JP2003119625A - Fiber for nonwoven fabric and the resultant nonwoven fabric and method for producing them - Google Patents

Fiber for nonwoven fabric and the resultant nonwoven fabric and method for producing them

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Publication number
JP2003119625A
JP2003119625A JP2002012065A JP2002012065A JP2003119625A JP 2003119625 A JP2003119625 A JP 2003119625A JP 2002012065 A JP2002012065 A JP 2002012065A JP 2002012065 A JP2002012065 A JP 2002012065A JP 2003119625 A JP2003119625 A JP 2003119625A
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JP
Japan
Prior art keywords
nonwoven fabric
fiber
sheath
obtained
step
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002012065A
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Japanese (ja)
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JP3322868B1 (en
Inventor
Atsushi Kajita
梶田篤史
Original Assignee
Ube Nitto Kasei Co Ltd
宇部日東化成株式会社
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Filing date
Publication date
Priority to JP2001241850 priority Critical
Priority to JP2001-241850 priority
Application filed by Ube Nitto Kasei Co Ltd, 宇部日東化成株式会社 filed Critical Ube Nitto Kasei Co Ltd
Priority to JP2002012065A priority patent/JP3322868B1/en
Application granted granted Critical
Publication of JP3322868B1 publication Critical patent/JP3322868B1/en
Priority claimed from TW92101291A external-priority patent/TWI285689B/en
Publication of JP2003119625A publication Critical patent/JP2003119625A/en
Application status is Active legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To provide a fiber for a nonwoven fabric in the form of an undrawn state of a sheath/core type conjugate fiber obtained by melt spinning, to obtain the nonwoven fabric having high mechanical strengths and bulkiness by thermofusing of a web comprising the above fiber, and to provide respective methods for producing the above fiber and nonwoven fabric. SOLUTION: This fiber F for the nonwoven fabric is such that undrawn yarns obtained by melt spinning of the sheath/core type conjugate fiber composed of a lower-melting polypropylene-based copolymer as the sheath and a higher-melting isotactic polypropylene as the core are crimped and cut into staple fibers. The 2nd objective nonwoven fabric N is obtained from the above fiber F. The 3rd objective method for producing the fiber F comprises the step P1 of obtaining the undrawn yarns by melt spinning of the conjugate fiber, the step P2 of crimping the undrawn yarns, and the step P3 of cutting the thus crimped undrawn yarns into the staple fibers. The other objective method for producing the nonwoven fabric N comprises the step P4 of forming the web W by using the staple fibers obtained through the steps P1 to P3 and the heating treatment step P5 of subjecting the web W to thermofusing by hot air.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to a method for producing a melt-spun product.
Obtained by crimping and cutting the sheath-core type composite fiber
Short-fiber-shaped non-woven fibers to be formed, formed from the fibers
Nonwoven fabrics obtained by heat-treating webs
Construction method. [0002] 2. Description of the Related Art In general, low-grade materials used in the production of nonwoven fabrics
From the sheath made of the melting point component and the core made of the high melting point component
Short formed from composed heat-fusible sheath-core composite fiber
The fibrous non-woven fabric fibers (staple fibers)
After being melt-spun by a melt spinning machine, it goes through a
Elongation is given and cut to fiber length according to application
Is done. In addition, the entanglement between fibers is sufficient.
Before cutting to make it easier to form a sheet-like web.
Is crimped with a crimper or the like to the drawn linear fiber.
It is common practice to apply crimps
is there. [0003] Here, in the production process of raw cotton for nonwoven fabric,
The stretching is performed in the same state as the molecular chains inside the fiber in the undrawn state.
The single fiber strength is too low to use because the strain is almost disorderly
It is based on common-sense knowledge that it will become something. Immediately
After the spinning process, the single fiber is drawn several times at a temperature below the melting point.
When stretched, the molecular chains that compose the fiber will move along the fiber axis.
Side by side (increased orientation), with moderate strength and elongation
It is said that fibers for nonwoven fabric can be obtained. Also,
By providing a drawing step, the spinneret of the melt spinning machine
Extrude the fiber thicker from the hole of
A single yarn having a thickness can be obtained. [0004] By the way, if it is conventionally adopted
Assume a manufacturing method that does not perform the stretching step that did not have
In order to extrude the fiber finely at the stage of melt spinning, spinning
It is necessary to increase the spinning speed.
Low melt spinning speed due to frequent cutting and other troubles
Need to be For this reason, productivity decreases
It is easily predicted. For these reasons,
It is considered common technical knowledge to perform a stretching process after melt spinning,
The use of sheath-core composite fibers was no exception.
available. [0005] SUMMARY OF THE INVENTION However, the conventional
Applying common-sense manufacturing methods to draw sheath-core composite fibers
When applied, the boundary between the sheath and the core depends on the load in the stretching step.
The surface peels off and the single yarn strength is significantly reduced.
The technical problem of contacting the sheath component by stretching
The molecular chain orientation of the adhesive resin advances, and the melting point of the resin itself rises
Not only to obtain practically used non-woven fabric properties
The technical challenge of narrowing the bonding temperature range for
The inventors of the present invention have newly found. Further, in a manufacturing method having a conventional stretching step,
Is a sheath made of a low-melting polypropylene copolymer
And a core made of high melting point isotactic polypropylene
Manufactured by a sheath-core composite fiber composed of
The non-woven fabric has a small melting point difference between the sheath component and the core component
Conventionally, point seal (pressure contact heating processing)
It is formed. Therefore, low shrinkage and low temperature
Difficult to expand to hot air fusion processing where adhesiveness is required
When hot air fusion is performed, hot air fusion (d
Commonly used as composite fiber to be fused through
Manufactured from polyethylene / polypropylene composite fiber
It was difficult to obtain bulkiness equivalent to that of the nonwoven fabric. [0007] Further, undrawn single yarn is compared with drawn single yarn.
