JP2010126849A - Fiber for staple fiber nonwoven fabric, method for producing the fiber, staple fiber nonwoven fabric, method for producing the fabric, and daily commodity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber for a staple fiber nonwoven fabric, effective for suppressing generation of static charge in production of the nonwoven fabric without lowering performance of chitosan and giving little stimulation to the skin, and to provide a method for producing the fiber, the staple fiber nonwoven fabric, a method for producing the nonwoven fabric, and daily commodities. <P>SOLUTION: The fiber 1 for the staple fiber nonwoven fabric is produced by attaching respective prescribed amounts of at least a polyethylene glycol fatty acid ester 3, which is an ester of a polyethylene glycol having a molecular weight of 400-800 and a fatty acid having a carbon number of 10-20 and a chitosan surfactant 4, to the surface of a fiber body 2 consisting of a sheath-core conjugate fiber wherein the core part 2a is formed of polypropylene or polyethylene terephthalate and the sheath part 2b is formed of polyethylene. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fiber for a short fiber nonwoven fabric and a method for producing the same, a short fiber nonwoven fabric using the fiber, a method for producing the same, and a household product. More specifically, the present invention relates to a technique for producing a functional nonwoven fabric having antibacterial properties and hydrophilic properties.

  Conventionally, the nonwoven fabric which provided functions, such as antibacterial property, antifungal property, and hygroscopic property, by attaching chitosan to the surface is proposed (for example, refer to patent documents 1-4). In the conventional functional nonwoven fabric as described in these Patent Documents 1 to 4, generally, after forming a nonwoven fabric by heat-sealing short fibers made of a resin plastic resin or the like, a liquid containing chitosan is sprayed or By applying, chitosan is adhered to the fiber surface.

  Moreover, the method of manufacturing a nonwoven fabric using the fiber which made chitosan adhere is also proposed (for example, refer patent document 5). Patent Document 5 discloses an antibacterial synthetic fiber in which a yarn is heat-drawn and crimped, and then a chitosan salt and a modified polyether ester having a molecular weight of 1000 to 100,000 are attached to the surface of the obtained fiber. Is disclosed. In the technique described in Patent Document 5, heat treatment is performed under a temperature condition of 100 to 200 ° C. in order to fix the chitosan and the modified polyether ester to the fiber surface.

JP-A-4-272273 (Japanese Patent No. 2944236) JP 2002-142856 A JP 2003-166155 A JP 2004-131622 A JP-A-11-117177

  However, the conventional techniques described above have the following problems. That is, as in the techniques described in Patent Documents 1 to 4, the method of attaching chitosan after forming a nonwoven fabric has a problem that chitosan is likely to fall off and the effect cannot be maintained for a long time. Moreover, since such a nonwoven fabric tends to become hard, when it is used for the part which touches skin, there exists a possibility that the rough skin by a physical irritation may arise.

  On the other hand, the fiber described in Patent Document 5 has a problem in that the effect of chitosan is not sufficiently exhibited because a modified polyether ester for preventing static electricity in the carding process is attached to the surface. Moreover, when the nonwoven fabric produced using this fiber is used for the part which touches skin, irritation | stimulation of modified polyetherester may cause a rash. On the other hand, when only chitosan is attached to the fiber surface without using an oil agent such as a modified polyether ester, there is a problem that static electricity is generated in the card process and a uniform nonwoven fabric cannot be obtained.

  Therefore, the present invention can suppress the generation of static electricity during the production of the nonwoven fabric without degrading the performance of chitosan, and further, the fiber for short fiber nonwoven fabric and the method for producing the same, the short fiber nonwoven fabric and Its main purpose is to provide its manufacturing method and daily necessities.

