TWI755495B - Composite telescopic member and disposable diaper having the same - Google Patents

Abstract

The composite telescopic member (10) of the present invention intermittently has a plurality of fixing portions (14) for fixing the elastic member (13) and the two sheets (11, 12) along the direction in which the elastic member (13) extends. The composite telescopic member (10) is provided with a non-fixed elastic member (13) and two sheets (11, 12) between the adjacent fixed portions (14) along the direction in which the elastic member (13) extends. Section (16). The composite telescopic member (10) has a pleat (15) extending in a direction intersecting the direction in which the elastic member (13) extends. When the composite telescopic element (10) is stretched by 25% from its relaxed state, the difference between the elongation of the composite telescopic element and the elongation of the fixed part and the difference with the elongation of the non-fixed part are respectively: Within ±15%.

Description

Composite telescopic member and disposable diaper having the same

The present invention relates to a composite telescopic member and a disposable diaper provided with the same.

In absorbent articles such as disposable diapers, an elastic member is widely joined to a sheet in an extended state, and the elastic member is contracted to form an expansion-contraction portion having a large number of wrinkles in the sheet. For example, Patent Document 1 describes a stretchable composite sheet 1 in which two sheets 2 and 3 are joined to a plurality of joining regions 5 . The plurality of joint regions 5 are intermittently arranged in the expansion-contraction direction X of the elastic member 4, and are arranged intermittently or continuously in the orthogonal direction Y thereof. In addition, a plurality of bonding wires 50 and 51 including a plurality of bonding regions 5 are formed along the two directions X and Y, respectively. The plurality of joint regions 5 have joint portions 7 and non-joint portions 8 for joining the sheets 2 and 3, and are alternately arranged in at least one of the expansion-contraction direction X and its orthogonal direction Y.

In Patent Document 2, an elastic sheet-like composite including a strand and an elastic sheet formed by bonding the strands is described. The elastic sheet-like composite body has arc-shaped portions protruding from the strands between the sheet bonding positions.

The expansion-contraction structure of the absorbent article provided with the 1st layer and the 2nd layer which pinched|interposed a plurality of elastic elastic members and this elastic elastic member is described in patent document 3. The 1st layer and the 2nd layer form a sheet|seat joining part by the adhesive agent apply|coating in the stripe pattern which becomes intermittent in the expansion-contraction direction. The elastic elastic member is fixed to the first layer and the second layer by an adhesive at a position intersecting with the sheet joint portion. In addition, the first layer and the second layer are contracted in accordance with the contraction of the elastic elastic member, whereby the portions of the first layer and the second layer located between the sheet joint portions are swelled in opposite directions to each other, respectively. Form folds.

[Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2009-148447

[Patent Document 2] Japanese Patent Publication No. Hei 10-501195

[Patent Document 3] International Publication No. 2015-151871

The present invention provides a composite telescopic member, which has two sheets, and a plurality of elastic members extending in one direction disposed between the two sheets, and capable of expanding and contracting in the one direction.

The said composite expansion-contraction member intermittently has a plurality of fixing|fixed part which fixes the said elastic member and two said sheet|seats along the direction in which this elastic member extends.

The said composite expansion-contraction member has a non-fixed part which is not fixed to the said elastic member and two sheets of the said sheet material between the said fixed part which adjoins along the direction in which the said elastic member extends.

The two sheets located in the non-fixed portion protrude in a direction away from each other, and a plurality of rows of pleats extending in a direction intersecting the direction in which the elastic member extends are formed along the direction in which the elastic member extends.

The difference between the elongation of the composite telescopic element and the elongation of the fixed portion, and the elongation of the composite telescopic element and the elongation of the non-fixed portion when the composite telescopic element is stretched by 25% from its relaxed state The difference in rate is within ±15%.

Furthermore, the present invention provides a composite telescopic member having two sheets and a plurality of elastic members extending in one direction disposed between the two sheets, and capable of expanding and contracting in the one direction.

The said composite expansion-contraction member intermittently has a plurality of fixing|fixed part which fixes the said elastic member and two said sheet|seats along the direction in which this elastic member extends.

The said composite expansion-contraction member has a non-fixed part which is not fixed to the said elastic member and two said sheet|seats between the said fixed parts which adjoin along the direction in which the said elastic member extends.

The two sheets located in the non-fixed portion protrude in a direction away from each other, and a plurality of rows of pleats extending in a direction intersecting the direction in which the elastic member extends are formed along the direction in which the elastic member extends.

At least one of the two sheets has a plurality of embossed portions, and there are a plurality of rows side by side in a direction orthogonal to the direction in which the elastic members extend, and are arranged side by side at a specific distance in the direction in which the elastic members extend. A plurality of embossed portion rows of the above-mentioned embossed portions.

In at least a part of the above-mentioned embossed portion row in the above-mentioned sheet, the distance between the above-mentioned embossed portions is smaller than the length of the above-mentioned fixed portion in an elongation limit state.

10: Composite telescopic elements

11: Sheet

12: Sheet

13: Elastic components

14: Fixed part

15: Folds

16: Non-fixed part

20: Embossed part

21: Embossing line

100: Composite telescopic element

113: Elastic member

114: Fixed part

116: non-fixed part

a: length

a1: length

a2: length

a3: length

a1': length

a2': length

a3': length

a4': length

b: length

b1: length

b2: length

b3: length

b1': length

b2': length

b3': length

b4': length

D: Interval

P: Pitch

P1: Pitch

P2: Spacing

S: space

Fig. 1 is a cross-sectional view showing an embodiment of the composite telescopic element of the present invention.

FIG. 2 is a cross-sectional view of the composite telescopic element shown in FIG. 1 in an extended state.

FIG. 3 is a cross-sectional view of the composite telescopic element viewed from a direction orthogonal to FIG. 2 .

FIGS. 4( a ) to ( c ) are cross-sectional views in the thickness direction showing changes when the composite telescopic member of the present invention is elongated from its relaxed state.

FIGS. 5( a ) to ( d ) are cross-sectional views in the thickness direction showing a change when the conventional composite telescopic element is elongated from its relaxed state.

FIGS. 6( a ) to ( c ) are plan views showing the state in which the sheet of the composite telescopic element has been embossed.

Fig. 7 is a cross-sectional view (corresponding to Fig. 2 ) of the composite telescopic element according to another embodiment of the present invention when it is in an extended state.

According to the expansion-contraction member described in each of the above-mentioned patent documents, a plurality of pleats are formed in the relaxed state. However, when an external force is applied to a wrinkle, there is a case where the wrinkle tends to incline, and the softness or cushioning feeling brought by the wrinkle is reduced.

The present invention is an improvement of a stretchable elastic member with wrinkles, and more specifically, relates to a composite stretchable member that can maintain the softness or cushioning feeling brought by the wrinkles even when external force is applied to the wrinkles.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. Fig. 1 is a cross-sectional view showing an embodiment of the composite telescopic element of the present invention. This sectional view is a sectional view in the thickness direction cut along the direction in which the elastic member extends when the composite telescopic member is in a relaxed state. FIG. 2 is a cross-sectional view of the composite telescopic element shown in FIG. 1 in an extended state. FIG. 3 is a cross-sectional view viewed from a direction orthogonal to FIG. 2 . The composite expansion-contraction member 10 of this embodiment has two sheets 11 and 12, and the some elastic member 13 arrange|positioned between these two sheets. The sheets 11 and 12 and the elastic member 13 constitute an expansion-contraction portion in the composite telescopic element 10 . The telescopic portion can expand and contract along the direction in which the elastic member extends.

