JP5260466B2 - Paper sheet double feed prevention member - Google Patents
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- JP5260466B2 JP5260466B2 JP2009240634A JP2009240634A JP5260466B2 JP 5260466 B2 JP5260466 B2 JP 5260466B2 JP 2009240634 A JP2009240634 A JP 2009240634A JP 2009240634 A JP2009240634 A JP 2009240634A JP 5260466 B2 JP5260466 B2 JP 5260466B2
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- 230000002265 prevention Effects 0.000 title abstract description 30
- 229920001971 elastomer Polymers 0.000 claims abstract description 98
- 239000000806 elastomer Substances 0.000 claims abstract description 92
- 229920003225 polyurethane elastomer Polymers 0.000 claims abstract description 4
- 230000003405 preventing effect Effects 0.000 claims description 66
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 53
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 53
- 229920006346 thermoplastic polyester elastomer Polymers 0.000 claims description 40
- 239000002245 particle Substances 0.000 claims description 28
- 230000001747 exhibiting effect Effects 0.000 claims 1
- 229920003023 plastic Polymers 0.000 claims 1
- 239000004033 plastic Substances 0.000 claims 1
- 229920002725 thermoplastic elastomer Polymers 0.000 abstract description 10
- 230000000694 effects Effects 0.000 description 25
- 230000000052 comparative effect Effects 0.000 description 16
- 229920000728 polyester Polymers 0.000 description 9
- 229920001169 thermoplastic Polymers 0.000 description 9
- 239000004416 thermosoftening plastic Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 229920002943 EPDM rubber Polymers 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 239000005060 rubber Substances 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 3
- 238000004132 cross linking Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000010191 image analysis Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- -1 polybutylene terephthalate Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 229920000459 Nitrile rubber Polymers 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 2
- 229920006311 Urethane elastomer Polymers 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000002091 elastography Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000000454 talc Substances 0.000 description 2
- 229910052623 talc Inorganic materials 0.000 description 2
- 229920006347 Elastollan Polymers 0.000 description 1
- 239000004277 Ferrous carbonate Substances 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
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- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
Description
本発明は、積み重ねられた複数枚の紙葉類を一枚ずつ分離させて送出するための紙葉類重送防止部材に関するものである。 The present invention relates to a paper sheet multi-feed preventing member for separating and feeding a plurality of stacked paper sheets one by one.
例えば静電式複写機、レーザープリンタ、普通紙ファクシミリ装置、およびこれらの複合機等の画像形成装置の給紙カセットや給紙トレー等には、前記給紙カセット等に積み重ねて収容された紙葉類が誤って２枚以上重なった状態で送出（重送）されるのを防止するための給紙機構が設けられる。前記給紙機構としては、少なくとも外周面をゴム等で形成した給紙ローラと、ばね等の押圧力によって前記給紙ローラの外周面に接触可能に配設された紙葉類重送防止部材とを含むものが一般的である。 For example, paper sheets stacked and stored in the paper feed cassette or the like in an image forming apparatus such as an electrostatic copying machine, a laser printer, a plain paper facsimile machine, or a multifunction machine thereof are stacked. A paper feed mechanism is provided to prevent the paper from being sent out in a state where two or more sheets are mistakenly overlapped (multiple feed). The paper feed mechanism includes a paper feed roller having at least an outer peripheral surface formed of rubber or the like, and a paper sheet multi-feed preventing member disposed so as to be able to contact the outer peripheral surface of the paper feed roller by a pressing force of a spring or the like. It is common to include.
前記給紙機構は、積み重ねられた２枚目以下の紙葉類が誤搬送されるのを、前記紙葉類重送防止部材の摩擦力によって抑制しながら、給紙ローラと接する１枚目の紙葉類のみを、前記給紙ローラの回転によって他の紙葉類から分離して送出する働きをする。
前記紙葉類重送防止部材としては、片面が給紙ローラや紙葉類と接触する接触面とされた平板状に形成された分離パッドや分離シート等が一般的に用いられる（特許文献１等参照）。
The sheet feeding mechanism suppresses the erroneous conveyance of the second and subsequent stacked sheets by the frictional force of the sheet multi-feed preventing member, and makes contact with the sheet feeding roller. Only the paper sheets are separated from the other paper sheets by the rotation of the paper feed roller and sent out.
As the paper sheet multi-feed preventing member, a separation pad, a separation sheet, or the like formed in a flat plate whose one surface is in contact with a paper feed roller or paper sheet is generally used (Patent Document 1). Etc.).
前記分離パッド等の平板状の紙葉類重送防止部材として、従来は、少なくとも前記接触面、好ましくはその全体を、例えばエチレン−プロピレン−ジエンゴム（ＥＰＤＭ）、天然ゴム、ウレタンゴム、クロロプレンゴム、アクリロニトリル−ブタジエンゴム（ＮＢＲ）等のゴムに架橋剤（加硫剤）を配合した組成物を平板状に成形するとともに架橋させてなる架橋物（加硫物）によって形成したものが一般的に用いられてきた。 Conventionally, as the flat sheet paper multifeed preventing member such as the separation pad, at least the contact surface, preferably the entire surface thereof, for example, ethylene-propylene-diene rubber (EPDM), natural rubber, urethane rubber, chloroprene rubber, Generally used is a product obtained by forming a composition in which a crosslinking agent (vulcanizing agent) is blended with a rubber such as acrylonitrile-butadiene rubber (NBR) into a flat plate shape and crosslinking the composition. Has been.
しかし近時、熱可塑性を有するためリサイクル等が容易ないわゆる熱可塑性エラストマを用いて紙葉類重送防止部材を形成することが求められるようになってきている。
前記熱可塑性エラストマからなる紙葉類重送防止部材には、先に説明したように積み重ねられた２枚目以下の紙葉類が誤搬送されるのを摩擦力によって抑制する重送防止効果に優れるだけでなく、給紙ローラや紙葉類との摩擦によってびびり振動して異音を発するいわゆる音鳴きと呼ばれる現象を生じにくいことも求められる。
However, recently, it has been demanded to form a paper sheet multi-feed preventing member using a so-called thermoplastic elastomer which has thermoplasticity and is easy to recycle.
The paper sheet double feed prevention member made of the thermoplastic elastomer has a double feed prevention effect that suppresses erroneous transport of the second and subsequent paper sheets stacked as described above by frictional force. In addition to being excellent, it is also required that a phenomenon called so-called squealing that generates chatter vibrations and generates abnormal noise due to friction with a paper feed roller and paper sheets is not required.
