JP4001794B2 - Method for producing high-rigidity nonwoven fabric, high-rigidity nonwoven fabric, and core material for tatami mat - Google Patents
Method for producing high-rigidity nonwoven fabric, high-rigidity nonwoven fabric, and core material for tatami mat Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
本発明は、不織布全体が均一な剛性に優れた高剛性不織布、それを使用した畳床に用いられる所の、見栄えの良い畳用芯材およびその高剛性不織布を簡易に製造することを可能にする製造法に関する。
【０００２】
【従来の技術】
最近、ポリエステル短繊維を原料として畳用芯材などを製造する試みが行われているが、例えば、これまでの畳用芯材は、ポリエステル短繊維のうち８０％がバインダー繊維を占め、バインダー繊維を大量に用いることによって、畳用芯材の剛性を可能な限り上げている。しかし、このような畳用芯材では、ユーザーの希望する剛性の置き畳用芯材としては、必ずしも満足するものでないのが現状である。そこでバインダー繊維を限りなく１００％とすることも製造上考えられなくもないが、製造上困難性があり、敢えて、畳用芯材の剛性をさらに増加させようとするには、密度を上げるしかない。しかし、これはコスト増加を伴ってしまう。
【０００３】
また、これまでの畳用芯材の製造における加熱処理は、熱風循環による加熱処理であるため、不織布表面と中心部では繊維同士の接着が不均一になってしまうという欠点があったため、畳用芯材の剛性不足の一因となっていた。
【０００４】
更には、これまでの畳用芯材は、片面、もしくは両面からニードルパンチを施すため、針打ちの跡が残るため見栄えが良くないといったこともある。
【０００５】
【発明が解決しようとする課題】
従って、本発明の課題とするところは、目付けが低いにもかかわらず不織布全体が均一な剛性に優れた高剛性不織布、それを用いた畳床に用いられる所の、見栄えの良い畳用芯材、およびその高剛性不織布を簡易に製造することを可能にする製造法を提供するにある。
【０００６】
【課題を解決するための手段】
上述の課題は、ポリエステル系不織布に、不織布目付け重量（ｇ／ｍ ２ ）に対し、１ｍ ２ あたり５〜２０重量％の水を付与する水処理工程および１２０〜２２０℃の加熱処理工程を施すことにより、目付けが３００〜１,５００ｇ／ｍ２で、且つその曲げ強度がＪＩＳ Ｋ７２２１曲げ試験に準拠して行ったとき１．０〜３．０ｋｇｆとなした、高剛性不織布の製造方法（請求項１）によって達成される。
【０００７】
また、前記ポリエステル系不織布が、密度０．０１〜０．３ｇ／ｃｍ３である請求項１記載の高剛性不織布の製造方法（請求項２）、前記ポリエステル系不織布が、熱融着繊維を５０重量％以上、中空繊維を１０重量％以上含む請求項１または請求項２記載の高剛性不織布の製造方法（請求項３）、前記中空繊維がサイド・バイ・サイド型の捲縮繊維である請求項３記載の高剛性不織布の製造方法（請求項４）、前記熱融着繊維が、芯鞘構造の複合繊維で、鞘部の融点が芯部に比して低融点成分からなるものである請求項３記載の高剛性不織布の製造方法（請求項５）によって達成され、
【０００８】
また、請求項１〜請求項５いずれかに記載の高剛性不織布の製造方法から製造された高剛性不織布（請求項６）、前記高剛性不織布からなる畳用芯材（請求項７）によって達成され、
【０００９】
更には、前記畳用芯材が、厚さ５〜６０ｍｍである請求項７記載の畳用芯材（請求項８）によって達成される。
【００１０】
本発明により、これまでの製造工程を大きく変更することなく、これまでの畳用芯材と同程度のコストで、これまでにない高剛性の不織布が得られ、また、それを用いた畳用芯材が得られ、置き畳床としての活用が可能となる。また、高剛性不織布の製造において、水処理工程および加熱工程を製造工程中に取り入れることによって、例えば、シャワーリング（水噴霧）の水が蒸気となってスチームセット処理と同様な効果が得られるため、不織布表面と中心部の繊維の接着が均一となり、剛性が著しく上昇するといった著しい作用効果が生じる。更には、水噴霧後の加熱処理により表面が収縮し、ニーパン跡が低減して見栄えが著しく良くなる。
