JP2004277179A - Paper sheet carrying and accumulating member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paper sheet carrying and accumulating member capable of reducing a friction coefficient on a surface while maintaining durability. <P>SOLUTION: The member has a cylindrical part 1 in a cylindrical shape and a plurality of blade parts 2 provided in the periphery of the cylindrical part 1 and radially extended respectively. The blade part 2 is made of ester polyurethane, and has a surface treatment layer 2a on its surface, which is formed by being impregnated with a surface treatment solution comprising at least an isocyanate component. The friction coefficient of the blade surface to a PPC paper is 0.3-1.0. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sheet transporting / stacking member used for transporting and accumulating paper sheets such as bills, magnetic cards, tickets, and the like in automatic ticket gates, cash deposit dispensers, currency exchange machines, automatic ticketing machines, and the like.

  2. Description of the Related Art Conventionally, in automatic ticket gates, cash deposit dispensers, currency exchange machines, automatic ticketing machines, etc., in the process of transporting bills, magnetic cards, tickets, etc. An impeller-shaped rubber member (hereinafter, referred to as a sheet transporting / accumulating member) is used. This paper sheet transport / stacking member has a structure having a plurality of thin plate-shaped blade portions radially on the outer periphery of a cylindrical portion (see Patent Document 1 and the like).

  The above-described paper sheet transport / accumulating member transports and accumulates the paper sheets by hitting the blades to the paper sheets while being rotated at a high speed, so that the wear resistance of the blades is required. Conventionally, generally, a resin film made of a resin such as polyimide has been used.

  However, since the blades are slammed at high speed against paper sheets, there is a problem that the base end of the blades is apt to be torn off. (See Patent Document 3), and those using a predetermined core material (see Patent Document 3).

  However, when a rubber member such as polyurethane is used, there is a problem that the friction with the paper sheet on the surface is too large and the paper sheet is caught when knocking down the paper sheet.

  On the other hand, as a method of reducing the friction coefficient, generally, there is a method of applying a fluorine-based or silicone-based coating, a method of chlorination treatment, and the like, but there is a problem that the coating layer is peeled off in the coating, In the chlorination treatment, there is a problem that the friction coefficient does not sufficiently decrease, or even if the friction coefficient decreases, the friction coefficient increases due to wear due to continuous use.

WO95 / 23753 (Fig. 1 etc.) JP-A-10-072517 (Claims, etc.) JP 2003-012209 (Claims, etc.)

  In view of such circumstances, an object of the present invention is to provide a sheet transporting / stacking member that maintains durability and has a reduced surface friction coefficient.

  A first aspect of the present invention for solving the above-mentioned problem is a paper sheet transport / stacking member having a cylindrical cylindrical portion and a plurality of blade portions provided on an outer peripheral surface of the cylindrical portion and extending radially. The blade section is made of an ester-based polyurethane, and has a surface treatment layer formed by impregnating a surface treatment liquid containing at least an isocyanate component on the surface thereof, and a PPC paper on the surface of the blade section. A coefficient of friction with respect to 0.3 to 1.0.

  According to a second aspect of the present invention, in the sheet transporting / accumulating member according to the first aspect, the surface treatment layer permeates at least 30 μm in a thickness direction from a surface of the blade. is there.

  According to a third aspect of the present invention, in the first or second aspect, the surface treatment liquid further contains at least one polymer selected from a fluorine-based polymer and a silicone-based polymer. Paper transporting and stacking member.

  According to a fourth aspect of the present invention, there is provided the sheet transport / accumulating member according to the third aspect, wherein the surface treatment liquid further comprises carbon black dispersed therein.

  According to a fifth aspect of the present invention, in the sheet transporting / accumulating member according to the fourth aspect, the carbon black in the surface treatment liquid is 10 to 40% by weight based on the isocyanate component. is there.

  According to a sixth aspect of the present invention, in any one of the third to fifth aspects, the polymer in the surface treatment liquid is 2 to 30% by weight based on the isocyanate component. In the stacking member.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the isocyanate component in the surface treatment liquid is not more than 25% by weight based on the solvent in the surface treatment liquid. The present invention is a member for transporting and accumulating paper sheets.

