JPS5829327B2 - Polytetrafluoroethylene porous sheet - Google Patents
Polytetrafluoroethylene porous sheetInfo
- Publication number
- JPS5829327B2 JPS5829327B2 JP56155931A JP15593181A JPS5829327B2 JP S5829327 B2 JPS5829327 B2 JP S5829327B2 JP 56155931 A JP56155931 A JP 56155931A JP 15593181 A JP15593181 A JP 15593181A JP S5829327 B2 JPS5829327 B2 JP S5829327B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- ptfe
- porous
- stretching
- porous sheet
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
- B29C67/205—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored comprising surface fusion, and bonding of particles to form voids, e.g. sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】
本発明は焼成されたポリテトラフルオロエチレン(以下
PTFEと称す)多孔質シートに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a calcined polytetrafluoroethylene (hereinafter referred to as PTFE) porous sheet.
近年、PTFE多孔質シートを織布、編布或いは不織布
のような布状基材と積層(例えばホットメルト接着剤に
より点状、網目状、筋状等の形状で部分接着させる)せ
しめ、この積層シートをスポーツウェア、ショーツ或い
はおむつカバー等に用いる試みがなされている。In recent years, PTFE porous sheets have been laminated with cloth-like substrates such as woven fabrics, knitted fabrics, or non-woven fabrics (for example, by partially adhering them in the form of dots, meshes, stripes, etc. using hot melt adhesive), and this lamination Attempts have been made to use sheets for sportswear, shorts, diaper covers, and the like.
上記積層シートから得られる各種物品は、PTFE多孔
質シートを構成材料としているので、撥水性を有してい
るばかりでなく、通気性をも兼備しており、使用時発汗
による「蒸れ」を生ずることがなく好ましいものである
。Since the various products obtained from the above-mentioned laminated sheets are composed of porous PTFE sheets, they are not only water repellent but also breathable, and do not get stuffy due to sweating during use. It is preferable without any problems.
ところで、これら各種物品は使用に伴なう汚れを取り除
くため、頻繁に洗濯される。Incidentally, these various articles are frequently washed to remove dirt caused by use.
洗濯は上記積層シートから得られる物品の構成材料とし
てのPTFE多孔質シートにとっては過酷なもので、寿
命の短命化をもたらしている。Washing is harsh on the PTFE porous sheet as a constituent material of the article obtained from the laminated sheet, resulting in a shortened lifespan.
例えば、上記積層シートを用いてこれら物品を得るため
に通常行なわれる縫製加工時には縫製糸が多孔質シート
および布状基材を貫通するが、多孔質シートの縫製糸貫
通部における強度が低下し、洗濯時に多孔質シートの縫
製糸貫通部から亀裂を生じ、その結果、物品は撥水性を
喪失し、実用に耐え得なくなってしまうことがある。For example, during the sewing process that is normally performed to obtain these articles using the above-mentioned laminated sheet, the sewing thread penetrates the porous sheet and the cloth-like base material, but the strength of the sewing thread penetrating portion of the porous sheet decreases. Cracks may occur at the sewing thread penetration portions of the porous sheet during washing, and as a result, the article may lose its water repellency and become unusable.
また、洗濯時にPTFE多孔質シートに使用する応力に
より、多孔質シー、ト中の微細孔に亀裂が生じ撥水性能
の低下を生ずることがある。Furthermore, the stress applied to the porous PTFE sheet during washing may cause cracks in the micropores in the porous sheet, resulting in a decrease in water repellency.
このようにPTFE多孔質シートと布状基材から成る積
層シートから得られるスポーツウェア等の物品は、撥水
性と通気性を兼備し、しかも使用時に蒸れを生じないと
いう長所を有しており、広範な用途展開が見込まれてい
るにもかかわらず、耐洗濯性が充分でないため、未だ実
用化に至っていないの実状である。In this way, articles such as sportswear obtained from a laminated sheet consisting of a porous PTFE sheet and a cloth-like base material have the advantage of having both water repellency and breathability, and not causing stuffiness during use. Although it is expected to be used in a wide range of applications, it has not yet been put into practical use due to insufficient washing resistance.
