JP3588892B2 - Easy to recycle bed mat - Google Patents

Description

なお、本発明において、ピレスロイド系化合物の共力剤として、一般に知られているピペロニルブトキサイド、ピペロニルサイクロネン、プロピルアイソーム、スルホキサイド（イソサフロールのオクチルスルホキシド）、サフロキサン、トロピタル、セゾキサン、サイネピリン類などを併用することにより、防ダニ効果をより高めることが可能であり好ましい。
【００３３】
本発明の防虫ポリエステル繊維Ａ中のピレスロイド系化合物付着量は、０．０１重量％以上１．０重量％以下が好ましい。より好ましくは０．０２〜０．５重量％とするものである。
【００３４】
次に、本発明に用いるアミノシリコンとは、シリコンポリマーの分子中にアミノ基を有するもので、アミノ基以外にエポキシ基などの他の置換基を有していてもかまわない。
【００３５】
なお、アミノシリコンのアミノ当量は４．５×１０^２ 〜６．５×１０^３ グラム当量／モルとするものであることが好ましい。アミノ当量があまりに少ない場合には、ピレスロイド系化合物ならびに防錆剤との相溶性が良く、洗濯耐久性は良好であるが、ダニ忌避効果が低くなることがある。これはシリコンポリマーによって強固にピレスロイド系化合物が被覆されるためと考えられる。一方、アミノ当量があまりに大きい場合は、初期のダニ忌避効果は優れているが、ドライクリーニング等の洗濯により忌避性能が低下することがある。
【００３６】
本発明の防虫ポリエステル繊維を使用して繊維成形体を製造する場合、混綿機や開繊機、梳綿機、成形機等の機械を錆させることがあり、防錆剤を繊維に付与することが好ましい。本発明において防錆剤としては、前記一般式で示されるアミノ系の化合物を用いるものである。かかる構造のアミノ系化合物以外の防錆剤では、本発明において用いるピレスロイド系化合物のダニ忌避効果、ダニ増殖抑制効果が阻害されるという問題がある。かかるアミノ系化合物の具体例としては、次の化合物が使用できる。
【００３７】
【化３】

ここで、ＸはＮａまたはＫなどのアルカリ金属を意味する。
【００３８】
【化４】

ここで、Ｒ_１ はＣ_{４ 〜 １８}のアルキル基、Ｒ_２ はＣ_{２ 〜 ４} のアルキレン基、ＸはＮａまたはＫなどのアルカリ金属を意味する。
【００３９】
なお、かかる一般式で示される防錆剤に、さらにオクチルホスフェートカリ塩などのアルキルホスフェート系化合物や、亜硫酸ナトリウム等を併用すると、該一般式で示される化合物の防錆効果はさらに向上するので好ましい。
【００４０】
本発明において、ピレスロイド系化合物に対するアミノシリコンの重量比は１：１〜１：２０とすることが好ましいものである。ピレスロイド系化合物に対するアミノシリコンの重量比があまりに少ないと、防ダニ性の洗濯耐久性が著しく低下することがある。一方、重量比があまりにも高いと、防虫効果が低くなる。これは、ピレスロイド系化合物がアミノシリコン被膜で覆われてしまい、ピレスロイド系化合物が表面に現れにくくなるためと思われる。
【００４１】
本発明において、ピレスロイド系化合物に対する防錆剤の重量比は１：０．５〜１：１０とすることが好ましいものである。ピレスロイド系化合物に対する防錆剤の重量比があまりにも少ないと、防錆効果が低く、一方、重量比があまりに高いと、防虫効果が低下するとともに、防虫効果の洗濯耐久性が低下することがある。これは、一般に防錆剤の無機性が強いため、アミノシリコンの造膜性に悪影響を及ぼしたり、ポリエステル繊維との親和性が低下することによるものと考えられる。
【００４２】
本発明の防虫ポリエステル繊維の製造方法としては、例えば、上記したピレスロイド系化合物、アミノシリコンおよび防錆剤を非イオン系界面活性剤もしくはアニオン系界面活性剤またはこれらの併用物で乳化分散した水エマルジョン組成物とし、繊維に対し目標付与量になるように混合したものをスプレー方式、浸漬・遠心脱水方式で付与した後、必要に応じ８０〜１２０℃で予備乾燥後、１５０〜２００℃で熱処理することによって製造することができる。
【００４３】
次に、防虫ポリエステル繊維Ａや防虫加工を施していないポリエステル繊維Ｂの断面形状は丸形の中空以外に、多角、楕円などの異形断面中空でもよい。
【００４４】
さらに、本発明の繊維成形体に嵩高性、ソフト感を付与し、圧縮に対する回復性を向上させるため、防虫ポリエステル繊維Ａや防虫加工を施していないポリエステル繊維Ｂが機械捲縮を有するのが好ましい。この捲縮数は繊維成形体の用途によって適宜選択すればよいが、捲縮数は少なくとも３山／２５ｍｍで捲縮度が少なくとも５％となるのが好ましい。一層の嵩高性を付与するため、この捲縮が紡糸時に非対称冷却などによって発現する潜在捲縮であることは好ましい。
【００４５】
繊維成形体を構成する防虫ポリエステル繊維Ａや防虫加工を施していないポリエステル繊維Ｂとしては、繊維成形体の形態固定性やソフト感付与の観点から、繊度が０．５〜３０デニール、繊維長が１０〜１００ｍｍの短繊維が好ましく用いられる。
【００４６】
この他、防虫ポリエステル繊維Ａや防虫加工を施していないポリエステル繊維Ｂには必要に応じて酸化チタン、カーボンブラック等の顔料のほか抗酸化剤、着色防止剤、耐光剤、帯電防止材などが添加されていても勿論よい。
【００４７】
次に、本発明のベッドマットのマット中材である繊維成形体の製造方法例について説明する。図２は、本発明の繊維成形体の製造方法の一例に用いられる装置の金型の縦断面図である。
【００４８】
前記繊維Ａと複合繊維Ｃまたは繊維Ａ、その他の繊維Ｂおよび複合繊維Ｃとを、通常の紡績工程で使用する給綿機、混綿機、開繊機によって、十分に混綿、開繊し、目的に応じた形状の通気性型枠に送綿ファンによる空気流などの気体と共に吹き込んで充填する。
【００４９】
吹き込んで充填するためには、型枠が適度の通気性を有するものを使用する。例えば、ＪＩＳ Ｌ １０７９−１９６６フラジール型通気性試験機により測定した際においては、通気性は５〜２００ｃｃ／ｃｍ^２ ・ｓｅｃの範囲が好ましい。
【００５０】
このような型枠としては、例えば、図２に示すパンチング金属板を用いた金型１、２を用いることができる。通気性型枠内に吹込み口３から吹込まれた繊維混合物４は、タテ、ヨコ、厚み方向にランダムに配列した状態となる。
【００５１】
次に、充填した繊維混合物を金型２で圧縮して適当な密度にする。密度は、０．０２５〜０．０５５ｇ／ｃｍ^３ であると好ましい。密度があまりに低いと、繊維成形体がソフトすぎて形態安定性が悪くなり、希望の形状に裁断、成形し難くなることがある。また、密度があまりに高くなると、繊維成形体のソフト感が低下することがある。
