JP2003180748A - Target tape made of non-woven fabric and absorbent article using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a target tape made of a non-woven fabric which has increased peeling strength in separating a hook member of a hook/loop fastener as a fastening tape and prevents reduction of the peeling strength after repeated attachments and detachments, and an absorbent article using the target tape made of the non-woven fabric. <P>SOLUTION: The target tape 19 made of the non-woven fabric engages the hook member of the hook/loop fastener as the fastening tape 17 secured to the absorbent article. The target tape 19 made of the non-woven fabric is an air-through non-woven fabric formed by interweaving heat adhesive short fibers in high density and by bonding them thermally through blowing air of high temperature against webs made of many heat adhesive short fibers. The basis weight of the non-woven fabric is 17-50 g/m<SP>2</SP>. The fineness of the short fiber of the non-woven fabric is 0.5-8 denier. The absorbent article uses the target tape made of the non-woven fabric. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a non-woven target tape and an absorbent article using the same.

[0002]

2. Description of the Related Art As shown in FIG. 1, a disposable diaper as an absorbent article currently on the market is provided with a liquid-permeable top sheet 3 and a liquid-impermeable back sheet 5, and between them. The diaper body 1 has a substantially three-layer structure in which a liquid-retaining absorber (not shown) to be interposed is laminated. The diaper body 1 is roughly divided into a front body 11 that is applied to the abdomen of the user and a back body 13 that is applied to the back when the user wears it. The both sides of the rear body 13 are provided with a pair of left and right side flaps 15 extending laterally from this. Then, after the side flaps 15 are wrapped around the user's body from the armpit to the abdomen, the topsheet surface of the tip end of the side flap 15 is fixed to the backsheet surface of the front body 11, It is designed to fix disposable diapers to the body.

The fastening is a hook-and-loop fastener member as a fastening tape 17 attached to the tip of the side flap 15 and a hook-and-loop fastener as a target tape 19 attached to the back sheet surface of the front body 11. It is performed by engaging with a member. Recently, spunbonded non-woven fabric has been applied to the target tape 19 instead of the surface fastener loop member to reduce the cost.

[0004]

However, since this spunbonded nonwoven fabric is formed by depositing and collecting long fibers formed by spinning melted fibers at high speed, the long fibers form a large number of loops. Not as entangled as much. Therefore, the fastening tape 1 is attached to the target tape 19.
Even when trying to engage 7, the hooks of the fastening tape 17 are difficult to engage with the loops due to the entanglement because there are few loops due to the entanglement of the long fibers in the target tape. Therefore, the peel strength of the spunbonded non-woven target tape 19 from the fastening tape 17 is low,
It is difficult to withstand the use of disposable diapers for infants with low required peel strength.

In addition, it is usually difficult to put on the diaper exactly with one fastening operation, and in practice, the fastening tape 17 and the target tape 19 are fastened and unfastened so that the diaper can be tightened just right. Wearing a diaper while repeating it several times. However, when this fastening and detaching is repeated, the non-woven fiber of the target tape 19 is broken or the entanglement is dislodged, so that the peeling strength is further reduced after the fastening and detaching, and the required peeling strength is achieved after the attachment. It was even more difficult.

The present invention has been made in view of the above-mentioned conventional problems, and increases the peeling strength from a hook-and-loop fastener hook member as a fastening tape and suppresses the decrease in the peeling strength after repeated stop and attachment. An object of the present invention is to provide a non-woven target tape and an absorbent article using the same.

[0007]

In order to achieve such an object, the invention as set forth in claim 1 is a non-woven target tape which is engaged with a hook-and-loop fastener hook member, wherein the non-woven target tape comprises a large number of heats. A web made of fusible short fibers is blown with high temperature air to entangle the fibers with each other at a high density and heat-bonded to each other, and the basis weight of the non-woven fabric is 17 to 50 g / m ² . The fineness of the short fibers of the non-woven fabric is 0.5 to 8 denier.

The invention described in claim 2 is the non-woven target tape of the absorbent article according to claim 1, wherein:
30 to 70% by weight of the non-woven fabric is composed of short fibers having a fineness of 4 to 8 denier, and the rest is composed of short fibers having a fineness of 0.5 to 3 denier.

According to a third aspect of the present invention, in the nonwoven fabric target tape of the absorbent article according to the first or second aspect, the high temperature air temperature is the outer surface temperature of the heat fusible short fibers. The temperature is 105% or more of the melting point of the fiber.

