JP4332099B2 - Method for producing locking nonwoven fabric, locking nonwoven fabric and absorbent article - Google Patents

Description

The present invention relates to a method for producing a non-woven fabric for locking, a non-woven fabric for locking, and an absorbent article using the same.

Conventionally, a non-woven fastener comprising a female member having a locking surface and a male member having a locked surface can be manufactured at a low cost, has a strong locking force, and has a relatively high durability even during repeated attachment / detachment. It has a high utility and versatility in that it has been widely used from clothing, footwear and groceries to disposable toiletries.
Various improvements have been made for the purpose of further enhancing the usefulness of the non-woven fasteners. For example, as a non-woven fastener that can be manufactured at low cost, a film made of a nonwoven web is brought into contact with the adhesive side of the adhesive backing stretched, and a laminate is formed by the adhesive backing and the nonwoven web. On the upper side, a female member (for example, see Patent Document 1) formed by relaxing them, and a specific elongation that can more effectively exhibit the high locking force that is an advantage of a nonwoven fastener. A female member (for example, refer to Patent Document 2) formed by embossing a nonwoven fabric having a rate is known.
Japanese National Patent Publication No. 10-501160 Japanese Patent No. 3490608

However, in the invention described in Patent Document 1, although the manufacturing cost can be reduced, the female member is subjected to special processing different from the conventional one, and the manufacturing process itself is complicated and takes time. There was a problem.
Moreover, although the latching force with respect to a male member is high depending on invention mentioned in patent document 2, the surface base material of the latching surface of a female member will be destroyed by repeating attachment and detachment, and with a male member There was a problem that the locking force could not be maintained.

Then, the subject of this invention provides the manufacturing method of the nonwoven fabric for latching which can maintain the latching force of a latching surface by simpler process, the nonwoven fabric for latching, and an absorbent article using the same That is.

In order to solve the above problems, the invention according to claim 1, in locking nonwoven comprising Kakaritomeso for locking the engaged member, Ru plurality of holes are formed in the locking layer Thus , a base material layer that covers the entire locking surface formed by protruding the non-woven fabric around the hole and the surface of the locking layer opposite to the locking surface and blocks the opening of the hole. It is characterized by providing .

The invention described in claim 2 is characterized in that, in the non-woven fabric for locking according to claim 1, the locking layer and the base material layer are bonded by ultrasonic bonding .

The invention according to claim 3 is the non-woven fabric for locking according to claim 1 or 2 , wherein the locking surface of the locking layer is embossed with a repeating pattern to form the repeating pattern. It is characterized by the fact that minutes do not intersect .

According to a fourth aspect of the present invention, in the non-woven fabric for locking according to any one of the first to third aspects, at least one of the surfaces where the locking layer and the base material layer are in contact is predetermined. Is printed .

The invention according to claim 5 is divided into an abdominal side portion located on the abdomen side of the wearer at the time of wearing, a back side portion located on the back side, and a crotch portion located on the crotch, In the absorbent article provided with the latching | locking part provided, and the both-sides edge part of the said back side part, and the said latching | locking part and the to-be-retained latched part, the said latching | locking part is Claim 1 It is formed with the nonwoven fabric for latching as described in any one of 4 characterized by the above-mentioned.

The invention according to claim 6 is a method for producing a non-woven fabric for locking that is detachable from a locked member, and forming a hole in a locking layer made of a non-woven fabric, whereby the non-woven fabric around the hole is formed. A step of forming a protruding locking surface, a step of bonding a base material layer to a surface of the locking layer opposite to the locking surface, and the base on the locking surface of the locking layer. And a step of embossing toward the material layer .

