JP2012162089A - Adsorption film and adsorption film with mold release film - Google Patents
Adsorption film and adsorption film with mold release film Download PDFInfo
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本発明は、吸着機を用い、セラミックグリーンシートを吸着して所定位置に搬送し、分離して積層するに際し、吸着機の吸着板とセラミックグリーンシートとの間に介在させる緩衝材に適した、吸着フィルムに関する。また、本発明は、離型フィルム付き吸着フィルムに関する。 The present invention uses an adsorber, adsorbs the ceramic green sheet, conveys it to a predetermined position, and is suitable for a buffer material interposed between the adsorbing plate of the adsorber and the ceramic green sheet when separated and stacked. It relates to an adsorption film. The present invention also relates to an adsorption film with a release film.
携帯電話などに用いられるチップコンデンサーは、電極が印刷されたセラミックグリーンシートを積層して作製される。セラミックグリーンシートを吸着して離型紙から剥がし、同一場所に搬送し、分離して積層するための吸着機には、セラミックグリーンシートをその面全体で吸着するために吸着板が装着される。上記一連の工程を円滑に行うため、吸着板には、表面平滑性、通気性および離型性、さらには適度なクッション性が要求される。吸着板には、通気のための開口部を有する金型が用いられることが多い。しかし、金型はクッション性に欠ける。金型のクッション性を補うためには、その表面に緩衝材を装着するとよい。通気性を保持する観点から、緩衝材としては多孔質シートが望ましい。 A chip capacitor used in a mobile phone or the like is manufactured by laminating ceramic green sheets on which electrodes are printed. A suction plate for attaching the ceramic green sheet to the entire surface thereof is mounted on an adsorption machine for adsorbing the ceramic green sheet and peeling it from the release paper, transporting it to the same place, separating and stacking. In order to smoothly perform the above-described series of steps, the suction plate is required to have surface smoothness, air permeability, mold release property, and appropriate cushioning properties. For the suction plate, a mold having an opening for ventilation is often used. However, the mold lacks cushioning properties. In order to supplement the cushioning properties of the mold, a cushioning material may be attached to the surface. From the viewpoint of maintaining air permeability, a porous sheet is desirable as the cushioning material.
特許文献１には、セラミックグリーンシートではなくガラス板を対象としているものの、支持台上への被加工体の吸着のために用いる多孔質シートが開示されている。特許文献１によると、多孔質シートの片面に部分的に接着剤層を設けておけば、支持台上へのガラス板の配置が容易となるばかりでなく、その後の位置ズレをより確実に防止できる（段落００２５）。接着剤層の材料としては、感圧性接着剤が好ましいが、ホットメルト接着剤や熱硬化型接着剤を用いることもできる（段落００２５）。 Patent Document 1 discloses a porous sheet used for adsorbing a workpiece on a support table, although it is intended for a glass plate instead of a ceramic green sheet. According to Patent Document 1, if the adhesive layer is partially provided on one side of the porous sheet, not only the glass plate can be easily placed on the support base, but also the positional displacement can be prevented more reliably. Yes (paragraph 0025). The material of the adhesive layer is preferably a pressure sensitive adhesive, but a hot melt adhesive or a thermosetting adhesive can also be used (paragraph 0025).
セラミックグリーンシート吸着用の金型上に配置する多孔質シートの表面にも、予め接着剤を塗布して粘着剤層を形成しておくと便利である。この場合、金型の開口部を通じてセラミックグリーンシートを吸引するときには、多孔質シートの孔部に対応する部分において粘着剤を除去し、貫通孔を形成する必要がある。これを考慮すると、粘着剤層は薄いほうがよい。薄い粘着剤層を形成するためには、加熱して粘度を低下させたホットメルト接着剤を塗布するとよい。 It is convenient to form a pressure-sensitive adhesive layer in advance by applying an adhesive to the surface of the porous sheet placed on the ceramic green sheet adsorption die. In this case, when the ceramic green sheet is sucked through the opening of the mold, it is necessary to remove the adhesive at a portion corresponding to the hole of the porous sheet to form a through hole. In consideration of this, the adhesive layer should be thin. In order to form a thin pressure-sensitive adhesive layer, it is preferable to apply a hot melt adhesive whose viscosity is reduced by heating.