The invention as set forth in claim 4 is the non-woven target tape for an absorbent article as set forth in claim 1 or 2, wherein the heat-fusible short fibers have a high melting point in a sheath material having a low melting point. Is a sheath core structure including the core material, and the high-temperature air temperature is such that the outer surface temperature of the sheath material is 10
It is characterized in that the temperature is a melting point of the core material or less at 5% or more.

According to a fifth aspect of the present invention, in the non-woven target tape of the absorbent article according to any of the first to fourth aspects, the heat-fusible short fibers are a thermoplastic resin and the heat-meltable short fibers are The attached air-through nonwoven fabric is characterized in that it is heated on the surfaces of a pair of rotating leveling rollers.

According to a sixth aspect of the present invention, in the non-woven target tape of the absorbent article according to the fifth aspect, the surface temperature of the leveling roller is equal to or higher than the melting point of the heat-fusible short fibers. And

According to a seventh aspect of the present invention, in the nonwoven fabric target tape of the absorbent article according to any of the first to sixth aspects, the heat-fusible short fibers are a thermoplastic resin and the heat-meltable short fibers are the same. The attached air-through non-woven fabric is characterized in that when the temperature of the non-woven fabric is in the temperature range of 50 ° C. or higher and below the melting point of the heat-fusible short fibers, it is narrowed by a pair of rotating embossing rollers.

The invention described in claim 8 is an absorbent article, characterized by using the non-woven target tape according to any one of claims 1 to 7.

According to a ninth aspect of the present invention, in the absorbent article according to the eighth aspect, the non-woven target tape is formed wider than the absorbent body and over the entire length in the longitudinal direction of the absorbent article. It is arranged and used as the outermost sheet on the back surface side of the absorbent article.

[0016]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the appearance of a disposable diaper as an absorbent article to which the non-woven target tape 19 according to this embodiment is attached.

This disposable diaper is mainly for infants, and has a liquid-permeable top sheet 3, a liquid-impermeable back sheet 5, and a liquid-retaining absorbent body (not shown) interposed therebetween. The diaper body 1 has a substantially three-layer structure in which and are laminated. The diaper body 1 is roughly divided into a front body 11 that is applied to the abdomen of the user when worn by the user and a back body 13 that is applied to the back. The both sides of the rear body 13 are provided with a pair of left and right side flaps 15 extending laterally from this. Then, after the side flaps 15 are wrapped around the user's body from the armpit to the abdomen, the topsheet surface of the tip end of the side flap 15 is fixed to the backsheet surface of the front body 11, It is designed to fix disposable diapers to the body.

The non-woven target tape 19 according to the present embodiment is used for this fastening. The non-woven target tape 19 is affixed to the back sheet surface of the front body 11, and the tip end of the side flap 15 is provided. The side flaps 15 are fixed to the front body 11 by engaging with a hook-and-loop fastener hook member as the fastening tape 17 attached to the portion.

The non-woven target tape 19 is a rectangular sheet member, and is adhered to the upper portion of the back sheet surface of the front body 11 over its entire width by a hot melt adhesive. Then, in the present invention, the target tape 19 is made of an air-through nonwoven fabric.

FIG. 2 is a conceptual view of a side sectional view in the manufacturing process of this air-through nonwoven fabric. First, short fibers of thermoplastic resin such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) are randomly selected. The oriented web 31 having a predetermined basis weight is formed, the web 31 is continuously placed on the conveyor 41, and the dryer 4 is placed on the web 31 while the conveyor is being conveyed.
In 3, the high temperature air is blown to heat-bond the short fibers together. Then, the non-woven fabric 31a delivered from the dryer 43 is wound into a roll by the winder 57 downstream of the dryer.

The dryer 43 has a doorway 43 at the front and rear.
The web 31 is carried by the conveyor 41 in the tunnel provided with a and 43b. The hot air supply duct 45 is provided on the lower surface of the ceiling of the tunnel, while the hot air suction duct 47 is provided on the bottom surface of the tunnel below the conveyor 41. Then, while the web 31 enters from the inlet 43a of the dryer 43 and exits from the outlet 43b, high-temperature air is blown to the web 31 to randomly orient the heat-fusible short fibers, The short fibers are heat-sealed to each other so that the outer peripheral surface temperature becomes a predetermined temperature described later.

The air-through non-woven fabric thus formed is
The short fibers constituting the non-woven fabric are entangled with each other at a high density by heat fusion in a random orientation to each other, and a large number of short fiber gaps between the short fibers are provided, and the short fiber gaps serve as the loops. Function. Therefore, when the hook member is engaged with the target tape of the air-through nonwoven fabric, there are many loops with which the hook of the hook member can be engaged, and thus the target tape has a large peeling strength from the fastening tape. can do. Further, since the loop is formed by heat fusion of short fibers,
Its strength is high, and the target tape itself has high durability.