According to the invention described in claim 1, a plurality of holes are formed in the locking layer, and the nonwoven fabric around the holes is provided so as to protrude from the surface opposite to the locking surface toward the locking surface. Therefore, the member to be locked is mainly locked to the protruding non-woven fabric around the hole of the locking surface.
As a result, even when the attachment and detachment of the locked member to and from the engaging surface is repeated, it is difficult for the nonwoven fabric other than the protruding nonwoven fabric around the hole to be subjected to the attachment and detachment, and the nonwoven fabric becomes fuzzy. The surface structure can be prevented from being destroyed by falling or falling off, and it is possible to lock the locking surface of the non-woven fabric for locking at a low cost by simpler processing without the need for special processing as in the past. You can maintain power.
Moreover, since the opening of the hole of the locking layer is blocked by the base material layer, for example, when the non-woven fabric for locking is adhered to another member, an adhesive is applied to the back surface of the base material layer. By doing so, the adhesive does not ooze out from the hole formed in the locking layer. Thereby, it is possible to avoid the destruction of the surface structure caused by the adhesive being cured in a state where the nonwoven fabric protruding around the hole portion of the locking surface is crushed, and without reducing the locking force of the locking surface The non-woven fabric for locking can be fixed to another member.

According to the second aspect of the present invention, the effect of the first aspect of the invention can of course be obtained, and in particular, the locking layer and the base material layer are bonded with ultrasonic waves. Both layers can be bonded without using an agent, and the locking layer and the base material layer can be bonded while preventing destruction of the surface structure of the locking surface due to the leakage of the adhesive from the hole. .

According to the invention described in claim 3, it is needless to say that the effect of the invention described in claim 1 or 2 can be obtained, in particular, a line segment constituting a repetitive pattern formed on the locking surface of the locking layer. There will be no intersection between them.
Therefore, even if a force is applied to the non-woven fabric for locking, there is no intersection as a starting point of the cleavage, so that the locking layer can be effectively prevented from being split.

According to the invention described in claim 4, the effect of the invention described in any one of claims 1 to 3 is obtained, and in particular, printing is performed between the locking layer and the base material layer. Will be given.
Thereby, for example, the resin for printing applied to the surface of the locking surface breaks the surface structure by coating and curing the nonwoven fabric on the surface of the locking surface, and the locking of the locking surface caused thereby Printing can be prevented from becoming unclear by reducing the force or printing on the back side of the base material layer, and printing can be performed clearly without reducing the locking force of the locking surface. Can do.

According to the invention described in claim 5, the effect of the invention described in any one of claims 1 to 4 can be obtained, and in particular, the hole is formed in the locking layer constituting the locking part. By providing, a latching | locking part can be provided without reducing the air permeability of a stomach side part, and the usability | use_condition of an absorbent article can be improved.

According to invention of Claim 6, the nonwoven fabric for latching which can maintain the latching force of a latching surface at low cost by simpler process is realizable.

Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated example.
FIG. 1 is a developed plan view of a disposable paper diaper (hereinafter referred to as “paper diaper”) 1 as an absorbent article exemplified as a preferred embodiment to which the present invention is applied. FIG. FIG. 3 is a perspective view in which the disposable diaper 1 is assembled in a state of being mounted, and FIG. 4 is a schematic sectional view taken along line IV-IV in FIG.

The paper diaper 1 includes a top sheet 1a made of a liquid-permeable nonwoven fabric provided on the contact surface side with the human body, and a liquid-impermeable back sheet 1b provided on the outer side opposite to the contact surface with the human body when worn. The absorbent body 1c is interposed between the top sheet 1a and the back sheet 1b.
The paper diaper 1 is formed so as to cover the wearer's crotch portion from the abdominal side to the back side when worn. Specifically, a ventral part 2 located on the ventral side of the wearer is formed at one end, and a dorsal part 3 positioned on the dorsal side of the wearer is formed at the other end. A crotch part 4 located at the crotch of the wearer is formed between the part 2 and the back side part 3.

