WO2018189780A1 - 複合伸縮部材及びそれを備えた使い捨ておむつ - Google Patents

複合伸縮部材及びそれを備えた使い捨ておむつ Download PDF

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Publication number
WO2018189780A1
WO2018189780A1 PCT/JP2017/014654 JP2017014654W WO2018189780A1 WO 2018189780 A1 WO2018189780 A1 WO 2018189780A1 JP 2017014654 W JP2017014654 W JP 2017014654W WO 2018189780 A1 WO2018189780 A1 WO 2018189780A1
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WIPO (PCT)
Prior art keywords
elastic member
composite
embossed
fixed portion
fixed
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Application number
PCT/JP2017/014654
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English (en)
French (fr)
Japanese (ja)
Inventor
賢治 安藤
政宏 南岡
弘行 横松
猛史 宮村
Original Assignee
花王株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 花王株式会社 filed Critical 花王株式会社
Priority to CN201780089479.2A priority Critical patent/CN110545767B/zh
Priority to JP2019512061A priority patent/JP6970741B2/ja
Priority to PCT/JP2017/014654 priority patent/WO2018189780A1/ja
Priority to TW107107800A priority patent/TWI755495B/zh
Publication of WO2018189780A1 publication Critical patent/WO2018189780A1/ja

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers

Definitions

  • the present invention relates to a composite elastic member and a disposable diaper provided with the same.
  • Patent Document 1 describes a stretchable composite sheet 1 in which two sheet materials 2 and 3 are joined at a plurality of joining regions 5.
  • the plurality of joining regions 5 are arranged intermittently in the expansion / contraction direction X of the elastic member 4 and intermittently or continuously in the orthogonal direction Y thereof.
  • a plurality of bonding lines 50 and 51 including a plurality of bonding regions 5 are formed along both directions X and Y, respectively.
  • the plurality of joining regions 5 have joining portions 7 and non-joining portions 8 to which the sheet materials 2 and 3 are joined, and these are alternately arranged in at least one of the expansion / contraction direction X and the orthogonal direction Y thereof. It is arranged in.
  • Patent Document 2 describes an elastic sheet-like composite composed of a strand and an elastic sheet bonded with the strand.
  • the elastic sheet-like composite has an arch portion that protrudes from the strand between the sheet bonding positions.
  • Patent Document 3 describes an elastic structure of an absorbent article that includes a plurality of elastic elastic members and a first layer and a second layer that sandwich the elastic elastic members.
  • the first layer and the second layer are joined by an adhesive applied in a striped pattern that is intermittent in the expansion and contraction direction to form a sheet joining portion.
  • the elastic elastic member is fixed to the first layer and the second layer with an adhesive at a position intersecting with the sheet joint portion. Then, the first layer and the second layer contract as the elastic expansion and contraction member contracts, so that the portions located between the sheet joint portions in the first layer and the second layer swell in opposite directions to form wrinkles, respectively. Yes.
  • the present invention provides a composite elastic member having two sheet materials and a plurality of elastic members extending in one direction disposed between the two sheet materials and capable of expanding and contracting along the one direction.
  • the composite elastic member has intermittently a plurality of fixing portions for fixing the elastic member and the two sheet members along the extending direction of the elastic member.
  • the composite stretchable member has a non-fixed portion where the elastic member is not fixed to the two sheet members between the fixed portions adjacent to each other along the extending direction of the elastic member. Two rows of the sheet material positioned in the non-fixed portion protrude in a direction away from each other and extend in a direction intersecting with the extending direction of the elastic member, and a plurality of rows are formed along the extending direction of the elastic member. Yes.
  • the difference between the stretch rate of the composite stretchable member and the stretch rate of the fixed portion, and the stretch rate of the composite stretchable member and the stretch of the non-fixed portion is within ⁇ 15%.
  • the present invention includes a composite elastic member having two sheet materials and a plurality of elastic members extending in one direction disposed between the two sheet materials and capable of expanding and contracting along the one direction.
  • the composite elastic member has intermittently a plurality of fixing portions for fixing the elastic member and the two sheet members along the extending direction of the elastic member.
  • the composite stretchable member has a non-fixed portion where the elastic member is not fixed to the two sheet members between the fixed portions adjacent to each other along the extending direction of the elastic member. Two rows of the sheet material positioned in the non-fixed portion protrude in a direction away from each other and extend in a direction intersecting with the extending direction of the elastic member, and a plurality of rows are formed along the extending direction of the elastic member.
  • At least one of the two sheet materials has a plurality of embossed portions, and an embossed portion row in which the plurality of embossed portions are arranged at a predetermined pitch in a direction in which the elastic member extends is provided on the elastic member.
  • a plurality of rows are arranged in a direction orthogonal to the extending direction.
  • the pitch of the embossed portions is smaller than the length of the fixed portion in the stretch limit state.
  • FIG. 1 is a cross-sectional view showing an embodiment of the composite elastic member of the present invention.
  • FIG. 2 is a cross-sectional view when the composite elastic member shown in FIG. 1 is in an extended state.