The predetermined basis weight is preferably 17 to 50 g / m ² . The adjustment of the basis weight can be easily performed by adjusting the web thickness. When the basis weight is 17 g / m ² or more, the target tape made of the air non-woven fabric has a thickness sufficient to accommodate the post-mentioned hooks of the fastening tape over its entire height. Therefore, the hook can be firmly engaged with the gap between the short fibers of the nonwoven fabric, and as a result, the peel strength between the fastening tape and the target tape can be improved. Further, if the basis weight is 50 g / m ² or less, it is possible to suppress the manufacturing cost while surely expressing the peel strength. In addition, it is possible to suppress the stiffness of the portion where the target tape is attached on the back sheet surface to be small, and to improve the wearing feeling of the disposable diaper.

The short fibers have a fineness of 0.5 to
It is preferably 8 denier, and more preferably at least 30 to 70% by weight of the constituent fibers of the short fibers.
Is preferably composed of fibers having a fineness of 4 to 8 denier, while the rest is composed of fibers having a fineness of 0.5 to 3 denier. And according to this structure, high tensile strength is expressed.
Since it contains 30 to 70% by weight or more of the fiber having a denier of 8 to 8, the tensile strength of the heat-fusible short fiber itself can be set to a strength sufficient to achieve the peel strength, while the rest is 0. Since the fiber has a denier of 5 to 3 denier, interstices of a predetermined size can be formed for the hook to enter, and the hook can be firmly engaged with these interstices. The fiber length of the short fibers is preferably 10 to 70 mm, more preferably 30 to 55 mm.

The high temperature air temperature is preferably such that the outer surface temperature of the short fibers is 105% or more of the melting point (Celsius) of the short fibers. The outer surface temperature of the short fibers is measured by the radiation thermometer 4 provided at the dryer outlet 43a.
4 is detected. Then, according to the detected temperature, the high temperature air temperature (° C.) blown by the dryer 43, the air flow rate (m ³ / min), the conveyer speed in the dryer 43 (m / min), etc. are adjusted. Thus, the outer surface temperature of the short fibers at the dryer outlet 43b can be easily set within the range.

Since the outer surface temperature is set to a high value such as 105% or more of the melting point of the short fibers, there are many fusion sites on the outer surface of each short fiber when the high temperature air is blown. On the other hand, the fusion amount at each site also increases, and the fibers are strongly entangled. Therefore, as a result of the entanglement becoming difficult to disengage, the strength of the loop, which is the inter-fiber gap based on the entanglement, also increases, and it is possible to suppress a decrease in peel strength after the repeated stop and attachment.

The types of the short fibers are PE, PP and P.
Single short fibers of a thermoplastic resin such as ET may be used, but desirably, a low melting point sheath material 2 as shown in the transverse sectional view in FIG.
It is preferable to have a sheath-core structure in which a core material 23 having a high melting point is provided inside 1. As the combination of sheath material / core material, for example, PE /
Examples include PP and PE / PET. When the short fibers having the sheath-core structure are used, the outer surface temperature of the short fibers when the high temperature air is blown is 105
%, And the melting point of the core material is 23 or less. For example, if the sheath / core material combination is PE / PP, the lower limit temperature of the outer surface of the short fibers is P, which is a low melting point.
The melting point of E is 137 ° C., which is 105% of 130 ° C., and the upper limit temperature is 140 ° C. based on the melting point of PP, which is a high melting point. In the case of PE / PET, the lower limit temperature is set to 137 ° C. as described above, and the upper limit temperature is set to 220 ° C. based on the melting point of PP, which has a high melting point.

In this way, the short fibers have a sheath-core structure in which the high-melting core material 23 is provided in the low-melting-point sheath material 21, and the outer surface temperature at the time of blowing the high temperature air is high-melting core. Since the melting point of the material 23 is set to be equal to or lower than the melting point of the material 23, it is possible to prevent the core material 23 from being melted and the fiber shape such as the fiber length from being largely broken. Therefore, the desired fiber shape can be substantially maintained, a loop as a gap between the short fibers for the hook to enter can be secured, and the fastening tape and the target tape can be reliably engaged.