  An eighth aspect of the present invention is the member for conveying and accumulating paper sheets according to any one of the first to seventh aspects, wherein the rubber hardness of the blade is 50 ° to 90 ° in JIS A. It is in.

  Since the sheet transporting / accumulating member of the present invention has its blades subjected to a surface treatment with a surface treatment liquid mainly containing an isocyanate component, a surface treatment layer penetrating from the surface to the inside is formed, and friction is generated. The coefficient is reduced to 0.3 to 1.0 and the durability is excellent.

  It is preferable to use polyurethane as the rubber material as the material of such a blade portion in order to suitably perform other mechanical properties such as abrasion resistance and treatment with a surface treatment liquid.

  The polyurethane may be a commonly used cast type polyurethane or a kneaded type polyurethane, and particularly preferably a kneaded type poly-ε-caprolactone-based polyurethane.

  Among such poly-ε-caprolactone-based polyurethanes, the average value of the caprolactone chain in the poly-ε-caprolactone-based diol obtained from the reaction between a polyol containing poly-ε-caprolactone-based diol and polyisocyanate is within a predetermined range. Kneaded polyurethane having a molecular weight distribution Mw / Mn of the caprolactone chain portion of the poly-ε-caprolactone diol of 1.5 or less, the crystallinity of the caprolactone chain being restricted, and having rubber-like elasticity. Is preferred. By using such a specific kneaded polyurethane, wear on the surface of the blade is almost eliminated, and tearing at the base end of the blade is also prevented. A sheet transporting / stacking member that can be stably performed over the entirety can be provided.

  In addition, it is preferable that the rubber hardness of the blade portion is 50 ° to 90 ° according to JIS A. This is because it is necessary to provide desired durability.

  The sheet transporting / accumulating member of the present invention may be a member in which a cylindrical portion and a blade portion are integrally formed, or a member in which both are separately formed and a blade portion is attached to the cylindrical portion.

  The shape of the blade is not particularly limited, and may be a thin plate, a rod, or the like, and the cross-sectional shape may be a rectangle, a circle, an ellipse, or a combination thereof. For example, the shape may be uneven. Further, in order to make the blade portion more difficult to tear, the periphery of the blade portion may be formed in an R shape, and further, the base end portion of the blade portion is made thicker as approaching the cylindrical portion, and the blade base portion and the cylindrical portion are formed. May have an R-shaped boundary.

  The surface treatment layer formed on at least the surface of the blade portion of the sheet transporting / accumulating member of the present invention is at least partially impregnated in the blade main body made of polyurethane and provided integrally with the blade main body. Things. That is, such a surface treatment layer is formed by a surface treatment solution obtained by adding a fluorine-based polymer or a silicone-based polymer, or carbon black to an isocyanate component as necessary. Since the surface treatment layer is formed by impregnation coating, the surface treatment layer is integrally formed so as to be gradually sparse from the surface toward the inside. Therefore, unlike a general coating layer, there is no problem such as peeling. That is, it is presumed that the isocyanate reacts with the urethane bond to form allohanate, uretdione, nurate, and the like, and is strongly bonded. Further, since the isocyanate component in the surface treatment liquid reacts with the isocyanate of the rubber elastic layer and is strongly integrated, problems such as peeling are further avoided.

  In addition, since the surface treatment layer of the present invention is formed from a surface treatment solution obtained by adding a fluorine-based polymer or a silicone-based polymer to an isocyanate component, it is elastically deformed as compared with a coating layer formed from a fluororesin or a silicone resin. There is also an advantage that the rubber elastic body is not easily cracked.

  Such a surface treatment layer of the present invention is impregnated with 30 μm or more, preferably 0.1 mm or more from the surface of the blade portion, and thus has a low friction coefficient at the initial stage, but 30 μm or more, and more preferably 0.1 mm or more. It has the characteristic of maintaining a low coefficient of friction even after being worn, and the coefficient of friction of the initial state and the surface after 30 μm abrasion on PPC paper is 1.0 or less, respectively.

