JPH02214647A - Manufacture of ultra-high-molecular weight polyethylene porous material - Google Patents
Manufacture of ultra-high-molecular weight polyethylene porous materialInfo
- Publication number
- JPH02214647A JPH02214647A JP3454689A JP3454689A JPH02214647A JP H02214647 A JPH02214647 A JP H02214647A JP 3454689 A JP3454689 A JP 3454689A JP 3454689 A JP3454689 A JP 3454689A JP H02214647 A JPH02214647 A JP H02214647A
- Authority
- JP
- Japan
- Prior art keywords
- uhpe
- mold
- molded product
- powder
- melting point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 title claims abstract description 7
- 239000011148 porous material Substances 0.000 title abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 22
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 239000004698 Polyethylene Substances 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 8
- -1 polyethylene Polymers 0.000 claims description 8
- 229920000573 polyethylene Polymers 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 abstract description 29
- 238000010438 heat treatment Methods 0.000 abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 12
- 238000007796 conventional method Methods 0.000 description 4
- 238000007872 degassing Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009770 conventional sintering Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1638—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate
- B01D39/1653—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin
- B01D39/1661—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin sintered or bonded
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は超高分子量ポリエチレン（以下、ＵＨＰＥと称
す）から成る多孔質体の製造法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for producing a porous body made of ultra-high molecular weight polyethylene (hereinafter referred to as UHPE).
（従来の技術）
ＵＨＰＥは一般のポリエチレンの分子量が約１０万以下
であるのに対し、約５０万以上（粘度法による測定値）
の高分子量を有する点で特異である。(Prior art) UHPE has a molecular weight of about 500,000 or more (measured value by viscosity method), whereas general polyethylene has a molecular weight of about 100,000 or less.
It is unique in that it has a high molecular weight.
そして、ＵＨＰＥ成形品は種々の分野に使用され、その
多孔質体も例えば、滑りシート、冷蔵庫用調湿フィルタ
ー、平面アンテナ用誘電体等に用いられている。UHPE molded products are used in various fields, and their porous bodies are also used, for example, in sliding sheets, humidity control filters for refrigerators, dielectric materials for planar antennas, and the like.
このよりなＵＨＰＥ多孔質体の製造法としては、ＵＨＰ
Ｅ粉末を金型に充填し、この粉末を所定圧力で加圧し、
次いでＵＨＰＥの融点以上に温度維持された加熱炉中で
焼結した後冷却して金型から取り出すことによりブロッ
ク状多孔質体を得、その後これを所定厚さに切削してシ
ート状とする方法が知られている。As a method for manufacturing this tighter UHPE porous material, UHP
Fill a mold with E powder, pressurize this powder with a predetermined pressure,
Next, the block-shaped porous body is obtained by sintering it in a heating furnace whose temperature is maintained at a temperature higher than the melting point of UHPE, and then cooling and taking it out from the mold, which is then cut to a predetermined thickness to form a sheet. It has been known.
しかしながら、上記従来法によって得られるブロック状
多孔質体は外周部近傍では比重（見かけ比重）が高く（
多孔質化の度合が低い）、中心部では比重が低い（多孔
質化の度合が高い）もので、多孔質構造が不均一である
。However, the block-shaped porous material obtained by the above conventional method has a high specific gravity (apparent specific gravity) near the outer periphery (
The specific gravity is low in the center (high degree of porosity), and the porous structure is non-uniform.
従って、このブロック状多孔質体忙その外周部から順次
切削して得られるシート状多孔質体も、切削初めの部分
では比重が高く、切削路りに近づくにつれて比重が低い
という不均一多孔質構造となるのが不可避である。Therefore, the sheet-like porous material obtained by sequentially cutting the block-like porous material from its outer periphery also has a non-uniform porous structure in which the specific gravity is high at the beginning of cutting and the specific gravity is low as it approaches the cutting path. It is inevitable that
従来法によって得られる多孔質体の比重のバラツキ（多
孔質構造の不均一さ）は、金型内での焼結工程における
熱伝導の不均一さがその主因と推定される。It is assumed that the main cause of the variation in specific gravity (non-uniformity of porous structure) of the porous body obtained by the conventional method is non-uniformity of heat conduction during the sintering process within the mold.
