JP2020143381A - Nonwoven fabric material manufacturing method and nonwoven fabric bag - Google Patents

Nonwoven fabric material manufacturing method and nonwoven fabric bag Download PDF

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JP2020143381A
JP2020143381A JP2019038132A JP2019038132A JP2020143381A JP 2020143381 A JP2020143381 A JP 2020143381A JP 2019038132 A JP2019038132 A JP 2019038132A JP 2019038132 A JP2019038132 A JP 2019038132A JP 2020143381 A JP2020143381 A JP 2020143381A
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woven fabric
strip
seal portion
shaped
shaped seal
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JP6651187B1 (en
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正克 篠原
masakatsu Shinohara
正克 篠原
輝美 北野
terumi Kitano
輝美 北野
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Tokiwa Kogyo Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Nonwoven Fabrics (AREA)
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Abstract

To provide a nonwoven fabric manufacturing method, which improves tensile strength at a fused part of a nonwoven fabric formed of biodegradable polylactic acid-based resin fibers in a heat seal process due to factors other than main four parameters of temperature, speed, pressing pressure and keeping time applied to the nonwoven fabric, and a nonwoven fabric material.SOLUTION: An abutment surface 4 of a heat seal cutter 1 has a first abutment surface 4x and a second abutment surface 4y. A first belt-like seal portion 31 and a second belt-like seal portion 32 are formed of the first abutment surface 4x and the second abutment surface 4y. A belt-like non-seal portion 33 is formed between the belt-like seal portions 31 and 32. A belt-like seal portion 30 is formed of the belt-like seal portions 31 and 32. A first nonwoven fabric material 51 and a second non-woven fabric material 52 are formed by cutting the belt-like non-seal portions 33 and 33z. The first belt-like seal portion 31 becomes the belt-like seal portion 30 remaining on the first nonwoven fabric material 51, and the second belt-like seal portion 32 becomes the belt-like seal portion 30 remaining on the second nonwoven fabric material 52.SELECTED DRAWING: Figure 1

Description

本発明は、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布材の製造方法及び不織布材に関する。 The present invention relates to a method for producing a nonwoven fabric material made of biodegradable polylactic acid resin fibers and a nonwoven fabric material.

例えば、お茶バッグ、ダシバッグ、若しくは生薬の煎じバッグのような抽出用バッグ、又は流し台などの排水口に用いるゴミ取りフィルターのようなフィルターなどに多く使われている不織布には、ポリエチレン、ポリプロピレン、ポリエステル、ポリアミド等の樹脂が用いられている（例えば特許文献１）。
これらの樹脂は、自己分解性がなく、自然環境下で極めて安定であるため、近年では環境に与える負荷が小さい、生分解性素材が着目されている。
特許文献２は、ポリ乳酸及び／又はポリ乳酸を主体とする熱可塑性重合体よりなる２種成分の芯鞘型複合長繊維にて構成され、ポリ乳酸とポリ乳酸を主体とする熱可塑性重合体とは融点が１００℃以上であり、鞘成分の融点は芯成分の融点よりも低い不織布を提案しており、このような不織布によれば容易に深絞り成型品を得ることができ、しかも成型品にヒートシール性を具備させ、また成型品に生分解性を付与できるとしている。
特許文献３は、生分解性を有する繊維からなることで使用後のコンポスト処理や埋め立てにより最終的には炭酸ガスと水に戻ることができ、袋体にする時にヒートシールが可能であり、濡れた時でも強度を維持するようなバインダー繊維を含有した、生分解性の飲料用フィルターバッグを提案している。そして、生分解性を有する主体となる短繊維は、生分解性を有する脂肪族ポリエステル系熱融着短繊維であり、脂肪族ポリエステル系熱融着短繊維が、高融点成分と、この高融点成分よりも融点が２０℃以上低い低融点成分とを有する複合繊維であり、これら高融点成分と低融点成分とのいずれもがポリ乳酸にて形成されていることが好ましいとされ、芯部を融点１７０℃以上のポリ乳酸、鞘部を融点１３０℃程度のポリ乳酸とした芯鞘型の複合繊維が、熱融着加工のし易さ、接着力の高さの点から、好ましいとされている。なぜなら、ある程度融点差のあるポリ乳酸を組み合わせた芯鞘型の複合繊維を熱融着短繊維とすると、熱融着加工の際に芯部が溶融せず繊維形態を維持するため、熱融着短繊維がフィルム状に潰れるのを避けることができるからである。
特許文献４は、ポリ乳酸系重合体の長繊維及び極細繊維から構成された生分解性の積層不織布からなり、長繊維不織布を繊径１０〜２０μｍ、目付１０〜４０ｇ／ｍ２とし、極細繊維不織布を繊径１〜１０μｍ、目付１〜１０ｇ／ｍ２として、２種類の不織布が熱圧着により一体化された積層不織布を提案しており、このような積層不織布は、粉漏れ性、ヒートシール強度、透明性、機械的強度等に優れるとしている。
特許文献５は、低結晶性ポリ乳酸樹脂（Ａ）とポリブチレンサクシネート樹脂（Ｂ）とを、（Ａ）／（Ｂ）＝１０／９０〜９０／１０の重量割合で含有する生分解性樹脂組成物を提案しており、このような生分解性樹脂組成物は、生分解性のポリ乳酸樹脂を含有しながらも成型時に優れた加工性を示すとしている。
特許文献６は、結晶化度が９．０％以下で繊維径が１５．０μm以下のポリ乳酸系樹脂の繊維からなり目付が２．０〜３０．０g／m2であるメルトブロー不織布により形成された層と、結晶化度が３０．０〜６０．０％で繊維径が３５．０μm以下のポリ乳酸系樹脂の繊維からなり目付が５．０〜３０．０g／m2であるスパンボンド不織布により形成された層とを有する多層状の抽出用シートを提案しており、このような抽出用シートは、製造時の機械適性が高いとしている。 For example, polyethylene, polypropylene, polyester are used as non-woven fabrics that are often used for extraction bags such as tea bags, dashi bags, and decoction bags for raw medicine, or filters such as dust removal filters used for drains such as sinks. , Polyamide and other resins are used (for example, Patent Document 1).
Since these resins do not have autolysis and are extremely stable in the natural environment, biodegradable materials that have a small impact on the environment have been attracting attention in recent years.
Patent Document 2 is composed of a core-sheath type composite long fiber composed of polylactic acid and / or a thermoplastic polymer mainly composed of polylactic acid, and is a thermoplastic polymer mainly composed of polylactic acid and polylactic acid. Proposes a non-woven fabric having a melting point of 100 ° C. or higher and a lower melting point of the sheath component than the melting point of the core component. According to such a non-woven fabric, a deeply drawn molded product can be easily obtained and molded. It is said that the product can be provided with heat sealability and the molded product can be provided with biodegradability.
Patent Document 3 is made of biodegradable fiber, so that it can be finally returned to carbon dioxide and water by composting or landfilling after use, and can be heat-sealed when it is made into a bag, and it gets wet. We are proposing a biodegradable beverage filter bag containing binder fiber that maintains its strength even when it is used. The main short fibers having biodegradability are aliphatic polyester-based heat-fused short fibers having biodegradability, and the aliphatic polyester-based heat-fused short fibers have a high melting point component and this high melting point. It is a composite fiber having a low melting point component having a melting point of 20 ° C. or more lower than that of the component, and it is preferable that both the high melting point component and the low melting point component are formed of polylactic acid, and the core portion is formed. A core-sheath type composite fiber having a polylactic acid having a melting point of 170 ° C. or higher and a polylactic acid having a sheath having a melting point of about 130 ° C. is preferable from the viewpoint of ease of heat fusion processing and high adhesive strength. There is. This is because if a core-sheath type composite fiber in which polylactic acid having a certain melting point difference is used as a heat-sealed short fiber, the core portion does not melt during the heat-sealing process and the fiber morphology is maintained. This is because it is possible to prevent the short fibers from being crushed into a film.
Patent Document 4 comprises a biodegradable laminated non-woven fabric composed of long fibers and ultrafine fibers of a polylactic acid-based polymer, and the long fiber non-woven fabric has a fiber diameter of 10 to 20 μm and a grain size of 10 to 40 g / m 2. We have proposed a laminated non-woven fabric in which two types of non-woven fabrics are integrated by thermal pressure bonding, with a fiber diameter of 1 to 10 μm and a grain size of 1 to 10 g / m 2 , and such laminated non-woven fabrics are powder leakable and heat-sealed. It is said to be excellent in strength, transparency, mechanical strength, etc.
Patent Document 5 is a biodegradable substance containing a low crystalline polylactic acid resin (A) and a polybutylene succinate resin (B) in a weight ratio of (A) / (B) = 10/90 to 90/10. We have proposed a resin composition, and it is said that such a biodegradable resin composition exhibits excellent processability at the time of molding while containing a biodegradable polylactic acid resin.
Patent Document 6 is made of a polylactic acid resin fiber having a crystallinity of 9.0% or less and a fiber diameter of 15.0 μm or less, and is formed of a melt-blown non-woven fabric having a grain size of 2.0 to 30.0 g / m 2. A spunbonded non-woven fabric consisting of a layer and a polylactic acid resin fiber having a crystallinity of 30.0 to 60.0% and a fiber diameter of 35.0 μm or less and having a grain size of 5.0 to 30.0 g / m 2. We have proposed a multi-layered extraction sheet having a layer formed by, and it is said that such an extraction sheet has high mechanical suitability at the time of manufacture.

特許６３９３７９９号公報Japanese Patent No. 6393799 特開２０００−１３６４７８号公報Japanese Unexamined Patent Publication No. 2000-136478 特開２００２−１７７１４８号公報Japanese Unexamined Patent Publication No. 2002-177148 特開２０１１−１５７１１８号公報Japanese Unexamined Patent Publication No. 2011-157118 特開２００６−２３３２１７号公報JP-A-2006-233217 特開２０１６−１６８５６９号公報Japanese Unexamined Patent Publication No. 2016-168569

特許文献２から特許文献６に記載されるように、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布材を用いる場合には、ポリエチレン等の樹脂を用いた不織布と比較して、シール強度を含めて課題があり、融点や繊維長などの異なる複数繊維を複合させることでシール強度などの向上を図っている。
ところで、ポリエチレン等の樹脂を用いた不織布では、不織布材の製造工程におけるシール強度を向上する場合、不織布に加える温度、速度、押し圧力、及びキープ時間の４つを主なパラメータとし、これらのパラメータを調整することによって、目的とするシール強度を得ることが技術常識である。
特許文献１には、不織布シートに二重線の融着部を設け、融着部の間を切断することで飲食用抽出袋を形成することが開示されている。なお、特許文献１は、ポリエチレン等の樹脂を用いた従来の不織布であり、ポリ乳酸系樹脂の繊維からなるものではない。
特許文献１に記載されるように、ポリエチレン等の樹脂を用いた従来の不織布では、二重線の融着部としても、シール強度に影響を与えないことを図５及び図６に示す。
図５は実証試験に用いたお茶バッグの形状を示す図であり、図５（ａ）は特許文献１に記載のような二重線の融着部から切り離したお茶バッグの形状、図５（ｂ）は二重線ではなく１本の太い帯状の融着部から切り離したお茶バッグの形状である。
実証試験に用いた不織布は、ポリエステル／ポリエチレン複合繊維を基材としたエアースルー法による短繊維不織布である（品名Ｔ１８Ｊ−ＨＲ）。
この不織布は、目付の水準値が１８．０ｇ／ｍ２、厚さ０．７０ｍｍ、引張強度が横方向０．３０ｋｇｆ／２５ｍｍ以上、縦方向１．５０ｋｇｆ／２５ｍｍ以上である。
お茶バッグの製造における、不織布に加える温度、速度、押し圧力、及びキープ時間の４つのパラメータはいずれも同じとした。
図５（ａ）に示すお茶バッグは、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが２ｍｍ、寸法Ｉが２ｍｍ、寸法Ｊが４ｍｍ、寸法Ｋが１５ｍｍである。寸法Ｈ、寸法Ｉ、及び寸法Ｊが融着部である。
図５（ｂ）に示すお茶バッグは、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが４ｍｍ、寸法Ｉが１５ｍｍである。寸法Ｆ、寸法Ｇ、及び寸法Ｈが融着部である。
引張試験には、２枚の不織布シートだけが積層されて融着される箇所Ｚを切り取って行った。
引張試験測定器には、株式会社今田製作所製ＳＶ−５５Ｃ ２０Ｈを用いた。
図６は実証試験の結果を示す図であり、図６（ａ）は特許文献１に記載のような二重線の融着部から切り離したお茶バッグの引張強度、図６（ｂ）は二重線ではなく１本の太い帯状の融着部から切り離したお茶バッグの引張強度である。図６において縦軸は引張強度を示し、数値が大きくなるほど（上方）引張強度が高い。
図６に示すように、ポリエチレン等の樹脂を用いた不織布では、１本の太い帯状の融着部から切り離した場合と、二重線の融着部から切り離した場合とでは引張強度に違いは生じていない。
このように、ポリエチレン等の樹脂を用いた不織布では、二重線の融着部としてもシール強度に影響を与えない。
次に、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布を用いてお茶バッグを製造した際の実証実験について図７及び図８を用いて説明する。
図７（ａ）に示すように、お茶バッグの製造工程におけるヒートシール工程では、熱シール刃物１が外周面に配置された熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させる。
当接面４は熱シールローラ２の軸方向に形成している。従って、熱シール刃物１の当接面４が、第１不織布シート１０と第２不織布シート２０とを押圧及び加熱することで、第１不織布シート１０と第２不織布シート２０とが融着された帯状シール部３０が形成される（図７（ｂ））。
図７（ｂ）に示すように、帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成される。
そして、帯状シール部３０を切断することで、図７（ｃ）に示すように、帯状シール部３０の一部が残存した状態の第１不織布材５１と、帯状シール部３０の一部が残存した状態の第２不織布材５２に分離する。
ところで、図７（ｃ）に示す不織布材を、第１不織布材５１とすると、一方の帯状シール部３０Ｆは、熱シール刃物１の当接面４における、熱シールローラ２の回転方向前側部分によって形成され、他方の帯状シール部３０Ｂは、熱シール刃物１の当接面４における、熱シールローラ２の回転方向後側部分によって形成されている。
図８（ａ）は、熱シールローラ２の回転方向前側部分によって形成される一方の帯状シール部３０Ｆの引張強度を示し、図８（ｂ）は、熱シールローラ２の回転方向後側部分によって形成される他方の帯状シール部３０Ｂの引張強度を示している。
図８（ａ）に示す帯状シール部３０Ｆの引張強度が、図８（ｂ）に示す帯状シール部３０Ｂの引張強度よりも高くなっている。
本発明は、熱シールローラ２の回転方向前側部分によって形成される一方の帯状シール部３０Ｆの引張強度と、熱シールローラ２の回転方向後側部分によって形成される他方の帯状シール部３０Ｂの引張強度との相違に着目したものである。 As described in Patent Documents 2 to 6, when a non-woven fabric material made of biodegradable polylactic acid resin fibers is used, the sealing strength is higher than that of a non-woven fabric using a resin such as polyethylene. There are problems including the above, and we are trying to improve the sealing strength by combining multiple fibers with different melting points and fiber lengths.
By the way, in the case of a non-woven fabric using a resin such as polyethylene, when improving the sealing strength in the manufacturing process of the non-woven fabric material, four main parameters are the temperature, speed, pressing pressure, and keeping time applied to the non-woven fabric, and these parameters are used. It is a common technical knowledge to obtain the desired sealing strength by adjusting the above.
Patent Document 1 discloses that a non-woven fabric sheet is provided with a fused portion of a double wire, and a food and drink extraction bag is formed by cutting between the fused portions. Note that Patent Document 1 is a conventional non-woven fabric using a resin such as polyethylene, and is not made of polylactic acid-based resin fibers.
As described in Patent Document 1, it is shown in FIGS. 5 and 6 that a conventional non-woven fabric using a resin such as polyethylene does not affect the sealing strength even as a fused portion of double wires.
FIG. 5 is a diagram showing the shape of the tea bag used in the verification test, and FIG. 5 (a) shows the shape of the tea bag separated from the fused portion of the double line as described in Patent Document 1, FIG. 5 (a). b) is not a double line but a shape of a tea bag separated from one thick band-shaped fusion part.
The non-woven fabric used in the verification test is a short-fiber non-woven fabric using a polyester / polyethylene composite fiber as a base material by an air-through method (product name T18J-HR).
This non-woven fabric has a basis weight of 18.0 g / m 2 , a thickness of 0.70 mm, a tensile strength of 0.30 kgf / 25 mm or more in the horizontal direction, and 1.50 kgf / 25 mm or more in the vertical direction.
The four parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric in the production of the tea bag were all the same.
The tea bag shown in FIG. 5A has a dimension A of 95 mm, a dimension B of 70 mm, a dimension C of 31 mm, a dimension D of 13 mm, a dimension E of 84 mm, a dimension F of 3.5 mm, and a dimension G of 3.5 mm. The dimension H is 2 mm, the dimension I is 2 mm, the dimension J is 4 mm, and the dimension K is 15 mm. Dimension H, Dimension I, and Dimension J are fused portions.
The tea bag shown in FIG. 5B has a dimension A of 95 mm, a dimension B of 70 mm, a dimension C of 31 mm, a dimension D of 13 mm, a dimension E of 84 mm, a dimension F of 3.5 mm, and a dimension G of 3.5 mm. The dimension H is 4 mm and the dimension I is 15 mm. Dimension F, Dimension G, and Dimension H are fused portions.
In the tensile test, a portion Z where only two non-woven fabric sheets were laminated and fused was cut out.
As the tensile test measuring instrument, SV-55C 20H manufactured by Imada Seisakusho Co., Ltd. was used.
FIG. 6 is a diagram showing the results of the verification test, FIG. 6 (a) is the tensile strength of the tea bag separated from the fused portion of the double wire as described in Patent Document 1, and FIG. 6 (b) is the second. It is the tensile strength of the tea bag separated from one thick band-shaped fusion part instead of the heavy wire. In FIG. 6, the vertical axis indicates the tensile strength, and the larger the value, the higher the (upward) tensile strength.
As shown in FIG. 6, in the non-woven fabric using a resin such as polyethylene, there is a difference in tensile strength between the case where the non-woven fabric is separated from the one thick band-shaped fusion part and the case where the non-woven fabric is separated from the fusion part of the double wire. Not happening.
As described above, in the non-woven fabric using a resin such as polyethylene, the sealing strength is not affected even as the fused portion of the double wire.
Next, a demonstration experiment when a tea bag is manufactured using a non-woven fabric made of biodegradable polylactic acid resin fibers will be described with reference to FIGS. 7 and 8.
As shown in FIG. 7A, in the heat sealing step in the tea bag manufacturing process, the first non-woven fabric sheet is placed between the heat sealing roller 2 in which the heat sealing blade 1 is arranged on the outer peripheral surface and the receiving side roller 3. The 10 and the second non-woven fabric sheet 20 are passed in a stacked state.
The contact surface 4 is formed in the axial direction of the heat seal roller 2. Therefore, the contact surface 4 of the heat-sealing blade 1 presses and heats the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20, so that the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are fused. A strip-shaped seal portion 30 is formed (FIG. 7 (b)).
As shown in FIG. 7B, the first non-woven fabric material 51 is formed by the first non-woven fabric sheet piece 11F and the second non-woven fabric sheet piece 21F located on one side of the strip-shaped seal portion 30, and the other of the strip-shaped seal portions 30. The second non-woven fabric material 52 is formed by the other first non-woven fabric sheet piece 11B and the other second non-woven fabric sheet piece 21B located in.
Then, by cutting the strip-shaped seal portion 30, as shown in FIG. 7C, the first non-woven fabric material 51 in a state where a part of the strip-shaped seal portion 30 remains and a part of the strip-shaped seal portion 30 remain. It is separated into the second non-woven fabric material 52 in the state of being separated.
By the way, assuming that the non-woven material shown in FIG. 7C is the first non-woven material 51, one strip-shaped sealing portion 30F is formed by a front portion in the rotation direction of the heat-sealing roller 2 on the contact surface 4 of the heat-sealing blade 1. The other strip-shaped seal portion 30B is formed by a portion of the contact surface 4 of the heat seal blade 1 on the rear side in the rotation direction of the heat seal roller 2.
FIG. 8 (a) shows the tensile strength of one strip-shaped seal portion 30F formed by the front side portion in the rotation direction of the heat seal roller 2, and FIG. 8 (b) shows the tensile strength of one strip-shaped seal portion 30F formed by the rear portion in the rotation direction of the heat seal roller 2. It shows the tensile strength of the other strip-shaped seal portion 30B to be formed.
The tensile strength of the strip-shaped seal portion 30F shown in FIG. 8 (a) is higher than the tensile strength of the strip-shaped seal portion 30B shown in FIG. 8 (b).
In the present invention, the tensile strength of one strip-shaped seal portion 30F formed by the front side portion of the heat seal roller 2 in the rotation direction and the tension of the other strip-shaped seal portion 30B formed by the rear portion of the heat seal roller 2 in the rotation direction. It focuses on the difference from the strength.