これらの特性に優れた紙葉類重送防止部材を形成しうる熱可塑性エラストマとしては、例えば熱可塑性樹脂や熱可塑性エラストマからなるマトリクス中で、ＥＰＤＭやエチレン−プロピレンゴム（ＥＰＭ）を動的架橋させた複合構造を有するエラストマ、あるいは熱可塑性ポリエステル系エラストマ等が挙げられる。
ところが、これら熱可塑性エラストマからなる紙葉類重送防止部材は、前記ゴムの架橋物からなるものに比べて耐摩耗性が十分でないという問題があった。
As a thermoplastic elastomer capable of forming a paper sheet multi-feed prevention member having excellent characteristics, for example, EPDM or ethylene-propylene rubber (EPM) is dynamically crosslinked in a matrix made of a thermoplastic resin or a thermoplastic elastomer. Examples thereof include an elastomer having a composite structure and a thermoplastic polyester elastomer.
However, the paper sheet multi-feed preventing member made of these thermoplastic elastomers has a problem that the abrasion resistance is not sufficient as compared with the one made of the crosslinked rubber.
本発明の目的は、重送防止効果や音鳴きを防止する効果に優れる上、耐摩耗性にも優れた紙葉類重送防止部材を提供することにある。 It is an object of the present invention to provide a paper sheet multi-feed preventing member that is excellent in the effect of preventing double feeding and preventing noise and has excellent wear resistance.
従来のゴムの架橋物からなる紙葉類重送防止部材であれば、カーボンブラック、シリカ、炭酸カルシウム、タルク等の一般的なフィラーを含有させることで耐摩耗性を向上できる。しかし熱可塑性エラストマは、前記従来のフィラーを含有させても十分な補強効果が得られないことが知られている。
そこで発明者は、熱可塑性エラストマについてさらに検討した結果、エラストマ成分として、熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを所定の割合で配合すると、前記エラストマ成分は、
(1) 前記熱可塑性ポリウレタン系エラストマ中に熱可塑性ポリエステル系エラストマの粒子が微分散した海−島構造、または
(2) 前記熱可塑性ポリエステル系エラストマ中に熱可塑性ポリウレタン系エラストマの粒子が微分散した海−島構造
を呈し、前記両熱可塑性エラストマをそれぞれ単独で用いる場合に比べて、紙葉類重送防止部材の耐摩耗性を向上できる上、前記紙葉類重送防止部材の重送防止効果や音鳴きを抑制する効果をも向上できることを見出した。
If it is a conventional paper sheet multi-feed prevention member made of a crosslinked product of rubber, the wear resistance can be improved by incorporating a general filler such as carbon black, silica, calcium carbonate, talc and the like. However, it is known that a thermoplastic elastomer cannot obtain a sufficient reinforcing effect even when the conventional filler is contained.
Therefore, the inventors have, thermoplastic elastomer Ma to about further study the results, as the elastomer component, when blended with a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer in a predetermined proportion, said elastomeric component,
(1) A sea-island structure in which thermoplastic polyester elastomer particles are finely dispersed in the thermoplastic polyurethane elastomer, or
(2) A sea-island structure in which thermoplastic polyurethane elastomer particles are finely dispersed in the thermoplastic polyester elastomer.
The exhibits, the Ryonetsu thermoplastic elastomer and as compared with the case where each used alone, on which can improve the wear resistance of the paper sheet multi-feed preventing member, multi-feed preventing effect and ringing of the paper sheet multi-feed preventing member It has been found that the effect of suppressing the phenomenon can be improved.
なお熱可塑性ポリウレタン系エラストマは、例えば前記特許文献１の紙葉類重送防止部材のもとになる熱可塑性エラストマにおいて、前記ＥＰＤＭやＥＰＭを動的架橋させるためのマトリクスとして使用されている他、特許文献２ではブタジエンゴムを動的架橋させるためのマトリクスとしても用いられている。さらに特許文献３では、ウレタンゴムの架橋物中に低硬度粒子として微分散させるために用いられている。 The thermoplastic polyurethane elastomer is used as a matrix for dynamically cross-linking the EPDM and EPM in the thermoplastic elastomer used as the paper sheet multi-feed preventing member of Patent Document 1, for example. In Patent Document 2, it is also used as a matrix for dynamically crosslinking butadiene rubber. Furthermore, in Patent Document 3, it is used for fine dispersion as low hardness particles in a crosslinked product of urethane rubber.
しかし、前記いずれかの複合構造を有するエラストマ等を用いて紙葉類重送防止部材を形成したとしても、前記熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用したものと同等の良好な補強効果や重送防止効果、あるいは音鳴きを防止する効果を得ることはできない。
したがって本発明は、紙葉類と接触する接触面を備えた紙葉類重送防止部材であって、少なくとも前記接触面が、熱可塑性ポリウレタン系エラストマと、熱可塑性ポリエステル系エラストマとをエラストマ成分として含有し、前記熱可塑性ポリウレタン系エラストマの、エラストマ成分の総量に占める割合が５質量％以上、９０質量％以下であるとともに、前記エラストマ成分は、
(1) 前記熱可塑性ポリウレタン系エラストマ中に熱可塑性ポリエステル系エラストマの粒子が微分散した海−島構造、または
(2) 前記熱可塑性ポリエステル系エラストマ中に熱可塑性ポリウレタン系エラストマの粒子が微分散した海−島構造
を呈することを特徴とする紙葉類重送防止部材である。
However, the even form one of the composite structure sheet multi-feed preventing member with an elastomer or the like having a good equivalent to that combination of the thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer It is impossible to obtain a reinforcing effect, a multifeed prevention effect, or an effect of preventing noise.
Accordingly, the present invention provides a paper sheet multi-feed preventing member having a contact surface that comes into contact with a paper sheet, and at least the contact surface includes a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer as an elastomer component. And the proportion of the thermoplastic polyurethane elastomer in the total amount of the elastomer component is 5% by mass or more and 90% by mass or less, and the elastomer component is
(1) A sea-island structure in which thermoplastic polyester elastomer particles are finely dispersed in the thermoplastic polyurethane elastomer, or
(2) A sea-island structure in which thermoplastic polyurethane elastomer particles are finely dispersed in the thermoplastic polyester elastomer.
This is a paper sheet multi-feed preventing member.
本発明によれば、重送防止効果や音鳴きを防止する効果に優れる上、耐摩耗性にも優れた紙葉類重送防止部材を提供することができる。 According to the present invention, it is possible to provide a paper sheet multi-feed preventing member that is excellent in a multi-feed preventing effect and an effect of preventing noise and also has excellent wear resistance.