即ち、従来法の焼結工程において熱は金型壁を通してＵ
ＨＰＥ粉末に伝達されるので、金型壁面近傍の粉末は短
時間で溶融状態となり、一方、金型壁面からの距離が大
きくなるにつれて熱伝導の遅さのために溶融状態に到達
し難くなる。このため金型壁面近傍においては粉末と粉
末の融着状態が密となって比重が高くなり、金型壁面か
ら離れるにつれて粉末と粉末の融着状態が粗となって比
重が低くなるのである。That is, in the conventional sintering process, heat is transferred through the mold wall to U.
As the heat is transferred to the HPE powder, the powder near the mold wall becomes molten in a short time, while as the distance from the mold wall increases, it becomes difficult to reach the molten state due to slow heat conduction. Therefore, near the mold wall, the powders are closely fused and the specific gravity becomes high, and as they move away from the mold wall, the fusion between the powders becomes rougher and the specific gravity becomes lower.
（発明が解決しようとする課題）
従って、本発明は多孔質構造の均一なＵＨＰＥ多孔質多
孔装体し得る方法を提供することを目的とする。(Problems to be Solved by the Invention) Therefore, an object of the present invention is to provide a method for producing a UHPE porous packaging having a uniform porous structure.
（課題を解決するための手段）
本発明者は従来技術の有する上記問題を解決するため種
々検討の結果、金型内に充填した粉末を加圧するのに先
立ち、特定温度よりも低温で加熱を行なうこと、焼結前
に脱気を行なうことおよび焼結を加熱水蒸気中で行なう
こと、を実行することにより、環内は明らかではないが
、比重のバラツキの少ない均質な多孔質体が得られるこ
とを見出し、本発明を完成するに至った。(Means for Solving the Problem) As a result of various studies in order to solve the above-mentioned problems of the prior art, the present inventor has found that, prior to pressurizing the powder filled in the mold, the powder is heated at a temperature lower than a specific temperature. By performing the following steps, degassing before sintering, and sintering in heated steam, a homogeneous porous body with little variation in specific gravity can be obtained, although the inside of the ring is not clear. This discovery led to the completion of the present invention.
即ち、本発明に係るＵＨＰＥ多孔質多孔装体法はＵＨＰ
Ｅ粉末金金型に充填し、該ポリエチレンの融点よりも低
い温度で加熱した後加圧することにより予備成形物を得
、この予備成形物を減圧雰囲気中に置き該成形物内の空
気を除去し、次いで上記ポリエチレンの融点以上に加熱
された水蒸気雰囲気中で焼結した後冷却することを特徴
とするものである。That is, the UHPE porous packaging method according to the present invention
E Powder is filled into a metal mold, heated at a temperature lower than the melting point of the polyethylene, and then pressurized to obtain a preform, and the preform is placed in a reduced pressure atmosphere to remove air within the mold. Then, the polyethylene is sintered in a steam atmosphere heated to a temperature higher than the melting point of the polyethylene, and then cooled.
また、本発明の他の態様においては、上記方法によって
得られるブロック状多孔質体を所定厚さに切削すること
により、シート状多孔質体を得ることができる。In another aspect of the present invention, a sheet-like porous body can be obtained by cutting the block-like porous body obtained by the above method to a predetermined thickness.
本発明においては、先ず、ＵＨＰＥ粉末が金型に充填さ
れ、加熱される。In the present invention, first, UHPE powder is filled into a mold and heated.
この加熱温度はＵＨＰＥの融点よりも低い温度とするが
、温度（Ｘ″Ｃ）ｔ−下記式で示される範囲に設定する
のが好適であることが、本発明者の実験によって判明し
た。Although this heating temperature is set to be lower than the melting point of UHPE, it has been found through experiments by the present inventors that it is suitable to set it within the range expressed by the following formula: temperature (X″C)t−.
（Ｕｌ（ＰＥの融点−２０℃）≦Ｘ＜ＵＨＰＥの融点ま
た、加熱時間は温度によって変わり得るが、通常金型内
で形成される予備成形物の肉厚１３当り約３０〜６０分
である。(Ul (melting point of PE -20℃)≦X<melting point of UHPE Also, the heating time may vary depending on the temperature, but is usually about 30 to 60 minutes per wall thickness of the preform formed in the mold. .
