JP5783951B2 - 複合シートおよび複合シートの製造方法 - Google Patents
複合シートおよび複合シートの製造方法 Download PDFInfo
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- JP5783951B2 JP5783951B2 JP2012103908A JP2012103908A JP5783951B2 JP 5783951 B2 JP5783951 B2 JP 5783951B2 JP 2012103908 A JP2012103908 A JP 2012103908A JP 2012103908 A JP2012103908 A JP 2012103908A JP 5783951 B2 JP5783951 B2 JP 5783951B2
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- elastic
- sheet
- elastic sheet
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Description
特許文献2に開示の複合シートの製造方法によれば、弾性基層として、共押出弾性フィルムを用いることが記載されるが、弾性を有する繊維不織布については言及されていない。
第1の発明は、縦方向およびそれに直交する横方向を有し、一方の面を形成するとともに少なくとも前記横方向へ弾性的に伸縮可能な弾性シートと、他方の面を形成する非弾性シートとが互いに接合された複合シートの改良にかかわる。
複合シート1の厚さは、約1.0〜5.0mm、好ましくは約2.0〜3.5mmである。厚さは、株式会社 大栄科学精器製作所製 THICKNESS GAUGE UF−60を用いて測定した。測定において、円形の加圧板を用い、加圧板面積を20cm2とし、測定荷重を0.3kPaとした。複合シート1は、弾性シート11に第1凸条部15が形成され、非弾性シート12に第2凸条部17が形成されるから、その厚さが増大し、嵩高の複合シート1とすることができる。特に、弾性シート11に形成された第1凸条部15は、その内部が繊維によって満たされているから、その外側からの圧力によってつぶれにくく、つぶれたとしても圧力から解放されると嵩が回復する。したがって、嵩高で肌触りの良い複合シート1を得ることができる。
上記のようなおむつにおいて、複合シート1を用いる場合、弾性シート11を非肌対向面に位置するようにしても良い。その場合であっても、おむつ2の肌対向面および非肌対向面のいずれにも皺が形成されるから、良好な通気性を維持することができる。
比較例では、弾性ウェブ31と非弾性ウェブ32とを超音波装置で接合するのではなく、ホットメルト接着材で接合した。ホットメルト接着材としては、ポリスチレン系エラストマー含有ホットメルトを用い、カーテン型塗工機によってノズルピッチ5mm、質量2g/m2で非弾性ウェブ32に塗工した。比較例では、実施例1と同様の装置設定で製造した。比較例の複合シートは、実施例の複合シートに比べて平面方向通気性が低く、第1および第2凸条部が形成されていないことが推察できる。また、表1には記載しないが、弾性ウェブ31と非弾性ウェブ32との接合強度は実施例に比べて小さく、実施例1の40%程度であった。
第1の発明にかかる複合シート1は、縦方向Yおよびそれに直交する横方向Xを有し、一方の面を形成するとともに少なくとも前記横方向へ弾性的に伸縮可能な弾性シート11と、他方の面を形成する非弾性シート12とが互いに接合される。
前記弾性シート11および前記非弾性シート12は、前記縦方向Yおよび前記横方向Xにそれぞれ離間する多数の接合部13によって互いに接合される。
前記弾性シート11は、前記接合部13に重なるとともに前記横方向Xへ延びる第1凹条部14と、前記第1凹条部14に隣接し前記横方向Xへ延びる複数の第1凸条部15とを有する。
前記非弾性シート12は、前記接合部13に重なるとともに前記縦方向Yへ延びる第2凹条部16と、前記第2凹条部16に隣接し前記縦方向Yへ延びる複数の第2凸条部17とを有する。
(1)前記弾性シート11および前記非弾性シート12は、熱可塑性樹脂を含む繊維不織布によってそれぞれ形成され、前記弾性シート11と前記非弾性シート12とは、前記接合部13において溶着される。
(2)前記弾性シート11は、弾性繊維と非弾性繊維とを有する。
(3)前記非弾性シート12は、前記第2凸条部17において、前記弾性シート11から離間されて空隙18が形成される。
(4)前記弾性シート11は、前記第1凸条部15において、少なくともその一部が前記非弾性シート12に接触される。
(5)前記接合部13は、前記横方向Xへ延びる仮想線19に沿って離間して設けられ、前記仮想線19は、前記横方向Xへ離間して複数配置され、隣接する前記仮想線19における前記接合部13は、前記縦方向Yにおいて互いに重ならない位置関係を有する。
前記弾性シート11を構成する弾性ウェブ31を第1巻出しロール33によって搬送する工程と、
前記弾性ウェブ31をニップロール44を介してソニックホーン41およびこれに対向するアンビル42を有する超音波装置40へ搬送する工程と、
前記非弾性シート12構成する非弾性ウェブ32を第2巻出しロール46によって前記超音波装置40へと搬送する工程と、
前記弾性ウェブ31と前記非弾性ウェブ32とを、前記超音波装置40によって接合する工程とを含み、
前記アンビル42の周面には、回転方向および軸方向へそれぞれ離間する多数の凸部43が設けられ、前記弾性ウェブ31は、前記周面に接触して搬送されるとともに、前記アンビル42の回転速度は、前記ニップロール44の回転速度よりも速くされる。
(1)前記弾性ウェブ31は、前記アンビル42と前記ニップロール44との間で、機械方向MDに伸長されるとともに、その伸長前よりも伸長後の方が前記機械方向MDに直交する交差方向における寸法が小さくされる。
(2)前記弾性ウェブ31が、一対のギアロール36,37によって延伸加工される工程をさらに含み、延伸加工された前記弾性ウェブ31に前記接合部13が形成される。
11 弾性シート
12 非弾性シート
13 接合部
14 第1凹条部
15 第1凸条部
16 第2凹条部