Since the strength decreases and the elongation increases,
There is a general perception that it is inadequate due to reduced strength
Was. However, for sheath-core type composite fibers, do not perform drawing.
The problem of the decrease in single yarn strength due to
The problem of partial peeling of the sheath-core interface occurring in the stretching process
Larger, the strength of the non-woven fabric, heat-fused web
When the core component of the sheath component adhered between the fibers
It is newly determined that it largely depends on adhesion point destruction due to peeling.
Revealed. Accordingly, the present invention provides a method for melting sheath-core type composite fibers.
Conventional idea that it is necessary to provide a drawing process after spinning
Core-core composite fiber obtained by greatly converting and melt-spinning
For nonwoven fabric formed in a non-stretched state;
Strength and bulkiness obtained by heat-sealing a web of fiber
Excellent heat resistance, softness, sag resistance and heat sealability
To provide nonwoven fabrics and their manufacturing methods
Target. [0009] In order to achieve the above object,
In order to solve the technical problem, in the present invention, first, low melting
Point of the sheath made of polypropylene copolymer and high melting point
And a core made of isotactic polypropylene
Unspread obtained by melt-spinning the composed sheath-core composite fiber
Nonwoven fabric fiber obtained by crimping drawn yarn and cutting it into short fibers
I will provide a. [0010] The sheath copolymer is ethylene-p
Binary copolymers such as ropylene random copolymer, ternary
Any of the system copolymers (tapolymers) can be employed.
Using ethylene-propylene random copolymer for sheath
The ethylene content is in the range of 2-10%, preferably
Alternatively, those having a range of 3 to 8% can be used. Ma
Isotactic polypropylene used for the core
Can be any known crystalline polypropylene for fibers.
No. [0011] The fiber for nonwoven fabric according to the present invention can be produced by a conventional spinning method.
Based on the means, a sheath-core composite fiber is obtained by melt spinning,
Mechanical crimp of about 8 to 20 pieces / inch on the obtained undrawn yarn
Or by applying a natural crimp and cutting
it can. [0012] In the above means, the melt spinning is performed.
Since the sheath-core composite fiber is not stretched, it is melt-spun
The load of drawing is not applied to the single yarn. For this reason, the sheath and the core
There is an advantage that interfacial peeling can be eliminated. What
The cross-sectional shape of the heat-adhesive conjugate fiber employed in the present invention
Can be applied to both concentric and eccentric types. [0013] Next, in the present invention, obtained by the above means.
Fibers for nonwoven fabrics have low heat shrinkage and
With excellent adhesion and high adhesive strength
The web formed by the non-woven fabric fibers
By hot air fusion (air through fusion)
For bulkiness, softness, sag resistance and heat sealability
An excellent new quality nonwoven fabric can be provided. [0014] The new quality of such nonwoven fabrics is
The woven fabric has a breaking elongation of 100% in the machine machine direction (MD).
And the elongation recovery rate after 100% elongation is 50
Embodied by having the physical property of being%
(Hereafter, the elongation at break in the machine direction (MD)
Elongation ", after 100% elongation in the machine flow direction (MD)
The elongation recovery rate is simply referred to as “elongation recovery rate after 100% elongation”.
Abbreviated). In the present application, “elongation” means a nonwoven fabric
Shows the elongation ratio (elongation ratio) when compared with the initial length of
For example, a non-woven fabric with a length of 100 mm was stretched to 150 mm
The elongation at the time is 50%, and the elongation when stretched to 200 mm is
Shown as 100%. "Elongation at break" refers to nonwoven fabric
Means the elongation at the maximum load (break point) when
"Elongation recovery rate" means that the target nonwoven fabric was pulled
How much it recovers from its initial length when stretched
Is an index indicating whether or not “elongation after 100% elongation”
"Recovery rate is 50%" means pulling twice the initial length and releasing
When it returns to 1.5 times the initial length.
To taste. That is, the non-woven fabric according to the present invention comprises
It does not break even if it is stretched about twice,
The elongation recovery rate shows 50% even after 100%
Thus, it exhibits characteristics close to an elastic body such as rubber. like this
Physical properties clearly contribute to the above-mentioned new quality.
Conventional hot air fusion formed of drawn fiber
This is a property that can never be obtained with woven fabric. Next, the novel quality of the nonwoven fabric according to the present invention is described.
Means that the non-woven fabric has an elastic modulus at 40% elongation of 1
Realized by having physical properties of less than 000
Is done. In the present application, the “elongational elastic modulus” is referred to as
Is an index indicating the stretchability and stretch recovery of the nonwoven fabric.
, {[Load at extension (gf)} extension recovery rate (%)] x basis weight
(G / m2) × fusion temperature (℃)} ÷ 100
You. This coefficient indicates that the nonwoven fabric according to the present invention
As a result, the conventional nonwoven fabric
It turns out that it has a remarkably new elasticity that cannot be measured.
Therefore, this new physical property can be accurately quantified and specified.
As a result, the inventors of the present application have made intensive studies and
This is a devised indicator. In other words, this index is for undrawn fiber
This is an index unique to the nonwoven fabric formed by
It is based on regular technical ideas. The numerical value of the "elongational elastic modulus" is small.
The nonwoven fabric can be stretched with a small force, and has excellent recoverability
Can be objectively judged that Shaped with conventional drawn fiber
The general nonwoven fabric thus formed has an easily stretchable elastic modulus of 1500.
While the above values are shown, the nonwoven fabric according to the present invention has the coefficient
Is less than 1000, which is large
It has excellent elasticity, and such physical properties
Clearly contributed. In the present invention, the sheath is ethylene-pro
When composed of pyrene random copolymer
Has a fusion temperature range of 132 ° C. to 142 ° C.
When subjected to hot-air fusion, the bulk value is 70 cc / g or more.