  • FIG. 3 is a cross-sectional view of the composite elastic member viewed from a direction orthogonal to FIG. 4A to 4C are cross-sectional views in the thickness direction showing changes when the composite elastic member of the present invention is extended from its relaxed state.
  • 5A to 5D are cross-sectional views in the thickness direction showing changes when a conventional composite stretchable member is extended from its relaxed state.
  • FIGS. 6A to 6C are plan views showing a state in which the sheet material of the composite stretchable member is embossed.
  • FIG. 7 is a cross-sectional view (corresponding to FIG. 2) when the composite elastic member of another embodiment of the present invention is in an extended state.
  • the present invention relates to an improvement of a stretchable elastic member having a heel, and more particularly to a composite stretchable member that can maintain softness and cushion feeling due to heel even when an external force is applied to the heel.
  • FIG. 1 is a cross-sectional view showing an embodiment of the composite elastic member of the present invention.
  • This cross-sectional view is a cross-sectional view in the thickness direction cut along the extending direction of the elastic member when the composite elastic member is in a relaxed state.
  • FIG. 2 is a cross-sectional view when the composite elastic member shown in FIG. 1 is in an extended state.
  • FIG. 3 is a cross-sectional view seen from a direction orthogonal to FIG.
  • the composite elastic member 10 of the present embodiment includes two sheet materials 11 and 12 and a plurality of elastic members 13 disposed between the two sheet materials.
  • the sheet materials 11 and 12 and the elastic member 13 constitute an expansion / contraction part in the composite expansion / contraction member 10.
  • the stretchable part can be stretched along the direction in which the elastic member extends.
  • the elastic member 13 is an elongated one and is generally called a rubber thread or a strand.
  • the thickness, material, elastic modulus and the like of each elastic member 13 may be the same or different. In general, the same elastic member 13 is used, but is not limited thereto.
  • Each elastic member 13 is disposed and fixed between the sheet materials 11 and 12 so as to extend in one direction in an extended state. Therefore, the composite stretchable member 10 can be stretched in the one direction.
  • the plurality of elastic members 13 are arranged substantially in parallel with an interval in the direction intersecting the extending direction. Therefore, the distance D (see FIG. 3) between the adjacent elastic members 13 is substantially the same at any position of the elastic member 13.
  • the distance D between any two adjacent elastic members 13 may be the same or different.
  • the intervals D between any two adjacent elastic members 13 are substantially the same.
  • the distance D is preferably 0.5 mm or more, more preferably 0.75 mm or more, and further preferably 1 mm or more. Further, it is preferably 3 mm or less, more preferably 2.5 mm or less, and further preferably 2 mm or less. Specifically, the distance D is preferably 0.5 mm or greater and 3 mm or less, more preferably 0.75 mm or greater and 2.5 mm or less, and even more preferably 1 mm or greater and 2 mm or less. By setting the distance D within this range, the appearance of the heel 15 described later can be further improved.
  • Each elastic member 13 is fixed to each of the two sheet materials 11 and 12 sandwiching the elastic member 13, thereby forming a fixing portion 14 in the composite elastic member 10.
  • Each elastic member 13 and the two sheet materials 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 fixing portions 14 are intermittently formed along the direction in which the elastic member 13 extends.
  • the two sheet materials 11, 12 and the elastic member 13 are fixed by various fixing means.
  • the fixing means means used for this type of elastic member is appropriately employed. Examples of such means include adhesion by an adhesive, thermal fusion, or bonding by ultrasonic vibration. Of these fixing means, as will be described later, it is preferable to use adhesion by an adhesive from the viewpoint of imparting stretchability to the fixing portion 14.
  • the composite elastic member 10 protrudes in a direction in which the two sheet materials 11 and 12 located between the adjacent fixed portions 14 along the extending direction of the elastic member 13 are separated from each other.
  • the ridges 15 extending in the direction intersecting with the extending direction of the elastic member 13 are formed in a plurality of rows along the extending direction of the elastic member 13.
  • the composite stretchable member 10 is in its relaxed state, and the two sheet materials 11 and 12 positioned between the adjacent fixed portions 14 are deformed into an arch shape.
  • a plurality of ridges 15 are formed on the composite elastic member 10.
  • the flange 15 extends in a direction intersecting with the direction in which the elastic member 13 extends.
  • the flanges 15 are formed in a plurality of rows along the direction in which the elastic member 13 extends.
  • the fixing portion 14 is arranged along the direction intersecting with the extending direction of the elastic member 13 to form a fixing portion row (not shown) composed of a plurality of fixing portions 14. It is preferable to make it. It is preferable that this fixed part row extends linearly in a direction intersecting with the direction in which the elastic member 13 extends.
  • a plurality of fixed portion rows are arranged along the direction in which the elastic member 13 extends. In particular, the fixed portion row extends linearly in a direction orthogonal to the extending direction of the elastic member 13 to form a plurality of fixed portion rows, and the plurality of fixed portion rows and the plurality of flanges 15 extend from the elastic member 13.
  • the two sheet materials 11 and 12 are joined to each other also in the region between the elastic members 13, that is, in the region between the adjacent fixed portions 14. More specifically, in the composite elastic member 10, the two sheet materials 11 and 12 and the elastic member 13 are fixed by bonding with an adhesive, and the adhesive is connected to each elastic member 13 in the fixed portion row. Is extended continuously in the direction intersecting with the direction in which the elastic member 13 extends.