他方、多孔質シートに吸着したセラミックグリーンシートを分離するためには、金型の開口部を通じてセラミックグリーンシートに排圧を印加する必要がある。このため、金型と多孔質シートとの間には排圧に負けない粘着力が要求される。したがって、セラミックグリーンシートの吸着に用いる多孔質シートの表面には、粘着力に優れた粘着剤層を形成することが望まれる。 On the other hand, in order to separate the ceramic green sheet adsorbed on the porous sheet, it is necessary to apply an exhaust pressure to the ceramic green sheet through the opening of the mold. For this reason, the adhesive force which does not lose to exhaust pressure is requested | required between a metal mold | die and a porous sheet. Therefore, it is desired to form an adhesive layer having excellent adhesive force on the surface of the porous sheet used for adsorbing the ceramic green sheet.
しかし、図６に示すように、多孔質シート１３上に加熱したホットメルト接着剤１２を直接塗布すると、多孔質シート１３の孔部１９にホットメルト接着剤１２が入り込んでしまう。このため、ホットメルト接着剤１２を厚く塗布しないと、ホットメルト接着剤１２が孔部１９に陥没し、ホットメルト接着剤１２と金型１６との接触面積が小さくなり、十分な粘着力が得られない。 However, as shown in FIG. 6, when the heated hot melt adhesive 12 is directly applied onto the porous sheet 13, the hot melt adhesive 12 enters the hole 19 of the porous sheet 13. For this reason, if the hot melt adhesive 12 is not applied thickly, the hot melt adhesive 12 sinks into the hole 19, the contact area between the hot melt adhesive 12 and the mold 16 is reduced, and sufficient adhesive strength is obtained. I can't.
接着力を確保するために十分な量のホットメルト接着剤１２を塗布すると、多孔質シート１３の通気性の確保が困難となる。すなわち、多孔質シート１３にセラミックグリーンシート１７を吸着させるために、金型１６の開口部１６ａを通じて吸引を開始しても（図６矢印参照）、多孔質シート１３の孔部１９にホットメルト接着剤１２が残りやすく、吸着フィルム２０に十分な数の貫通孔１８が形成されない。吸着フィルム２０の通気性が低いと、吸着機による減圧の程度を引き上げてセラミックグリーンシート１７を強く吸引しなければならない。しかし、強く吸引すると、セラミックグリーンシート１７の変形が生じやすくなる。セラミックグリーンシート１７に変形が生じれば、セラミックグリーンシート１７の積層体において上層の電極層と下層の電極層とが短絡し、チップコンデンサーの容量が低下するおそれが生じる。 When a sufficient amount of hot melt adhesive 12 is applied to ensure adhesive strength, it is difficult to ensure the breathability of the porous sheet 13. That is, in order to adsorb the ceramic green sheet 17 to the porous sheet 13, even if suction is started through the opening 16 a of the mold 16 (see the arrow in FIG. 6), hot melt bonding is performed on the hole 19 of the porous sheet 13. The agent 12 tends to remain, and a sufficient number of through holes 18 are not formed in the adsorption film 20. If the air permeability of the adsorbing film 20 is low, the ceramic green sheet 17 must be strongly sucked by raising the degree of decompression by the adsorber. However, strong suction tends to cause deformation of the ceramic green sheet 17. If the ceramic green sheet 17 is deformed, the upper electrode layer and the lower electrode layer in the laminated body of the ceramic green sheets 17 are short-circuited, which may reduce the capacity of the chip capacitor.
以上の事情を鑑み、本発明は、セラミックグリーンシートのように変形しやすい板状の被吸着体を吸着する際に、金型などの吸着板に装着すべき緩衝材に適した吸着フィルム、特に、粘着力および通気性に優れた吸着フィルムを提供し、さらには離型フィルム付き吸着フィルムを提供することを目的とする。 In view of the above circumstances, the present invention is an adsorption film suitable for a cushioning material to be attached to an adsorption plate such as a mold when adsorbing a plate-like adsorbent that is easily deformed, such as a ceramic green sheet. An object of the present invention is to provide an adsorption film excellent in adhesive strength and air permeability, and further to provide an adsorption film with a release film.
本発明者は、所定温度に加熱したホットメルト接着剤を離型フィルム上に塗布し、前記離型フィルム上における前記ホットメルト接着剤が前記所定温度よりも低い温度となった状態で当該ホットメルト接着剤に多孔質シートを接合して、前記離型フィルム、前記ホットメルト接着剤からなる粘着剤層、および前記多孔質シートがこの順に積層されてなる積層体を形成し、前記積層体から前記離型フィルムを剥離させて前記粘着剤層と前記多孔質シートとが積層されてなる吸着フィルムを得る、吸着フィルムの製造方法を見出した。 The present inventor applied a hot melt adhesive heated to a predetermined temperature on a release film, and the hot melt adhesive on the release film was at a temperature lower than the predetermined temperature. A porous sheet is bonded to the adhesive to form a laminate in which the release film, the pressure-sensitive adhesive layer made of the hot-melt adhesive, and the porous sheet are laminated in this order, and from the laminate The present inventors have found a method for producing an adsorption film, in which a release film is peeled to obtain an adsorption film in which the pressure-sensitive adhesive layer and the porous sheet are laminated.