When the high temperature air is blown to heat-bond the short fibers, the short fibers on the surface of the non-woven fabric are deformed and fluffed by the high temperature air. Then, in this state, the appearance is very poor, and the distribution density of the short fibers becomes small due to the fluffing, and the peeling strength from the fastening tape decreases.

Therefore, it is desirable that a pair of rotating leveling rollers 5 be provided between the dryer 43 and the winder 57, as shown in FIG.
5, the nonwoven fabric 3 discharged from the dryer 43
1a is wound around the pair of leveling rollers in an S-shape, while the nonwoven fabric 3 is discharged from the leveling roller 55.
A deflector roll 56 may be arranged between the leveling roller 55 and the winder 57 in order to direct the 1b towards the winder 57. Further, the heat-bonded air-through non-woven fabric 31a is further treated by the dryer 43.
Immediately after, while the temperature of the nonwoven fabric is still high, for example, when the temperature of the nonwoven fabric is in the temperature range of 50 ° C. or higher and the melting point of the outer surface portion of the heat-fusible short fiber, the pressing force is applied by the leveling roller 55. Is preferably given.

The pair of leveling rollers 55 are cast steel cylindrical rollers having a smooth surface on both rollers 55a and 55b, and the upper roller 55a is a lower roller so that an appropriate pressing force can be applied to the nonwoven fabric 31a. It can be moved up and down with respect to 55b. And the upper roller 55
By using a hydraulic jack (not shown) equipped with a load cell that can lift and lower a, it is possible to adjust the pressing force of the upper roller 55a and the lower roller 55b against the non-woven fabric to adjust the leveling amount of the short fibers to a desired value. Has become. In addition, by adjusting the temperature of the non-woven fabric 31a when applying the pressing force,
The leveling amount may be adjusted. Further, it is desirable that the roller rotation speed (m / min) be synchronized with the winder 57 located downstream of the leveling roller 55.

According to the leveling roller 55,
The fluff can be smoothed by pressing the short fibers in the temperature range where the short fibers of the thermoplastic resin are softened. Therefore, the appearance of the target tape can be made beautiful, the surface can be made smooth, and the texture can be improved. Further, by reducing the initial fluff, the short fibers can be brought into close contact with each other, and the short fibers that can contribute to the engagement with the hook can be increased. Therefore, it is possible to reduce the fluff caused by the repeated stop and attachment with the fastening tape, and suppress the decrease in the peeling strength due to the repeated stop and attachment.

It is desirable to provide a heating means 53 for heating the surface of at least one of the upper and lower rollers 55a and 55b. This heating means 53 is a roller 5
5a and 55b are heated substantially uniformly in the width direction, and an infrared heater that radiates infrared rays to apply heat, an induction heating device that generates heat by an induction current, or the like can be applied. Then, based on the detection temperature from the temperature detection means such as a thermocouple for measuring the roller surface temperature, the infrared ray amount or the induced current amount is appropriately adjusted,
The roller surface temperature is adjusted to a desired value.

By using this heating means 53, the roller surface temperature can be raised to an arbitrary value as required. Therefore, the heat-bonded short fibers of the air-through nonwoven fabric can be heated and softened by the leveling roller 55, and at the same time, the softened short fibers can be pressed by the leveling roller 55 to level the fluffing. . Therefore,
Even in the case of an air-through non-woven fabric in which short fibers have been temperature-cured and hardened after a long time has passed since the heat fusion due to the blowing of the high-temperature air, fluffing can be reduced, so the leveling roller 55 is arranged immediately after the dryer 43. There is no need to do so, and the degree of freedom in equipment arrangement can be increased.

Here, desirably, the roller surface temperature is set to be equal to or higher than the melting point of the outer surface portion of the heat-fusible short fiber. For example, in the case of a short fiber having a sheath-core structure such as PE / PP, the melting point of the sheath material is set to 130 ° C. or higher. By doing so, the short fibers can be surely softened, and thus the fluffing of the short fibers can be surely reduced.

Here, in order to further reduce the fuzz, as shown in FIG. 2, the deflector roll 5 is used.
It is advisable to additionally install the embossing roller 51 between the 6 and the winder 57. And the air-through nonwoven fabric 31b
Immediately after being heated by the leveling roller 55, while the temperature of the non-woven fabric is still high, for example, the temperature of the non-woven fabric is in the temperature range of 50 ° C. or higher and the melting point or less of the outer surface of the heat-fusible short fiber. At some time, it is preferable that the embossing roller 51 applies a narrow pressure.