本発明はこのような現状を打開するもので、PTFE多
孔質シートと布状基材を部分接着させて成る積層シート
から得られるスポーツウェア等の耐洗濯性を改良し、該
物品を実用化し得るPTFE多孔質シートを提供する。The present invention overcomes the current situation, and improves the washing resistance of sportswear etc. obtained from a laminated sheet made by partially adhering a PTFE porous sheet and a cloth-like base material, and makes it possible to put the article into practical use. A PTFE porous sheet is provided.
本発明者達は布状基材と部分接着により積層して得られ
る物品における耐洗濯性を改良し得るようなPTFE多
孔質シートを提供するため鋭意研究の結果、互に直交す
る2方向への延伸により多孔質化され且つ焼成されてい
るPTFE多孔質シートであって、平均分子量が所定値
値以上のPTFE粉末から形成されており、各延伸方向
の伸び率がいずれも所定数値以上であり、しかも伸び比
が所定数値以上であるシートが、洗濯時における縫製糸
貫通部の亀裂発生や微細孔の亀裂を生じないことを見出
し、本発明を完成するに至ったものである。The present inventors have conducted intensive research to provide a porous PTFE sheet that can improve the washing resistance of articles obtained by laminating it with a cloth-like base material by partial adhesion. A porous PTFE sheet that has been made porous by stretching and fired, is formed from PTFE powder having an average molecular weight of a predetermined value or more, and has an elongation rate in each stretching direction of a predetermined value or more, Moreover, it was discovered that a sheet having an elongation ratio equal to or higher than a predetermined value does not cause cracks in the sewing thread penetrating portion or cracks in the micropores during washing, leading to the completion of the present invention.
即ち、本発明に係るPTFE多孔質シートは、互に直交
する2方向への延伸により多孔質化され且つ焼成されて
いるPTFE多孔質シートであって、(a)平均分子量
が200万以上のPTFE粉末から形成されていること
、(b)各延伸方向における伸び率がいずれも50多以
上であること、および(c)伸び比が015以上である
こと、を特徴とするものである。That is, the porous PTFE sheet according to the present invention is a porous PTFE sheet that has been made porous by stretching in two directions perpendicular to each other and is fired, and includes (a) PTFE having an average molecular weight of 2 million or more; (b) The elongation ratio in each stretching direction is 50 or more, and (c) The elongation ratio is 0.15 or more.
本発明に係るPTFE多孔質シートは、互に直交する2
方向への延伸により多孔質化され且つ焼成されたもので
、前記(a) 、 (b)および(c)の要件を満たす
ものでなければならない。The PTFE porous sheet according to the present invention has two
It must be made porous by stretching in the direction and fired, and must satisfy the requirements (a), (b), and (c) above.
これら要件のいずれかを欠くと、これを布状基材と部分
接着により積層して得られる物品は耐洗濯性く劣るもの
となってしまい、洗濯時に縫製糸貫通部から簡単に亀裂
を生じたり、微細孔に亀裂を生じたりして撥水性能が低
下する不都合を生ずるので好ましくない。If any of these requirements are missing, the product obtained by laminating this material with a cloth-like base material by partial adhesion will have poor washing resistance, and will easily crack from the sewing thread penetration part during washing. This is not preferable because it causes problems such as cracks in the micropores and a decrease in water repellency.
本発明のPTFE多孔質シートを得るのに用いられるP
TFE粉末の平均分子量は、PTFE粉末の比重(S、
G、)を測定し、このS、G、の値から次式によって求
められる。P used to obtain the PTFE porous sheet of the present invention
The average molecular weight of TFE powder is determined by the specific gravity (S,
G,) is measured and calculated from the values of S and G by the following equation.
1ogl□Mn=22.524 9.967X(S−G
−)この式に従えば、例えば平均分子量200万はS、
G、2.23に相当する。1ogl□Mn=22.524 9.967X(S-G
-) According to this formula, for example, the average molecular weight of 2 million is S,
G, corresponds to 2.23.
換言すれば本発明において平均分子量200万以上とい
うことは、S 、G。In other words, in the present invention, an average molecular weight of 2,000,000 or more means S, G.
2.23以下と同義である。It is synonymous with 2.23 or less.
