JP4769381B2

JP4769381B2 - Method for producing molded product made of fluororesin having through hole

Info

Publication number: JP4769381B2
Application number: JP2001223358A
Authority: JP
Inventors: 浩則畑津; 礼司原; 英司川崎
Original assignee: Chukoh Chemical Industries Ltd
Current assignee: Chukoh Chemical Industries Ltd
Priority date: 2001-07-24
Filing date: 2001-07-24
Publication date: 2011-09-07
Anticipated expiration: 2021-07-24
Also published as: JP2003033974A

Description

【０００１】
【発明の属する技術分野】
本発明は、特に練り製品等を自動的に作る食品成形、半導体などの薬液による洗浄、熱交換器、泡風呂等の分野で使用される貫通孔を有するフッ素樹脂製成形物の製造方法に関する。
【０００２】
【従来の技術】
周知の如く、例えば食品成形用機械では、練り状原料を所定の形状に成形するために貫通孔を有した成形物が使用されている。この場合、成形物には練り状原料を収容するための凹部が形成されており、この凹部から成形した原料を取り出すため成形物に凹部に連通した貫通穴が複数個形成されている。従って、成形物の凹部から練り状原料を取り出すときは、貫通穴を通して空気を凹部に送る操作を行う。
【０００３】
ところで、食品成形用機械においては、凹部に練り状原料を送るので、貫通穴の径があまり大きいと貫通穴まで練り状原料が入り込んで、空気を貫通穴に送っても練り状原料を貫通穴から取り出しにくく、目詰まりの原因となっている。そこで、貫通穴は、練り状原料が入り込まないようにできるだけ小さな径であることが好ましい。
【０００４】
従来、前記成形物は、四フッ化エチレン樹脂（ＰＴＦＥ）粉末を金型に充填して加圧成形した後、融点以上の温度で焼成したＰＴＦＥ樹脂製シートにドリル等を用いて機械加工を行なって、貫通孔を形成する方法が一般的に行われている。
【０００５】
ここで、ドリルにより細い孔を加工するためにはドリルの径を細くする必要がある。しかしながら、ドリルの径が細くなると次に述べるような問題が生じた。
１）ドリルの強度不足に起因して加工できる孔の深さに限界があり、例えばφ１ｍｍの孔径を得ようとすると、その深さは５０ｍｍ程度が限界である。
２）同じくドリルの強度不足に起因してドリルの先端が踊り、孔径寸法や孔の直線性といった精度が損なわれる。
３）ドリルで加工できる孔は直線的な孔のみであった。
４）φ１ｍｍ以下の細物ドリルは特注品となり、ドリルのコストが高くなる。
【０００６】
【発明が解決しようとする課題】
本発明は、こうした事情を考慮してなされたもので、金型内に非溶融タイプのフッ素樹脂製チューブをセットする工程と、前記金型内に前記チューブの大部分が埋まるようにフッ素樹脂粉末を充填する工程と、前記チューブ及び前記粉末を金型内で一体に成形する工程とを具備し、前記フッ素樹脂製チューブをセットする工程、前記フッ素樹脂粉末を充填する工程、及び前記チューブ及び前記粉末を一体に成形する工程を順次繰り返すことにより、孔を深く形成できるとともに、孔径寸法や孔の直線性の精度が得られ、かつ低コストの貫通孔を有するフッ素樹脂製成形物の製造方法を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明は、金型内に非溶融タイプのフッ素樹脂製チューブをセットする工程と、前記金型内に前記チューブが埋まるようにフッ素樹脂粉末を充填する工程と、前記チューブ及び前記粉末を金型内で一体に成形する工程とを具備し、前記フッ素樹脂製チューブをセットする工程、前記フッ素樹脂粉末を充填する工程、及び前記チューブ及び前記粉末を一体に成形する工程を順次繰り返すことを特徴とする貫通孔を有するフッ素樹脂製成形物の製造方法である。
【００１０】
【発明の実施の形態】
以下、本発明について更に詳細に説明する。
本発明において、前記フッ素樹脂としては、例えば四フッ化エチレン樹脂（ＰＴＦＥ）、四フッ化エチレンパーフロロアルキルビニールエーテル共重合樹脂（ＰＦＡ）、四フッ化エチレン−六フッ化プロピレン共重合樹脂（ＰＦＥＰ）、四フッ化エチレン−エチレン共重合樹脂（ＥＴＦＥ）、ポリビニリデンフロライド（ＰＤＶＦ）、ポリクロロトリフロロエチレン（ＰＣＴＦＥ）等が挙げられる。このうち、非溶融タイプのフッ素樹脂としては、四フッ化エチレン樹脂が好ましい。この理由は、この樹脂は熱可塑性樹脂でありながら溶融温度下であってもゲル状態の半固体となって流動せず、形状を維持する特性を有するからである。
【００１１】
本発明において、フッ素樹脂製チューブはストレートでもあるいは屈曲して配置してもよく、成形物を使用する用途に応じて適宜設定すればよい。例えば、食品成形に使用する場合は、異物がチューブ内（貫通孔内）の異物を取り出しやすいので、チューブはストレートが好ましい。また、前記チューブ内には、金属、セラミック等の棒を入れて成形物を製造してもよい。これにより、成型時にチューブが変形しにくいので、貫通孔の孔形状がより均一なチューブを得ることができる。なお、前記棒は、成形物を形成後チューブ内から取り出す必要があるので、棒はチューブの少なくとも片側の端面から突出するように予めセットすることが好ましい。
【００１２】
【実施例】
以下、本発明の実施例に係る貫通孔を有するフッ素樹脂製成形物及びその製法図面を参照して説明する。なお、下記実施例で述べる材料、数値等は一例を示すもので、本発明の権利範囲はこれらに限定されない。
【００１３】
（実施例１）
図１（Ａ），（Ｂ）及び図２を参照して説明する。
まず、図１（Ａ）に示すように箱型の金型１及び押え金型２を用意した。つづいて、変性ＰＴＦＥモールディング成形用パウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを取り、これを金型１に入れてへらで均一にならし、第１の樹脂層３を形成した。次いで、前記第１の樹脂層３上にφ０．２ｍｍ×φ０．７ｍｍのＰＴＦＥ樹脂製チューブ４を複数本金型１に入る長さに切って並べた。
【００１４】
次に、変性ＰＴＦＥモールディングパウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを取り、これを金型１に入れてへらで均一にならし、第２の樹脂層５を形成した（図１（Ａ）参照）。つづいて、第２の樹脂層５上に押え金型２を載せ、金型１ごと加圧プレスにセットして１０ＭＰａの圧力を掛けて成形し、予備成形品６を形成した（図１（Ｂ）参照）。
【００１５】
次に、押え金型２を外し、予備成形品６を金型１から取り出した後、パーフェクトオーブン（タバイエスペック社製）にて３７０℃で１４時間焼成し、図２に示すように貫通孔を有して成形品としての焼成品（成形品）７を製造した。
【００１６】