Nonwoven fabric with physical properties to retain, or 132 ° C to 142 ° C
When the hot air fusion treatment is performed in the fusion temperature range within the range of
And constant load deformation is 150mm / g / mm2Hold more
The present invention can provide a nonwoven fabric having the following physical properties. The nonwoven fabric specified by the physical properties described above
Hot air fusion at least in the range of 134 ° C to 142 ° C
When processed, the bulk value of the predetermined value or more or the predetermined value
A material that can hold one or both of the load deformation amounts that are greater than or equal to the value
Characterized by having at least the property
Hot-melt in the nonwoven fabric manufacturing process
Specify or limit the range of the fusing temperature in the fusing process
Not necessarily. That is, the fiber for nonwoven fabric according to the present invention
According to the purpose and manufacturing conditions.
Performing hot air fusion treatment outside the fusion temperature range
Be free. The upper limit of bulkiness and the upper limit of load deformation
Is not specified in the nonwoven fabric according to the present invention.
The characteristic properties of bulkiness and softness at the lower limit
Physical properties of non-woven fabrics other than the present invention only by specifying
Can be clearly distinguished or distinguished from
This is because the delay will not be unclear. The sheath-core composite used in the nonwoven fabric according to the present invention
Due to the fact that the draw fiber has not been stretched at all,
The molecular orientation of the sheath component is suppressed, the heat shrinkage is low, and the melting point
It is said that it has excellent fusion property at low temperature because there is no rise
It has been demonstrated by the inventor that
And a web suitable for hot air fusion (air through) processing
Can be provided. And this web
If used, it is bulky and soft, sagging and heat resistant
A nonwoven fabric having excellent sealing properties can be provided. In addition, fusion of the sheath
Since the amount of heat is large and the sheath-core interface does not peel off,
Practically sufficient nonwoven fabric strength can be obtained. Further, the non-woven fabric according to the present invention has an unstretched non-woven fabric.
Higher fineness due to the use of woven fiber
To provide a nonwoven fabric composed of fibers and having excellent bulkiness.
And easier. Such non-woven fabrics have inter-fiber distances and voids
Diapers that require liquid permeability because of their size
Suitable as a surface material for sheets, sublayers, sanitary products, etc.
It becomes something. Further, the nonwoven fabric according to the present invention has excellent elasticity.
So that the bulk recovery and the twist
Excellent shape recovery from pulling. Also, the load
Thickness changes greatly at the time, soft touch, feel, texture
It has excellent elasticity as well as
Is particularly suitable for the above applications.
You. Next, in the present invention, the following (1) to (3)
Providing a “fiber manufacturing method for nonwoven fabrics”
I do. (1) A sheath made of a low melting point copolymer and a high melting point eye
And a core made of sotatic polypropylene.
Unspread to obtain undrawn yarn by melt-spinning the sheath-core type composite fiber
Drawing process. (2) a crimping step of crimping the undrawn yarn. (3) Cutting the crimped undrawn yarn into short fibers
Process. Then, the following steps (4) and (5) are performed.
Provided is a "method of manufacturing a nonwoven fabric". (4) Use the single yarn obtained from the above steps (1) to (3)
And forming a web. (5) A heat treatment step of fusing the web with hot air. This manufacturing method has the above-mentioned characteristics.
We can provide fibers for non-woven fabric and non-woven fabric,
Since the stretching process is not included at all, the stretching device itself
There is a great advantage that is unnecessary. That is, the manufacturing process
Can reduce the cost of equipment used for
Time and energy related to steam and electricity
Therefore, production costs can be reduced. As described above, the present invention provides a melt-spun
High quality obtained by using sheath-core composite fibers in an undrawn state
Fibers for nonwoven fabrics and nonwoven fabrics, and their manufacturing technologies
Provided to nonwoven fabric manufacturing, garment manufacturing, sanitary industries, etc.
It has the technical significance of providing. In addition, low melting point
A sheath made of polypropylene copolymer and a high melting point
And a core made of isotactic polypropylene
The sheath-core type conjugate fiber is
Improved to have shrinkage and low-temperature adhesion, hot air fusion
Has the technical significance of enabling nonwoven fabric production
ing. [0030] Next, a preferred embodiment of the present invention will be described.
This will be described with reference to the attached drawings and tables.
First, the fiber for nonwoven fabric according to the present invention and the fiber for nonwoven fabric
A preferred method for producing a nonwoven fabric obtained from
You. FIG. 1 (A) shows a method for producing a nonwoven fabric fiber according to the present invention.
FIG. 3 is a process flow chart simply showing the steps of the method. The symbol P in FIG.1The process indicated by
Point ethylene-propylene random copolymer other
A sheath made of a copolymer such as a random copolymer,
A core made of isotactic polypropylene
Melt-spinning of sheath-core conjugate fiber composed of
To obtain an undrawn yarn until the yarn is drawn
Formation process ". This process P1Spinning in Japan
Can use existing sheath-core type composite fiber spinning equipment
It is. The fineness of the melt-spun single yarn is 1 to 30 d.
tex (decitex), more preferably 2 to 20 dt
ex. The symbol P in FIG.2The step indicated by the above
Undrawn yarn forming process P1Crimp the undrawn yarn obtained in step
This shows a crimping step. This crimping process P2Are fibers and fibers
Enhance the entanglement of the fibers and use a sheet-shaped web
The purpose is to make it easy to form
Crimper such as existing stuffing box type
-Mechanical crimping or natural crimping is performed using equipment or the like. The number of crimps is 8 to 20 pieces / inch.
More preferably, 12 to 18 pieces / inch, the crimp ratio is 10 to 10.
20%, more preferably 12-18%. This range
If the crimp rate is lower, the single fiber is
Malfunctions such as the occurrence of cotton wool etc.
And the production efficiency is reduced.
If the shrinkage is higher than this range, the
Etc., when forming a web with a sanding machine, etc.
This is because there is a problem. The symbol P in FIG.3The process indicated by is crimped
This is a step of cutting the drawn undrawn yarn into short fibers. This
Cutting process P3Adds finishing oil to crimped single yarn
And dried at a specified temperature to cut to a specified fiber length.