本発明は、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上をヒートシール工程において行うことができる不織布材の製造方法、及び引張強度の高いポリ乳酸系樹脂の繊維からなる不織布材を提供することを目的とする。 In the present invention, the tensile strength at the fusion site of a non-woven fabric made of biodegradable polylactic acid resin fibers due to factors other than the four main parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric. It is an object of the present invention to provide a method for producing a nonwoven fabric material which can be improved in the heat sealing step, and to provide a nonwoven fabric material made of polylactic acid-based resin fibers having high tensile strength.

請求項１記載の本発明の不織布材の製造方法は、熱シールローラ２の軸方向に当接面４を形成する熱シール刃物１が前記熱シールローラ２の外周面に配置され、前記熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させ、前記熱シール刃物１の前記当接面４が、前記第１不織布シート１０と前記第２不織布シート２０とを押圧及び加熱することで、前記第１不織布シート１０と前記第２不織布シート２０とが融着された前記帯状シール部３０が形成され、前記帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、前記帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成され、前記帯状シール部３０を切断することで、前記帯状シール部３０の一部が残存した状態の前記第１不織布材５１と、前記帯状シール部３０の一部が残存した状態の前記第２不織布材５２に分離する不織布材の製造方法であって、前記第１不織布シート１０と前記第２不織布シート２０とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、前記熱シール刃物１の前記当接面４が、前記熱シールローラ２の前記軸方向に延び、互いを離間させた第１当接面４ｘと第２当接面４ｙとを有し、前記第１当接面４ｘによって第１帯状シール部３１が形成され、前記第２当接面４ｙによって第２帯状シール部３２が形成され、前記第１帯状シール部３１と前記第２帯状シール部３２との間には、帯状非シール部３３が形成され、前記第１帯状シール部３１と前記第２帯状シール部３２とによって前記帯状シール部３０が形成され、前記帯状非シール部３３を切断することで前記第１不織布材５１と前記第２不織布材５２とを形成し、前記第１帯状シール部３１が、前記第１不織布材５１に残存する前記帯状シール部３０となり、前記第２帯状シール部３２が、前記第２不織布材５２に残存する前記帯状シール部３０となることを特徴とする。
請求項２記載の本発明の不織布材は、第１不織布シート片１１と第２不織布シート片２１との少なくとも一部が帯状シール部３０によって融着されている不織布材であって、前記第１不織布シート片１１と前記第２不織布シート片２１とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、前記帯状シール部３０の両側方には、前記第１不織布シート片１１と前記第２不織布シート片２１とが融着されていない帯状非シール部３３、３３ｚを有することを特徴とする。 In the method for producing a non-woven material of the present invention according to claim 1, the heat-sealing blade 1 forming the contact surface 4 in the axial direction of the heat-sealing roller 2 is arranged on the outer peripheral surface of the heat-sealing roller 2, and the heat-sealing is performed. The first non-woven sheet 10 and the second non-woven sheet 20 are passed between the roller 2 and the receiving roller 3 in a superposed state, and the contact surface 4 of the heat-sealing blade 1 is the first non-woven sheet. By pressing and heating the 10 and the second non-woven sheet 20, the strip-shaped seal portion 30 in which the first non-woven sheet 10 and the second non-woven sheet 20 are fused is formed, and the strip-shaped seal portion 30 is formed. The first non-woven material 51 is formed by the one-sided first non-woven sheet sheet piece 11F and the other second non-woven sheet sheet piece 21F located on one side, and the other first non-woven sheet sheet piece 11B and the other first non-woven sheet piece 11B located on the other side of the strip-shaped sealing portion 30. The second non-woven material 52 is formed by the two non-woven sheet pieces 21B, and by cutting the strip-shaped seal portion 30, the first non-woven material 51 in a state where a part of the strip-shaped seal portion 30 remains and the strip-shaped seal. A method for producing a non-woven material that separates into the second non-woven material 52 in a state where a part of the portion 30 remains, wherein the first non-woven sheet 10 and the second non-woven sheet 20 are biodegradable polylactic acid. It is a non-woven fabric made of fibers of a system resin, and the contact surface 4 of the heat seal blade 1 extends in the axial direction of the heat seal roller 2 and is separated from each other by a first contact surface 4x and a second contact surface. It has a contact surface 4y, a first band-shaped seal portion 31 is formed by the first contact surface 4x, a second band-shaped seal portion 32 is formed by the second contact surface 4y, and the first band-shaped seal portion 32 is formed. A band-shaped non-seal portion 33 is formed between the 31 and the second band-shaped seal portion 32, and the band-shaped seal portion 30 is formed by the first band-shaped seal portion 31 and the second band-shaped seal portion 32. By cutting the strip-shaped non-seal portion 33, the first non-woven material 51 and the second non-woven material 52 are formed, and the first strip-shaped sealing portion 31 remains in the first non-woven material 51. The second strip-shaped seal portion 32 becomes the portion 30, and the second strip-shaped seal portion 32 becomes the strip-shaped seal portion 30 remaining on the second non-woven material 52.
The non-woven fabric material of the present invention according to claim 2 is a non-woven fabric material in which at least a part of the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 is fused by a strip-shaped sealing portion 30, and the first non-woven fabric material. The non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 are a non-woven fabric made of fibers of a polylactic acid-based resin having biodegradability, and the first non-woven fabric sheet piece 11 is provided on both sides of the strip-shaped sealing portion 30. It is characterized by having strip-shaped non-seal portions 33, 33z in which the second non-woven fabric sheet piece 21 is not fused.

本発明によれば、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上をヒートシール工程において行うことができる。 According to the present invention, in a fused portion of a non-woven fabric made of biodegradable polylactic acid resin fibers due to factors other than the four main parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric. The tensile strength can be improved in the heat sealing process.

本発明の一実施例による不織布材の製造方法及び不織布材の製造方法に用いる装置を示す図The figure which shows the manufacturing method of the nonwoven fabric material and the apparatus used for the manufacturing method of the nonwoven fabric material by one Example of this invention. 本実施例によって製造される不織布材を示す図The figure which shows the non-woven fabric material produced by this Example 本実施例の不織布材の引張強度の実証実験の結果を示す図The figure which shows the result of the demonstration experiment of the tensile strength of the non-woven fabric material of this Example. 比較例として製造された不織布材を示す図The figure which shows the non-woven fabric material manufactured as a comparative example. 実証試験に用いたお茶バッグの形状を示す図The figure which shows the shape of the tea bag used for the verification test 実証試験の結果を示す図Diagram showing the results of the verification test 生分解性を有するポリ乳酸系樹脂の繊維からなる不織布を用いてお茶バッグを製造した際の実証実験Demonstration experiment when manufacturing a tea bag using a non-woven fabric made of biodegradable polylactic acid resin fibers 熱シールローラの回転方向前側部分によって形成される一方の帯状シール部と、熱シールローラの回転方向後側部分によって形成される他方の帯状シール部との引張強度を示す図The figure which shows the tensile strength of one strip-shaped seal part formed by the front side part in the rotation direction of a heat seal roller, and the other strip-shaped seal part formed by the rear side part in a rotation direction of a heat seal roller.

本発明の第１の実施の形態による不織布材の製造方法は、第１不織布シートと第２不織布シートとが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、熱シール刃物の当接面が、熱シールローラの軸方向に延び、互いを離間させた第１当接面と第２当接面とを有し、第１当接面によって第１帯状シール部が形成され、第２当接面によって第２帯状シール部が形成され、第１帯状シール部と第２帯状シール部との間には、帯状非シール部が形成され、第１帯状シール部と第２帯状シール部とによって帯状シール部が形成され、帯状非シール部を切断することで第１不織布材と第２不織布材とを形成し、第１帯状シール部が、第１不織布材に残存する帯状シール部となり、第２帯状シール部が、第２不織布材に残存する帯状シール部となるものである。
本実施の形態によれば、第１当接面によって第１帯状シール部が形成され、第２当接面によって第２帯状シール部が形成され、第１帯状シール部と第２帯状シール部との間には、帯状非シール部が形成されることで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上を、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、ヒートシール工程において行うことができる。 The method for producing a non-woven fabric material according to the first embodiment of the present invention is a non-woven fabric in which the first non-woven fabric sheet and the second non-woven fabric sheet are made of polylactic acid-based resin fibers having biodegradability, and is a heat-sealing blade. The contact surface extends in the axial direction of the heat-sealing roller and has a first contact surface and a second contact surface separated from each other, and the first contact surface forms a first strip-shaped sealing portion. A second strip-shaped seal portion is formed by the two contact surfaces, a strip-shaped non-woven fabric portion is formed between the first strip-shaped seal portion and the second strip-shaped seal portion, and the first strip-shaped seal portion and the second strip-shaped seal portion are formed. A strip-shaped seal portion is formed by the above, and the first non-woven fabric material and the second non-woven fabric material are formed by cutting the strip-shaped non-seal portion, and the first non-woven fabric material becomes the strip-shaped seal portion remaining in the first non-woven fabric material. The second strip-shaped seal portion serves as a strip-shaped seal portion remaining on the second non-woven fabric material.
According to the present embodiment, the first band-shaped seal portion is formed by the first contact surface, the second band-shaped seal portion is formed by the second contact surface, and the first band-shaped seal portion and the second band-shaped seal portion are formed. By forming a band-shaped non-seal portion between them, the temperature, speed, and pressing of the non-woven fabric, which is made of biodegradable polylactic acid-based resin fibers, are applied to improve the tensile strength at the fused portion of the non-woven fabric. Factors other than the four main parameters of pressure and keep time can be used in the heat seal process.

本発明の第２の実施の形態による不織布材は、第１不織布シート片と第２不織布シート片とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、帯状シール部の両側方には、第１不織布シート片と第２不織布シート片とが融着されていない帯状非シール部を有するものである。
本実施の形態によれば、帯状シール部の両側方に帯状非シール部を有することで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。 The nonwoven fabric material according to the second embodiment of the present invention is a nonwoven fabric in which the first nonwoven fabric sheet piece and the second nonwoven fabric sheet piece are made of polylactic acid-based resin fibers having biodegradability, and both sides of the strip-shaped sealing portion. Has a strip-shaped non-seal portion in which the first non-woven fabric sheet piece and the second non-woven fabric sheet piece are not fused.
According to the present embodiment, by having the strip-shaped non-sealing portions on both sides of the strip-shaped sealing portion, the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers is improved. Can be done.

以下本発明の一実施例による不織布材の製造方法について説明する。
図１は本実施例による不織布材の製造方法及び不織布材の製造方法に用いる装置を示す図である。
図１（ａ）及び図１（ｂ）に示すように、不織布材の製造工程におけるヒートシール工程では、熱シール刃物１が外周面に配置された熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させる。
第１不織布シート１０と第２不織布シート２０とは、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布である。
本実施例による第１不織布シート１０及び第２不織布シート２０は、融点が１６０℃〜１７０℃で一定条件下での生分解性を有する不織布である。
当接面４は熱シールローラ２の軸方向に形成している。受け側ローラ３の上流側にはギア５のバッククラッシュを防ぐ補助ローラ６を設けている。
図１（ｃ）及び図１（ｄ）に示すように、熱シール刃物１の当接面４は、熱シールローラ２の軸方向に延び、互いを離間させた第１当接面４ｘと第２当接面４ｙとを有している。
第１当接面４ｘは熱シールローラ２の回転方向前側角部４ｆを、第２当接面４ｙは熱シールローラ２の回転方向前側角部４ｆを有している。
熱シール刃物１の当接面４が、第１不織布シート１０と第２不織布シート２０とを押圧及び加熱することで、第１不織布シート１０と第２不織布シート２０とが融着された帯状シール部３０（図２参照）が形成される。 Hereinafter, a method for producing a nonwoven fabric material according to an embodiment of the present invention will be described.
FIG. 1 is a diagram showing a method for producing a nonwoven fabric material and an apparatus used for the method for producing a nonwoven fabric material according to this embodiment.
As shown in FIGS. 1 (a) and 1 (b), in the heat sealing step in the manufacturing process of the non-woven fabric material, the heat sealing blade 1 is placed between the heat sealing roller 2 arranged on the outer peripheral surface and the receiving roller 3. The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are passed through in a stacked state.
The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are non-woven fabrics made of biodegradable polylactic acid-based resin fibers.
The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 according to this embodiment are non-woven fabrics having a melting point of 160 ° C. to 170 ° C. and having biodegradability under certain conditions.
The contact surface 4 is formed in the axial direction of the heat seal roller 2. An auxiliary roller 6 for preventing backlash of the gear 5 is provided on the upstream side of the receiving roller 3.
As shown in FIGS. 1 (c) and 1 (d), the contact surface 4 of the heat-sealing blade 1 extends in the axial direction of the heat-sealing roller 2 and is separated from the first contact surface 4x. It has two contact surfaces 4y.
The first contact surface 4x has a front corner portion 4f in the rotation direction of the heat seal roller 2, and the second contact surface 4y has a front corner portion 4f in the rotation direction of the heat seal roller 2.
The contact surface 4 of the heat-sealing blade 1 presses and heats the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20, so that the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are fused to each other. A portion 30 (see FIG. 2) is formed.