図１は、本発明の紙葉類重送防止部材の、実施の形態の一例を示す斜視図である。また図２は、前記例の紙葉類重送防止部材を組み込んだ給紙機構の一例を示す概略断面図である。
図２を参照して、この例の給紙機構１は、少なくとも外周面２をゴム等によって形成した給紙ローラ３と、図示していないばね等の押圧力によって前記給紙ローラ３の外周面２に接触可能に配設された紙葉類重送防止部材（分離パッド）４とを備えている。
FIG. 1 is a perspective view showing an example of an embodiment of a paper sheet multi-feed preventing member of the present invention. FIG. 2 is a schematic cross-sectional view showing an example of a paper feed mechanism incorporating the paper sheet multi-feed preventing member of the above example.
Referring to FIG. 2, a sheet feeding mechanism 1 of this example includes a sheet feeding roller 3 having at least an outer circumferential surface 2 formed of rubber or the like, and an outer circumferential surface of the sheet feeding roller 3 by a pressing force such as a spring (not shown). 2 and a paper sheet multi-feed preventing member (separation pad) 4 disposed so as to be in contact with each other.
前記紙葉類重送防止部材４は、この例では矩形平板状に形成され、その片面である図において上側の面（接触面）５を露出させた状態で支持台６によって保持されている。そして前記接触面５を給紙ローラ３の外周面２に対向させた状態で、前記支持台６を、図示していないばね等によって図中に白抜きの矢印で示すように外周面２の方向に押圧させることで、前記接触面５が外周面２に所定の圧接力で接触可能とされている。 In this example, the paper sheet multi-feed preventing member 4 is formed in a rectangular flat plate shape, and is held by a support base 6 with an upper surface (contact surface) 5 exposed in the figure which is one side thereof. Then, with the contact surface 5 facing the outer peripheral surface 2 of the paper feed roller 3, the support 6 is moved in the direction of the outer peripheral surface 2 by a spring or the like (not shown) as indicated by a white arrow in the figure. The contact surface 5 can be brought into contact with the outer peripheral surface 2 with a predetermined pressure contact force.
前記給紙機構１は、画像形成装置の給紙カセットや給紙トレー等に積み重ねて収容された複数枚の紙葉類７のうち２枚目以下の紙葉類７の搬送を、前記紙葉類重送防止部材４の接触面５との摩擦力によって抑制しながら、給紙ローラ３と接する１枚目の紙葉類７のみを、前記給紙ローラ３の、図中に一点鎖線の矢印で示す方向への回転に伴って他の紙葉類７から分離して、図中に実線の矢印で示すように画像形成装置の内部に送出する働きをする。 The paper feed mechanism 1 conveys the second and subsequent paper sheets 7 out of a plurality of paper sheets 7 stacked and accommodated in a paper feed cassette or a paper feed tray of the image forming apparatus. Only the first sheet 7 in contact with the paper feed roller 3 is suppressed by the frictional force with the contact surface 5 of the double feed prevention member 4, and the one-dot chain line arrow in the drawing of the paper feed roller 3. The paper sheet 7 is separated from the other paper sheets 7 as it is rotated in the direction indicated by, and is sent out to the inside of the image forming apparatus as indicated by solid arrows in the drawing.
図１を参照して、この例の紙葉類重送防止部材４は、全体が熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとをエラストマ成分として含む組成物によって前記矩形平板状に一体形成されている。
前記のうち熱可塑性ポリウレタン系エラストマとしては、ポリウレタン構造を有するハードセグメントと、ポリエステルまたはポリエーテル構造を有するソフトセグメントとを含む種々の熱可塑性ポリウレタン系エラストマの１種または２種以上が挙げられる。
Referring to FIG. 1, preventing member 4 paper sheet multi-feed in this example, the whole is integrally formed on the rectangular flat plate with a composition comprising a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer as the elastomer component ing.
As the out thermoplastic polyurethane elastomer, a hard segment having a polyurethane structure include one or more of a variety of thermoplastic polyurethane elastomers containing a soft segment having a polyester or polyether structure.
また熱可塑性ポリエステル系エラストマとしては、例えばハードセグメントとして高融点で高結晶性の芳香族ポリエステル（ポリブチレンテレフタレート等）、ソフトセグメントとしてガラス転移温度が−７０℃以下程度の非晶性ポリエーテル（ポリテトラメチレンエーテルグリコール等）を含むマルチブロックポリマー等の、種々の熱可塑性ポリエステル系エラストマの１種または２種以上が挙げられる。 The thermoplastic polyester elastomer includes, for example, a high melting point and high crystalline aromatic polyester (polybutylene terephthalate, etc.) as a hard segment, and an amorphous polyether (polyester) having a glass transition temperature of about −70 ° C. or less as a soft segment. 1 type or 2 types or more of various thermoplastic polyester type elastomers, such as a multiblock polymer containing tetramethylene ether glycol etc.) are mentioned.
エラストマ成分には、主に紙葉類重送防止部材４のゴム硬さ等を調整するために、例えばカーボンブラック、シリカ、炭酸カルシウム、タルク等の一般的なフィラーを含有させても良い。
本発明では、エラストマ成分の総量、すなわち熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマの合計量に占める熱可塑性ポリウレタン系エラストマの割合が、先に説明したように５質量％以上、９０質量％以下である必要がある。
The elastomer component may contain a general filler such as carbon black, silica, calcium carbonate, talc, etc., mainly for adjusting the rubber hardness of the paper sheet multi-feed preventing member 4.
In the present invention, the total amount of the elastomer component, i.e. the ratio of the thermoplastic polyurethane elastomer to the total weight of the thermoplastic polyurethane elastomers and thermoplastic polyester elastography Ma is, as previously described 5 wt% or more, 90 wt% Must be:
熱可塑性ポリウレタン系エラストマの含有割合が前記範囲未満では、前記熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用することによる、先に説明した、紙葉類重送防止部材４の重送防止効果や耐摩耗性を向上する効果が得られない。一方、前記範囲を超えてもそれ以上の効果が得られないだけでなく、音鳴きを防止する効果が低下してしまう。
なお前記熱可塑性ポリウレタン系エラストマの割合は、重送防止効果や耐摩耗性をさらに向上することを考慮すると、前記範囲内でも２０質量％以上であるのが好ましい。また音鳴きを防止する効果をさらに向上することを考慮すると、８０質量％以下であるのが好ましい。
The content of the thermoplastic polyurethane elastomer is less than the above range, due to combination with the thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer, previously described, double feed of the sheets multi-feed preventing member 4 prevents The effect and the effect which improves abrasion resistance are not acquired. On the other hand, not only can the effect not be obtained even if it exceeds the above range, but the effect of preventing sounding will be reduced.