The top sheet 1a is a liquid-permeable sheet that is provided on a surface that comes into contact with the human body when the paper diaper 1 is worn, and plays a role of receiving body fluid and transporting it to the absorber 1c.
Examples of the liquid-permeable sheet include those formed of a porous or non-porous nonwoven fabric, a porous plastic sheet, and the like. As the material fiber constituting the nonwoven fabric, either natural fiber or chemical fiber may be used.
Examples of natural fibers include cotton, cellulose (wood pulp), wool, silk, hemp and the like.
Examples of chemical fibers include olefins such as polyethylene (PE) and polypropylene (PP), polyesters including polyethylene terephthalate (PET), polyamides such as nylon and aramid, and acrylics such as polyacrylonitrile (PAN). In addition to such synthetic fibers, regenerated fibers such as rayon and cupra, semi-synthetic fibers such as cellulose acetate and promix, and the like can be mentioned. Moreover, the bicomponent fiber (mixed fiber) etc. which combined the said raw material suitably other than PE / PP mixed nonwoven fabric and PE / PET mixed nonwoven fabric can also be used.

  As a method for producing a nonwoven fabric from these fiber materials, known methods can be used as appropriate. For example, a water punch method in which fibers are entangled with each other with a high-pressure water stream, a wet method such as a papermaking method in which fibers are produced in the same manner as papermaking, a synthetic resin, etc. is heated and melted, extruded from a die, and stretched. The spunbond method that uniformly disperses the long fibers formed by thermobonding, the chemical bond method that joins with an adhesive, the thermal bond method that joins with a low-melting polymer and self-melting fiber, and the needling with a special needle. Examples thereof include a dry method such as a needle punching method for bonding and a direct method such as a flash spinning method in which a polymer solution is ejected from a die to form a network fibril. Moreover, a nonwoven fabric can be manufactured also by the method etc. which combined these methods.

The back sheet 1b is a liquid-impermeable sheet that is provided on the surface opposite to the surface that contacts the human body when the paper diaper 1 is worn, and prevents the body diaper 1 from seeping out and leaking out of the paper diaper 1. It is.
As the liquid-impervious sheet, for example, a sheet material having at least water-impervious properties such as polyethylene, and preferably a sheet material having moisture permeability from the viewpoint of preventing stuffiness. As a sheet material having this water barrier property and moisture permeability, for example, a sheet is formed by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretched in a uniaxial or biaxial direction. The microporous sheet material obtained by is preferably used.
In addition, a laminated nonwoven fabric composed of a liquid-impermeable film layer and a breathable nonwoven layer may be used. A laminated nonwoven fabric is a nonwoven fabric called a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, for example, and is a nonwoven fabric having both liquid impermeability and air permeability.

  Absorbent body 1c is formed by combining an absorbent material such as cotton or pulp, or a sheet-like base material such as fiber or film and a superabsorbent polymer such as a superabsorbent polymer ( (Not shown) is covered with a liquid-permeable crepe paper (not shown) or the like. The absorber 1c may have a single layer structure or a structure divided into a plurality of layers. The absorber 1c is mounted at a position extending from the abdominal side 2 of the human body to the back side 3 through the crotch 4 between both legs.

Moreover, the latching | locking part 5 is provided in the back sheet | seat 1b side of the abdominal side part 2, and the top sheet of the side edge parts 31 and 31 provided so that it might protrude from the back side part 3 in the transversal direction of the paper diaper 1 was provided. On the 1a side, a locking portion 5 and detachable locked portions 6, 6 are provided. The side edge portion 31 is formed of, for example, a nonwoven fabric exemplified as the top sheet 1a, and the locked portions 6 and 6 provided on the side edge portions 31 and 31 are, for example, males as locked members. It is formed by a mold member or the like.
Therefore, the wearer contacts the stomach side 2 of the disposable diaper 1 to the stomach side, the back side 3 to the back side, and the crotch part 4 to the crotch, and is provided on both side edges 31, 31 of the back side 3. The disposable diaper 1 can be mounted by locking the locked portions 6 and 6 thus obtained to the locking portion 5 provided on the ventral side portion 2 over the waist. The leg circumference of the wearer is covered by a side edge of the crotch part 4 formed so that a part of the side edge of the abdominal side part 2 and a part of the side edge of the back side part 3 and both sides are recessed inward. Therefore, the waist circumference of the wearer is covered with the abdominal side 2 and the back side 3.