図２は本実施例によって製造される不織布材を示す図である。
図２（ａ）に示すように、帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成される。
帯状シール部３０は、第１帯状シール部３１と第２帯状シール部３２とによって形成される。第１帯状シール部３１は第１当接面４ｘによって形成され、第２帯状シール部３２は第２当接面４ｙによって形成される。
第１帯状シール部３１と第２帯状シール部３２との間には、帯状非シール部３３が形成される。
そして、帯状非シール部３３を切断することで、図２（ｂ）に示すように、帯状シール部３０の一部が残存した状態の第１不織布材５１と、帯状シール部３０の一部が残存した状態の第２不織布材５２に分離する。
第１不織布材５１に残存する一方の帯状シール部が第２帯状シール部３２となり、第１不織布材５１に残存する他方の帯状シール部が第１帯状シール部３１となる。
また、第２不織布材５２に残存する一方の帯状シール部が第１帯状シール部３１となり、第２不織布材５２に残存する他方の帯状シール部が第２帯状シール部３２となる。
図２（ｃ）は、本実施例の不織布材の形状及び寸法を示している。
本実施例による不織布材５１、５２では、１枚の不織布シートを折り畳むことで、第１不織布シート１０と第２不織布シート２０とを構成している。
図２（ｃ）に示すように、本実施例による不織布材５１、５２はお茶バッグであり、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが２ｍｍ、寸法Ｉが２ｍｍ、寸法Ｊが４ｍｍ、寸法Ｋが１５ｍｍである。寸法Ｈ、寸法Ｉ、及び寸法Ｊが融着部である。 FIG. 2 is a diagram showing a non-woven fabric material produced by this embodiment.
As shown in FIG. 2A, the first nonwoven fabric material 51 is formed by the first nonwoven fabric sheet piece 11F and the second nonwoven fabric sheet piece 21F located on one side of the strip-shaped sealing portion 30, and the other of the strip-shaped sealing portions 30. The second non-woven fabric material 52 is formed by the other first non-woven fabric sheet piece 11B and the other second non-woven fabric sheet piece 21B located in.
The strip-shaped seal portion 30 is formed by the first strip-shaped seal portion 31 and the second strip-shaped seal portion 32. The first band-shaped seal portion 31 is formed by the first contact surface 4x, and the second band-shaped seal portion 32 is formed by the second contact surface 4y.
A strip-shaped non-sealing portion 33 is formed between the first strip-shaped sealing portion 31 and the second strip-shaped sealing portion 32.
Then, by cutting the strip-shaped non-seal portion 33, as shown in FIG. 2B, the first non-woven fabric material 51 in a state where a part of the strip-shaped seal portion 30 remains and a part of the strip-shaped seal portion 30 are formed. It is separated into the second non-woven fabric material 52 in the remaining state.
One strip-shaped seal portion remaining on the first nonwoven fabric material 51 becomes the second strip-shaped seal portion 32, and the other strip-shaped seal portion remaining on the first nonwoven fabric material 51 becomes the first strip-shaped seal portion 31.
Further, one strip-shaped seal portion remaining on the second nonwoven fabric material 52 becomes the first strip-shaped seal portion 31, and the other strip-shaped seal portion remaining on the second nonwoven fabric material 52 becomes the second strip-shaped seal portion 32.
FIG. 2C shows the shape and dimensions of the nonwoven fabric material of this embodiment.
In the non-woven fabric materials 51 and 52 according to the present embodiment, the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are formed by folding one non-woven fabric sheet.
As shown in FIG. 2C, the non-woven fabric materials 51 and 52 according to the present embodiment are tea bags, and the dimensions A are 95 mm, the dimension B is 70 mm, the dimension C is 31 mm, the dimension D is 13 mm, and the dimension E is 84 mm. The dimension F is 3.5 mm, the dimension G is 3.5 mm, the dimension H is 2 mm, the dimension I is 2 mm, the dimension J is 4 mm, and the dimension K is 15 mm. Dimension H, Dimension I, and Dimension J are fused portions.

次に、本実施例の不織布材の製造方法によって製造した不織布材の引張強度の実証実験について図３及び図４を用いて説明する。
図３は本実施例の不織布材の引張強度の実証実験の結果を示す図であり、図３（ａ）は本実施例を示し、図３（ｂ）は比較例を示している。
本実施例及び比較例では、坪量が１８ｇ／ｍ２、厚さ０．０８ｍｍ、通気度２００〜４００ｃｃ／ｃｍ２／ｓｅｃ、引張強度が横方向２．０Ｎ／１５ｍｍ以上、縦方向９．５Ｎ／１５ｍｍ以上であるポリ乳酸系樹脂の繊維からなる不織布（ｓｕｓｔｉｃｏＫ４１２０６ＰＬＡ−Ｆ）を用いた。
なお、図４に示すように比較例は、帯状シール部３０が、１本の太い帯状の融着部で形成され、本実施例のように、第１帯状シール部３１及び第２帯状シール部３２としていない。不織布に加える温度、速度、押し圧力、及びキープ時間の４つのパラメータはいずれも同じ条件で製造した。
引張試験には、図５と同様に、２枚の不織布シートだけが積層されて融着される箇所Ｚを切り取って行った。引張試験測定器には、株式会社今田製作所製ＳＶ−５５Ｃ ２０Ｈを用いた。
図３（ａ）に示す本実施例の引張強度は、図３（ｂ）に示す比較例の引張強度よりも明らかに高くなっている。 Next, a demonstration experiment of the tensile strength of the nonwoven fabric material produced by the method for producing the nonwoven fabric material of this example will be described with reference to FIGS. 3 and 4.
FIG. 3 is a diagram showing the results of a demonstration experiment of the tensile strength of the nonwoven fabric material of this example, FIG. 3 (a) shows this example, and FIG. 3 (b) shows a comparative example.
In this example and comparative example, the basis weight is 18 g / m 2 , the thickness is 0.08 mm, the air permeability is 200 to 400 cc / cm 2 / sec, the tensile strength is 2.0 N / 15 mm or more in the horizontal direction, and 9.5 N in the vertical direction. A non-woven fabric (sustico K41206PLA-F) made of polylactic acid resin fibers having a size of / 15 mm or more was used.
In addition, as shown in FIG. 4, in the comparative example, the band-shaped seal portion 30 is formed by one thick band-shaped fused portion, and as in this embodiment, the first band-shaped seal portion 31 and the second band-shaped seal portion 31 Not set to 32. The four parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric were all manufactured under the same conditions.
In the tensile test, as in FIG. 5, a portion Z where only two non-woven fabric sheets were laminated and fused was cut out. As the tensile test measuring instrument, SV-55C 20H manufactured by Imada Seisakusho Co., Ltd. was used.
The tensile strength of this example shown in FIG. 3 (a) is clearly higher than that of the comparative example shown in FIG. 3 (b).

本実施例の不織布材５１、５２は、第１不織布シート片１１と第２不織布シート片２１とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、帯状シール部３１、３２の外側方には、第１不織布シート片１１と第２不織布シート片２１とが融着されていない帯状非シール部３３を有するものである。なお、帯状シール部３１、３２の内側方についても、帯状非シール部３３ｚを有している。
このように、帯状シール部３１、３２の両側方に帯状非シール部３３、３３ｚを有することで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。
特に、不織布材５１、５２に残存する帯状シール部３１、３２には、回転方向前側角部４ｆによって食い込み部が形成されることで、不織布の融着部での引張強度を向上させることができる。 The non-woven fabric materials 51 and 52 of this embodiment are non-woven fabrics in which the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 are made of polylactic acid-based resin fibers having biodegradability, and the strip-shaped sealing portions 31 and 32. On the outer side, the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 have a band-shaped non-seal portion 33 in which the non-woven fabric sheet piece 21 is not fused. The band-shaped non-sealing portions 33z are also provided inside the strip-shaped sealing portions 31 and 32.
By having the band-shaped non-sealing portions 33 and 33z on both sides of the strip-shaped sealing portions 31 and 32 in this way, the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers is improved. Can be made to.
In particular, the strip-shaped seal portions 31 and 32 remaining on the non-woven fabric materials 51 and 52 are formed with a bite portion by the front corner portion 4f in the rotation direction, so that the tensile strength at the fused portion of the nonwoven fabric can be improved. ..

本実施例の不織布材の製造方法によれば、第１当接面４ｘによって第１帯状シール部３１が形成され、第２当接面４ｙによって第２帯状シール部３２が形成され、第１帯状シール部３１と第２帯状シール部３２との間には、帯状非シール部３３が形成されることで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上を、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、ヒートシール工程において行うことができる。
なお、図２（ａ）に示すように、第１帯状シール部３１と第２帯状シール部３２とは部分的にシール部によって連接されていてもよい。 According to the method for producing a non-woven fabric material of this embodiment, the first contact surface 4x forms the first band-shaped seal portion 31, and the second contact surface 4y forms the second band-shaped seal portion 32, so that the first band-shaped seal portion 32 is formed. By forming a strip-shaped non-sealing portion 33 between the sealing portion 31 and the second strip-shaped sealing portion 32, the tensile strength of the non-woven fabric made of biodegradable polylactic acid-based resin fibers at the fused portion. The improvement can be made in the heat sealing process by factors other than the four main parameters of temperature, speed, pressing pressure and keep time applied to the non-woven fabric.
As shown in FIG. 2A, the first strip-shaped seal portion 31 and the second strip-shaped seal portion 32 may be partially connected by the seal portion.

本発明による不織布材の製造方法によれば、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。 According to the method for producing a non-woven fabric material according to the present invention, it is possible to improve the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers.

１ 熱シール刃物
２ 熱シールローラ
３ 受け側ローラ
４ 当接面
４ｆ 回転方向前側角部
４ｘ 第１当接面
４ｙ 第２当接面
５ ギア
６ 補助ローラ
１０ 第１不織布シート
１１ 第１不織布シート片
１１Ｂ 他方第１不織布シート片
１１Ｆ 一方第１不織布シート片
２０ 第２不織布シート
２１ 第２不織布シート片
２１Ｂ 他方第２不織布シート片
２１Ｆ 一方第２不織布シート片
３０ 帯状シール部
３１ 第１帯状シール部
３２ 第２帯状シール部
３３、３３ｚ 帯状非シール部
５１ 第１不織布材
５２ 第２不織布材 1 Heat-sealing blade 2 Heat-sealing roller 3 Receiving side roller 4 Contact surface 4f Rotation direction front side corner 4x 1st contact surface 4y 2nd contact surface 5 Gear 6 Auxiliary roller 10 1st non-woven fabric sheet 11 1st non-woven fabric sheet piece 11B On the other hand, 1st non-woven fabric sheet piece 11F On the other hand, 1st non-woven fabric sheet piece 20 2nd non-woven fabric sheet 21 2nd non-woven fabric sheet piece 21B On the other hand, 2nd non-woven fabric sheet piece 21F On the other hand, 2nd non-woven fabric sheet piece 30 2nd band-shaped seal part 33, 33z Band-shaped non-seal part 51 1st non-woven fabric material 52 2nd non-woven fabric material

本発明は、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布材の製造方法及び不織布材に関する。 The present invention relates to a method for producing a nonwoven fabric material made of biodegradable polylactic acid resin fibers and a nonwoven fabric material.

例えば、お茶バッグ、ダシバッグ、若しくは生薬の煎じバッグのような抽出用バッグ、又は流し台などの排水口に用いるゴミ取りフィルターのようなフィルターなどに多く使われている不織布には、ポリエチレン、ポリプロピレン、ポリエステル、ポリアミド等の樹脂が用いられている（例えば特許文献１）。
これらの樹脂は、自己分解性がなく、自然環境下で極めて安定であるため、近年では環境に与える負荷が小さい、生分解性素材が着目されている。
特許文献２は、ポリ乳酸及び／又はポリ乳酸を主体とする熱可塑性重合体よりなる２種成分の芯鞘型複合長繊維にて構成され、ポリ乳酸とポリ乳酸を主体とする熱可塑性重合体とは融点が１００℃以上であり、鞘成分の融点は芯成分の融点よりも低い不織布を提案しており、このような不織布によれば容易に深絞り成型品を得ることができ、しかも成型品にヒートシール性を具備させ、また成型品に生分解性を付与できるとしている。
特許文献３は、生分解性を有する繊維からなることで使用後のコンポスト処理や埋め立てにより最終的には炭酸ガスと水に戻ることができ、袋体にする時にヒートシールが可能であり、濡れた時でも強度を維持するようなバインダー繊維を含有した、生分解性の飲料用フィルターバッグを提案している。そして、生分解性を有する主体となる短繊維は、生分解性を有する脂肪族ポリエステル系熱融着短繊維であり、脂肪族ポリエステル系熱融着短繊維が、高融点成分と、この高融点成分よりも融点が２０℃以上低い低融点成分とを有する複合繊維であり、これら高融点成分と低融点成分とのいずれもがポリ乳酸にて形成されていることが好ましいとされ、芯部を融点１７０℃以上のポリ乳酸、鞘部を融点１３０℃程度のポリ乳酸とした芯鞘型の複合繊維が、熱融着加工のし易さ、接着力の高さの点から、好ましいとされている。なぜなら、ある程度融点差のあるポリ乳酸を組み合わせた芯鞘型の複合繊維を熱融着短繊維とすると、熱融着加工の際に芯部が溶融せず繊維形態を維持するため、熱融着短繊維がフィルム状に潰れるのを避けることができるからである。
特許文献４は、ポリ乳酸系重合体の長繊維及び極細繊維から構成された生分解性の積層不織布からなり、長繊維不織布を繊径１０〜２０μｍ、目付１０〜４０ｇ／ｍ２とし、極細繊維不織布を繊径１〜１０μｍ、目付１〜１０ｇ／ｍ２として、２種類の不織布が熱圧着により一体化された積層不織布を提案しており、このような積層不織布は、粉漏れ性、ヒートシール強度、透明性、機械的強度等に優れるとしている。
特許文献５は、低結晶性ポリ乳酸樹脂（Ａ）とポリブチレンサクシネート樹脂（Ｂ）とを、（Ａ）／（Ｂ）＝１０／９０〜９０／１０の重量割合で含有する生分解性樹脂組成物を提案しており、このような生分解性樹脂組成物は、生分解性のポリ乳酸樹脂を含有しながらも成型時に優れた加工性を示すとしている。
特許文献６は、結晶化度が９．０％以下で繊維径が１５．０μm以下のポリ乳酸系樹脂の繊維からなり目付が２．０〜３０．０g／m2であるメルトブロー不織布により形成された層と、結晶化度が３０．０〜６０．０％で繊維径が３５．０μm以下のポリ乳酸系樹脂の繊維からなり目付が５．０〜３０．０g／m2であるスパンボンド不織布により形成された層とを有する多層状の抽出用シートを提案しており、このような抽出用シートは、製造時の機械適性が高いとしている。 For example, polyethylene, polypropylene, polyester are used as non-woven fabrics that are often used for extraction bags such as tea bags, dashi bags, and decoction bags for raw medicine, or filters such as dust removal filters used for drains such as sinks. , Polyamide and other resins are used (for example, Patent Document 1).
Since these resins do not have autolysis and are extremely stable in the natural environment, biodegradable materials that have a small impact on the environment have been attracting attention in recent years.
Patent Document 2 is composed of a core-sheath type composite long fiber composed of polylactic acid and / or a thermoplastic polymer mainly composed of polylactic acid, and is a thermoplastic polymer mainly composed of polylactic acid and polylactic acid. Proposes a non-woven fabric having a melting point of 100 ° C. or higher and a lower melting point of the sheath component than the melting point of the core component. According to such a non-woven fabric, a deeply drawn molded product can be easily obtained and molded. It is said that the product can be provided with heat sealability and the molded product can be provided with biodegradability.
Patent Document 3 is made of biodegradable fiber, so that it can be finally returned to carbon dioxide and water by composting or landfilling after use, and can be heat-sealed when it is made into a bag, and it gets wet. We are proposing a biodegradable beverage filter bag containing binder fiber that maintains its strength even when it is used. The main short fibers having biodegradability are aliphatic polyester-based heat-fused short fibers having biodegradability, and the aliphatic polyester-based heat-fused short fibers have a high melting point component and this high melting point. It is a composite fiber having a low melting point component having a melting point of 20 ° C. or more lower than that of the component, and it is preferable that both the high melting point component and the low melting point component are formed of polylactic acid, and the core portion is formed. A core-sheath type composite fiber having a polylactic acid having a melting point of 170 ° C. or higher and a polylactic acid having a sheath having a melting point of about 130 ° C. is preferable from the viewpoint of ease of heat fusion processing and high adhesive strength. There is. This is because if a core-sheath type composite fiber in which polylactic acid having a certain melting point difference is used as a heat-sealed short fiber, the core portion does not melt during the heat-sealing process and the fiber morphology is maintained. This is because it is possible to prevent the short fibers from being crushed into a film.
Patent Document 4 comprises a biodegradable laminated non-woven fabric composed of long fibers and ultrafine fibers of a polylactic acid-based polymer, and the long fiber non-woven fabric has a fiber diameter of 10 to 20 μm and a grain size of 10 to 40 g / m 2. We have proposed a laminated non-woven fabric in which two types of non-woven fabrics are integrated by thermal pressure bonding, with a fiber diameter of 1 to 10 μm and a grain size of 1 to 10 g / m 2 , and such laminated non-woven fabrics are powder leakable and heat-sealed. It is said to be excellent in strength, transparency, mechanical strength, etc.
Patent Document 5 is a biodegradable substance containing a low crystalline polylactic acid resin (A) and a polybutylene succinate resin (B) in a weight ratio of (A) / (B) = 10/90 to 90/10. We have proposed a resin composition, and it is said that such a biodegradable resin composition exhibits excellent processability at the time of molding while containing a biodegradable polylactic acid resin.
Patent Document 6 is made of a polylactic acid resin fiber having a crystallinity of 9.0% or less and a fiber diameter of 15.0 μm or less, and is formed of a melt-blown non-woven fabric having a grain size of 2.0 to 30.0 g / m 2. A spunbonded non-woven fabric consisting of a layer and a polylactic acid resin fiber having a crystallinity of 30.0 to 60.0% and a fiber diameter of 35.0 μm or less and having a grain size of 5.0 to 30.0 g / m 2. We have proposed a multi-layered extraction sheet having a layer formed by, and it is said that such an extraction sheet has high mechanical suitability at the time of manufacture.