The embossing roller 51 is a cylindrical roller made of cast steel having a smooth surface for both the upper and lower rollers, and a hydraulic jack (not shown) equipped with a load cell for supporting the lower roller so that the lower roller can be moved up and down is used to open or lower the load between the upper and lower rollers. Can be adjusted. Then, the reduction amount (mm), the reduction rate (%), the reduction load (kN), or the linear pressure (kN / m), which is the reduction load per unit width of the air-through nonwoven fabric, is adjusted as appropriate to smooth the short fibers. Adjust the amount to the desired value. Here, the rolling reduction (%) is
The difference between the thickness of the air-through nonwoven fabric 31b on the entry side of the embossing roller 51 and the thickness of the air-through nonwoven fabric 31c on the exit side is divided by the thickness of the air-through nonwoven fabric 31b on the entry side and expressed as a percentage. The leveling amount may be adjusted by adjusting the temperature of the non-woven fabric when applying the reduction. Further, it is desirable that the roller rotation speed (m / min) be synchronized with the winder 57 located downstream of the emboss roller 51.

According to the embossing roller 51, it is possible to narrow the short fibers of the thermoplastic resin in the temperature range in which the short fibers are softened and smooth the fluff. Therefore, the appearance of the target tape can be made beautiful. Further, by reducing the initial fluff, the short fibers can be brought into close contact with each other, and the short fibers that can contribute to the engagement with the hook can be increased. Therefore, it is possible to reduce the fluff caused by the repeated stop and attachment with the fastening tape, and suppress the decrease in the peeling strength due to the repeated stop and attachment.

The embossing roller 51 preferably includes the heating means 53 for heating the surface of at least one of the upper and lower rollers. still,
Since the structure of the heating means 53 is the same as that described above, its explanation is omitted here.

By using the heating means 53, the roller surface temperature can be raised to an arbitrary value as required. Therefore, the short fibers of the heat-sealed air-through nonwoven fabric can be heated and softened by the embossing roller 51, and at the same time, the softening short fibers can be narrowed by the embossing roller 51 to smooth the fluff. Therefore, even in the case of an air-through nonwoven fabric in which short fibers have been temperature-cured and hardened after a long time has passed since the heat fusion due to the blowing of the high-temperature air, fluffing can be reduced, so that the embossing roller 51 is provided immediately after the dryer 43. There is no need to arrange the equipment, and the flexibility of equipment arrangement can be increased.

Here, desirably, the roller surface temperature is set to be equal to or higher than the melting point of the outer surface portion of the heat-fusible short fiber. For example, in the case of a short fiber having a sheath-core structure such as PE / PP, the melting point of the sheath material is set to 130 ° C. or higher. By doing so, the short fibers can be surely softened, and thus the fluffing of the short fibers can be surely reduced.

A large number of convex portions as embossed patterns are provided on the roller surface of at least one side of the embossing roller 51. The convex shape is preferably a hemispherical dome shape or a rectangular parallelepiped shape, and its height is 3 to 30.
(Mm) and the width is preferably 3 to 30 (mm). And
According to this, the short fibers of the non-woven fabric are locally pressure-bonded in the embossed pattern. Therefore, it is possible to restrain the crimping portion and the short fibers around the crimping portion and further suppress the fluffing of the short fibers.

The air-through nonwoven fabric produced in this manner is cut into the predetermined rectangular shape, and then bonded as a nonwoven fabric target tape 19 to the back sheet surface of the front body 11 as shown in FIG. It This sticking is performed with a hot melt adhesive applied over the entire surface of the target tape 19. Slot coating is desirable for this hot melt coating method.

The optimum amount of paste of this hot melt adhesive is the target tape without the embossed pattern,
In the case the basis weight of the air-through nonwoven fabric of 17 g / ^{m 2,} it is desirable to uniformly apply to enter the range of 4~10g / ^{m 2,} when the basis weight of the nonwoven fabric is 50 g / ^{m 2} is , 5 to 15 g / m ² is desirable. Further, in the case of the target tape having the embossed pattern, when the basis weight of the nonwoven fabric is 17 g / m ² , it is 3 to 8 g / m.
^It is desirable to be in the range of ² , and the basis weight of the nonwoven fabric is 50.
In the case of g / ^{m 2} in the range of 4~10g / ^{m 2} it is desirable.

When applied with the amount of glue above the respective upper limit values, a large amount of the adhesive enters between the short fiber gaps of the non-woven fabric and closes the interfiber gaps, and the loop of the interfiber gaps is hooked with the fastening tape. As a result, the peeling strength between the fastening tape and the target tape is reduced. Further, if the amount of glue is less than the lower limit value, the adhesive strength between the backsheet surface and the target tape cannot be sufficiently secured. The nonwoven fabric used for the backsheet is not particularly limited, and known nonwoven fabrics such as spunbond can be used.