The ratio of the thermoplastic polyurethane-based elastomer is preferably 20% by mass or more even within the above range in consideration of further improving the multifeed prevention effect and wear resistance. In consideration of further improving the effect of preventing noise, it is preferably 80 % by mass or less.
前記熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマは、
(1) 熱可塑性ポリウレタン系エラストマ中に熱可塑性ポリエステル系エラストマの粒子が微分散した海−島構造、または
(2) 熱可塑性ポリエステル系エラストマ中に熱可塑性ポリウレタン系エラストマの粒子が微分散した海−島構造
のいずれかのモルフォロジーを呈する。
The thermoplastic polyurethane elastomer and a thermoplastic polyester elastography Ma,
(1) A sea-island structure in which thermoplastic polyester elastomer particles are finely dispersed in a thermoplastic polyurethane elastomer, or
To coloration one of the morphology of the island structure - (2) particles of a thermoplastic polyurethane elastomer finely dispersed sea thermoplastic polyester in elastomer.
また前記(1)(2)の海−島構造において島に相当するエラストマの粒子の粒径は１μｍ以下であるのが好ましい。海−島構造の島の粒径が前記範囲を超える場合には前記効果、すなわち紙葉類重送防止部材４の重送防止効果や音鳴きを防止する効果を向上するとともに耐摩耗性を向上する効果が十分に得られないおそれがある。
なお前記粒子の粒径を、本発明では、走査型プローブ顕微鏡（Scanning Probe Microscope：ＳＰＭ）を用いて撮影したエラストマ成分のＤＦＭ（位相）モルフォロジーを示す画像を画像解析して求めた値でもって表すこととする。
In the sea-island structure of (1) and (2), the particle size of the elastomer particles corresponding to the islands is preferably 1 μm or less. When the particle size of the island of the sea-island structure exceeds the above range, the above effect, that is, the double feed prevention effect of the paper sheet multifeed prevention member 4 and the effect of preventing noises are improved and the wear resistance is improved. There is a possibility that the effect to do is not sufficiently obtained.
In the present invention, the particle size of the particles is represented by a value obtained by image analysis of an image showing a DFM (phase) morphology of an elastomer component photographed using a scanning probe microscope (SPM). I will do it.
エラストマ成分に前記(1)(2)のいずれかの海−島構造を導入するためには、例えば前記２種のエラストマと、必要に応じてフィラー等とを所定の割合で配合した混合物を、例えば２軸押出機等を用いて加熱下で混練すればよい。
エラストマ成分が(1)(2)のいずれの海−島構造を呈するかは、主に熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマの体積比率に応じて異なる。すなわち一般的には、体積比率の多い成分からなる海の中に、体積比率の少ない成分が島として微分散されて海−島構造が形成される。
In order to introduce the sea-island structure of any one of the above (1) and (2) into the elastomer component, for example, a mixture in which the two types of elastomers and, if necessary, a filler or the like are blended at a predetermined ratio, For example, what is necessary is just to knead under heating using a twin screw extruder.
Any sea elastomer component (1) (2) - is either exhibits island structure varies mainly depending on the volume ratio of the thermoplastic polyurethane elastomers and thermoplastic polyester elastomers. That is, generally, a sea-island structure is formed by finely dispersing components having a small volume ratio as islands in the sea composed of components having a high volume ratio.
エラストマ成分に前記(1)(2)のいずれかの海−島構造を導入することにより、紙葉類重送防止部材４のさらなる性能改善を図ることができる。
例えばエラストマ成分を体積比率で熱可塑性ポリエステル系エラストマリッチの配合として、エラストマ成分を、前記(2)の熱可塑性ポリエステル系エラストマ中に熱可塑性ポリウレタン系エラストマの粒子が微分散した海−島構造とすると、前記熱可塑性ポリウレタン系エラストマ等のポリウレタン類が一般的に音鳴きを防止する効果の点で不利とされているにも拘らず、紙葉類重送防止部材４の重送防止効果や耐摩耗性を維持しながら、音鳴きを防止する効果を向上して、これら特性の良好なバランスを取ることができる。
By introducing the sea-island structure of any one of the above (1) and (2) into the elastomer component, the performance of the paper sheet multi-feed preventing member 4 can be further improved.
For example, when the elastomer component is blended with a thermoplastic polyester elastomer rich in a volume ratio, the elastomer component has a sea-island structure in which thermoplastic polyurethane elastomer particles are finely dispersed in the thermoplastic polyester elastomer of (2). Despite the fact that polyurethanes such as the thermoplastic polyurethane elastomers are generally disadvantageous in terms of the effect of preventing sound noise, the double feed prevention effect and wear resistance of the paper sheet double feed prevention member 4 While maintaining the characteristics, it is possible to improve the effect of preventing squealing and to balance these characteristics well.
また熱可塑性ポリウレタン系エラストマリッチの配合として、前記(1)の熱可塑性ポリウレタン系エラストマ中に熱可塑性ポリエステル系エラストマの粒子が微分散した海−島構造とすると、紙葉類重送防止部材４の音鳴き性能を許容範囲に維持しながら、重送防止効果や耐摩耗性を飛躍的に向上させることができる。
紙葉類重送防止部材４は、熱可塑性ポリウレタン系エラストマ、および熱可塑性ポリエステル系エラストマと、必要に応じてフィラー等とを所定の割合で配合し、先に説明したように２軸押出機等を用いて加熱下で混練したのち成形することで製造される。
Further, when the thermoplastic polyurethane elastomer rich composition is a sea-island structure in which thermoplastic polyester elastomer particles (1) are finely dispersed in the thermoplastic polyurethane elastomer, the paper sheet multi-feed prevention member 4 While maintaining the squealing performance within an allowable range, the double feed prevention effect and wear resistance can be dramatically improved.
The paper sheet multi-feed preventing member 4 comprises a thermoplastic polyurethane elastomer , a thermoplastic polyester elastomer , and a filler, etc., if necessary, in a predetermined ratio. As described above, a twin screw extruder or the like It is manufactured by molding after kneading under heating.