  Further, the surface treatment liquid of the present invention is relatively prepared by adjusting components such as when only an isocyanate component is used, when a fluorine-based polymer or a silicone-based polymer is added thereto, and when carbon black is added. The friction coefficient can be easily changed. For example, when treated with only an isocyanate component, the friction coefficient against PPC paper becomes about 0.5 to 0.7, but when a fluorine-based polymer or silicone-based polymer is added thereto, the friction coefficient decreases to 0.5 or less. Therefore, it can be appropriately selected according to the application.

  Here, the coefficient of friction with respect to PPC paper in the present invention refers to a coefficient measured by the method of the following test example.

  The surface treatment liquid used in the present invention is obtained by adding a fluorine-based polymer or a silicone-based polymer to an isocyanate component and dissolving them in a solvent.

  Here, as the isocyanate component, 2,6-tolylene diisocyanate (TDI), 4,4′-diphenylmethane diisocyanate (MDI), paraphenylene diisocyanate (PPDI), 1,5-naphthalene diisocyanate (NDI), and 3,3 Isocyanate compounds such as -dimethyldiphenyl-4,4'-diisocyanate (TODI). In addition, dimers or trimers of these isocyanate compounds, and those obtained by prepolymerizing the isocyanate compound alone or together with a polyol can also be used.

  The fluorine-based polymer and the silicone-based polymer are soluble in a predetermined solvent and are capable of reacting with an isocyanate compound to be chemically bonded. In particular, it is preferable to use an acrylic fluorine-based polymer or an acrylic silicone-based polymer. .

  Here, the acrylic fluorine-based polymer is, for example, a solvent-soluble fluorine-based polymer having a hydroxyl group, an alkyl group, or a carboxyl group, and includes, for example, a block copolymer of an acrylate ester and a fluoroalkyl acrylate or a derivative thereof. be able to. The acrylic silicone polymer is a solvent-soluble silicone polymer, and examples thereof include a block copolymer of an acrylate ester and a siloxane acrylate ester and derivatives thereof. In the present invention, these polymers are used alone or in combination of two or more.

  Solvents that can be used in the present invention include ethyl acetate, methyl ethyl ketone (MEK), toluene, acetone, cyclohexanone, and the like, as well as reactive diluents such as 2-hydroxyethyl acrylate, tetrahydrofurfuryl acrylate, 2-hydroxy Any material may be used as long as it can dissolve the polymer component used such as ethyl methacrylate, hydroxypropyl methacrylate, glycidyl methacrylate, neopentyl glycol diacrylate, hexanediol diacrylate, and trimethylolpropane triacrylate, and is compatible with the isocyanate component.

  The surface treatment layer of the present invention can further reduce the friction coefficient by containing carbon black. Such a carbon black can be fixed in the surface treatment layer by forming the surface treatment layer in a state of being dispersed in the surface treatment liquid.

  Here, for the purpose of lowering the coefficient of friction, carbon black having no conductivity may be used as the carbon black. On the contrary, the surface treatment layer can be formed by adding conductive carbon black. Can impart conductivity. The conductive carbon black includes, for example, Ketjen Black (manufactured by Lion), Toka Black # 5500 (manufactured by Tokai Carbon), and the like.

  The amount of carbon black in the surface treatment liquid is preferably 40% by weight or less based on the isocyanate component. If the amount is too large, problems such as falling off occur, which is not preferable. In order to provide conductivity, it is preferable to add 10% by weight or more.

  The content of the polymer in the surface treatment liquid is preferably 2 to 30% by weight based on the isocyanate component. If the amount is less than this, the effect of retaining the carbon black in the surface treatment layer is reduced. If the amount is too large, the isocyanate component is relatively reduced and an effective surface treatment layer cannot be formed.

  Furthermore, the surface treatment liquid used in the present invention preferably has an isocyanate component content of 25% by weight based on the solvent in the surface treatment liquid. This is because, if the isocyanate component is contained in an amount of more than 25% by weight based on the solvent, the viscosity of the surface treatment liquid is increased, or liquid pools are easily formed on the treated surface, and uniform treatment becomes difficult. As a result, a resinized treatment layer is formed on the treatment surface, and the blades are easily cut.