【００１１】
【発明の実施の形態】
以下、本発明の構成の詳細について説明する。
【００１２】
かかる本発明で使用する不織布としては、一般に、ポリエステル系繊維を使用した短繊維不織布であればよいが、熱融着繊維を５０重量％以上、中空繊維を１０重量％以上含むものであるのが好ましく、特に、熱融着繊維を６０重量％以上、中空繊維を１５重量％以上含むものであるのがよい。この場合、不織布は熱融着繊維と中空繊維のみからなるものであっても、また、これらに通常のレギュラー（中実）繊維を併用したものであってもよい。
【００１３】
熱融着繊維は、不織布の硬度を高めるのに有効であり、また中空繊維は、不織布の軽量化及びクッション性等を高めるのに有効である。熱融着繊維としては、芯鞘構造の複合繊維で、鞘部の融点が芯部に比して低融点成分からなるものを使用するのが好ましく、また、中空繊維としてはサイド・バイ・サイド型のもので、いわゆる捲縮繊維となるものを使用するのが好ましい。
【００１４】
本発明に用いられるポリエステル系不織布の密度としては、０．０１〜０．３ｇ／ｃｍ3が好ましい。
【００１５】
本発明の高剛性不織布の厚さは、用途に応じ適宜、選択されるが、例えば、本発明の畳用芯材の厚さの場合は、通常５〜６０ｍｍが好ましく、例えば５〜２０ｍｍの厚さのものを複数枚積層して使用してもよい。
【００１６】
本発明の高剛性不織布の目付けは、３００〜１５００ｇ／ｍ2 であることが必要である。３００ｇ／ｍ2未満であると畳芯材等の用途としては必要な剛性が得られない。また、１５００ｇ／ｍ2を超えるとコストアップの要因にもなる。
【００１７】
本発明の高剛性不織布の剛性としては、その曲げ強度がＪＩＳ Ｋ７２２１曲げ試験に準拠して行ったとき１．０〜３．０ｋｇｆであることが必要である。１．０ｋｇｆ未満であると剛性不足となり、例えば、畳芯材等に必要なクッション性が得られない点で好ましくなく、３．０ｋｇｆを超えると逆に剛性が高くなりすぎ、畳芯材等としての縫製、切断が困難になるという作業性の点で好ましくない。
【００１８】
本発明の高剛性不織布の用途としては、本発明の畳用芯材以外に、建材用途として、具体的には、フローリング芯材、壁用芯材等、ベニア板の代替品などが挙げられる。
【００１９】
本発明の畳用芯材には、かかるポリエステル系不織布のみからなるものであってもよいが、木質系インシュレーションボード、わら及び炭化コルクからなる群から選ばれる少なくとも一種と共に、芯材に用いられても良い。
【００２０】
また、木質系インシュレーションボード、わら及び炭化コルクからなる群から選ばれる少なくとも一種を併用する場合には、これらを、ポリエステル系不織布の片面に積層しても、両面に積層してもよいが、通常、ポリエステル系不織布の表裏両面に積層するのが好ましく、その厚さは、わら等の合計厚さが、ポリエステル系不織布の厚さに対して１：２〜２：１、特に３：４〜４：３程度の割合であるのが好ましい。
【００２１】
本発明の畳用芯材が用いられる畳は、前記、特性を有する畳用芯材からなることが好ましい。該畳は、通常用いられている所の畳表で覆い、縫着糸で畳床と縫着される。畳表の間には、不織布のシートなど挟み、クッション性などを持たせる。
【００２２】
本発明の高剛性不織布の製法としては、通常の不織布製造後得られたポリエステル系不織布を、更に水処理工程および１２０〜２２０℃の加熱処理工程を施して製造される。
【００２３】
本発明の高剛性不織布の製法で用いられる水処理工程としては、水噴霧工程、浸漬工程などが好ましい方法として挙げられ、水噴霧工程が、適宜、必要量の水を簡便に制御処理できる点で特に好ましい。
水処理量は、装置環境により適宜適用されるが、不織布目付け重量（ｇ／ｍ ２ ）に対し、１ｍ ２ あたり５〜２０重量％である。５重量％未満であるとスチームセットの効果が得られにくく、２０重量％を超えると加熱処理工程ですべての水分を蒸気に変えることができずに不織布中に水分として残留してしまうことが生じる。