同様に平均分子量250万以上ということは、S、G、
2.22以下であることと同義である。Similarly, an average molecular weight of 2.5 million or more means S, G,
It is synonymous with being 2.22 or less.
PTFE粉末のS、G、の測定は次の方法によって行な
う。Measurement of S and G of PTFE powder is performed by the following method.
即ち、23〜25℃に調温した雰囲気中で試料粉末5グ
を断面が32mmの円形である金型中で200 kg/
cdの圧力で圧縮し、これを金型から取り出して380
℃の空気炉に入れ、30分間焼成した後、70°C/h
rの冷却速度で300℃まで冷却し、炉から取り出して
室温中で放冷する。That is, in an atmosphere whose temperature was controlled to 23 to 25°C, 5 grams of sample powder was placed in a circular mold with a cross section of 32 mm at a weight of 200 kg/kg.
Compressed with CD pressure, taken out from the mold and heated to 380
After baking for 30 minutes in an air oven at 70°C/h
It is cooled to 300° C. at a cooling rate of r, taken out from the furnace, and allowed to cool at room temperature.
S、G、はこのサンプルの空気中の重さと、同体積の2
3℃の水の重さの比として求められる値である。S, G are the weight of this sample in air and 2 of the same volume.
This value is determined as a ratio of the weight of water at 3°C.
また、PTFE多孔質シートの各延伸方向における伸び
率は、JIS−に−6885に定められる方法により測
定することができる。Further, the elongation rate of the porous PTFE sheet in each stretching direction can be measured by the method specified in JIS-6885.
更に、本発明における伸び比とは上記の方法によって求
められた各延伸方向の伸び率を下記式に適用することに
よって求められる。Furthermore, the elongation ratio in the present invention is determined by applying the elongation percentages in each stretching direction determined by the above method to the following formula.
ト
ν
互に直交する2方向への延伸により多孔質化され且つ焼
成されているPTFEシートが本発明のように(a)
、 (b)および(C)の要件を満たすとき、布状基材
と部分接着により積層されて得られる物品の耐洗濯性が
何故改良されるかは明らおではないが、いずれにしても
以下の実施例からも判るように、本発明に係るPTFE
多孔質シートにおいては耐洗濯性が確実に改良されてい
ることが確認された。(a) A PTFE sheet that has been made porous by stretching in two directions perpendicular to each other and has been fired is
, It is not clear why the washing resistance of the article laminated with the cloth-like base material by partial adhesion is improved when the requirements of (b) and (C) are met, but in any case, As can be seen from the following examples, PTFE according to the present invention
It was confirmed that the washing resistance of the porous sheet was definitely improved.
なお、本発明のPTFE多孔質シートの厚さは通常10
〜200μであり、気孔率は通常50〜95%である。Note that the thickness of the PTFE porous sheet of the present invention is usually 10
~200μ, and the porosity is typically 50-95%.
次に、本発明に係るPTFE多孔質シートの製造法につ
いて述べる。Next, a method for manufacturing a porous PTFE sheet according to the present invention will be described.
この多孔質シートは、例えば平均分子量が200万以上
の未焼成PTFE粉末に適量の液状潤滑剤を加えて成る
混和物を、押出または圧延の少なくとも一方を含む方法
により長尺のシート状に成形せしめ、次いでこの未焼成
シート状物を327℃以上の温度に加熱して焼成しなか
ら長尺方向に延伸せしめ、その後前記延伸方向と直交す
る方向(幅方向)に延伸する方法によって得ることがで
きる。This porous sheet is made by forming a mixture of unfired PTFE powder with an average molecular weight of 2 million or more and an appropriate amount of liquid lubricant into a long sheet by a method including at least one of extrusion and rolling. Then, this unfired sheet material is heated to a temperature of 327° C. or higher and stretched in the longitudinal direction without firing, and then stretched in a direction (width direction) perpendicular to the stretching direction. .
この方法によってPTFE多孔質シートを得るための第
1工程は、平均分子量が200万以上の未焼成PTFE
粉末と適量の液状潤滑剤を却−に混和し、該混和物を押
出または圧延の少なくとも一方を含む手段で長尺の未焼
成シート状物を得る成形工程である。The first step to obtain a porous PTFE sheet by this method is to use unsintered PTFE with an average molecular weight of 2 million or more.
