JPH08267629A - Dry non-woven fabric and its production - Google Patents

Abstract

PURPOSE: To provide a bulky dry non-woven fabric in which uniformity is not lowered and uneven thickness is not generated even the weight is small and no seal mark is formed after heat sealing and heat-sealed part can keep its fiber layer. CONSTITUTION: A dry non-woven fabric contains 40-95 pts.wt. opened fiber (A) prepd. by opening a composite resin film with a high m.p. resin layer consisting of a polypropylene resin as a main component and a low m.p. resin layer consisting of a thermoplastic resin film with a lower m.p. than that of the polypropylene resin as a main component and 60-5 pts.wt. fiber consisting of a resin with a m.p. being higher than that of the polypropylene resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry non-woven fabric and a method for producing the same, and more particularly to a dry non-woven fabric suitable as a packaging material to be heat-sealed and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, various kinds of packaging bags such as desiccants, insect repellents, dehumidifying agents, rust preventives, bath agents, soup bags, bags for packaging alcoholic beverages, and various packaging bags such as clothing covers. Nonwoven fabrics are used as packaging materials. This non-woven fabric is often heat-sealed at the time of molding or packaging in order to fuse the joints.

Conventionally, as these non-woven fabrics, there are a non-woven fabric by a spun bond method in which continuous fibers are entangled, and a dry non-woven fabric in which defiberized fibers such as split fibers are entangled by being entangled by a carding machine or the like. As a method for obtaining the defibrated fibers used in this dry nonwoven fabric, for example, Japanese Patent Application Laid-Open No. 1-2215
No. 07, No. 3-82839, JP-A-62-1
Various methods have been proposed in Japanese Patent Publication No. 49905. The dry non-woven fabric is made up of defiberized fibers obtained by these methods.
After being cut to a length of about 50 mm, it is hung on a carding machine to entangle the defiberized fibers. The defibrated fibers obtained by these methods have a fibril structure composed of trunk fibers having a fineness of about 50 to 60 d and branch fibers having a fineness of 0.5 d or less.

[0004]

However, the non-woven fabric produced from the defibrated fibers obtained by the above-mentioned conventional method has poor homogeneity and uneven thickness when the basis weight is small. When this non-woven fabric is pressed while being heated during heat sealing,
In the heat-sealed portion, the unwound fiber is melted to form a film, and a seal mark is generated to deteriorate the appearance.

Therefore, an object of the present invention is to maintain the fibrous layer on the surface without reducing the homogeneity, causing unevenness in thickness and thickness, and not forming a seal mark at the time of heat sealing even if the basis weight is small. The object of the present invention is to provide a bulky dry non-woven fabric.

[0006]

In order to solve the above problems, the present invention comprises a high melting point resin layer containing a polypropylene resin as a main component and a thermoplastic resin having a melting point lower than that of the polypropylene resin as a main component. Includes 40 to 95 parts by weight of defibrated fibers (A) obtained by defibrating a composite resin film having a low melting point resin layer, and 5 to 60 parts by weight of fibers (B) made of a resin having a melting point higher than that of polypropylene resin. A dry non-woven fabric is provided.

The present invention also provides, as the method for producing the dry nonwoven fabric, a high melting point resin layer containing a polypropylene resin as a main component and a low melting point resin layer containing a thermoplastic resin having a melting point lower than that of the polypropylene resin as a main component. And a step of preparing a defibrated fiber (A) by defibrating a composite resin film having the following: and the defibrated fiber and a fiber (B) made of a resin having a melting point higher than that of the polypropylene resin are mixed to form a nonwoven fabric. The present invention also provides a method for producing a dry non-woven fabric, which includes a step.

The dry nonwoven fabric of the present invention and the method for producing the same will be described below in detail.

The dry nonwoven fabric of the present invention comprises a high melting point resin layer,
Includes defibrated fibers (A) obtained by defibrating a composite resin film having a low melting point resin layer, and fibers (B) made of a resin having a higher melting point than the polypropylene resin which is the main component of the high melting point resin layer. It is a composite fiber non-woven fabric.

The high melting point resin layer of the composite resin film, which is the material of the defiberized fiber (A), contains polypropylene resin as a main component. The polypropylene resin, which is the main component of the high melting point resin layer, is a homopolymer of propylene or a copolymer of propylene and another monomer copolymerizable with propylene. Examples of other monomers copolymerizable with propylene include α-olefins having 2 to 20 carbon atoms such as ethylene, butene-1, hexene-1, and octene-1.