本発明は、ホットメルト接着剤からなる粘着剤層と多孔質シートとが積層されてなり、前記粘着剤層についての対ステンレス接着力試験による接着力が０．８Ｎ／２５ｍｍ以上であり、通気度が５ｃｍ3／ｃｍ2・秒以上である吸着フィルムを提供する。ただし、前記対ステンレス接着力試験は、ＪＩＳ Ｚ０２３７に規定された１８０度ひきはがし法に基づいて行い、前記通気度は、ＪＩＳ Ｌ１０９６に規定されたフラジール法により測定して定めるものとする。 In the present invention, a pressure-sensitive adhesive layer made of a hot-melt adhesive and a porous sheet are laminated, and the adhesive strength of the pressure-sensitive adhesive layer according to a stainless steel adhesion test is 0.8 N / 25 mm or more, and the air permeability An adsorption film having a thickness of 5 cm 3 / cm 2 · sec or more is provided. However, the stainless steel adhesive strength test is performed based on the 180 degree peeling method defined in JIS Z0237, and the air permeability is measured and determined by the Frazier method defined in JIS L1096.
また、本発明者は、所定温度に加熱したホットメルト接着剤を離型フィルム上に塗布し、前記離型フィルム上における前記ホットメルト接着剤が前記所定温度よりも低い温度となった状態で当該ホットメルト接着剤に多孔質シートを接合して、前記離型フィルム、前記ホットメルト接着剤からなる粘着剤層、および前記多孔質シートがこの順に積層されてなり、前記粘着剤層と前記多孔質シートとからなる吸着フィルムから前記離型フィルムが剥離可能な、離型フィルム付き吸着フィルムを得る、離型フィルム付き吸着フィルムの製造方法を見出した。 In addition, the inventor applied a hot melt adhesive heated to a predetermined temperature on a release film, and the hot melt adhesive on the release film was in a state where the temperature was lower than the predetermined temperature. A porous sheet is joined to a hot-melt adhesive, and the release film, the pressure-sensitive adhesive layer made of the hot-melt adhesive, and the porous sheet are laminated in this order, and the pressure-sensitive adhesive layer and the porous The manufacturing method of the adsorption film with a release film which obtains the adsorption film with a release film which can peel the said release film from the adsorption film which consists of a sheet | seat was discovered.
また、本発明は、離型フィルム、ホットメルト接着剤からなる粘着剤層、および多孔質シートがこの順に積層されてなり、前記粘着剤層と前記多孔質シートとからなる吸着フィルムから前記離型フィルムが剥離可能な、離型フィルム付き吸着フィルムであって、前記離型フィルムを剥離させて得た前記吸着フィルムについて、前記粘着剤層についての対ステンレス接着力試験による接着力が０．８Ｎ／２５ｍｍ以上であり、通気度が５ｃｍ3／ｃｍ2・秒以上である吸着フィルムを提供する。ただし、前記対ステンレス接着力試験および前記通気度の測定は、上記に基づいて行う。 In the present invention, a release film, a pressure-sensitive adhesive layer made of a hot melt adhesive, and a porous sheet are laminated in this order, and the mold release from the adsorption film made of the pressure-sensitive adhesive layer and the porous sheet. An adhesive film with a release film that can be peeled off, wherein the adhesive film obtained by peeling the release film has an adhesive strength of 0.8 N / Provided is an adsorption film having a permeability of 25 cm or more and an air permeability of 5 cm 3 / cm 2 · sec or more. However, the test for adhesion to stainless steel and the measurement of the air permeability are performed based on the above.