This is a forming process in which powder and an appropriate amount of liquid lubricant are mixed together, and the mixture is formed into a long unfired sheet by means including at least one of extrusion and rolling.
該第1工程においては、他の成形方法例えば圧縮等を付
加的に行なうこともできる。In the first step, other molding methods such as compression can also be additionally performed.
未焼成PTFE粉末として平均分子量が200万以上好
ま、シ<は250万〜1000万のものを用いることは
本発明において特に重要であり、上記所定の平均分子量
を有するPTFE粉末を選択して使用することによって
、耐洗濯性を有する物品の構成材料として有用な多孔質
シートが得られるのである。It is particularly important in the present invention to use unsintered PTFE powder with an average molecular weight of 2 million or more, and < 2.5 million to 10 million, and PTFE powder having the above-described predetermined average molecular weight is selected and used. By doing so, a porous sheet useful as a constituent material of articles having washing resistance can be obtained.
この第1工程において用いられる液状潤滑剤としては、
PTFEの表面を濡らすことができ、未焼成シート状物
を得た後蒸発、抽出等によって除去し得るものが使用さ
れ、その具体例としては流動パラフィン、ナフサ、ホワ
イトオイル等の炭化水素油、トルエン、キシレン等の芳
香族炭化水素類、アルコール類、ケトン類、エステル類
、シリコーンオイル、フルオロクロロカーボンオイル、
これら溶剤にポリイソブチレン、ポリイソプレン等の重
合体を溶かした溶液、これらの2つ以上の混合物、表面
活性剤を含む水または水溶液等が挙げられる。The liquid lubricant used in this first step is:
Materials that can wet the surface of PTFE and can be removed by evaporation, extraction, etc. after obtaining an unfired sheet are used; specific examples include liquid paraffin, naphtha, hydrocarbon oils such as white oil, and toluene. , aromatic hydrocarbons such as xylene, alcohols, ketones, esters, silicone oil, fluorochlorocarbon oil,
Examples include solutions in which polymers such as polyisobutylene and polyisoprene are dissolved in these solvents, mixtures of two or more of these, and water or aqueous solutions containing surfactants.
この方法における第1工程において、未焼成PTFE粉
末と混和する液状潤滑剤の量は、未焼成シート状物を得
る際の成形方法、他の添加剤の有無等によって変るが通
常PTFE粉末100重量部に対し約5〜50重量部程
度用いられ、好ましくは10〜30重量部用いられる。In the first step of this method, the amount of liquid lubricant mixed with the green PTFE powder varies depending on the forming method used to obtain the green sheet, the presence or absence of other additives, etc., but is usually 100 parts by weight of the PTFE powder. It is used in an amount of about 5 to 50 parts by weight, preferably 10 to 30 parts by weight.
更にこの方法においては未焼e、PTFE粉末に前記液
状潤滑剤を混和する際に種々の添加剤、例えば着色のた
めの顔料或いは耐摩耗性の改良のためにカーボンブラッ
ク、グラファイト、シリカ粉、アスベスト粉、ガラス粉
、金属粉、金属酸化物粉、金属酸化物粉等を混和するこ
ともできる。Furthermore, in this method, various additives such as pigments for coloring, carbon black, graphite, silica powder, asbestos for improving wear resistance are added when the liquid lubricant is mixed with the unburned PTFE powder. It is also possible to mix powder, glass powder, metal powder, metal oxide powder, metal oxide powder, etc.
上記第1工程を経て得られる未焼成シート状物は、次い
で第2工程が施されるが、本方法の実施に際し多くの場
合、液状潤滑剤は第2工程以前に加熱法、抽出法或いは
これらを組み合せた方法等により除去される。The unfired sheet material obtained through the first step is then subjected to the second step, but in many cases when implementing this method, the liquid lubricant is processed by a heating method, an extraction method, or any of these methods before the second step. It is removed by a combination of methods, etc.
なお、第2工程において液状潤滑剤の除去を行なうこと
もできる。Note that the liquid lubricant can also be removed in the second step.