Further, in the present invention, the high melting point resin layer may contain other resin components in addition to the polypropylene resin. Examples of the other resin component include polyethylene resin, polybutene-1 resin, polystyrene resin and the like. Among these, a high melting point resin layer containing a polypropylene resin as a main component and a polyethylene resin as another resin component is preferable because it has an effect of enhancing interlayer adhesion.

The polypropylene resin which is the main component of the high melting point resin layer preferably has an MFR of 0.5 to 10 g / 10 minutes, and particularly preferably 2 to 8 g / 10 minutes. In the present invention, the MFR (melt flow rate) is 230 ° C. according to JIS K6760.
It is measured by.

In the present invention, when the high melting point resin layer contains a polypropylene resin as a main component and a polyethylene resin as another resin component, MFR: 0.5 to 10 g / 10
70 to 95 parts by weight of polypropylene resin and MFR:
A combination of 30 to 5 parts by weight of a polyethylene resin of 0.5 to 20 g / 10 minutes is preferable from the viewpoint of having an effect of enhancing interlayer adhesion, and further MFR: 2 to 8 g /
95-80 parts by weight of polypropylene resin for 10 minutes and MF
R: 1.0 to 13 g / 10 min polyethylene resin 5-2
The combination of 0 parts by weight, in terms of compatibility,
Particularly preferred.

In the present invention, the low melting point resin layer of the composite resin film is mainly composed of a thermoplastic resin having a lower melting point than polypropylene resin. As a thermoplastic resin having a melting point lower than that of the polypropylene resin, for example, a polyethylene resin (linear low density polyethylene (LL
DPE), high pressure low density polyethylene (LDPE)),
Propylene-ethylene random copolymer and the like can be mentioned. In the present invention, as the low melting point resin layer, a resin containing polyethylene resin as a main component enhances melt fluidity,
Since it is a layer with excellent dimensional stability due to little heat shrinkage,
Particularly, a resin made of a combination of polyethylene resin and polypropylene resin is particularly preferable.

Further, in the present invention, when the low melting point resin layer is made of a combination of polyethylene resin and polypropylene resin, MFR: 0.5 to 20
70 to 95 parts by weight of a polyethylene resin of g / 10 minutes, and M
FR: 0.5 to 10 g / 10 min polypropylene resin 3
A combination of 0 to 5 parts by weight is preferable from the viewpoint of the effect of enhancing interlayer adhesion, and further, MFR: 1
A combination of 90 to 95 parts by weight of a polyethylene resin of 5 to 20 g / 10 minutes and 10 to 5 parts by weight of a polypropylene resin of MFR: 5 to 10 g / 10 minutes has higher interlayer adhesiveness and dimensional stability. In terms of being an excellent layer,
Particularly preferred.

In the present invention, the composite resin film, which is the material of the defibrated fiber (A), has a high melting point resin layer or MFR: 0.
It contains 70 to 95 parts by weight of a polypropylene resin of 5 to 10 g / 10 minutes and 5 to 30 parts by weight of a polyethylene resin of MFR: 0.5 to 20 g / 10 minutes. As a low melting point resin layer, MFR: 0 70 to 95 parts by weight of a polyethylene resin of 0.5 to 20 g / 10 minutes and MFR: 0.5 to 10 g
From the viewpoint of interlayer adhesiveness and dimensional stability, when it contains 5 to 30 parts by weight of a polypropylene resin of / 10 minutes,
preferable.

In this composite resin film, the thickness ratio of the high melting point resin layer and the low melting point resin layer is usually
It is formed at a ratio of 1: 2 to 1: 1. The thickness of the composite resin film is usually about 40 to 80 μm, preferably about 50 to 60 μm. In addition to the high melting point resin layer and the low melting point resin layer, other resin layers may be provided as necessary.

Further, in this composite resin film,
These high-melting point resin layer, low-melting point resin layer, and other resin layers formed as necessary, the pigment, depending on the purpose,
Dyes, lubricants, ultraviolet absorbers, flame retardants, hydrophilizing agents, inorganic fillers and the like may be contained within the range not impairing the object of the present invention.