  • Each fixed row is arranged in parallel. Therefore, the interval between adjacent fixed part rows is substantially the same at any position of the fixed part rows.
  • the interval between any two adjacent fixed part rows may be the same or different. In general, the intervals between any two adjacent fixed part rows are substantially the same.
  • the interval between the fixed part rows here is synonymous with the length of the non-fixed part 16 described later.
  • the elastic member 13 is not fixed to the two sheet materials 11 and 12 between the plurality of adjacent fixing portions 14 along the extending direction of the elastic member 13. It has become.
  • the non-fixed portion 16 coincides with the formation position of the flange 15. That is, the two sheet members 11, 12 positioned in the non-fixed portion 16 protrude in the direction away from each other, and the flange 15 extending in the direction intersecting with the extending direction of the elastic member 13 extends along the extending direction of the elastic member 13. Multiple rows are formed.
  • the non-fixed portion 16 has a predetermined length along the direction in which the elastic member 13 extends. The length of the non-fixed portion 16 changes according to the degree of extension of the composite elastic member 10. Specifically, the greater the degree of elongation of the composite stretchable member 10, the longer the length of the non-fixed portion 16.
  • the fixed portion 14 also has a predetermined length along the direction in which the elastic member 13 extends.
  • the length of the fixed portion 14 changes according to the degree of extension of the composite stretchable member 10. Specifically, the greater the degree of elongation of the composite stretchable member 10, the longer the length of the fixed portion 14. In contrast to this, the stretchable members known so far have no substantial change in the length of the fixing portion unless the stretchable members are extended greatly.
  • the fixing portion 14 in the composite elastic member 10 of the present embodiment expands and contracts due to the expansion and contraction of the composite elastic member 10, various advantages described later occur.
  • FIG. 4A is a cross-sectional view in the thickness direction of the composite stretchable member 10 in a relaxed state (corresponding to FIG. 1).
  • Fig.4 (a) the external force which expands this to the composite expansion-contraction member 10 is not added.
  • the length of the fixed portion 14 is a1
  • the length of the non-fixed portion 16 is b1.
  • FIG. 4B shows a state in which the composite elastic member 10 is slightly extended along the direction in which the elastic member 13 extends from the state shown in FIG. In the state shown in FIG. 4B, an external force that extends the composite stretchable member 10 is slightly applied. If the length of the fixed portion 14 in this state is a2, and the length of the non-fixed portion 16 is b2, then a2> a1 and b2> b1. That is, the composite stretchable member 10 is slightly stretched so that both the fixed portion 14 and the non-fixed portion 16 are stretched.
  • the state of the composite elastic member 10 shown in FIG. 4 (c) is a state where the extension limit has been reached.
  • 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 and b3> b2> b1.
  • FIGS. 5A to 5D sequentially show a process of extending the known elastic member 100 along the direction in which the elastic member 113 extends.
  • FIG. 5A is a sectional view in the thickness direction of the composite elastic member 100 in a relaxed state.
  • the external force which expands this to the composite expansion-contraction member 100 is not applied.
  • the length of the fixed portion 114 is a1 '
  • the length of the non-fixed portion 116 is b1'.
  • FIG. 5B shows a state in which the composite stretchable member 100 is slightly extended along the direction in which the elastic member 113 extends from the state shown in FIG.
  • the state shown in FIG. 5C is a state when the composite elastic member 100 is extended to a state close to the extension limit.
  • the fixing portion 114 starts to extend only after extending to this state.
  • the state of the composite elastic member 100 shown in FIG. 5 (d) is a state where the extension limit has been reached.
  • a4 ′> a3 ′> a2 a1 and b4 ′> b3 ′> b2 ′> b1 It has become.
  • the composite stretchable member 10 of the present embodiment is that both the fixed portion 14 and the non-fixed portion 16 are stretched from the initial state of elongation, that is, with a small tensile force.
  • the elongation characteristics are greatly different from those of the conventional composite stretchable member.
  • the composite stretchable member 10 of the present embodiment having this inherent stretchability, the composite stretchable member 10 has even better softness of the heel 15 and a cushion feeling.
  • the contraction force that tries to return to the length before extension acts because the fixing portion 14 has stretchability. Therefore, the distance between the adjacent ridges 15 is reduced. As a result, even if an external force is applied to the heel 15 in a state where the composite elastic member 10 is extended and the heel 15 falls, the heel 15 in the lying state can lean against another adjacent heel 15. The softness and cushioning of the product will not be damaged.
  • both the fixed portion 14 and the non-fixed portion 16 are extended with a small tensile force as described above.
  • the extent of the extension is preferably as described below from the viewpoint of maintaining softness and cushion feeling even when an external force is applied to the composite stretchable member 10. That is, it is preferable that the composite stretchable member 10 has a lower elongation rate in the fixed portion 14 than in the non-fixed portion in a state in which this is expanded by 25% from its relaxed state.