The locking part 5 is configured by a locking nonwoven fabric. FIG. 5 is an enlarged cross-sectional view of the locking portion 5. The locking nonwoven fabric constituting the locking part 5 includes a locking layer 5A including a locking surface 51 formed by locking the locked part 6 made of a locked member such as a male member, and a locking layer. And a base material layer 5B that covers the entire surface opposite to the locking surface 51 of 5A.
As shown in FIG. 5, the hole 7 is formed in the locking layer 5 </ b> A, and the nonwoven fabric around the hole 7 projects from the surface opposite to the locking surface 51 toward the locking surface 51. It is provided as follows. A plurality of the hole portions 7 are formed so as to be uniformly distributed over the entire surface of the locking layer 5A, and the hole portions 7 are formed by, for example, drilling. And the nonwoven fabric part which mainly protrudes around the hole part 7 contacts the to-be-latched part 6, and latches the to-be-latched part 6. FIG.

For the locking layer 5A, for example, a single composition material or a composite composition material made of a widely known and versatile plastic material such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), nylon, etc. However, it is preferable to use single composition PP from the viewpoint of cost.
Moreover, it is preferable to use the spunbond nonwoven fabric comprised by a long fiber for 5 A of latching layers. This is because the short-fiber point bond nonwoven fabric and air-through nonwoven fabric are easy to come out because the fiber length is short, and the strength is insufficient, and it is composed of continuous long fibers, less frayed from the cut surface, and due to fuzzing This is because a spunbonded nonwoven fabric with less fiber dropping is excellent in terms of mechanical performance and productivity.
Furthermore, the basis weight of the locking layer 5A is, for example, preferably 5 to 70 (g / m ² ), and more preferably 10 to 30 (g / m ² ). In the case of 70 (g / m ² ) or more, the use feeling of the disposable diaper 1 is reduced due to the bulk of the locking layer 5A itself. In the case of 10 (g / m ² ) or less, This is because the number of loops formed in the locking layer 5A is not sufficient, and the locking ability is reduced.
And the fiber diameter of the nonwoven fabric which comprises 5 A of latching layers has preferable 1-10 (d; denier), for example, More preferably, it is 1-7 (d). When the fiber diameter is 1 (d) or less, the loop is easy to sag, entangled during manufacture, or easily cut when the paper diaper 1 is used. This is because the opening width of the loop is narrowed and the male member of the locked portion 6 is difficult to engage with the loop.

The base material layer 5 </ b> B is provided so as to cover the entire surface opposite to the locking surface 51 of the locking layer 5 </ b> A so as to close the opening of the hole 7.
The base material layer 5B can use a single composition material or a composite material made of a plastic material such as PP, PE, PET, nylon, etc., like the locking layer 5A, and a single composition PP can be used. From the viewpoint of cost.
Moreover, it is preferable to use a spunbond nonwoven fabric for the base material layer 5B rather than a point bond nonwoven fabric or an air-through nonwoven fabric, and the basis weight is preferably, for example, 5 to 70 (g / m ² ), more preferably 10 to 30. (G / m ² ). The fiber diameter is preferably, for example, 1 to 10 (d), and more preferably 1 to 7 (d). Both are based on the same reason as that shown for the locking layer 5A.

(Print processing)
Printing is performed on the surface of the locking layer 5A in contact with the base material layer 5B. Specifically, printing is performed by curing a printing resin on the side opposite to the locking surface 51 of the locking layer 5A. The predetermined printing applied here is, for example, a pattern or a logo. Specific printing methods include, for example, letterpress (letter plate) printing, stencil (screen) printing, planographic (offset) printing, intaglio ( Gravure) printing and inkjet printing.