本方法の第2工程においては、長尺の未焼成シート状物
が327℃以上好ましくは340〜410℃の温度に加
熱され焼成されなから長尺方向に延伸され多孔質化され
る。In the second step of the method, the elongated unfired sheet is heated to a temperature of 327° C. or higher, preferably 340 to 410° C., and then stretched in the longitudinal direction without being fired to make it porous.
なお、この際の延伸率は通常100〜750%好ましく
は400〜700条であり、延伸速度は通常10%/
sec以下である。Note that the stretching rate at this time is usually 100 to 750%, preferably 400 to 700 strips, and the stretching speed is usually 10%/
It is less than sec.
未焼成シート状物をこのようにして焼成しながら延伸す
ると、機械的強度が増加すると共に無数の微細孔が形成
される。When the unfired sheet material is stretched while being fired in this manner, its mechanical strength increases and numerous micropores are formed.
このようにして第1工程および第2工程を経て得られる
シート状物は、次いで幅方向に延伸される。The sheet-like material thus obtained through the first step and the second step is then stretched in the width direction.
この際の延伸率は通常100〜750%好ましくは30
0〜600%である。The stretching ratio at this time is usually 100 to 750%, preferably 30%.
It is 0-600%.
なお、幅方向への延伸率は、本発明のPTFE多孔質シ
ートを布状基材と積層して得られる物品の耐洗濯性を考
慮すると、幅方向の延伸率:長尺方向の延伸率の比が1
=1〜4.5好ましくは1:1.1〜1.6になるよう
に設定するのが好適である。Note that the stretching ratio in the width direction is determined by the ratio of the stretching ratio in the width direction to the stretching ratio in the longitudinal direction, considering the washing resistance of the article obtained by laminating the PTFE porous sheet of the present invention with a cloth-like base material. The ratio is 1
It is suitable to set it so that =1-4.5, preferably 1:1.1-1.6.
また、延伸温度はPTFEの焼成温度である327℃以
上或いはそれ以下のいずれも設定できる。Further, the stretching temperature can be set at either 327° C. or higher, which is the firing temperature of PTFE, or lower than that.
以下、実施例により本発明を更に詳細に説明する。Hereinafter, the present invention will be explained in more detail with reference to Examples.
実施例
平均分子量300万の未焼成PTFE粉100重量部に
対し液状潤滑剤ナフサ1号20部を均一に混合した混和
物を圧力20Kg/c4で圧縮予備成形し、次にこれを
丸棒状に押出成形し更にこの丸棒状物を1対の金属製圧
延ロール間を通し、厚さ130μ、幅115mの長尺の
未焼成シート状物を得、その後このシート状物を120
℃で2分間加熱し液状潤滑剤を除去して管状芯体にロー
ル状に巻回する。Example A mixture of 100 parts by weight of unsintered PTFE powder with an average molecular weight of 3 million and 20 parts of liquid lubricant Naphtha No. 1 was pre-compressed at a pressure of 20 kg/c4, and then extruded into a round bar shape. This round bar-shaped product was then passed through a pair of metal rolling rolls to obtain a long unfired sheet with a thickness of 130 μm and a width of 115 m.
The liquid lubricant is removed by heating at ℃ for 2 minutes, and the mixture is wound into a roll around a tubular core.
その後、第1図に示すように管状芯体上に巻回せしめた
未焼成シート状物1を延伸装置の繰り出し側にセットし
、その長さ方向の一端を巻き取りロール2に導き、加熱
ゾーン3の温度を350℃に保ち、該加熱ゾーン3の入
口側に設けられたl対のピンチロール4の回転速度より
も出口側に設けられた1対のピンチロール5の回転速度
を大にして、シート状物1の加熱ゾーン内配置部分を焼
成しなから長尺方向に300%延伸(延伸速度5.5%
/5ec)L、厚さ108μ、幅93閣のシート11を
得る。Thereafter, as shown in FIG. 1, the unfired sheet material 1 wound around the tubular core is set on the feeding side of the stretching device, and one end of the material in the longitudinal direction is guided to the winding roll 2, and the heating zone is 3 is maintained at 350° C., and the rotational speed of the pair of pinch rolls 5 provided on the outlet side of the heating zone 3 is set higher than the rotational speed of the pair of pinch rolls 4 provided on the inlet side of the heating zone 3. , the part of the sheet-like material 1 disposed in the heating zone is stretched by 300% in the longitudinal direction (stretching speed 5.5%) before firing.