本発明者が見出した吸着フィルムの製造方法では、加熱して粘度を低下させたホットメルト接着剤を離型フィルム上に塗布して薄く平坦な粘着剤層を形成し、その後に低温となって粘度が上昇した粘着剤層を多孔質シートと貼り合わせることとした。このため、ホットメルト接着剤を多孔質シート上に直接塗布した場合と比較して、多孔質シートの孔部へのホットメルト接着剤の入り込みを抑制できる。しかも、上記方法により形成した粘着剤層における粘着面、即ち離型フィルムを剥離させて表れる表面、は平坦性が高い。したがって、本発明の吸着フィルムは、通気性を確保するために薄く形成しても、粘着剤層による粘着力が低下しにくい。 In the manufacturing method of the adsorption film found by the present inventors, a hot-melt adhesive whose viscosity is reduced by heating is applied on the release film to form a thin and flat pressure-sensitive adhesive layer, and then the temperature becomes low. The pressure-sensitive adhesive layer having an increased viscosity was bonded to the porous sheet. For this reason, compared with the case where a hot-melt-adhesive is apply | coated directly on a porous sheet, the penetration | invasion of the hot-melt-adhesive into the hole of a porous sheet can be suppressed. And the adhesive surface in the adhesive layer formed by the said method, ie, the surface which appears by peeling a release film, has high flatness. Therefore, even if the adsorptive film of the present invention is formed thin in order to ensure air permeability, the adhesive force due to the adhesive layer is hardly reduced.
以下、図面を参照しながら本発明の好ましい実施形態について説明する。まず、図１に示す離型フィルム１上にホットメルト接着剤を塗布して粘着剤層２を形成する（図２）。離型フィルム１は、ホットメルト接着剤を塗布するための平坦な表面を提供する。離型フィルム１は、特に限定されないが、シリコーン、ポリエチレンテレフタラートなどの樹脂フィルムを用いるとよい。離型フィルム１は、使用時には除去するため、非多孔性であってよい。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, a hot melt adhesive is applied on the release film 1 shown in FIG. 1 to form the pressure-sensitive adhesive layer 2 (FIG. 2). The release film 1 provides a flat surface for applying a hot melt adhesive. The release film 1 is not particularly limited, but a resin film such as silicone or polyethylene terephthalate may be used. Since the release film 1 is removed at the time of use, it may be non-porous.
ホットメルト接着剤は、加熱された溶融状態で塗布され、冷えると固まって粘着剤層２を形成する。ホットメルト接着剤は、特に限定されないが、常温で十分なタック（粘着性）を示すものを用いるとよい。例えば、ホットメルト接着剤は、高温（１７０〜２００℃）、高圧（２〜５ｋｇ／ｃｍ2）で吹き付けて塗布する。上記程度に加熱して塗布すると、離型フィルム１上に、厚さが均一な粘着剤層２を形成することが容易となる。また例えば、ホットメルト接着剤は、離型フィルム１上に、部分的に、例えば網目状または散点状に、塗布し、その後、押圧して全体に押し広げてもよい。この場合、ホットメルト接着剤は、網目などを構成する線条の径（または散点を構成するドットの径）が５〜３０μｍ、線条（またはドット）の間隔が５〜１００μｍとなる程度に微細なパターンを描くように塗布するとよい。 The hot melt adhesive is applied in a heated and melted state and hardens when cooled to form the pressure-sensitive adhesive layer 2. The hot melt adhesive is not particularly limited, but a hot melt adhesive that exhibits sufficient tack (adhesiveness) at room temperature may be used. For example, the hot melt adhesive is applied by spraying at a high temperature (170 to 200 ° C.) and a high pressure (2 to 5 kg / cm 2 ). When heated and applied to the above extent, it becomes easy to form the pressure-sensitive adhesive layer 2 having a uniform thickness on the release film 1. Further, for example, the hot melt adhesive may be applied partially on the release film 1, for example, in a mesh shape or a dotted shape, and then pressed to spread the whole. In this case, in the hot melt adhesive, the diameter of the filaments constituting the mesh (or the diameter of the dots constituting the dots) is 5 to 30 μm, and the interval between the stripes (or dots) is 5 to 100 μm. It is good to apply so as to draw a fine pattern.
ホットメルト接着剤は、粘着剤層２の厚さが３〜１０μｍとなるように塗布することが好ましい。粘着剤層は、薄すぎると金型に対する粘着力が不足することがあり、厚すぎると吸引時に貫通孔が形成されにくくなる。 The hot melt adhesive is preferably applied so that the pressure-sensitive adhesive layer 2 has a thickness of 3 to 10 μm. If the pressure-sensitive adhesive layer is too thin, the adhesive force to the mold may be insufficient, and if it is too thick, it is difficult to form a through hole during suction.