(Adhesion processing)
The locking layer 5A made of a spunbonded nonwoven fabric and the base material layer 5B are bonded by ultrasonic bonding, which is an bonding method in which a plastic material is fusion bonded with frictional heat.
The ultrasonic bonding is performed under conditions such as 20 to 35 KHz using an ultrasonic welder manufactured by Seidensha Electronics Co., Ltd., for example.
This is to avoid the adverse effects that occur when, for example, the locking layer 5A and the base material layer 5B are bonded using an adhesive such as hot melt. Specifically, the adhesive applied to the bonding surface of the locking layer 5A and the base material layer 5B oozes out from the hole 7 provided in the locking layer 5A to the surface of the locking surface 51, and the periphery of the hole 7 This is to avoid crushing and solidifying the non-woven fabric protruding to reduce the locking ability of the locking surface 51. Therefore, the ultrasonic bonding method is most preferable because only the non-woven fabric of the contact portion is dissolved by the frictional heat generated at the contact point between the locking layer 5A and the base material layer 5B, thereby allowing the two layers to be bonded. However, as long as it is a method capable of bonding without reducing the locking ability of the locking surface 51, a suitable bonding method can be appropriately selected and employed from the mechanical bonding method, the chemical bonding method, and the like.

(Embossing)
The locking surface 51 of the locking layer 5A is embossed with the repeated pattern 8.
FIG. 6A shows the minimum pattern 80 of the repeated pattern 8 applied to the locking surface 51. The minimum pattern 80 of the repetitive pattern 8 includes two circular portions 81 (81a, 81b) formed by line segments having a width of, for example, about 0.4 (mm), and a width of, for example, about 0.4 (mm). ) And has a length of, for example, four linear portions 82 (82a, 82b, 82c, 82d) formed by line segments of about 5.0 (mm).
Specifically, the four linear portions 82 are arranged radially with the circular portion 81a as the center, and the two linear portions 82 opposed across the circular portion 81a are positioned on a straight line. The minimum pattern 80 of the repeated pattern 8 is formed of the circular portions 81b arranged at a predetermined interval at the tip of one linear portion 82.
At this time, since each circular part 81 (81a, 81b) and each linear part 82 (linear part 82a, 82b, 82c, 82d) are arrange | positioned at intervals of about 0.8 (mm), for example, The line segments forming the minimum pattern 80 do not intersect.
Furthermore, since the plurality of minimum patterns 80 forming the repetitive pattern 8 are also arranged with an interval of, for example, about 0.8 (mm) between the adjacent minimum patterns 80, the minimum pattern 80 is fixed to the locking surface. Even in the case where the upper and lower sides and the left and right sides are continuously arranged in 51 (see FIG. 6B), the line segments forming the repetitive pattern 8 do not intersect with each other, and the repetitive pattern 8 has no intersection. It becomes.
Since the latching | locking part 5 is provided in the back seat | sheet 1b side of the abdominal side part 2, it will be provided in the part which covers a wearer's waist circumference. Accordingly, when wearing, particularly force is applied in the waist direction (that is, lateral direction) and the direction substantially orthogonal to the waist direction (that is, longitudinal direction), the tensile force in this direction. In order to provide high durability, it is possible to arrange the repeated pattern 8 so that two straight lines formed by arranging the circular portions 81 and the linear portions 82 are not parallel to the vertical and horizontal directions. preferable. In the present embodiment, the inner angle formed by the linear portion 82a and the linear portion 82c is approximately 90 °, and two intersecting straight lines are arranged obliquely at the locking portion 5 when the disposable diaper 1 is mounted. (See FIG. 1).

(Drilling)
The diameter of the opening of the hole 7 is, for example, about 2.0 (mm), and the distance in the CD (Cross Direction) direction between the adjacent holes 7 is, for example, about 2.7 (mm). The distance in the MD (Machine Direction) direction is, for example, about 5.6 (mm).
The hole 7 can be formed in the locking layer 5A by, for example, sucking the locking layer 5A from the locking surface 51 side with a vacuum device having a plurality of suction ports. In addition, for example, it can be formed by penetrating a pin or the like from the surface opposite to the locking surface 51 into the locking layer 5A.