特許６３９３７９９号公報Japanese Patent No. 6393799 特開２０００−１３６４７８号公報Japanese Unexamined Patent Publication No. 2000-136478 特開２００２−１７７１４８号公報Japanese Unexamined Patent Publication No. 2002-177148 特開２０１１−１５７１１８号公報Japanese Unexamined Patent Publication No. 2011-157118 特開２００６−２３３２１７号公報JP-A-2006-233217 特開２０１６−１６８５６９号公報Japanese Unexamined Patent Publication No. 2016-168569

特許文献２から特許文献６に記載されるように、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布材を用いる場合には、ポリエチレン等の樹脂を用いた不織布と比較して、シール強度を含めて課題があり、融点や繊維長などの異なる複数繊維を複合させることでシール強度などの向上を図っている。
ところで、ポリエチレン等の樹脂を用いた不織布では、不織布材の製造工程におけるシール強度を向上する場合、不織布に加える温度、速度、押し圧力、及びキープ時間の４つを主なパラメータとし、これらのパラメータを調整することによって、目的とするシール強度を得ることが技術常識である。
特許文献１には、不織布シートに二重線の融着部を設け、融着部の間を切断することで飲食用抽出袋を形成することが開示されている。なお、特許文献１は、ポリエチレン等の樹脂を用いた従来の不織布であり、ポリ乳酸系樹脂の繊維からなるものではない。
特許文献１に記載されるように、ポリエチレン等の樹脂を用いた従来の不織布では、二重線の融着部としても、シール強度に影響を与えないことを図５及び図６に示す。
図５は実証試験に用いたお茶バッグの形状を示す図であり、図５（ａ）は特許文献１に記載のような二重線の融着部から切り離したお茶バッグの形状、図５（ｂ）は二重線ではなく１本の太い帯状の融着部から切り離したお茶バッグの形状である。
実証試験に用いた不織布は、ポリエステル／ポリエチレン複合繊維を基材としたエアースルー法による短繊維不織布である（品名Ｔ１８Ｊ−ＨＲ）。
この不織布は、目付の水準値が１８．０ｇ／ｍ２、厚さ０．７０ｍｍ、引張強度が横方向０．３０ｋｇｆ／２５ｍｍ以上、縦方向１．５０ｋｇｆ／２５ｍｍ以上である。
お茶バッグの製造における、不織布に加える温度、速度、押し圧力、及びキープ時間の４つのパラメータはいずれも同じとした。
図５（ａ）に示すお茶バッグは、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが２ｍｍ、寸法Ｉが２ｍｍ、寸法Ｊが４ｍｍ、寸法Ｋが１５ｍｍである。寸法Ｈ、寸法Ｉ、及び寸法Ｊが融着部である。
図５（ｂ）に示すお茶バッグは、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが４ｍｍ、寸法Ｉが１５ｍｍである。寸法Ｆ、寸法Ｇ、及び寸法Ｈが融着部である。
引張試験には、２枚の不織布シートだけが積層されて融着される箇所Ｚを切り取って行った。
引張試験測定器には、株式会社今田製作所製ＳＶ−５５Ｃ ２０Ｈを用いた。
図６は実証試験の結果を示す図であり、図６（ａ）は特許文献１に記載のような二重線の融着部から切り離したお茶バッグの引張強度、図６（ｂ）は二重線ではなく１本の太い帯状の融着部から切り離したお茶バッグの引張強度である。図６において縦軸は引張強度を示し、数値が大きくなるほど（上方）引張強度が高い。
図６に示すように、ポリエチレン等の樹脂を用いた不織布では、１本の太い帯状の融着部から切り離した場合と、二重線の融着部から切り離した場合とでは引張強度に違いは生じていない。
このように、ポリエチレン等の樹脂を用いた不織布では、二重線の融着部としてもシール強度に影響を与えない。
次に、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布を用いてお茶バッグを製造した際の実証実験について図７及び図８を用いて説明する。
図７（ａ）に示すように、お茶バッグの製造工程におけるヒートシール工程では、熱シール刃物１が外周面に配置された熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させる。
当接面４は熱シールローラ２の軸方向に形成している。従って、熱シール刃物１の当接面４が、第１不織布シート１０と第２不織布シート２０とを押圧及び加熱することで、第１不織布シート１０と第２不織布シート２０とが融着された帯状シール部３０が形成される（図７（ｂ））。
図７（ｂ）に示すように、帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成される。
そして、帯状シール部３０を切断することで、図７（ｃ）に示すように、帯状シール部３０の一部が残存した状態の第１不織布材５１と、帯状シール部３０の一部が残存した状態の第２不織布材５２に分離する。
ところで、図７（ｃ）に示す不織布材を、第１不織布材５１とすると、一方の帯状シール部３０Ｆは、熱シール刃物１の当接面４における、熱シールローラ２の回転方向前側部分によって形成され、他方の帯状シール部３０Ｂは、熱シール刃物１の当接面４における、熱シールローラ２の回転方向後側部分によって形成されている。
図８（ａ）は、熱シールローラ２の回転方向前側部分によって形成される一方の帯状シール部３０Ｆの引張強度を示し、図８（ｂ）は、熱シールローラ２の回転方向後側部分によって形成される他方の帯状シール部３０Ｂの引張強度を示している。
図８（ａ）に示す帯状シール部３０Ｆの引張強度が、図８（ｂ）に示す帯状シール部３０Ｂの引張強度よりも高くなっている。
本発明は、熱シールローラ２の回転方向前側部分によって形成される一方の帯状シール部３０Ｆの引張強度と、熱シールローラ２の回転方向後側部分によって形成される他方の帯状シール部３０Ｂの引張強度との相違に着目したものである。 As described in Patent Documents 2 to 6, when a non-woven fabric material made of biodegradable polylactic acid resin fibers is used, the sealing strength is higher than that of a non-woven fabric using a resin such as polyethylene. There are problems including the above, and we are trying to improve the sealing strength by combining multiple fibers with different melting points and fiber lengths.
By the way, in the case of a non-woven fabric using a resin such as polyethylene, when improving the sealing strength in the manufacturing process of the non-woven fabric material, four main parameters are the temperature, speed, pressing pressure, and keeping time applied to the non-woven fabric, and these parameters are used. It is a common technical knowledge to obtain the desired sealing strength by adjusting the above.
Patent Document 1 discloses that a non-woven fabric sheet is provided with a fused portion of a double wire, and a food and drink extraction bag is formed by cutting between the fused portions. Note that Patent Document 1 is a conventional non-woven fabric using a resin such as polyethylene, and is not made of polylactic acid-based resin fibers.
As described in Patent Document 1, it is shown in FIGS. 5 and 6 that a conventional non-woven fabric using a resin such as polyethylene does not affect the sealing strength even as a fused portion of double wires.
FIG. 5 is a diagram showing the shape of the tea bag used in the verification test, and FIG. 5 (a) shows the shape of the tea bag separated from the fused portion of the double line as described in Patent Document 1, FIG. 5 (a). b) is not a double line but a shape of a tea bag separated from one thick band-shaped fusion part.
The non-woven fabric used in the verification test is a short-fiber non-woven fabric using a polyester / polyethylene composite fiber as a base material by an air-through method (product name T18J-HR).
This non-woven fabric has a basis weight of 18.0 g / m 2 , a thickness of 0.70 mm, a tensile strength of 0.30 kgf / 25 mm or more in the horizontal direction, and 1.50 kgf / 25 mm or more in the vertical direction.
The four parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric in the production of the tea bag were all the same.
The tea bag shown in FIG. 5A has a dimension A of 95 mm, a dimension B of 70 mm, a dimension C of 31 mm, a dimension D of 13 mm, a dimension E of 84 mm, a dimension F of 3.5 mm, and a dimension G of 3.5 mm. The dimension H is 2 mm, the dimension I is 2 mm, the dimension J is 4 mm, and the dimension K is 15 mm. Dimension H, Dimension I, and Dimension J are fused portions.
The tea bag shown in FIG. 5B has a dimension A of 95 mm, a dimension B of 70 mm, a dimension C of 31 mm, a dimension D of 13 mm, a dimension E of 84 mm, a dimension F of 3.5 mm, and a dimension G of 3.5 mm. The dimension H is 4 mm and the dimension I is 15 mm. Dimension F, Dimension G, and Dimension H are fused portions.
In the tensile test, a portion Z where only two non-woven fabric sheets were laminated and fused was cut out.
As the tensile test measuring instrument, SV-55C 20H manufactured by Imada Seisakusho Co., Ltd. was used.
FIG. 6 is a diagram showing the results of the verification test, FIG. 6 (a) is the tensile strength of the tea bag separated from the fused portion of the double wire as described in Patent Document 1, and FIG. 6 (b) is the second. It is the tensile strength of the tea bag separated from one thick band-shaped fusion part instead of the heavy wire. In FIG. 6, the vertical axis indicates the tensile strength, and the larger the value, the higher the (upward) tensile strength.
As shown in FIG. 6, in the non-woven fabric using a resin such as polyethylene, there is a difference in tensile strength between the case where the non-woven fabric is separated from the one thick band-shaped fusion part and the case where the non-woven fabric is separated from the fusion part of the double wire. Not happening.
As described above, in the non-woven fabric using a resin such as polyethylene, the sealing strength is not affected even as the fused portion of the double wire.
Next, a demonstration experiment when a tea bag is manufactured using a non-woven fabric made of biodegradable polylactic acid resin fibers will be described with reference to FIGS. 7 and 8.
As shown in FIG. 7A, in the heat sealing step in the tea bag manufacturing process, the first non-woven fabric sheet is placed between the heat sealing roller 2 in which the heat sealing blade 1 is arranged on the outer peripheral surface and the receiving side roller 3. The 10 and the second non-woven fabric sheet 20 are passed in a stacked state.
The contact surface 4 is formed in the axial direction of the heat seal roller 2. Therefore, the contact surface 4 of the heat-sealing blade 1 presses and heats the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20, so that the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are fused. A strip-shaped seal portion 30 is formed (FIG. 7 (b)).
As shown in FIG. 7B, the first non-woven fabric material 51 is formed by the first non-woven fabric sheet piece 11F and the second non-woven fabric sheet piece 21F located on one side of the strip-shaped seal portion 30, and the other of the strip-shaped seal portions 30. The second non-woven fabric material 52 is formed by the other first non-woven fabric sheet piece 11B and the other second non-woven fabric sheet piece 21B located in.
Then, by cutting the strip-shaped seal portion 30, as shown in FIG. 7C, the first non-woven fabric material 51 in a state where a part of the strip-shaped seal portion 30 remains and a part of the strip-shaped seal portion 30 remain. It is separated into the second non-woven fabric material 52 in the state of being separated.
By the way, assuming that the non-woven material shown in FIG. 7C is the first non-woven material 51, one strip-shaped sealing portion 30F is formed by a front portion in the rotation direction of the heat-sealing roller 2 on the contact surface 4 of the heat-sealing blade 1. The other strip-shaped seal portion 30B is formed by a portion of the contact surface 4 of the heat seal blade 1 on the rear side in the rotation direction of the heat seal roller 2.
FIG. 8 (a) shows the tensile strength of one strip-shaped seal portion 30F formed by the front side portion in the rotation direction of the heat seal roller 2, and FIG. 8 (b) shows the tensile strength of one strip-shaped seal portion 30F formed by the rear portion in the rotation direction of the heat seal roller 2. It shows the tensile strength of the other strip-shaped seal portion 30B to be formed.
The tensile strength of the strip-shaped seal portion 30F shown in FIG. 8 (a) is higher than the tensile strength of the strip-shaped seal portion 30B shown in FIG. 8 (b).
In the present invention, the tensile strength of one strip-shaped seal portion 30F formed by the front side portion of the heat seal roller 2 in the rotation direction and the tension of the other strip-shaped seal portion 30B formed by the rear portion of the heat seal roller 2 in the rotation direction. It focuses on the difference from the strength.

本発明は、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上をヒートシール工程において行うことができる不織布材の製造方法、及び引張強度の高いポリ乳酸系樹脂の繊維からなる不織布材を提供することを目的とする。 In the present invention, the tensile strength at the fusion site of a non-woven fabric made of biodegradable polylactic acid resin fibers due to factors other than the four main parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric. It is an object of the present invention to provide a method for producing a nonwoven fabric material which can be improved in the heat sealing step, and to provide a nonwoven fabric material made of polylactic acid-based resin fibers having high tensile strength.

請求項１記載の本発明の不織布材の製造方法は、熱シールローラ２の軸方向に当接面４を形成する熱シール刃物１が前記熱シールローラ２の外周面に配置され、前記熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させ、前記熱シール刃物１の前記当接面４が、前記第１不織布シート１０と前記第２不織布シート２０とを押圧及び加熱することで、前記第１不織布シート１０と前記第２不織布シート２０とが融着された前記帯状シール部３０が形成され、前記帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、前記帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成され、前記帯状シール部３０を切断することで、前記帯状シール部３０の一部が残存した状態の前記第１不織布材５１と、前記帯状シール部３０の一部が残存した状態の前記第２不織布材５２に分離する不織布材の製造方法であって、前記第１不織布シート１０と前記第２不織布シート２０とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、前記熱シール刃物１の前記当接面４が、前記熱シールローラ２の前記軸方向に延び、互いを離間させた第１当接面４ｘと第２当接面４ｙとを有し、前記第１当接面４ｘによって第１帯状シール部３１が形成され、前記第２当接面４ｙによって第２帯状シール部３２が形成され、前記第１帯状シール部３１と前記第２帯状シール部３２との間には、帯状非シール部３３が形成され、前記第１帯状シール部３１と前記第２帯状シール部３２とによって前記帯状シール部３０が形成され、前記帯状非シール部３３を切断することで前記第１不織布材５１と前記第２不織布材５２とを形成し、前記第１帯状シール部３１が、前記第１不織布材５１に残存する前記帯状シール部３０となり、前記第２帯状シール部３２が、前記第２不織布材５２に残存する前記帯状シール部３０となり、前記帯状シール部における引張強度を１５ニュートン以上とすることを特徴とする。
請求項２記載の本発明の不織布材は、第１不織布シート片１１と第２不織布シート片２１との少なくとも一部が帯状シール部３０によって融着されている不織布材であって、前記第１不織布シート片１１と前記第２不織布シート片２１とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、前記帯状シール部３０の両側方には、前記第１不織布シート片１１と前記第２不織布シート片２１とが融着されていない帯状非シール部３３、３３ｚを有し、前記帯状シール部における引張強度を１５ニュートン以上とすることを特徴とする。 In the method for producing a non-woven material of the present invention according to claim 1, the heat-sealing blade 1 forming the contact surface 4 in the axial direction of the heat-sealing roller 2 is arranged on the outer peripheral surface of the heat-sealing roller 2, and the heat-sealing is performed. The first non-woven sheet 10 and the second non-woven sheet 20 are passed between the roller 2 and the receiving roller 3 in a superposed state, and the contact surface 4 of the heat-sealing blade 1 is the first non-woven sheet. By pressing and heating the 10 and the second non-woven sheet 20, the strip-shaped seal portion 30 in which the first non-woven sheet 10 and the second non-woven sheet 20 are fused is formed, and the strip-shaped seal portion 30 is formed. The first non-woven material 51 is formed by the one-sided first non-woven sheet sheet piece 11F and the other second non-woven sheet sheet piece 21F located on one side, and the other first non-woven sheet sheet piece 11B and the other first non-woven sheet piece 11B located on the other side of the strip-shaped sealing portion 30. The second non-woven material 52 is formed by the two non-woven sheet pieces 21B, and by cutting the strip-shaped seal portion 30, the first non-woven material 51 in a state where a part of the strip-shaped seal portion 30 remains and the strip-shaped seal. A method for producing a non-woven material that separates into the second non-woven material 52 in a state where a part of the portion 30 remains, wherein the first non-woven sheet 10 and the second non-woven sheet 20 are biodegradable polylactic acid. It is a non-woven fabric made of fibers of a system resin, and the contact surface 4 of the heat seal blade 1 extends in the axial direction of the heat seal roller 2 and is separated from each other by a first contact surface 4x and a second contact surface. It has a contact surface 4y, a first band-shaped seal portion 31 is formed by the first contact surface 4x, a second band-shaped seal portion 32 is formed by the second contact surface 4y, and the first band-shaped seal portion 32 is formed. A band-shaped non-seal portion 33 is formed between the 31 and the second band-shaped seal portion 32, and the band-shaped seal portion 30 is formed by the first band-shaped seal portion 31 and the second band-shaped seal portion 32. By cutting the strip-shaped non-seal portion 33, the first non-woven material 51 and the second non-woven material 52 are formed, and the first strip-shaped sealing portion 31 remains in the first non-woven material 51. part 30, and the second annular seal portion 32, and the second Ri Do and the annular seal portion 30 remaining on the nonwoven material 52, wherein to Rukoto and tensile strength of 15 Newtons or more in the annular seal portion ..
The non-woven fabric material of the present invention according to claim 2 is a non-woven fabric material in which at least a part of the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 is fused by a strip-shaped sealing portion 30, and the first non-woven fabric material. The non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 are a non-woven fabric made of fibers of a polylactic acid-based resin having biodegradability, and the first non-woven fabric sheet piece 11 is provided on both sides of the strip-shaped sealing portion 30. It has a belt-like non-sealing portion 33,33z not fused the second nonwoven sheet piece 21 transgressions, characterized by a tensile strength 15 Newtons or higher in the annular seal portion.

本発明によれば、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上をヒートシール工程において行うことができる。 According to the present invention, in a fused portion of a non-woven fabric made of biodegradable polylactic acid resin fibers due to factors other than the four main parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric. The tensile strength can be improved in the heat sealing process.