  • the composite stretchable member 10 has a difference (E ⁇ E1) between the stretch rate E of the composite stretchable member 10 and the stretch rate E1 of the fixing portion 14 in a state where the stretchable member 10 is stretched by 25% from its relaxed state, and the composite stretchable member. It is preferable that the difference (E ⁇ E2) between the expansion rate E of the member 10 and the expansion rate E2 of the non-fixed portion 16 is within ⁇ 15%. Since the fixing portion 14 and the non-fixing portion 16 have such an extensibility, the non-fixing portion 16 easily contracts together with the fixing portion 14 in the relaxed state of the composite elastic member 10, and as a result, the length of the fixing portion 14. Is shorter in the relaxed state than in the extended state.
  • the heel 15 in the lying state can lean against another adjacent heel 15, so that the softness and cushion feeling of the heel 15 are not easily impaired.
  • the stretch rate of the composite stretchable member 10 at that time The degree of extension is such that the difference (E ⁇ E1) between E and the extension rate E1 of the fixed portion 14 and the difference (E ⁇ E2) between the extension rate E2 of the non-fixed portion 16 are within ⁇ 15%, respectively. It is more preferable.
  • the stretch rate E of the composite stretchable member 10 and the stretch rate E1 of the fixing portion 14 are within ⁇ 14%, and more preferably within ⁇ 13%. More preferably, it has a sufficient degree of elongation.
  • the composite stretchable member 10 when the composite stretchable member 10 is stretched by 25% or more from its relaxed state, that is, in all stretch regions from the stretched state of the composite stretchable member 10 to the stretch limit state, the composite stretchable at that time
  • the difference (E ⁇ E1) between the elongation rate E of the member 10 and the elongation rate E1 of the fixed portion 14 and the difference (E ⁇ E1) between the elongation rate E2 of the non-fixed portion 16 are within ⁇ 14%, respectively. It is even more preferred to have a degree of elongation, and even more preferred to have a degree of elongation that is within ⁇ 13%.
  • Elongation rate (%) (Length after stretching ⁇ Length before stretching) / Length before stretching ⁇ 100 Therefore, for example, stretching 1.5 times is synonymous with stretching so that the stretch rate is 50%.
  • the value of (25 ⁇ E1 25 ) is preferably 15% or less, and 14% or less. More preferably, it is more preferably 13% or less.
  • the value of (25 ⁇ E1 25 ) is preferably closer to zero. Since the extension rate of the fixing portion 14 is as described above, the fixing portion 14 can easily extend even with a small tensile force.
  • the value of (25 ⁇ E2 25 ) is preferably ⁇ 15% or more, It is more preferably 14% or more, and further preferably -13% or more.
  • the value of (25 ⁇ E2 25 ) is preferably closer to zero.
  • the composite elastic member 10 has a cross-sectional shape in the thickness direction that bulges in the direction in which the two sheet materials 11 and 12 are separated from each other, as shown in FIG. Therefore, the space S is defined by the two sheet materials 11 and 12.
  • the cross-sectional area of the space S gradually changes accordingly.
  • the cross-sectional area increases as the elongation rate increases. It was found that the cross-sectional area began to increase as the elongation increased further.
  • the composite elastic member 10 in which a peak is observed in the cross-sectional area when the elongation rate is within 50% exhibits a particularly soft touch and good air permeability. There was found.
  • the stretch rate E1 of the fixed portion 14 is lower than the stretch rate E2 of the non-fixed portion 16. That is, E1 ⁇ E2.
  • This relationship is preferably established in a state in which the composite elastic member 10 is extended by 25% from its relaxed state, and more preferably in any elongation ratio of the composite elastic member 10.
  • E1 is defined by (a S ⁇ a N ) / a N ⁇ 100.
  • E2 is defined by (b S ⁇ b N ) / b N ⁇ 100.
  • a S and b S represent the lengths of the fixed portion 14 and the non-fixed portion 16 in the extended state extended by a predetermined tensile force
  • a N and b N indicate the fixed portion 14 and the non-fixed state in the relaxed state.
  • the length of the part 16 is represented.
  • the composite stretchable member 10 When the length of the fixed portion 14 in the extending direction of the elastic member 13 is a and the length of the non-fixed portion 16 is b in the stretch limit state, the composite stretchable member 10 is (1/2) b ⁇ a It satisfies the relationship.
  • the stretch limit state of the composite stretchable member 10 is a state where the composite stretchable member 10 is stretched along the direction in which the elastic member 13 extends and reaches the stretch limit.
  • the extension limit is a length in a state where the elastic member 13 is removed from the composite elastic member 10 and only the sheet materials 11 and 12 are isolated, and the isolated sheet materials 11 and 12 do not extend any further. is there.
  • the length relationship between the fixed portion 14 and the non-fixed portion 16 as described above is extremely advantageous in that softness and cushion feeling are maintained even when an external force is applied to the composite stretchable member 10.
  • the length of the fixed portion 14 and the length b of the non-fixed portion 16 satisfy the relationship (1/2) b ⁇ a, so that the composite stretchable member 10 is stretched to near the stretch limit. Even if an external force is applied to the heel 15 and the heel 15 falls, the heel 15 in a lying state can lean against another adjacent heel 15, so that the softness and cushion feeling of the heel 15 are not easily impaired.