実施例１に係る成形品は、ＰＴＦＥ樹脂製の成形物本体９と、この成形物本体９に埋め込まれた複数のＰＴＦＥ樹脂製チューブ４とからなり、前記チューブ４の両端は前記成形物本体９の外側に露出してチューブ４の穴部分（貫通孔）４ａが開放された構成となっている。
【００１７】
実施例１によれば、以下に述べる効果を有する。
１）成形物本体９に埋め込むチューブ４の長さには特に制約がなく、チューブ４の両端を金型の両端に渡って配置することで、成形物本体９の両端に及ぶ貫通孔４ａが得られる。例えば、１ｍ幅×１ｍ長さ×１ｃｍ高さの成形物の幅方向両端面に達する貫通孔を得ることができる。
【００１８】
２）また、成形物に形成される孔径は、成形物本体９に埋め込まれるチューブ４の内径寸法そのものによって得られるので、チューブ４の内径寸法を選定することで、ＰＴＦＥ樹脂製成形物に形成する孔径を制御することが容易に精度よくできる。
【００１９】
３）更に、チューブを直線状にした場合の直線精度を高くできる。
４）埋め込むチューブの数は体積の許容範囲内で任意に配置することができるので、ＰＴＦＥ樹脂製成形物に形成する孔数を制御することができる。
５）従来の成形物と比較して、成形圧力を高くすることができるので、硬度や剛性、機械的強度の高いＰＴＦＥ樹脂製シートが得られる。
６）表面や孔内表面は表面粗度が密であるため、非粘着性を阻害しない。
【００２０】
（実施例２）
図３（Ａ）〜（Ｃ）及び図４を参照する。但し、図１及び図２と同部材は同符番を付して説明する。
【００２１】
まず、変性ＰＴＦＥモールディングパウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを取り、これを金型１に入れてへらで均一にならし、第１の樹脂層１３ａを形成した。次いで、前記第１の樹脂層１３ａ上にφ０．２ｍｍ×φ０．７ｍｍのＰＴＦＥ樹脂製チューブ４を複数本金型１に入る長さに切って並べた。これにより、第１のチューブ列が形成される。つづいて、前記第１の樹脂層１３ａ上に押え金型２を乗せ、金型１ごと加圧プレスにセットして０．６ＭＰａの圧力を掛けて仮成形をした（図３（Ａ）参照）。
【００２２】
次に、押え金型２を取り除き、第１の樹脂層１３ａの上に変性ＰＴＦＥモールディングパウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを入れ、これをへらで均一にならし、第２の樹脂層１３ｂを形成した。つづいて、前記第２の樹脂層１３ｂ上にφ０．２ｍｍ×φ０．７ｍｍのＰＴＦＥ樹脂製チューブ４を複数本金型１に入る長さに切って並べた。これにより、第２のチューブ列が形成される。更に、ここに押え金型２を乗せ、金型１ごと加圧プレスにセットして０．６ＭＰａの圧力を掛けて仮成形をした（図３（Ｂ）参照）。
【００２３】
次に、押え金型２を取り除き、第２の樹脂層１３ｂの上に変性ＰＴＦＥモールディングパウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを入れ、これをへらで均一にならし、第３の樹脂層１３ｃを形成した。つづいて、前記第２の樹脂層１３ｂ上にφ０．２ｍｍ×φ０．７ｍｍのＰＴＦＥ樹脂製チューブ４を複数本金型１に入る長さに切って並べた。これにより、第３のチューブ列が形成される。
【００２４】
更に、ＰＴＦＥモールディングパウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを入れ、これをへらで均一にならし、第４の樹脂層１３ｄを形成した。この後、ここに押え金型２を乗せ、金型１ごと加圧プレスにセットして１０ＭＰａの圧力を掛けて仮成形をし、予備成形品１６を製造した（図３（Ｃ）参照）。この後、押え金型２を外し、予備成形品１６を金型１から取り出した後、パーフェクトオーブン（タバイエスペック社製）にて３７０℃で１４時間焼成し、図４に示すように貫通孔を有して成形品としての焼成品（成形品）１７を製造した。
【００２５】
実施例２に係る成形品１７は、ＰＴＦＥ樹脂製の成形物本体１９と、この成形物本体１９に埋め込まれた複数のＰＴＦＥ樹脂製チューブ４とからなり、前記チューブ４の両端は成形物本体１９の外側に露出してチューブ４の穴部分４ａが開放された構成となっている。実施例２によれば、実施例１と同様な効果を有する。
【００２６】
（実施例３）
図５〜図１２を参照する。但し、図１、図２と同部材は同符番を付して説明を省略する。
本実施例３で使用される金型２１は、図５に示すように、升の底が抜けた形状をしており、埋設するＰＴＦＥチューブの外径より一回り小さな径を有した半割溝２２が金型上部の対面する縁に加工してある。また、前記金型２１の底部には、図示しない昇降治具により上下に昇降可能な別な金型（底板）２３が配置されている。この際、金型２１の縁の高さから底板２３の上面の高さを差し引いた高さがチューブ外径より高い位置になるように底板２３の高さを調整する。
【００２７】
まず、変性ＰＴＦＥモールディングパウダー（商品名：Ｍ１１２、ダイキン工業（株）製）１２０ｇを取り、これを底板２３の上部でかつ金型２１の内側に入れてヘラで均一にならし、第１の樹脂層１３ａを形成した。次いで、第１の樹脂層１３ａ上に、φ０．２ｍｍ×φ０．７ｍｍのＰＴＦＥ樹脂製チューブ４を、両端が前記金型２１の半割溝２２に架設するように複数本並べた。これにより、第１のチューブ列が形成された。
【００２８】
この際、各チューブ４の両端は金型２１の側面に沿わせ、チューブ４が真っ直ぐになるように引っ張りながら金型２１の側面に粘着テープ（図示せず）で固定した（図６参照）。
【００２９】
次に、金型２をこの上に載せて固定した（図７及び図８参照）。ここで、図７は金型及び樹脂層等の断面図、図８は図７の上面図を示す。つづいて、前記底板２３を第１の樹脂層１３ａを圧縮する方向（上方）に上昇させて、０．６ＭＰａの圧力を掛けて仮成形をした（図９参照）。この際、圧力を掛けた状態で金型２１に沿ってカッターナイフでチューブをカットし、金型２１の側面に粘着テープで固定したチューブ端部は取り除いた。
【００３０】
次に、底板２３の圧力を解除した後、金型２を取り外し、押し型２４を第１の樹脂層１３ａに押し当てながら昇降機構を操作して底板２３を下降させ、第１の樹脂層１３ａを下降させた（図１０参照）。この一連の操作を３回繰り返し行い、第１〜第３の樹脂層を仮成形した後、更にチューブを埋設しない第４の樹脂層１３ｄを仮成形した（図１１参照）。つづいて、仮成形した後、金型２１、底板２３、押し型２４を組んだ状態で加圧プレスにセットして１０ＭＰａの圧力をかけて本成形した(図１１参照)。更に、金型から取り出してパーフェクトオーブン（タバイエスペック社製）にて３７０℃で１４時間焼成し、図１３に示すように貫通孔を有して成形品としての焼成品（成形品）を製造した。
【００３１】
実施例３に係る成形品は、ＰＴＦＥ樹脂製の成形物本体２９と、この成形物本体２９に多数段に埋め込まれた複数のＰＴＦＥ樹脂製チューブ４とからなり、前記チューブ４の両端は成形物本体２９の外側に露出してチューブ４の穴部分４ａが開放された構成となっている。実施例３によれば、実施例１と同様な効果を有する。
【００３２】
（実施例４）
上記実施例３の手順で下記表１に示す変成ＰＴＦＥ製の成形物（Ｎｏ．１〜Ｎｏ．６）を製作した。但し、成形物の幅、長さ、高さ、チューブの配置は図１３に示すとおりである。
【００３３】
【表１】