To obtain staple fibers in the form of short fibers.
It is about. The above process P1~ P3By the present invention
Such a nonwoven fabric fiber F can be manufactured. This non-woven
The fabric fiber F has a low melting point, low shrinkage, and a high heat of fusion.
No peeling of sheath-core interface due to stretching.
It is particularly suitable for use in the production. Next, FIG. 1B shows a nonwoven fabric according to the present invention.
FIG. 4 is a process flow diagram simply showing a manufacturing process of the manufacturing method.
First, a symbol P shown in FIG.4Is the fiber for the nonwoven fabric
F is dispersed and deposited to form a sheet-like web W
It is a process. For example, the fiber F for non-woven fabric is
Through a card machine or the like, a predetermined basis weight for the desired purpose is averaged.
A web W having a uniform thickness is formed. The symbol P shown in FIG.5Is a web type
Composition process P4For hot-web fusion of web W obtained from
This is a processing step. This web forming process P4Is
The purpose is to combine the fibers of the W
It is a process that is performed. This process P5Is the heat adjusted to the predetermined wind speed
Selectively adopting a wind fusion (air through) device,
The web W is supplied to the fusion device at a predetermined speed. And
By performing heat treatment with hot air at a predetermined temperature for a predetermined time
Thus, the hot-air-sealed nonwoven fabric N can be obtained. [0038] EXAMPLES Hereinafter, examples of the nonwoven fabric fiber F according to the present invention will be described.
And a comparative example. <Example 1-1 (fiber for nonwoven fabric according to the present invention)
Example of fiber F)> MFR (based on ASTM D (L)
Ethylene with a melting point of 135 ° C.
-Propylene random cup with 4.3% ethylene content
Rimmer (Product name: Idemitsu Polypro Y2043GP, Idemitsu Stone
Oil Chemical Co., Ltd.)
Used. On the other hand, MFR is 20 and melting point is 165 ° C.
Crystalline type polypropylene (Product name: Idemitsu Polypro
  Y2005GP, manufactured by Idemitsu Petrochemical Co., Ltd.)
Used as a high melting point polymer. Two single screw extruders
And a nozzle for a composite fiber having a hole diameter of 0.4 mm.
The spinning temperature is 280 using a core-sheath core type composite fiber spinning facility.
Attach spinning oil at ℃, take-off speed 900m / min
Melt spinning, and the cross-sectional area ratio of the sheath and the core is 5: 5,
Unstretched concentric sheath core having a single yarn fineness of 3.7 dtex
A type composite fiber was obtained. Next, the concentric sheath-core composite fiber
Staple fiber
-In the prototype equipment, the temperature of the first stretching roller is 30 ° C,
The temperature of the second and third stretching rollers is 30 ° C.
Without heating, the first stretching roller and the second stretching roller and the second
3 Set the stretching roller at the same speed,
Mechanical crimp was applied by a limp. Then,
Drying treatment at 80 ° C.
The fiber is cut to a fiber length of 51 mm by the device, and the single yarn fineness is 3.
7dtex staple fiber non-woven fabric
I got a fiber. Fineness of the obtained single yarn, number of crimps, crimp ratio, single yarn
The physical properties consisting of the heat shrinkage were measured. Table 1 shows the measurement results.
It was shown to. The strength and elongation of the single yarn, the heat shrinkage of the single yarn
Was measured according to JIS L1015. <Example 1-2 (fiber for nonwoven fabric according to the present invention)
Example of fiber F)> MFR (based on ASTM D (L)
Ethylene having a melting point of 132 ° C.
Content of 5.0% (higher than Example 1-1)
-Propylene random copolymer (product name: PM94
0M, manufactured by Sun Allomer Co., Ltd.)
Used as a marker. On the other hand, the high melting point polymer which is the core component
Is the same as that used in the core component of Example 1-1.
A polymer with a melting point of 165 ° C. was used. In addition, fiber manufacturing
The case is the same as in the above Example 1-1, and the description is omitted.
I do. <Comparative Example 1 (fiber F for nonwoven fabric according to the present invention)
Comparative Example)> Melt spinning using the same material as in Example 1 above
After performing the yarn to obtain the concentric sheath-core type composite fiber, the same as in Example 1 is performed.
The temperature of the first drawing tank of the staple fiber prototype
Set to 0 ° C, first stretching roller and second stretching roller
And a single-stage drawing at a draw ratio of 2.0 times between
A 3.7 dtex thermoadhesive fiber was obtained, identical to Example 1.
Crimping and cutting were performed under the conditions. The physical properties of the obtained single yarn
It was measured according to IS L 1015. Table 1 shows the measurement results.
Shown in [0042] [Table 1] From Table 1 given above, it can be seen from Examples 1-1 and Examples
The respective thermal shrinkage rates of the nonwoven fabric fibers according to 1-2 are those of Comparative Example 1.
Very small, about 1/4 of 0.6% and 0.5%, non-woven
It is clear that there is almost no shrinkage due to heating when fabricating
Single-strand heat shrink suitable for use in hot-air fusion nonwoven fabric
1.5% or less, which is assumed as a rate, particularly suitable
1.0% or less. Therefore, the fiber for nonwoven fabric according to the present invention
Wei is very suitable for nonwoven applications. Hereinafter, examples of the nonwoven fabric N according to the present invention and
A comparative example will be described. <Example 2 (Implementation of nonwoven fabric N according to the present invention)
Example)> The non-woven fabric fiber obtained in Example 1-1 was used
Roller card machine with 350mm width (Daiwa Kiko Co., Ltd.)
Roller, sample roller card: SC360DIR)
Then, at a discharge speed of 9.5 m / min, a basis weight of 25 g
/ M2Formed a uniform web. Next, this wafer
5m / min in a hot-air fusing device where the wind speed is adjusted to 2m / sec.
At a speed of 136 ° C. for 5 seconds.