The elastic member 13 is an elongated member, usually called a rubber wire or a wire material. The thickness, material and elastic modulus of each elastic member 13 may be the same, or may be different. Generally, the same thing is used as each elastic member 13, but it is not limited to this. Each elastic member 13 is arranged and fixed between the sheets 11 and 12 so as to extend in one direction in an extended state. Therefore, the composite telescopic element 10 can expand and contract in this direction. The plurality of elastic members 13 are arranged substantially parallel to each other with intervals in the direction intersecting with the extending direction. Therefore, the interval D (refer to FIG. 3 ) between adjacent elastic members 13 is substantially the same at any position of the elastic members 13 . The interval D between any two adjacent elastic members 13 may be the same or different. Generally speaking, the interval D between any two adjacent elastic members 13 is substantially the same. The interval D is preferably 0.5 mm or more, More preferably, it is 0.75 mm or more, and still more preferably 1 mm or more. Moreover, 3 mm or less is preferable, 2.5 mm or less is more preferable, and 2 mm or less is further more preferable. Specifically, the interval D is preferably 0.5 mm or more and 3 mm or less, more preferably 0.75 mm or more and 2.5 mm or less, and still more preferably 1 mm or more and 2 mm or less. By setting the interval D to this range, the appearance of the following pleats 15 can be further improved.

The respective elastic members 13 are respectively fixed to the two sheets 11 and 12 sandwiching the elastic members 13 , whereby the fixed portion 14 is formed in the composite elastic member 10 . Each elastic member 13 and the two sheets 11 and 12 are intermittently fixed along the direction in which the elastic member 13 extends. Therefore, when viewed along the direction in which one elastic member 13 extends, a plurality of fixed portions 14 are intermittently formed along the direction in which the elastic member 13 extends.

In the fixing part 14, the two sheets 11 and 12 and the elastic member 13 are fixed by various fixing methods. As the fixing method, the method used for the telescopic member of this type is appropriately used. As such a method, bonding by an adhesive agent, thermal fusion, or bonding by ultrasonic vibration, etc. are mentioned, for example. Among these fixing methods, as described below, from the viewpoint of imparting stretchability to the fixing portion 14, it is preferable to use bonding using an adhesive.

As shown in FIG. 1 , in the relaxed state of the composite telescopic member 10 , the two sheets 11 and 12 located between the adjacent fixing portions 14 along the extending direction of the elastic member 13 protrude in the direction away from each other, The pleats 15 extending in a direction intersecting the direction in which the elastic member 13 extends are formed in plural rows along the direction in which the elastic member 13 extends. Specifically, in the thickness direction cross-section of the composite telescopic element 10 , in the relaxed state of the composite telescopic element 10 , the two sheets 11 and 12 located between the adjacent fixing portions 14 are deformed into an arc shape. A plurality of pleats 15 are formed in the composite telescopic element 10 by the arc-shaped deformation. The pleats 15 extend in a direction intersecting with the direction in which the elastic members 13 extend. Moreover, the pleats 15 are formed in plural rows along the direction in which the elastic members 13 extend.

From the viewpoint of improving the appearance of the pleats 15, it is preferable to arrange the fixing portion 14 in a direction intersecting the direction in which the elastic member 13 extends, and to form a fixing portion row (not shown) including a plurality of fixing portions 14. ). The fixed portion row preferably extends linearly along a direction intersecting the direction in which the elastic member 13 extends. In addition, a plurality of fixed portion rows are arranged side by side along the direction in which the elastic member 13 extends. In terms of further improving the appearance of the pleats 15, it is particularly preferable that the fixing portion row extends linearly in a direction orthogonal to the direction in which the elastic member 13 extends, and a plurality of fixing portion rows are formed, and a plurality of fixing portion rows are formed. The rows and a plurality of pleats 15 are alternately arranged in the direction in which the elastic member 13 extends. In the present embodiment, the two sheets 11 and 12 are joined to each other in the region between the respective elastic members 13 , that is, the region between the adjacent fixing portions 14 in the fixing portion row. More specifically, the two sheets 11 and 12 and the elastic member 13 of the composite telescopic member 10 are fixed by bonding with an adhesive, and in the row of the fixing portion, the adhesive is straddling each elastic member 13 The elastic members 13 are continuously extended and arranged in a direction intersecting with the direction in which the elastic member 13 extends.

The respective fixed portion rows are arranged substantially in parallel. Therefore, the interval between adjacent fixing portion rows is substantially the same at any position of the fixing portion row. The interval between any two adjacent rows of fixed portions may be the same, or may be different. Generally speaking, the interval between any two adjacent rows of fixed portions is substantially the same. The space between the rows of the fixed portion mentioned here has the same meaning as the length of the non-fixed portion 16 described below.

As shown in FIGS. 1 and 2 , between the plurality of fixed portions 14 adjacent to each other along the direction in which the elastic member 13 extends, a non-fixed portion 16 to which the elastic member 13 and the two sheets 11 and 12 are not fixed is formed. The formation positions of the non-fixed portion 16 and the pleats 15 are the same. That is, the two sheets 11 and 12 located in the non-fixed portion 16 protrude in the direction away from each other, and the pleats 15 extending in the direction intersecting the direction in which the elastic member 13 extends are formed along the direction in which the elastic member 13 extends. plural lines. The non-fixed portion 16 has a specific length along the direction in which the elastic member 13 extends. The length of the non-fixed portion 16 corresponds to the complex It varies according to the degree of elongation of the telescopic member 10 . In detail, the greater the degree of elongation of the composite telescopic member 10, the longer the length of the non-fixed portion 16 is.

Similar to the non-fixed portion 16 , the fixed portion 14 also has a specific length along the direction in which the elastic member 13 extends. In the composite telescopic element 10 of the present embodiment, not only the non-fixed portion 16 but also the length of the fixed portion 14 changes according to the degree of elongation of the composite telescopic element 10 . In detail, the greater the degree of elongation of the composite telescopic member 10, the longer the length of the fixing portion 14 is. In contrast to this, the length of the fixing portion does not substantially change in the telescopic element known so far unless the telescopic element is greatly elongated. The fixing portion 14 in the composite telescopic element 10 of the present embodiment expands and contracts due to the expansion and contraction of the composite telescopic element 10, thereby producing the following various advantages.

4( a ) to ( c ) sequentially show the process of extending the composite telescopic member 10 of the present embodiment along the direction in which the elastic member 13 extends. In these figures, FIG. 4( a ) is a cross-sectional view in the thickness direction of the composite telescopic element 10 in a relaxed state (corresponding to the figure in FIG. 1 ). In the state shown in FIG. 4( a ), no external force is applied to the composite telescopic element 10 to extend it. The length of the fixed part 14 in this state is set to a1, and the length of the non-fixed part 16 is set to b1.

Fig. 4(b) shows a state in which the composite telescopic member 10 is slightly elongated along the direction in which the elastic member 13 extends from the state shown in Fig. 4(a). In the state shown in FIG. 4( b ), an external force to extend the composite telescopic element 10 is slightly applied. If the length of the fixed part 14 in this state is a2, and the length of the non-fixed part 16 is b2, a2>a1, b2>b1. That is, when the composite telescopic element 10 is slightly elongated, both the fixed portion 14 and the non-fixed portion 16 are elongated.

From the state shown in FIG. 4( b ), the composite telescopic member 10 is extended along the direction in which the elastic member 13 extends, and finally the state shown in FIG. 4( c ) is obtained. The state of the composite telescopic element 10 shown in Fig. 4(c) is the state in which the extension limit is reached. If the length of the fixed portion 14 in this state is a3 and the length of the non-fixed portion 16 is b3, a3>a2>a1, b3>b2>b1.

On the other hand, FIG. 5( a ) to ( d ) sequentially show the process of extending the conventionally known composite telescopic member 100 along the direction in which the elastic member 113 extends. In these figures, FIG. 5( a ) is a cross-sectional view in the thickness direction of the composite telescopic element 100 in a relaxed state. In the state shown in FIG. 5( a ), no external force is applied to the composite telescopic element 100 to extend it. The length of the fixed part 114 in this state is set to a1', and the length of the non-fixed part 116 is set to b1'.