本発明の一実施例による不織布材の製造方法及び不織布材の製造方法に用いる装置を示す図The figure which shows the manufacturing method of the nonwoven fabric material by one Example of this invention, and the apparatus used for the manufacturing method of the nonwoven fabric material. 本実施例によって製造される不織布材を示す図The figure which shows the non-woven fabric material produced by this Example 本実施例の不織布材の引張強度の実証実験の結果を示す図The figure which shows the result of the demonstration experiment of the tensile strength of the non-woven fabric material of this Example. 比較例として製造された不織布材を示す図The figure which shows the non-woven fabric material manufactured as a comparative example. 実証試験に用いたお茶バッグの形状を示す図The figure which shows the shape of the tea bag used for the verification test 実証試験の結果を示す図Diagram showing the results of the verification test 生分解性を有するポリ乳酸系樹脂の繊維からなる不織布を用いてお茶バッグを製造した際の実証実験Demonstration experiment when manufacturing a tea bag using a non-woven fabric made of biodegradable polylactic acid resin fibers 熱シールローラの回転方向前側部分によって形成される一方の帯状シール部と、熱シールローラの回転方向後側部分によって形成される他方の帯状シール部との引張強度を示す図The figure which shows the tensile strength of one strip-shaped seal part formed by the front side part in the rotation direction of a heat seal roller, and the other strip-shaped seal part formed by the rear side part in a rotation direction of a heat seal roller.

本発明の第１の実施の形態による不織布材の製造方法は、第１不織布シートと第２不織布シートとが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、熱シール刃物の当接面が、熱シールローラの軸方向に延び、互いを離間させた第１当接面と第２当接面とを有し、第１当接面によって第１帯状シール部が形成され、第２当接面によって第２帯状シール部が形成され、第１帯状シール部と第２帯状シール部との間には、帯状非シール部が形成され、第１帯状シール部と第２帯状シール部とによって帯状シール部が形成され、帯状非シール部を切断することで第１不織布材と第２不織布材とを形成し、第１帯状シール部が、第１不織布材に残存する帯状シール部となり、第２帯状シール部が、第２不織布材に残存する帯状シール部となり、帯状シール部における引張強度を１５ニュートン以上とするものである。
本実施の形態によれば、第１当接面によって第１帯状シール部が形成され、第２当接面によって第２帯状シール部が形成され、第１帯状シール部と第２帯状シール部との間には、帯状非シール部が形成されることで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上を、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、ヒートシール工程において行うことができる。 The method for producing a non-woven material according to the first embodiment of the present invention is a non-woven fabric in which the first non-woven sheet and the second non-woven sheet are made of polylactic resin fibers having biodegradability, and is a heat-sealing blade. The contact surface extends in the axial direction of the thermal seal roller and has a first contact surface and a second contact surface separated from each other, and the first contact surface forms a first band-shaped seal portion. A second band-shaped seal portion is formed by the two contact surfaces, a band-shaped non-seal portion is formed between the first band-shaped seal portion and the second band-shaped seal portion, and the first band-shaped seal portion and the second band-shaped seal portion are formed. A strip-shaped seal portion is formed by the above, and the first non-woven material and the second non-woven material are formed by cutting the strip-shaped non-sealed portion, and the first strip-shaped seal portion becomes the strip-shaped seal portion remaining on the first non-woven material. second annular seal portion is Ri Do the annular seal portion remaining in the second nonwoven material, a tensile strength at annular seal portion which is to shall and 15 Newtons or more.
According to the present embodiment, the first band-shaped seal portion is formed by the first contact surface, the second band-shaped seal portion is formed by the second contact surface, and the first band-shaped seal portion and the second band-shaped seal portion are formed. By forming a band-shaped non-seal portion between them, the temperature, speed, and pressing of the non-woven fabric, which is made of biodegradable polylactic acid-based resin fibers, are applied to improve the tensile strength at the fused portion of the non-woven fabric. Factors other than the four main parameters of pressure and keep time can be used in the heat seal process.

本発明の第２の実施の形態による不織布材は、第１不織布シート片と第２不織布シート片とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、帯状シール部の両側方には、第１不織布シート片と第２不織布シート片とが融着されていない帯状非シール部を有し、帯状シール部における引張強度を１５ニュートン以上とするものである。
本実施の形態によれば、帯状シール部の両側方に帯状非シール部を有することで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。 The nonwoven fabric material according to the second embodiment of the present invention is a nonwoven fabric in which the first nonwoven fabric sheet piece and the second nonwoven fabric sheet piece are made of polylactic acid-based resin fibers having biodegradability, and both sides of the strip-shaped sealing portion. the one in which the first nonwoven sheet member and the second nonwoven sheet pieces have a strip non-sealing portions that are not fused, a tensile strength at annular seal portion is 15 Newtons or more.
According to the present embodiment, by having the strip-shaped non-sealing portions on both sides of the strip-shaped sealing portion, the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers is improved. Can be done.

以下本発明の一実施例による不織布材の製造方法について説明する。
図１は本実施例による不織布材の製造方法及び不織布材の製造方法に用いる装置を示す図である。
図１（ａ）及び図１（ｂ）に示すように、不織布材の製造工程におけるヒートシール工程では、熱シール刃物１が外周面に配置された熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させる。
第１不織布シート１０と第２不織布シート２０とは、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布である。
本実施例による第１不織布シート１０及び第２不織布シート２０は、融点が１６０℃〜１７０℃で一定条件下での生分解性を有する不織布である。
当接面４は熱シールローラ２の軸方向に形成している。受け側ローラ３の上流側にはギア５のバッククラッシュを防ぐ補助ローラ６を設けている。
図１（ｃ）及び図１（ｄ）に示すように、熱シール刃物１の当接面４は、熱シールローラ２の軸方向に延び、互いを離間させた第１当接面４ｘと第２当接面４ｙとを有している。
第１当接面４ｘは熱シールローラ２の回転方向前側角部４ｆを、第２当接面４ｙは熱シールローラ２の回転方向前側角部４ｆを有している。
熱シール刃物１の当接面４が、第１不織布シート１０と第２不織布シート２０とを押圧及び加熱することで、第１不織布シート１０と第２不織布シート２０とが融着された帯状シール部３０（図２参照）が形成される。 Hereinafter, a method for producing a nonwoven fabric material according to an embodiment of the present invention will be described.
FIG. 1 is a diagram showing a method for producing a nonwoven fabric material and an apparatus used for the method for producing a nonwoven fabric material according to this embodiment.
As shown in FIGS. 1 (a) and 1 (b), in the heat sealing step in the manufacturing process of the non-woven fabric material, the heat sealing blade 1 is placed between the heat sealing roller 2 arranged on the outer peripheral surface and the receiving roller 3. The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are passed through in a stacked state.
The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are non-woven fabrics made of biodegradable polylactic acid-based resin fibers.
The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 according to this embodiment are non-woven fabrics having a melting point of 160 ° C. to 170 ° C. and having biodegradability under certain conditions.
The contact surface 4 is formed in the axial direction of the heat seal roller 2. An auxiliary roller 6 for preventing backlash of the gear 5 is provided on the upstream side of the receiving roller 3.
As shown in FIGS. 1 (c) and 1 (d), the contact surface 4 of the heat-sealing blade 1 extends in the axial direction of the heat-sealing roller 2 and is separated from the first contact surface 4x. It has two contact surfaces 4y.
The first contact surface 4x has a front corner portion 4f in the rotation direction of the heat seal roller 2, and the second contact surface 4y has a front corner portion 4f in the rotation direction of the heat seal roller 2.
A strip-shaped seal in which the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are fused by the contact surface 4 of the heat-sealing blade 1 pressing and heating the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20. A portion 30 (see FIG. 2) is formed.

図２は本実施例によって製造される不織布材を示す図である。
図２（ａ）に示すように、帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成される。
帯状シール部３０は、第１帯状シール部３１と第２帯状シール部３２とによって形成される。第１帯状シール部３１は第１当接面４ｘによって形成され、第２帯状シール部３２は第２当接面４ｙによって形成される。
第１帯状シール部３１と第２帯状シール部３２との間には、帯状非シール部３３が形成される。
そして、帯状非シール部３３を切断することで、図２（ｂ）に示すように、帯状シール部３０の一部が残存した状態の第１不織布材５１と、帯状シール部３０の一部が残存した状態の第２不織布材５２に分離する。
第１不織布材５１に残存する一方の帯状シール部が第２帯状シール部３２となり、第１不織布材５１に残存する他方の帯状シール部が第１帯状シール部３１となる。
また、第２不織布材５２に残存する一方の帯状シール部が第１帯状シール部３１となり、第２不織布材５２に残存する他方の帯状シール部が第２帯状シール部３２となる。
図２（ｃ）は、本実施例の不織布材の形状及び寸法を示している。
本実施例による不織布材５１、５２では、１枚の不織布シートを折り畳むことで、第１不織布シート１０と第２不織布シート２０とを構成している。
図２（ｃ）に示すように、本実施例による不織布材５１、５２はお茶バッグであり、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが２ｍｍ、寸法Ｉが２ｍｍ、寸法Ｊが４ｍｍ、寸法Ｋが１５ｍｍである。寸法Ｈ、寸法Ｉ、及び寸法Ｊが融着部である。 FIG. 2 is a diagram showing a non-woven fabric material produced by this embodiment.
As shown in FIG. 2A, the first nonwoven fabric material 51 is formed by the first nonwoven fabric sheet piece 11F and the second nonwoven fabric sheet piece 21F located on one side of the strip-shaped sealing portion 30, and the other of the strip-shaped sealing portions 30. The second non-woven fabric material 52 is formed by the other first non-woven fabric sheet piece 11B and the other second non-woven fabric sheet piece 21B located in.
The strip-shaped seal portion 30 is formed by the first strip-shaped seal portion 31 and the second strip-shaped seal portion 32. The first band-shaped seal portion 31 is formed by the first contact surface 4x, and the second band-shaped seal portion 32 is formed by the second contact surface 4y.
A strip-shaped non-sealing portion 33 is formed between the first strip-shaped sealing portion 31 and the second strip-shaped sealing portion 32.
Then, by cutting the strip-shaped non-seal portion 33, as shown in FIG. 2B, the first non-woven fabric material 51 in a state where a part of the strip-shaped seal portion 30 remains and a part of the strip-shaped seal portion 30 are formed. It is separated into the second non-woven fabric material 52 in the remaining state.
One strip-shaped seal portion remaining on the first nonwoven fabric material 51 becomes the second strip-shaped seal portion 32, and the other strip-shaped seal portion remaining on the first nonwoven fabric material 51 becomes the first strip-shaped seal portion 31.
Further, one strip-shaped seal portion remaining on the second nonwoven fabric material 52 becomes the first strip-shaped seal portion 31, and the other strip-shaped seal portion remaining on the second nonwoven fabric material 52 becomes the second strip-shaped seal portion 32.
FIG. 2C shows the shape and dimensions of the nonwoven fabric material of this embodiment.
In the non-woven fabric materials 51 and 52 according to the present embodiment, the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are formed by folding one non-woven fabric sheet.
As shown in FIG. 2C, the non-woven fabric materials 51 and 52 according to the present embodiment are tea bags, and the dimensions A are 95 mm, the dimension B is 70 mm, the dimension C is 31 mm, the dimension D is 13 mm, and the dimension E is 84 mm. The dimension F is 3.5 mm, the dimension G is 3.5 mm, the dimension H is 2 mm, the dimension I is 2 mm, the dimension J is 4 mm, and the dimension K is 15 mm. Dimension H, Dimension I, and Dimension J are fused portions.

次に、本実施例の不織布材の製造方法によって製造した不織布材の引張強度の実証実験について図３及び図４を用いて説明する。
図３は本実施例の不織布材の引張強度の実証実験の結果を示す図であり、図３（ａ）は本実施例を示し、図３（ｂ）は比較例を示している。
本実施例及び比較例では、坪量が１８ｇ／ｍ２、厚さ０．０８ｍｍ、通気度２００〜４００ｃｃ／ｃｍ２／ｓｅｃ、引張強度が横方向２．０Ｎ／１５ｍｍ以上、縦方向９．５Ｎ／１５ｍｍ以上であるポリ乳酸系樹脂の繊維からなる不織布（ｓｕｓｔｉｃｏＫ４１２０６ＰＬＡ−Ｆ）を用いた。
なお、図４に示すように比較例は、帯状シール部３０が、１本の太い帯状の融着部で形成され、本実施例のように、第１帯状シール部３１及び第２帯状シール部３２としていない。不織布に加える温度、速度、押し圧力、及びキープ時間の４つのパラメータはいずれも同じ条件で製造した。
引張試験には、図５と同様に、２枚の不織布シートだけが積層されて融着される箇所Ｚを切り取って行った。引張試験測定器には、株式会社今田製作所製ＳＶ−５５Ｃ ２０Ｈを用いた。
図３（ａ）に示す本実施例の引張強度は、図３（ｂ）に示す比較例の引張強度よりも明らかに高くなっている。 Next, a demonstration experiment of the tensile strength of the nonwoven fabric material produced by the method for producing the nonwoven fabric material of this example will be described with reference to FIGS. 3 and 4.
FIG. 3 is a diagram showing the results of a demonstration experiment of the tensile strength of the nonwoven fabric material of this example, FIG. 3 (a) shows this example, and FIG. 3 (b) shows a comparative example.
In this example and comparative example, the basis weight is 18 g / m 2 , the thickness is 0.08 mm, the air permeability is 200 to 400 cc / cm 2 / sec, the tensile strength is 2.0 N / 15 mm or more in the horizontal direction, and 9.5 N in the vertical direction. A non-woven fabric (sustico K41206PLA-F) made of polylactic acid resin fibers having a size of / 15 mm or more was used.
In addition, as shown in FIG. 4, in the comparative example, the band-shaped seal portion 30 is formed by one thick band-shaped fused portion, and as in this embodiment, the first band-shaped seal portion 31 and the second band-shaped seal portion 31 Not set to 32. The four parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric were all manufactured under the same conditions.
In the tensile test, as in FIG. 5, a portion Z where only two non-woven fabric sheets were laminated and fused was cut out. As the tensile test measuring instrument, SV-55C 20H manufactured by Imada Seisakusho Co., Ltd. was used.
The tensile strength of this example shown in FIG. 3 (a) is clearly higher than that of the comparative example shown in FIG. 3 (b).

本実施例の不織布材５１、５２は、第１不織布シート片１１と第２不織布シート片２１とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、帯状シール部３１、３２の外側方には、第１不織布シート片１１と第２不織布シート片２１とが融着されていない帯状非シール部３３を有するものである。なお、帯状シール部３１、３２の内側方についても、帯状非シール部３３ｚを有している。
このように、帯状シール部３１、３２の両側方に帯状非シール部３３、３３ｚを有することで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。
特に、不織布材５１、５２に残存する帯状シール部３１、３２には、回転方向前側角部４ｆによって食い込み部が形成されることで、不織布の融着部での引張強度を向上させることができる。 The non-woven fabric materials 51 and 52 of this embodiment are non-woven fabrics in which the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 are made of polylactic acid-based resin fibers having biodegradability, and the strip-shaped sealing portions 31 and 32. On the outside, the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 have a band-shaped non-seal portion 33 in which the non-woven fabric sheet piece 21 is not fused. The band-shaped non-sealing portions 33z are also provided inside the strip-shaped sealing portions 31 and 32.
By having the band-shaped non-sealing portions 33 and 33z on both sides of the strip-shaped sealing portions 31 and 32 in this way, the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers is improved. Can be made to.
In particular, the strip-shaped seal portions 31 and 32 remaining on the non-woven fabric materials 51 and 52 are formed with a bite portion by the front corner portion 4f in the rotation direction, so that the tensile strength at the fused portion of the nonwoven fabric can be improved. ..

本実施例の不織布材の製造方法によれば、第１当接面４ｘによって第１帯状シール部３１が形成され、第２当接面４ｙによって第２帯状シール部３２が形成され、第１帯状シール部３１と第２帯状シール部３２との間には、帯状非シール部３３が形成されることで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上を、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、ヒートシール工程において行うことができる。
なお、図２（ａ）に示すように、第１帯状シール部３１と第２帯状シール部３２とは部分的にシール部によって連接されていてもよい。 According to the method for producing a non-woven fabric material of this embodiment, the first contact surface 4x forms the first band-shaped seal portion 31, and the second contact surface 4y forms the second band-shaped seal portion 32, so that the first band-shaped seal portion 32 is formed. By forming a strip-shaped non-sealing portion 33 between the sealing portion 31 and the second strip-shaped sealing portion 32, the tensile strength of the non-woven fabric made of biodegradable polylactic acid-based resin fibers at the fused portion. The improvement can be made in the heat sealing process by factors other than the four main parameters of temperature, speed, pressing pressure and keep time applied to the non-woven fabric.
As shown in FIG. 2A, the first strip-shaped seal portion 31 and the second strip-shaped seal portion 32 may be partially connected by the seal portion.

本発明による不織布材の製造方法によれば、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。 According to the method for producing a non-woven fabric material according to the present invention, it is possible to improve the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers.