この加熱後に金型内に充填せしめられているＵＨＰＥ粉
末が加圧され、予備成形物が得られる。After this heating, the UHPE powder filled in the mold is pressurized to obtain a preform.
加圧は、通常、約０．３〜４０ｋｇ／ｃ−ｊの圧力ｔ−
Ｕｆ（ＰＥ粉末に作用させ、金型内におけるＵＨＰＥ粉
末の充填高さを調整する方法によって行なうことができ
る。The pressurization is usually at a pressure t- of about 0.3 to 40 kg/c-j.
This can be done by a method of adjusting the filling height of UHPE powder in the mold by acting on Uf (PE powder).
金型内で形成される予備成形物の重量（金型に充填した
ＵＨＰＥの重量）、予備成形物の底面積（通常は金型の
底面積と同じ）、予備成形物の高さ（金型へのＵＩ（Ｐ
Ｅの充填高さ）および予備成形物の比重の間には下記の
関係式（１）が成立する。The weight of the preform formed in the mold (the weight of the UHPE filled in the mold), the base area of the preform (usually the same as the base area of the mold), the height of the preform (the weight of the UHPE filled in the mold), UI to (P
The following relational expression (1) holds between the filling height of E) and the specific gravity of the preform.
重量＝底面積×高さＸ比重・・・・・・・・・・・・・
・・（１）従って、上記加圧により金型へのＵＨＰＥの
充填高さを所定値にすることによって、予備成形物の比
重を決定できる。即ち、同一の金型を用い、ＵＨＰＥ粉
末の充填重量を同量とした場合には、充填高さが高い程
、比重の小さな予備成形物が得られる。なお、本発明に
おいては、比重が約０．４６〜０．８５ Ｋなるように
充填高さを調整するのが作業性の点から好ましいことが
判明した。Weight = Base area x height x specific gravity・・・・・・・・・・・・
(1) Therefore, the specific gravity of the preform can be determined by setting the filling height of UHPE into the mold to a predetermined value by applying the above-mentioned pressure. That is, when the same mold is used and the filling weight of UHPE powder is the same, the higher the filling height, the lower the specific gravity of the preform can be obtained. In the present invention, it has been found that it is preferable from the viewpoint of workability to adjust the filling height so that the specific gravity is about 0.46 to 0.85 K.
そして、本発明の方法によって得られる多孔質体の比重
は、他の条件が同じであれば、予備成形物の比重と密接
な関連性を有し、予備成形物の比重が高い程、その成形
物を用いて得られる多孔質体の比重も高くなる。この意
味において、加圧は多孔質体の比重決定工程と見ること
ができる。そして、加圧工程によって得られる予備成形
物の比重を上記範囲に設定した場合には、後の工程の条
件によって多少変わり得るが、比重が約０．６０〜０．
８０の多孔質体が得られる。The specific gravity of the porous body obtained by the method of the present invention is closely related to the specific gravity of the preform, if other conditions are the same, and the higher the specific gravity of the preform, the more The specific gravity of the porous body obtained using the material also increases. In this sense, pressurization can be seen as a process for determining the specific gravity of the porous body. When the specific gravity of the preform obtained by the pressing step is set within the above range, the specific gravity may vary somewhat depending on the conditions of the subsequent step, but the specific gravity is approximately 0.60 to 0.60.
80 porous bodies are obtained.
上記加圧工程によって得られる予備成形物は減圧雰囲気
中に置かれる。これは予備成形物に形成された無数の気
孔の内の空気を除去するために行なうものである。脱気
は、例えば予備成形物を金型から取り出し、耐圧容器中
に入れ減圧する方法によって行なうことができる。雰囲
気圧は、通常、約０．１〜１０１１ＭＨｆ／テアル。The preform obtained by the above pressurizing step is placed in a reduced pressure atmosphere. This is done to remove air from the numerous pores formed in the preform. Degassing can be carried out, for example, by taking the preform out of the mold, placing it in a pressure-resistant container, and reducing the pressure. The atmospheric pressure is usually about 0.1 to 1011 MHf/teal.
このようにして脱気された予備成形物は、次いでＵＨＰ
Ｅの融点以上に加熱された水蒸気雰囲気中で焼結される
。The preform thus degassed is then subjected to UHP
It is sintered in a steam atmosphere heated above the melting point of E.