FIG. 5( b ) shows a state in which the composite telescopic member 100 is slightly elongated along the direction in which the elastic member 113 extends from the state shown in FIG. 5( a ). In the state shown in FIG. 5( b ), an external force is slightly applied to the composite telescopic member 100 to elongate it. If the length of the fixed part 114 in this state is a2' and the length of the non-fixed part 116 is b2', then a2'=a1', and b2'>b1'. That is, even if the conventional composite telescopic member 100 is slightly elongated, the fixing portion 114 is not elongated.

When the composite telescopic element 100 is extended from the state shown in FIG. 5( b ) along the direction in which the elastic member 113 extends, the state shown in FIG. 5( c ) is obtained. The state shown in FIG. 5( c ) is a state when the composite telescopic element 100 is extended to a state close to the extension limit. When extended to this state, the fixing portion 114 starts to extend for the first time. The non-fixed portion 116 continues to expand. Therefore, the length a3' of the fixed portion 114 in the state shown in Fig. 5(c) satisfies the relationship of a3'>a2'=a1', and on the other hand, the length b3' of the non-fixed portion 116 satisfies b3'>b2' >b1' relationship.

From the state shown in FIG. 5( c ), the composite telescopic member 100 is extended along the direction in which the elastic member 113 extends, and finally the state shown in FIG. 5( d ) is obtained. The state of the composite telescopic element 100 shown in FIG. 5(d) is the state in which the extension limit is reached. If the length of the fixed part 114 in this state is a4', and the length of the non-fixed part 116 is b4', then a4'>a3'>a2'=a1', b4'>b3'>b2'> b1'.

In this way, the composite telescopic element 10 of the present embodiment is different from the previous composite telescopic element in that the distance between the fixed portion 14 and the non-fixed portion 16 is caused by a small tensile force from the initial state of its extension. In any aspect of elongation, the elongation characteristics are significantly different from those of the previous composite telescopic elements. Of course, if the tensile force of the fixed portion 14 and the non-fixed portion 16 in the extended state is released, the fixed portion 14 and the non-fixed portion 16 will shrink. Since the composite telescopic element 10 of the present embodiment has the inherent telescopic characteristics, the softness and cushioning feeling of the pleats 15 of the composite telescopic element 10 are further improved. In detail, even if the composite telescopic member 10 is stretched and the distance between the adjacent pleats 15 is stretched, due to the extensibility of the fixing portion 14 , the contraction force to return to the length before the expansion acts. Therefore, the distance between the adjacent pleats 15 is The distance also shrinks. As a result, even if an external force is applied to the pleats 15 when the composite telescopic member 10 is stretched and the pleats 15 are collapsed, the pleats 15 in the collapsed state can also hang from another adjacent pleat 15, so that the pleats 15 have softness or cushioning feeling. Not easily damaged.

In the composite telescopic member 10 of the present embodiment, in terms of maintaining flexibility or cushioning even when an external force is applied to the composite telescopic member 10, it is preferable to make the composite elastic member 10 follow the elastic member. When the direction in which 13 extends, both the fixed portion 14 and the non-fixed portion 16 are stretched with a small tensile force as described above, and the extent of these stretches is as follows. That is, it is preferable that the elongation of the fixed portion 14 is lower than the elongation of the non-fixed portion 16 when the composite telescopic element 10 is stretched by 25% from its relaxed state. Further, the composite telescopic element 10 preferably has a difference (E-E1) between the elongation rate E of the composite telescopic element 10 and the elongation rate E1 of the fixing portion 14 in a state where it is stretched by 25% from its relaxed state, and The difference (E-E2) between the elongation E2 of the composite telescopic member 10 and the elongation E2 of the non-fixed portion 16 is an elongation degree within ±15%, respectively. By providing the fixed portion 14 and the non-fixed portion 16 with such extensibility, the non-fixed portion 16 is easily contracted together with the fixed portion 14 in the relaxed state of the composite telescopic element 10, and as a result, the length of the fixed portion 14 is less than slack. The state is shorter than the stretched state. Thereby, even if an external force is applied to the pleat 15 and the pleat 15 is collapsed, the pleat 15 in the collapsed state can hang from another adjacent pleat 15, Therefore, the softness or cushioning feeling of the pleats 15 is not easily damaged. Furthermore, it is more preferable to have the elongation ratio of the composite telescopic element 10 when the composite telescopic element 10 is elongated by 25% or more from its relaxed state, that is, in all the elongation regions from the state of elongation of 25% to the elongation limit state. The difference (E-E1) between E and the elongation E1 of the fixed portion 14 and the difference (E-E2) from the elongation E2 of the non-fixed portion 16 are respectively within ±15% of elongation. Furthermore, from the viewpoint of making this effect more remarkable, it is further preferable to have the elongation E of the composite telescopic element 10 and the elongation of the fixing portion 14 in a state where the composite telescopic element 10 is stretched by 25% from its relaxed state The difference between E1 (E-E1) and the difference between the elongation E2 of the non-fixed portion 16 (E-E2) are respectively within ±14% of elongation, and more preferably within ±13%. degree of elongation. Furthermore, it is more preferable to have the composite telescopic element 10 when the composite telescopic element 10 is elongated by 25% or more from its relaxed state, that is, in all the elongation regions from the state in which the composite telescopic element 10 is elongated by 25% to the elongation limit state, the composite telescopic element 10 at this time. The difference between the elongation E of the telescopic member 10 and the elongation E1 of the fixed part 14 (E-E1) and the difference (E-E1) from the elongation E2 of the non-fixed part 16 are respectively the elongation within ±14%. degree, and more preferably, it has an elongation degree within ±13%.

The elongation of the composite telescopic element 10 and the elongation of the fixed portion 14 and the non-fixed portion 16 are defined by the following equations.

Elongation (%) = (length after elongation - length before elongation) / length before elongation × 100

Therefore, elongation to 1.5 times, for example, has the same meaning as the case of elongation so that the elongation rate becomes 50%.

In particular, if the elongation of the fixing portion 14 when the composite telescopic member 10 is elongated by 25% is set to E1 ₂₅ (%), the value of (25-E1 ₂₅ ) is preferably 15% or less, more preferably 14% Hereinafter, it is more preferably 13% or less. The closer the value of (25-E1 ₂₅ ) is to zero, the better. By making the elongation ratio of the fixing portion 14 as described above, the fixing portion 14 can be easily stretched even with a small tensile force.

Moreover, if the elongation of the non-fixed portion 16 when the composite telescopic member 10 is elongated by 25% is set to E2 ₂₅ (%), the value of (25-E2 ₂₅ ) is preferably -15% or more, and more preferably -14% or more, more preferably -13% or more. The closer the value of (25-E2 ₂₅ ) is to zero, the better.

The cross-sectional shape in the thickness direction of the composite telescopic element 10 is shown in FIG. 4( a ), and the two sheets 11 and 12 are swelled in the direction away from each other to form an arc shape. Therefore, the space S is formed by dividing and forming the two sheets 11 and 12 . When the composite telescopic element 10 is elongated from the state shown in FIG. 4( a ), the inclination of the arc gradually becomes gentle, and the cross-sectional area of the space S gradually changes accordingly. The inventors have examined the relationship between the cross-sectional area and the elongation of the composite telescopic member 10, and found that the cross-sectional area increases as the elongation increases, and the cross-sectional area reaches a peak value at a certain elongation value. , when the elongation further increases, the cross-sectional area turns into a decrease. As a result of further studies, the inventors of the present invention found that the composite elastic member 10 in which peaks were observed in the cross-sectional area when the elongation was within 50% had a particularly soft touch and improved air permeability.