In the above embodiment, the target tape 19 is attached only to the back sheet surface of the front body 11, but the present invention is not limited to this. For example, the target tape 19 is arranged on the back sheet surface over the entire length in the longitudinal direction of the disposable diaper while being wider than the width of the absorber, that is, the target tape 19 is arranged from the front body 11 to the back body 13, You may use it as a side outermost layer sheet (not shown). Further, the target tape may be used as a back sheet.

The air-through non-woven target tape having such specifications shows the best performance for the following fastening tapes. This fastening tape is a hook-and-loop fastener member made of a resin material such as nylon, PE, or PP. As shown in the side view and the top view of FIG. 4, a large number of mushroom-shaped hooks 63 are provided on its surface 61. It is raised. This mushroom type hook 63
Is a base portion 6 standing upright from the hook member surface 61.
5 and an elliptical umbrella 67 extending from the upper end of the base. This hook has a height of 200-700
(Μm), the outer diameter of the lower end of the base is 150 to 400 (μm), the outer diameter of the upper end of the base is 100 to 300 (μm), the major axis of the wide umbrella is 200 to 650 (μm), and the minor axis of the umbrella is 200 to 550.
(Μm). With this size, when engaging with the air-through nonwoven fabric target tape having the basis weight range, the entire height of the hook 63 is completely accommodated in the target tape and enters the inter-fiber gap, and each hook 63 has many Since it engages with the short fibers, the peel strength can be increased. The distribution density of hooks is 50 to 400 (p
cs / cm ² ) is desirable, and within this range, the shear strength (N / cm ² ) and the peel strength (N / cm), which are the peel strengths, are the required shear strengths required for disposable diapers for infants. (3.0 (N / cm ² )) and required peel strength (0.5 (N / cm)) or more. As the hook, a normal fishing hook type or T
The type can also be suitably used within the range of the above dimensions,
Its peel strength is slightly lower than that of the mushroom type.

[0048]

EXAMPLES The effects of the present invention will be described below with reference to examples. In the table, the production specifications of an example of an air-through nonwoven fabric target tape made of short fibers having a PE / PET sheath-core structure, and the peel strength and the amount of fuzz as evaluations are compared with the nonwoven fabric target tape of Comparative Example. Indicate. The peel strength in the table is evaluated by the shear strength (N / cm ² ) and 90 ° continuous peel strength (N / cm) measured by the following methods. Further, MD described below means a machine direction, and CD means a cross dorection orthogonal to the MD.

(1) Procedure for measuring shear strength In a size of 40 mm (MD) × 100 mm (CD),
The target tape 19 whose shear strength is to be measured is cut. A fastening tape simulation member 71 as shown in the side view and the plan view of FIG. 5 is prepared. This fastening tape simulation member 71 is 100 mm (CD) x 25 mm
2 in one end portion in the longitudinal direction of the non-woven fabric base material 71a of (MD)
A 5 mm (MD) x 24 mm (CD) surface fastener hook member 73 is attached and formed. Next, the surface fastener hook member 73 is allowed to stand still on the target tape 19 while aligning the CD directions with each other, and a 2 kg roller is reciprocated once on the hook member 73,
The hook member 73 is fixed to the target tape 19. Then, as shown in the perspective view of FIG. 6, one end portion of the target tape 19 and the other end portion of the fastening tape simulating member 71 are gripped by a tensile tester 81 and pulled in the shearing direction, and the hook member 73 is the target tape. The load when peeling from 19 is measured. The shear strength is a value obtained by dividing the maximum value by the fastening area (area of the hook member 73). The pulling speed is 300 mm / min.

(2) Procedure for measuring 90 ° continuous peel strength: 40 mm (MD) × 100 mm (CD)
The target tape 19 of the 0 ° continuous peel strength to be measured is cut, and as shown in the perspective view of FIG. The fastening tape simulation member 71 shown in FIG. 5 is prepared. This fastening tape simulation member 71 is 100 m
m (CD) x 25 mm (MD) non-woven fabric base material 71a 25 mm (MD) x 24 mm (C
It is formed by adhering the surface fastener hook member 73 of D). Next, the surface fastener hook member 73 is allowed to stand still on the target tape 19 while aligning the CD directions with each other.
A 2 kg roller is reciprocated once on the hook member 73 to fix the hook member 73 to the target tape 19. Then, as shown in FIG. 7, using the corner portion of the table 83, a weight 87 of 1 kg is hung on the other end portion of the fastening tape simulating member 71 for 10 seconds to apply a shear load to the fastening surface. . Then, as shown in the side view of FIG.
The other end portion from which the above is removed is pulled vertically upward by the tester 81 to apply a peeling force in the direction perpendicular to the fastening surface.
The pulling speed is 300 mm / min. The load at this time was measured by the tensile test software SHIKIBU, and the average value of the measured uneven load was used as the fastening area (hook member 73
Area) to obtain a continuous peel strength of 90 °. 5 to 5 for the same target tape 19
Repeated times to measure the decrease in peel strength due to repeated stop and attachment.