尚、高剛性不織布の目付けが相当重いところでは、水処理工程による際だった剛性効果は期待されない。
【００２４】
【実施例】
本発明を具体的に説明するのに先立ち、曲げ強度の試験方法を記載する。
（曲げ強度試験）
実施例１、実施例２および比較例１の各資料のサンプルサイズを５ｃｍ×１５ｃｍ×６ｍｍとし、曲げ強度試験は、ＪＩＳ Ｋ７２２１ 硬質発泡プラスチック曲げ試験に準拠して行う。測定条件は、室温で、ヘッドスピードは２０ｍｍ／ｍｉｎとした。サンプル数はｎ＝３で行い、その平均値および標準偏差値を算出した。その曲げ強度の平均値が、１．０〜３．０ｋｇｆを良とした。
【００２５】
次に、実施例および比較例に基づいて本発明を具体的に説明する。尚、本発明はこれらの実施例のみに限定されるものではない。
【００２６】
実施例１
カネボウ合繊（株）製のポリエチレンテレフタレート（ＰＥＴ）短繊維Ｈ５８８（１４ｄｔｅｘ×５１ｍｍ）を２０重量％と、熱融着繊維としてのユニチカファイバー（株）製の共重合ＰＥＴ短繊維４０８０（２．２ｄｔｅｘ×５１ｍｍ）８０重量％を開繊、混綿し、カード機、クロスレイヤー処理を行った後、ニードルパンチを施した。引続き、試料の片面から水を１００ｇ／ｍ2の一定量（不織布目付け重量の１０重量％）で噴霧した後、両側面から１８０℃の加熱処理を施し、目付１０００ｇ／ｍ2 、厚さ１０ｍｍ、密度０．１０ｇ／ｃｍ3 の短繊維不織布（高剛性不織布）を得た。これを９１０ｍｍ×１８２０ｍｍにカットし、表１のような優れた高剛性の畳用芯材を得た。
この高剛性畳用芯材の表裏両面にわらを重ね、表面に畳表で覆い、通常の本畳製造法に順じて、畳を製造した。
【００２７】
比較例１
カネボウ合繊（株）製のポリエチレンテレフタレート（ＰＥＴ）短繊維Ｈ５８８（１４ｄｔｅｘ×５１ｍｍ）を２０重量％と、熱融着繊維としてのユニチカファイバー（株）製の共重合ＰＥＴ短繊維４０８０（２．２ｄｔｅｘ×５１ｍｍ）８０重量％を開繊、混綿し、カード機、クロスレイヤー処理を行った後、ニードルパンチを施して、目付１０００ｇ／ｍ2 、厚さ１０ｍｍ、密度０．１０ｇ／ｃｍ3 の短繊維不織布（畳用芯材）を得た。表１の結果に示したように柔らかで、曲げ強度がほとんど無く、実用に供し得ないものであった。
【００２８】
実施例２
カネボウ合繊（株）製のポリエチレンテレフタレート（ＰＥＴ）短繊維Ｈ５８８（１４ｄｔｅｘ×５１ｍｍ）を２０重量％と、熱融着繊維としてのユニチカファイバー（株）製の共重合ＰＥＴ短繊維４０８０（２．２ｄｔｅｘ×５１ｍｍ）８０重量％を開繊、混綿し、カード機、クロスレイヤー処理を行った後、ニードルパンチを施した。引続き、試料の片面から水を７０ｇ／ｍ2の一定量（不織布目付け重量の１４重量％）で噴霧した後、両側面から１８０℃の加熱処理を施し、目付５００ｇ／ｍ2 、厚さ７ｍｍ、密度０．０７ｇ／ｃｍ3 の短繊維不織布を得た。これを９１５ｍｍ×６１０ｍｍにカットして表１のような優れた高剛性不織布を得た。この高剛性不織布を化粧板と積層し、フローリング芯材として使用した。
【００２９】
【表１】
【発明の効果】
如上の通り、本発明により、不織布全体が均一な剛性に優れた高剛性不織布、それを使用した畳床に用いられる所の、見栄えの良い畳用芯材およびその高剛性不織布を簡易に製造することを可能にする製造法が提供できる。[0001]
BACKGROUND OF THE INVENTION
The present invention makes it possible to easily produce a high-rigidity nonwoven fabric having excellent uniform rigidity throughout the nonwoven fabric, a tatami mat core material that is used for a tatami floor using the nonwoven fabric, and its high-rigidity nonwoven fabric. It relates to a manufacturing method.