  • 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. 1/3) More preferably, b ⁇ a.
  • the lengths of the fixing portions 14 formed on the composite stretchable member 10 of the present embodiment may all be the same or different.
  • the lengths of the non-fixed portions 16 formed on the composite stretchable member 10 may all be the same or different.
  • the length a of the fixing portion 14 refers to the length of each fixing portion 14.
  • 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 2.0 mm or more and 3. More preferably, it is 0 mm or less.
  • the collar 15 becomes fine and the appearance of the collar 15 is improved.
  • the length b of the non-fixed portion 16 described above is one non-fixed portion between the fixed portions 14 and 14. The length of each fixed part 16 is indicated.
  • the thickness of the composite elastic member 10 is preferably 2 mm or more under a load of 0.5 gf / cm 2 in a relaxed state. 1 mm or more is more preferable, and 2.2 mm or more is even more preferable. In addition, it is preferably 4 mm or less, more preferably 3.5 mm or less, and even more preferably 3 mm or less under a load of 0.5 gf / cm 2 . Specifically, the thickness of the composite elastic member 10 is preferably 2 mm or more and 4 mm or less, and 2.1 mm or more and 3.5 mm or less under a load of 0.5 gf / cm 2 in a relaxed state. Is more preferably 2.2 mm or more and 3 mm or less.
  • the composite stretchable member 10 can maintain the softness and cushion feeling due to the heel 15 even when an external force is applied to the heel 15.
  • the composite elastic member 10 preferably has a thickness under a load of 50 gf / cm 2 in a relaxed state of 20% or more of a thickness under a load of 0.5 gf / cm 2 in a relaxed state. It is more preferably 30% or more, and further preferably 50% or more.
  • the upper limit of this value is not particularly limited and is preferably as large as possible. However, when the value is as large as about 70%, even when an external force is applied to the heel 15, the softness and cushion feeling due to the heel 15 are sufficiently maintained.
  • the thickness of the composite elastic member 10 is measured using KES-FB3-AUTO-A manufactured by Kato Tech Co., Ltd. under the above load.
  • the elastic member 13 in the composite stretchable member 10 is used for the purpose of imparting stretchability to the composite stretchable member 10.
  • the elastic member 13 is used for the purpose of forming a plurality of ridges 15 on the composite stretchable member 10. 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 the viewpoint of successfully forming the ridge 15 having a good appearance. 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 150 or more. More preferably, it is more preferably 300 or more.
  • the T / a value is preferably 40000 or less, more preferably 20000 or less, and still more preferably 8000 or less.
  • the value of T / a is preferably 10 or more and 40000 or less, more preferably 150 or more and 20000 or less, and further preferably 300 or more and 8000 or less.
  • the value of a is a value measured in the stretch limit state of the composite stretchable member 10 as described above.
  • the value of T is a value measured with the elastic member 13 removed from the composite elastic member 10 and the removed elastic member 13 in a relaxed state.
  • the two sheet materials 11 and 12 constituting the composite stretchable member 10 various nonwoven fabrics and films can be used.
  • the two sheet materials 11 and 12 may be the same or different.
  • the nonwoven fabric for example, a spunbond nonwoven fabric, an air-through nonwoven fabric, a spunlace nonwoven fabric, a melt blown nonwoven fabric, or the like can be used. Two or more kinds of laminates of these nonwoven fabrics can also be used.
  • the basis weight of the nonwoven fabrics is preferably independently 13 g / m 2 or more, more preferably 15 g / m 2 or more, and more preferably 17 g / m 2 or more. More preferably it is. Also it is preferably 25 g / m 2 or less, further preferably 23 g / m 2 or less, and still more preferably 21g / m 2 or less.
  • various thermoplastic resins can be used. Fibers composed of a combination of two or more thermoplastic resins can also be used. The thickness of the fibers constituting the nonwoven fabric is preferably about 1 dtex or more and 10 dtex or less.
  • a plurality of embossed portions 20 may be formed by so-called embossing.
  • the embossed portion 20 is preferably a concave shape having a bottom surface with a predetermined area.
  • the shape of the bottom surface is not particularly limited, and may be, for example, a circular shape, or may be a non-circular shape such as a square, a rectangle, a rhombus, or a polygon.
  • the embossed portion 20 is formed, for example, by supplying a sheet material between a pair of rolls rotating in opposite directions and pressing the sheet material by a plurality of protrusions provided on the outer peripheral surface of at least one of the rolls. Is done.
  • the other roll may be a flat roll having a smooth peripheral surface. It is preferable that at least one of the pair of rolls is heated for the purpose of enhancing the weldability of the constituent fibers during pressing.
  • the embossed portions 20 are arranged so as to form an embossed portion row 21 in which a plurality of the embossed portions 20 are arranged in a row with a predetermined pitch P in the extending direction X of the elastic member.
  • column 21 is formed in multiple rows along the direction orthogonal to the direction X where an elastic member extends.
  • the embossed portion row 21 is preferably formed so as to extend in parallel with the extending direction X of the elastic member, but is not necessarily parallel, and the extending direction X of the elastic member and the extending direction of the embossed portion row 21 Are allowed to cross each other so as to form an angle within 15 °.