次に、図３に示すように、粘着剤層２に多孔質シート３を貼り合わせて離型フィルム付き吸着フィルム４を得る。粘着剤層２に多孔質シート３を貼り合わせる方法は、特に限定されないが、例えば、粘着剤層２を形成した離型フィルム１と多孔質シート３とを、一対のロールの間を通過させることにより貼り付けるとよい。このとき、粘着剤層２を構成するホットメルト接着剤は、既に冷却されて粘度が増し、離型フィルム１の一主面に沿って固定されているので、多孔質シート３の孔部９に入り込みにくい。 Next, as shown in FIG. 3, the porous sheet 3 is bonded to the pressure-sensitive adhesive layer 2 to obtain an adsorption film 4 with a release film. The method for attaching the porous sheet 3 to the pressure-sensitive adhesive layer 2 is not particularly limited. For example, the release film 1 on which the pressure-sensitive adhesive layer 2 is formed and the porous sheet 3 are passed between a pair of rolls. It is good to paste by. At this time, since the hot melt adhesive constituting the pressure-sensitive adhesive layer 2 has already been cooled to increase the viscosity and is fixed along one main surface of the release film 1, the hot melt adhesive is fixed to the hole 9 of the porous sheet 3. Hard to get in.
図４に示すように、図３の離型フィルム付き吸着フィルム４から離型フィルム１を剥離させると吸着フィルム５が得られる。離型フィルム１の剥離により、粘着剤層２は、離型フィルム１から多孔質シート３へと転写される。離型フィルム１に接していた粘着剤層２の面２ａは、平坦性が良好な粘着面２ａとなる。 As shown in FIG. 4, when the release film 1 is peeled off from the adsorption film 4 with the release film of FIG. 3, an adsorption film 5 is obtained. By releasing the release film 1, the pressure-sensitive adhesive layer 2 is transferred from the release film 1 to the porous sheet 3. The surface 2a of the pressure-sensitive adhesive layer 2 that has been in contact with the release film 1 becomes the pressure-sensitive adhesive surface 2a with good flatness.
多孔質シート３としては、樹脂多孔質シート、特に超高分子量ポリエチレン樹脂多孔質シートが好ましい。超高分子量ポリエチレン樹脂多孔質シートは、ゴムシートに比べて摩擦係数が低く、紙や不織布に比べて寿命が長い。超高分子量ポリエチレンは、約１００万以上の分子量（粘度平均分子量）を有する。 The porous sheet 3 is preferably a resin porous sheet, particularly an ultrahigh molecular weight polyethylene resin porous sheet. The ultra-high molecular weight polyethylene resin porous sheet has a lower coefficient of friction than a rubber sheet and has a longer life than paper or non-woven fabric. Ultra high molecular weight polyethylene has a molecular weight (viscosity average molecular weight) of about 1 million or more.
超高分子量ポリエチレン樹脂多孔質シートは、特に限定されないが、厚さが０．０５〜０．５ｍｍ、特に１００〜３００μｍ、平均孔径が１〜１００μｍ、特に５〜４０μｍ、算術平均粗さ（Ｒａ）が０．５〜１．２μｍ、圧縮弾性率（ＪＩＳ Ｋ７１８１）が１００〜１０００ｋｇｆ／ｍ2、特に２００〜４００ｋｇｆ／ｍ2、通気度（フラジール法（ＪＩＳ Ｌ１０９６）による）が５〜２０ｃｍ3／ｃｍ2・秒であることが好ましい。 Although the ultrahigh molecular weight polyethylene resin porous sheet is not particularly limited, the thickness is 0.05 to 0.5 mm, particularly 100 to 300 μm, the average pore diameter is 1 to 100 μm, particularly 5 to 40 μm, and the arithmetic average roughness (Ra). Is 0.5 to 1.2 μm, compression modulus (JIS K7181) is 100 to 1000 kgf / m 2 , particularly 200 to 400 kgf / m 2 , and air permeability (according to Frazier method (JIS L1096)) is 5 to 20 cm 3 / cm. 2 · sec is preferred.