A hot air fused nonwoven fabric was obtained. In addition, the hot air temperature is set to 134, 13
Under the same conditions except that the temperature was changed to 8, 140, 142 ° C,
Hot-air fusion nonwoven fabrics were obtained respectively. And the strength of each nonwoven fabric
Force, bulk, elongation at break, constant load deformation, elastic reduction
Was. The measurement results are shown in Table 2 below. It should be noted that the above-mentioned embodiment 2 and embodiments 3 to 3 to be described later will be described.
5 and the measurement method of the non-woven fabric properties adopted in Comparative Example 2 are as follows:
It is as follows. <Strength of nonwoven fabric, elongation at break> Strength of machine flow direction (M
D strength) is 50 mm in width and 14 in length from the obtained nonwoven fabric.
Cut out a 0 mm sample, and for this sample,
Chuck interval 100mm, pulling speed 40mm / mi
It measured on condition of n. Power in the direction perpendicular to the machine flow
(CD strength) is 50 mm width and length from the obtained nonwoven fabric.
Cut out a 100 mm sample, and for this sample,
Chuck interval 60mm, pulling speed 40mm / min
Was measured under the following conditions. The unit of nonwoven fabric strength is N (New
-Ton) (1 kgf = 1 kg x 9.80665 m / s)2
= 9.80665N). Elongation at break in machine direction
Is the maximum in the MD strength measurement in the above strength measurement.
It is the elongation at the point of large load (break point). <Bulkiness of the nonwoven fabric> 5 cm x 5 cm from the obtained nonwoven fabric
Cut out 10 samples, the volume of these samples
Bulk (cm) based on (V) and weight (M)3/ G) = V
/ M = 5 × 5 × h (height) / M
I did. In addition, V is obtained by stacking 10 samples
30 seconds after unloading when a load of 20 g is applied for 30 seconds
The total volume of (cm3), M is the sum of 10 samples
The total weight (g) and h are obtained by stacking 10 samples.
30 seconds after unloading when a load of 20 g is applied for 30 seconds
It was determined by the overall height (cm) later. <Constant load deformation> 5 cm x 5 cm from the obtained nonwoven fabric
10 samples are cut out and stacked, and 5cm x 5
An acrylic plate of cm × 2 mm in thickness was placed. Universal testing machine
(Product name: RTA-100, manufactured by ORIENTEC)
In the test mode, so that it does not touch the acrylic plate
Move the compression point to a degree. At this time, the compression load is zero
Is confirmed, and this point is set to 0 for the compression deformation displacement.
Points. Compress at a test speed of 5 mm / min,
Weight is 100 g (0.04 g / mm2) When the pressure
Stop shrinking, read the displacement at that time, and
Shape (mm / g / mm2) = Displacement (mm) /0.04
(G / mm2) Is calculated based on the formula
Issued. The amount of constant load deformation depends on the softness and
When the constant load deformation amount is large,
Indicates that it has the property of deforming significantly with a small force.
And it turns out that the nonwoven fabric is soft. <Elasticity reduction rate> The same conditions as for the constant load deformation measurement and the compression load
When the weight reaches 100 g, stop the compression and leave for 3 mm
I do. Read the compression load after standing for 3 minutes, and reduce the elasticity by the following formula.
Fractional rates were calculated. Elastic reduction rate (%) = [(100−P)
/ 100] × 100. P represents the compression load after standing for 3 minutes.
You. This rate of elastic reduction is an index that indicates the sag resistance of the nonwoven fabric.
If the rate of decrease in elasticity is small,
Is better. <Example 3 (Implementation of nonwoven fabric N according to the present invention)
Example)> Above except for spinning at a take-up speed of 680 m / min
Under the same conditions as in Example 1-1, the single yarn fineness was 6.6 dtex.
A non-woven fabric fiber was obtained. Then, the same manufacturing as in the second embodiment is performed.
Depending on the method, hot air temperature 134, 136, 138, 14
Under each condition of 0 and 142 ° C., a hot-air fusion non-woven fabric was obtained, respectively.
Was. The physical properties of the hot-air fusion nonwoven fabric were measured in the same manner as described above.
Specified. The measurement results are shown in Table 2 below. <Example 4 (Implementation of nonwoven fabric N according to the present invention)
Example)> Above except for spinning at a take-up speed of 450 m / min
Under the same conditions as in Example 1-1, a single yarn fineness of 10 dtex
A fiber for woven fabric was obtained. Then, the same manufacturing method as in the second embodiment is used.
Hot air temperatures 134, 136, 138, 140,
Under each condition of 142 ° C., a hot-air fusion nonwoven fabric was obtained.
The physical properties of the hot-air fusion nonwoven fabric were measured in the same manner as above.
Was. The measurement results are shown in Table 2 below. <Example 5 (Implementation of nonwoven fabric N according to the present invention)
Example)> Fiber for nonwoven fabric obtained according to Example 1-2 above
Is passed through a roller card machine having a width of 350 mm to obtain a basis weight 2
5g / m2Formed a uniform web. Then this
5m to hot air fusing device adjusted web speed to 2m / sec
/ Minute, and treated at a hot air temperature of 136 ° C for 5 seconds.
Thus, a hot-air fusion nonwoven fabric was obtained. The hot air temperature is 132,
Same conditions except for changing to 134, 136 and 138 ° C
Respectively, to obtain hot-air fusion nonwoven fabrics. And each
Measure the strength, bulk, constant load deformation, and elastic reduction rate of the woven fabric.
Was. The measurement results are shown in Table 2 below. <Comparative Example 2 (Comparison of nonwoven fabric N according to the present invention)
Example) The non-woven fabric fiber obtained in Comparative Example 1 was
Under the manufacturing conditions of the nonwoven fabric shown in Example 2, the hot air temperature 13
6, 138, 140, 142 and 144 ° C.
A wind-sealed nonwoven fabric was obtained. The properties of each hot-air fusion nonwoven fabric
It was measured in the same manner. The measurement results are shown in Table 2 below. What
In addition, "Et-cont" in Table 2 means the low melting point of the sheath component.