【００３４】
（比較例１）
融点以上の温度で焼成したＰＴＦＥ樹脂粉末を粉砕したプレシンター樹脂を、未焼成のＰＴＦＥ樹脂粉末に混合して金型に充填した後、加圧成型し、融点以上の温度で焼成してＰＴＦＥ製多孔質体（成形物）を製造した。図１６は、比較例１によるＰＴＦＥ製多孔質体の気孔直径（Å：オングストローム）と気孔容積（％）との関係を示す特性図を示す。
【００３５】
（比較例２）
ＰＴＦＥ樹脂粉末に炭酸アンモニウム、アクリル、ナフタリン粉末等の昇華性粒子を気孔形成剤として混合し、金型に充填した後、加圧成型して気孔形成剤の昇華温度以上に加熱して気孔形成剤を除去し、更に融点以上の温度で焼成してＰＴＦＥ製多孔質体（成形物）を製造した。図１７は、比較例２によるＰＴＦＥ製多孔質体の気孔直径（μｍ）と累積気孔容積（％）との関係を示す特性図を示す。
【００３６】
上記実施例４のＮｏ．１〜Ｎｏ．６の成形物と比較例１，２の成形物の特性（表面粗度、表面硬度、流量、引張り強さ、引張り伸び、バブルリング）を比較した。下記表２、表３、表４、表５、表６は、夫々表面粗度、表面硬度、流量、引張り強さ、引張り伸びを示す。
【００３７】
【表２】