The hook-and-loop fastener hook member 73 used for these measurements has a mushroom type hook, and the hook has a height of 285 (μm) and a base lower end outer diameter of 400 (μm).
m), the outer diameter of the upper end of the base is 300 (μm), the major axis of the umbrella is 420 (μm), the minor axis of the umbrella is 300 (μm), and the distribution density of hooks is 480 (pcs / cm ² ).

On the other hand, regarding the amount of fuzz of the target tape 19, the surface state of the target tape 19 after the fifth 90 ° continuous peeling strength measurement was visually observed, and the result was evaluated by four levels of sensory evaluation values (1: no fuzz). 2: Small fluff,
(3: During fluffing, 4: Large fluffing).

[0053]

【table】

As shown in the table, Example 1 is an "air-through nonwoven fabric", which is a condition of the present invention, and has a basis weight of 17-5.
At 0 g / m ² , the fineness of the short fibers is 0.5-8 denier. Are satisfied. And the shear strength has achieved "required shear strength of 3.0 (N / cm ² ) or more" which is the required specification of the disposable diaper for infants.
Further, in the case of 90 ° continuous peel strength (hereinafter referred to as peel strength), a decrease in peel strength after repeated stopper attachment / detachment was suppressed, and as a result, even the fifth peel strength in the table was 0.51.
(N / cm), and the required specification "necessary peel strength is 0.5 (N / cm) or more" has been achieved.

On the other hand, the spunbonded nonwoven fabric of Comparative Example 1 does not satisfy the conditions of the present invention in that the base material is a spunbonded nonwoven fabric, and as a result, Comparative Example 1 is the second time. The peel strength is below the required peel strength. The reason for this is that spunbond is a long fiber and is not entangled to the extent that many loops are formed, so that the hooks of the fastening tape are difficult to engage with each other, and the long fibers of each of them are strongly heated. It is possible that the entanglement is likely to be disengaged because it is not fused.

Further, the air-through nonwoven fabric of Comparative Example 2 having a basis weight of 15 g / m ² does not satisfy the conditions of the present invention in terms of basis weight, and as a result, in Comparative Example 2, shearing The strength is less than the required shear strength, and the first peel strength is less than the required peel strength. This is considered to be because the hook of the fastening tape could not be accommodated over the entire height thereof because the basis weight of Comparative Example 2 was small, and the hook could not be firmly engaged between the short fiber gaps of the nonwoven fabric.

In Example 2, the air temperature was further raised to 137 ° C. based on Example 1 described above, but the shear strength is improved as compared with Example 1. Regarding the peel strength, although the peel strength at the first time is about the same,
The peel strength after repeated attachment / detachment is less likely to decrease.
This is because in Example 2, the amount of fusion of the fibers increased as the air temperature was raised, and the fibers were entangled more firmly than in Example 1, and this entanglement was less likely to come off. it is conceivable that.

In Example 3, the leveling roller is further applied to Example 2, but the shear strength is improved as compared with Example 2. The peel strength is 1
Although the peel strength for the second time is about the same, the peel strength after repeated attachment / detachment is difficult to decrease. This is because the leveling roller makes it difficult for fluffing to occur after repeated stoppage / removal, keeps the distribution density of short fibers in a large state, and can contribute to engagement with the hook of the fastening tape even after repeated removal / attachment. It is considered that short fibers are difficult to decrease.

In Example 4, the embossing roller was further applied to Example 3, but the fluffing after repeated attachment and detachment was eliminated. Due to this, the decrease in peel strength after repeated attachment and detachment is almost completely prevented, and the peel strength at the first time can be maintained up to the fifth time. It is considered that this is because the short fibers are locally pressure-bonded by the embossed pattern, and the short fibers around the pressure-bonded portion and the periphery thereof are restrained to further suppress the fluffing of the short fibers.