図５に、吸着機の吸着板である金型６に吸着フィルム５を装着した状態を示す。吸着フィルム５は、粘着剤層２を金型６の表面に接着して固定される。吸着フィルム５の多孔質シート３は搬送するべきセラミックグリーンシート７に押し当てられる。この状態で、金型６の開口部６ａから吸引を開始すると（図５矢印参照）、多孔質シート５の孔部９の上方において粘着剤層２の一部が除去され、吸着フィルム５に貫通孔８が形成される。そして、貫通孔８を介してセラミックグリーンシート７が吸引される。こうして、セラミックグリーンシート７は、金型６に吸着されて所定の場所へと搬送され、その場所で開口部６ａから印加される排圧（図５矢印の逆方向への圧力印加）によって金型６から分離する。 FIG. 5 shows a state in which the adsorption film 5 is mounted on a mold 6 that is an adsorption plate of the adsorption machine. The adsorption film 5 is fixed by adhering the pressure-sensitive adhesive layer 2 to the surface of the mold 6. The porous sheet 3 of the adsorption film 5 is pressed against the ceramic green sheet 7 to be conveyed. In this state, when suction is started from the opening 6a of the mold 6 (see the arrow in FIG. 5), a part of the adhesive layer 2 is removed above the hole 9 of the porous sheet 5 and penetrates the adsorption film 5. A hole 8 is formed. Then, the ceramic green sheet 7 is sucked through the through hole 8. In this way, the ceramic green sheet 7 is attracted to the mold 6 and conveyed to a predetermined place, and the mold is applied by the exhaust pressure (pressure application in the direction opposite to the arrow in FIG. 5) applied from the opening 6a at that place. Separate from 6.
吸着フィルム５では、粘着剤層２の金型６に接する粘着面２ａは平坦性が高い。このため、粘着剤層２を過度に厚く形成しなくても、金型６との間に十分な粘着力を確保できる。したがって、セラミックグリーンシート７を分離するために排圧を印加しても、吸着フィルム５が金型６から剥離することがない。 In the adsorption film 5, the pressure-sensitive adhesive surface 2a in contact with the mold 6 of the pressure-sensitive adhesive layer 2 has high flatness. For this reason, even if it does not form the adhesive layer 2 too thickly, sufficient adhesive force can be ensured between the metal molds 6. Therefore, even if the exhaust pressure is applied to separate the ceramic green sheet 7, the adsorption film 5 does not peel from the mold 6.
吸着フィルム５は、対ステンレス接着力試験（ＪＩＳ Ｚ０２３７ １８０度引き剥がし法）において、０．８Ｎ／２５ｍｍ以上、さらには２．０Ｎ／２５ｍｍ以上、の接着力を示すことが好ましい。また、吸着フィルム５は、フラジール法に基づく測定において、５ｃｍ3／ｃｍ2・秒以上、さらには５．５ｃｍ3／ｃｍ2・秒以上、の通気度を示すことが好ましい。 The adsorption film 5 preferably exhibits an adhesive strength of 0.8 N / 25 mm or more, more preferably 2.0 N / 25 mm or more in a stainless steel adhesion test (JIS Z0237 180 degree peeling method). Moreover, it is preferable that the adsorption film 5 exhibits an air permeability of 5 cm 3 / cm 2 · sec or more, more preferably 5.5 cm 3 / cm 2 · sec or more in measurement based on the Frazier method.
以下、実施例により本発明をより具体的に説明する。ただし、本発明が以下の実施例に限定されるわけではない。 Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.
（比較例）
多孔質シートである超高分子量ポリエチレン樹脂多孔質シート（日東電工社製サンマップ；厚さ０．２２ｍｍ、平均孔径２０μｍ、算術平均粗さ（Ｒａ）２．２μｍ、圧縮弾性率３００ｋｇｆ／ｍ2、通気度７ｃｍ3／ｃｍ2・秒）上にホットメルト接着剤（ヤスハラケミカル社製ヒロダイン）を、１９０℃に加熱し、５ｋｇｆ／ｃｍ2の圧力で均一に吹き付けた。吹き付けによる塗布量は、７ｇ／ｍ2とした。こうして形成した粘着剤層の厚さは７〜８μｍとなった。
(Comparative example)
Ultrahigh molecular weight polyethylene resin porous sheet as a porous sheet (Sunmap manufactured by Nitto Denko Corporation; thickness 0.22 mm, average pore diameter 20 μm, arithmetic average roughness (Ra) 2.2 μm, compression modulus 300 kgf / m 2 , A hot melt adhesive (Hirodine manufactured by Yashara Chemical Co., Ltd.) was heated to 190 ° C. on the air permeability of 7 cm 3 / cm 2 · sec) and sprayed uniformly at a pressure of 5 kgf / cm 2 . The coating amount by spraying was 7 g / m 2 . The thickness of the pressure-sensitive adhesive layer thus formed was 7 to 8 μm.
粘着剤層が常温となるまで冷却し、開口を有する金型の表面に粘着剤層を押しつけることにより、吸着フィルムを金型に固定した。さらに、金型の開口部から吸引を開始し、粘着剤層の一部を除去して貫通孔を形成した。貫通孔を形成した後の吸着フィルムを走査型電子顕微鏡で観察した。結果を図７に示す。 The pressure-sensitive adhesive layer was cooled to room temperature, and the pressure-sensitive adhesive layer was pressed against the surface of the mold having openings to fix the adsorption film to the mold. Furthermore, suction was started from the opening of the mold, and a part of the pressure-sensitive adhesive layer was removed to form a through hole. The adsorbed film after forming the through holes was observed with a scanning electron microscope. The results are shown in FIG.