【００３８】
【表３】

【００３９】
【表４】

【００４０】
【表５】

【００４１】
【表６】

【００４２】
但し、バブリング状況は、比較例１，２の場合はエアー圧力が高くなると（エアー流量が増すと）、隣り合った気泡同士が一体となって泡が大きくなるのに対し、実施例４のＮｏ．１〜Ｎｏ．６の場合はエアー流量が増しても隣り合った気泡同士が一体とならず独立しており安定している事が確認できた。また、チューブ径に応じて気泡の大きさが制御される。
【００４３】
なお、上記実施例では、成形物本体に形成された貫通孔が総て同じ径である場合について述べたが、これに限らない。例えば、図１４に示すように、貫通孔３１が成形物本体２９に放射状で且つ中心から外側に向うに連れて径が大きくなるような構成のものでもよい。また、図１５に示すように、貫通孔３２が格子状で、かつ貫通孔３２が内側から外側に向うに連れて径が大きくなる第１の穴列と、貫通孔３２が外側から内側に向うに連れて径が小さくなる第２の穴列のものを交互に配置した構成ものでもよい。更に、上記実施例では、チューブがストレートの場合について述べたが、これに限らず、カーブを描いた曲線状に埋め込んでもよく、この場合貫通孔の入口と出口を任意の場所に設けることができる。
【００４４】
【発明の効果】
以上詳述したように本発明によれば、フッ素樹脂製成形物本体と、この成形物本体に埋め込まれた複数の非溶融タイプのフッ素樹脂製チューブとを具備し、前記チューブの両端は前記成形物本体の外側に露出してチューブの穴部分が開放された構成とすることにより、従来と比べ孔を深く形成できるとともに、孔径寸法や孔の直線性の精度が得られる低コストの貫通孔を有するフッ素樹脂製成形物を提供できる。
【００４５】
また、本発明によれば、金型内に非溶融タイプのフッ素樹脂製チューブをセットする工程と、前記金型内に前記チューブの大部分が埋まるようにフッ素樹脂粉末を充填する工程と、前記チューブ及び前記粉末を金型内で一体に成形する工程とを具備した構成にすることにより、上記と同様、孔を深く形成できるとともに、孔径寸法や孔の直線性の精度が得られ、かつ低コストの貫通孔を有するフッ素樹脂製成形物の製造方法を提供できる。
【図面の簡単な説明】
【図１】図１は、本発明の実施例１に係るフッ素樹脂製成形物の製造方法を工程順に示す断面図。
【図２】図２は、実施例１に係るフッ素樹脂成形物の斜視図。
【図３】図３は、本発明の実施例２に係るフッ素樹脂製成形物の製造方法を工程順に示す断面図。
【図４】図４は、実施例２に係るフッ素樹脂成形物の斜視図。
【図５】図５は、実施例３に係るフッ素樹脂製成形物の製造方法に使用される金型及び底板の説明図。
【図６】図６は、実施例３に係るフッ素樹脂製成形物の製造方法の一工程の説明図で、第１のチューブ列を配置するまでの説明図。
【図７】図７は、実施例３に係るフッ素樹脂製成形物の製造方法の一工程の説明図で、金型を第１のチューブ列を含む第１の樹脂層上にセットするまでの説明図。
【図８】図８は、図７の平面図。
【図９】図９は、実施例３に係るフッ素樹脂製成形物の製造方法の一工程の説明図で、金型を第１のチューブ列を含む第１の樹脂層上にセットするまでの説明図。
【図１０】実施例３に係るフッ素樹脂製成形物の製造方法の一工程の説明図で、押し型を第１のチューブ列を含む第１の樹脂層上にセットするまでの説明図。
【図１１】実施例３に係るフッ素樹脂製成形物の製造方法の一工程の説明図で、押し型を第４の樹脂層上にセットするまでの説明図。
【図１２】実施例３に係るフッ素樹脂製成形物の製造方法の最終工程の説明図。
【図１３】本発明に係るフッ素樹脂製成形物の斜視図。
【図１４】本発明に係るフッ素樹脂製成形物の他の説明図。
【図１５】本発明に係るフッ素樹脂製成形物の更に他の説明図。
【図１６】比較例１によるＰＴＦＥ製多孔質体の貫通孔の直径（Ａ）と体積（％）との関係を示す特性図。
【図１７】比較例２によるＰＴＦＥ製多孔質体の機構直径（μｍ）と累積気孔容積（％）との関係を示す特性図。
【符号の説明】
１，２１…金型、
２…押え金型、
３，５，１３ａ，１３ｂ，１３ｃ，１３ｄ…樹脂層、
４…チューブ、
４ａ…貫通孔、
６…予備成形品、
７…焼成品（成形品）、
２２…半割溝、
２３…底板、
２４…押し型、
２９…成形物本体、
３１，３２…貫通孔。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a process for producing a molded product made of fluororesin having a through-hole used particularly in the fields of food molding for automatically producing a kneaded product, cleaning with a chemical solution such as a semiconductor, heat exchanger, bubble bath and the like.
[0002]
[Prior art]
As is well known, for example, in a food molding machine, a molded product having a through hole is used to mold a kneaded raw material into a predetermined shape. In this case, the molded product is formed with a recess for accommodating the kneaded raw material, and a plurality of through-holes communicating with the recess are formed in the molded product to take out the molded material from the recess. Therefore, when taking out the kneaded raw material from the concave portion of the molded product, an operation of sending air to the concave portion through the through hole is performed.
[0003]
By the way, in the food molding machine, since the kneaded raw material is sent to the recess, if the diameter of the through hole is too large, the kneaded raw material enters the through hole, and even if air is sent to the through hole, It is difficult to remove it from the camera, causing clogging. Therefore, the through hole preferably has a diameter as small as possible so that the kneaded raw material does not enter.
[0004]
Conventionally, the molded product is machined by using a drill or the like on a PTFE resin sheet fired at a temperature equal to or higher than the melting point after filling the mold with a tetrafluoroethylene resin (PTFE) powder and press-molding it. Thus, a method of forming a through hole is generally performed.
[0005]
Here, in order to process a thin hole with a drill, it is necessary to reduce the diameter of the drill. However, when the diameter of the drill is reduced, the following problems occur.
1) There is a limit to the depth of a hole that can be processed due to insufficient strength of the drill. For example, when trying to obtain a hole diameter of φ1 mm, the depth is about 50 mm.
2) Similarly, due to insufficient strength of the drill, the tip of the drill dances and accuracy such as hole diameter and hole linearity is impaired.
3) The only holes that could be drilled were straight holes.
4) A drill with a diameter of 1 mm or less is a special order product, which increases the cost of the drill.
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and includes a step of setting a non-melting type fluororesin tube in a mold, and a fluororesin powder so that most of the tube is embedded in the mold. And the step of integrally molding the tube and the powder in a mold, the step of setting the fluororesin tube, the step of filling the fluororesin powder, the tube and the A method for producing a fluororesin molded product that can form holes deeply by repeating the steps of integrally molding the powder , and that can obtain hole diameter dimensions and hole linearity accuracy, and has low-cost through holes. The purpose is to provide.
[0008]
[Means for Solving the Problems]
The present invention includes a step of setting a non-melting type fluororesin tube in a mold, a step of filling a fluororesin powder so that the tube is embedded in the mold, and the tube and the powder as a mold. A step of setting the fluororesin tube, a step of filling the fluororesin powder, and a step of integrally molding the tube and the powder. It is a manufacturing method of the fluororesin molding which has a through-hole which carries out .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail.