Represents the ethylene content of the polymer. [0051] [Table 2] Based on the data shown in Table 2, fusion was performed.
Nonwoven fabric strength (CD) against temperature (° C) change, nonwoven fabric
Strength (MD), bulk, elongation at break, constant load deformation, elastic reduction
Each change is shown in FIGS. According to Table 2 and FIGS.
The nonwoven fabric is 132 ° C (Example 5), 134 ° C, 136 ° C
Nonwoven fabric strength (CD, MD) is large even at low fusion temperature
(See Table 2 and FIG. 2). In other words, the adhesive strength is large even at low temperatures.
And strong fluctuation due to fusing temperature is flat,
Wide temperature range for use. On the other hand, comparison using double drawn fiber
In the non-woven fabric of Example 2, the non-woven fabric was strong at a fusion temperature of around 139 ° C.
Since the force changes rapidly, the operating temperature range is narrow (see Fig. 2).
See). The nonwoven fabric according to the present invention has
Over the entire experimental fusing temperature of 42 ° C.,
Excellent in properties (see Table 2 and FIG. 3), 134 ° C. to 14
The hot air fusion treatment was performed in a fusion temperature range of 2 ° C.
Occasionally, it has physical properties to maintain bulk value of 70 cc / g or more.
ing. Comparative Example 2 even at fusing temperatures of 140 and 142 ° C.
Is also bulky. That is, even in terms of bulkiness, it can be used.
Since the temperature range is wide, processing is easy. The elongation at break was the same as that of Examples 2 to 5.
The elongation at break is 10 at all fusion temperatures
It showed 0% or more. That is, even if it is extended to twice the initial length
No break phenomenon occurs. From this, the failure according to the present invention
It is clear that woven fabric has a very large amount of nondestructive deformation.
Was. On the other hand, the nonwoven fabric of Comparative Example 2 using the drawn fiber
34.1% at fusion temperature of 138 ° C, 6 at fusion temperature of 144 ° C
It is as low as 5.2. That is, the nonwoven fabric of Comparative Example 2 was stretched by 100%.
I can't extend it. From this, the failure of Comparative Example 2
The woven fabric has a nondestructive deformation amount as compared with the nonwoven fabrics of Examples 2 to 5.
Was small (see Table 2 and FIG. 4). The non-woven fabric according to the present invention has an experimental temperature
The constant load deformation of the nonwoven fabric surface is large over the entire range (see Table
2, see FIG. 5). Specifically, the range of 132 ° C. to 142 ° C.
When the hot air fusion treatment is performed in the fusion temperature range in the box,
Constant load deformation is 155mm / g / mm2Hold more
Has physical properties. That is, the nonwoven fabric according to the present invention is small.
Non-woven fabric with the property that it can be greatly deformed by
It is also excellent in terms of softness (softness). Further, the non-woven fabric according to the present invention has a maximum experimental temperature.
Over the range, the elastic modulus reduction rate is about 19.9 to 22.3%
(See Table 2 and FIG. 6).
It can be seen that it has excellent resilience. Thus, the unstretched fiber according to the present invention is obtained.
If fiber F is used, 1
Adopting a wide range of fusion temperature from 32 to 142 ° C,
Non-woven fabric has excellent strength, bulkiness, elasticity, softness, and sag resistance
Can be manufactured. Next, the nonwoven fabrics of Examples 2 to 5 and Comparative Example 2
"Test 1" for verifying the elongation recovery of the fabric was performed.
First, each nonwoven fabric is 140 mm long in the MD direction,
The sample was cut out to a width of 50 mm to obtain a sample nonwoven fabric. Continued
Universal testing machine (trade name: RTA-100, ORIEN)
TEC) in the tensile test mode.
Set to 0 mm, there is no loosening of the nonwoven fabric, and the load is 0
The sample non-woven fabric was carefully fixed so as to obtain. Soshi
The sample nonwoven fabric was tested at a test speed of 50 mm / min.
And each elongation of 10, 20, 40, 60, 80, 100%
After the elongation to a test speed of 50 mm / min
Elongation was restored under the conditions. During this recovery process, the load becomes zero.
The displacement (mm) at the time of reading was read. The displacement is
When the distance between the chucks is 100 mm when the sample nonwoven fabric is fixed.
Is the position where the origin is 0. Where: [Displacement of load 0 at elongation recovery (mm) ÷ initial length 100 mm]
× 100 , The elongation strain rate (%) was calculated. Next, the following equation: 100-Elongation strain rate (%) , The elongation recovery rate (%) was calculated. The results of the elongation recovery rate are shown in Table 3 below. [0063] [Table 3] From Table 3 above, it can be seen that the unstretched fiber
The nonwoven fabrics of Examples 2 to 5 have a 100% elongation rate (
In the case of (elongation), the elongation recovery rate was about 50%.
From this, the nonwoven fabric according to the present invention is formed from drawn fibers.
Physical properties similar to rubber-like elastic materials not found in the formed nonwoven fabric
It was found to have Note that the “elongation rate”
Indicates the extent of extension compared to the initial length.
For example, when the elongation rate is 50%, the length is increased to 1.5 times the initial length.
(Table 4 below). Next, the nonwoven fabrics of Examples 2 to 5 and Comparative Example 2
Conducted "Test 2" to examine the elasticity of fabric
Was. Each elongation of 10, 20, 40, 60, 80, 100%
The load at is defined as “load at extension (gf)”
Hour load (gf) and Examples 2 to 5 obtained in the above Test 1 and
The following formula using the elongation recovery rate (%) of each elongation of Comparative Example 2; {[Load at elongation (gf) ÷ Elongation recovery rate (%)] × Weight (g
/ M2) x fusion temperature (° C)} ÷ 100 , The elastic modulus of easy elongation was determined. The results are shown in the table below.