  • the plurality of embossed portions 20 may be arranged in a staggered pattern as shown in FIG. 6A, for example, or may be arranged in a grid pattern as shown in FIG. 6B.
  • the position of the embossed portion 20 is shifted by a half of the pitch P in the extending direction X of the elastic member 13 between the embossed portion rows 21 adjacent to each other in the direction orthogonal to the extending direction X of the elastic member.
  • the embossed portion 20 has a plurality of values P1, P2,... In the embossed portion row 21 formed on one sheet material. May be arranged.
  • the pitch P of the embossed portion 20 in the embossed portion row 21 is such that the composite elastic member is smaller than the length a of the fixed portion 14 in the stretch limit state, that is, a> P. Preferably it is.
  • the embossed portion row 21 having the pitch P1 of the embossed portion 20 and the embossed portion row 21 having the pitch P2 of the embossed portion 20 having a value different from the pitch P1 are provided.
  • the pitch of the embossed portions 20 in at least some of the embossed portion rows 21 only needs to have a relationship of a> P, that is, a> P1 or a> P2.
  • the pitch of the embossed portions 20 at 21 has a relationship of a> P, that is, a> P1 and a> P2. Since the pitch P between the fixed portion 14 and the embossed portion 20 is in the above-described relationship, the fixed portion 14 and the embossed portion 20 overlap in the extending direction X of the elastic member (not shown). Or the adhesive strength of the sheet
  • FIG. 7 is a cross-sectional view of the composite stretchable member in the stretch limit state, as in FIG.
  • the embossed portion 20 is arranged on the non-fixed portion 16 in at least some embossed portion rows 21 in the sheet materials 11 and 12. Since the embossed portion 20 is disposed on the non-fixed portion 16, the rigidity of the non-fixed portion 16 is locally increased as compared to the case where the embossed portion 20 is not disposed. As a result, the embossed portion 20 becomes a bending point, and the sheet materials 11 and 12 are easily deformed into an arch shape (see FIG. 1), so that a clean wrinkle can be easily formed. Furthermore, it is more preferable that the plurality of embossed portions 20 are arranged on one non-fixed portion 16 in the direction X in which the elastic member extends.
  • the plurality of embossed portions 20 are arranged on one non-fixed portion 16, so that the sheet materials 11 and 12 are more easily deformed into an arch shape.
  • the embossed part rows 21 in either one of the sheet material 11 and the sheet material 12 it is preferable that the embossed part 20 is arranged in the non-fixed part 16, and in any of the sheet material 11 and the sheet material 12, In all the embossed part rows 21, it is more preferable that the embossed part 20 is arranged on the non-fixed part 16.
  • a plurality of embossed parts 20 are arranged in one non-fixed part 16. In any of 12, it is more preferable that a plurality of embossed portions 20 are arranged on one non-fixed portion 16 in all the embossed portion rows 21.
  • the elastic member 13 is preferably made of a stretchable material such as natural rubber, polyurethane-based resin, urethane-based resin, or hot-melt-type stretchable member in a thread shape (thread rubber) or a strip shape (flat rubber).
  • a thread-like material made of an elastomer material can also be used. Examples of the elastomer material include, but are not limited to, styrene-butadiene-styrene elastomer.
  • the composite elastic member 10 can be preferably manufactured by the following method. That is, while the sheet material 11 is being conveyed, the hot melt adhesive is intermittently applied in the conveying direction in a predetermined application pattern on the region where the elastic member 13 is to be arranged on one surface of the sheet material 11. At this time, the hot melt adhesive is applied not only in the region where the elastic member 13 is to be arranged, but also in a pattern that continuously extends in the direction orthogonal to the conveying direction so as to be applied between the plurality of elastic members 13. It doesn't matter.
  • the elastic member 13 is arranged in the planned arrangement area where the hot melt adhesive is applied, the sheet member 12 is further covered with the elastic member 13, and the three members are pressed together by a nip roll, and the three members are bonded together.
  • the adhesive applied to the sheet material 11 side moves a small amount to the sheet material 12 side by bonding, and as a result, the elastic member 13
  • the adhesive is present over the entire circumference of the shape in the cross-sectional view. As a result, the sheet materials 11 and 12 are joined via the elastic member 13.
  • the bonding force between the sheet material 11 and the elastic member 13 and the bonding force between the sheet material 12 and the elastic member 13 are different depending on the amount of the adhesive, and the bonding force between the sheet material 11 and the elastic member 13 is greater.
  • the bonding force between the sheet material 12 and the elastic member 13 is higher.
  • the composite stretchable member 10 thus obtained is used for various articles that require stretchability.
  • the composite stretchable member 10 can be applied to a site where stretchability is required in a pants-type or tape-deployed disposable diaper.
  • a disposable diaper has an absorptive main body and the exterior body arrange
  • the composite elastic member 10 can be arrange
  • printing can be performed on the skin facing surface side of the exterior body that is a sheet forming the outermost surface of the diaper. By this printing, the appearance of the diaper can be further improved. For example, the diaper can have an underwear-like appearance.