The composite resin film can be prepared according to a conventional method and is not particularly limited. For example,
A composite resin having each layer of the high melting point resin layer, the low melting point resin layer, and, if necessary, another resin layer according to a melt extrusion method such as inflation extrusion molding, extrusion molding with a T die, a calendering method, a casting method, and the like. A film can be produced. In particular, in inflation extrusion molding or extrusion molding using a T-die, resin raw materials for forming the high-melting point resin layer, the low-melting point resin layer, and other resin layers that are formed as necessary are provided in different extruders. , Melt-kneading, and the melt is merged from each extruder to perform co-extrusion or drawing from an annular die or a T-die of an inflation molding machine.
A composite resin film having the required layer structure can be obtained.

In the step of producing the defibrated fiber (A) from the composite resin film, the composite resin film is slit and then stretched, or stretched and then slit and processed to form a stretched tape. After that, it is the step of defibrating.

Slit processing is a process of cutting a film into a thin strip by a device such as a cutter.

Stretching can be carried out by a conventional method such as a method using a nip roll or a clover roll, or a continuous stretching method using an air oven, a hot plate or the like. This stretching is usually 90% in the case of stretching using a hot plate.
It is carried out at a temperature of about 120 ° C. and a draw ratio of about 6 to 8 times.

In the present invention, the drawn tape obtained by drawing and slitting is defibrated to be formed into defibrated fibers (A) having a fine mesh structure. This defibration process can be performed by a pork pine machine having a pair of rolls in which needles are planted on the knife edge or the outer peripheral surface formed in a sawtooth shape. Further, the obtained defibrated fiber can be cut into a required length, if necessary.

The defibrated fiber (A) usually has a fineness of 50 to 6
A trunk fiber having a fineness of 0 d and a branch fiber having a fineness of 0.5 d or less. In addition, the defibrated fiber (A) has a trunk fiber and a branch fiber, and has a fibril structure having a fine mesh structure.

The dry nonwoven fabric of the present invention is the above-mentioned defiberized fiber (A).
And a fiber (B). This fiber (B) is made of a resin having a melting point higher than that of polypropylene resin, and examples thereof include those made of a resin such as polyester resin, polyamide resin, poly-4-methyl-1-pentene resin and the like. Among these, those made of polyester resin or polyamide resin are preferable.

As the polyamide resin, for example,
Examples thereof include nylon 6 and nylon 66.

The fineness of this fiber (B) is usually 2 to 10
It is about d, preferably about 3 to 4d.

The fiber (B) usually has a fineness of 4
d, fiber diameter 20 μm, and cut length of 51 mm. The fiber (B) may be a core-sheath type fiber.

In the dry nonwoven fabric of the present invention, the mixing ratio of the defibrated fibers (A) and the fibrils (B) is 40% defibrated fibers (A).
To 95 parts by weight of the fiber (B) 60 to 5 parts by weight, preferably 80 to 30 parts by weight of the defiberized fiber (B) 20 to 70 parts by weight, More preferably, the ratio is 30 to 60 parts by weight of the fiber (B) with respect to 70 to 40 parts by weight of the defibrated fiber (A). In particular, the defiberized fiber (A) 50 is used for applications such as packaging materials for products in which the surface of the heat-sealed portion does not have a film-like shape even after heat-sealing and the appearance is required to retain the fiber shape on the surface.
It is preferable that the ratio of the fiber (B) is 50 to 60 parts by weight with respect to the ratio of 40 to 40 parts by weight.

The dry non-woven fabric of the present invention usually has a basis weight of
It is about 10 to 150 g / m ² , and is preferably 10 to 5 in terms of cost and suitability for a wide range of applications.
It is about 0 g / m ² .

The dry nonwoven fabric of the present invention usually has a thickness of 0.
It is about 10 to 1.0 mm, and as a general-purpose product used in a wide range of applications, it is preferably about 0.15 to 0.40 mm, which is also advantageous from the viewpoint of cost.

The dry non-woven fabric of the present invention can be produced by a carding device by blending the disentangled fiber (A) and the fiber (B) in a predetermined ratio by a cotton blending machine to make the dispersion uniform. it can.

The dry non-woven fabric of the present invention is particularly effective for applications where relatively high rigidity is required because the defiberized fiber (A) has both stem fibers and branch fibers. In addition, for applications requiring flexibility, there is an advantage that desired flexibility can be obtained by adjusting the content of the fiber (B) made of a resin having a high melting point.