Regarding the elongation of the fixed portion 14 and the non-fixed portion 16 , the elongation ratio E1 of the fixed portion 14 is lower than the elongation ratio E2 of the non-fixed portion 16 . That is, E1<E2. This relationship is preferably established when the composite telescopic member 10 is elongated by 25% from its relaxed state, and more preferably is established when the composite telescopic member 10 is at any elongation rate. E1 is defined by ( _aS - _aN )/ _aN ×100. E2 is defined by ( _{bS-bN)/bN × 100} . a _S and b _S represent the lengths of the fixed portion 14 and the non-fixed portion 16 in an extended state extended by a specific tensile force, and a _N and b _N represent the lengths of the fixed portion 14 and the non-fixed portion 16 in a relaxed state.

a之關係。所謂複合伸縮構件10之伸長極限狀態，係使複合伸縮構件10沿著彈性構件13所延伸之方向伸長並達到伸長極限之狀態。所謂伸長極限， 係自複合伸縮構件10將彈性構件13去除而僅將片材11、12分離，經分離之片材11、12不會進一步伸長之狀態下之長度。就即便於對複合伸縮構件10施加外力之情形時亦維持柔軟性或緩衝感之方面而言，如上所述般設定固定部14及非固定部16之長度關係極其有利。詳細而言，藉由使固定部14之長度a、及非固定部16之長度b滿足(1/2)b≧a之關係，即便於複合伸縮構件10伸長至接近伸長極限之狀態下對褶皺15施加外力而褶皺15倒伏，處於倒伏狀態之褶皺15亦可垂掛於鄰接之另一褶皺15，因此，褶皺15之柔軟性或緩衝感不易受損。就使該效果進一步顯著之觀點而言，固定部14之長度a、及非固定部16之長度b之關係較佳為(1/2.5)b≧a，進而較佳為(1/3)b≧a。 The composite telescopic member 10 satisfies (1/2)b when the length of the fixed portion 14 in the direction in which the elastic member 13 extends is set as a and the length of the non-fixed portion 16 as b in the extension limit state.

a relationship. The so-called extension limit state of the composite telescopic element 10 is a state in which the composite telescopic element 10 is elongated along the direction in which the elastic member 13 extends and reaches the extension limit. The elongation limit is the length in a state where the elastic member 13 is removed from the composite telescopic member 10 and only the sheets 11 and 12 are separated, and the separated sheets 11 and 12 are not extended further. Setting the length relationship between the fixed portion 14 and the non-fixed portion 16 as described above is extremely advantageous in terms of maintaining flexibility or a cushioning feeling even when an external force is applied to the composite telescopic member 10 . Specifically, by making the length a of the fixed portion 14 and the length b of the non-fixed portion 16 satisfy the relationship of (1/2)b≧a, even when the composite telescopic element 10 is stretched to a state close to the elongation limit, the wrinkle When the fold 15 is collapsed by applying external force, the fold 15 in the collapsed state can also hang from another adjacent fold 15, so the softness or cushioning feeling of the fold 15 is not easily damaged. From the viewpoint of making this effect more remarkable, the relationship between the length a of the fixed portion 14 and the length b of the non-fixed portion 16 is preferably (1/2.5)b≧a, and more preferably (1/3)b ≧a.

In addition, the length of each fixing part 14 formed in the composite expansion-contraction element 10 of this embodiment may all be the same, or may differ. Likewise, the lengths of the non-fixed portions 16 formed in the composite telescopic element 10 may all be the same, or may be different. When the lengths of the fixed parts 14 are different and/or the lengths of the non-fixed parts 16 are different, it is determined whether the above relationship is satisfied by focusing on the adjacent fixed parts 14 and the non-fixed parts 16 .

The length of the fixing portion 14 in the direction in which the elastic member 13 extends under the extension limit state of the composite telescopic member 10, that is, the length a (=a3) of the fixing portion 14 in the state shown in FIG. 4( c ) is preferably 0.01 mm or more, more preferably 0.1 mm or more, still more preferably 0.2 mm or more. Moreover, 1 mm or less is preferable, 0.9 mm or less is further more preferable, and 0.8 mm or less is further more preferable. Specifically, the length a of the fixing portion 14 is preferably 0.01 mm or more and 1 mm or less, more preferably 0.1 mm or more and 0.9 mm or less, and still more preferably 0.2 mm or more and 0.8 mm or less. By making the length a of the fixing|fixed part 14 into this range, the pleat 15 becomes soft, and the air permeability of the pleat 15 becomes favorable. On the composite telescopic member 10, on the side where the elastic member 13 extends When a plurality of fixing portions 14 are arranged upward, the length a of the fixing portions 14 refers to the respective lengths of the fixing portions 14 .

On the other hand, the length of the non-fixed portion 16 in the direction in which the elastic member 13 extends in the extension limit state of the composite telescopic member 10, that is, the length b of the non-fixed portion 16 in the state shown in FIG. 4( c ) ( =b3) On the condition that a and b satisfy the above relationship, it is preferably 1.5 mm or more, more preferably 1.75 mm or more, and still more preferably 2.0 mm or more. Moreover, 5.0 mm or less is preferable, 4.0 mm or less is more preferable, and 3.0 mm or less is further more preferable. Specifically, the length b of the non-fixed portion 16 is preferably 1.5 mm or more and 5.0 mm or less, more preferably 1.75 mm or more and 4.0 mm or less, and still more preferably 2.0 mm or more and 3.0 mm or less. By making the length b of the non-fixed part 16 into this range, the pleat 15 becomes thin, and the external appearance of the pleat 15 becomes favorable. When a plurality of non-fixed portions 16 are arranged in the direction in which the elastic member 13 extends in the composite telescopic member 10, the length b of the above-mentioned non-fixed portion 16 refers to a non-fixed portion located between the fixed portions 14 and 14. 16 respective lengths.

From the viewpoint of further improving the flexibility and cushioning feeling of the composite telescopic element 10, the thickness of the composite telescopic element 10 in a relaxed state and under a load of 0.5 gf/cm ² is preferably 2 mm or more, and more preferably 2.1 mm or more. , more preferably 2.2 mm or more. Moreover, 4 mm or less is preferable under the load of 0.5gf/cm< ² >, 3.5 mm or less is further more preferable, and 3 mm or less is further more preferable. Specifically, the thickness of the composite telescopic member 10 is preferably 2 mm or more and 4 mm or less, more preferably 2.1 mm or more and 3.5 mm or less, and still more preferably 2.2 mm or more in a relaxed state under a load of 0.5 gf/cm ² . and 3mm or less.

As described above, the composite telescopic member 10 can maintain the softness or cushioning feeling brought by the pleats 15 even when an external force is applied to the pleats 15 . From this viewpoint, the thickness of the composite telescopic member 10 in the relaxed state under a load of 50 gf/cm ² is preferably 20% or more of the thickness under a load of 0.5 gf/cm ² in the relaxed state, and more preferably 30%. Above, more preferably 50% or more. The upper limit of the value is not particularly limited, and the larger the better, if the value is as large as about 70%, even when an external force is applied to the wrinkles 15, the softness or cushioning feeling brought by the wrinkles 15 can be sufficiently maintained.

The thickness of the composite telescopic member 10 was measured under the above-mentioned load using KES-FB3-AUTO-A of Jiaduo Technology Co., Ltd.

The elastic member 13 in the composite telescopic element 10 is used to impart stretchability to the composite telescopic element 10 . Moreover, the elastic member 13 is used to form a plurality of pleats 15 in the composite elastic member 10 . From the viewpoint of smoothly forming the pleats 15 with good appearance, it was found that it is important to appropriately set the relationship between the thickness of the elastic member 13 and the length of the fixing portion 14 . From this viewpoint, when the thickness of the elastic member 13 is T (dtex) and the length of the fixing portion 14 is a (mm), the value of T/a is preferably 10 or more, and more preferably 150 or more, more preferably 300 or more. Moreover, the value of T/a is preferably 40,000 or less, more preferably 20,000 or less, and still more preferably 8,000 or less. Specifically, the value of T/a is preferably 10 or more and 40,000 or less, more preferably 150 or more and 20,000 or less, still more preferably 300 or more and 8,000 or less. The value of a is the value measured at the limit state of elongation of the composite telescopic element 10 as described above. The value of T is the value measured when the elastic member 13 is removed from the composite telescopic member 10 and in the relaxed state of the removed elastic member 13 .