The fiber for a short fiber nonwoven fabric according to the present invention is a polyethylene glycol fatty acid ester which is an ester of at least a polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms on the surface of a fiber main body whose surface layer is made of polyethylene, and , Chitosan surfactant is attached.
In the present invention, the generation of static electricity in the card process during the production of the nonwoven fabric is suppressed by the polyethylene glycol fatty acid ester adhering to the surface of the fiber body. In addition, since this polyethylene glycol fatty acid ester penetrates into the fiber body due to heating during heat fusion, the fiber surface after heat fusion has excellent antibacterial and hydrophilic properties and has little irritation to the skin. It will be coated with the active agent.
In this fiber, a core-sheath type composite fiber in which the core part is formed of polypropylene or polyethylene terephthalate and the sheath part is formed of polyethylene may be used as the fiber body.
In that case, the sheath is preferably high-density polyethylene.
The chitosan surfactant is obtained by acylating a part of chitosan with a long-chain fatty acid or an anhydride thereof, for example.
Furthermore, in this fiber for short fiber nonwoven fabric, the adhesion amount of the said polyethylene glycol fatty acid ester shall be 0.2-0.5 mass%, and the adhesion amount of the said chitosan surfactant shall be 0.1-1.0 mass%. be able to.

In the method for producing a fiber for a short fiber nonwoven fabric according to the present invention, a polyethylene whose surface layer is an ester of at least a polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms on the surface of a fiber main body made of high density polyethylene After attaching the glycol fatty acid ester and the chitosan surfactant, it has a drying heat treatment step of heating at a temperature of 90 to 110 ° C.
In this invention, since the surface layer of a fiber main body is formed with the high density polyethylene, it is heated at the temperature of about 135-145 degreeC at the time of nonwoven fabric manufacture. By this heating, the polyethylene glycol fatty acid ester adhered to the fiber body surface is taken into the fiber body and hardly remains on the fiber surface after the nonwoven fabric is formed. Moreover, since the fiber main body surface is covered with chitosan surfactant by this, the short fiber nonwoven fabric manufactured becomes hydrophilic and also antibacterial property is provided.
In the method for producing a fiber for a short fiber nonwoven fabric, the amount of the polyethylene glycol fatty acid ester after the drying heat treatment step is 0.2 to 0.5% by mass, and the amount of the chitosan surfactant is 0.1 to 1%. It is good also as 0.0 mass%.
Moreover, as the fiber body, a core-sheath type composite fiber in which a core part is formed of polypropylene or polyethylene terephthalate and a sheath part is formed of high-density polyethylene can be used.
Furthermore, as the chitosan surfactant, one obtained by acylating a part of chitosan with a long-chain fatty acid or an anhydride thereof can be used.

The short fiber nonwoven fabric according to the present invention is obtained by heat-sealing the above-mentioned fiber for short fiber nonwoven fabric, and the adhesion amount of polyethylene glycol fatty acid ester on the fiber surface is 40% or less of the adhesion amount before heat fusion. is there.
In the present invention, since the amount of polyethylene glycol fatty acid ester attached is greatly reduced by heat fusion, there is little irritation to the skin, and it is excellent in antibacterial and hydrophilic properties. Further, since the polyethylene glycol fatty acid ester is sufficiently adhered before heat fusion, the suppression of static electricity generation in the card process is suppressed, and uneven formation is not caused.

In the method for producing a short fiber nonwoven fabric according to the present invention, a polyethylene glycol fatty acid ester which is an ester of a polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms on the surface of a fiber main body made of polyethylene, and It has the process of heat-seal | bonding the nonwoven fabric fiber to which chitosan surfactant adheres.
In the present invention, since the adhesion amount of polyethylene glycol fatty acid ester is reduced by heat fusion, a nonwoven fabric having excellent antibacterial and hydrophilic properties and less irritation to the skin can be obtained while suppressing the generation of static electricity in the card process.
Moreover, the said polyethyleneglycol fatty acid ester adhesion amount in the fiber surface for nonwoven fabrics before heat sealing is 0.2-0.5 mass%, for example, The said polyethyleneglycol fatty acid ester adhesion amount in the fiber surface for nonwoven fabrics after heat sealing | fusion Is 40% or less of the adhesion amount before heat fusion.
Furthermore, a core-sheath type composite fiber having a core part made of polypropylene or polyethylene terephthalate and a sheath part made of polyethylene can be used for the fiber body.
In that case, it is desirable that the sheath portion of the core-sheath composite fiber is formed of high-density polyethylene.
Furthermore, as the chitosan surfactant, one obtained by acylating a part of chitosan with a long-chain fatty acid or an anhydride thereof can be used.