紙葉類重送防止部材４を図１に示す矩形平板状に成形するためには、前記混練物を板状ないしはシート状に成形したのち所定の平面形状（矩形状）となるように切り出したり、前記混練物をあらかじめ型内に充てんする等して矩形平板状に成形したりすればよい。
紙葉類重送防止部材４は、研磨処理等を施して所定の表面粗さ、および厚みに調整してもよい。
In order to form the paper sheet multi-feed preventing member 4 into the rectangular flat plate shape shown in FIG. 1, the kneaded material is formed into a plate shape or a sheet shape and then cut into a predetermined planar shape (rectangular shape). The kneaded material may be formed into a rectangular flat plate shape by, for example, prefilling the mold.
The paper sheet multi-feed preventing member 4 may be adjusted to a predetermined surface roughness and thickness by performing a polishing process or the like.
紙葉類重送防止部材４の厚みは、給紙機構１に組み込むことを考慮すると、従来のものと同等程度であるのが好ましい。給紙機構１の構造や、前記給紙機構１を組み込む画像形成装置の構造等によっても異なるが、厚みは０．２ｍｍ以上、特に０．４ｍｍ以上であるのが好ましく、４ｍｍ以下、特に３．５ｍｍ以下であるのが好ましい。
また紙葉類重送防止部材４の硬さは、日本工業規格ＪＩＳ Ｋ６２５３:２００６「加硫ゴム及び熱可塑性ゴム−硬さの求め方」に規定された測定方法によって求められる、温度２３±１℃、相対湿度５５±１％でのタイプＡデュロメータ硬さで表してＡ６０／Ｓ以上、特にＡ７０／Ｓ以上であるのが好ましく、Ａ９５／Ｓ以下、特にＡ９０／Ｓ以下であるのが好ましい。
The thickness of the paper sheet multi-feed preventing member 4 is preferably about the same as that of the conventional one in consideration of incorporation into the paper feeding mechanism 1. Although the thickness varies depending on the structure of the sheet feeding mechanism 1 and the structure of the image forming apparatus incorporating the sheet feeding mechanism 1, the thickness is preferably 0.2 mm or more, particularly 0.4 mm or more, and 4 mm or less, particularly 3. It is preferably 5 mm or less.
Further, the hardness of the paper sheet multi-feed preventing member 4 is determined by a measuring method defined in Japanese Industrial Standard JIS K6253: 2006 “Vulcanized Rubber and Thermoplastic Rubber—How to Obtain Hardness”, and the temperature is 23 ± 1. It is preferably A60 / S or more, particularly preferably A70 / S or more, more preferably A95 / S or less, and particularly preferably A90 / S or less in terms of type A durometer hardness at 55 ° C. and relative humidity 55 ± 1%.
紙葉類重送防止部材４の硬さが前記範囲未満では、前記紙葉類重送防止部材４の接触面５が軟らかすぎて、紙葉類との摩擦によって磨耗しやすくなるおそれがある。また硬さが前記範囲を超える場合には紙葉類重送防止部材４が硬くなって、接触面５を給紙ローラ３の外周面２に接触させた際の厚み方向の変形量が小さくなる傾向がある。そのため、前記接触面５の摩擦力によって紙葉類の重送を防止する効果が低下して、摩擦係数の異なる様々な種類の紙葉類に十分に対応して重送を確実に防止できなくなるおそれがある。 If the hardness of the paper sheet multi-feed preventing member 4 is less than the above range, the contact surface 5 of the paper sheet multi-feed preventing member 4 is too soft and may be easily worn by friction with the paper sheet. When the hardness exceeds the above range, the paper sheet multi-feed preventing member 4 becomes hard and the amount of deformation in the thickness direction when the contact surface 5 is brought into contact with the outer peripheral surface 2 of the paper feed roller 3 is reduced. Tend. For this reason, the effect of preventing the multi-feed of the paper sheets is reduced by the frictional force of the contact surface 5, and it becomes impossible to reliably prevent the multi-feed by sufficiently corresponding to various types of paper sheets having different friction coefficients. There is a fear.
紙葉類重送防止部材４の硬さを調整するためには、例えばエラストマの種類やグレードを選択したり、フィラーの種類や量を調整したりすればよい。
紙葉類重送防止部材４は、例えば両面粘着テープ、両面接着テープ等を用いて支持台６に固定することにより、給紙機構１に組み込むことができる。
In order to adjust the hardness of the paper sheet multi-feed preventing member 4, for example, the type and grade of the elastomer may be selected, or the type and amount of the filler may be adjusted.
The paper sheet multi-feed preventing member 4 can be incorporated into the paper feeding mechanism 1 by being fixed to the support base 6 using, for example, a double-sided adhesive tape, a double-sided adhesive tape, or the like.
以下の実施例、比較例における紙葉類重送防止部材の製造、特性の測定、および試験を、特記した以外は温度２３±１℃、相対湿度５５±１％の環境下で実施した。
〈実施例１〉
熱可塑性ポリエステル系エラストマ〔東レ・デュポン(株)製のハイトレル（登録商標）３０４６〕７０質量部、熱可塑性ポリウレタン系エラストマ〔ＢＡＳＦ社製のエラストラン（登録商標）ＥＴ８８０〕３０質量部、およびカーボンブラック〔東海カーボン(株)製の商品名シーストＳＯ〕１質量部を配合し、２軸押出機を用いて混練し、次いで単軸押出機を用いて厚み１．３５ｍｍのシート状に押出成形したのち矩形状に切り出すとともに表面を研磨して、厚み１．０ｍｍの矩形平板状の紙葉類重送防止部材を製造した。
Production of the paper sheet multi-feed preventing member, measurement of characteristics, and tests in the following examples and comparative examples were performed in an environment of a temperature of 23 ± 1 ° C. and a relative humidity of 55 ± 1%, unless otherwise specified.
<Example 1>
70 parts by mass of thermoplastic polyester elastomer (Hytrel (registered trademark) 3046 manufactured by Toray DuPont), 30 parts by mass of thermoplastic polyurethane elastomer (Elastollan (registered trademark) ET880 manufactured by BASF), and carbon black After blending 1 part by weight of [Tokai Carbon Co., Ltd., trade name Seast SO], kneading using a twin screw extruder, and then extruding into a 1.35 mm thick sheet using a single screw extruder The sheet was cut into a rectangular shape and the surface was polished to produce a rectangular flat sheet-shaped paper sheet multi-feed preventing member having a thickness of 1.0 mm.