【００５２】
また、この圧縮処理は本発明の繊維成形体の繊維軸方向を使用する繊維成形体の厚み方向の断面（ｂｄｅｆ）に対し略平行に配列させて、狙いの屈曲性を高める作用もある。
【００５３】
圧縮した充填物を熱処理して、複合繊維Ｃ相互間および繊維Ｃと繊維Ａやその他の繊維Ｂとの接触点の一部を接着して形態を固定する。熱処理の温度は繊維ＣのＲ１が溶融接着する温度であればよく、一般的には、８０〜２００℃が好ましい。
【００５４】
さらに、本発明は、複合繊維Ｃの熱可塑性重合体Ｒ１の融点未満の温度下で、前記吹き込み充填後の圧縮方向に対し垂直な２方向の内２方向または２方向の内１方向に５〜８０％の範囲で１回以上仕上げ２次圧縮処理して本発明の繊維成形体とすことも望ましい。本発明の繊維成形体は、圧縮弾力性、屈曲性、透湿性、透水性の優れたものとするため、使用される用途の例えば着座位や就寝位で圧縮作用を受ける方向の面に構成繊維の多くの繊維軸方向を平行に配列する。そのためには、前記繊維成形体製造時の２次圧縮処理方向が使用される用途の例えば着座位や就寝位で圧縮作用を受ける方向、つまりその用途の厚み方向とする。この場合、２次圧縮処理によって繊維ＡのＲ１で溶融接着した不必要な接着点をあらかじめ除去し、繊維成型体使用時のソフト感や圧縮回復性を良好にする作用がある。
【００５５】
【実施例】
次に本発明を実施例によりさらに具体的に説明する。本発明に記述した諸特性の測定法は次の通りである。
【００５６】
（１）撓み量
幅１０ｃｍ、厚み５ｃｍ、長さ５０ｃｍの長方形のマット中材試験片を３個準備し、水平な台上にのせ、試験片をすべらせて台の端から長さ３０ｃｍ出した状態で１分間放置後、台の上面と試験片の先端の下面の高さの差（撓み量ｍｍ）をスケールで読みとり、３回の平均値で表わした。
【００５７】
（２）防虫性（ダニ忌避率）
直径２００ｍｍ、高さ３０ｍｍのシャーレにダニ繁殖中の粉末飼料＜日本クレア（株）ＣＦ−２＞をできるだけ均一に拡げ、この上に１ｇの繊維成型体を開繊して８×８ｃｍのほぼ正方形に拡げ、これとは別に防虫加工されていない通常のポリエステルの綿１ｇを前記と同様に８×８ｃｍのほぼ正方形に拡げ、それぞれ左右対称に１枚ずつ置いた。この綿上の中央の高さ１．４ｃｍのところに、ダニの全く入っていない粉末飼料（水分１５％）１ｇを入れた直径２．８ｃｍの容器を置き、室温２５±２℃、湿度７０〜８０％ＲＨの範囲に調節したふ卵器に入れ４０時間放置した後、容器の中の飼料中に侵入したダニ数を食塩水浮遊法で数え、次式でダニ忌避率を求めた。
【００５８】
ダニ忌避率（％）＝｛（Ａ−Ｂ）／Ａ｝×１００
ここで、Ａは通常のポリエステルの綿のダニ数、Ｂは繊維成形体の開繊綿のダニ数。
【００５９】
（３）繊度
ＪＩＳ Ｌ１０１５−７−５１Ａの方法に準じて測定した。
【００６０】
（４）平均繊維長＜カット長＞
ＪＩＳ Ｌ １０１５Ａ法（ステープルダイヤグラム法）に準じて測定した。
（５）巻縮数および巻縮度
巻縮数および巻縮度はＪＩＳ Ｌ１０１５−７−１２−１およびＪＩＳ Ｌ１０１５−７−１２−２の方法に準じて測定した。
【００６１】
（６）充填密度
試験片（タテ：２０ｃｍ、ヨコ：２０ｃｍ、厚さ：２０ｃｍ）を２０℃×６５％ＲＨの雰囲気中に２４時間放置した後の重量（ｗ）を測定し、次式で求めた。
密度（ｇ／ｃｍ^３ ）＝ｗ／８０００
［実施例１〜３および比較例１〜２］
ベッドマットのマット中材用防虫ポリエステル繊維Ａとして、融点が２５５℃の通常ポリエチレンテレフタレートのチップを、紡糸温度２８０℃、引取り速度１３５０ｍ／分で、紡糸口金の出口で非対称冷却した未延伸糸を紡糸した。
【００６２】
次いで、この未延伸糸を延伸浴温度８０℃で延伸し、クリンパで機械捲縮を付与した。さらにピレスロイド系化合物としてフェノトリンをノニルフェノールのエチレンオキサイド９モル添加物で乳化し、ピレスロイド系化合物が０．１重量％になるように、また、バインダーとして、アミノ当量が３．５×１０^３ グラム当量／モルであるアミノシリコーン（ＴＫシリコーンＡＳ６５、高松油脂（株）製）を固形分換算で０．５重量％になるように、さらに防錆剤としてエチレンジアミン４酢酸の２ナトリウム塩を固形分換算で０．１５重量％になるように調整した水エマルジョン組成物をスプレーで付与し、カット長３０ｍｍに切断し、１７５℃の熱処理をして繊度１３デニール、捲縮数４．５山／２５ｍｍ、捲縮度２５．２％、中空率３０％の円形中空断面構造の防虫ポリエステル繊維Ａを得た。この繊維Ａのフェノトリン付着量は０．１５重量％、アミノシリコーン付着量は０．５重量％、防錆剤付着量は０．１５重量％であった。このステープル１００％の防錆性は、塩酸でメッキ、油分を落とした鉄の針金を、前記綿の中にくるみ２５℃、７５％ＲＨの恒温恒湿槽で７２時間放置後でもほとんど錆が発生せず良好で、ダニ忌避率は洗濯前９９．４％、パークレン液で４０℃、１０分間洗浄する工程を３回繰り返した後９４．１％であった。
【００６３】
これとは別に、マット中材用複合繊維Ｃとして、Ｒ２は融点が２５５℃の通常ポリエチレンテレフタレートチップを使用し、Ｒ１はイソフタル酸４０モル％共重合した融点が１１０℃のポリエチレンテレフタレート系ポリエステルを用いて、紡糸温度２８５℃、引取り速度１３５０ｍ／分、Ｒ１／Ｒ２で表される重量比が５０／５０のＲ２を芯部とし、Ｒ１を鞘部とした同心円状の複合繊維Ｃの未延伸糸を紡糸した。
【００６４】
次いで、この未延伸糸を延伸浴温度８０℃で延伸し、クリンパで機械捲縮を付与した。さらに、７０℃の熱セッターで乾燥した後、仕上げ油剤を付与して、カット長５１ｍｍに切断して、繊度約４デニール、表面層の融点が約１１０℃の複合繊維Ｃを得た。
【００６５】
前記繊維Ａおよび繊維Ｃを表１の混綿割合で混綿し、ローラカードでさらに混綿・開繊し、図２のような金型の吹込口から、各面にパンチングが施された、内面の幅×長さ×深さが８２×８４×１００ｃｍの下金型３に、空気流と共に吹き込んで充填した。吹き込まれた繊維混合物４を各面にパンチングが施された上金型２で圧縮し、充填密度０．０４ｇ／ｃｍ^３ 、厚さ５０ｃｍで固定した。金型に充填圧縮した繊維混合物４を、紡績糸のセットに使用するヒートセッターを用いて、蒸熱１３０℃×２５分間熱セットし、繊維成形体を得た。次に、得られた前記繊維成形体の圧縮方向に対し垂直な方向を上下方向（厚み方向）として、厚さ７ｃｍにスライスし、該スライスシートを横にならべて互いに接着した後裁断して、幅８２ｃｍ、長さ１９２ｃｍ、厚さ７ｃｍのベッドマット中材とした。