According to the paper diaper 1 described above, a plurality of hole portions 7 that are perforated so that the nonwoven fabric projects from the surface opposite to the locking surface 51 toward the locking surface 51 are formed in the locking layer 5A. Therefore, the locked portion 6 made of the locked member is mainly locked to the protruding non-woven fabric around the hole 7 of the locking surface 51. Thereby, even if it is a case where the attachment and detachment to the locking surface 51 of the locked part 6 is repeatedly performed, it becomes difficult to apply a load at the time of attachment and detachment to the nonwoven fabric other than the protruding nonwoven fabric around the hole 7, The destruction of the surface structure due to the non-woven fabric fluffing or falling off is suppressed, and the locking surface 51 of the non-woven fabric for locking can be obtained by simpler processing without applying special processing as in the prior art. The locking force can be maintained. Further, since no special processing is performed, the locking force can be maintained at a low cost.
Moreover, since the opening of the hole 7 of the locking layer 5A is closed by the base material layer 5B, when the non-woven fabric for locking is adhered to the back sheet 1b, it is applied to the back surface of the base material layer 5B. The adhesive does not ooze out from the hole 7 formed in the locking layer 5A toward the locking surface 51 and crush and harden the nonwoven fabric protruding around the hole 7, that is, the locking surface. The non-woven fabric for locking can be fixed to the back sheet 1b without reducing the locking force of 51.
Then, since the locking layer 5A and the base material layer 5B are bonded with ultrasonic waves, both layers can be bonded without using an adhesive, and the adhesive 7 oozes out from the hole 7. The locking layer 5A and the base material layer 5B can be bonded while preventing the surface structure of the locking surface 51 from being destroyed.
Furthermore, since there is no intersection between the line segments constituting the repetitive pattern 8 formed on the locking surface 51 of the locking layer 5A, there is an intersection serving as a starting point of cleavage even when a force is applied to the locking nonwoven fabric. Therefore, it is possible to effectively prevent the locking layer 5A from being cleaved.
In addition, the printing is performed between the locking layer 5A and the base material layer 5B, so that the locking is brought about by the printing process performed by kneading and curing the resin and coating the nonwoven fabric in the printing area. It is possible to avoid the destruction of the surface structure of the surface 51 and the unclearness of printing due to the printing process on the back surface of the base material layer 5B, and the clear printing process without reducing the locking force of the locking surface 51 Can be applied.
And by providing the hole 7 in the locking surface 51 that constitutes the locking part 5 of the paper diaper 1, the locking part 5 can be provided without reducing the air permeability of the ventral side part 2, Not only can the usability of the disposable diaper 1 be improved, but also by bonding the locking layer 5A and the base material layer 5B with ultrasonic waves, both layers are bonded only at the contact portion, and the texture becomes soft. Further, the feeling of use can be improved.

In addition, although the disposable paper diaper was mentioned as an example as an absorbent article, it is not restricted to this, For example, it can apply suitably also to the paper diaper cover etc. which mount | wear and use an absorber.
Alternatively, the locking layer 5A and the base material layer 5B may be bonded together by heat sealing when embossing the locking surface 51. This is because, by performing the bonding of both layers and the embossing by a single heat seal, the softness of the texture can be relatively maintained even by the heat seal.

  Although the printing on the locking portion 5 is performed on the surface of the locking layer 5A in contact with the base material layer 5B, it may be performed on the surface of the base material layer 5B in contact with the locking layer 5A. By printing on the base material layer 5B, the printing resin is cured on the base material layer 5B side, so that the shape of the hole 7 provided in the locking layer 5A can be more reliably maintained. At the same time, the sharpness of printed characters and patterns can be maintained.