It is shown in FIG. In this equation, the basis weight and the fusion temperature are multiplied.
The reason is that the higher the basis weight or the fusion temperature
The higher the nonwoven fabric, the harder the nonwoven fabric tends to lose elasticity.
This is because that. [0066] [Table 4] From the above Table 4, it can be seen that the nonwoven fabrics of Examples 2 to 5
In terms of the elastic modulus at 40% elongation,
It was 1000 or less under all the fusion temperature conditions. Meanwhile, compare
The nonwoven fabric of Example 2 has an elongation of 40% and a fusion temperature of 144 ° C.
05.7 was shown. This easy elongation modulus is determined by the elongation of the nonwoven fabric.
It is an index that accurately represents the ease of elongation and the recovery from growth.
The smaller the value, the more the non-woven fabric can be stretched with a small force.
It shows that it has excellent long recovery. From this,
The nonwoven fabric according to Ming is easy to stretch and
It is clear that it is excellent. As described above, the nonwoven fabric according to the present invention has a high strength.
With power and great elasticity, bulkiness, softness and texture
They also have excellent set resistance, so they are the top of diapers
Especially as a surface material for sheets, sublayers, sanitary products, etc.
It is also suitable for female material of fastener tape, fill
It is also suitable for base materials for
Value is high. Further, in general, it is used as a hot-air fusion nonwoven fabric.
Polyethylene / polypropylene nonwoven fabric used
Adhesiveness to hot melt and heat sealing
It has the characteristic that it is excellent in characteristics. [0070] The fiber for a nonwoven fabric according to the present invention is melt-spun.
Since the drawn sheath-core conjugate fiber is not stretched,
Since the drawing load is not applied to the composite fiber, the sheath and core
Interfacial peeling of the part can be eliminated. Further, the nonwoven fabric fiber according to the present invention has
Low shrinkage, excellent fusion at low temperatures, and strong adhesion
Has the characteristic that the
Web suitable for hot air fusion (air through) treatment at temperature
Non-woven fabric with excellent bulkiness using this web
Cloth can be provided. Further, the fiber for nonwoven fabric according to the present invention is not
Because it is stretched, a nonwoven fabric made of a single yarn with a greater fineness,
In other words, it has excellent bulkiness, large inter-fiber distance and voids, and liquid permeability
It is possible to provide an excellent nonwoven fabric. A sheath made of a low melting point copolymer and a high melting point
And a core made of isotactic polypropylene
By making the composed sheath-core composite fiber undrawn,
As it comes to have low shrinkage and low-temperature adhesion,
Non-woven fabric can be manufactured by
You. Next, the nonwoven fabric according to the present invention has a large bulk.
High elasticity, excellent bulk recovery, twisting and pulling
It is also excellent in shape recovery properties. Also soft
Retains tactile sensation, feel and texture, stretches nonwoven fabric in the horizontal direction
It has high utility value because it has the characteristic of Next, a method for producing the nonwoven fabric fiber according to the present invention is described.
Method and nonwoven fabric manufacturing method include a stretching step in the process
No stretching equipment is required,
In addition to reducing the cost of equipment used in the process,
Saves the time and energy involved in steam and electricity
Production costs can be reduced. Also,
High strength and bulk over a wide range of welding temperatures
Severe temperature control during non-woven fabric processing is unnecessary, and
A nonwoven fabric with a soft feel can be manufactured. As described above, the present invention provides an unstretched fiber.
There is no conventional nonwoven fabric and its manufacturing technology.
It creates a completely new technological trend.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (A) Simplified process flow diagram of the method for producing nonwoven fabric fibers according to the present invention (B) Simple process flow diagram of the nonwoven fabric production method according to the present invention (A) Diagram showing the change in nonwoven fabric strength (CD) with respect to the fusing temperature (graph) (vertical unit is N (Newton) based on Table 2 data)
(B) A graph (graph) showing the change in nonwoven fabric strength (MD) with respect to the fusing temperature (vertical unit is N based on Table 2 data)
(Adopts Newton)) FIG. 3 is a graph showing a change in bulk of the nonwoven fabric with respect to the fusing temperature (graph). FIG. 4 is a diagram showing a change in elongation at break of the nonwoven fabric with respect to the fusing temperature (graph). FIG. 6 is a graph showing a change in the constant load deformation of the nonwoven fabric with respect to the fusing temperature. FIG. 6 is a graph showing a change in the elastic reduction rate of the nonwoven fabric with respect to the fusing temperature. step of the method for manufacturing the nonwoven fabric according to fiber N present invention nonwoven fabric P 1 to P 3 this step P 1 to P 5 present invention of a method of manufacturing a nonwoven fabric according to the invention according to

────────────────────────────────────────────────── ───
[Procedure amendment] [Date of submission] January 29, 2002 (2002.1.2
9) [Procedure amendment 1] [Document name to be amended] Description [Item name to be amended] Claim 3 [Correction method] Change [Content of amendment] [Claim 3] The breaking elongation in the machine flow direction (MD) is 1
The nonwoven fabric according to claim 2, wherein the nonwoven fabric has a stretch recovery rate of 100% or more and a stretch recovery rate after 100% stretch of 50% or more . [Procedure amendment 2] [Document name to be amended] Description [Item name to be amended] 0016 [Amendment method] Change [Content of amendment] That is, the nonwoven fabric according to the present invention is composed of two nonwoven fabrics.
Even if it is stretched about twice, it does not break, and even after 100% elongation, it exhibits an elongation recovery rate of 50% or more , exhibiting characteristics close to an elastic body such as rubber. Such physical properties clearly contribute to the above-mentioned novel quality, and are physical properties which can never be obtained with the conventional hot-air-fused nonwoven fabric formed of drawn fibers. [Procedure amendment 3] [Document name to be amended] Description [Item name to be amended] 0064 [Correction method] Change [Contents of amendment] From Table 3 shown above, Examples 2-5 formed of undrawn fibers The nonwoven fabric of No. showed an elongation recovery rate of 50% or more even when the elongation rate was 100% (extended to double length).