前記実施例１の紙葉類重送防止部材におけるエラストマ成分のモルフォロジーを、走査型プローブ顕微鏡〔セイコーインスツル(株)製のＳＴＩ３８００Ｎ〕を用いて観察したところ、図３に示すように、熱可塑性ポリエステル系エラストマ（図中の色の薄い領域）中に熱可塑性ポリウレタン系エラストマの粒子（図中の色の濃い部分）が微分散した海−島構造を呈していることが確認された。また前記図３から、画像解析によって熱可塑性ポリウレタン系エラストマの粒子の粒径を求めたところ０．５μｍであった。 The morphology of the elastomer component in the first embodiment of the paper sheet multi-feed prevention member, was observed with a scanning probe microscope [STI3800N of Seiko Instruments Inc.], as shown in FIG. 3, the thermoplastic It was confirmed that a thermoplastic polyurethane elastomer particle (dark colored portion in the figure) had a finely dispersed sea-island structure in the polyester elastomer (light colored region in the figure). From FIG. 3, the particle size of the thermoplastic polyurethane elastomer particles was determined by image analysis and found to be 0.5 μm.
〈実施例２〉
熱可塑性ポリエステル系エラストマを３０質量部、熱可塑性ポリウレタン系エラストマを７０質量部としたこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
前記実施例２の紙葉類重送防止部材におけるエラストマ成分のモルフォロジーを、前記走査型プローブ顕微鏡を用いて観察したところ、図４に示すように、熱可塑性ポリウレタン系エラストマ（図中の色の濃い領域）中に熱可塑性ポリエステル系エラストマの粒子（図中の色の薄い部分）が微分散した海−島構造を呈していることが確認された。また前記図４から、画像解析によって熱可塑性ポリエステル系エラストマの粒子の粒径を求めたところ０．８μｍであった。
<Example 2>
In the same manner as in Example 1 except that the thermoplastic polyester elastomer was 30 parts by mass and the thermoplastic polyurethane elastomer was 70 parts by mass, a paper sheet multi-feed preventing member having the same shape and the same dimensions was produced.
When the morphology of the elastomer component in the paper sheet multi-feed preventing member of Example 2 was observed using the scanning probe microscope, as shown in FIG. 4, a thermoplastic polyurethane elastomer (the dark color in the figure) was observed. It was confirmed that thermoplastic polyester elastomer particles (light-colored portions in the figure) had a finely dispersed sea-island structure in (region). Further, from FIG. 4, the particle size of the thermoplastic polyester elastomer particles was determined by image analysis and found to be 0.8 μm.
なお前記図３と図４とを比較すると図３の方が海−島構造がはっきりしており、この構造の差が、後述する実施例１、２における性能のバランス、特に音鳴き防止効果の差になって現れていると考えられた。
〈実施例３〉
熱可塑性ポリエステル系エラストマを９３質量部、熱可塑性ポリウレタン系エラストマを７質量部としたこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
3 and 4, the sea-island structure is clearer in FIG. 3, and the difference in this structure is the balance of performance in Examples 1 and 2 to be described later, in particular, the noise prevention effect. It was thought that it appeared as a difference.
<Example 3>
A paper sheet multi-feed preventing member having the same shape and the same dimensions was produced in the same manner as in Example 1 except that 93 parts by mass of the thermoplastic polyester elastomer and 7 parts by mass of the thermoplastic polyurethane elastomer were used.
〈実施例４〉
熱可塑性ポリエステル系エラストマを１５質量部、熱可塑性ポリウレタン系エラストマを８５質量部としたこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
〈比較例１〉
熱可塑性ポリウレタン系エラストマを１００質量部として熱可塑性ポリエステル系エラストマを配合しなかったこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
<Example 4>
A paper sheet multi-feed preventing member having the same shape and the same dimensions was produced in the same manner as in Example 1 except that 15 parts by mass of the thermoplastic polyester elastomer and 85 parts by mass of the thermoplastic polyurethane elastomer were used.
<Comparative example 1>
A paper sheet multi-feed preventing member having the same shape and the same dimensions was produced in the same manner as in Example 1 except that 100 parts by mass of the thermoplastic polyurethane elastomer was not blended with the thermoplastic polyester elastomer.
〈比較例２〉
熱可塑性ポリエステル系エラストマを１００質量部として熱可塑性ポリウレタン系エラストマを配合しなかったこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
〈比較例３〉
熱可塑性ポリエステル系エラストマを９７質量部、熱可塑性ポリウレタン系エラストマを３質量部としたこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
<Comparative example 2>
A paper sheet multi-feed preventing member having the same shape and the same dimensions was produced in the same manner as in Example 1 except that the thermoplastic polyurethane elastomer was not blended with 100 parts by mass of the thermoplastic polyester elastomer.
<Comparative Example 3>
A paper sheet multi-feed prevention member having the same shape and the same dimensions was produced in the same manner as in Example 1 except that 97 parts by mass of the thermoplastic polyester elastomer and 3 parts by mass of the thermoplastic polyurethane elastomer were used.
〈比較例４〉
熱可塑性ポリエステル系エラストマを７質量部、熱可塑性ポリウレタン系エラストマを９３質量部としたこと以外は実施例１と同様にして、同形状でかつ同寸法の紙葉類重送防止部材を製造した。
〈比較例５〉
ＥＰＤＭ〔住友化学(株)製のエスプレン（登録商標）Ｅ５０５〕７０質量部、ポリプロピレン〔日本ポリプロ(株)製のノバテック（登録商標）ＭＧ０５ＥＳ〕３０質量部、カーボンブラック〔前出のシーストＳＯ〕１質量部、および樹脂架橋剤〔田岡化学工業(株)製のタッキロール（登録商標）２５０−III〕５．６質量部を配合し、混練してＥＰＤＭを動的架橋させて、前記ポリプロピレン中にＥＰＤＭの架橋物が分散されたエラストマ組成物を調製した。
<Comparative example 4>
A sheet multi-feed preventing member having the same shape and the same dimensions was produced in the same manner as in Example 1 except that 7 parts by mass of the thermoplastic polyester elastomer and 93 parts by mass of the thermoplastic polyurethane elastomer were used.
<Comparative Example 5>
70 parts by mass of EPDM [Esprene (registered trademark) E505 manufactured by Sumitomo Chemical Co., Ltd.], 30 parts by mass of polypropylene [Novatech (registered trademark) MG05ES manufactured by Nippon Polypro Co., Ltd.], carbon black [Seat SO described above] 1 And 5.6 parts by mass of a resin cross-linking agent [Tacco Roll (registered trademark) 250-III manufactured by Taoka Chemical Co., Ltd.] are mixed and kneaded to dynamically cross-link the EPDM. An elastomer composition in which the crosslinked product was dispersed was prepared.