このとき、予備成形物は脱気状態であり、しかも水蒸気
はＵＨＰＥの融点以上に昇温するため加圧されているの
で、該成形物の気孔内に容易に浸入して速やかに熱を伝
達し、成形物を焼結する。At this time, the preform is in a degassed state, and the steam is pressurized to raise the temperature above the melting point of UHPE, so it easily enters the pores of the mold and quickly transfers heat. , sinter the molded product.
このように、予備成形物の脱気状態を維持しつつ、水蒸
気焼結を行なった場合には、熱が該成形物の全体に均−
且つ速やかに伝達され、この結果、均一な構造を有する
多孔質体が得られるのである。In this way, when steam sintering is performed while maintaining the degassed state of the preform, heat is distributed evenly throughout the preform.
It is transmitted quickly and as a result, a porous body with a uniform structure is obtained.
従って、この加熱水蒸気による焼結工程は、前記耐圧容
器に水蒸気導入管およびパルプ忙設けておき、予備成形
物中の空気を除去した後、減圧を止め或いは減圧を続け
ながら、上記バルブを開き加熱水蒸気を導入する方法に
よって行なうのが好ましいものである。Therefore, in this sintering process using heated steam, a steam introduction pipe and a pulp pipe are installed in the pressure-resistant container, and after removing the air in the preform, the vacuum is stopped or the vacuum is continued while the vacuum is continued, and the valve is opened to heat the container. It is preferable to carry out the method by introducing water vapor.
焼結に要する時間は予備成形物の大きさ、温度等によっ
て変わり得るが、通常、約３〜６時間であり、前記従来
法のそれが約４８〜７２時間であるのに比べ短縮が可能
である。The time required for sintering may vary depending on the size of the preform, temperature, etc., but it is usually about 3 to 6 hours, which can be shortened compared to the conventional method, which takes about 48 to 72 hours. be.
この焼結後、冷却すればブロック状のＵＨＰＥ多孔質多
孔得体れる。冷却に際しては亀裂等の発生防止のため急
冷を避けるのがよく、通常、室温に放置する方法が採用
される。After this sintering, if it is cooled, a block-shaped UHPE porous material is obtained. When cooling, it is best to avoid rapid cooling to prevent the occurrence of cracks, etc., and a method of leaving the product at room temperature is usually adopted.
なお、このブロック状多孔質体を旋盤等で所定厚さに切
削すれば、シート状多孔質体が得られる。Note that by cutting this block-like porous body to a predetermined thickness using a lathe or the like, a sheet-like porous body can be obtained.
（実施例）
以下、実施例により本発明を更に詳細に説明するＯ
実施例Ｉ
ＵＨＰＥ粉末（分子１１３００万、融点１３５’Ｏ）８
００ｇを金型（底面積１００ｄ）に充填し、温度１３０
℃で６時間加熱する。(Example) Hereinafter, the present invention will be explained in more detail with reference to Examples. Example I UHPE powder (molecules 113 million, melting point 135'O) 8
00g was filled into a mold (bottom area 100d) and the temperature was 130g.
Heat at ℃ for 6 hours.
この加熱後、ｏ、ｓｋｑ／ｄの圧力によりＵＨＰＥ粉末
の充填高さを１０３に調整し、比重０．８の丸棒状の予
備成形物を得る。After this heating, the filling height of the UHPE powder is adjusted to 103 by using a pressure of o, skq/d to obtain a round bar-shaped preform with a specific gravity of 0.8.
次に、予備成形物を金属製耐圧容器（水蒸気導入管およ
びその關閉用パルグを備える）＆Ｃ入れ、雰囲気圧ｆ
１ ｍＨｆとし、３０分間脱気を行なｈ１真空ポンプを
止める。Next, the preform was placed in a metal pressure-resistant container (equipped with a water vapor introduction pipe and a plug for closing the same) &C, and the atmospheric pressure f
The pressure was set to 1 mHf, and the air was degassed for 30 minutes, and the h1 vacuum pump was stopped.
次いで、上記パルプを開き、温度１６０°Ｃ１圧力５．
５気圧の水蒸気を減圧雰囲気中に導入し、１８０分間加
熱して予備成形物を焼結した後、得られた丸棒状多孔質
体を耐圧容器から取り出し、温度２５℃の室で放冷した
。Then, the above pulp was opened and heated to 160° C. and 5.0 pressure.