１ 熱シール刃物
２ 熱シールローラ
３ 受け側ローラ
４ 当接面
４ｆ 回転方向前側角部
４ｘ 第１当接面
４ｙ 第２当接面
５ ギア
６ 補助ローラ
１０ 第１不織布シート
１１ 第１不織布シート片
１１Ｂ 他方第１不織布シート片
１１Ｆ 一方第１不織布シート片
２０ 第２不織布シート
２１ 第２不織布シート片
２１Ｂ 他方第２不織布シート片
２１Ｆ 一方第２不織布シート片
３０ 帯状シール部
３１ 第１帯状シール部
３２ 第２帯状シール部
３３、３３ｚ 帯状非シール部
５１ 第１不織布材
５２ 第２不織布材 1 Heat-sealing blade 2 Heat-sealing roller 3 Receiving side roller 4 Contact surface 4f Rotation direction front side corner 4x 1st contact surface 4y 2nd contact surface 5 Gear 6 Auxiliary roller 10 1st non-woven fabric sheet 11 1st non-woven fabric sheet piece 11B On the other hand, 1st non-woven fabric sheet piece 11F On the other hand, 1st non-woven fabric sheet piece 20 2nd non-woven fabric sheet 21 2nd non-woven fabric sheet piece 21B On the other hand, 2nd non-woven fabric sheet piece 21F On the other hand, 2nd non-woven fabric sheet piece 30 2nd band-shaped seal part 33, 33z Band-shaped non-seal part 51 1st non-woven fabric material 52 2nd non-woven fabric material

本発明は、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布材の製造方法及び不織布バッグに関する。 The present invention relates to a method for producing a nonwoven fabric material made of biodegradable polylactic acid resin fibers and a nonwoven fabric bag .

例えば、お茶バッグ、ダシバッグ、若しくは生薬の煎じバッグのような抽出用バッグ、又は流し台などの排水口に用いるゴミ取りフィルターのようなフィルターなどに多く使われている不織布には、ポリエチレン、ポリプロピレン、ポリエステル、ポリアミド等の樹脂が用いられている（例えば特許文献１）。
これらの樹脂は、自己分解性がなく、自然環境下で極めて安定であるため、近年では環境に与える負荷が小さい、生分解性素材が着目されている。
特許文献２は、ポリ乳酸及び／又はポリ乳酸を主体とする熱可塑性重合体よりなる２種成分の芯鞘型複合長繊維にて構成され、ポリ乳酸とポリ乳酸を主体とする熱可塑性重合体とは融点が１００℃以上であり、鞘成分の融点は芯成分の融点よりも低い不織布を提案しており、このような不織布によれば容易に深絞り成型品を得ることができ、しかも成型品にヒートシール性を具備させ、また成型品に生分解性を付与できるとしている。
特許文献３は、生分解性を有する繊維からなることで使用後のコンポスト処理や埋め立てにより最終的には炭酸ガスと水に戻ることができ、袋体にする時にヒートシールが可能であり、濡れた時でも強度を維持するようなバインダー繊維を含有した、生分解性の飲料用フィルターバッグを提案している。そして、生分解性を有する主体となる短繊維は、生分解性を有する脂肪族ポリエステル系熱融着短繊維であり、脂肪族ポリエステル系熱融着短繊維が、高融点成分と、この高融点成分よりも融点が２０℃以上低い低融点成分とを有する複合繊維であり、これら高融点成分と低融点成分とのいずれもがポリ乳酸にて形成されていることが好ましいとされ、芯部を融点１７０℃以上のポリ乳酸、鞘部を融点１３０℃程度のポリ乳酸とした芯鞘型の複合繊維が、熱融着加工のし易さ、接着力の高さの点から、好ましいとされている。なぜなら、ある程度融点差のあるポリ乳酸を組み合わせた芯鞘型の複合繊維を熱融着短繊維とすると、熱融着加工の際に芯部が溶融せず繊維形態を維持するため、熱融着短繊維がフィルム状に潰れるのを避けることができるからである。
特許文献４は、ポリ乳酸系重合体の長繊維及び極細繊維から構成された生分解性の積層不織布からなり、長繊維不織布を繊径１０〜２０μｍ、目付１０〜４０ｇ／ｍ２とし、極細繊維不織布を繊径１〜１０μｍ、目付１〜１０ｇ／ｍ２として、２種類の不織布が熱圧着により一体化された積層不織布を提案しており、このような積層不織布は、粉漏れ性、ヒートシール強度、透明性、機械的強度等に優れるとしている。
特許文献５は、低結晶性ポリ乳酸樹脂（Ａ）とポリブチレンサクシネート樹脂（Ｂ）とを、（Ａ）／（Ｂ）＝１０／９０〜９０／１０の重量割合で含有する生分解性樹脂組成物を提案しており、このような生分解性樹脂組成物は、生分解性のポリ乳酸樹脂を含有しながらも成型時に優れた加工性を示すとしている。
特許文献６は、結晶化度が９．０％以下で繊維径が１５．０μm以下のポリ乳酸系樹脂の繊維からなり目付が２．０〜３０．０g／m2であるメルトブロー不織布により形成された層と、結晶化度が３０．０〜６０．０％で繊維径が３５．０μm以下のポリ乳酸系樹脂の繊維からなり目付が５．０〜３０．０g／m2であるスパンボンド不織布により形成された層とを有する多層状の抽出用シートを提案しており、このような抽出用シートは、製造時の機械適性が高いとしている。 For example, polyethylene, polypropylene, polyester are used as non-woven fabrics that are often used for extraction bags such as tea bags, dashi bags, and decoction bags for raw medicine, or filters such as dust removal filters used for drains such as sinks. , Polyamide and other resins are used (for example, Patent Document 1).
Since these resins do not have autolysis and are extremely stable in the natural environment, biodegradable materials that have a small impact on the environment have been attracting attention in recent years.
Patent Document 2 is composed of a core-sheath type composite long fiber composed of polylactic acid and / or a thermoplastic polymer mainly composed of polylactic acid, and is a thermoplastic polymer mainly composed of polylactic acid and polylactic acid. Proposes a non-woven fabric having a melting point of 100 ° C. or higher and a lower melting point of the sheath component than the melting point of the core component. According to such a non-woven fabric, a deeply drawn molded product can be easily obtained and molded. It is said that the product can be provided with heat sealability and the molded product can be provided with biodegradability.
Patent Document 3 is made of biodegradable fiber, so that it can be finally returned to carbon dioxide and water by composting or landfilling after use, and can be heat-sealed when it is made into a bag, and it gets wet. We are proposing a biodegradable beverage filter bag containing binder fiber that maintains its strength even when it is used. The main short fibers having biodegradability are aliphatic polyester-based heat-fused short fibers having biodegradability, and the aliphatic polyester-based heat-fused short fibers have a high melting point component and this high melting point. It is a composite fiber having a low melting point component having a melting point of 20 ° C. or more lower than that of the component, and it is preferable that both the high melting point component and the low melting point component are formed of polylactic acid, and the core portion is formed. A core-sheath type composite fiber having a polylactic acid having a melting point of 170 ° C. or higher and a polylactic acid having a sheath having a melting point of about 130 ° C. is preferable from the viewpoint of ease of heat fusion processing and high adhesive strength. There is. This is because if a core-sheath type composite fiber in which polylactic acid having a certain melting point difference is used as a heat-sealed short fiber, the core portion does not melt during the heat-sealing process and the fiber morphology is maintained. This is because it is possible to prevent the short fibers from being crushed into a film.
Patent Document 4 comprises a biodegradable laminated non-woven fabric composed of long fibers and ultrafine fibers of a polylactic acid-based polymer, and the long fiber non-woven fabric has a fiber diameter of 10 to 20 μm and a grain size of 10 to 40 g / m 2. We have proposed a laminated non-woven fabric in which two types of non-woven fabrics are integrated by thermal pressure bonding, with a fiber diameter of 1 to 10 μm and a grain size of 1 to 10 g / m 2 , and such laminated non-woven fabrics are powder leakable and heat-sealed. It is said to be excellent in strength, transparency, mechanical strength, etc.
Patent Document 5 is a biodegradable substance containing a low crystalline polylactic acid resin (A) and a polybutylene succinate resin (B) in a weight ratio of (A) / (B) = 10/90 to 90/10. We have proposed a resin composition, and it is said that such a biodegradable resin composition exhibits excellent processability at the time of molding while containing a biodegradable polylactic acid resin.
Patent Document 6 is made of a polylactic acid resin fiber having a crystallinity of 9.0% or less and a fiber diameter of 15.0 μm or less, and is formed of a melt-blown non-woven fabric having a grain size of 2.0 to 30.0 g / m 2. A spunbonded non-woven fabric consisting of a layer and a polylactic acid resin fiber having a crystallinity of 30.0 to 60.0% and a fiber diameter of 35.0 μm or less and having a grain size of 5.0 to 30.0 g / m 2. We have proposed a multi-layered extraction sheet having a layer formed by, and it is said that such an extraction sheet has high mechanical suitability at the time of manufacture.

特許６３９３７９９号公報Japanese Patent No. 6393799 特開２０００−１３６４７８号公報Japanese Unexamined Patent Publication No. 2000-136478 特開２００２−１７７１４８号公報Japanese Unexamined Patent Publication No. 2002-177148 特開２０１１−１５７１１８号公報Japanese Unexamined Patent Publication No. 2011-157118 特開２００６−２３３２１７号公報JP-A-2006-233217 特開２０１６−１６８５６９号公報Japanese Unexamined Patent Publication No. 2016-168569

特許文献２から特許文献６に記載されるように、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布材を用いる場合には、ポリエチレン等の樹脂を用いた不織布と比較して、シール強度を含めて課題があり、融点や繊維長などの異なる複数繊維を複合させることでシール強度などの向上を図っている。
ところで、ポリエチレン等の樹脂を用いた不織布では、不織布材の製造工程におけるシール強度を向上する場合、不織布に加える温度、速度、押し圧力、及びキープ時間の４つを主なパラメータとし、これらのパラメータを調整することによって、目的とするシール強度を得ることが技術常識である。
特許文献１には、不織布シートに二重線の融着部を設け、融着部の間を切断することで飲食用抽出袋を形成することが開示されている。なお、特許文献１は、ポリエチレン等の樹脂を用いた従来の不織布であり、ポリ乳酸系樹脂の繊維からなるものではない。
特許文献１に記載されるように、ポリエチレン等の樹脂を用いた従来の不織布では、二重線の融着部としても、シール強度に影響を与えないことを図５及び図６に示す。
図５は実証試験に用いたお茶バッグの形状を示す図であり、図５（ａ）は特許文献１に記載のような二重線の融着部から切り離したお茶バッグの形状、図５（ｂ）は二重線ではなく１本の太い帯状の融着部から切り離したお茶バッグの形状である。
実証試験に用いた不織布は、ポリエステル／ポリエチレン複合繊維を基材としたエアースルー法による短繊維不織布である（品名Ｔ１８Ｊ−ＨＲ）。
この不織布は、目付の水準値が１８．０ｇ／ｍ２、厚さ０．７０ｍｍ、引張強度が横方向０．３０ｋｇｆ／２５ｍｍ以上、縦方向１．５０ｋｇｆ／２５ｍｍ以上である。
お茶バッグの製造における、不織布に加える温度、速度、押し圧力、及びキープ時間の４つのパラメータはいずれも同じとした。
図５（ａ）に示すお茶バッグは、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが２ｍｍ、寸法Ｉが２ｍｍ、寸法Ｊが４ｍｍ、寸法Ｋが１５ｍｍである。寸法Ｈ、寸法Ｉ、及び寸法Ｊが融着部である。
図５（ｂ）に示すお茶バッグは、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが４ｍｍ、寸法Ｉが１５ｍｍである。寸法Ｆ、寸法Ｇ、及び寸法Ｈが融着部である。
引張試験には、２枚の不織布シートだけが積層されて融着される箇所Ｚを切り取って行った。
引張試験測定器には、株式会社今田製作所製ＳＶ−５５Ｃ ２０Ｈを用いた。
図６は実証試験の結果を示す図であり、図６（ａ）は特許文献１に記載のような二重線の融着部から切り離したお茶バッグの引張強度、図６（ｂ）は二重線ではなく１本の太い帯状の融着部から切り離したお茶バッグの引張強度である。図６において縦軸は引張強度を示し、数値が大きくなるほど（上方）引張強度が高い。
図６に示すように、ポリエチレン等の樹脂を用いた不織布では、１本の太い帯状の融着部から切り離した場合と、二重線の融着部から切り離した場合とでは引張強度に違いは生じていない。
このように、ポリエチレン等の樹脂を用いた不織布では、二重線の融着部としてもシール強度に影響を与えない。
次に、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布を用いてお茶バッグを製造した際の実証実験について図７及び図８を用いて説明する。
図７（ａ）に示すように、お茶バッグの製造工程におけるヒートシール工程では、熱シール刃物１が外周面に配置された熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させる。
当接面４は熱シールローラ２の軸方向に形成している。従って、熱シール刃物１の当接面４が、第１不織布シート１０と第２不織布シート２０とを押圧及び加熱することで、第１不織布シート１０と第２不織布シート２０とが融着された帯状シール部３０が形成される（図７（ｂ））。
図７（ｂ）に示すように、帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成される。
そして、帯状シール部３０を切断することで、図７（ｃ）に示すように、帯状シール部３０の一部が残存した状態の第１不織布材５１と、帯状シール部３０の一部が残存した状態の第２不織布材５２に分離する。
ところで、図７（ｃ）に示す不織布材を、第１不織布材５１とすると、一方の帯状シール部３０Ｆは、熱シール刃物１の当接面４における、熱シールローラ２の回転方向前側部分によって形成され、他方の帯状シール部３０Ｂは、熱シール刃物１の当接面４における、熱シールローラ２の回転方向後側部分によって形成されている。
図８（ａ）は、熱シールローラ２の回転方向前側部分によって形成される一方の帯状シール部３０Ｆの引張強度を示し、図８（ｂ）は、熱シールローラ２の回転方向後側部分によって形成される他方の帯状シール部３０Ｂの引張強度を示している。
図８（ａ）に示す帯状シール部３０Ｆの引張強度が、図８（ｂ）に示す帯状シール部３０Ｂの引張強度よりも高くなっている。
本発明は、熱シールローラ２の回転方向前側部分によって形成される一方の帯状シール部３０Ｆの引張強度と、熱シールローラ２の回転方向後側部分によって形成される他方の帯状シール部３０Ｂの引張強度との相違に着目したものである。 As described in Patent Documents 2 to 6, when a non-woven fabric material made of biodegradable polylactic acid resin fibers is used, the sealing strength is higher than that of a non-woven fabric using a resin such as polyethylene. There are problems including the above, and we are trying to improve the sealing strength by combining multiple fibers with different melting points and fiber lengths.
By the way, in the case of a non-woven fabric using a resin such as polyethylene, when improving the sealing strength in the manufacturing process of the non-woven fabric material, four main parameters are the temperature, speed, pressing pressure, and keeping time applied to the non-woven fabric, and these parameters are used. It is a common technical knowledge to obtain the desired sealing strength by adjusting the above.
Patent Document 1 discloses that a non-woven fabric sheet is provided with a fused portion of a double wire, and a food and drink extraction bag is formed by cutting between the fused portions. Note that Patent Document 1 is a conventional non-woven fabric using a resin such as polyethylene, and is not made of polylactic acid-based resin fibers.
As described in Patent Document 1, it is shown in FIGS. 5 and 6 that a conventional non-woven fabric using a resin such as polyethylene does not affect the sealing strength even as a fused portion of double wires.
FIG. 5 is a diagram showing the shape of the tea bag used in the verification test, and FIG. 5 (a) shows the shape of the tea bag separated from the fused portion of the double line as described in Patent Document 1, FIG. 5 (a). b) is not a double line but a shape of a tea bag separated from one thick band-shaped fusion part.
The non-woven fabric used in the verification test is a short-fiber non-woven fabric using a polyester / polyethylene composite fiber as a base material by an air-through method (product name T18J-HR).
This non-woven fabric has a basis weight of 18.0 g / m 2 , a thickness of 0.70 mm, a tensile strength of 0.30 kgf / 25 mm or more in the horizontal direction, and 1.50 kgf / 25 mm or more in the vertical direction.
The four parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric in the production of the tea bag were all the same.
The tea bag shown in FIG. 5A has a dimension A of 95 mm, a dimension B of 70 mm, a dimension C of 31 mm, a dimension D of 13 mm, a dimension E of 84 mm, a dimension F of 3.5 mm, and a dimension G of 3.5 mm. The dimension H is 2 mm, the dimension I is 2 mm, the dimension J is 4 mm, and the dimension K is 15 mm. Dimension H, Dimension I, and Dimension J are fused portions.
The tea bag shown in FIG. 5B has a dimension A of 95 mm, a dimension B of 70 mm, a dimension C of 31 mm, a dimension D of 13 mm, a dimension E of 84 mm, a dimension F of 3.5 mm, and a dimension G of 3.5 mm. The dimension H is 4 mm and the dimension I is 15 mm. Dimension F, Dimension G, and Dimension H are fused portions.
In the tensile test, a portion Z where only two non-woven fabric sheets were laminated and fused was cut out.
As the tensile test measuring instrument, SV-55C 20H manufactured by Imada Seisakusho Co., Ltd. was used.
FIG. 6 is a diagram showing the results of the verification test, FIG. 6 (a) is the tensile strength of the tea bag separated from the fused portion of the double wire as described in Patent Document 1, and FIG. 6 (b) is the second. It is the tensile strength of the tea bag separated from one thick band-shaped fusion part instead of the heavy wire. In FIG. 6, the vertical axis indicates the tensile strength, and the larger the value, the higher the (upward) tensile strength.
As shown in FIG. 6, in the non-woven fabric using a resin such as polyethylene, there is a difference in tensile strength between the case where the non-woven fabric is separated from the one thick band-shaped fusion part and the case where the non-woven fabric is separated from the fusion part of the double wire. Not happening.
As described above, in the non-woven fabric using a resin such as polyethylene, the sealing strength is not affected even as the fused portion of the double wire.
Next, a demonstration experiment when a tea bag is manufactured using a non-woven fabric made of biodegradable polylactic acid resin fibers will be described with reference to FIGS. 7 and 8.
As shown in FIG. 7A, in the heat sealing step in the tea bag manufacturing process, the first non-woven fabric sheet is placed between the heat sealing roller 2 in which the heat sealing blade 1 is arranged on the outer peripheral surface and the receiving side roller 3. The 10 and the second non-woven fabric sheet 20 are passed in a stacked state.
The contact surface 4 is formed in the axial direction of the heat seal roller 2. Therefore, the contact surface 4 of the heat-sealing blade 1 presses and heats the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20, so that the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are fused. A strip-shaped seal portion 30 is formed (FIG. 7 (b)).
As shown in FIG. 7B, the first non-woven fabric material 51 is formed by the first non-woven fabric sheet piece 11F and the second non-woven fabric sheet piece 21F located on one side of the strip-shaped seal portion 30, and the other of the strip-shaped seal portions 30. The second non-woven fabric material 52 is formed by the other first non-woven fabric sheet piece 11B and the other second non-woven fabric sheet piece 21B located in.
Then, by cutting the strip-shaped seal portion 30, as shown in FIG. 7C, the first non-woven fabric material 51 in a state where a part of the strip-shaped seal portion 30 remains and a part of the strip-shaped seal portion 30 remain. It is separated into the second non-woven fabric material 52 in the state of being separated.
By the way, assuming that the non-woven material shown in FIG. 7C is the first non-woven material 51, one strip-shaped sealing portion 30F is formed by a front portion in the rotation direction of the heat-sealing roller 2 on the contact surface 4 of the heat-sealing blade 1. The other strip-shaped seal portion 30B is formed by a portion of the contact surface 4 of the heat seal blade 1 on the rear side in the rotation direction of the heat seal roller 2.
FIG. 8 (a) shows the tensile strength of one strip-shaped seal portion 30F formed by the front side portion in the rotation direction of the heat seal roller 2, and FIG. 8 (b) shows the tensile strength of one strip-shaped seal portion 30F formed by the rear portion in the rotation direction of the heat seal roller 2. It shows the tensile strength of the other strip-shaped seal portion 30B to be formed.
The tensile strength of the strip-shaped seal portion 30F shown in FIG. 8 (a) is higher than the tensile strength of the strip-shaped seal portion 30B shown in FIG. 8 (b).
In the present invention, the tensile strength of one strip-shaped seal portion 30F formed by the front side portion of the heat seal roller 2 in the rotation direction and the tension of the other strip-shaped seal portion 30B formed by the rear portion of the heat seal roller 2 in the rotation direction. It focuses on the difference from the strength.