In Example 5, the fiber fineness constitution was changed from that of Example 4, that is, the fiber constitution was changed from 6 denier to 60% and 2 denier to 40%.
Then, in Example 5 having this fineness configuration, the peel strength is significantly improved as a whole as compared with Example 4. This is 60% by weight of 6 denier fiber that expresses high tensile strength.
Since it contains the above, the tensile strength of the heat-fusible short fiber itself can be made sufficiently high, while the rest is made of 2 denier fiber, so that it is possible to form an interfiber gap of a predetermined size for the hook to enter. It is considered that the hook can be firmly engaged with these gaps.

[0061]

As described above, according to the present invention,
It is possible to provide a non-woven target tape and an absorbent article using the same, in which the peel strength with the hook-and-loop fastener hook member as the fastening tape is increased and the decrease in the peel strength after repeated stop and attachment is suppressed. .

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a disposable diaper to which a non-woven target tape is attached.

FIG. 2 is a conceptual diagram of a cross-sectional side view in a manufacturing process of an air-through nonwoven fabric.

FIG. 3 is a cross-sectional view of a fiber having a sheath-core structure.

FIG. 4 is a side view and a top view of a fastening tape having a mushroom type hook.

5A and 5B are a side view and a plan view of a fastening tape used for measuring the peel strength of a target tape.

FIG. 6 is a perspective view showing a state of a method for measuring shear strength.

FIG. 7 is a perspective view showing a state of a method of measuring 90 ° continuous peel strength.

FIG. 8 is a side view showing a state of a method of measuring 90 ° continuous peel strength.

[Explanation of symbols]

1 diaper body 3 top sheet 5 back sheet 11 front body 13 back body 15 side flaps 17 Fastening tape, hook-and-loop fastener hook material 19 Non-woven target tape

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Satoshi Matsui             4765-11 Samukawa-cho, Iyo-Mishima City, Ehime Prefecture             -In Paper Converting Co., Ltd. F-term (reference) 3B029 BD01 BD06                 4C098 AA09 CC10 CE06 CE10 CE15                       DD10

Claims (9)

[Claims] 1. A non-woven target tape which engages a hook-and-loop fastener hook member, wherein the non-woven target tape is blown with high temperature air to a web made of a large number of heat-fusible short fibers so that the fibers are separated from each other. It is an air-through non-woven fabric which is densely entangled and heat-fused, wherein the non-woven fabric has a basis weight of 17 to 50 g / m ² , and the short fibers of the non-woven fabric have a fineness of 0.5 to 8 denier. A non-woven target tape for a characteristic absorbent article. 2. 30 to 70% by weight of said nonwoven fabric is 4 to 8
It is composed of short fibers with a fineness of denier, and the rest is 0.5 to 3
The nonwoven fabric target tape for an absorbent article according to claim 1, wherein the target tape is made of short fibers having a fineness of denier. 3. The high temperature air temperature is a temperature at which the outer surface temperature of the heat fusible short fibers is 105% or more of the melting point of the fibers. A non-woven target tape for the absorbent article described. 4. The heat-fusible short fibers have a sheath-core structure in which a high-melting core material is provided in a low-melting sheath material, and the high-temperature air temperature is the outer surface temperature of the sheath material. Sheath material melting point 105
The nonwoven fabric target tape for an absorbent article according to claim 1 or 2, wherein the temperature is a melting point of not less than the core material and not more than%. 5. The heat-fusible short fibers are made of a thermoplastic resin, and the heat-bonded air-through nonwoven fabric is heated on the surfaces of a pair of rotating leveling rollers. A non-woven target tape of the absorbent article according to any one of 1 to 4. 6. The surface temperature of the leveling roller is set to be equal to or higher than the melting point of the heat-fusible short fibers.
A non-woven target tape of the absorbent article according to item 1. 7. The heat-fusible short fibers are a thermoplastic resin, and the heat-sealed air-through nonwoven fabric has a temperature of the nonwoven fabric of 50 ° C. or higher and a melting point of the heat-fusible short fibers or lower. The nonwoven fabric target tape of an absorbent article according to any one of claims 1 to 6, wherein the target tape is compressed by a pair of rotating embossing rollers when in a range. 8. An absorbent article using the target tape made of the non-woven fabric according to any one of claims 1 to 7. 9. The non-woven target tape is formed to be wider than the absorbent body, and is arranged over the entire length in the longitudinal direction of the absorbent article to be used as the back-side outermost layer sheet of the absorbent article. The absorbent article according to claim 8, which is characterized in that.