  • the composite stretchable member 10 By applying the composite stretchable member 10 to the portion where printing has been performed, printing becomes clearer. Further, by printing on the skin facing surface side, even if the diaper rubs against the clothing, the printing ink is prevented from being transferred to the clothing.
  • the composite elastic member of the present invention is basically composed of two sheet members and a plurality of elastic members sandwiched therebetween, but in addition to this, for example, at least one of the sheet members 11 and 12 One or more other sheet materials may be laminated on the outer surface of the sheet.
  • composite elastic 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.
  • the present invention further discloses the following composite elastic member and disposable diaper.
  • a composite elastic member having two sheet materials and a plurality of elastic members extending in one direction disposed between the two sheet materials, and capable of expanding and contracting along the one direction, A plurality of fixing portions for fixing the elastic member and the two sheet members intermittently along the extending direction of the elastic member; Between the fixed parts adjacent along the extending direction of the elastic member, the elastic member has a non-fixed part that is not fixed to the two sheet members, Two rows of the sheet material positioned in the non-fixed portion protrude in a direction away from each other and extend in a direction intersecting with the extending direction of the elastic member, and a plurality of rows are formed along the extending direction of the elastic member.
  • the difference between the stretch rate of the composite stretchable member and the stretch rate of the fixed portion, and the stretch rate of the composite stretchable member and the stretch of the non-fixed portion A composite elastic member having a difference from the rate within ⁇ 15%.
  • the plurality of elastic members are arranged at intervals in the direction intersecting the extending direction of the elastic members, and the interval between the adjacent elastic members is preferably 0.5 mm or more. 75 mm or more is more preferable, 1 mm or more is more preferable, 3 mm or less is preferable, 2.5 mm or less is further preferable, and 2 mm or less is more preferable. 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, according to ⁇ 1>.
  • ⁇ 3> The composite elastic member according to ⁇ 1> or ⁇ 2>, wherein the two sheet members and the elastic member are fixed by bonding with an adhesive, thermal fusion, or bonding by ultrasonic vibration.
  • ⁇ 4> The composite elastic member according to any one of ⁇ 1> to ⁇ 3>, wherein in the fixing portion, the two sheet members and the elastic member are fixed by bonding with an adhesive.
  • ⁇ 5> The composite elastic member according to ⁇ 4>, wherein the adhesive extends continuously in a direction intersecting with the extending direction of the elastic member so that the adhesive straddles each elastic member.
  • ⁇ 6> Any one of ⁇ 1> to ⁇ 5>, wherein in the state where the composite elastic member is extended by 25% from its relaxed state, the extension rate in the fixed portion is lower than the extension rate in the non-fixed portion.
  • ⁇ 7> In a state where the composite stretchable member is stretched 25% from its relaxed state, the difference between the stretch rate of the composite stretchable member and the stretch rate of the fixed portion, and the stretch rate of the composite stretchable member and the stretch of the non-fixed portion
  • ⁇ 8> In a state where the composite stretchable member is stretched 25% from its relaxed state, the difference between the stretch rate of the composite stretchable member and the stretch rate of the fixed portion, and the stretch rate of the composite stretchable member and the stretch of the non-fixed portion
  • ⁇ 9> The difference between the elongation rate of the composite stretchable member and the stretch rate of the fixed portion in all the stretched regions from the stretched state of the composite stretchable member by 25% from the relaxed state to the stretch limit state, and the composite stretchable
  • the difference between the elongation rate of the member and the elongation rate of the non-fixed portion has a degree of elongation such that it is within ⁇ 15%, preferably has a degree of elongation such that it is within ⁇ 14%. More preferably, the composite stretchable member according to any one of ⁇ 1> to ⁇ 8>, wherein the composite stretchable member has a degree of elongation such that each is within ⁇ 13%.
  • the length of the fixing portion in the extending direction of the elastic member 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, More preferably, the composite elastic member according to any one of ⁇ 1> to ⁇ 10>, which is 0.2 mm or more and 0.8 mm or less.
  • the length of the non-fixed portion in the extending direction of the elastic member 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.
  • the composite stretchable member according to any one of ⁇ 1> to ⁇ 11>, which is more preferably 2.0 mm or more and 3.0 mm or less.
  • the thickness under a load of 0.5 gf / cm 2 in the relaxed state 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 further preferably 2.2 mm or more and 3 mm or less.
  • the composite elastic member according to any one of ⁇ 1> to ⁇ 12>, wherein ⁇ 14> The thickness under a load of 50 gf / cm 2 in the relaxed state is preferably 20% or more, more preferably 30% or more, even more preferably the thickness under the load of 0.5 gf / cm 2 in the relaxed state.
  • the value of T / a is It is preferably 10 or more, more preferably 150 or more, further preferably 300 or more, more preferably 40000 or less, further preferably 20000 or less, and 8000 or less. More preferably, the value of T / a is preferably 10 or more and 40000 or less, more preferably 150 or more and 20000 or less, and further preferably 300 or more and 8000 or less, ⁇ 1> to ⁇ 14
  • the composite elastic member according to any one of the above.