As the two sheets 11 and 12 constituting the composite telescopic element 10, various nonwoven fabrics, films, and the like can be used. The two sheets 11 and 12 may be the same or different. As the nonwoven fabric, for example, a spunbond nonwoven fabric, a hot air nonwoven fabric, a spunlace nonwoven fabric, a meltblown nonwoven fabric, and the like can be used. Arbitrary 2 or more types of laminated bodies of these nonwoven fabrics can also be used.

When the sheets 11 and 12 are non-woven fabrics, the basis weights of the non-woven fabrics are independently preferably 13 g/m ² or more, more preferably 15 g/m ² or more, and still more preferably 17 g/m ² or more. Moreover, it is preferably 25 g/m ² or less, more preferably 23 g/m ² or less, and still more preferably 21 g/m ² or less. As the fibers constituting the nonwoven fabric, various thermoplastic resins can be used. Fibers containing a combination of two or more thermoplastic resins can also be used. The thickness of the fibers constituting the nonwoven fabric is preferably approximately 1 dtex or more and 10 dtex or less.

When at least one of the sheets 11 and 12 is a non-woven fabric, as shown in Fig. 6(a), it can be processed by densification with or without heat, that is, a so-called embossing process. At least one of the sheets 11 and 12 including the nonwoven fabric forms a plurality of embossed portions 20 . The embossed portion 20 preferably has a concave shape with a bottom surface of a specific area. The shape of the bottom surface is not particularly limited, for example, it may be circular, or it may be non-circular such as square, rectangle, rhombus, or polygon. The embossed portion 20 is formed, for example, by feeding the sheet between a pair of rollers that rotate in opposite directions, and pressing the sheet by a plurality of protrusions provided on the outer peripheral surface of at least one of the rollers. The other roll may be a smooth roll whose peripheral surface is smooth. It is preferable to heat at least one of a pair of rolls in order to improve the fusion property of the constituent fibers during extrusion.

As shown in FIG. 6( a ), the embossed portions 20 are preferably arranged in a manner that a plurality of embossed portions are arranged at a specific pitch P to form a row of embossed portions 21 formed in the direction X in which the elastic member extends. The embossed portion row 21 is formed with a plurality of rows side by side in a direction orthogonal to the direction X in which the elastic member extends. The embossed portion row 21 is preferably formed in a manner to extend parallel to the direction X in which the elastic member extends, but it is not necessarily required to be parallel, and the direction X in which the elastic member extends and the direction in which the embossed portion row 21 extends are also allowed to be formed. The composition of the intersection in an angle within 15°.

The plurality of embossed portions 20 may be arranged in a zigzag lattice shape as shown in FIG. 6( a ), for example, or may be arranged in a lattice mesh shape as shown in FIG. 6( b ). In the configuration shown in FIG. 6( a ), among the rows of embossed portions 21 adjacent to each other in the direction orthogonal to the direction X in which the elastic member extends, the position of the embossed portion 20 is at the position where the elastic member 13 extends. The distance P is generally staggered in the direction X. Furthermore, the embossed portion 20 is also As shown in FIG. 6( c ), in the embossed portion row 21 formed in one sheet, the distance between the embossings can be arranged in a manner of taking plural values P1, P2, ‧‧.

As shown in FIG. 7 , the distance P between the embossed portions 20 in the embossed portion row 21 is preferably smaller than the length a of the fixed portion 14 when the composite telescopic member is in the elongation limit state, that is, a>P. Furthermore, as in the pattern shown in FIG. 6( c ), there are embossed portion rows 21 having a pitch P1 between embossed portions 20 and embossed portion rows having a pitch P2 between embossed portions 20 having a value different from the pitch P1 In the case of 21, the distance between the embossed parts 20 in at least a part of the embossed part rows 21 has a relationship of a>P, that is, the relationship of a>P1 or a>P2, more preferably all the embossed part rows 21. The distance between the embossed portions 20 has the relationship of a>P, that is, the relationship of a>P1 and a>P2. By setting the distance P between the fixed portion 14 and the embossed portion 20 in the above relationship, the fixed portion 14 and the embossed portion 20 overlap in the direction X in which the elastic member (not shown) extends, so that the sheets 11 and 12 can be increased. The bonding strength between each other or between the sheets 11 and 12 and the elastic member can maintain good softness or cushioning even when external force is applied. In addition, like FIG. 2, FIG. 7 is a cross-sectional view when the composite telescopic element is in an extension limit state.

Moreover, as shown in FIG. 7, it is preferable to arrange|position the embossed part 20 in the non-fixed part 16 in at least a part of the embossed part row 21 in the sheets 11 and 12. By arranging the embossed portion 20 on the non-fixed portion 16, the rigidity of the non-fixed portion 16 is locally increased as compared with the case where the embossed portion 20 is not arranged. As a result, the embossed portion 20 becomes an inflection point, and the sheets 11 and 12 are easily deformed into an arc shape (see FIG. 1 ), so that regular wrinkles are easily formed. Furthermore, it is more preferable to arrange a plurality of embossed portions 20 on one non-fixed portion 16 in the direction X in which the elastic member extends. By arranging a plurality of embossed portions 20 on one non-fixed portion 16 in the direction X in which the elastic member extends, the sheets 11 and 12 are easily deformed into an arc shape more neatly. Preferably, in all the embossed portion rows 21 in any one of the sheet 11 and the sheet 12, the embossed portion 20 is arranged in the non-fixed portion 16, and more preferably in the sheet 11 and the sheet 12. In all the embossed portion rows 21 , embossed portions 20 are arranged on the non-fixed portion 16 . Moreover, it is preferable to be between the sheet material 11 and the sheet material 12 In all the embossed portion rows 21 in any sheet, a plurality of embossed portions 20 are arranged in one non-fixed portion 16, more preferably in all the embossed portion rows 21 of the sheet 11 and the sheet 12, all of which are A plurality of embossed portions 20 are arranged on one non-fixed portion 16 .

As the elastic member 13, a stretchable material such as natural rubber, urethane-based resin, foamed urethane-based resin, and hot-melt-based expansion-contraction member is preferably formed into a thread (rubber thread) or a belt It is also possible to use a linear shape (rubber belt) including various elastomer materials. As an elastomer material, although a styrene-butadiene-styrene elastomer etc. are mentioned, for example, it is not limited to this.

The composite expansion-contraction member 10 can be suitably manufactured by the following method. That is, while the sheet 11 is being conveyed, the hot-melt adhesive is intermittently applied in the conveying direction in a specific application pattern to the area where the elastic members 13 are arranged on one surface of the sheet 11 . At this time, the hot-melt adhesive may be applied not only to the area where the elastic members 13 are to be arranged, but also to be applied between a plurality of elastic members 13 so as to be continuous along the direction orthogonal to the conveying direction. Extended pattern coating. Next, the elastic member 13 is disposed in the above-mentioned area where the hot-melt adhesive is coated, and the elastic member 13 is then covered with the sheet material 12, and the three are pressed together by a nip roller, and the three are bonded together. Although the adhesive agent is not applied to the sheet 12, the adhesive applied to the sheet 11 side moves a little to the sheet 12 side by sticking. Adhesives are present for weeks. As a result, the sheets 11 and 12 are joined with the elastic member 13 interposed therebetween. Of course, the bonding force between the sheet 11 and the elastic member 13 and the bonding force between the sheet 12 and the elastic member 13 are different depending on the amount of adhesive present, and the bonding force between the sheet 11 and the elastic member 13 is higher than that between the sheet 12 and the elastic member 13. The engagement force of the elastic member 13 . In this way, by applying the hot-melt adhesive to one surface of the sheet 11 , in the obtained composite stretchable member 10 , not only the non-fixed portion 16 but also the fixed portion 14 is given stretchability.