[0034]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples of the present invention. In the following examples and comparative examples, the thickness unevenness of the obtained dry nonwoven fabric,
The air permeability, the stiffness, the tear strength, the tensile strength, and the heat sealability were measured or evaluated according to the following methods according to JIS L1906.

Thickness Unevenness For a dry non-woven fabric sample with a width of 50 cm, 1 at 5 cm intervals.
In measuring points 0 points, using a thickness tester having a presser foot area 2 cm ² of 16mm diameter and contact surface, left to stand for 10 seconds to a thickness settles at a load 20 g / cm ^2, a thickness It was measured. The average value of the thickness measured at each measurement point is calculated, and the minimum and maximum values of the thickness measured at 10 measurement points are expressed as the range of thickness unevenness, and the variation is calculated according to the following formula. I asked. Variation = [(maximum value-minimum value) / average value] x 100

Air Permeability According to the method A (Frazier method), three test pieces of 15 cm × 15 cm are sampled for each dry non-woven fabric sample having a width of 50 cm. Using a Frazier type breathability tester, attach one test piece to the bottom surface of one end of the cylinder, and then use an adjustable resistor to draw in the inclined barometer so that it shows a pressure of 1.27 cm of water. Adjusted the suction force. From the pressure indicated by the vertical pressure gauge at that time and the type of air holes used, the amount of air (cm ³ / cm ² / s) passing through the test piece is determined from the attached table. The measurement is performed on three test pieces, and the average value is obtained and used as the measured value.

According to the stiffness B method (handle odometer method), a width of 50 c
Two 20 cm x 20 cm test pieces are taken from the dry nonwoven fabric sample of m. With a handle ometer type tester,
Place the test piece on the sample stand in the direction of the slot (width 2
(0 mm) and the test piece is placed so that the surface of the test piece serves as a measurement surface. Next, 8 mm from the sample table surface
The blade of the penetrator adjusted so as to go down is lowered to press the test piece. At this time, 6.7 cm from one side of the test piece (1 / cm from the end of the test piece)
3), the maximum value (g) of the measured values measured at the vertical and horizontal positions. In this test, the average value of the measured values of two test pieces is obtained.

Tear strength According to method A (single tack method), 5c was obtained from each of the longitudinal and transverse directions of the dry non-woven fabric sample having a width of 50 cm.
Three m × 20 cm test pieces are collected. A 10 cm cut is made at the center of the short side of the test piece at right angles to the side to form a strip having two tongue pieces. This test piece is sandwiched at right angles to the clamp with a gripping interval of 10 cm using a constant-speed extension type tensile tester, and the maximum load shown when tearing at a tearing speed of 20 ± 2 cm / min is measured. In this test, the average value of the measured values obtained for each of the vertical and horizontal test pieces is obtained.

Tensile Strength Three 5 cm × 20 cm test pieces are taken from each of the longitudinal and transverse directions of a dry non-woven fabric sample having a width of 50 cm. The test piece was attached using a constant-speed extension type tensile tester with a grip interval of 10 cm, and a pulling speed of 20 ± 2 cm.
Pull until cut at / min and measure strength and elongation at maximum load. In this test, the average value of the measured values obtained for each of the vertical and horizontal test pieces is obtained.

Heat Seal Test Two 20 cm × 20 cm test pieces are taken from each of the longitudinal and transverse directions of the dry non-woven fabric sample having a width of 50 cm. Stack two test pieces taken from the same direction,
Heat sealing is performed with a heat sealing machine manufactured by Fuji Impulse Co., Ltd. at a heat sealing width of 5 mm, a pressure of 1 kg / cm ² , a surface temperature of the seal bar: 130 ° C., and a sealing time of 0.5 seconds. Three tensile test pieces each having a width of 15 mm are taken in the longitudinal and transverse directions. This tensile test piece was peeled off by 180 degrees at a gripping interval of 10 cm and a pulling speed of 10 ± 1 cm / min using a constant-speed extension type tensile tester, and the maximum load when the test piece was broken was measured and obtained. Obtain the average of the measured values. Further, the cut state of the heat-sealed portion is visually observed.

(Example 1) Polypropylene resin (MF
R: 2.7 g / 10 minutes) and polyethylene resin (MF
R: 28 g / 10 min) are supplied to separate extruders, respectively, and melt-kneaded, respectively, and co-extruded from an annular die of an inflation film molding machine to form an inflation film, and a high-melting resin layer made of polypropylene resin ( A composite resin film having a three-layer structure having a thickness of 40 μm) and two low melting point resin layers of polyethylene resin (thickness: both inner and outer layers are 20 μm) was produced.