In the present invention, examples of the fluororesin include tetrafluoroethylene resin (PTFE), tetrafluoroethylene perfluoroalkyl vinyl ether copolymer resin (PFA), and tetrafluoroethylene-hexafluoropropylene copolymer resin (PFEP). ), Tetrafluoroethylene-ethylene copolymer resin (ETFE), polyvinylidene fluoride (PDVF), polychlorotrifluoroethylene (PCTFE), and the like. Among these, as the non-melting type fluororesin, a tetrafluoroethylene resin is preferable. This is because this resin is a thermoplastic resin and has a characteristic of maintaining a shape without being a gel-like semi-solid even at a melting temperature.
[0011]
In the present invention, the fluororesin tube may be arranged straight or bent, and may be appropriately set according to the use of the molded product. For example, when used for food molding, the tube is preferably straight because the foreign matter easily takes out the foreign matter in the tube (through hole). Moreover, you may manufacture a molded article by putting rods, such as a metal and a ceramic, in the said tube. Thereby, since a tube is hard to deform | transform at the time of shaping | molding, the tube with a more uniform hole shape of a through-hole can be obtained. In addition, since it is necessary to take out the said rod from the inside of a tube after forming a molded object, it is preferable to set beforehand a rod so that it may protrude from the end surface of the at least one side of a tube.
[0012]
【Example】
Hereinafter, the fluororesin molding which has a through-hole which concerns on the Example of this invention, and its manufacturing method are demonstrated with reference to. Note that the materials, numerical values, and the like described in the following examples are merely examples, and the scope of rights of the present invention is not limited thereto.
[0013]
Example 1
This will be described with reference to FIGS. 1 (A), 1 (B) and FIG.
First, as shown in FIG. 1A, a box-shaped mold 1 and a presser mold 2 were prepared. Subsequently, 120 g of modified PTFE molding molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) was taken and placed in a mold 1 and evenly distributed with a spatula to form the first resin layer 3. . Subsequently, a PTFE resin tube 4 having a diameter of 0.2 mm × 0.7 mm was cut on the first resin layer 3 so as to be cut into a length capable of entering the plurality of molds 1.
[0014]
Next, 120 g of modified PTFE molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) was taken and placed in the mold 1 and evenly spread with a spatula to form the second resin layer 5 (see FIG. 1 (A)). Subsequently, the presser mold 2 was placed on the second resin layer 5, and the mold 1 was set in a pressure press and molded by applying a pressure of 10 MPa to form a preform 6 (FIG. 1 (B )reference).
[0015]
Next, after removing the presser mold 2 and taking out the preformed product 6 from the mold 1, it is baked at 370 ° C. for 14 hours in a perfect oven (manufactured by Tabay Espec Co., Ltd.). A fired product (molded product) 7 was produced as a molded product.
[0016]
The molded product according to Example 1 includes a molded body 9 made of PTFE resin and a plurality of PTFE resin tubes 4 embedded in the molded body 9, and both ends of the tube 4 are the molded body 9. The hole part (through-hole) 4a of the tube 4 is exposed and exposed to the outside.
[0017]
The first embodiment has the following effects.
1) The length of the tube 4 embedded in the molded body 9 is not particularly limited, and the through holes 4a extending to both ends of the molded body 9 are obtained by arranging both ends of the tube 4 over both ends of the mold. It is done. For example, it is possible to obtain through-holes that reach both end faces in the width direction of a molded product having a width of 1 m × 1 m length × 1 cm.
[0018]
2) Moreover, since the hole diameter formed in the molded article is obtained by the inner diameter dimension of the tube 4 embedded in the molded body 9 itself, it is formed in the PTFE resin molded article by selecting the inner diameter dimension of the tube 4. The hole diameter can be easily and accurately controlled.
[0019]
3) Furthermore, the linear accuracy when the tube is linear can be increased.
4) Since the number of tubes to be embedded can be arbitrarily arranged within the allowable range of the volume, the number of holes formed in the PTFE resin molded product can be controlled.
5) Since the molding pressure can be increased as compared with a conventional molded product, a PTFE resin sheet having high hardness, rigidity and mechanical strength can be obtained.
6) Since the surface and the surface in the hole have a dense surface roughness, they do not hinder non-adhesiveness.
[0020]
(Example 2)
Please refer to FIGS. 3A to 3C and FIG. However, the same members as those in FIGS. 1 and 2 are described with the same reference numerals.
[0021]
First, 120 g of modified PTFE molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) was taken and placed in a mold 1 and evenly spread with a spatula to form a first resin layer 13a. Next, a plurality of PTFE resin tubes 4 having a diameter of φ0.2 mm × φ0.7 mm were cut and arranged on the first resin layer 13 a so as to fit into the mold 1. Thereby, the 1st tube row is formed. Subsequently, the presser mold 2 was placed on the first resin layer 13a, and the mold 1 was set in a pressure press and subjected to temporary molding by applying a pressure of 0.6 MPa (see FIG. 3A). .
[0022]