  • At least one of the two sheet materials is a nonwoven fabric, and the basis weight of the nonwoven fabric is preferably 13 g / m 2 or more, more preferably 15 g / m 2 or more, and 17 g / m 2 or more. ⁇ 1> to ⁇ 15, more preferably 25 g / m 2 or less, further preferably 23 g / m 2 or less, and even more preferably 21 g / m 2 or less.
  • ⁇ 18> The composite elastic member according to any one of ⁇ 1> to ⁇ 17>, wherein at least one of the two sheet materials is made of a nonwoven fabric and has a plurality of embossed portions.
  • the embossed portion row in which a plurality of the embossed portions are arranged at a predetermined pitch in a direction in which the elastic member extends has a plurality of rows aligned in a direction orthogonal to the direction in which the elastic member extends, ⁇ 18 > The composite elastic member described in>.
  • ⁇ 20> The composite elastic member according to ⁇ 19>, wherein in at least a part of the embossed portion row in the sheet material, a pitch of the embossed portion is smaller than a length of the fixed portion in an extension limit state.
  • ⁇ 21> The composite elastic member according to any one of ⁇ 18> to ⁇ 20>, wherein the embossed portion is arranged in the non-fixed portion in at least a part of the embossed portion row in the sheet material.
  • ⁇ 22> The composite elastic member according to ⁇ 21>, wherein a plurality of the embossed portions are arranged in one non-fixed portion in at least a part of the embossed portion row in the sheet material.
  • a composite elastic member having two sheet materials and a plurality of elastic members extending in one direction disposed between the two sheet materials, and capable of expanding and contracting along the one direction, A plurality of fixing portions for fixing the elastic member and the two sheet members intermittently along the extending direction of the elastic member; Between the fixed parts adjacent along the extending direction of the elastic member, the elastic member has a non-fixed part that is not fixed to the two sheet members, Two rows of the sheet material positioned in the non-fixed portion protrude in a direction away from each other and extend in a direction intersecting with the extending direction of the elastic member, and a plurality of rows are formed along the extending direction of the elastic member.
  • At least one of the two sheet materials has a plurality of embossed portions, and an embossed portion row in which the plurality of embossed portions are arranged at a predetermined pitch in a direction in which the elastic member extends is provided on the elastic member. It has multiple rows in a direction orthogonal to the extending direction,
  • the composite elastic member in which at least a part of the embossed portion row in the sheet material has a pitch of the embossed portions smaller than a length of the fixed portion in an extension limit state in the extending direction of the elastic member.
  • ⁇ 28> The composite elastic member according to ⁇ 27>, wherein a plurality of the embossed portions are arranged in one non-fixed portion in at least a part of the embossed portion row in the sheet material.
  • the pitch of the embossed portions is smaller than the length of the fixed portion in the extension limit state, any one of ⁇ 26> to ⁇ 28>.
  • Composite elastic member. ⁇ 30> The composite elastic member according to any one of ⁇ 26> to ⁇ 29>, wherein the embossed portion is arranged in the non-fixed portion in all the embossed portion rows in the sheet material.
  • ⁇ 31> The composite elastic member according to ⁇ 29>, wherein a plurality of the embossed portions are arranged in one non-fixed portion in all the embossed portion rows in the sheet material.
  • a disposable diaper provided with the composite elastic member according to any one of ⁇ 1> to ⁇ 31>.
  • ⁇ 33> In a disposable diaper having an absorbent main body and an exterior body disposed on the non-skin facing surface side, wherein the composite stretchable member forms a part of the exterior body and forms the outermost surface of the composite stretchable member The disposable diaper according to ⁇ 31>, wherein printing is performed on the skin facing surface side.
  • Example 1 A spunbonded nonwoven fabric made of polypropylene fibers having a fineness of about 1 dtex was used as the sheet material. The basis weight of this nonwoven fabric was 18 g / m 2 . Two of these nonwoven fabrics were used, and a hot melt adhesive was intermittently applied to one area of one nonwoven fabric in the region where the thread rubber was to be arranged. The hot melt adhesive was applied at a coating amount of 20 g / m 2 . Next, 100 pieces of thread rubber having a thickness of 155 dtex were stretched to 150% in a region where the hot melt adhesive was applied. The distance between adjacent rubber bands was set to 2 mm.
  • the rubber thread was made of styrene-butadiene-styrene elastomer. This was covered with the other non-woven fabric, and the three members were stuck together with a nip roll. The details of the composite stretchable member thus obtained are shown in Table 1 below.
  • Example 1 In Example 1, a hot melt adhesive was applied to each of the two non-woven fabrics at a coating amount of 10 g / m 2 on the opposite surfaces (20 g / m 2 in total). Except this, it carried out similarly to Example 1, and obtained the composite elastic member.
  • the composite elastic member which has favorable softness and a cushion feeling is provided.
PCT/JP2017/014654 2017-04-10 2017-04-10 複合伸縮部材及びそれを備えた使い捨ておむつ WO2018189780A1 (ja)

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PCT/JP2017/014654 WO2018189780A1 (ja) 2017-04-10 2017-04-10 複合伸縮部材及びそれを備えた使い捨ておむつ
TW107107800A TWI755495B (zh) 2017-04-10 2018-03-08 複合伸縮構件及具備其之拋棄式尿布

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