/5ec) L, thickness 108μ, width 93mm sheet 11 was obtained.
この場合、ピンチロール4および5には温度20℃の冷
風を吹き付け、シート状物1の加熱ゾーン内配置部分を
延伸する際の基点6.7の軟化乃至溶融を防止した。In this case, cold air at a temperature of 20° C. was blown onto the pinch rolls 4 and 5 to prevent softening or melting of the base point 6.7 when stretching the portion of the sheet-like material 1 disposed in the heating zone.
なお、8および9はガイドロール、10は冷却ロールで
ある。Note that 8 and 9 are guide rolls, and 10 is a cooling roll.
次に、このシート11を第2図に示すテンタ一式延伸装
置の1対のピンチロール4を通し、入口側から出口側に
いくにつれて加熱領域の広がる形状の加熱ゾーン3に導
き、加熱ゾーン3の温度を350℃に保つと共に前記ピ
ンチロール4と出口側の1対のピンチロール5の回転速
度わ略同−に設定し、シート11の幅方向の両端を加熱
ゾーン3の両側端よりも外部に設置されたチャック12
にて把握して、シート11の加熱ゾーン内配置部分を幅
方向に300φ延伸(延伸速度2.7 %/ 5ec)
し、厚さ35μ、幅372wIL、長尺方向および幅方
向への伸び率が各々150多および220%、伸び比0
.68、気孔率82%、微細孔の孔径が2.1μである
焼成されたPTFE多孔質シート13(試料番号1)を
得た。Next, this sheet 11 is passed through a pair of pinch rolls 4 of a tenter set stretching device shown in FIG. While maintaining the temperature at 350°C, the rotational speeds of the pinch roll 4 and the pair of pinch rolls 5 on the outlet side are set to be approximately the same, and both ends of the sheet 11 in the width direction are placed outside of both ends of the heating zone 3. Installed chuck 12
The part of the sheet 11 placed inside the heating zone is stretched by 300φ in the width direction (stretching speed 2.7%/5ec).
The thickness is 35 μ, the width is 372 wIL, the elongation rate in the longitudinal direction and the width direction is 150% and 220%, respectively, and the elongation ratio is 0.
.. 68, a fired PTFE porous sheet 13 (sample number 1) having a porosity of 82% and a micropore diameter of 2.1 μm was obtained.
また、これとは別に用いるPTFE未焼成粉末或いは延
伸率を第1表に示すようにする以外は、全て試料番号1
の場合と同様にして試料番号2〜8の焼成されたPTF
E多孔質シートを得た。In addition, except for the unsintered PTFE powder used or the stretching ratio shown in Table 1, all samples were sample number 1.
Calcined PTF of sample numbers 2 to 8 in the same manner as in the case of
E A porous sheet was obtained.
これら、多孔質シートを布状基材と部分接着により積層
せしめた積層シートの耐洗濯性を下記のようにして試験
して得た結果を第1表に示す。Table 1 shows the results obtained by testing the washing resistance of these laminated sheets in which a porous sheet was laminated with a cloth-like base material by partial adhesion as described below.
各多孔質シートの片面に40デニール、28ゲージから
成るナイロン66トリコット基布(無化成工業社製、商
品名レオナ66トリコットハーフ)を粒径0.5 rr
vnのアミド系ホットメルト接着剤(ダイセル工業社製
、商品名ダイアミドT−450)を用いて点状に部分接
着(接着面積30%)せしめて積層シート(45Crn
×45crrl)を得、この積層シートを60番手のポ
リエステル糸により縫製加工し、次いでこの縫製加工品
を洗濯機(日立製作新製、商品名PF2350型)中に
入れ、洗い6分、脱水3分、すすぎ7.5分および脱水
5.5分を1サイクルとして多数回洗濯を繰り返し、多
孔質シートに亀裂が発生するまでのサイクル数を求めた
。On one side of each porous sheet, a 40 denier, 28 gauge nylon 66 tricot base fabric (manufactured by Mukasei Kogyo Co., Ltd., trade name Leona 66 Tricot Half) was coated with a particle size of 0.5 rr.