【００６６】
さらに、表１のように実施例１、２および比較例２のベッドマット中材については、大型油圧機を用いて室温状態で厚さ方向に圧縮率５０％で５回仕上げ圧縮処理した。
【００６７】
さらに、ベッドマットのカバー（側地）としてはポリエステル７５デニールの仮撚加工糸を用いた両面丸編地をポリエステルのスパン縫糸で縫製し、品質や取扱表示ラベルにはポリエステルスパンボンドを使用してベッドマットとした。
【００６８】
このベッドマットを１年間使用したところ、実施例１〜３のベッドマットは撓み量が５．１〜２０ｃｍで、ギャッジベツドの電動変化に良く追従し、屈曲性の良好なもので、防虫性（ダニ忌避率）、洗濯等での取扱性も良好であって、かつ洗濯での水切れ性に優れ、透湿性、透水性が良好で快適な使用感を有するものであった。
【００６９】
これに対し、比較例１は、撓み量が４．６ｃｍでギャッジベツド用としての屈曲性がやや不良であって、座位での座り心地が劣り、防虫性も劣るものであった。
【００７０】
また、比較例２は、屈曲性や防虫性は良好であるが、撓み量が２３．１ｃｍでやや曲がり易く、マット中材をカバーに挿入しにくいと同時に、洗濯等でマットを移動させる場合の取扱性が劣るものであった。
【００７１】
実施例１〜３の使用後のベッドマットを回収し、反毛機にかけて解繊した後、この開繊繊維を溶融ペレット化し、再度溶融紡糸・延伸して、１３デニール、３０ｍｍのポリエステルステープルとした。得られたステープルはやや灰色味を帯びたポリエステルステープルで、市販の通常ポリエステルステープルに比べてやや強度が低いものの、詰綿として十分使用可能なものであった。
【００７２】
実施例１〜３および比較例１〜２のベッドマット中材の加工方法や性質を表１に示す。
【００７３】
［実施例４］
実施例１で、防虫ポリエステル繊維Ａを製造する際、防虫加工を施さないステープルをポリエステル繊維Ｂとし、防虫ポリエステル繊維Ａを４０重量％、防虫加工を施さないポリエステル繊維Ｂを２０重量％、複合繊維Ｃを４０重量％混綿するほかは実施例２と同様にしてベッドマットとし、１年間使用した。該ベッドマットは屈曲性、防虫性、洗濯等での取扱性も良好であって、洗濯での水切れ性に優れ、透湿性、透水性が良好で快適な使用感を有するものであった。
【００７４】
実施例４の使用後のベッドマットを回収し、反毛機にかけて解繊した後、この開繊繊維を溶融ペレット化し、再度溶融紡糸・延伸して、１３デニール、３０ｍｍのポリエステルステープルとした。得られたステープルはやや灰色味を帯びたポリエステルステープルで、市販の通常ポリエステルステープルに比べてやや強度が低いものの、詰綿として十分使用可能なものであった。
【００７５】
実施例４のベッドマット中材の加工方法や性質を表１に示す。
【００７６】
【表１】

忌避率は、ベッドマット製作直後のマット中材についての値であり、Ｌ−０はドライ洗濯なしの場合、Ｌ−３はパークレン液で４０℃、１０分間洗浄し、脱溶剤する工程を３回繰り返した場合の値である。
【００７７】
【発明の効果】
本発明によれば、効率的にリサイクル化でき、医療用ベッドなどに必要な屈曲性があり、ダニなどの害虫が忌避し、または害虫の増殖を抑制する防虫効果があつて、かつその効果がドライクリーニングに対して耐久性を有し、透湿性・透水性が高く快適な使用感を有し、しかも環境面で問題を生じ難いベッドマットを得ることができる。
【図面の簡単な説明】
【図１】本発明に用いるブロック形状繊維成形体の一例を示す斜視図である。
【図２】本発明に用いる繊維成形体の製造装置の一例を示す縦断面図である。
【符号の説明】
１：下金型
２：上金型
３：気体の吹き込み口
４：繊維混合物[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is easy to recycle, and has the flexibility required for medical bed mats and the like, has the effect of repelling pests such as mites, or suppressing the growth of pests, and the effect is good for dry cleaning. The present invention relates to a bed mat which is durable, has high moisture permeability and high water permeability, and has a comfortable feeling of use.
[0002]
[Prior art]
In recent years, due to the two needs of environmental protection of the earth and efficient use of resources, the problem of the treatment and reuse of industrial waste and general household waste has been increasing in importance, and in many fields and many People are showing interest. However, in the field of bed mats, most used bed mats have been incinerated or landfilled, and recycling technology is still in the development stage.
[0003]
Conventionally, recycling technologies proposed for textile products can be roughly classified into the following three.
[0004]
The first is thermal recycling. In this method, products are cut into appropriate forms, burned, and reused as in-house power generation and various types of heat energy. However, this method is not preferable from the viewpoint of resource reuse.