17 第2凸条部
18 空隙
31 弾性ウェブ
32 非弾性ウェブ
33 第1巻出しロール
36 ギアロール
37 ギアロール
40 超音波装置
41 ソニックホーン
42 アンビル
43 凸部
44 ニップロール
46 第2巻出しロール
Claims (9)
- 縦方向およびそれに直交する横方向を有し、一方の面を形成するとともに少なくとも前記横方向へ弾性的に伸縮可能な弾性シートと、他方の面を形成する非弾性シートとが互いに接合された複合シートにおいて、
前記弾性シートおよび前記非弾性シートは、前記縦方向および前記横方向へそれぞれ離間する多数の接合部によって互いに接合され、
前記弾性シートは、前記接合部に重なるとともに前記横方向へ延びる第1凹条部と、前記第1凹条部に隣接し前記横方向へ延びる複数の第1凸条部とを有し、
前記非弾性シートは、前記接合部に重なるとともに前記縦方向へ延びる第2凹条部と、前記第2凹条部に隣接し前記縦方向へ延びる複数の第2凸条部とを有することを特徴とする前記複合シート。 - 前記弾性シートおよび前記非弾性シートは、熱可塑性樹脂を含む繊維不織布によってそれぞれ形成され、前記弾性シートと前記非弾性シートとは、前記接合部において溶着される請求項1記載の複合シート。
- 前記弾性シートは、弾性繊維と非弾性繊維とを有する請求項1または2記載の複合シート。
- 前記非弾性シートは、前記第2凸条部において、前記弾性シートから離間されて空隙が形成される請求項1〜3のいずれかに記載の複合シート。
- 前記弾性シートは、前記第1凸条部において、少なくともその一部が前記非弾性シートに接触される請求項1〜4のいずれかに記載の複合シート。
- 前記接合部は、前記横方向へ延びる仮想線に沿って離間して設けられ、前記仮想線は、前記横方向へ離間して複数配置され、隣接する前記仮想線における前記接合部は、前記縦方向において互いに重ならない位置関係を有する請求項1〜5のいずれかに記載の複合シート。
- 弾性シートおよび非弾性シートを接合する多数の接合部と、前記接合部に重なるとともに前記弾性シートに形成された第1凹条部と、前記第1凹条部に隣接する第1凸条部と、前記接合部に重なるとともに前記非弾性シートに形成された第2凹条部と、前記第1凸条部に交差する方向へ延びる第2凸条部と有する複合シートの製造方法であって、
前記弾性シートを構成する弾性ウェブを第1巻出しロールによって搬送する工程と、
前記弾性ウェブをニップロールを介してソニックホーンおよびこれに対向するアンビルを有する超音波装置へ搬送する工程と、
前記非弾性シートを構成する非弾性ウェブを第2巻出しロールによって前記超音波装置へと搬送する工程と、
前記弾性ウェブと前記非弾性ウェブとを、前記超音波装置によって接合する工程とを含み、
前記アンビルの周面には、回転方向および軸方向へそれぞれ離間する多数の凸部が設けられ、前記弾性ウェブは、前記周面に接触して搬送されるとともに、前記アンビルの回転速度は、前記ニップロールの回転速度よりも速くされることを特徴とする前記製造方法。 - 前記弾性ウェブは、前記アンビルと前記ニップロールとの間で、機械方向に伸長されるとともに、その伸長前よりも伸長後の方が前記機械方向に直交する交差方向における寸法が小さくされる請求項7記載の製造方法。
- 前記弾性ウェブが、一対のギアロールによって延伸加工される工程をさらに含み、延伸加工された前記弾性シートに前記接合部が形成される請求項7または8記載の製造方法。
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JP2012103908A JP5783951B2 (ja) | 2012-04-27 | 2012-04-27 | 複合シートおよび複合シートの製造方法 |
TW102114834A TWI588313B (zh) | 2012-04-27 | 2013-04-25 | Composite sheet and composite sheet manufacturing method |
PCT/JP2013/062338 WO2013161983A1 (ja) | 2012-04-27 | 2013-04-26 | 複合シートおよび複合シートの製造方法 |
CN201380027291.7A CN104334341B (zh) | 2012-04-27 | 2013-04-26 | 复合片及复合片的制造方法 |
US14/397,291 US10052846B2 (en) | 2012-04-27 | 2013-04-26 | Composite sheet and method for manufacturing the same |
EP13782250.8A EP2842734B2 (en) | 2012-04-27 | 2013-04-26 | Composite sheet and method for manufacturing composite sheet |
US15/884,943 US10022936B2 (en) | 2012-04-27 | 2018-01-31 | Composite sheet and method for manufacturing the same |
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JP2013231249A (ja) | 2013-11-14 |
CN104334341A (zh) | 2015-02-04 |
EP2842734B2 (en) | 2019-11-27 |
WO2013161983A1 (ja) | 2013-10-31 |
CN104334341B (zh) | 2017-06-30 |
EP2842734B1 (en) | 2017-01-04 |
EP2842734A4 (en) | 2015-12-02 |
TW201404963A (zh) | 2014-02-01 |
US20150147530A1 (en) | 2015-05-28 |
EP2842734A1 (en) | 2015-03-04 |
TWI588313B (zh) | 2017-06-21 |
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