（実施例）
離型フィルム（日東電工社製ＲＴ−７５Ｓ）上に、比較例と同様にして、ホットメルト接着剤（比較例に同じ）を均一に吹き付け、厚さ７〜８μｍの粘着剤層を形成した。
(Example)
On the release film (RT-75S manufactured by Nitto Denko Corporation), a hot melt adhesive (same as in the comparative example) was sprayed uniformly in the same manner as in the comparative example to form an adhesive layer having a thickness of 7 to 8 μm.
粘着剤層が常温となって粘着性（タック）を示すようになってから、多孔質シートである超高分子量ポリエチレン樹脂多孔質シート（日東電工社製サンマップ；比較例に同じ）を粘着剤層に重ね合わせて押圧し、離型フィルム、粘着剤層、多孔質シートがこの順に積層された離型フィルム付き吸着フィルムを得た。 After the pressure-sensitive adhesive layer reaches normal temperature and exhibits tackiness (tack), the porous sheet is a porous sheet of ultrahigh molecular weight polyethylene resin (Sunmap manufactured by Nitto Denko Corporation; the same as the comparative example). The adhering film with a release film in which the release film, the pressure-sensitive adhesive layer, and the porous sheet were laminated in this order was obtained by overlapping and pressing the layers.
次いで、離型フィルム付き吸着フィルムから離型フィルムを剥離させ、粘着剤層を露出させた。この状態で、開口を有する金型の表面に粘着剤層を押しつけることにより、吸着フィルムを金型に固定した。さらに、金型の開口部から吸引を開始し、粘着剤層の一部を除去して貫通孔を形成した。用いた金型および開口部からの吸引の条件は、比較例と同一とした。比較例と同様、貫通孔を形成した後の吸着フィルムを走査型電子顕微鏡で観察した結果を、図８に示す。図７と図８とを比較すると、実施例の吸着フィルムにおいて、より多くの貫通孔が形成されていることがわかる。 Subsequently, the release film was peeled off from the adsorption film with a release film, and the adhesive layer was exposed. In this state, the adsorption film was fixed to the mold by pressing the pressure-sensitive adhesive layer against the surface of the mold having an opening. Furthermore, suction was started from the opening of the mold, and a part of the pressure-sensitive adhesive layer was removed to form a through hole. The mold used and the suction conditions from the opening were the same as in the comparative example. As in the comparative example, FIG. 8 shows the result of observation of the adsorption film after forming the through holes with a scanning electron microscope. When FIG. 7 and FIG. 8 are compared, it can be seen that more through holes are formed in the adsorption film of the example.
実施例および従来例のそれぞれについて、ホットメルト接着剤の塗布量を変化させて吸着フィルムを作製した。そして、これら吸着フィルムについて、粘着剤層の粘着力（対ステンレス接着力）と通気度とを測定した。 About each of an Example and a prior art example, the application quantity of the hot-melt-adhesive was changed, and the adsorption film was produced. And about these adsorption | suction films, the adhesive force (with respect to stainless steel) and air permeability of the adhesive layer were measured.
対ステンレス接着力は、ＪＩＳ Ｚ０２３７ １８０度引き剥がし法に準じて行った。また、通気度の測定は、フラジール法（ＪＩＳ Ｌ１０９６）に準じて行った。 The adhesion to stainless steel was performed according to the JIS Z0237 180 degree peeling method. The air permeability was measured according to the Frazier method (JIS L1096).
接着力の測定結果を図９に示す。通気度の測定結果を図１０に示す。多孔質シートに直接ホットメルト接着剤を塗布した比較例（従来例）では、０．８Ｎ／２５ｍｍ以上の対ステンレス接着力と、５ｃｍ3／ｃｍ2・秒以上の通気度とを両立させることは困難であった。セラミックグリーンシートの搬送には、この程度に接着力と通気度とが両立していることが望ましい。他方、離型フィルム上にホットメルト接着剤を塗布した実施例では、上記の両立が可能となった。図９および図１０より、ホットメルト接着剤の塗布量は、３〜１０ｇ／ｍ2程度が好ましいことがわかる。 The measurement result of adhesive force is shown in FIG. The measurement result of the air permeability is shown in FIG. In the comparative example (conventional example) in which the hot melt adhesive is directly applied to the porous sheet, it is possible to achieve both an adhesive strength to stainless steel of 0.8 N / 25 mm or more and an air permeability of 5 cm 3 / cm 2 · sec or more. It was difficult. For conveying the ceramic green sheet, it is desirable that the adhesive strength and the air permeability are compatible to this extent. On the other hand, in the Example which apply | coated the hot-melt-adhesive on the release film, said compatibility was attained. From FIG. 9 and FIG. 10, the coating amount of the hot melt adhesive, it can be seen that about 3 to 10 g / m 2 is preferred.