次いで前記エラストマ組成物を、単軸押出機を用いて厚み１．３５ｍｍのシート状に押出成形したのち矩形状に切り出すとともに表面を研磨して、厚み１．０ｍｍの矩形平板状の紙葉類重送防止部材を製造した。
〈硬さ測定〉
前記実施例、比較例で製造した紙葉類重送防止部材のタイプＡデュロメータ硬さを、前出のＪＩＳ Ｋ６２５３：２００６に規定された測定方法に則って測定した。
Next, the elastomer composition was extruded into a sheet having a thickness of 1.35 mm using a single-screw extruder, cut into a rectangular shape, and the surface was polished to obtain a sheet weight of a rectangular flat plate having a thickness of 1.0 mm. A feed prevention member was manufactured.
<Hardness measurement>
The type A durometer hardness of the paper sheet multi-feed preventing member produced in the examples and comparative examples was measured in accordance with the measurement method defined in the above-mentioned JIS K6253: 2006.
〈摩擦係数の測定〉
前記実施例、比較例で製造した紙葉類重送防止部材の表面の、測定紙としての普通紙〔キヤノン(株)製のプロパーボンド紙（ＰＢ ＰＡＰＥＲ）〕に対する摩擦係数を、表面性状測定機〔新東科学(株)製のトライボギア（登録商標） タイプ ＨＥＩＤＯＮ（ヘイドン（登録商標）−１４ＤＲ〕を用いて測定した。測定の条件は、紙葉類重送防止部材の面方向のサイズ：１０ｍｍ×３０ｍｍ、荷重：１．９６Ｎ（２００ｇｆ）、速度：６００ｍｍ／分とした。
<Measurement of friction coefficient>
A surface texture measuring machine was used to measure the coefficient of friction of the surface of the paper sheet multi-feed preventing member manufactured in the above-mentioned Examples and Comparative Examples with respect to plain paper (PB PAPER manufactured by Canon Inc.) as a measuring paper. [Measured using Tribogear (registered trademark) type HEIDON (Haydon (registered trademark) -14DR) manufactured by Shinto Kagaku Co., Ltd.] The measurement condition was the size in the surface direction of the paper sheet multi-feed preventing member: 10 mm × 30 mm, load: 1.96 N (200 gf), speed: 600 mm / min.
〈耐摩耗性試験〉
前記実施例、比較例で製造した紙葉類重送防止部材の初期質量を測定後、前記紙葉類重送防止部材をモノクロレーザープリンタ〔キヤノン(株)製のＬＢＰ−１４２０〕の純正の分離パッドに代えて装着した。
そしてＰＰＣ用紙を３０００枚連続して通紙させた後の質量を測定し、前記初期質量との差を摩耗量（ｍｇ）として求めて耐摩耗性を評価した。
<Abrasion resistance test>
After measuring the initial mass of the paper sheet multi-feed preventing member manufactured in the above-mentioned Examples and Comparative Examples, the paper sheet multi-feed preventing member is used as a genuine separation of a monochrome laser printer [LBP-1420 manufactured by Canon Inc.]. It was replaced with a pad.
Then, the mass after continuously passing 3000 PPC papers was measured, and the difference from the initial mass was determined as the wear amount (mg) to evaluate the wear resistance.
〈音鳴き評価〉
前記耐摩耗性試験においてＰＰＣ用紙を連続して通紙させている間に音鳴きが発生したか否かを、下記の基準で評価した。
◎：音鳴きは全く発生しなかった。
○：音鳴きがわずかに発生したが、許容レベルであると判断した。
<Sound evaluation>
In the abrasion resistance test, whether or not a squeal occurred while continuously passing PPC paper was evaluated according to the following criteria.
A: No sound was generated.
○: A slight squeal occurred, but it was judged to be an acceptable level.
△：音鳴きが頻繁ではないが時折発生し、改善が必要と判断した。
×：音鳴きが頻繁に発生した。
〈重送の有無〉
前記耐摩耗性試験においてＰＰＣ用紙を連続して通紙させている間に、２枚以上のＰＰＣ用紙の重送が発生したか否かを下記の基準で評価した。
Δ: Sound was not frequent but occasionally occurred, and it was judged that improvement was necessary.
X: Sound was frequently generated.
<With / without double feed>
In the abrasion resistance test, whether or not multiple feeds of two or more PPC sheets occurred while the PPC sheets were continuously passed was evaluated according to the following criteria.
○：重送は全く発生しなかった。
△：１回以上、数回程度の重送が発生した。
×：重送が頻繁に発生した。
以上の結果を表１に示す。
○: No double feed occurred.
Δ: Overfeed occurred several times.
×: Frequent feeding occurred frequently.
The results are shown in Table 1.
表より、従来の、ポリプロピレン中にＥＰＤＭの架橋物を分散させたエラストマ組成物からなる比較例５の重送防止部材は、摩擦係数が小さく重送を生じやすい上、摩耗量が大きく耐摩擦性が不十分であり、しかも音鳴きを生じやすいことが判った。
またエラストマ成分として熱可塑性ポリウレタン系エラストマのみを用いて形成した比較例１の紙葉類重送防止部材、および熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用したものの、前記熱可塑性ポリウレタン系エラストマの割合を９３質量％とした比較例４の紙葉類重送防止部材は、いずれも前記比較例５のものよりも摩擦係数が大きく重送防止効果に優れるとともに、摩耗量が小さく耐摩耗性にも優れているものの、依然として音鳴きを生じることが判った。
From the table, the conventional multifeed prevention member of Comparative Example 5 made of an elastomer composition in which a crosslinked product of EPDM is dispersed in polypropylene has a small friction coefficient and easily causes multifeed, and has a large wear amount and friction resistance. Has been found to be inadequate and likely to produce noise.
Also although a combination of the thermoplastic polyurethane elastomers only the paper sheet multi-feed preventing member of Comparative Example 1 was formed by using and thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer, as the elastomer component, the thermoplastic polyurethane The paper sheet multi-feed preventing member of Comparative Example 4 having an elastomer ratio of 93% by mass has a higher coefficient of friction than the one of Comparative Example 5 and has an excellent multi-feed preventing effect, and has a small wear amount and wear resistance. Although it is excellent in performance, it has been found that it still produces noise.