The daily necessities according to the present invention use the above-mentioned short fiber nonwoven fabric, and examples thereof include a mask, a simple body warmer, a paper diaper, a sanitary napkin, and a panty liner.
In the present invention, since a short fiber nonwoven fabric having a fiber surface coated with a chitosan surfactant is used, the antibacterial property and hydrophilicity are excellent, and there is little irritation to the skin.

  According to the present invention, the generation of static electricity can be suppressed by the polyethylene glycol fatty acid ester adhering to the surface of the fiber body when passing through the card machine, and the polyethylene glycol fatty acid ester is taken into the fiber body after heat fusion. Since the fiber surface is mainly coated with the chitosan surfactant, the skin irritation can be reduced and excellent antibacterial and hydrophilic properties can be obtained.

  The best mode for carrying out the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments described below. First, the fiber for a short fiber nonwoven fabric according to the first embodiment of the present invention will be described.

  FIG. 1 is a cross-sectional view schematically showing a configuration of a fiber for a short fiber nonwoven fabric of the present embodiment. FIG. 1A shows a cross section including a central axis and perpendicular to the axial direction, and FIG. A cross section including an axis and parallel to the axial direction is shown. 2 is a cross-sectional view schematically showing a state after heat-sealing the short fiber nonwoven fabric fiber shown in FIG. 1, and FIG. 2 (a) shows a cross section including the central axis and perpendicular to the axial direction. FIG. 2B shows a cross section including the central axis and parallel to the axial direction. As shown in FIGS. 1A and 1B, in the fiber 1 for a short fiber nonwoven fabric of the present embodiment, a polyethylene glycol fatty acid ester 3 and a chitosan surfactant 4 are attached to the surface of the fiber body 2. .

  The fiber main body 2 in the fiber 1 for short fiber nonwoven fabrics only needs to have a surface layer formed of polyethylene. For example, the periphery of the core 2a made of polypropylene or polyethylene terephthalate as shown in FIGS. 1 (a) and (b). In addition, a core-sheath type composite fiber in which a sheath 2b made of polyethylene is formed can be used. In that case, not only the concentric type in which the sheath part 2b as shown in FIGS. 1 (a) and 1 (b) is arranged at the center of the fiber cross section but also an eccentric type in which the sheath part 2b is displaced from the center may be used. Moreover, the cross-sectional shape of the sheath 2b is not limited to a circle, and may be an irregular shape. Furthermore, when the fiber main body 2 is a core-sheath type composite fiber, it is preferable that the polyethylene which comprises the sheath part 2b is a high density polyethylene.

  The polyethylene glycol fatty acid ester 3 attached to the fiber body 2 is an ester of polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms. When the molecular weight of the polyethylene glycol constituting the polyethylene glycol fatty acid ester 3 is less than 400, it becomes difficult to dissolve in water, which may cause a problem in the production process. Further, when polyethylene glycol having a molecular weight exceeding 800 is used, the insulation resistance increases, and the effect of preventing the generation of static electricity in the card process is reduced.

  On the other hand, it is desirable that the fatty acid component constituting the polyethylene glycol fatty acid ester 3 has a total carbon number of 10 to 20 in order to obtain a higher effect. Moreover, this fatty acid may be either saturated or unsaturated, and may be either linear or branched. Examples of such fatty acids include decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, and oleic acid. Furthermore, the form of the ester may be either a monoester or a diester, but in order to obtain a higher effect, the monoester is preferable.

  In addition, in the fiber 1 for short fiber nonwoven fabrics of this embodiment, you may make 2 or more types of polyethyleneglycol fatty acid ester 3 adhere to the surface of the fiber main body 2. FIG. Moreover, other well-known oil agent can also be made to adhere with the polyethylene glycol fatty acid ester 3 mentioned above in the range which does not impair the scope of the present invention.