A laminated sheet (45Crn) was made by partially adhering dots (adhesion area 30%) using vn's amide hot melt adhesive (manufactured by Daicel Industries, Ltd., trade name: Diaamide T-450).
x 45crrl), this laminated sheet was sewn with 60 count polyester thread, and then the sewn product was placed in a washing machine (manufactured by Hitachi Seisakusho, product name PF2350 model), washed for 6 minutes, and dehydrated for 3 minutes. Washing was repeated many times with each cycle consisting of 7.5 minutes of rinsing and 5.5 minutes of dehydration, and the number of cycles until cracks appeared in the porous sheet was determined.
上記実施例および比較例から明らかなように、本発明に
係るPTFE多孔質シートは布状基材と部分接着により
積層せしめることにより耐洗濯性の良好な物品を得るこ
とができ、亀裂が生じ難いことが判る。As is clear from the above Examples and Comparative Examples, the porous PTFE sheet according to the present invention can be laminated with a cloth-like base material by partial adhesion to obtain an article with good washing resistance, and cracks are less likely to occur. I understand that.
第1図および第2図は本発明に係るPTFB多孔質シー
トを製造するのに用いられる延伸装置の例を示す概略図
である。
3・・・・・・加熱ソーン、4,5・・・・・・ビンチ
ロール、13・・・・・・PTFE多孔質シート。FIG. 1 and FIG. 2 are schematic diagrams showing an example of a stretching apparatus used for producing a porous PTFB sheet according to the present invention. 3... Heating sawn, 4, 5... Vinty roll, 13... PTFE porous sheet.
Claims (1)
つ焼成されているポリテトラフルオロエチレン多孔質シ
ートであって、(、)平均分子量が200万以上のポリ
テトラフルオロエチレン粉末かう形成されていること、
(b)各延伸方向における伸び率がいずれも50%以上
であること、および(c)伸び比が0.5以上であるこ
と、を特徴とするポリテトラフルオロエチレン多孔質シ
ート。1. A polytetrafluoroethylene porous sheet that has been made porous by stretching in two mutually orthogonal directions and is fired, the sheet being made of polytetrafluoroethylene powder having an average molecular weight of 2 million or more. Being there,
A polytetrafluoroethylene porous sheet characterized in that (b) the elongation rate in each stretching direction is 50% or more, and (c) the elongation ratio is 0.5 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56155931A JPS5829327B2 (en) | 1981-09-29 | 1981-09-29 | Polytetrafluoroethylene porous sheet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP56155931A JPS5829327B2 (en) | 1981-09-29 | 1981-09-29 | Polytetrafluoroethylene porous sheet |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5855230A JPS5855230A (en) | 1983-04-01 |
JPS5829327B2 true JPS5829327B2 (en) | 1983-06-22 |
Family
ID=15616635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP56155931A Expired JPS5829327B2 (en) | 1981-09-29 | 1981-09-29 | Polytetrafluoroethylene porous sheet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5829327B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017115523A1 (en) | 2015-12-28 | 2017-07-06 | ユニ・チャーム株式会社 | Non-woven fabric for outer covering sheet of absorbent article, and absorbent article which includes said non-woven fabric as outer covering sheet |
US11529267B2 (en) | 2015-12-28 | 2022-12-20 | Unicharm Corporation | Non-woven fabric for liquid-permeable sheet of absorbent article, and absorbent article which includes said non-woven fabric as liquid-permeable sheet |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3171454B2 (en) * | 1991-04-22 | 2001-05-28 | ジャパンゴアテックス株式会社 | Adsorbent filter |
-
1981
- 1981-09-29 JP JP56155931A patent/JPS5829327B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2017115523A1 (en) | 2015-12-28 | 2017-07-06 | ユニ・チャーム株式会社 | Non-woven fabric for outer covering sheet of absorbent article, and absorbent article which includes said non-woven fabric as outer covering sheet |
US11529267B2 (en) | 2015-12-28 | 2022-12-20 | Unicharm Corporation | Non-woven fabric for liquid-permeable sheet of absorbent article, and absorbent article which includes said non-woven fabric as liquid-permeable sheet |
Also Published As
Publication number | Publication date |
---|---|
JPS5855230A (en) | 1983-04-01 |
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