The obtained composite resin film is 300 m wide.
m was slit, drawn at a draw ratio of 7.5 times, and further defibrated using pork pine. Next, the defibrated fibers were cut into a length of 40 mm. Furthermore, this defibered fiber 16
0 g and 40 g of fibers (fiber diameter: 20 μm, 4 d, length: cut into 51 mm) made of polyester resin (melting point: 235 ° C.) were mixed, and the obtained fiber mixture was placed on a carding machine to produce a dry non-woven fabric. Was manufactured. With respect to this dry nonwoven fabric, the thickness unevenness, air permeability, stiffness, tear strength, tensile strength, and heat sealability were measured or evaluated. The results are shown in Table 1. As a result, the obtained dry non-woven fabric had a basis weight of 21 g / m ² , a thickness of 0.27 mm, and a variation in thickness of 11%, and showed a state in which fibers could be cut off during heat sealing. No seal marks were formed on the surface, and it had a good appearance.

Example 2 Defiberized fiber 1 obtained in Example 1
00 g and 100 g of fibers (fiber diameter: 20 μm, 4d, length: cut into 51 mm) made of polyester resin (melting point: 235 ° C.) are mixed to produce a dry non-woven fabric by a carding machine, Air permeability, stiffness, tear strength, tensile strength, and heat sealability were measured or evaluated. The results are shown in Table 1. As a result, the dry non-woven fabric obtained had a basis weight of 22 g / m ² and a thickness of 0.30.
The variation in mm and the thickness was 13%, and the fibers were in a state of falling out during heat-sealing, and no seal mark was formed on the heat-sealing portion, which had a good appearance.

Comparative Example 1 Only the defibrated fiber obtained in Example 1 was placed on a carding machine to produce a dry non-woven fabric having a thickness of 0.20 mm. The obtained dry nonwoven fabric was measured or evaluated for unevenness in thickness, air permeability, stiffness, tear strength, tensile strength, and heat sealability. The results are shown in Table 1.
Shown in As a result, the obtained dry non-woven fabric has a basis weight of 24
g / m ² , thickness 0.20 mm, and variation in thickness were 100%, and seal breakage occurred during heat sealing, and the appearance was not good.

(Comparative Example 2) Defiberized fiber 1 obtained in Example 1
60 g and 40 g of fibers made of polypropylene resin (melting point: 158 ° C.) were mixed and placed in a carding machine to produce a dry non-woven fabric with a defiberized fiber / polypropylene resin fiber mixing ratio of 8/2. The obtained dry nonwoven fabric was measured or evaluated for unevenness in thickness, air permeability, stiffness, tear strength, tensile strength, and heat sealability. The results are shown in Table 1. As a result, the obtained dry non-woven fabric has a basis weight of 2
The thickness was 0 g / m ² , the thickness was 0.23 mm, and the variation in the thickness was 82%, and the seal was broken during heat-sealing, and the appearance was not good.

(Comparative Example 3) Defiberized fiber 1 obtained in Example 1
00 g and 100 g of fibers made of polypropylene resin (melting point: 158 ° C.) were mixed and placed in a carding machine to produce a dry nonwoven fabric having a defiberized fiber / polypropylene resin fiber mixing ratio of 5/5. About the obtained dry nonwoven fabric, uneven thickness, air permeability, stiffness, tear strength, tensile strength,
And the heat sealability was measured or evaluated. The results are shown in Table 1. As a result, the obtained dry non-woven fabric has a basis weight of 20 g / m ² , a thickness of 0.27 mm, and a thickness variation of 26%, and has a good appearance due to breakage of the seal during heat sealing. It wasn't something.