  The adhesion amount of the polyethylene glycol fatty acid ester 3 is desirably 0.2 to 0.5% by mass with respect to the total mass of the fiber. When the adhesion amount of the polyethylene glycol fatty acid ester 3 is less than 0.2% by mass, a sufficient static electricity suppressing effect may not be obtained, and when the adhesion amount exceeds 0.5% by mass, the fiber surface becomes sticky. Occurring, the coefficient of friction of the fiber may increase, and the card passing property may decrease.

  On the other hand, the chitosan surfactant 4 has a surface active function in addition to the original function of chitosan, and is superior in antibacterial properties and hydrophilicity compared to conventional chitosan. Examples of such chitosan surfactant 4 include those obtained by acylating a part of chitosan with a long-chain fatty acid or an anhydride thereof.

  Moreover, as for the adhesion amount of chitosan surfactant 4, it is desirable that it is 0.1-1.0 mass% with respect to the fiber total mass. If the adhesion amount of the chitosan surfactant 4 is less than 0.1% by mass, sufficient antibacterial properties may not be obtained. May cause contamination.

  In addition, in the fiber 1 for a short fiber nonwoven fabric of this embodiment, in addition to the polyethylene glycol fatty acid ester 3 and the chitosan surfactant 4 described above, a water repellency imparting agent and an oil repellency imparting agent are further added to the surface of the fiber body 2. Further, a deodorant imparting agent and a naturally derived extractant may be adhered.

  Next, the manufacturing method of the fiber for short fiber nonwoven fabrics of this embodiment is demonstrated. For example, when manufacturing the fiber 1 for a short fiber nonwoven fabric shown in FIGS. 1 (a) and 1 (b), first, a core sheath having, for example, high density polyethylene as a component of the sheath portion 2b and polyethylene as a component of the core portion 2a. A mold composite fiber is melt-spun. And after the extending | stretching process of the thread | yarn, a crimp is provided and the fiber main body 2 is obtained.

  Next, a predetermined amount of polyethylene glycol fatty acid ester 3 and chitosan surfactant 4 are adhered to the surface of the fiber body 2. Examples of the method include an impregnation method, a transfer method, and a spray method.

  Thereafter, the fiber body 2 to which the polyethylene glycol fatty acid ester 3 and the chitosan surfactant 4 are attached is heat-dried at a temperature of 90 to 100 ° C. to obtain a fiber 1 for a short fiber nonwoven fabric. Here, when the heating temperature is less than 90 ° C., a solvent such as water cannot be removed, and the fiber becomes wet. On the other hand, when the heating temperature exceeds 110 ° C., heat shrinkage occurs in the fiber body 2 and changes in crimp occur.

  As described above, in the short fiber nonwoven fabric fiber 1 of this embodiment, the polyethylene glycol fatty acid ester 3 attached to the surface of the fiber body 2 is an ester of polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms. Therefore, the generation of static electricity in the card process during the production of the nonwoven fabric can be suppressed. Moreover, since chitosan surfactant 4 provided with a hydrophilic group is made to adhere to the surface of the fiber main body 2, while providing antimicrobial property, the surface can be hydrophilized.

  Furthermore, as shown to Fig.2 (a) and (b), in the fiber 1 for nonwoven fabrics of this embodiment, when the fiber is heat-seal | fused, the polyethyleneglycol fatty acid ester 3 is taken in in the melted polyethylene. This is because the polyethylene glycol fatty acid ester 3 adhering to the surface of the fiber main body 2 has a low molecular weight and a molecular structure similar to that of the polyethylene constituting the surface layer of the fiber main body 2, so both have high affinity. This is because when the polyethylene is melted by heat, a force to mix them works. Since such an action does not work between the chitosan surfactant 4 and the polyethylene, the chitosan surfactant 4 remains as it is, and the fiber surface after heat fusion is coated with the chitosan surfactant 4. As a result, the nonwoven fabric manufactured by the nonwoven fabric fiber 1 of the present embodiment has higher antibacterial properties than conventional nonwoven fabrics, and can further significantly reduce the burden on the skin.