  The method for forming the surface treatment layer with the surface treatment liquid is not particularly limited, and the surface treatment layer may be formed at least on the blade at least on the contact side with the paper sheet.

  The method of impregnation and application of the surface treatment liquid can be performed by various methods such as application with a brush or the like, spraying, dipping, and the like.

  It goes without saying that the surface treatment may be performed on the entire surface or only on the blade portion.

  As described above, since the paper sheet transport / accumulating member of the present invention has a surface treatment layer formed of a surface treatment liquid containing isocyanate as a main component on the surface of the blade portion made of polyurethane, the friction coefficient is small, and It is suitable for knocking down and transporting and collecting leaves.

  Hereinafter, the present invention will be described in more detail. Hereinafter, specific examples will be described, but it goes without saying that the present invention is not limited to these examples.

[Example 1]
First, 62 parts by weight of ethylene glycol and 1140 parts by weight of ε-caprolactone are appropriately reacted in the presence of 30 ppm of a catalyst (SnCl ₂ ) to obtain a poly-ε-caprolactone system having a caprolactone chain of 5 and a molecular weight Mn of 1200. The diol was obtained. To 100 parts by weight of this poly-ε-caprolactone diol, 20 parts by weight of MDI (4,4′-diphenylmethane diisocyanate) was added and reacted at 100 ° C. for 6 hours to obtain a millable urethane.

  Subsequently, 100 parts by weight of this millable urethane, 7 parts by weight of a peroxide crosslinking agent Parkmill D-40 (trade name, manufactured by NOF Corporation), 10 parts by weight of carbon black, 2 parts by weight of an antioxidant, and process oil 30 parts by weight were mixed and kneaded with an open roll.

  Next, the kneaded polyurethane was subjected to electrothermal press vulcanization molding to obtain a sheet transporting / stacking member (hardness Hs73).

  As shown in FIG. 1, the paper sheet transport / stacking member is formed by integrally forming a blade portion 2 radially around a cylindrical portion 1. Here, the cylindrical portion 1 has an inner diameter of about 5 to 12 mm, an outer shape of about 7 to 15 mm, a length of the blade section 2 of about 10 to 50 mm, and a width (rotational axis direction dimension) of about 3 to 6 mm. The thickness is about 0.7 to 1 mm.

(Preparation of surface treatment liquid)
80 parts by weight of ethyl acetate, 20 parts by weight of an isocyanate compound (MD1: manufactured by Dainippon Ink), 4 parts by weight of acetylene black (manufactured by Denki Kagaku), and 2 parts by weight of an acrylic fluoropolymer (Modiper F600: manufactured by NOF Corporation) After stirring for a minute, a surface treatment liquid was obtained.

(surface treatment)
After washing the blade portion of the sheet transporting / stacking member with ethyl acetate, the surface treatment liquid prepared as described above was applied and impregnated on the blade portion with a brush, and then heat-treated at 120 ° C. for 60 minutes.

[Example 2]
A member for conveying and stacking paper sheets in the same manner as in Example 1 except that a surface treatment solution obtained by stirring 80 parts by weight of ethyl acetate and 20 parts by weight of an isocyanate compound (MD1: manufactured by Dainippon Ink and Chemicals, Inc.) for 3 minutes was used. Was manufactured.

[Comparative Example 1]
A sheet transporting / accumulating member was manufactured in the same manner as in Example 1 except that the surface treatment was not performed.

[Comparative Example 2]
A sheet transporting / stacking member was prepared in the same manner as in Example 1 except that a nitrile rubber was used.

(Adjustment of surface treatment liquid)
A solution of hydrochloric acid and bleached powder was prepared.

(surface treatment)
The blades were immersed in a treatment solution of hydrochloric acid-exposed powder for 60 minutes, and then dried at 50 ° C. for 15 minutes.

(Test Example 1)
The blades of Examples 1 and 2 and Comparative Examples 1 and 2 were cut out, and the friction coefficient was measured using the apparatus of FIG.