After introducing water vapor at 5 atm into a reduced pressure atmosphere and heating for 180 minutes to sinter the preform, the obtained round rod-shaped porous body was taken out of the pressure container and allowed to cool in a room at a temperature of 25°C.
そして、丸棒状多孔質体を旋盤により、周方向に沿って
厚さ１００μｍに切削し、シート状多孔質体を得た。Then, the round bar-shaped porous body was cut along the circumferential direction to a thickness of 100 μm using a lathe to obtain a sheet-shaped porous body.
このシート状多孔質体の長さ方向において、所定間隔毎
に比重を測定し、得られた結果を第１図に示す。第１図
において［距離ＯＪは切削初めの部分（丸棒状多孔質体
の最外周部分）を示し、距離が大きくなるにつれて切削
路りの部分（丸棒状多孔質体の中心部）に近くなること
を示している。The specific gravity was measured at predetermined intervals along the length of this sheet-like porous body, and the results are shown in FIG. In Fig. 1, [distance OJ] indicates the beginning of cutting (the outermost circumference of the round rod-shaped porous body), and as the distance increases, it becomes closer to the cutting path (the center of the round rod-shaped porous body). It shows.
この第１図から本実施例によれば、比重０．８１〜０．
８３（気孔率に換算すると１２．３〜１３．４％）の均
一な多孔質構造を有するＵＨＰＥ成形品が得られること
が判る。From FIG. 1, according to this example, the specific gravity is 0.81 to 0.
It can be seen that a UHPE molded article having a uniform porous structure of 83% (12.3 to 13.4% when converted to porosity) can be obtained.
実施例２
充填高さの調整に際し、圧力を０．３ ｋＱ／ｄとし、
高さｔ１４．５３とすること以外は全て実施例１と同様
に作業し、シート状多孔質体を得た。Example 2 When adjusting the filling height, the pressure was set to 0.3 kQ/d,
A sheet-like porous body was obtained by carrying out the same operations as in Example 1 except that the height was t14.53.
このシート状多孔質体の比重は第１図に示すとおり０．
５１〜０．５４ （気孔率に換算すると４２．２〜４５
．５１）であシ、多孔質構造は均一であった。As shown in FIG. 1, the specific gravity of this sheet-like porous material is 0.
51~0.54 (42.2~45 when converted to porosity)
．． 51) The porous structure was uniform.
比較例
実施例１と同様にしてＵＨＰＥ粉末の金型への充填、加
熱および加圧を行なう。Comparative Example In the same manner as in Example 1, UHPE powder was filled into a mold, heated and pressurized.
次に、温度１４０°Ｃの加熱炉中で２時間加熱して焼結
した後、温度２５℃の室で放冷した。Next, after sintering by heating in a heating furnace at a temperature of 140° C. for 2 hours, it was allowed to cool in a room at a temperature of 25° C.
その後、金型を取り外して丸棒状多孔質体を得、更に実
施例１と同様にしてシート状に切削した。Thereafter, the mold was removed to obtain a round rod-shaped porous body, which was further cut into a sheet shape in the same manner as in Example 1.
このシート状多孔質体の比重は第１図に示すとおり０．
５５〜０．９２ （気孔率に換算すると１．６〜４１．
２１）であり、バラツキが大きく、多孔質構造が不均一
であった。As shown in FIG. 1, the specific gravity of this sheet-like porous material is 0.
55-0.92 (1.6-41. when converted to porosity)
21), the variation was large and the porous structure was non-uniform.
（発明の効果）
本発明は上記のように構成されており、加熱および加声
によって得られる予備成形Ｚａ を脱気し、次いで加熱
された水蒸気により焼結するようにしたので、成形Ｘ〕
全全体熱が速ヤかに伝達するので、均一な多孔質体を得
ることができる。(Effects of the Invention) The present invention is configured as described above, and the preformed Za obtained by heating and accumulating is degassed and then sintered with heated steam, so that the forming X]
Since the entire heat is rapidly transferred, a uniform porous body can be obtained.