  Next, the short fiber nonwoven fabric according to the second embodiment of the present invention will be described. The short fiber nonwoven fabric of this embodiment is obtained by thermally fusing the fiber 1 for short fiber nonwoven fabric of the first embodiment described above, and the amount of polyethylene glycol fatty acid ester 3 attached to the surface of each fiber is heat fused. It is 40% or less of the previous adhesion amount.

  In this way, by using an oil agent (polyethylene glycol fatty acid ester 3) that reduces the amount of adhesion on the fiber surface by thermal fusion, it reduces the irritation to the skin while maintaining the static electricity suppressing effect during production. Is possible. In addition, when the adhesion amount of polyethylene glycol fatty acid ester 3 after heat fusion is larger than 40% of the adhesion amount before heat fusion, the residual amount of polyethylene glycol fatty acid ester 3 on the fiber surface increases, resulting in chitosan surface activity. The effect of the agent 4 may be reduced or the skin may be burdened.

  Next, the manufacturing method of the short fiber nonwoven fabric of this embodiment is demonstrated. When manufacturing the short fiber nonwoven fabric of this embodiment, first, the staple fiber which consists of the fiber 1 for short fiber nonwoven fabric of 1st Embodiment mentioned above is opened with a card machine, and is made into a sheet. At that time, since the fiber surface is made hydrophilic by the polyethylene glycol fatty acid ester 3, the generation of static electricity is suppressed. Thereafter, the fibers are thermally fused to obtain a nonwoven fabric by hot air fusion, hot roller fusion (including emboss roller fusion), or the like. Since the polyethylene glycol fatty acid ester 3 is taken into the polyethylene constituting the surface layer of the fiber main body 2 by this heat-sealing step, it hardly remains on the fiber surface of the obtained nonwoven fabric.

  As described above, since the short fiber nonwoven fabric of this embodiment uses fibers for a short fiber nonwoven fabric in which a predetermined amount of polyethylene glycol fatty acid ester is attached to the surface of the fiber body, it can suppress the generation of static electricity in the card process. it can. Moreover, since the adhesion amount of this polyethylene glycol fatty acid ester is greatly reduced by heat fusion, the stimulating surfactant hardly adheres to the fiber surface after heat fusion. Furthermore, since the chitosan surfactant adheres to the fiber surface after heat sealing, a short fiber nonwoven fabric excellent in hydrophilicity and antibacterial properties can be obtained. Furthermore, since the short fiber nonwoven fabric of this embodiment can be manufactured by a conventional process, it is not necessary to introduce new equipment.

  Thus, since the short fiber nonwoven fabric of this embodiment has little irritation | stimulation to skin, it can be used also for the part which touches skin directly. In particular, it is suitable for various masks such as a moisturizing mask and daily necessities such as simple warmers, various hygiene products such as paper diapers, sanitary napkins and panty liners.

  Hereinafter, the effects of the present invention will be described with reference to examples and comparative examples of the present invention. First, as an example of the present invention, a monoester of polyethylene glycol and oleic acid having a molecular weight of 600 is formed on the surface of a core-sheath type composite fiber having a core part made of polypropylene and a sheath part made of high-density polyethylene. Examples 1 to 6 were prepared by attaching (oil agent A) or a monoester (oil agent B) of polyethylene glycol having a molecular weight of 400 and oleic acid (oil agent B) and Excel Chitosan (chitosan surfactant) manufactured by Natural Materials Science Institute. A fiber for a short fiber nonwoven fabric was prepared.

  Further, as a comparative example of the present invention, an alkyl phosphate potassium salt having an alkyl chain of 8 carbon atoms on the surface of a core-sheath type composite fiber having a core part made of polypropylene and a sheath part made of high-density polyethylene ( Oil C) and Excel Chitosan manufactured by Natural Materials Research Institute were attached to produce a fiber for short fiber nonwoven fabric of Comparative Example 1. Furthermore, as a comparative example 2, the surface of the core-sheath type composite fiber in which the oil agent is not used, the core part is made of polypropylene, and the sheath part is made of high-density polyethylene, A fiber for a short-fiber nonwoven fabric to which only was attached was produced.