From this, it became clear that the nonwoven fabric according to the present invention has physical properties close to an elastic body such as rubber which is not present in the nonwoven fabric formed from drawn fibers. The “elongation rate” indicates how much the elongation is performed compared to the initial length. For example, an elongation rate of 50% means that the elongation is performed to 1.5 times the initial length (see below). Table 4 below). [Procedure amendment] [Date of submission] May 15, 2002 (2002.5.1)
5) [Procedure amendment 1] [Document name to be amended] Description [Item name to be amended] Claim 7 [Amendment method] Change [Content of amendment] [Claim 7] Sheath made of low-melting polypropylene copolymer An undrawn yarn forming step of melt-spinning a sheath-core conjugate fiber composed of a high melting point isotactic polypropylene core to obtain an undrawn yarn, and crimping the undrawn yarn A method for producing a nonwoven fabric fiber, comprising: a crimping step; and a cutting step of cutting a crimped undrawn yarn into short fibers. [Procedure amendment 2] [Document name to be amended] Description [Item name to be amended] Claim 8 [Correction method] Change [Content of amendment] [Claim 8] A sheath made of a low melting point polypropylene-based copolymer, A core portion made of a high melting point isotactic polypropylene, and an undrawn yarn forming step of obtaining an undrawn yarn by melt-spinning a sheath-core conjugate fiber composed of: a crimping process for crimping the undrawn yarn. A step of cutting the crimped undrawn yarn into short fibers; a web forming step of forming a web using the single yarn obtained by the above steps; and hot-air fusion of the web A method for producing a nonwoven fabric, comprising: a heat treatment step. [Procedure amendment 3] [Document name to be amended] Description [Item name to be amended] 0026 [Correction method] Change [Content of amendment] Next, in the present invention, the following steps (1) to (3) And "a method for producing a nonwoven fabric fiber". (1) A sheath-core composite fiber composed of a sheath made of a low-melting polypropylene copolymer and a core made of a high-melting isotactic polypropylene is melt-spun to obtain an undrawn yarn. Drawing yarn forming step. (2) a crimping step of crimping the undrawn yarn. (3) A cutting step of cutting the crimped undrawn yarn into short fibers. [Procedure amendment 4] [Document name to be amended] Description [Item name to be amended] 0073 [Correction method] Change [Content of amendment] [0073] A sheath made of a low melting point polypropylene copolymer and a high melting point iso By making the sheath-core composite fiber composed of a core made of a static polypropylene and a sheath-core type composite fiber composed of unstretched, low-shrinkability and low-temperature adhesiveness can be obtained. Will be able to

   ────────────────────────────────────────────────── ─── Continuation of front page    F term (reference) 4L036 MA04 MA15 MA25 MA33 MA40                       PA36 RA04                 4L041 AA07 BA02 BA05 BA21 BA22                       BA49 BB07 BC04 BD11 CA38                       DD01 DD05                 4L047 AA14 AA27 AB02 AB09 AB10                       BA23

Claims (1)

  1. Claims: 1. A melt-spun sheath-core composite fiber composed of a sheath made of a low-melting-point polypropylene copolymer and a core made of a high-melting-point isotactic polypropylene. A fiber for nonwoven fabric, characterized in that the undrawn yarn obtained by the above is crimped and cut into short fibers. 2. A non-woven fabric obtained by subjecting a web formed from the undrawn fiber for non-woven fabric according to claim 1 to a hot-air fusion treatment. 3. The breaking elongation in the machine direction (MD) is 1
    The nonwoven fabric according to claim 2, wherein the nonwoven fabric has a stretch recovery rate of at least 00% and a stretch recovery rate after 100% stretch of 50%. 4. The elastic modulus at 40% elongation is 100%.
    3. The nonwoven fabric according to claim 2, wherein the value is 0 or less. 5. The method according to claim 5, wherein the sheath is composed of an ethylene-propylene random copolymer.
    The material having at least a physical property of maintaining a bulk value of 70 cc / g or more when subjected to the hot-air fusion treatment in a fusion temperature range of from 0C to 142C.
    The nonwoven fabric according to any one of the above. 6. The method according to claim 6, wherein the sheath is composed of an ethylene-propylene random copolymer.
    When the hot-air fusion treatment is performed in a fusion temperature range within a range of from 0 ° C. to 142 ° C., the constant load deformation amount is 155 mm / g / mm.
    The nonwoven fabric according to any one of claims 2 to 4, wherein the nonwoven fabric has at least physical properties for holding two or more. 7. An undrawn yarn obtained by melt-spinning a sheath-core composite fiber composed of a sheath made of a low melting point copolymer and a core made of a high melting point isotactic polypropylene. A fiber for a nonwoven fabric, comprising: a drawn yarn forming step; a crimping step of crimping the undrawn yarn; and a cutting step of cutting the crimped undrawn yarn into short fibers. Manufacturing method. 8. An undrawn yarn obtained by melt-spinning a sheath-core composite fiber composed of a sheath made of a low melting point copolymer and a core made of a high melting point isotactic polypropylene. A drawn yarn forming step, a crimping step of crimping the undrawn yarn, a cutting step of cutting the crimped undrawn yarn into short fibers, and using the single yarn obtained by the above steps. A web forming step of forming a web by heat treatment, and a heat treatment step of hot-sealing the web by hot air.
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KR101415384B1 (en) 2006-02-06 2014-07-04 데이진 화이바 가부시키가이샤 Heat-bondable conjugated fiber and process for production thereof
JP2007204900A (en) * 2006-02-06 2007-08-16 Teijin Fibers Ltd Polyester fiber for air-laid nonwoven fabric and method for producing the same
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JP2007303035A (en) * 2006-05-12 2007-11-22 Teijin Fibers Ltd Spontaneously elongative and thermo conjugate fiber and method for producing the same
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