【図面の簡単な説明】
図面は本発明に係る方法および従来法によって得られる
多孔質体の比重の測定結果を示すグラフである。BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a graph showing the measurement results of the specific gravity of porous bodies obtained by the method according to the present invention and the conventional method.
Claims (2)
ポリエチレンの融点よりも低い温度で加熱した後加圧す
ることにより予備成形物を得、この予備成形物を減圧雰
囲気中に置き該成形物内の空気を除去し、次いで上記ポ
リエチレンの融点以上に加熱された水蒸気雰囲気中で焼
結した後冷却することを特徴とする超高分子量ポリエチ
レン多孔質体の製造法。(1) A mold is filled with ultra-high molecular weight polyethylene powder, heated at a temperature lower than the melting point of the polyethylene, and then pressurized to obtain a preform, and the preform is placed in a reduced pressure atmosphere to form the mold. 1. A method for producing an ultra-high molecular weight polyethylene porous body, which comprises removing air therein, then sintering in a steam atmosphere heated above the melting point of the polyethylene, and then cooling.
ポリエチレンの融点よりも低い温度で加熱した後加圧す
ることにより予備成形物を得、この予備成形物を減圧雰
囲気中に置き該成形物内の空気を除去し、次いで上記ポ
リエチレンの融点以上に加熱された水蒸気雰囲気中で焼
結した後冷却することによりブロック状多孔質体を得、
更に該多孔質体を所定厚さに切削することを特徴とする
超高分子量ポリエチレン多孔質シートの製造法。(2) Fill a mold with ultra-high molecular weight polyethylene powder, heat it at a temperature lower than the melting point of the polyethylene, and then pressurize it to obtain a preform, and place the preform in a reduced pressure atmosphere to form the mold. A block-shaped porous body is obtained by removing air therein, then sintering in a steam atmosphere heated to a temperature higher than the melting point of the polyethylene, and then cooling.
A method for producing an ultra-high molecular weight polyethylene porous sheet, which further comprises cutting the porous body to a predetermined thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3454689A JPH02214647A (en) | 1989-02-14 | 1989-02-14 | Manufacture of ultra-high-molecular weight polyethylene porous material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3454689A JPH02214647A (en) | 1989-02-14 | 1989-02-14 | Manufacture of ultra-high-molecular weight polyethylene porous material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02214647A true JPH02214647A (en) | 1990-08-27 |
| JPH0566855B2 JPH0566855B2 (en) | 1993-09-22 |
Family
ID=12417307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3454689A Granted JPH02214647A (en) | 1989-02-14 | 1989-02-14 | Manufacture of ultra-high-molecular weight polyethylene porous material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02214647A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7550555B2 (en) | 2002-01-29 | 2009-06-23 | Smith & Nephew Orthopaedics Ag | Sintering ultrahigh molecular weight polyethylene |
| US7851058B2 (en) | 2004-07-13 | 2010-12-14 | Nitto Denko Corporation | Sheet for suction and fixation, and method of producing the same |
| US8488274B2 (en) * | 2003-04-09 | 2013-07-16 | Nitto Denko Corporation | Sliding member for recording media |
| US8871131B2 (en) | 2006-10-30 | 2014-10-28 | Smith And Nephew Orthopaedics Ag | Processes comprising crosslinking polyethylene or using crosslinked polyethylene |
-
1989
- 1989-02-14 JP JP3454689A patent/JPH02214647A/en active Granted
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7550555B2 (en) | 2002-01-29 | 2009-06-23 | Smith & Nephew Orthopaedics Ag | Sintering ultrahigh molecular weight polyethylene |
| US7863410B2 (en) | 2002-01-29 | 2011-01-04 | Smith & Nephew Orthopaedics Ag | Sintering ultrahigh molecular weight polyethylene |
| US8488274B2 (en) * | 2003-04-09 | 2013-07-16 | Nitto Denko Corporation | Sliding member for recording media |
| US7851058B2 (en) | 2004-07-13 | 2010-12-14 | Nitto Denko Corporation | Sheet for suction and fixation, and method of producing the same |
| US8871131B2 (en) | 2006-10-30 | 2014-10-28 | Smith And Nephew Orthopaedics Ag | Processes comprising crosslinking polyethylene or using crosslinked polyethylene |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0566855B2 (en) | 1993-09-22 |
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