[0002]
[Prior art]
Recently, attempts have been made to produce a tatami core material using polyester short fibers as a raw material. For example, 80% of polyester short fibers in the past have been used as binder fibers. As a result, the rigidity of the tatami mat core is increased as much as possible. However, in such a tatami core material, the present situation is that the tatami mat core material having the rigidity desired by the user is not always satisfactory. Therefore, there is no limit to making the binder fiber 100% as much as possible, but there is difficulty in manufacturing, and the only way to increase the rigidity of the tatami core is to increase the density. Absent. However, this is accompanied by an increase in cost.
[0003]
In addition, since the heat treatment in the production of the core material for tatami mats so far is a heat treatment by circulating hot air, there is a disadvantage that the bonding between the fibers becomes non-uniform at the nonwoven fabric surface and the central portion. This was a cause of insufficient rigidity of the core material.
[0004]
Furthermore, since the core material for tatami mats so far is subjected to needle punching from one side or both sides, there are cases where the appearance of the needle is not good because traces of the needle strike remain.
[0005]
[Problems to be solved by the invention]
Therefore, the subject of the present invention is a high-rigidity nonwoven fabric with excellent uniform rigidity throughout the nonwoven fabric despite its low basis weight, and a good-looking tatami core material used for a tatami floor using the nonwoven fabric. And a manufacturing method that makes it possible to easily manufacture the highly rigid nonwoven fabric.
[0006]
[Means for Solving the Problems]
The problems described above is a polyester nonwoven fabric, relative to the nonwoven fabric mass per unit area weight (g / m 2), it is subjected to water treatment step and 120 to 220 ° C. heating process imparts 1 m 2 per 5 to 20 wt% of water by having a basis weight in 300~1,500g / m 2, and its bending strength is no and 1.0~3.0kgf when carried out in accordance with JIS K7221 bending test, the method of manufacturing a high rigidity nonwoven (claim Achieved by 1).
[0007]
The polyester-based nonwoven fabric has a density of 0.01 to 0.3 g / cm 3. The method for producing a high-rigidity nonwoven fabric according to claim 1 (claim 2), wherein the polyester-based nonwoven fabric has 50 heat-bonding fibers. The method for producing a highly rigid nonwoven fabric (Claim 3) according to claim 1 or 2 , wherein the hollow fiber is a side-by-side crimped fiber. The method for producing a highly rigid nonwoven fabric according to Item 3 (Claim 4), wherein the heat-fusible fiber is a composite fiber having a core-sheath structure, and the melting point of the sheath part is composed of a low-melting-point component as compared with the core part. is achieved by a method for manufacturing a high rigidity nonwoven according to claim 3, wherein (claim 5),
[0008]
Moreover, the high-rigidity nonwoven fabric manufactured from the manufacturing method of the highly rigid nonwoven fabric in any one of Claims 1-5 (Claim 6), and the core material for tatami mats (Claim 7) which consists of the said high-rigidity nonwoven fabric. And
[0009]
Furthermore, the core material for tatami mat is achieved by the core material for tatami mat (claim 8) having a thickness of 5 to 60 mm.
[0010]
According to the present invention, an unprecedented high-rigidity nonwoven fabric can be obtained at a cost comparable to that of a conventional tatami core material without greatly changing the conventional manufacturing process, and for tatami mats using the same. A core material can be obtained and used as a tatami floor. Further, in the production of a highly rigid nonwoven fabric, by incorporating the water treatment step and the heating step into the production step, for example, the water in the shower ring (water spray) becomes steam and the same effect as the steam set treatment is obtained. As a result, the non-woven fabric surface and the fibers at the center are evenly bonded and the rigidity is remarkably increased. Furthermore, the surface shrinks due to the heat treatment after spraying with water, the knee pan marks are reduced, and the appearance is remarkably improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Details of the configuration of the present invention will be described below.
[0012]
In general, the nonwoven fabric used in the present invention may be a short fiber nonwoven fabric using polyester fibers, but preferably contains 50% by weight or more of heat-sealing fibers and 10% by weight or more of hollow fibers, In particular, it is preferable that the heat-sealing fiber contains 60% by weight or more and the hollow fiber contains 15% by weight or more. In this case, the non-woven fabric may be composed only of heat-sealing fibers and hollow fibers, or may be a combination of ordinary regular (solid) fibers.