  Next, each fiber of Examples and Comparative Examples was heat-sealed to prepare a short fiber nonwoven fabric. And the adhesion amount of the oil agent and chitosan surfactant on the fiber surface after heating, card | curd permeability, and the hydrophilic property of the nonwoven fabric were evaluated. At that time, the adhesion amount of each component was determined by using a rapid residual oil extraction device (R-II type manufactured by Tokai Keiki Co., Ltd.) with a solvent in which ethyl alcohol and methyl alcohol were mixed at a mass ratio of 2: 1 to 2 g of the sample. Based on the amount of extraction when 10 ml was used twice and extracted at room temperature for about 15 minutes, it was obtained by the following formula 1.

  Moreover, each card | curd of the Example and the comparative example passed through the sample roller card | curd in the atmosphere of 20 degreeC and 70% RH, and the card | curd passage property observed visually the degree of generation | occurrence | production of the static electricity and powder | flour at the time of web discharge | emission. As a result, when there is no generation of static electricity or powder, ○, when slight generation of static electricity or powder is seen, △, when static electricity is generated and the texture is disturbed, and a large amount of powder is generated under or around the card The case where it did is made x. Furthermore, the hydrophilicity of the nonwoven fabric was evaluated by dropping 10 drops of water on the produced nonwoven fabric and the number of absorbed water drops. The above results are summarized in Table 1 below.

  As shown in Table 1 above, the fibers of Examples 1 to 6 produced within the scope of the present invention were excellent in card passage and hydrophilicity. Particularly, an example in which the adhesion amount of polyethylene glycol fatty acid ester is in the range of 0.2 to 0.5% by mass and the adhesion amount of chitosan surfactant is in the range of 0.1 to 1.0% by mass. 1 to 3 fibers were excellent in both card passing properties and hydrophilic properties of the nonwoven fabric.

  Furthermore, the non-woven fabric manufactured from the fibers of Examples 1 to 3 having excellent characteristics was wetted with water and applied to the inside of the arms of 10 subjects for 8 hours, and the skin irritation was confirmed. However, there was no occurrence of rash. Therefore, when the antibacterial property was evaluated for the nonwoven fabric produced from the fibers of Examples 1 and 2, the nonwoven fabric produced from the fiber of Example 1 has a bacteriostatic activity value of S. aureus and E. coli of 4. Example 2 The nonwoven fabric produced from the fibers had a bacteriostatic activity value of S. aureus and E. coli of 4.4, and both exhibited excellent antibacterial properties.

  On the other hand, the fiber of Comparative Example 1 using an oil agent other than polyethylene glycol fatty acid ester was equivalent to the fiber of the above-described example with respect to card passing property and hydrophilicity, but confirmed irritation to the skin. As a result, discoloration of the skin was seen in nine people. This is considered to be because the performance of the chitosan surfactant was not sufficiently exhibited because the oil agent remained on the fiber surface. On the other hand, the fiber of the comparative example 2 which does not use an oil agent was inferior in card | curd permeability, and generation | occurrence | production of static electricity and generation | occurrence | production of powder were seen.

  From the above results, it was confirmed that according to the present invention, fibers for a short fiber nonwoven fabric that are excellent in card passing property, antibacterial property and hydrophilicity, and also less irritating to the skin can be obtained.

It is sectional drawing which shows typically the structure of the fiber for short fiber nonwoven fabrics concerning the 1st Embodiment of this invention, (a) shows a cross section perpendicular | vertical to an axial direction including a central axis, (b) is a central axis. And shows a cross section parallel to the axial direction. It is sectional drawing which shows typically the state after heat-seal | fusing the fiber for short fiber nonwoven fabrics shown in FIG. 1, (a) shows a cross section including a central axis and perpendicular | vertical to an axial direction, (b) is a central axis. And shows a cross section parallel to the axial direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber for short fiber nonwoven fabric 2 Fiber main body 2a Core part 2b Sheath part 3 Polyethylene glycol fatty acid ester 4 Chitosan surfactant

Claims (18)

