratio of both resins of the component B is 50/5
The split conjugate fiber having a fiber cross-sectional shape shown in FIG. 1 and having a single denier of 2.0 dtex was spun by a spun bond method to obtain a web having a basis weight of 10 g / m ² for the middle layer. Next, in the combination of the resins, the volume ratio of both the A and B resins is set to 50/50 by using the core for the sheath-core type composite fiber, the component A as the core side, and the component B as the sheath side. A composite fiber having a denier of 2.0 dtex is spun by a spun bond method, and a web having a basis weight of 5.0 g / m ² is laminated as an upper and lower layer on the above-mentioned intermediate layer web.
This was treated with an embossing machine heated to 20 ° C. and having an area ratio of 15% to obtain a laminated fiber molded body. Further, when the fiber molded article was used as a surface material of an adult diaper, it was excellent in water pressure resistance, nonwoven fabric strength, etc., and was very good as an absorbent article.

[0093]

[Table 1]

[0094]

[Table 2]

As is clear from Tables 1 and 2, the fiber molded product and the laminated fiber molded product obtained in each example of the present invention were divided at a higher division ratio under the same conditions as in the comparative examples. ing. That is, even without performing the high-pressure liquid flow treatment of the conventional high water pressure, because the division, fineness easily proceeds, even a relatively low-weight nonwoven fabric can be produced without disturbing formation, Furthermore, the cost of high pressure liquid flow processing can be significantly reduced.

[0096]

The splittable conjugate fiber of the present invention is very easy to split, so that it is easy to make ultrafine fibers without increasing the physical impact without adding any additives for easy splitting. Can be done. Therefore, when the split conjugate fiber of the present invention is used, a dense and well-formed fiber molded product and a laminated fiber molded product can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view of a fiber cross section of a splittable conjugate fiber used in the present invention.

FIG. 2 is a schematic view of a fiber cross section of a splittable conjugate fiber used in the present invention.

FIG. 3 is a schematic diagram of a cross section of a fiber of a splittable conjugate fiber used in the present invention.

FIG. 4 is a schematic view of a fiber cross section of a splittable conjugate fiber used in the present invention.

FIG. 5 is a schematic view of a cross section of a fiber of a splittable conjugate fiber used in the present invention.

FIG. 6 is an area surrounded by a bend or a curve (S1).
And schematic diagram showing the cross-sectional area (S2) of the splittable conjugate fiber

FIG. 7 is a schematic diagram of a cross section of a fiber of a splittable conjugate fiber used in the present invention.

FIG. 8 is a schematic view of a fiber cross section of a splittable conjugate fiber used in the present invention.

FIG. 9 is a schematic view of a fiber cross section of a splittable conjugate fiber used in a comparative example.

FIG. 10 is a schematic diagram of a fiber cross section of a splittable conjugate fiber used in a comparative example.

[Explanation of symbols]

L: The length of the longest part of the cross-sectional shape in the direction in which the components of the composite fiber are alternately adjacent to each other. W: The thickness of the cross-sectional shape in the contact surface direction of each component of the conjugate fiber. a: The length of the outer peripheral surface of one component fiber constituting the composite fiber. b: Represents the contact length of one component constituting the conjugate fiber with an adjacent component. S1: represents the area of a portion surrounded by a straight line connecting both ends of the long axis and bending or bending. S2: represents the fiber cross-sectional area of the composite fiber.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) D04H 1/56 D04H 1/56 F term (reference) 4L041 AA07 AA19 AA20 BA04 BA05 BA11 BA33 BA48 BA49 BA59 BD06 BD07 BD11 BD20 CA06 CA37 CA38 DD01 DD06 DD14 EE06 EE20 4L045 AA05 BA03 BA06 BA21 BA34 BA39 BA54 BA60 DA42 4L047 AA14 AA27 AB02 AB08 AB09 BA04 BA09 BA21 BA22 BB09 CC01 CC03 CC04 CC05 CC12 CC16

Claims (15)

[Claims] 1. A composite fiber comprising at least two components of a thermoplastic resin, wherein, in a fiber cross section, each component is alternately adjacent to each other in a longitudinal direction, and the cross section is a bent, curved or flat composite fiber. The ratio (L /
W) is 3 to 20; 2. In the fiber cross section of the splittable conjugate fiber, the ratio (a / b) of the fiber outer peripheral surface length a of one component constituting the fiber to the contact length b of the adjacent component is 0.1 to 2.5. The splittable conjugate fiber according to claim 1. 3. A ratio (S1 / S2) of an area S1 surrounded by a bend or a curve to a cross-sectional area S2 of the splittable conjugate fiber in the cross section of the splittable conjugate fiber is 0.2 to 1.0. The splittable conjugate fiber according to claim 1. 4. A resin having a highest melting point among the thermoplastic resins having a melt flow rate of at least 10 to 100 g / 10 minutes for each of the thermoplastic resins of at least two components constituting the fibers after fiber molding. Component (hereinafter referred to as A component)
The ratio (MFR-A / MFR-B) of the melt flow rate (MFR-A) of the resin component having the lowest melting point (MFR-B) to the resin component having the lowest melting point (hereinafter referred to as B component) is 0.
The splittable conjugate fiber according to any one of claims 1 to 3, which is 1 to 5. 5. The splittable conjugate fiber according to claim 1, wherein the combination of at least two thermoplastic resins is a polypropylene resin and a polyethylene resin. 6. The split conjugate fiber has a single fiber fineness before splitting of 0.1.
The splittable conjugate fiber according to any one of claims 1 to 5, wherein the single yarn fineness after splitting is 5 decitex or less and 0.5 dentex or less. 7. A fibrous article comprising at least 30% by weight or more of the splittable conjugate fiber according to claim 1, and 50% or more of the splittable conjugate fiber is split. 8. The fiber molding according to claim 7, wherein the fiber molding is a fiber aggregate. 9. The fiber molded article according to claim 7, wherein the fiber molded article is a fiber aggregate obtained by a spun bond method. 10. A laminated fiber molded product obtained by laminating a sheet on one or both surfaces of the fiber molded product according to any one of claims 7 to 9. 11. A laminated fiber molded product obtained by laminating the fiber molded product according to any one of claims 7 to 9 on both sides of a sheet. 12. The sheet according to claim 10, wherein the sheet is a sheet selected from at least one of a nonwoven fabric, a film, a knitted fabric, and a woven fabric.
Alternatively, the laminated fiber molded product according to claim 11. 13. An absorbent article using the fiber molded article according to any one of claims 7 to 9 or the laminated fiber molded article according to any one of claims 10 to 12. 14. A wiper using the fiber molded article according to any one of claims 7 to 9 or the laminated fiber molded article according to any one of claims 10 to 12. 15. A battery separator using the fiber molded article according to any one of claims 7 to 9 or the laminated fiber molded article according to any one of claims 10 to 12.