The composite telescopic element 10 obtained in the above manner is used for various articles requiring elasticity. For example, the composite stretchable member 10 can be applied to a portion requiring stretchability in a pant-type or flap-type disposable diaper. Such a disposable diaper has, for example, an absorptive main body and an exterior body arranged on the non-skin-opposing surface side thereof. In addition, the composite telescopic element 10 may be arranged in a part of the exterior body. In the disposable diaper of this structure, printing can be performed on the skin-opposite surface side in the sheet outer casing that constitutes the outermost surface of the diaper. By this printing, the appearance of the diaper can be further improved. For example, the diaper can be made into a panty-like appearance. The printing becomes clearer by applying the composite telescopic element 10 to the part where the printing is performed. Moreover, by performing printing on the skin-opposing surface side, even if the diaper rubs against the clothing, the printed ink is prevented from being stained on the clothing.

As mentioned above, although this invention was demonstrated based on preferable embodiment, this invention is not limited to the said embodiment. For example, the composite telescopic member of the present invention has two sheets and a plurality of elastic members sandwiched therebetween as a basic structure, and other than that, for example, at least one of the sheets 11 and 12 may have a surface area layer of 1 or more. Sheet.

In addition, the composite telescopic member of the present invention can be applied not only to disposable diapers, but also to other articles such as masks, cleaning sheets, bandages, and the like.

Regarding the above-mentioned embodiment, the present invention further discloses the following composite elastic members and disposable diapers.

<1>

A composite telescopic member, which is provided with two sheets and a plurality of elastic members extending along one direction between the two sheets, and which can be stretched and contracted along the one direction, extend along the elastic members There are intermittently a plurality of fixing parts for fixing the elastic member and the two sheets in the direction of the elastic member, and between the adjacent fixing parts along the direction in which the elastic member extends, there is no elastic member and the two sheets. the non-fixed portion to which the above-mentioned sheet is fixed, The two sheets located in the non-fixed portion protrude in the direction away from each other, and the pleats extending in the direction intersecting the direction in which the elastic member extends are formed in a plurality of rows along the direction in which the elastic member extends. When the composite telescopic element is stretched by 25% from its relaxed state, the difference between the elongation of the composite telescopic element and the elongation of the fixed part, and the difference between the elongation of the composite telescopic element and the elongation of the non-fixed part The difference is within ±15%, respectively.

<2>

The composite telescopic member according to the above <1>, wherein a plurality of the elastic members are arranged at intervals in the direction intersecting the direction in which the elastic members extend, and the interval between the adjacent elastic members is preferably 0.5 mm more preferably 0.75 mm or more, more preferably 1 mm or more, and more preferably 3 mm or less, still more preferably 2.5 mm or less, still more preferably 2 mm or less, and the interval is preferably 0.5 mm or more and 3 mm Hereinafter, it is more preferably 0.75 mm or more and 2.5 mm or less, and still more preferably 1 mm or more and 2 mm or less.

<3>

The composite telescopic member according to the above <1> or <2>, wherein the two sheets and the elastic member are fixed by bonding with an adhesive, thermal fusion, or bonding with ultrasonic vibration.

<4>

The composite telescopic member according to any one of the above <1> to <3>, wherein in the fixing portion, the two sheets and the elastic member are fixed by bonding with an adhesive.

<5>

The composite telescopic member according to the above <4>, wherein the adhesive is continuously extended and arranged in a direction intersecting the direction in which the elastic members extend so as to straddle each elastic member.

<6>

The composite telescopic element according to any one of the above <1> to <5>, wherein in a state where the composite telescopic element is elongated by 25% from its relaxed state, the elongation of the fixed portion is lower than that of the non-fixed portion Rate.

<7>

The composite telescopic element according to any one of the above <1> to <6>, wherein in a state where the composite telescopic element is elongated by 25% from its relaxed state, the elongation of the composite telescopic element and the elongation of the fixed portion The difference and the difference between the elongation of the composite telescopic member and the elongation of the non-fixed portion are respectively within ±14%.

<8>

The composite telescopic element according to any one of the above <1> to <7>, which has the elongation rate of the composite telescopic element and the elongation of the fixed portion in a state where the composite telescopic element is elongated by 25% from its relaxed state The difference between the ratios and the difference between the elongation of the composite telescopic member and the elongation of the non-fixed portion are preferably within ±13%, respectively.

<9>

The composite telescopic element according to any one of the above <1> to <8>, which has all the elongation regions from the state where the composite telescopic element is stretched by 25% from its relaxed state to the elongation limit state, the composite telescopic element has The difference between the elongation and the elongation of the above-mentioned fixed part, and the difference between the elongation of the composite telescopic member and the elongation of the above-mentioned non-fixed part are respectively within ±15% of the degree of elongation, preferably with ± The degree of elongation is within 14%, and more preferably, the degree of elongation is within ±13%, respectively.

<10>

The composite telescopic element according to any one of the above <1> to <9>, wherein the length of the fixed portion is set to a under the limit state of elongation of the composite telescopic element, and the fixed portion will be located at the fixed portion. When the length of the above-mentioned non-fixed portion is set as b, the relationship of (1/2)b≧a is satisfied, preferably the relationship of (1/2.5)b≧a is satisfied, and the relationship of (1/3) is more preferably satisfied. The relationship between b≧a.

<11>

The composite telescopic member according to any one of the above <1> to <10>, wherein in the extension limit state of the composite telescopic member, the length of the fixing portion in the direction in which the elastic member extends is preferably 0.01 mm or more and 1 mm or less, more preferably 0.1 mm or more and 0.9 mm or less, and still more preferably 0.2 mm or more and 0.8 mm or less.

<12>

The composite telescopic member according to any one of the above <1> to <11>, wherein in the extension limit state of the composite telescopic member, the length of the non-fixed portion in the direction in which the elastic member extends is preferably 1.5 mm It is more than 5.0 mm, more preferably, it is 1.75 mm or more and 4.0 mm or less, and it is still more preferably 2.0 mm or more and 3.0 mm or less.

<13>

The composite telescopic element according to any one of the above <1> to <12>, wherein the thickness in a relaxed state and under a load of 0.5 gf/cm ² is preferably 2 mm or more and 4 mm or less, more preferably 2.1 mm or more and 3.5 mm mm or less, more preferably 2.2 mm or more and 3 mm or less.

<14>

The composite telescopic element according to any one of the above <1> to <13>, wherein the thickness in a relaxed state and under a load of 50 gf/cm ² is preferably 20% or more of the thickness in a relaxed state and under a load of 0.5 gf/cm ² , more preferably 30% or more, still more preferably 50% or more.

<15>

The composite telescopic member according to any one of the above <1> to <14>, wherein the thickness of the elastic member is set as T(dtex), and the upper limit state of the elongation limit of the composite telescopic member is When the length of the fixing portion in the direction in which the elastic member extends is set to a (mm), the value of T/a is preferably 10 or more, more preferably 150 or more, further preferably 300 or more, and more preferably It is 40000 or less, more preferably 20000 or less, more preferably 8000 or less, and the value of T/a is preferably 10 or more and 40000 or less, more preferably 150 or more and 20000 or less, still more preferably 300 or more and 8000 the following.

<16>

The composite telescopic element according to any one of the above <1> to <15>, wherein at least one of the two sheets is a non-woven fabric, and the basis weight of the non-woven fabric is preferably 13 g/m ² or more, and more preferably 15 g/m m ² or more, more preferably 17 g/m ² or more, more preferably 25 g/m ² or less, still more preferably 23 g/m ² or less, still more preferably 21 g/m ² or less.