またエラストマ成分として熱可塑性ポリエステル系エラストマのみを用いて形成した比較例２の紙葉類重送防止部材、および熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用したものの、前記熱可塑性ポリウレタン系エラストマの割合を３質量％とした比較例３の紙葉類重送防止部材は、いずれも音鳴きを全く生じないものの、前記比較例１、４と比べて摩擦係数がごくわずか小さい分だけ重送を生じやすく、また摩耗量が大きく耐摩耗性が不十分であることが判った。 Also although a combination of a thermoplastic polyester elastomer alone of Comparative Example 2 which is formed using a paper sheet multi-feed prevention member and a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer, as the elastomer component, the thermoplastic polyurethane Although the paper sheet multi-feed preventing member of Comparative Example 3 in which the ratio of the elastomer is 3% by mass does not produce any squealing at all, it is heavier than the Comparative Examples 1 and 4 because the friction coefficient is extremely small. It was found that feeding was easy to occur and the wear amount was large and the wear resistance was insufficient.
これに対し、熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用するとともに、前記熱可塑性ポリウレタン系エラストマの、エラストマ成分の総量に占める割合を５質量％以上、９０質量％以下とした実施例１〜４の紙葉類重送防止部材は、いずれも摩擦係数が大きく重送防止効果に優れているとともに、摩耗量が小さく耐摩耗性にも優れており、その上、音鳴きが許容範囲内であることが判った。 In contrast, an example in which a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer are used in combination, and the ratio of the thermoplastic polyurethane elastomer to the total amount of the elastomer component is 5% by mass or more and 90% by mass or less. The paper sheets double feed prevention members 1 to 4 all have a large friction coefficient and excellent double feed prevention effect, and also have a small amount of wear and excellent wear resistance. It turned out to be within.
特に、エラストマ成分として熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用するとともに、前記熱可塑性ポリウレタン系エラストマの割合を３０質量％、熱可塑性ポリエステル系エラストマの割合を７０質量％（熱可塑性ポリエステル系エラストマリッチ）として、先に説明したようにそのモルフォロジーを、熱可塑性ポリエステル系エラストマ中に熱可塑性ポリウレタン系エラストマの粒子が微分散した図３の海−島構造とした実施例１の紙葉類重送防止部材は、摩擦係数が大きく重送防止効果に優れているとともに、摩耗量が小さく耐摩耗性にも優れており、その上、音鳴きを全く生じないことが判った。 In particular, a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer are used in combination as an elastomer component, the proportion of the thermoplastic polyurethane elastomer is 30% by mass, and the proportion of the thermoplastic polyester elastomer is 70% by mass ( thermoplastic polyester). As described above, the morphology is the sea-island structure of FIG. 3 in which thermoplastic polyurethane elastomer particles are finely dispersed in a thermoplastic polyester elastomer, as described above. It has been found that the multifeed prevention member has a large friction coefficient and an excellent multifeed prevention effect, has a small amount of wear and is excellent in wear resistance, and does not generate any noise.
またエラストマ成分として熱可塑性ポリウレタン系エラストマと熱可塑性ポリエステル系エラストマとを併用するとともに、前記熱可塑性ポリウレタン系エラストマの割合を７０質量％、熱可塑性ポリエステル系エラストマの割合を３０質量％（ポリウレタン系エラストマリッチ）として、先に説明したようにそのモルフォロジーを、熱可塑性ポリウレタン系エラストマ中に熱可塑性ポリエステル系エラストマの粒子が微分散した図４の海−島構造とした実施例２の紙葉類重送防止部材は、音鳴きがわずかに発生したものの許容レベルであり、また摩擦係数が大きく重送防止効果に優れている上、摩耗量が大幅に小さく耐摩耗性に特にすぐれていることが判った。 In addition, a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer are used in combination as an elastomer component, the ratio of the thermoplastic polyurethane elastomer is 70% by mass, and the ratio of the thermoplastic polyester elastomer is 30% by mass (polyurethane elastomer rich). As described above, the morphology is the sea-island structure of FIG. 4 in which the particles of thermoplastic polyester elastomer are finely dispersed in the thermoplastic polyurethane elastomer. It was found that the member was at an acceptable level with a slight squeal, having a large coefficient of friction and excellent anti-multifeed effect, and having a much smaller wear amount and particularly excellent wear resistance.
１ 給紙機構
２ 外周面
３ 給紙ローラ
４ 紙葉類重送防止部材
５ 接触面
６ 支持台
７ 紙葉類
DESCRIPTION OF SYMBOLS 1 Paper feed mechanism 2 Outer peripheral surface 3 Paper feed roller 4 Paper sheet double feed prevention member 5 Contact surface 6 Support stand 7 Paper sheet
Claims (2)
(1) 前記熱可塑性ポリウレタン系エラストマ中に熱可塑性ポリエステル系エラストマの粒子が微分散した海−島構造、または
(2) 前記熱可塑性ポリエステル系エラストマ中に熱可塑性ポリウレタン系エラストマの粒子が微分散した海−島構造
を呈することを特徴とする紙葉類重送防止部材。 A paper sheet multi-feed preventing member having a contact surface in contact with a paper sheet, wherein at least the contact surface contains a thermoplastic polyurethane elastomer and a thermoplastic polyester elastomer as an elastomer component, and the heat The proportion of the plastic polyurethane elastomer in the total amount of the elastomer component is 5% by mass or more and 90% by mass or less, and the elastomer component is
(1) A sea-island structure in which thermoplastic polyester elastomer particles are finely dispersed in the thermoplastic polyurethane elastomer, or
(2) A sea-island structure in which thermoplastic polyurethane elastomer particles are finely dispersed in the thermoplastic polyester elastomer.
A paper sheet multi-feed preventing member characterized by exhibiting
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| JP2009240634A JP5260466B2 (en) | 2009-10-19 | 2009-10-19 | Paper sheet double feed prevention member |
| CN201010294465.4A CN102040108B (en) | 2009-10-19 | 2010-09-20 | Prevent multipage paper feed parts |
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| KR100526284B1 (en) * | 2000-08-14 | 2005-11-08 | 가부시키가이샤 구라레 | Polymer composition |
| JP2005206303A (en) * | 2004-01-21 | 2005-08-04 | Sumitomo Rubber Ind Ltd | Double-feed prevention member for paper sheet |
| JP3977819B2 (en) * | 2004-03-26 | 2007-09-19 | 住友ゴム工業株式会社 | Paper sheet double feed prevention member |
| EP1920919B1 (en) * | 2005-08-31 | 2012-11-28 | Tetra Laval Holdings & Finance S.A. | Packaging layered material |
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| JP2011084394A (en) | 2011-04-28 |
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