Next, the presser mold 2 is removed, and 120 g of modified PTFE molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) is placed on the first resin layer 13a. Two resin layers 13b were formed. Subsequently, a plurality of PTFE resin tubes 4 having a diameter of φ0.2 mm × φ0.7 mm were cut and arranged on the second resin layer 13 b so as to fit into the mold 1. Thereby, a second tube row is formed. Further, the presser mold 2 was placed here, and the mold 1 was set in a pressure press and subjected to temporary molding by applying a pressure of 0.6 MPa (see FIG. 3B).
[0023]
Next, the presser mold 2 is removed, and 120 g of modified PTFE molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) is put on the second resin layer 13b. 3 resin layers 13c were formed. Subsequently, a plurality of PTFE resin tubes 4 having a diameter of φ0.2 mm × φ0.7 mm were cut and arranged on the second resin layer 13 b so as to fit into the mold 1. Thereby, a third tube row is formed.
[0024]
Furthermore, 120 g of PTFE molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) was added, and this was evenly distributed with a spatula to form a fourth resin layer 13d. Thereafter, the presser mold 2 was placed thereon, and the mold 1 was set in a pressure press and subjected to temporary molding by applying a pressure of 10 MPa to produce a preform 16 (see FIG. 3C). Thereafter, the presser mold 2 is removed, and the preform 16 is taken out from the mold 1 and then fired at 370 ° C. for 14 hours in a perfect oven (manufactured by Tabay Espec Co., Ltd.). As shown in FIG. A fired product (molded product) 17 as a molded product was produced.
[0025]
A molded article 17 according to the second embodiment includes a molded body 19 made of PTFE resin and a plurality of PTFE resin tubes 4 embedded in the molded body 19, and both ends of the tube 4 are molded body 19. The hole portion 4a of the tube 4 is exposed and exposed to the outside of the tube. The second embodiment has the same effect as the first embodiment.
[0026]
(Example 3)
Please refer to FIG. However, the same members as those in FIG. 1 and FIG.
As shown in FIG. 5, the mold 21 used in the third embodiment has a shape in which the bottom of the rod is removed, and has a half groove having a diameter slightly smaller than the outer diameter of the PTFE tube to be embedded. 22 is machined into the facing edge of the upper part of the mold. Further, another mold (bottom plate) 23 that can be moved up and down by a lifting jig (not shown) is disposed at the bottom of the mold 21. At this time, the height of the bottom plate 23 is adjusted so that the height obtained by subtracting the height of the upper surface of the bottom plate 23 from the height of the edge of the mold 21 is higher than the outer diameter of the tube.
[0027]
First, 120 g of modified PTFE molding powder (trade name: M112, manufactured by Daikin Industries, Ltd.) is taken, placed in the upper part of the bottom plate 23 and inside the mold 21, and evenly distributed with a spatula. Layer 13a was formed. Subsequently, a plurality of PTFE resin tubes 4 of φ0.2 mm × φ0.7 mm were arranged on the first resin layer 13 a so that both ends were constructed in the half groove 22 of the mold 21. Thereby, the 1st tube row was formed.
[0028]
At this time, both ends of each tube 4 were aligned with the side surface of the mold 21 and fixed to the side surface of the mold 21 with an adhesive tape (not shown) while pulling so that the tube 4 was straight (see FIG. 6).
[0029]
Next, the mold 2 was placed thereon and fixed (see FIGS. 7 and 8). Here, FIG. 7 is a cross-sectional view of a mold and a resin layer, and FIG. 8 is a top view of FIG. Subsequently, the bottom plate 23 was raised in the direction of compressing the first resin layer 13a (upward), and was temporarily molded by applying a pressure of 0.6 MPa (see FIG. 9). Under the present circumstances, the tube was cut with the cutter knife along the metal mold | die 21 in the state which applied the pressure, and the tube edge part fixed to the side surface of the metal mold | die 21 with the adhesive tape was removed.
[0030]
Next, after releasing the pressure of the bottom plate 23, the mold 2 is removed, and the bottom plate 23 is moved down by operating the lifting mechanism while pressing the pressing die 24 against the first resin layer 13a, and the first resin layer 13a. Was lowered (see FIG. 10). This series of operations was repeated three times, and after the first to third resin layers were temporarily molded, a fourth resin layer 13d without a tube embedded therein was further temporarily molded (see FIG. 11). Subsequently, after temporary molding, the mold 21, the bottom plate 23, and the pressing mold 24 were assembled and set in a pressure press, and main molding was performed by applying a pressure of 10 MPa (see FIG. 11). Further, it was taken out from the mold and baked at 370 ° C. for 14 hours in a perfect oven (manufactured by Tabai Espec) to produce a baked product (molded product) having a through hole as shown in FIG. .
[0031]
The molded product according to Example 3 includes a molded body 29 made of PTFE resin and a plurality of PTFE resin tubes 4 embedded in the molded body 29 in multiple stages, and both ends of the tube 4 are molded products. The hole portion 4a of the tube 4 is exposed and exposed to the outside of the main body 29. The third embodiment has the same effect as the first embodiment.
[0032]
Example 4
The modified PTFE molded articles (No. 1 to No. 6) shown in Table 1 below were produced according to the procedure of Example 3. However, the width, length, height, and tube arrangement of the molded product are as shown in FIG.
[0033]
[Table 1]