[0013]
The heat-fusible fiber is effective for increasing the hardness of the nonwoven fabric, and the hollow fiber is effective for reducing the weight of the nonwoven fabric and improving the cushioning property. As the heat-fusible fiber, it is preferable to use a composite fiber having a core-sheath structure in which the melting point of the sheath part is composed of a component having a low melting point as compared with the core part. It is preferable to use a mold which is a so-called crimped fiber.
[0014]
The density of the polyester nonwoven fabric used in the present invention is preferably 0.01 to 0.3 g / cm 3 .
[0015]
Although the thickness of the highly rigid nonwoven fabric of this invention is suitably selected according to a use, for example, in the case of the thickness of the core material for tatami of this invention, 5-60 mm is preferable normally, for example, thickness of 5-20 mm A plurality of the above may be laminated and used.
[0016]
Rigid nonwoven basis weight of the present invention is required to be 300 to 1500 g / m 2. If it is less than 300 g / m 2 , the rigidity necessary for use as a tatami core material or the like cannot be obtained. On the other hand, if it exceeds 1500 g / m 2, it may cause an increase in cost.
[0017]
The rigidity of the high-rigidity nonwoven fabric of the present invention is required to be 1.0 to 3.0 kgf when the bending strength is carried out according to the JIS K7221 bending test. If it is less than 1.0 kgf, the rigidity becomes insufficient. For example, it is not preferable in that the cushioning property required for the tatami core material or the like cannot be obtained. On the other hand, if it exceeds 3.0 kgf, the rigidity becomes too high. This is not preferable in terms of workability in that it becomes difficult to sew and cut.
[0018]
The use of the high-rigidity nonwoven fabric of the present invention includes, in addition to the core material for tatami mats of the present invention, specifically, substitutes for veneer boards such as flooring core materials and wall core materials.
[0019]
The core material for tatami mats of the present invention may be composed only of such a polyester nonwoven fabric, but is used as a core material together with at least one selected from the group consisting of a wood-based insulation board, straw and carbonized cork. May be.
[0020]
In addition, when using at least one kind selected from the group consisting of wood-based insulation board, straw and carbonized cork, these may be laminated on one side of the polyester-based nonwoven fabric, or may be laminated on both sides, Usually, it is preferable to laminate on both front and back sides of a polyester-based nonwoven fabric, and the total thickness of straw and the like is 1: 2 to 2: 1, particularly 3: 4 to the thickness of the polyester-based nonwoven fabric. The ratio is preferably about 4: 3.
[0021]
The tatami mat for which the tatami core material of the present invention is used is preferably composed of the tatami mat core material having the characteristics described above. The tatami is covered with a commonly used tatami mat and sewn to the tatami floor with sewing threads . A non-woven sheet or the like is sandwiched between tatami mats to provide cushioning.
[0022]
As a manufacturing method of the highly rigid nonwoven fabric of this invention, the polyester type nonwoven fabric obtained after normal nonwoven fabric manufacture is further given to a water treatment process and a 120-220 degreeC heat processing process, and is manufactured.
[0023]
As a water treatment process used in the method for producing the highly rigid nonwoven fabric of the present invention, a water spray process, a dipping process, and the like can be mentioned as preferred methods, and the water spray process can appropriately and appropriately control a necessary amount of water. Particularly preferred.
Water treatment amount is appropriately applied by the device environment, with respect to the nonwoven fabric mass per unit area weight (g / m 2), 5 to 20% by weight per 1 m 2. If the amount is less than 5% by weight, it is difficult to obtain the effect of the steam set. If the amount exceeds 20% by weight, all moisture cannot be changed to steam in the heat treatment step, and may remain as moisture in the nonwoven fabric. .
It should be noted that where the basis weight of the high-rigidity nonwoven fabric is considerably heavy, the distinctive rigidity effect due to the water treatment process is not expected.
[0024]
【Example】
Prior to specific description of the present invention, a bending strength test method will be described.