[0005]
The second is material recycling. This method is different from the following chemical recycling in that it is physically and mechanically pelletized. When this recycled pellet is reused, it is divided into two cases. One is to develop a product as a new material in consideration of the fact that various materials are mixed, such as flower beds, bonsai pots, and sidewalk decorative piles. The other is a case in which 100% identical material is used as described in JP-A-5-219935 and JP-A-6-123052, collected, pelletized, melted and reused. . However, in this method, in order to make all components the same, in the case of 100% nylon disclosed in Japanese Patent Application Laid-Open No. Hei 5-212935, the tufted base fabric, the sealing layer, and the backing layer are changed from inexpensive materials to expensive materials. Is essential and may not be economical.
[0006]
Third is chemical recycling. The chemical recycling that best fits the basic concept of recycling is chemical recycling, in which products are collected, decomposed, and returned to their original raw materials. However, fiber products are generally rarely produced as a single material, and the composition of the materials is diverse. Therefore, it takes a while to develop an economical depolymerization system. Means for solving this problem, for example, in the case of a carpet product, is described in Japanese Patent Application Laid-Open No. 5-117441. As an auxiliary means for improving the efficiency of depolymerization, the carpet is cut into small pieces, separated into small pieces containing nylon 6 which is a pile material and other small pieces with a separator, and the small pieces containing nylon 6 are supplied to a depolymerization system. Ε-caprolactam as a raw material. However, it has been difficult to efficiently recycle even if a fiber product is divided into small pieces and separated by mechanical means, for example, due to a difference in specific gravity due to a cyclone.
[0007]
On the other hand, as a mat material of a bed mat, a resin foam such as polyurethane has generally been mainly used. However, resin foams have environmental problems such as the use of chlorofluorocarbon gas or a substitute gas during foaming and the generation of toxic gases during combustion. In addition, air permeability and moisture permeability are low, and they are easily stuffy. In addition, when a solution such as water or urine is applied, the water permeability is low.
[0008]
Cushion materials (fiber stuffing materials) as mat materials for solving these problems are disclosed in, for example, JP-B-62-2155, JP-B-1-18183, JP-B-4-33478, and JP-A-3-140185. It has been proposed in gazettes and the like. These cushioning materials are composed of a core-sheath composite fiber using a low-melting fiber as a heat-adhesive fiber or a high-melting thermoplastic resin as a core and a low-melting thermoplastic resin as a sheath. The use of has produced some results, but further improvement is desired.
[0009]
[Problems to be solved by the invention]
The object of the present invention is easy to recycle, insect repellent and flexible, hard to compress, soft, high in moisture permeability and water permeability, comfortable to use, and environmentally friendly. And to provide a bed mat which is less likely to cause problems.
[0010]
[Means for Solving the Problems]
The bed mat of the present invention has the following configuration to solve the above-mentioned problem.
[0011]
That is, the mat material of the bed mat is a bed mat that is a fiber molded product containing at least insect-proofed polyester fiber A, and most of the constituent fibers of the mat material have a cross section in the thickness direction of the mat material ( bdef), the fiber axis direction is arranged substantially parallel, and arranged in a random direction in the cross section (bdef) in the thickness direction of the mat material, and the mat material was measured by the method described in the text. An easily recyclable bed having an amount of bending of 5 to 20 cm and wherein a mat material, a cover of the mat, and a sewing thread of the cover which constitute the bed mat are all made of fibers made of a polyester polymer. Matt.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the bed mat of the present invention will be described in detail with reference to the drawings and embodiments.
[0013]
The present invention is an easily recyclable bed mat. As described above, a general bed mat has a structure in which a resin foam such as polyurethane is used as an inner material of the bed mat, and the core material is wrapped with a cover such as cotton or polyester. Further, the cover is made of a cloth such as cotton or polyester with sewing threads, fasteners and quality indicating labels having different chemical compositions. Although it is not easy to recycle a bed mat composed of these various materials, the bed mat of the present invention is intended to obtain a bed mat that can be easily recycled while maintaining the required quality of the bed mat.
[0014]
The bed mat of the present invention is an easily recyclable bed mat in which the material inside the bed mat is a fiber molded body, and the fabric and sewing thread constituting the cover of the bed mat are made of fibers of a polyester polymer. In addition, it is preferable that accessories such as a fastener and a quality display label be made of a fiber made of a polyester-based polymer, if necessary.
[0015]
The bed mat of the present invention can be recycled by any of material recycling, chemical recycling, and thermal recycling. However, since the bed mat material, the cloth constituting the cover of the bed mat, and the sewing thread are made of polyester fiber, the bed mat is collected. It is easy and preferable because the bed mat is cut, opened, melted and pelletized and recycled.
[0016]
FIG. 1 is a perspective view showing an example of a fiber arrangement in a block shape of a fiber molded body for a mat middle material of a bed mat of the present invention.
[0017]
The fibrous molded article is a fibrous molded article composed of two or more kinds of fibers, and includes at least an insect-resistant polyester fiber A, usually having polyester (R2) as a core component, and having a melting point of the insect-resistant polyester fiber A. Or a composite fiber C having a thermoplastic polymer R1 at least on the fiber surface side that is at least 20 ° C. lower than the polyester fiber B that has not been subjected to insect repellent treatment and the polyester (R2), and a polyester fiber A that has been subjected to insect repellent treatment, or The composite fiber C is composed of the insect-treated polyester fiber A and the insect-proof polyester fiber B, and at least the contact points between the composite fibers C and between the composite fiber C and the polyester fibers A and B. Some of the constituent fibers of the mat material are partly adhered and molded, and many of the mat fibers have a cross section in the thickness direction (bdef). And arranged substantially parallel to the fiber axis direction against, but arranged in random directions in the thickness direction of the mat in material cross-section (BDEF).
[0018]
Here, in order to increase the flexibility of the mat material, most of the constituent fibers are arranged such that the fiber axis direction is substantially parallel to the cross section (bdef) in the thickness direction of the fiber molded body as shown in FIG. It is arranged in a random direction within the cross section (bdef) in the thickness direction of the molded body. When used as a cushion body, the number of fibers arranged substantially parallel to the thickness direction, that is, the direction subjected to a compressive action is increased. Thus, it has a structure that also enhances the compression recovery and repulsion.