  A Teflon (registered trademark) sheet 22 is placed on a base 21, and a RPC type 600 PPC sheet 23 is further superimposed on the Teflon (registered trademark) sheet 22. After the state was balanced, a load of 200 g was applied to make contact with the load, and the load Q (N) detected by the load cell 25 when the PPC paper 23 was transported at a pulling speed of 50 mm / min was obtained. Was measured. The measurement was performed in a normal temperature and normal humidity environment (NN: 23 ° C., 50% RH).

[Equation 1]
μ = Q (N) / (200 × 9.8)

  Further, the blade 2 was polished in the thickness direction by 0.1 mm, 0.2 mm, and 0.3 mm, respectively, and then the friction coefficient was measured in the same manner by the above equation. Table 1 shows the results.

  As a result, the rubber member of the example had a small initial coefficient of friction, maintained a low level of 1.0 or less even after polishing 0.1 mm, and was around 1.0 after polishing 0.2 mm. In Example 2, it was found that the surface treatment effect was completely eliminated by polishing by 0.1 mm.

[Examples 3 to 7]
Using a surface treatment solution obtained by adding 10, 20, 25, 30, and 40 parts by weight of an isocyanate compound (MD1: manufactured by Dainippon Ink and Chemicals, Inc.) to 100 parts by weight of ethyl acetate and stirring for 3 minutes, After washing the blades of the member for transport and accumulation with ethyl acetate, the surface treatment liquid was applied and impregnated on the blades with a brush, and then heat-treated at 120 ° C. for 60 minutes. It was used as a sheet transporting / stacking member. The dimensions of the accumulating member were such that eight blades each having a width of 5 mm and a thickness of 1 mm were radially provided in a cylindrical portion having an outer diameter of 70 mm and an inner diameter of 8 mm.

(Test Example 2)
The members for stacking and transporting the paper sheets of Examples 3 to 7 were rotated at 1200 rpm, and a 7.5 mm position from the root of the blade was hit against an iron plate to perform a durability test, and the time until the blade was cut was determined. Table 2 shows the results.

  As a result, the larger the isocyanate content of the surface treatment liquid with respect to the solvent, the shorter the durable time until cutting, and in order to achieve a durability of 100 hours or more in a durability test, the isocyanate content with respect to the solvent is 25% by weight or less. Was found to be preferable.

It is a schematic diagram showing the schematic structure of the member for paper sheet conveyance accumulation concerning one embodiment of the present invention. It is a figure explaining the method of friction coefficient measurement of the present invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Cylindrical part 2 Blade part 2a Surface treatment layer 21 Base 22 Teflon (registered trademark) sheet 23 PPC paper 24 Roller 25 Load cell

Claims (8)

Cylindrical cylindrical portion, a sheet transporting and stacking member having a plurality of radially extending blades provided on the outer peripheral surface of the cylindrical portion,
The blade portion has a surface treatment layer formed by impregnating a surface treatment liquid containing at least an isocyanate component on the surface of the blade portion made of an ester-based polyurethane, and a coefficient of friction of the surface of the blade portion with respect to PPC paper. Is 0.3 to 1.0. 2. The sheet transporting / accumulating member according to claim 1, wherein the surface treatment layer has permeated at least 30 [mu] m in a thickness direction from the surface of the blade portion. 3. The member according to claim 1, wherein the surface treatment liquid further contains at least one polymer selected from a fluorine-based polymer and a silicone-based polymer. 4. The sheet transporting / accumulating member according to claim 3, wherein the surface treatment liquid further contains carbon black dispersed therein. The paper sheet transport / accumulating member according to claim 4, wherein the carbon black in the surface treatment liquid is 10 to 40% by weight based on the isocyanate component. The paper sheet transport / accumulating member according to any one of claims 3 to 5, wherein the polymer in the surface treatment liquid is 2 to 30% by weight based on the isocyanate component. 7. The member according to claim 1, wherein the content of the isocyanate component in the surface treatment liquid is 25% by weight or less with respect to a solvent in the surface treatment liquid. . The paper sheet transport / accumulating member according to any one of claims 1 to 7, wherein the blade has a rubber hardness of 50 ° to 90 ° according to JIS A.

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