(Bending strength test)
The sample size of each material of Example 1, Example 2 and Comparative Example 1 is 5 cm × 15 cm × 6 mm, and the bending strength test is performed in accordance with the JIS K7221 rigid foam plastic bending test. The measurement conditions were room temperature and the head speed was 20 mm / min. The number of samples was n = 3, and the average value and standard deviation value were calculated. The average bending strength was 1.0 to 3.0 kgf.
[0025]
Next, the present invention will be specifically described based on examples and comparative examples. In addition, this invention is not limited only to these Examples.
[0026]
Example 1
20% by weight of polyethylene terephthalate (PET) short fibers H588 (14 dtex × 51 mm) manufactured by Kanebo Synthetic Co., Ltd. and copolymerized PET short fibers 4080 (2.2 dtex ×) manufactured by Unitika Fiber Co., Ltd. as heat-bonding fibers. 51 mm) 80% by weight was opened, blended, carded and cross-layered, and then needle punched. Subsequently, water was sprayed from one side of the sample at a constant amount of 100 g / m 2 (10% by weight of the nonwoven fabric weight), and then subjected to heat treatment at 180 ° C. from both sides, with a basis weight of 1000 g / m 2 , a thickness of 10 mm, A short fiber nonwoven fabric (high rigidity nonwoven fabric) having a density of 0.10 g / cm 3 was obtained. This was cut into 910 mm × 1820 mm to obtain excellent high rigidity tatami core materials as shown in Table 1.
Straw was layered on both the front and back sides of this highly rigid tatami core, and the surface was covered with a tatami surface.
[0027]
Comparative Example 1
20% by weight of polyethylene terephthalate (PET) short fibers H588 (14 dtex × 51 mm) manufactured by Kanebo Synthetic Co., Ltd. and copolymerized PET short fibers 4080 (2.2 dtex ×) manufactured by Unitika Fiber Co., Ltd. as heat-bonding fibers. 51 mm) 80% by weight is opened, blended, carded, cross-layered, and then needle punched to produce a short fiber nonwoven fabric with a basis weight of 1000 g / m 2 , a thickness of 10 mm, and a density of 0.10 g / cm 3 (Tatami core material) was obtained. As shown in the results of Table 1, it was soft, had little bending strength, and could not be put to practical use.
[0028]
Example 2
20% by weight of polyethylene terephthalate (PET) short fibers H588 (14 dtex × 51 mm) manufactured by Kanebo Synthetic Co., Ltd. and copolymerized PET short fibers 4080 (2.2 dtex ×) manufactured by Unitika Fiber Co., Ltd. as heat-bonding fibers. 51 mm) 80% by weight was opened, blended, carded and cross-layered, and then needle punched. Subsequently, water was sprayed from one side of the sample at a constant amount of 70 g / m 2 (14% by weight of the nonwoven fabric weight), and then subjected to heat treatment at 180 ° C. from both sides to have a basis weight of 500 g / m 2 , a thickness of 7 mm, A short fiber nonwoven fabric having a density of 0.07 g / cm 3 was obtained. This was cut into 915 mm × 610 mm to obtain excellent high rigidity nonwoven fabric as shown in Table 1. This highly rigid nonwoven fabric was laminated with a decorative board and used as a flooring core material.
[0029]
[Table 1]
【The invention's effect】
As described above, according to the present invention, a high-rigidity nonwoven fabric excellent in uniform rigidity throughout the nonwoven fabric, a tatami-shaped core material having a good appearance, and a high-rigidity nonwoven fabric for use in a tatami floor using the nonwoven fabric can be easily produced. A manufacturing method can be provided that makes this possible.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002235467A JP4001794B2 (en) | 2002-08-13 | 2002-08-13 | Method for producing high-rigidity nonwoven fabric, high-rigidity nonwoven fabric, and core material for tatami mat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002235467A JP4001794B2 (en) | 2002-08-13 | 2002-08-13 | Method for producing high-rigidity nonwoven fabric, high-rigidity nonwoven fabric, and core material for tatami mat |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004076179A JP2004076179A (en) | 2004-03-11 |
| JP4001794B2 true JP4001794B2 (en) | 2007-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002235467A Expired - Fee Related JP4001794B2 (en) | 2002-08-13 | 2002-08-13 | Method for producing high-rigidity nonwoven fabric, high-rigidity nonwoven fabric, and core material for tatami mat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4001794B2 (en) |
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2002
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| JP2004076179A (en) | 2004-03-11 |
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