[0019]
Many of the constituent fibers are arranged such that the fiber axis direction is substantially parallel to the cross section (bdef) in the thickness direction of the fiber molded body as shown in FIG. 1 and are random in the cross section (bdef) in the thickness direction of the fiber molded body. The main purpose of arranging in a different direction is, for example, in a bed of a type that can change the bed from a sleeping position to a sitting position, such as a medical bed, the bed mat also deforms in a similar manner according to the change of the bed Another object of the present invention is to prevent only the bed mat from floating from the bed body. To this end, the longitudinal direction of the mat material (cushion material) for the bed mat is made to coincide with the ab line direction of the fiber molded body, and the fiber axis direction is substantially parallel to the cross section (bdef) in the thickness direction of the mat material. It is important that the fiber axis direction is arranged in a random direction with a cross section (bdef) in the thickness direction so that the long direction of the bed mat is easily bent. It is important that the degree of flexibility is such that the amount of deflection measured by a characteristic evaluation method described later is 5 to 20 cm. If it is less than 5 cm, the mat is unpreferably because the mat is lifted from the bed or wrinkled due to poor flexibility. If it exceeds 20 cm, problems arise such as poor handling when the mat is moved by washing or the like.
[0020]
Further, most of the constituent fibers are arranged so that the fiber axis direction is parallel to the cross section (bdef) in the thickness direction of the fiber molded body, and are arranged in a random direction in the cross section (bdef) in the thickness direction of the fiber molded body. By doing so, it is possible to obtain a fiber molded article having high durability due to washing and use, high moisture permeability and high water permeability, and a high feeling of comfortable use, even though the flexibility is good.
[0021]
Here, there are a large number of cross sections in the thickness direction, such as a plane having an angle along the ae line in FIG. 1 and a plane having an angle along the ab line in FIG. 1, but the cross section in the thickness direction (bdef) in which the fibers are arranged substantially in parallel is shown. Since the fibers are arranged substantially parallel to the plane at this angle only at the plane along the be line, when the fiber molded body is pulled or distorted, it is relatively easy to peel off as compared to the plane at other angles. It is an angle plane.
[0022]
As the structure of the middle material of the bed mat, the middle material having the above-mentioned fiber arrangement is preferable, but in addition, the fibers to be used are mixed and opened, and further mixed and opened with a card to form a web, and laminated by a cotton forming machine. After forming the web, the web is folded into a wave shape, and the wave height of the wave is set to the thickness of the mat, and is fixed by the low melting point fiber in the used fiber, so that the inner material of the bed mat having increased flexibility can be obtained. .
[0023]
Insect-resistant polyester fiber A, non-insect-resistant polyester fiber B, and composite fiber C have a ratio of insect-resisting polyester fiber of 40% by weight or more in terms of insect repellency. Those containing less than 80% by weight in total with the insect-proof polyester fiber A are preferred. It is preferable that the content of the conjugate fiber C be 20% by weight or more and less than 60% by weight from the viewpoints of shape retention, durability, cushioning property, soft feeling and insect repellency of the fiber molded body in the bed mat. . In particular, the range of 20 to 50% by weight is preferable.
[0024]
The composite fiber C is composed of the two components R1 and R2, and R1 is, for example, a polyolefin or olefin copolymer such as polyethylene, polypropylene, ethylene propylene copolymer, ethylene butene copolymer, and ethylene vinyl acetate copolymer. And at least one polymer selected from thermoplastic polymers such as polyesters such as polyhexamethylene terephthalate, polyhexamethylene butylene terephthalate, and polyhexamethylene terephthalate isophthalate, and copolymerized polyesters. R2 is not particularly limited. For example, polyethylene terephthalate, polybutylene terephthalate, or terephthalic acid, 2,6-naphthalenedicarboxylic acid or an ester thereof as a main dicarboxylic acid component, and ethylene glycol or tetramethylene glycol as a main glycol component. Polyesters such as polyethylene 2,6-naphthalate are exemplified.
[0025]
In the selection of R1, the melting point of the fiber A, the other fibers B and R2 is lower than that of the lowest fiber, and is preferably 20 ° C. or higher, and more preferably 50 ° C. or higher from the viewpoint of thermal adhesion. Is more preferred.
[0026]
Further, the melting point of R1 is preferably in the range of 80 to 170 ° C, more preferably in the range of 100 to 170 ° C, from the viewpoint of the effect of adhesion and prevention of thermal deterioration.
[0027]
The weight ratio represented by R1 / R2 in the conjugate fiber C is from 20/80 to 20/80 in view of shape retention, durability, cushioning property, recycling efficiency in the case of recycling, cost, etc. It is preferably in the range of 60/40.
[0028]
In addition to the pigments such as titanium oxide and carbon black other than R1 and R2, if necessary, the conjugate fiber C may be added with an antioxidant, an anti-coloring agent, a light-proofing agent, an antistatic material, or the like. Good. Such a composite fiber C can be produced by a usual composite spinning method.
[0029]
Next, the composite fiber C preferably has mechanical crimping or the like in order to impart bulkiness and softness to the fiber molded article of the present invention and to improve recovery from compression. The number of crimps may be appropriately selected depending on the use of the fiber molded body, but it is preferable that the number of crimps be at least three peaks / 25 mm and the degree of crimp be at least 5%.
[0030]
Short fibers having a fineness of 0.5 to 30 denier and a fiber length of 10 to 100 mm are preferably used as the conjugate fiber C constituting the fiber molded article from the viewpoints of bulkiness and softness.
[0031]
The insect-controlling polyester fiber A used in the fiber molded article of the present invention is preferably one to which a pyrethroid compound is provided. Examples of the pyrethroid compound include phenothrin (a 2: 8 mixture of 3-phenoxybenzyl ester of d-cis chrysanthemic acid), synthetic pyrethrin, alectrin, furtaltrin, barthrin, dimethrin, and natural pyrethrin. Among these pyrethroid compounds, even when subjected to a high temperature treatment of 150 ° C. or more, the volatility is low, and the compatibility with amino silicon described later is good, and the mite repellent effect and the reduction of the mite growth inhibitory effect by washing are reduced. Phenothrin represented by the following chemical formula is preferable from the viewpoints of being low and having excellent safety.
[0032]
Embedded image

In the present invention, as a synergist for the pyrethroid compound, generally known piperonyl butoxide, piperonyl cyclone, propyl isomer, sulfoxide (octyl sulfoxide of isosafrole), safloxane, tropital, sezoxane It is preferable to use a combination of sinepirins and the like because it is possible to further enhance the anti-mite effect.
[0033]
The adhesion amount of the pyrethroid compound in the insect-controlling polyester fiber A of the present invention is preferably from 0.01% by weight to 1.0% by weight. More preferably, the content is 0.02 to 0.5% by weight.
[0034]
Next, the aminosilicon used in the present invention has an amino group in the molecule of the silicon polymer, and may have another substituent such as an epoxy group in addition to the amino group.