[0034]
(Comparative Example 1)
A presinter resin obtained by pulverizing PTFE resin powder fired at a temperature higher than the melting point is mixed with unfired PTFE resin powder, filled in a mold, pressure-molded, fired at a temperature higher than the melting point, and made of PTFE porous material. A compact (molded product) was produced. FIG. 16 is a characteristic diagram showing the relationship between the pore diameter (Å: angstrom) and the pore volume (%) of the porous PTFE material according to Comparative Example 1.
[0035]
(Comparative Example 2)
After mixing sublimable particles such as ammonium carbonate, acrylic and naphthalene powder as a pore-forming agent with PTFE resin powder, filling the mold, press molding and heating above the sublimation temperature of the pore-forming agent, the pore-forming agent Was removed, and further fired at a temperature equal to or higher than the melting point to produce a PTFE porous body (molded product). FIG. 17 is a characteristic diagram showing the relationship between the pore diameter (μm) and the cumulative pore volume (%) of the porous PTFE material according to Comparative Example 2.
[0036]
No. in Example 4 above. 1-No. The properties (surface roughness, surface hardness, flow rate, tensile strength, tensile elongation, bubble ring) of the molded product of 6 and the molded products of Comparative Examples 1 and 2 were compared. Table 2, Table 3, Table 4, Table 5, and Table 6 below show surface roughness, surface hardness, flow rate, tensile strength, and tensile elongation, respectively.
[0037]
[Table 2]