本発明の吸着フィルムにより、セラミックグリーンシートを吸着させて離型紙から剥がし、同一場所に搬送した後、分離して積層し、携帯電話などに用いられるチップコンデンサーを作製することが容易になる。 With the adsorption film of the present invention, the ceramic green sheet is adsorbed and peeled off from the release paper, conveyed to the same place, separated and stacked, and it becomes easy to produce a chip capacitor used for a mobile phone or the like.
本発明による吸着フィルムまたは本発明の製造方法により得た吸着フィルムを装着した吸着板に、吸着フィルムに接するようにセラミックグリーンシートを吸着させて搬送し、積層する工程を含む、電子部品（例えばチップコンデンサ）の製造方法、は産業上多大な利用価値を有する。 An electronic component (for example, a chip) including a step of adsorbing a ceramic green sheet to a suction plate mounted with the suction film according to the present invention or the suction film obtained by the manufacturing method of the present invention, and transporting and stacking the ceramic green sheet The manufacturing method of the capacitor) has great utility value in the industry.
１ 離型フィルム
２ 粘着剤層
２ａ 粘着面
３ 多孔質シート
４ 離型フィルム付き吸着フィルム
５ 吸着フィルム
６ 金型
６ａ 金型の開口部
７ セラミックグリーンシート
８ 貫通孔
９ 孔部
DESCRIPTION OF SYMBOLS 1 Release film 2 Adhesive layer 2a Adhesive surface 3 Porous sheet 4 Adsorption film with a release film 5 Adsorption film 6 Mold 6a Mold opening 7 Ceramic green sheet 8 Through-hole 9 Hole
Claims (2)
前記粘着剤層についての対ステンレス接着力試験による接着力が０．８Ｎ／２５ｍｍ以上であり、
通気度が５ｃｍ3／ｃｍ2・秒以上である吸着フィルム。
ただし、前記対ステンレス接着力試験は、ＪＩＳ Ｚ０２３７に規定された１８０度ひきはがし法に基づいて行い、前記通気度は、ＪＩＳ Ｌ１０９６に規定されたフラジール法により測定して定めるものとする。 A pressure-sensitive adhesive layer made of a hot melt adhesive and a porous sheet are laminated,
The adhesive strength by the stainless steel adhesive strength test for the pressure-sensitive adhesive layer is 0.8 N / 25 mm or more,
An adsorption film having an air permeability of 5 cm 3 / cm 2 · sec or more.
However, the stainless steel adhesive strength test is performed based on the 180 degree peeling method defined in JIS Z0237, and the air permeability is measured and determined by the Frazier method defined in JIS L1096.
前記離型フィルムを剥離させて得た前記吸着フィルムについて、
前記粘着剤層についての対ステンレス接着力試験による接着力が０．８Ｎ／２５ｍｍ以上であり、
通気性試験による通気性が５ｃｍ3／ｃｍ2・秒以上である吸着フィルム。
ただし、前記対ステンレス接着力試験は、ＪＩＳ Ｚ０２３７に規定された１８０度ひきはがし法に基づいて行い、前記通気度は、ＪＩＳ Ｌ１０９６に規定されたフラジール法により測定して定めるものとする。 A release film, a pressure-sensitive adhesive layer made of a hot-melt adhesive, and a porous sheet are laminated in this order, and the release film can be peeled from an adsorption film made of the pressure-sensitive adhesive layer and the porous sheet. An adsorption film with a release film,
About the adsorption film obtained by peeling the release film,
The adhesive strength by the stainless steel adhesive strength test for the pressure-sensitive adhesive layer is 0.8 N / 25 mm or more,
An adsorbent film having an air permeability of 5 cm 3 / cm 2 · sec or more according to an air permeability test.
However, the stainless steel adhesive strength test is performed based on the 180 degree peeling method defined in JIS Z0237, and the air permeability is measured and determined by the Frazier method defined in JIS L1096.
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