<17>

The composite telescopic member according to any one of the above <1> to <16>, wherein a plurality of rows are arranged side by side in the direction in which the elastic members extend. A fixed part row of the above fixed part.

<18>

The composite telescopic element according to any one of the above <1> to <17>, wherein at least one of the two sheets includes a nonwoven fabric and has a plurality of embossed portions.

<19>

The composite telescopic member according to the above <18> has a plurality of rows side by side in a direction perpendicular to the direction in which the elastic members extend, and a plurality of the pressure elements are arranged side by side at a specific distance in the direction in which the elastic members extend. The embossed part of the embossed part is row.

<20>

The composite telescopic element according to the above-mentioned <19>, wherein on at least a part of the above-mentioned sheets In the row of the embossed portions, the distance between the embossed portions is smaller than the length of the fixed portion in the extension limit state.

<21>

The composite telescopic element according to the above <19> or <20>, wherein the embossed portion is disposed in the non-fixed portion in at least a part of the embossed portion row in the sheet.

<22>

記載之複合伸縮構件，其中於上述片材中之至少一部分上述壓紋部行中，於一個上述非固定部配設有複數個上述壓紋部。 As above <21>

The composite telescopic element according to the description, wherein a plurality of the embossed portions are arranged in one of the non-fixed portions in at least a part of the embossed portion rows in the sheet.

<23>

The composite telescopic member according to any one of the above <19> to <22>, wherein in all the rows of the embossed portions in the sheet material, the distance between the embossed portions is smaller than the elongation in the direction in which the elastic member extends The length of the above-mentioned fixed part in the limit state.

<24>

The composite telescopic element according to any one of the above <19> to <23>, wherein the embossed portion is disposed in the non-fixed portion in all of the embossed portion rows in the sheet.

<25>

The composite telescopic element according to the above-mentioned <24>, wherein a plurality of the above-mentioned embossed parts are arranged in one of the above-mentioned non-fixed parts in all of the above-mentioned embossed part rows in the above-mentioned sheet.

<26>

A composite telescopic member, which is provided with two sheets and a plurality of elastic members extending along one direction between the two sheets, and which can be stretched and contracted along the one direction, extend along the elastic members There are a plurality of fixing parts for fixing the elastic member and the two sheets of the above-mentioned sheet material intermittently in the direction of the Between the adjacent fixed portions along the direction in which the elastic member extends, there is a non-fixed portion that is not fixed to the elastic member and the two sheets, and the two sheets located in the non-fixed portion face each other. Protruding in a direction away from, and extending in a direction intersecting with the direction in which the elastic member extends, a plurality of rows are formed along the direction in which the elastic member extends, and at least one of the two sheets has a plurality of embossed portions, In the direction perpendicular to the extending direction of the elastic member, there are a plurality of rows arranged side by side in the direction in which the elastic member extends, and a plurality of rows of the embossed portions are arranged side by side at a specific interval in the direction in which the elastic member extends. In at least a part of the row of the embossed portions in the material, the distance between the embossed portions is smaller than the length of the fixed portion in the limit state of elongation in the direction in which the elastic member extends.

<27>

The composite telescopic element according to the above <26>, wherein the embossed portion is disposed in the non-fixed portion in at least a part of the embossed portion row in the sheet.

<28>

The composite telescopic element according to the above <27>, wherein a plurality of the embossed portions are arranged in one of the non-fixed portions in at least a part of the embossed portion row in the sheet.

<29>

The composite telescopic element according to any one of the above <26> to <28>, wherein in all the rows of the embossed portions in the sheet material, the distance between the embossed portions is smaller than the length of the fixed portion in an elongation limit state .

<30>

The composite telescopic element according to any one of the above <26> to <29>, wherein the embossed portion is disposed in the non-fixed portion in all of the embossed portion rows in the sheet.

<31>

The composite telescopic element according to the above <29>, wherein a plurality of the above-mentioned embossed parts are arranged in one of the above-mentioned non-fixed parts in all of the above-mentioned embossed part rows in the above-mentioned sheet.

<32>

A disposable diaper including the composite elastic member according to any one of the above <1> to <31>.

<33>

The disposable diaper according to the above <31>, which has an absorbent body and an outer body disposed on the non-skin-opposing surface side, wherein the composite stretchable member constitutes a part of the outer body, and the composite stretchable member constitutes a part of the outer body. Printing is performed on the skin-opposite side of the outermost sheet.

[Example]

Hereinafter, the present invention will be described in further detail by way of examples. However, the scope of the present invention is not limited by this embodiment.

[Example 1]

A spunbond nonwoven comprising polypropylene fibers with a fineness of about 1 dtex was used as the sheet. The basis weight of the nonwoven fabric was 18 g/m ² . Two sheets of the non-woven fabrics were used, and a hot-melt adhesive was intermittently applied to a predetermined area of the rubber thread on one surface of one of the non-woven fabrics. The hot melt adhesive was applied at a coating weight of 20 g/m ² . Next, 100 rubber threads having a thickness of 155 dtex were arranged in a state of being stretched to 150% in the area where the hot melt adhesive was applied. The distance between adjacent rubber lines was set to 2 mm. The rubber thread contains a styrene-butadiene-styrene elastomer. Cover it with another non-woven fabric, and press the three with a nip roller to fit them together. The details of the composite telescopic element obtained in the above manner are shown in Table 1 below.

[Comparative Example 1]

In Example 1, a hot-melt adhesive (20 g/m ^{2 in total) was applied on the opposite surfaces of the two nonwoven fabrics with a coating weight of 10 g/m 2 .} Except for this, a composite telescopic member was obtained in the same manner as in Example 1.

[evaluate]

For the composite telescopic members obtained in Examples and Comparative Examples, marks were attached to any positions of the elastic members with a pen, and the lengths in the relaxed state were measured. Next, the lengths of the fixed portion and the non-fixed portion at the time of elongation at a specific elongation ratio were measured, and the elongation ratio was calculated. Furthermore, the cross-sectional area of the space S in the composite elastic member when viewed in the thickness direction was measured, and the elongation of the composite elastic member when the cross-sectional area was the peak value was obtained. The difference between the elongation of the composite telescopic member obtained in the examples and the elongation of the fixed part and the difference with the elongation of the non-fixed part are ± when the elongation is 25%, the elongation is 50%, and the elongation is 75%. within 15%. On the other hand, the difference between the elongation ratio of the composite telescopic member obtained in the comparative example and the elongation ratio of the fixing portion exceeded 15% at 25% elongation, 50% elongation, and 75% elongation. Furthermore, the softness|flexibility of a composite expansion-contraction member was sensory-evaluated with the sample number N=5. These results are shown in Table 1 below. In addition, the sensory evaluation was performed according to the following criteria, the average score was calculated, and the evaluation was performed based on the following criteria based on the average score.

5 points: Soft touch.

4 points: The touch is slightly soft.

3 points: The feel is not good or not.

2 points: The hand feeling is slightly poor.

1 point: The hand feeling is poor.

A: The average score is more than 4 points

B: The average score is more than 3 points and less than 4 points

C: The average score is more than 2 points and less than 3 points

D: The average score is less than 2 points

From the results shown in Table 1, it was clearly judged that the composite telescopic elements obtained in the respective Examples were superior in flexibility as compared with the composite telescopic elements of the comparative examples.

[Industrial Availability]

According to the present invention, there is provided a composite telescopic member having good flexibility or cushioning even when an external force is applied.