[0038]
[Table 3]

[0039]
[Table 4]

[0040]
[Table 5]

[0041]
[Table 6]

[0042]
However, in the case of Comparative Examples 1 and 2, when the air pressure was increased (when the air flow rate was increased), the bubbling situation was such that adjacent bubbles were united and the bubbles increased, whereas No. of Example 4 . 1-No. In the case of 6, it was confirmed that even if the air flow rate was increased, adjacent bubbles were not integrated but were independent and stable. Further, the size of the bubbles is controlled according to the tube diameter.
[0043]
In addition, although the said Example demonstrated the case where all the through-holes formed in the molded object main body were the same diameters, it is not restricted to this. For example, as shown in FIG. 14, the structure may be such that the through holes 31 are radially formed on the molded body 29 and the diameter increases from the center toward the outside. Further, as shown in FIG. 15, the first hole row in which the through holes 32 are in a lattice shape and the diameter increases as the through holes 32 face from the inside to the outside, and the through holes 32 face from the outside to the inside. The configuration may be such that the second hole rows whose diameters become smaller as they go along are alternately arranged. Furthermore, in the above-described embodiment, the case where the tube is straight has been described. However, the present invention is not limited to this, and the tube may be embedded in a curved shape. In this case, the inlet and outlet of the through hole can be provided at arbitrary positions. .
[0044]
【The invention's effect】
As described above in detail, according to the present invention, a fluororesin molded product body and a plurality of non-melting type fluororesin tubes embedded in the molded product body are provided, and both ends of the tube are formed by the molding. By adopting a configuration in which the hole portion of the tube is exposed outside the object body, the hole can be formed deeper than before, and a low-cost through-hole that can obtain the accuracy of the hole diameter and the straightness of the hole can be obtained. The fluororesin molding which has can be provided.
[0045]
Further, according to the present invention, a step of setting a non-melting type fluororesin tube in a mold, a step of filling a fluororesin powder so that most of the tube is embedded in the mold, By forming the tube and the powder in a mold integrally with each other, the hole can be formed deeply as described above, and the hole diameter dimension and hole linearity accuracy can be obtained and low. The manufacturing method of the fluororesin molding which has a through-hole of cost can be provided.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a cross-sectional view showing a method for producing a fluororesin molded product according to Example 1 of the present invention in the order of steps.
FIG. 2 is a perspective view of a fluororesin molded product according to Example 1. FIG.
FIG. 3 is a cross-sectional view showing a method of manufacturing a fluororesin molded product according to Example 2 of the present invention in the order of steps.
FIG. 4 is a perspective view of a fluororesin molded product according to Example 2. FIG.
FIG. 5 is an explanatory view of a mold and a bottom plate used in the method for producing a fluororesin molded product according to Example 3.
FIG. 6 is an explanatory view of one step of the method for manufacturing a fluororesin molded product according to Example 3, up to the placement of the first tube row.
FIG. 7 is an explanatory view of one step of the method for producing a fluororesin molded product according to Example 3, until the mold is set on the first resin layer including the first tube row; Illustration.
FIG. 8 is a plan view of FIG. 7;
FIG. 9 is an explanatory view of one step of the method for producing a fluororesin molded product according to Example 3, until the mold is set on the first resin layer including the first tube row; Illustration.
FIG. 10 is an explanatory view of one step of a method for producing a fluororesin molded product according to Example 3, up to setting the pressing die on the first resin layer including the first tube row.
FIG. 11 is an explanatory view of one step of a method for producing a fluororesin molded product according to Example 3, up to setting a pressing die on a fourth resin layer.
12 is an explanatory view of a final step of a method for manufacturing a fluororesin molded product according to Example 3. FIG.
FIG. 13 is a perspective view of a fluororesin molded product according to the present invention.
FIG. 14 is another explanatory diagram of a fluororesin molded product according to the present invention.
FIG. 15 is still another explanatory view of a fluororesin molded product according to the present invention.
16 is a characteristic diagram showing the relationship between the diameter (A) and the volume (%) of the through hole of the PTFE porous body according to Comparative Example 1. FIG.
17 is a characteristic diagram showing the relationship between the mechanism diameter (μm) and the cumulative pore volume (%) of a PTFE porous material according to Comparative Example 2. FIG.
[Explanation of symbols]
1, 21 ... Mold,
2 ... Presser mold,
3, 5, 13a, 13b, 13c, 13d ... resin layer,
4 ... Tube,
4a ... through hole,
6 ... preformed product,
7 ... Firing product (molded product),
22 ... Half groove,
23 ... bottom plate,
24 ... Push type,
29 ... the molded body,
31, 32 ... through holes.

Claims

A step of setting a non-melting type fluororesin tube in the mold, a step of filling a fluororesin powder so that the tube is embedded in the mold, and the tube and the powder are integrated in the mold Forming a process,
A process for setting a fluororesin tube, a step of filling the fluororesin powder, and a step of integrally molding the tube and the powder are sequentially repeated. Method.

The method for producing a molded product made of fluororesin having a through hole according to claim 1, wherein the non-melting type fluororesin is a tetrafluoroethylene resin.