[0035]
The amino equivalent of amino silicon is 4.5 × 10²~ 6.5 × 10³It is preferred that it be gram equivalent / mol. If the amino equivalent is too small, the compatibility with the pyrethroid compound and the rust inhibitor is good and the washing durability is good, but the mite repellent effect may be low. This is probably because the pyrethroid-based compound is firmly covered with the silicon polymer. On the other hand, if the amino equivalent is too large, the initial mite repellent effect is excellent, but the repelling performance may be reduced by washing such as dry cleaning.
[0036]
When producing a fiber molded body using the insect-proof polyester fiber of the present invention, a machine such as a cotton blender, a fiber opening machine, a carding machine, and a molding machine may be rusted, and a rust preventive may be applied to the fiber. preferable. In the present invention, an amino compound represented by the above general formula is used as a rust preventive. Rust inhibitors other than amino compounds having such a structure have a problem that the mite repellent effect and the mite growth inhibitory effect of the pyrethroid compound used in the present invention are inhibited. The following compounds can be used as specific examples of such amino compounds.
[0037]
Embedded image

Here, X means an alkali metal such as Na or K.
[0038]
Embedded image

Where R₁Is C_{4 ~ 18}An alkyl group of R₂Is C_{2 ~ 4}And X represents an alkali metal such as Na or K.
[0039]
In addition, when the rust preventive agent represented by the general formula is further used in combination with an alkyl phosphate compound such as octyl phosphate potassium salt or sodium sulfite, the rust preventive effect of the compound represented by the general formula is further improved, so that it is preferable. .
[0040]
In the present invention, the weight ratio of aminosilicon to the pyrethroid compound is preferably from 1: 1 to 1:20. If the weight ratio of aminosilicon to the pyrethroid compound is too small, the mite-proof washing durability may be significantly reduced. On the other hand, if the weight ratio is too high, the insect repellent effect will be reduced. This is presumably because the pyrethroid-based compound is covered with the aminosilicon film, making it difficult for the pyrethroid-based compound to appear on the surface.
[0041]
In the present invention, the weight ratio of the rust inhibitor to the pyrethroid compound is preferably from 1: 0.5 to 1:10. If the weight ratio of the rust inhibitor to the pyrethroid compound is too small, the rust inhibitory effect is low, while if the weight ratio is too high, the insect repellent effect is reduced and the washing durability of the insect repellent effect may be reduced. . It is considered that this is due to the fact that the rust preventive generally has a strong inorganic property, which adversely affects the film forming property of aminosilicon and lowers the affinity for the polyester fiber.
[0042]
Examples of the method for producing the insect-resistant polyester fiber of the present invention include, for example, a water emulsion obtained by emulsifying and dispersing the above-described pyrethroid compound, aminosilicone, and a rust inhibitor with a nonionic surfactant or an anionic surfactant or a combination thereof. After the composition is applied to the fiber and mixed so as to have a target application amount by a spray method, immersion / centrifugal dehydration method, after preliminarily drying at 80 to 120 ° C as necessary, heat treatment is performed at 150 to 200 ° C. Can be manufactured.
[0043]
Next, the cross-sectional shape of the insect-resistant polyester fiber A or the polyester fiber B that has not been subjected to the insect-proof treatment may be hollow, such as polygonal or elliptical, in addition to a round hollow.
[0044]
Further, in order to impart bulkiness and softness to the fiber molded article of the present invention, and to improve recovery from compression, it is preferable that the insect-resistant polyester fiber A and the polyester fiber B not subjected to insect-proof processing have mechanical crimp. . The number of crimps may be appropriately selected depending on the use of the fiber molded body, but it is preferable that the number of crimps be at least three peaks / 25 mm and the degree of crimp be at least 5%. In order to impart more bulkiness, it is preferable that the crimp is a latent crimp developed by asymmetric cooling or the like during spinning.
[0045]
Insect repellent polyester fiber A or polyester fiber B not subjected to insect repellent processing constituting the fiber molded body has a fineness of 0.5 to 30 denier and a fiber length of from the viewpoint of form fixability and softness of the fiber molded body. Short fibers of 10 to 100 mm are preferably used.
[0046]
In addition, pigments such as titanium oxide and carbon black, as well as antioxidants, coloring inhibitors, light stabilizers, antistatic materials, and the like are added to the insect-resistant polyester fiber A and the polyester fiber B that has not been subjected to insect-proof treatment, if necessary. Of course, it may be done.
[0047]
Next, a description will be given of an example of a method for producing a fiber molded body that is a medium material of the bed mat of the present invention. FIG. 2 is a longitudinal sectional view of a mold of an apparatus used in an example of the method for producing a fiber molded article of the present invention.
[0048]
The fiber A and the composite fiber C or the fiber A, the other fiber B and the composite fiber C are sufficiently mixed and spread by a cotton feeder, a cotton blender, and a fiber spreader used in a normal spinning process. The gas is blown into the air-permeable mold of the corresponding shape together with a gas such as an air flow by a cotton fan to fill the air-permeable mold.
[0049]
In order to fill by blowing, a mold having an appropriate air permeability is used. For example, when measured by a JIS L 1079-1966 Frazier-type air permeability tester, the air permeability is 5 to 200 cc / cm.²-The range of sec is preferable.
[0050]
As such a mold, for example, dies 1 and 2 using a punched metal plate shown in FIG. 2 can be used. The fiber mixture 4 blown from the blowing port 3 into the air-permeable mold is in a state of being randomly arranged in the length, width, and thickness directions.
[0051]
Next, the filled fiber mixture is compressed by the mold 2 to an appropriate density. Density is from 0.025 to 0.055 g / cm³Is preferable. If the density is too low, the fiber molded body is too soft, resulting in poor form stability, and it may be difficult to cut and mold into a desired shape. If the density is too high, the softness of the fiber molded body may be reduced.
[0052]
This compression treatment also has the effect of arranging the fiber molded body of the present invention in a direction substantially parallel to the cross section (bdef) in the thickness direction of the fiber molded body using the fiber axis direction, thereby increasing the intended flexibility.
[0053]
The compressed filler is heat-treated to adhere a part of the contact points between the composite fibers C and between the fibers C and the fibers A and other fibers B to fix the form. The temperature of the heat treatment may be a temperature at which R1 of the fiber C is melt-bonded, and is generally preferably 80 to 200 ° C.