[0047]

[Table 1]

As described above, the dry non-woven fabrics obtained in Examples 1 and 2 have little unevenness in thickness and thickness, are bulky, and do not form a film in the heat-sealed portion, maintain the fiber layer, and show a good appearance. Met. On the other hand, Comparative Example 1
The dry non-woven fabric obtained in Example 1 had large unevenness in thickness and thickness.
Alternatively, the dry non-woven fabric obtained in 2 had a smaller thickness even with the same basis weight, and the heat-sealed portion was considerably formed into a film. In addition, the dry non-woven fabric obtained in Comparative Example 2 is considerably improved in thickness unevenness as compared with Comparative Example 1.
Although the thickness was increased, the heat-sealed portion was formed into a film. Further, in the dry non-woven fabric obtained in Comparative Example 3, the thickness unevenness was improved and the thickness was increased, but the heat-sealed portion was formed into a film. The states of the heat-sealed portion in these Example 2 and Comparative Examples 1 to 3 are shown in FIGS. FIG. 1 is a photograph of the heat-sealed portion of the dry non-woven fabric obtained in Example 2, and shows that the heat-sealed portion is not formed into a film. Figure 2
Is a photograph of the heat-sealed portion of the dry non-woven fabric obtained in Comparative Example 1, and shows that the heat-sealed portion is considerably formed into a film. FIG. 3 is a photograph of the heat-sealed portion of the dry non-woven fabric obtained in Comparative Example 2, and shows that the heat-sealed portion is formed into a film. Further, FIG. 4 is a photograph of the heat-sealed portion of the dry non-woven fabric obtained in Comparative Example 3, and shows that the heat-sealed portion is formed into a film.

[0049]

EFFECTS OF THE INVENTION The dry non-woven fabric of the present invention does not reduce homogeneity and does not cause unevenness in thickness even if the basis weight is small, and no seal mark is formed at the time of heat sealing, so that the heat seal portion has a fiber layer. Can be maintained. Therefore, the dry non-woven fabric of the present invention, a desiccant, insect repellent, dehumidifying agent, rust preventive, packaging bags for bath agents, soup bags, bags for packaging alcoholic beverages, or various packaging bags such as clothing covers, etc. It is useful as various packaging materials.

Further, the method of the present invention has great practical utility value as a method for producing this dry nonwoven fabric.

[Brief description of drawings]

FIG. 1 is a photograph of a heat-sealed portion in a heat-sealing test of a dry nonwoven fabric obtained in Example 2.

FIG. 2 is a photograph of a heat-sealed portion of a dry nonwoven fabric obtained in Comparative Example 1 in a heat-sealing test.

FIG. 3 is a photograph of a heat-sealed portion of a dry nonwoven fabric obtained in Comparative Example 2 in a heat-sealing test.

FIG. 4 is a photograph of a heat-sealed portion of a dry nonwoven fabric obtained in Comparative Example 3 in a heat-sealing test.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location D04H 1/54 D04H 1/54 C

Claims (7)

[Claims] 1. A defibrated composite resin film having a high melting point resin layer containing a polypropylene resin as a main component and a low melting point resin layer containing a thermoplastic resin having a melting point lower than that of the polypropylene resin as a main component. A dry non-woven fabric containing 40 to 95 parts by weight of defibrated fiber (A) and 60 to 5 parts by weight of fiber (B) made of a resin having a melting point higher than that of polypropylene resin. 2. The dry non-woven fabric according to claim 1, wherein the low melting point thermoplastic resin is a resin containing polyethylene as a main component. 3. The dry non-woven fabric according to claim 1, wherein the fiber (B) is a fiber made of at least one resin selected from polyester resins and polyamide resins. 4. The high melting point resin layer has an MFR of 0.5 to 1.
The dry non-woven fabric according to any one of claims 1 to 3, which comprises 70 to 95 parts by weight of a polypropylene resin of 0 g / 10 minutes and 5 to 30 parts by weight of a polyethylene resin of MFR: 0.5 to 20 g / 10 minutes. 5. The low melting point resin layer has an MFR of 0.5-2.
70 to 95 parts by weight of a polyethylene resin of 0 g / 10 minutes,
The dry non-woven fabric according to any one of claims 1 to 4, comprising MFR: 0.5 to 10 g / 10 min and 5 to 30 parts by weight of a polypropylene resin. 6. The dry non-woven fabric according to claim 1, which has a basis weight of 10 to 150 g / m ² . 7. A composite resin film having a high melting point resin layer containing a polypropylene resin as a main component and a low melting point resin layer containing a thermoplastic resin having a melting point lower than that of the polypropylene resin as a main component is defibrated and unwound. A method for producing a dry non-woven fabric, which comprises a step of preparing the fiber (A), and a step of forming the non-woven fabric by mixing the defiberized fiber and the fiber (B) made of a resin having a melting point higher than that of the polypropylene resin.