  The order of each process (printing process, punching process, bonding process, embossing process) applied to the locking part 5 is performed after the printing is performed on the locking layer 5A or the base material layer 5B (printing process). It is preferable that the hole 7 is provided in 5A (perforation processing), and the locking layer 51 is embossed after the locking layer 5A and the base material layer 5B are bonded by ultrasonic waves (bonding processing). However, it is not always necessary to follow this processing order, and the processing order may be changed as appropriate.

The minimum pattern 80 of the repetitive pattern 8 is not limited to the pattern described with reference to FIG. 6, and the shape and dimensions are arbitrarily set as long as the line segments forming the pattern do not intersect with each other. be able to.
Furthermore, the raw material of the side edge part 31 is not restricted to a nonwoven fabric, For example, you may be comprised from the elastic member, the film, etc. Moreover, the side edge part 31 does not necessarily need to be a separate body from the top sheet 1 a and the back sheet 1 b, and a part of the top sheet 1 a and the back sheet 1 b is further extended to the side of the back side part 3. It is good also as forming by.
Next, the Example of the paper diaper 1 based on this invention demonstrated above is demonstrated with a comparative example.
[Example]

(Composition, weight per unit area and weight)
Engaging portion of the embodiment, 30 g / m engaging layer and which is formed by ^two of the basis weight of the spunbonded nonwoven fabric made of PP, group formed by spun bond nonwoven fabric made of PP having a basis weight of 30 g / m ² It consists of two layers of material layers.
Further, the repetitive pattern (embossed pattern) by embossing is the intersection absent type shown in FIG. 6 and has a hole formed in the locking portion.
Table 1 shows the composition of the examples, the production method (nonwoven fabric type), the emboss pattern, and the presence or absence of holes.

(Repeated peel strength durability, shear strength)
Next, in order to evaluate that the paper diaper having the locking portion manufactured as described above has durability even when repeatedly peeled, repeated peel strength (kgf) durability and shear strength (kgf ) Was evaluated.

The method for measuring repeated peel strength durability is as follows.
After applying the load of 2kg by laminating the locking surface of the locking portion and the hook tape with a 2kg roller, pulling in the peeling direction at 300mm / min, until the surface of the locking surface cannot be measured due to the substrate destruction The number of times was measured. The results are shown in Table 1. In addition, the results of the first peel strength are also shown in Table 1.

[比較例] The method for measuring the shear strength is as follows.
After the locking surface of the locking portion and the hook tape were bonded with a 2 kg roller, the load when the plate was pulled horizontally and sheared was measured. The results are shown in Table 1.

[Comparative example]

(Composition, weight per unit area and weight)
The locking portion of Comparative Example 1 is formed by a locking layer formed of a three-layer spunbond nonwoven fabric composed of PP having a basis weight of 18 g / m ² and a spunbond nonwoven fabric composed of PP having a basis weight of 50 g / m ² . It consists of two layers of the base material layer to be formed.
On the other hand, the latching | locking part of the comparative example 2 consists of one layer, and is formed with the air through nonwoven fabric which consists of PP / PE of the fabric weight of 46 g / m < ² >.
Moreover, the emboss pattern of the comparative example 1 is a large linear diamond type (refer FIG. 7A), Comprising: A hole is not formed in a latching | locking part.
On the other hand, the embossed pattern of Comparative Example 2 is a small linear diamond type (see FIG. 7B), and no hole is formed in the locking portion.
Table 1 shows the compositions of Comparative Examples 1 and 2, the production method (nonwoven fabric type), the embossed pattern, and the presence or absence of holes.

(Repeated peel strength durability, shear strength)
Each evaluation of repeated peel strength durability and shear strength was performed by the same method as the test method shown in the examples. The results are shown in Table 1.