本発明は、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上をヒートシール工程において行うことができる不織布材の製造方法、及び引張強度の高いポリ乳酸系樹脂の繊維からなる不織布バックを提供することを目的とする。 In the present invention, the tensile strength at the fusion site of a non-woven fabric made of biodegradable polylactic acid resin fibers due to factors other than the four main parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric. It is an object of the present invention to provide a method for producing a non-woven fabric material which can be improved in a heat-sealing step, and a non-woven fabric bag made of polylactic acid-based resin fibers having high tensile strength.

請求項１記載の本発明の不織布材の製造方法は、熱シールローラ２の軸方向に当接面４を形成する熱シール刃物１が前記熱シールローラ２の外周面に配置され、前記熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させ、前記熱シール刃物１の前記当接面４が、前記第１不織布シート１０と前記第２不織布シート２０とを押圧及び加熱することで、前記第１不織布シート１０と前記第２不織布シート２０とが融着された前記帯状シール部３０が形成され、前記帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、前記帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成され、前記帯状シール部３０を切断することで、前記帯状シール部３０の一部が残存した状態の前記第１不織布材５１と、前記帯状シール部３０の一部が残存した状態の前記第２不織布材５２に分離する不織布材の製造方法であって、前記第１不織布シート１０と前記第２不織布シート２０とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、前記熱シール刃物１の前記当接面４が、前記熱シールローラ２の前記軸方向に延び、互いを離間させた第１当接面４ｘと第２当接面４ｙとを有し、前記第１当接面４ｘによって第１帯状シール部３１が形成され、前記第２当接面４ｙによって第２帯状シール部３２が形成され、前記第１帯状シール部３１と前記第２帯状シール部３２との間には、帯状非シール部３３が形成され、前記第１帯状シール部３１と前記第２帯状シール部３２とによって前記帯状シール部３０が形成され、前記帯状非シール部３３を切断することで前記第１不織布材５１と前記第２不織布材５２とを形成し、前記第１帯状シール部３１が、前記第１不織布材５１に残存する前記帯状シール部３０となり、前記第２帯状シール部３２が、前記第２不織布材５２に残存する前記帯状シール部３０となり、不織布材５１、５２の融着部での引張強度が向上することを特徴とする。
請求項２記載の本発明の不織布バッグは、第１不織布シート片１１と第２不織布シート片２１との少なくとも一部が帯状シール部３０によって融着されている不織布バッグであって、前記第１不織布シート片１１と前記第２不織布シート片２１とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、両側部に前記帯状シール部３０を有し、前記帯状シール部３０の外側に、前記第１不織布シート片１１と前記第２不織布シート片２１とが融着されていない帯状非シール部３３、３３ｚを有し、不織布バッグの融着部での引張強度が向上することを特徴とする。 In the method for producing a non-woven material of the present invention according to claim 1, the heat-sealing blade 1 forming the contact surface 4 in the axial direction of the heat-sealing roller 2 is arranged on the outer peripheral surface of the heat-sealing roller 2, and the heat-sealing is performed. The first non-woven sheet 10 and the second non-woven sheet 20 are passed between the roller 2 and the receiving roller 3 in a superposed state, and the contact surface 4 of the heat-sealing blade 1 is the first non-woven sheet. By pressing and heating the 10 and the second non-woven sheet 20, the strip-shaped seal portion 30 in which the first non-woven sheet 10 and the second non-woven sheet 20 are fused is formed, and the strip-shaped seal portion 30 is formed. The first non-woven material 51 is formed by the one-sided first non-woven sheet sheet piece 11F and the other second non-woven sheet sheet piece 21F located on one side, and the other first non-woven sheet sheet piece 11B and the other first non-woven sheet piece 11B located on the other side of the strip-shaped sealing portion 30. The second non-woven material 52 is formed by the two non-woven sheet pieces 21B, and by cutting the strip-shaped seal portion 30, the first non-woven material 51 in a state where a part of the strip-shaped seal portion 30 remains and the strip-shaped seal. A method for producing a non-woven material that separates into the second non-woven material 52 in a state where a part of the portion 30 remains, wherein the first non-woven sheet 10 and the second non-woven sheet 20 are biodegradable polylactic acid. It is a non-woven fabric made of fibers of a system resin, and the contact surface 4 of the heat seal blade 1 extends in the axial direction of the heat seal roller 2 and is separated from each other by a first contact surface 4x and a second contact surface. It has a contact surface 4y, a first band-shaped seal portion 31 is formed by the first contact surface 4x, a second band-shaped seal portion 32 is formed by the second contact surface 4y, and the first band-shaped seal portion 32 is formed. A band-shaped non-seal portion 33 is formed between the 31 and the second band-shaped seal portion 32, and the band-shaped seal portion 30 is formed by the first band-shaped seal portion 31 and the second band-shaped seal portion 32. By cutting the strip-shaped non-seal portion 33, the first non-woven material 51 and the second non-woven material 52 are formed, and the first strip-shaped sealing portion 31 remains in the first non-woven material 51. part 30, and the second annular seal portion 32, the annular seal portion 30 becomes remaining in the second nonwoven material 52, and features that you increase the tensile strength at welded portion of the nonwoven material 51 and 52 To do.
The non-woven fabric bag of the present invention according to claim 2 is a non-woven fabric bag in which at least a part of a first non-woven fabric sheet piece 11 and a second non-woven fabric sheet piece 21 is fused by a strip-shaped sealing portion 30. The non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 are non-woven fabrics made of biodegradable polylactic acid-based resin fibers , have the strip-shaped sealing portions 30 on both sides , and are outside the strip-shaped sealing portion 30. In addition , the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 have strip-shaped non-seal portions 33 and 33z in which the non-woven fabric sheet piece 21 is not fused, so that the tensile strength at the fused portion of the non-woven fabric bag is improved. It is a feature.

本発明によれば、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上をヒートシール工程において行うことができる。 According to the present invention, in a fused portion of a non-woven fabric made of biodegradable polylactic acid resin fibers due to factors other than the four main parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric. The tensile strength can be improved in the heat sealing process.

本発明の一実施例による不織布材の製造方法及び不織布材の製造方法に用いる装置を示す図The figure which shows the manufacturing method of the nonwoven fabric material and the apparatus used for the manufacturing method of the nonwoven fabric material by one Example of this invention. 本実施例によって製造される不織布材を示す図The figure which shows the non-woven fabric material produced by this Example 本実施例の不織布材の引張強度の実証実験の結果を示す図The figure which shows the result of the demonstration experiment of the tensile strength of the non-woven fabric material of this Example. 比較例として製造された不織布材を示す図The figure which shows the non-woven fabric material manufactured as a comparative example. 実証試験に用いたお茶バッグの形状を示す図The figure which shows the shape of the tea bag used for the verification test 実証試験の結果を示す図Diagram showing the results of the verification test 生分解性を有するポリ乳酸系樹脂の繊維からなる不織布を用いてお茶バッグを製造した際の実証実験Demonstration experiment when manufacturing a tea bag using a non-woven fabric made of biodegradable polylactic acid resin fibers 熱シールローラの回転方向前側部分によって形成される一方の帯状シール部と、熱シールローラの回転方向後側部分によって形成される他方の帯状シール部との引張強度を示す図The figure which shows the tensile strength of one strip-shaped seal part formed by the front side part in the rotation direction of a heat seal roller, and the other strip-shaped seal part formed by the rear side part in a rotation direction of a heat seal roller.

本発明の第１の実施の形態による不織布材の製造方法は、第１不織布シートと第２不織布シートとが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、熱シール刃物の当接面が、熱シールローラの軸方向に延び、互いを離間させた第１当接面と第２当接面とを有し、第１当接面によって第１帯状シール部が形成され、第２当接面によって第２帯状シール部が形成され、第１帯状シール部と第２帯状シール部との間には、帯状非シール部が形成され、第１帯状シール部と第２帯状シール部とによって帯状シール部が形成され、帯状非シール部を切断することで第１不織布材と第２不織布材とを形成し、第１帯状シール部が、第１不織布材に残存する帯状シール部となり、第２帯状シール部が、第２不織布材に残存する帯状シール部となり、不織布材の融着部での引張強度が向上するものである。
本実施の形態によれば、第１当接面によって第１帯状シール部が形成され、第２当接面によって第２帯状シール部が形成され、第１帯状シール部と第２帯状シール部との間には、帯状非シール部が形成されることで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上を、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、ヒートシール工程において行うことができる。 The method for producing a non-woven fabric material according to the first embodiment of the present invention is a non-woven fabric in which the first non-woven fabric sheet and the second non-woven fabric sheet are made of polylactic acid-based resin fibers having biodegradability, and is a heat-sealing blade. The contact surface extends in the axial direction of the heat-sealing roller and has a first contact surface and a second contact surface separated from each other, and the first contact surface forms a first strip-shaped sealing portion. A second strip-shaped seal portion is formed by the two contact surfaces, a strip-shaped non-woven fabric portion is formed between the first strip-shaped seal portion and the second strip-shaped seal portion, and the first strip-shaped seal portion and the second strip-shaped seal portion are formed. A strip-shaped seal portion is formed by the above, and the first non-woven fabric material and the second non-woven fabric material are formed by cutting the strip-shaped non-seal portion, and the first non-woven fabric material becomes the strip-shaped seal portion remaining in the first non-woven fabric material. second annular seal portion becomes a band-like seal portion remaining in the second nonwoven material, is shall be improved tensile strength at welded portion of the nonwoven material.
According to the present embodiment, the first band-shaped seal portion is formed by the first contact surface, the second band-shaped seal portion is formed by the second contact surface, and the first band-shaped seal portion and the second band-shaped seal portion are formed. By forming a band-shaped non-seal portion between them, the temperature, speed, and pressing of the non-woven fabric, which is made of biodegradable polylactic acid-based resin fibers, are applied to improve the tensile strength at the fused portion of the non-woven fabric. Factors other than the four main parameters of pressure and keep time can be used in the heat seal process.

本発明の第２の実施の形態による不織布バッグは、第１不織布シート片と第２不織布シート片とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、両側部に帯状シール部を有し、帯状シール部の外側に、第１不織布シート片と第２不織布シート片とが融着されていない帯状非シール部を有し、不織布バッグの融着部での引張強度が向上するものである。
本実施の形態によれば、帯状シール部の両側方に帯状非シール部を有することで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布バッグの融着部での引張強度を向上させることができる。 The non-woven fabric bag according to the second embodiment of the present invention is a non-woven fabric in which the first non-woven fabric sheet piece and the second non-woven fabric sheet piece are made of polylactic acid-based resin fibers having biodegradability, and strip-shaped sealing portions are provided on both sides. has, on the outside of the annular seal portion, and a first nonwoven sheet member and the second nonwoven sheet piece has a strip non-sealing portion that has not been fused, to improve the tensile strength at welded portion of the nonwoven fabric bag It is a thing.
According to the present embodiment, by having the strip-shaped non-sealing portions on both sides of the strip-shaped sealing portion, the tensile strength at the fused portion of the non-woven fabric bag made of biodegradable polylactic acid resin fibers is improved. be able to.

以下本発明の一実施例による不織布材の製造方法について説明する。
図１は本実施例による不織布材の製造方法及び不織布材の製造方法に用いる装置を示す図である。
図１（ａ）及び図１（ｂ）に示すように、不織布材の製造工程におけるヒートシール工程では、熱シール刃物１が外周面に配置された熱シールローラ２と受け側ローラ３との間に、第１不織布シート１０と第２不織布シート２０とを重ねた状態で通過させる。
第１不織布シート１０と第２不織布シート２０とは、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布である。
本実施例による第１不織布シート１０及び第２不織布シート２０は、融点が１６０℃〜１７０℃で一定条件下での生分解性を有する不織布である。
当接面４は熱シールローラ２の軸方向に形成している。受け側ローラ３の上流側にはギア５のバッククラッシュを防ぐ補助ローラ６を設けている。
図１（ｃ）及び図１（ｄ）に示すように、熱シール刃物１の当接面４は、熱シールローラ２の軸方向に延び、互いを離間させた第１当接面４ｘと第２当接面４ｙとを有している。
第１当接面４ｘは熱シールローラ２の回転方向前側角部４ｆを、第２当接面４ｙは熱シールローラ２の回転方向前側角部４ｆを有している。
熱シール刃物１の当接面４が、第１不織布シート１０と第２不織布シート２０とを押圧及び加熱することで、第１不織布シート１０と第２不織布シート２０とが融着された帯状シール部３０（図２参照）が形成される。 Hereinafter, a method for producing a nonwoven fabric material according to an embodiment of the present invention will be described.
FIG. 1 is a diagram showing a method for producing a nonwoven fabric material and an apparatus used for the method for producing a nonwoven fabric material according to this embodiment.
As shown in FIGS. 1 (a) and 1 (b), in the heat sealing step in the manufacturing process of the non-woven fabric material, the heat sealing blade 1 is placed between the heat sealing roller 2 arranged on the outer peripheral surface and the receiving roller 3. The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are passed through in a stacked state.
The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are non-woven fabrics made of biodegradable polylactic acid-based resin fibers.
The first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 according to this embodiment are non-woven fabrics having a melting point of 160 ° C. to 170 ° C. and having biodegradability under certain conditions.
The contact surface 4 is formed in the axial direction of the heat seal roller 2. An auxiliary roller 6 for preventing backlash of the gear 5 is provided on the upstream side of the receiving roller 3.
As shown in FIGS. 1 (c) and 1 (d), the contact surface 4 of the heat-sealing blade 1 extends in the axial direction of the heat-sealing roller 2 and is separated from the first contact surface 4x. It has two contact surfaces 4y.
The first contact surface 4x has a front corner portion 4f in the rotation direction of the heat seal roller 2, and the second contact surface 4y has a front corner portion 4f in the rotation direction of the heat seal roller 2.
A strip-shaped seal in which the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are fused by the contact surface 4 of the heat-sealing blade 1 pressing and heating the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20. A portion 30 (see FIG. 2) is formed.