10: Composite telescopic elements

11: Sheet

12: Sheet

13: Elastic components

14: Fixed part

15: Folds

16: Non-fixed part

a1: length

a2: length

a3: length

b1: length

b2: length

b3: length

S: space

Claims (32)

A composite telescopic member, which is provided with two sheets, and a plurality of elastic members extending along one direction disposed between the two sheets, and which can be stretched and contracted along the one direction, extending along the elastic members There are a plurality of fixing parts that fix the elastic member and the two sheets of the above-mentioned sheet material intermittently in the direction of the above-mentioned elastic member, and between the above-mentioned fixing parts adjacent to the direction in which the above-mentioned elastic member extends, there is no elastic member and the two sheets. The non-fixed portion where the sheet is fixed, the two sheets located in the non-fixed portion protrude in a direction away from each other, and the pleats extending in a direction intersecting with the direction in which the elastic member extends along the elastic member. A plurality of rows are formed in the direction of the composite telescopic element, and the difference between the elongation rate of the composite telescopic element and the elongation rate of the fixed portion, and the elongation rate of the composite telescopic element in the state where the composite telescopic element is stretched by 25% from its relaxed state The difference from the elongation of the above-mentioned non-fixed portion is within ±15%, respectively. The composite telescopic member according to claim 1, wherein a plurality of the elastic members are arranged at intervals in the direction intersecting the direction in which the elastic members extend, and the interval between the adjacent elastic members is 0.5 mm or more and 3 mm or less. The composite telescopic element according to claim 1, wherein when the composite telescopic element is elongated by 25% from its relaxed state, the elongation of the fixed portion is lower than the elongation of the non-fixed portion. The composite telescopic element of claim 1, wherein in a state where the composite telescopic element is elongated by 25% from its relaxed state, the difference between the elongation rate of the composite telescopic element and the elongation rate of the fixed portion, and the composite telescopic element The difference between the elongation and the elongation of the above-mentioned non-fixed part is respectively within ±14%. The composite telescopic element of claim 1, wherein in a state where the composite telescopic element is elongated by 25% from its relaxed state, the difference between the elongation rate of the composite telescopic element and the elongation rate of the fixed portion, and the composite telescopic element The difference between the elongation and the elongation of the above-mentioned non-fixed part is respectively within ±13%. The composite telescopic element of claim 1, wherein in all the elongation regions of the composite telescopic element from a state where the composite telescopic element is stretched by 25% from its relaxed state to an elongation limit state, the elongation rate of the composite telescopic element and the elongation rate of the fixed portion are The difference and the difference between the elongation of the composite telescopic member and the elongation of the non-fixed portion are respectively within ±15%. The composite telescopic element according to claim 1, wherein when the length of the fixed portion is set as a and the length of the non-fixed portion located between the fixed portions is set as b under the limit state of elongation of the composite telescopic member, it satisfies (1/2) The relationship between b≧a. The composite telescopic member according to claim 1, wherein the length of the fixed portion in the direction in which the elastic member extends is 0.01 mm or more and 1 mm or less under the extension limit state of the composite telescopic member. The composite telescopic member according to claim 1, wherein in the extension limit state of the composite telescopic member, the length of the non-fixed portion in the direction in which the elastic member extends is 1.5 mm or more and 5.0 mm or less. As claimed in claim 1, the thickness of the composite telescopic element in the relaxed state and under a load of 0.5 gf/cm ² is 2 mm or more and 4 mm or less. As claimed in claim 1, the thickness of the composite telescopic element in the relaxed state and under a load of 50 gf/cm ² is more than 20% of the thickness in the relaxed state and under a load of 0.5 gf/cm ² . The composite telescopic member according to claim 1, wherein the thickness of the elastic member is set as T(dtex), and the length of the fixed portion in the direction in which the elastic member extends in the extension limit state of the composite stretchable member is set as When it is a (mm), the value of T/a is 10 or more and 40000 or less. The composite telescopic element of claim 1, wherein at least one of the two sheets is a non-woven fabric, and the basis weight of the non-woven fabric is 13 g/m ² or more and 25 g/m ² or less. The composite telescopic member according to claim 1, wherein in the fixing portion, the two sheets and the elastic member are fixed by bonding with an adhesive. The composite telescopic member according to claim 14, wherein the adhesive agent is continuously extended and arranged in a direction intersecting the direction in which the elastic members extend so as to span the elastic members. The composite telescopic member according to claim 1, wherein a plurality of rows are arranged side by side in the direction in which the elastic member extends. The plurality of fixing portion rows are arranged side by side along a direction orthogonal to the direction in which the elastic member extends. The composite telescopic element according to claim 1, wherein at least one of the two sheets comprises a nonwoven fabric and has a plurality of embossed portions. The composite telescopic member according to claim 17, wherein a plurality of lines are arranged side by side in a direction orthogonal to the direction in which the elastic members extend, and a plurality of the above-mentioned embossings are arranged side by side at specific intervals in the direction in which the elastic members extend. Department of embossing department line. The composite telescopic member according to claim 18, wherein in at least a part of the row of the embossed portions of the sheet, the distance between the embossed portions is smaller than the length of the fixed portion at the limit of elongation. The composite telescopic element according to claim 18, wherein the embossed portion is disposed in the non-fixed portion in at least a part of the embossed portion row in the sheet material. The composite telescopic element according to claim 20, wherein a plurality of the embossed portions are arranged in one of the non-fixed portions in at least a part of the embossed portion rows in the sheet material. The composite telescopic member of claim 18, wherein in all of the rows of the embossed portions in the sheet, the distance between the embossed portions is smaller than the length of the fixed portion in the limit state of elongation in the direction in which the elastic member extends . The composite telescopic element according to claim 18, wherein in all the rows of the embossed portion in the sheet, the embossed portion is disposed in the non-fixed portion. The composite telescopic element according to claim 23, wherein a plurality of the above-mentioned embossed parts are arranged in one of the above-mentioned non-fixed parts in all of the above-mentioned embossed part rows in the above-mentioned sheet material. A composite telescopic member, which has two sheets, and a plurality of elastic members extending along one direction disposed between the two sheets, and which can expand and contract along the one direction, extend along the elastic members There are a plurality of fixing parts that fix the elastic member and the two sheets of the above-mentioned sheet material intermittently in the direction of the above-mentioned elastic member, and between the above-mentioned fixing parts adjacent to the direction in which the elastic member extends, there is no elastic member and the two above-mentioned fixing parts. The non-fixed portion to which the above-mentioned sheet is fixed, the two above-mentioned sheets located in the above-mentioned non-fixed portion protrude in a direction away from each other, and the pleats extending in the direction intersecting with the direction in which the elastic member extends are along the direction of the elastic member. A plurality of rows are formed in the extending direction, and at least one of the two sheets has a plurality of embossed portions, and a plurality of rows are arranged side by side in the direction orthogonal to the extending direction of the elastic member in the direction in which the elastic member extends A plurality of embossed portion rows of the above-mentioned embossed portions are arranged side by side at a specific interval, and in at least a part of the above-mentioned embossed portion rows in the above-mentioned sheet, the interval between the above-mentioned embossed portions is smaller than the direction in which the above-mentioned elastic member extends The length of the above-mentioned fixed part at the limit state of elongation. The composite telescopic element according to claim 25, wherein the embossed portion is disposed in the non-fixed portion in at least a part of the embossed portion row in the sheet. The composite telescopic element according to claim 26, wherein a plurality of the embossed portions are arranged in one of the non-fixed portions in at least a part of the embossed portion rows in the sheet material. The composite telescopic member of claim 25, wherein in all of the rows of the embossed portions in the sheet material, the distance between the embossed portions is smaller than the length of the fixed portion in an elongation limit state. The composite telescopic element according to claim 25, wherein in all the rows of the embossed portions in the sheet, the embossed portions are arranged in the non-fixed portions. The composite telescopic member according to claim 28, wherein a plurality of the embossed portions are arranged in one of the non-fixed portions in all of the embossed portion rows in the sheet. A disposable diaper provided with the composite telescopic member of any one of claims 1 to 30. The disposable diaper according to claim 31, which has an absorbent body and an outer body disposed on the non-skin-opposite surface side, wherein the composite stretchable member constitutes a part of the outer body, and the composite stretchable member constitutes a part of the outer body. In the sheet of the outermost surface, printing is performed on the skin-facing side.

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