[Evaluation]
Each result was then evaluated.
(Repeated peel strength durability)
The first peel strength was higher in the order of Example (234 (kgf)), Comparative Example 2 (202 (kgf)), and Comparative Example 1 (159 (kgf)).
From this result, although the latching portion (Comparative Example 2) made of an air-through nonwoven fabric has higher peel strength than the latching portion (Comparative Example 1) made of a spunbond nonwoven fabric, the spunbond nonwoven fabric has a hole. It was found that the part (Example) has higher peel strength than the locking part (Comparative Example 2) made of an air-through nonwoven fabric. Thereby, even if it was the spun bond nonwoven fabric inferior to an air through nonwoven fabric, it was confirmed that a locking force improves by providing a hole.

On the other hand, the repeated peel strength durability was higher in the order of Example (28 times), Comparative Example 2 (10 times), and Comparative Example 1 (4 times).
Also from this result, it turns out that the latching | locking part (Example) in which a hole is formed has high durability rather than the latching | locking part (Comparative Example 1 and Comparative Example 2) in which the hole is not formed. It was.

(Shear strength)
The shear strength was higher in the order of Example (6.3 (kgf)), Comparative Example 1 (3.2 (kgf)), and Comparative Example 2 (2.6 (kgf)).
From this result, it was found that the engaging portions (Example and Comparative Example 1) made of the spunbonded nonwoven fabric had higher shear strength than the engaging portions made of the air-through non-woven fabric (Comparative Example 2).

  Furthermore, it turned out that the latching | locking part (Example) which has an embossing pattern of an intersection absence type | mold has the highest shear strength.

It is the plane development view which developed the paper diaper to which the absorptive article of the embodiment of the present invention was applied, making the back sheet the upper surface. FIG. 2 is a plan development view in which the paper diaper of FIG. It is the perspective view which assembled the paper diaper of FIG. 1 in the state at the time of mounting | wearing. It is sectional drawing in the IV-IV line of FIG. It is an expanded sectional view of a locking part. It is explanatory drawing for demonstrating the pattern of a repeating pattern. It is explanatory drawing for demonstrating the repeating pattern of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper diaper 1a Top sheet 1b Back sheet 1c Absorber 2 Abdomen side part 3 Back side part 4 Crotch part 5 Locking part 5A Locking layer 51 Locking surface 5B Base material layer 6 Locked part 7 Hole part 8 Repeat pattern 81 (81a, 81b) Circular part 82 (82a, 82b, 82c, 82d) Linear part

Claims (6)

In the non-woven fabric for locking provided with a locking layer for locking the locked member,
In Rukoto is formed a plurality of holes in the locking layer, and the locking surface of the nonwoven fabric around the hole is protruded,
A non-woven fabric for locking, comprising a base material layer that covers the entire surface of the locking layer opposite to the locking surface and blocks the opening of the hole. In the non-woven fabric for locking according to claim 1 ,
A non-woven fabric for locking, wherein the locking layer and the base material layer are bonded by ultrasonic bonding. In the non-woven fabric for locking according to claim 1 or 2 ,
The locking surface of the locking layer is embossed with a repeated pattern,
A non-woven fabric for locking, wherein the line segments forming the repetitive pattern do not cross each other. In the non-woven fabric for locking according to any one of claims 1 to 3 ,
A non-woven fabric for locking, wherein a predetermined printing is applied to at least one of the surfaces where the locking layer and the base material layer are in contact with each other. The abdomen located on the abdomen side of the wearer at the time of wearing, the dorsal side part located on the dorsal side, and the crotch lower part located on the crotch, the locking part provided on the abdomen side part, and the back In an absorbent article provided on both side edges of the side part, comprising the locking part and a detachable locked part,
The said latching | locking part is formed with the nonwoven fabric for latching as described in any one of Claims 1-4 , The absorbent article characterized by the above-mentioned.   A method of manufacturing a non-woven fabric for locking that is detachable from a locked member,
  A step of forming a locking surface formed by projecting the nonwoven fabric around the hole by forming a hole in the locking layer made of a nonwoven fabric; and
  Adhering a base material layer to a surface of the locking layer opposite to the locking surface;
  Embossing toward the base material layer on the locking surface of the locking layer; and
  The manufacturing method of the nonwoven fabric for latching characterized by providing.

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