図２は本実施例によって製造される不織布材を示す図である。
図２（ａ）に示すように、帯状シール部３０の一方に位置する一方第１不織布シート片１１Ｆ及び一方第２不織布シート片２１Ｆによって第１不織布材５１が形成され、帯状シール部３０の他方に位置する他方第１不織布シート片１１Ｂ及び他方第２不織布シート片２１Ｂによって第２不織布材５２が形成される。
帯状シール部３０は、第１帯状シール部３１と第２帯状シール部３２とによって形成される。第１帯状シール部３１は第１当接面４ｘによって形成され、第２帯状シール部３２は第２当接面４ｙによって形成される。
第１帯状シール部３１と第２帯状シール部３２との間には、帯状非シール部３３が形成される。
そして、帯状非シール部３３を切断することで、図２（ｂ）に示すように、帯状シール部３０の一部が残存した状態の第１不織布材５１と、帯状シール部３０の一部が残存した状態の第２不織布材５２に分離する。
第１不織布材５１に残存する一方の帯状シール部が第２帯状シール部３２となり、第１不織布材５１に残存する他方の帯状シール部が第１帯状シール部３１となる。
また、第２不織布材５２に残存する一方の帯状シール部が第１帯状シール部３１となり、第２不織布材５２に残存する他方の帯状シール部が第２帯状シール部３２となる。
図２（ｃ）は、本実施例の不織布材の形状及び寸法を示している。
本実施例による不織布材５１、５２では、１枚の不織布シートを折り畳むことで、第１不織布シート１０と第２不織布シート２０とを構成している。
図２（ｃ）に示すように、本実施例による不織布材５１、５２はお茶バッグであり、寸法Ａが９５ｍｍ、寸法Ｂが７０ｍｍ、寸法Ｃが３１ｍｍ、寸法Ｄが１３ｍｍ、寸法Ｅが８４ｍｍ、寸法Ｆが３．５ｍｍ、寸法Ｇが３．５ｍｍ、寸法Ｈが２ｍｍ、寸法Ｉが２ｍｍ、寸法Ｊが４ｍｍ、寸法Ｋが１５ｍｍである。寸法Ｈ、寸法Ｉ、及び寸法Ｊが融着部である。 FIG. 2 is a diagram showing a non-woven fabric material produced by this embodiment.
As shown in FIG. 2A, the first nonwoven fabric material 51 is formed by the first nonwoven fabric sheet piece 11F and the second nonwoven fabric sheet piece 21F located on one side of the strip-shaped sealing portion 30, and the other of the strip-shaped sealing portions 30. The second non-woven fabric material 52 is formed by the other first non-woven fabric sheet piece 11B and the other second non-woven fabric sheet piece 21B located in.
The strip-shaped seal portion 30 is formed by the first strip-shaped seal portion 31 and the second strip-shaped seal portion 32. The first band-shaped seal portion 31 is formed by the first contact surface 4x, and the second band-shaped seal portion 32 is formed by the second contact surface 4y.
A strip-shaped non-sealing portion 33 is formed between the first strip-shaped sealing portion 31 and the second strip-shaped sealing portion 32.
Then, by cutting the strip-shaped non-seal portion 33, as shown in FIG. 2B, the first non-woven fabric material 51 in a state where a part of the strip-shaped seal portion 30 remains and a part of the strip-shaped seal portion 30 are formed. It is separated into the second non-woven fabric material 52 in the remaining state.
One strip-shaped seal portion remaining on the first nonwoven fabric material 51 becomes the second strip-shaped seal portion 32, and the other strip-shaped seal portion remaining on the first nonwoven fabric material 51 becomes the first strip-shaped seal portion 31.
Further, one strip-shaped seal portion remaining on the second nonwoven fabric material 52 becomes the first strip-shaped seal portion 31, and the other strip-shaped seal portion remaining on the second nonwoven fabric material 52 becomes the second strip-shaped seal portion 32.
FIG. 2C shows the shape and dimensions of the nonwoven fabric material of this embodiment.
In the non-woven fabric materials 51 and 52 according to the present embodiment, the first non-woven fabric sheet 10 and the second non-woven fabric sheet 20 are formed by folding one non-woven fabric sheet.
As shown in FIG. 2C, the non-woven fabric materials 51 and 52 according to the present embodiment are tea bags, and the dimensions A are 95 mm, the dimension B is 70 mm, the dimension C is 31 mm, the dimension D is 13 mm, and the dimension E is 84 mm. The dimension F is 3.5 mm, the dimension G is 3.5 mm, the dimension H is 2 mm, the dimension I is 2 mm, the dimension J is 4 mm, and the dimension K is 15 mm. Dimension H, Dimension I, and Dimension J are fused portions.

次に、本実施例の不織布材の製造方法によって製造した不織布材の引張強度の実証実験について図３及び図４を用いて説明する。
図３は本実施例の不織布材の引張強度の実証実験の結果を示す図であり、図３（ａ）は本実施例を示し、図３（ｂ）は比較例を示している。
本実施例及び比較例では、坪量が１８ｇ／ｍ２、厚さ０．０８ｍｍ、通気度２００〜４００ｃｃ／ｃｍ２／ｓｅｃ、引張強度が横方向２．０Ｎ／１５ｍｍ以上、縦方向９．５Ｎ／１５ｍｍ以上であるポリ乳酸系樹脂の繊維からなる不織布（ｓｕｓｔｉｃｏＫ４１２０６ＰＬＡ−Ｆ）を用いた。
なお、図４に示すように比較例は、帯状シール部３０が、１本の太い帯状の融着部で形成され、本実施例のように、第１帯状シール部３１及び第２帯状シール部３２としていない。不織布に加える温度、速度、押し圧力、及びキープ時間の４つのパラメータはいずれも同じ条件で製造した。
引張試験には、図５と同様に、２枚の不織布シートだけが積層されて融着される箇所Ｚを切り取って行った。引張試験測定器には、株式会社今田製作所製ＳＶ−５５Ｃ ２０Ｈを用いた。
図３（ａ）に示す本実施例の引張強度は、図３（ｂ）に示す比較例の引張強度よりも明らかに高くなっている。 Next, a demonstration experiment of the tensile strength of the nonwoven fabric material produced by the method for producing the nonwoven fabric material of this example will be described with reference to FIGS. 3 and 4.
FIG. 3 is a diagram showing the results of a demonstration experiment of the tensile strength of the nonwoven fabric material of this example, FIG. 3 (a) shows this example, and FIG. 3 (b) shows a comparative example.
In this example and comparative example, the basis weight is 18 g / m 2 , the thickness is 0.08 mm, the air permeability is 200 to 400 cc / cm 2 / sec, the tensile strength is 2.0 N / 15 mm or more in the horizontal direction, and 9.5 N in the vertical direction. A non-woven fabric (sustico K41206PLA-F) made of polylactic acid resin fibers having a size of / 15 mm or more was used.
In addition, as shown in FIG. 4, in the comparative example, the band-shaped seal portion 30 is formed by one thick band-shaped fused portion, and as in this embodiment, the first band-shaped seal portion 31 and the second band-shaped seal portion 31 Not set to 32. The four parameters of temperature, speed, pressing pressure, and keep time applied to the non-woven fabric were all manufactured under the same conditions.
In the tensile test, as in FIG. 5, a portion Z where only two non-woven fabric sheets were laminated and fused was cut out. As the tensile test measuring instrument, SV-55C 20H manufactured by Imada Seisakusho Co., Ltd. was used.
The tensile strength of this example shown in FIG. 3 (a) is clearly higher than that of the comparative example shown in FIG. 3 (b).

本実施例の不織布材５１、５２は、第１不織布シート片１１と第２不織布シート片２１とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、帯状シール部３１、３２の外側方には、第１不織布シート片１１と第２不織布シート片２１とが融着されていない帯状非シール部３３を有するものである。なお、帯状シール部３１、３２の内側方についても、帯状非シール部３３ｚを有している。
このように、帯状シール部３１、３２の両側方に帯状非シール部３３、３３ｚを有することで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。
特に、不織布材５１、５２に残存する帯状シール部３１、３２には、回転方向前側角部４ｆによって食い込み部が形成されることで、不織布の融着部での引張強度を向上させることができる。 The non-woven fabric materials 51 and 52 of this embodiment are non-woven fabrics in which the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 are made of polylactic acid-based resin fibers having biodegradability, and the strip-shaped sealing portions 31 and 32. On the outer side, the first non-woven fabric sheet piece 11 and the second non-woven fabric sheet piece 21 have a band-shaped non-seal portion 33 in which the non-woven fabric sheet piece 21 is not fused. The band-shaped non-sealing portions 33z are also provided inside the strip-shaped sealing portions 31 and 32.
By having the band-shaped non-sealing portions 33 and 33z on both sides of the strip-shaped sealing portions 31 and 32 in this way, the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers is improved. Can be made to.
In particular, the strip-shaped seal portions 31 and 32 remaining on the non-woven fabric materials 51 and 52 are formed with a bite portion by the front corner portion 4f in the rotation direction, so that the tensile strength at the fused portion of the nonwoven fabric can be improved. ..

本実施例の不織布材の製造方法によれば、第１当接面４ｘによって第１帯状シール部３１が形成され、第２当接面４ｙによって第２帯状シール部３２が形成され、第１帯状シール部３１と第２帯状シール部３２との間には、帯状非シール部３３が形成されることで、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度の向上を、不織布に加える温度、速度、押し圧力、及びキープ時間の４つの主なパラメータ以外の要因によって、ヒートシール工程において行うことができる。
なお、図２（ａ）に示すように、第１帯状シール部３１と第２帯状シール部３２とは部分的にシール部によって連接されていてもよい。 According to the method for producing a non-woven fabric material of this embodiment, the first contact surface 4x forms the first band-shaped seal portion 31, and the second contact surface 4y forms the second band-shaped seal portion 32, so that the first band-shaped seal portion 32 is formed. By forming a strip-shaped non-sealing portion 33 between the sealing portion 31 and the second strip-shaped sealing portion 32, the tensile strength of the non-woven fabric made of biodegradable polylactic acid-based resin fibers at the fused portion. The improvement can be made in the heat sealing process by factors other than the four main parameters of temperature, speed, pressing pressure and keep time applied to the non-woven fabric.
As shown in FIG. 2A, the first strip-shaped seal portion 31 and the second strip-shaped seal portion 32 may be partially connected by the seal portion.

本発明による不織布材の製造方法によれば、生分解性を有するポリ乳酸系樹脂の繊維からなる不織布の融着部での引張強度を向上させることができる。 According to the method for producing a non-woven fabric material according to the present invention, it is possible to improve the tensile strength at the fused portion of the non-woven fabric made of biodegradable polylactic acid resin fibers.

１ 熱シール刃物
２ 熱シールローラ
３ 受け側ローラ
４ 当接面
４ｆ 回転方向前側角部
４ｘ 第１当接面
４ｙ 第２当接面
５ ギア
６ 補助ローラ
１０ 第１不織布シート
１１ 第１不織布シート片
１１Ｂ 他方第１不織布シート片
１１Ｆ 一方第１不織布シート片
２０ 第２不織布シート
２１ 第２不織布シート片
２１Ｂ 他方第２不織布シート片
２１Ｆ 一方第２不織布シート片
３０ 帯状シール部
３１ 第１帯状シール部
３２ 第２帯状シール部
３３、３３ｚ 帯状非シール部
５１ 第１不織布材
５２ 第２不織布材 1 Heat-sealing blade 2 Heat-sealing roller 3 Receiving side roller 4 Contact surface 4f Rotation direction front side corner 4x 1st contact surface 4y 2nd contact surface 5 Gear 6 Auxiliary roller 10 1st non-woven fabric sheet 11 1st non-woven fabric sheet piece 11B On the other hand, 1st non-woven fabric sheet piece 11F On the other hand, 1st non-woven fabric sheet piece 20 2nd non-woven fabric sheet 21 2nd non-woven fabric sheet piece 21B On the other hand, 2nd non-woven fabric sheet piece 21F On the other hand, 2nd non-woven fabric sheet piece 30 2nd band-shaped seal part 33, 33z Band-shaped non-seal part 51 1st non-woven fabric material 52 2nd non-woven fabric material

Claims (2)

熱シールローラの軸方向に当接面を形成する熱シール刃物が前記熱シールローラの外周面に配置され、
前記熱シールローラと受け側ローラとの間に、第１不織布シートと第２不織布シートとを重ねた状態で通過させ、
前記熱シール刃物の前記当接面が、前記第１不織布シートと前記第２不織布シートとを押圧及び加熱することで、前記第１不織布シートと前記第２不織布シートとが融着された帯状シール部が形成され、
前記帯状シール部の一方に位置する一方第１不織布シート片及び一方第２不織布シート片によって第１不織布材が形成され、
前記帯状シール部の他方に位置する他方第１不織布シート片及び他方第２不織布シート片によって第２不織布材が形成され、
前記帯状シール部を切断することで、前記帯状シール部の一部が残存した状態の前記第１不織布材と、前記帯状シール部の一部が残存した状態の前記第２不織布材に分離する不織布材の製造方法であって、
前記第１不織布シートと前記第２不織布シートとが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、
前記熱シール刃物の前記当接面が、
前記熱シールローラの前記軸方向に延び、互いを離間させた第１当接面と第２当接面とを有し、
前記第１当接面によって第１帯状シール部が形成され、
前記第２当接面によって第２帯状シール部が形成され、
前記第１帯状シール部と前記第２帯状シール部との間には、帯状非シール部が形成され、
前記第１帯状シール部と前記第２帯状シール部とによって前記帯状シール部が形成され、
前記帯状非シール部を切断することで前記第１不織布材と前記第２不織布材とを形成し、
前記第１帯状シール部が、前記第１不織布材に残存する前記帯状シール部となり、
前記第２帯状シール部が、前記第２不織布材に残存する前記帯状シール部となる
ことを特徴とする不織布材の製造方法。 A heat-sealing blade that forms a contact surface in the axial direction of the heat-sealing roller is arranged on the outer peripheral surface of the heat-sealing roller.
The first non-woven fabric sheet and the second non-woven fabric sheet are passed between the heat seal roller and the receiving roller in a stacked state.
The contact surface of the heat-sealing blade presses and heats the first non-woven fabric sheet and the second non-woven fabric sheet, whereby the first non-woven fabric sheet and the second non-woven fabric sheet are fused to form a strip-shaped seal. Part is formed,
The first non-woven fabric material is formed by the one non-woven fabric sheet piece and the second non-woven fabric sheet piece located on one of the strip-shaped seal portions.
The second nonwoven fabric material is formed by the other first nonwoven fabric sheet piece and the other second nonwoven fabric sheet piece located on the other side of the strip-shaped sealing portion.
By cutting the strip-shaped seal portion, the nonwoven fabric is separated into the first non-woven fabric material in which a part of the strip-shaped seal portion remains and the second non-woven fabric material in which a part of the strip-shaped seal portion remains. It is a method of manufacturing materials
The first non-woven fabric sheet and the second non-woven fabric sheet are non-woven fabrics made of polylactic acid-based resin fibers having biodegradability.
The contact surface of the heat seal blade
It has a first contact surface and a second contact surface that extend in the axial direction of the heat seal roller and are separated from each other.
The first band-shaped seal portion is formed by the first contact surface, and the first band-shaped seal portion is formed.
A second band-shaped seal portion is formed by the second contact surface.
A band-shaped non-sealing portion is formed between the first band-shaped sealing portion and the second band-shaped sealing portion.
The band-shaped seal portion is formed by the first band-shaped seal portion and the second band-shaped seal portion.
By cutting the strip-shaped non-seal portion, the first non-woven fabric material and the second non-woven fabric material are formed.
The first strip-shaped seal portion becomes the strip-shaped seal portion remaining on the first non-woven fabric material.
A method for producing a nonwoven fabric material, wherein the second strip-shaped seal portion serves as the strip-shaped seal portion remaining on the second nonwoven fabric material. 第１不織布シート片と第２不織布シート片との少なくとも一部が帯状シール部によって融着されている不織布材であって、
前記第１不織布シート片と前記第２不織布シート片とが生分解性を有するポリ乳酸系樹脂の繊維からなる不織布であり、
前記帯状シール部の両側方には、前記第１不織布シート片と前記第２不織布シート片とが融着されていない帯状非シール部を有する
ことを特徴とする不織布材。 A non-woven fabric material in which at least a part of the first non-woven fabric sheet piece and the second non-woven fabric sheet piece is fused by a strip-shaped seal portion.
The first non-woven fabric sheet piece and the second non-woven fabric sheet piece are non-woven fabrics made of biodegradable polylactic acid resin fibers.
A non-woven fabric material characterized by having strip-shaped non-woven fabric portions on both sides of the strip-shaped sealing portion, wherein the first non-woven fabric sheet piece and the second non-woven fabric sheet piece are not fused.
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Citations (7)

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Publication number Priority date Publication date Assignee Title
JPH1143857A (en) * 1997-07-22 1999-02-16 Oji Paper Co Ltd Biodegradable non-woven fabric
JP2000152875A (en) * 1998-11-19 2000-06-06 Ishizu Seisakusho Co Ltd Filtering bag provided with hanging thread, manufacture thereof, and manufacturing device thereof
JP2002079593A (en) * 2000-09-06 2002-03-19 Epa Japan Kk Method and apparatus for manufacturing bag using biodegradable polymeric material
JP2005314864A (en) * 1999-06-18 2005-11-10 Toray Ind Inc Filament nonwoven fabric
JP2011157661A (en) * 2010-02-02 2011-08-18 Asahi Kasei Fibers Corp Biodegradable filament nonwoven fabric
JP2011157118A (en) * 2010-02-02 2011-08-18 Asahi Kasei Fibers Corp Filter for food made of biodegradable laminate nonwoven fabric
JP2016168569A (en) * 2015-03-13 2016-09-23 大紀商事株式会社 Sheet for extraction, filter for extraction, and bag for extraction

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1143857A (en) * 1997-07-22 1999-02-16 Oji Paper Co Ltd Biodegradable non-woven fabric
JP2000152875A (en) * 1998-11-19 2000-06-06 Ishizu Seisakusho Co Ltd Filtering bag provided with hanging thread, manufacture thereof, and manufacturing device thereof
JP2005314864A (en) * 1999-06-18 2005-11-10 Toray Ind Inc Filament nonwoven fabric
JP2002079593A (en) * 2000-09-06 2002-03-19 Epa Japan Kk Method and apparatus for manufacturing bag using biodegradable polymeric material
JP2011157661A (en) * 2010-02-02 2011-08-18 Asahi Kasei Fibers Corp Biodegradable filament nonwoven fabric
JP2011157118A (en) * 2010-02-02 2011-08-18 Asahi Kasei Fibers Corp Filter for food made of biodegradable laminate nonwoven fabric
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