At least on the surface of the fiber body whose surface layer is made of polyethylene,
A polyethylene glycol fatty acid ester which is an ester of a polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms,
And the fiber for short fiber nonwoven fabrics to which the chitosan surfactant adheres.   The fiber for a short fiber nonwoven fabric according to claim 1, wherein the polyethylene glycol fatty acid ester penetrates into the fiber main body by heating.   The fiber for a short fiber nonwoven fabric according to claim 1 or 2, wherein the fiber body is a core-sheath type composite fiber, the core part is formed of polypropylene or polyethylene terephthalate, and the sheath part is formed of polyethylene. .   The fiber for a short fiber nonwoven fabric according to claim 3, wherein the sheath part is high-density polyethylene.   The fiber for short fiber nonwoven fabric according to any one of claims 1 to 4, wherein the chitosan surfactant is obtained by acylating a part of chitosan with a long-chain fatty acid or an anhydride thereof.   The adhesion amount of the polyethylene glycol fatty acid ester is 0.2 to 0.5% by mass, and the adhesion amount of the chitosan surfactant is 0.1 to 1.0% by mass. The fiber for a short fiber nonwoven fabric according to any one of 5.   At least a polyethylene glycol fatty acid ester which is an ester of a polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms and a chitosan surfactant are attached to the surface of the fiber main body whose surface layer is made of high density polyethylene. Then, the manufacturing method of the fiber for short fiber nonwoven fabrics which has a drying heat processing process heated at the temperature of 90-110 degreeC.   The adhesion amount of the polyethylene glycol fatty acid ester after the drying heat treatment step is 0.2 to 0.5% by mass, and the adhesion amount of the chitosan surfactant is 0.1 to 1.0% by mass. The manufacturing method of the fiber for short fiber nonwoven fabrics of Claim 7.   The short fiber according to claim 7 or 8, wherein a core-sheath type composite fiber having a core part made of polypropylene or polyethylene terephthalate and a sheath part made of high-density polyethylene is used as the fiber main body. A method for producing non-woven fabric fibers.   The fiber for short fiber nonwoven fabric according to any one of claims 7 to 9, wherein the chitosan surfactant is a part of chitosan acylated with a long-chain fatty acid or an anhydride thereof. Manufacturing method. The fiber for short fiber nonwoven fabric according to any one of claims 1 to 6, which is heat-sealed,
A short fiber nonwoven fabric in which the amount of polyethylene glycol fatty acid ester attached to the fiber surface is 40% or less of the amount attached before heat sealing.   Nonwoven fabric fibers in which a polyethylene glycol fatty acid ester, which is an ester of polyethylene glycol having a molecular weight of 400 to 800 and a fatty acid having 10 to 20 carbon atoms, and a chitosan surfactant are attached to the surface of a fiber body whose surface layer is made of polyethylene The manufacturing method of the short fiber nonwoven fabric which has the process of heat-sealing.   The polyethylene glycol fatty acid ester adhesion amount on the nonwoven fabric fiber surface before heat fusion is 0.2 to 0.5 mass%, and the polyethylene glycol fatty acid ester adhesion amount on the nonwoven fabric fiber surface after heat fusion is heat fusion. It is 40% or less of the adhesion amount before wearing, The manufacturing method of the short fiber nonwoven fabric of Claim 12 characterized by the above-mentioned.   14. The short fiber nonwoven fabric according to claim 12, wherein a core-sheath type composite fiber having a core part made of polypropylene or polyethylene terephthalate and a sheath part made of polyethylene is used as the fiber main body. Production method.   The method for producing a short fiber nonwoven fabric according to claim 14, wherein the sheath portion of the core-sheath composite fiber is formed of high-density polyethylene.   The production of a short fiber nonwoven fabric according to any one of claims 12 to 15, wherein the chitosan surfactant is obtained by acylating a part of chitosan with a long-chain fatty acid or an anhydride thereof. Method.   A consumer product using the short fiber nonwoven fabric according to claim 11. The daily necessities according to claim 17, which are a mask, a simple body warmer, a paper diaper, a sanitary napkin or a panty liner.

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