[0054]
Further, the present invention relates to a method of forming the composite fiber C at a temperature lower than the melting point of the thermoplastic polymer R1 in the two directions perpendicular to the compression direction after the blow-filling or in one of the two directions. It is also desirable that the fiber molded article of the present invention be subjected to a finishing secondary compression treatment once or more in the range of 80%. The fiber molded article of the present invention has excellent compression elasticity, flexibility, moisture permeability, and water permeability. Many fiber axis directions are arranged in parallel. For this purpose, the direction of the secondary compression treatment at the time of manufacturing the fiber molded body is set to a direction in which a compression action is applied at a use position, for example, a sitting position or a bed position, that is, a thickness direction of the use. In this case, unnecessary bonding points melt-bonded at R1 of the fiber A are removed in advance by the secondary compression treatment, and the soft feeling and the compression recovery property at the time of using the fiber molded body are improved.
[0055]
【Example】
Next, the present invention will be described more specifically with reference to examples. The measuring method of various characteristics described in the present invention is as follows.
[0056]
(1) Deflection amount
Prepare three rectangular mat material test pieces of width 10 cm, thickness 5 cm, and length 50 cm, put on a horizontal table, slide the test pieces and leave them 30 cm in length from the edge of the table for 1 minute Thereafter, the difference in height (bending amount mm) between the upper surface of the table and the lower surface of the tip of the test piece was read on a scale, and expressed as an average of three measurements.
[0057]
(2) insect repellency (mite repellent rate)
Spread the powder feed during mite propagation <Nippon Clea Co., Ltd. CF-2> as uniformly as possible on a petri dish with a diameter of 200 mm and a height of 30 mm. In addition, 1 g of ordinary polyester cotton, which has not been subjected to insect repellent treatment, was spread into an approximately 8 × 8 cm square in the same manner as described above, and placed one by one symmetrically. At a height of 1.4 cm at the center of the cotton, a container having a diameter of 2.8 cm containing 1 g of powdered feed (water 15%) containing no ticks was placed at room temperature 25 ± 2 ° C. and humidity 70 to 70 ° C. After being placed in an incubator adjusted to a range of 80% RH and allowed to stand for 40 hours, the number of mites invading the feed in the container was counted by a saline suspension method, and the mite repellent rate was calculated by the following formula.
[0058]
Tick repellent rate (%) = {(AB) / A} × 100
Here, A is the number of ticks of ordinary polyester cotton, and B is the number of ticks of the spread cotton of the fiber molded body.
[0059]
(3) Fineness
It measured according to the method of JIS L1015-7-51A.
[0060]
(4) Average fiber length <cut length>
It was measured according to JIS L 1015A method (staple diagram method).
(5) Number and degree of crimp
The number of crimps and the degree of crimp were measured according to the methods of JIS L1015-7-12-1 and JIS L1015-7-12-2.
[0061]
(6) Packing density
A test piece (vertical: 20 cm, horizontal: 20 cm, thickness: 20 cm) was allowed to stand in an atmosphere of 20 ° C. × 65% RH for 24 hours, and the weight (w) was measured and determined by the following equation.
Density (g / cm³) = W / 8000
[Examples 1-3 and Comparative Examples 1-2]
As the insect repellent polyester fiber A for the mat material of the bed mat, a chip of ordinary polyethylene terephthalate having a melting point of 255 ° C. was prepared by asymmetrically cooling the undrawn yarn at the spinneret outlet at a spinning temperature of 280 ° C. and a take-up speed of 1350 m / min. Spun.
[0062]
Next, the undrawn yarn was drawn at a drawing bath temperature of 80 ° C., and mechanically crimped with a crimper. Further, phenothrin as a pyrethroid compound is emulsified with 9 mol of a nonylphenol ethylene oxide additive so that the pyrethroid compound becomes 0.1% by weight, and the amino equivalent as a binder is 3.5 × 10 5³Aminosilicone (TK Silicone AS65, manufactured by Takamatsu Oil & Fats Co., Ltd.) having a gram equivalent / mole content of 0.5% by weight in terms of solid content was further added. The water emulsion composition adjusted to 0.15% by weight in terms of conversion is applied by spraying, cut into a cut length of 30 mm, heat-treated at 175 ° C., fineness 13 denier, number of crimps 4.5 / 25 mm. Insect repellent polyester fiber A having a circular hollow cross-sectional structure having a degree of crimp of 25.2% and a hollow ratio of 30% was obtained. The phenothrin adhesion amount of this fiber A was 0.15% by weight, the aminosilicone adhesion amount was 0.5% by weight, and the rust preventive agent adhesion amount was 0.15% by weight. The rust resistance of this staple 100% is that rust is almost generated even after iron wire plated with hydrochloric acid and oil-removed is wrapped in the cotton and left in a thermo-hygrostat at 25 ° C and 75% RH for 72 hours. The mite repellency was 99.4% before washing, and 94.1% after repeating the process of washing at 40 ° C. for 10 minutes three times with perclene solution.
[0063]
Separately, as the composite fiber C for mat middle material, R2 uses a normal polyethylene terephthalate chip having a melting point of 255 ° C., and R1 uses polyethylene terephthalate polyester having a melting point of 110 ° C. copolymerized with 40 mol% of isophthalic acid. Undrawn yarn of a concentric conjugate fiber C having a core of R2 and a sheath of R1 having a weight ratio of 50/50 represented by R1 / R2 at a spinning temperature of 285 ° C., a take-up speed of 1350 m / min. Was spun.
[0064]
Next, the undrawn yarn was drawn at a drawing bath temperature of 80 ° C., and mechanically crimped with a crimper. Further, after drying with a heat setter at 70 ° C., a finishing oil was applied and cut into a cut length of 51 mm to obtain a composite fiber C having a fineness of about 4 denier and a melting point of the surface layer of about 110 ° C.
[0065]
The fibers A and C were mixed at the mixing ratio shown in Table 1, further mixed and opened with a roller card, and the width of the inner surface where each surface was punched from the mold inlet as shown in FIG. The lower mold 3 having a length of 82 × 84 × 100 cm in length × length × depth was blown and filled together with an air flow. The blown fiber mixture 4 is compressed by an upper mold 2 having a punched surface, and a packing density of 0.04 g / cm.³And fixed at a thickness of 50 cm. The fiber mixture 4 filled in a mold and compressed was heat-set at 130 ° C. for 25 minutes using a heat setter used for setting a spun yarn to obtain a fiber molded body. Next, the perpendicular direction to the compression direction of the obtained fiber molded body was taken as a vertical direction (thickness direction), sliced to a thickness of 7 cm, and the sliced sheets were cut side by side, adhered to each other, The bed mat was 82 cm wide, 192 cm long and 7 cm thick.
[0066]
Further, as shown in Table 1, the middle materials of the bed mats of Examples 1 and 2 and Comparative Example 2 were subjected to a finish compression process five times at room temperature in a thickness direction at a compression ratio of 50% using a large hydraulic machine.
[0067]
Furthermore, as a cover (side material) of the bed mat, a double-sided circular knitted fabric using 75 denier false twisted yarn is sewn with a polyester spun sewing thread, and a polyester spun bond is used for a quality and handling label. Bed mat.
[0068]
When this bed mat was used for one year, the bed mats of Examples 1 to 3 had a deflection of 5.1 to 20 cm, followed the electric change of the gadget well, had good flexibility, and had good insect repellency (mites). The repellency rate), the handling property in washing and the like were good, and the water drainage property in washing was excellent, and the moisture permeability and water permeability were good and the feeling of use was comfortable.
[0069]
On the other hand, in Comparative Example 1, the bending amount was 4.6 cm, the bending property for gadget bedding was slightly poor, the sitting comfort in the sitting position was poor, and the insect repellency was also poor.
[0070]
Further, Comparative Example 2 has good flexibility and insect repellency, but has a bending amount of 23.1 cm, is slightly easily bent, and it is difficult to insert the mat material into the cover, and at the same time, the mat is moved by washing or the like. The handling was poor.
[0071]
After collecting the used bed mats of Examples 1 to 3, the fibers were defibrated by an anti-hair machine, and the opened fibers were melt-pelletized, melt-spun and stretched again to obtain 13 denier, 30 mm polyester staples. . The obtained staple was a slightly grayish polyester staple, which was slightly lower in strength than a commercially available normal polyester staple, but was sufficiently usable as a cotton wad.
[0072]
Table 1 shows the processing methods and properties of the materials in the bed mats of Examples 1 to 3 and Comparative Examples 1 and 2.
[0073]
[Example 4]
In Example 1, when the insect-resistant polyester fiber A is manufactured, the staples not subjected to the insect repellent treatment are used as the polyester fiber B, the polyester fiber A having the insect repellent effect is 40% by weight, the polyester fiber B not subjected to the insect repellent treatment is 20% by weight, and the conjugate fiber is used. A bed mat was prepared in the same manner as in Example 2 except that 40% by weight of C was mixed, and used for one year. The bed mat had good flexibility, insect repellency, handleability in washing and the like, was excellent in drainage in washing, had good moisture permeability and water permeability, and had a comfortable feeling of use.
[0074]
The used bed mat of Example 4 was collected and defibrated by an anti-hair machine, and then the opened fiber was melt-pelletized, melt-spun and drawn again to obtain a 13-denier, 30-mm polyester staple. The obtained staple was a slightly grayish polyester staple, which was slightly lower in strength than a commercially available normal polyester staple, but was sufficiently usable as a cotton wad.
[0075]
Table 1 shows the processing method and properties of the middle material of the bed mat of Example 4.
[0076]
[Table 1]

The repellent rate is a value for the mat material immediately after the bed mat is produced. L-0 is the case without dry washing, L-3 is the step of washing at 40 ° C. for 10 minutes with a perchlorene solution and removing the solvent three times. This is the value when it is repeated.
[0077]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it can be recycled efficiently, it has the flexibility required for medical beds, etc., it has an insect repellent effect that repels pests such as mites or suppresses the growth of pests, and its effect is high. It is possible to obtain a bed mat that is durable to dry cleaning, has high moisture permeability and water permeability, has a comfortable use feeling, and hardly causes environmental problems.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a block-shaped fiber molded product used in the present invention.
FIG. 2 is a longitudinal sectional view showing an example of an apparatus for producing a fiber molded body used in the present invention.
[Explanation of symbols]
1: Lower mold
2: Upper mold
3: Gas inlet
4: fiber mixture

Claims (12)

The mat material of the bed mat is a bed mat that is a fiber molded product containing at least insect-proofed polyester fiber A, and most of the constituent fibers of the mat material have a cross section (bdef) in the thickness direction of the mat material. And the fiber axis direction is arranged substantially in parallel, and arranged in a random direction within a cross section (bdef) in the thickness direction of the mat material, and the mat material has a deflection amount measured by the method described in the text. Characterized in that the bed mat material, the mat cover, and the cover thread constituting the bed mat are all made of polyester polymer fibers. 2. The easily recyclable bed mat according to claim 1, wherein the ratio of the polyester fiber A contained in the mat material of the bed mat is 40% by weight or more. The mat middle material of the bed mat is a fiber molded product containing a composite fiber C of polyester R2 and polyester R1 having a lower melting point than any of polyester fiber A and polyester R2. The easily recyclable bed mat according to claim 1 or 2, wherein at least a part of a contact point between the conjugate fiber C and the polyester fiber A is bonded and molded. The easily recyclable bed mat according to claim 3, wherein the composite fiber C contained in the mat material of the bed mat is a composite fiber having polyester R2 as a core component and polyester R1 as a sheath component. The easily recyclable bed mat according to claim 3 or 4, wherein the weight ratio of the composite fiber C represented by R1 / R2 is in the range of 20/80 to 60/40. The easily recyclable bed mat according to any one of claims 3 to 5, wherein the ratio of the composite fiber C contained in the mat material of the bed mat is 20% by weight or more and less than 60% by weight. The mat material of the bed mat is a fibrous molded product composed of two or more kinds of fibers. The easily recyclable bed mat according to any one of claims 1 to 6, which is a fibrous molded article containing less than 80% by weight in total of A. The easily recyclable bed mat according to any one of claims 1 to 7, wherein the polyester fiber A that has been subjected to insect repellent treatment is treated with a pyrethroid compound. Insect-proof polyester fiber A treated with a treatment liquid containing a pyrethroid compound, an aminosilicon having an amino equivalent of 4.5 × 10 ^{2 to} 6.5 × 10 ³ gram equivalent / mol, and a rust inhibitor. Wherein the weight ratio of the aminosilicon to the pyrethroid compound in the deposit on the fiber surface is 1: 1 to 1:20, and the weight ratio of the rust inhibitor to the pyrethroid compound is 1: 0.5 to 1 The easily recyclable bed mat according to any one of claims 1 to 8, wherein the adhesion amount of the pyrethroid compound is 0.01 to 1% by weight. The easily recyclable bed mat according to claim 9, wherein the rust inhibitor is a compound represented by the following general formula (1).

(Wherein, in the formula, R: an alkyl group of C _{2 to} C ₄ , Y ₁ : an alkyl group of C _{8 to} C ₁₈ or a — (CH ₂ ) n-COO group (n: 1 to 3), Y ₂ , Y _{3, Y 4 :-( CH 2)} n-COO group _{(n: 1~3), X 1} : shows H, a Na or K): No, H, Na or _{K, X 2, 2X 3,} X 4 The easily recyclable bed mat according to any one of claims 8 to 10, wherein the pyrethroid compound is phenothrin. The easily recyclable bed mat according to any one of claims 1 to 11, wherein a mites repellent rate defined in the text is 40% or more.

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