JP2007153461A - Rubber member for conveying paper sheets - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rubber member for conveying paper sheets capable of maintaining paper sheet conveying property and preventing static electricity when the paper sheets are conveyed. <P>SOLUTION: In the rubber member for conveying the paper sheets, 1-7 parts by weight of at least two kinds or more of cation base surfactants having different alkyl chain lengths as an anti-static agent is blended to 100 parts by weight of a rubber base material. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper sheet conveying rubber member such as an endless belt for conveying a paper sheet or a rubber roll for conveying in an automatic ticket gate, a cash deposit payment machine, a money change machine, or the like. Paper sheets are a concept including various paper, PPC, various films, magnetic cards, tickets, banknotes, coins, and the like.

  Conventionally, in automatic ticket gates, cash deposit machines, currency exchange machines, automatic ticket issuing machines, banknotes, magnetic cards, tickets, etc. are sandwiched between belts arranged opposite to each other, and are sandwiched between the belts. Be transported. That is, for example, as shown in FIG. 4, the paper sheet transport belts 01 and 02 are stretched over a pair of pulleys 03a, 03b and 04a, 04b, respectively, and are arranged to face each other. Is conveyed by a pinching force between a pair of rotationally driven paper sheet conveying belts 01 and 02.

  As this kind of belt, bills, magnetic cards, tickets, etc. are smoothly transferred in the apparatus, so that the surface is smooth and not sticky, has sufficient elastic force, Has a sufficient tearing force so that it does not tear by contact, and has a large elongation and a small initial tension so that the allowable range of the interaxial distance between pulleys can be taken, and has a sufficient durability performance. It is necessary to prevent troubles caused by static electricity.

  Conventionally, in order to prevent such troubles caused by static electricity, the belt itself is imparted with conductivity (for example, refer to Patent Document 1), or a static electricity can be added by adding an antistatic agent. A countermeasure (for example, refer to Patent Document 2) for preventing charging such as the above has been taken.

  However, it is possible to repeat transport without removing the static electricity generated with the increase in the transport speed of the paper sheets, for example, when the paper sheets are stored, the paper sheets are not aligned, In some cases, paper sheets may be wound around the belt, and further countermeasures against static electricity are required.

JP 2002-255386 A JP-A-11-334923

  In view of the circumstances described above, it is an object of the present invention to provide a paper sheet transport rubber member that maintains paper sheet transportability and can prevent static electricity when transporting paper sheets.

  According to a first aspect of the present invention for achieving the above object, in the rubber member for transporting a paper sheet for transporting the paper sheet, at least two different alkyl chain lengths as an antistatic agent with respect to 100 parts by weight of the rubber base material. One or more kinds of cationic surfactants are blended in an amount of 1 to 7 parts by weight.

  According to a second aspect of the present invention, there is provided the rubber member for transporting paper sheets according to the first aspect, wherein the cationic surfactant is a quaternary ammonium salt. It is in.

A third aspect of the present invention is a rubber member for conveying paper sheets according to the second aspect, at least 1 kind alkyl chain length C ₁₆ or more, at least one alkyl chain of the quaternary ammonium salt The rubber member for transporting paper sheets has a length C of ₁₅ or less.

  According to a fourth aspect of the present invention, there is provided a paper sheet conveying rubber member according to any one of the first to third aspects, wherein a paper sheet is used instead of a test piece in the frictional voltage measurement method defined in JIS L1094. And the average value of the charged voltage from the start of the test to 1 minute later when using the rubber member for transporting paper sheets instead of the friction cloth is 100 V or less. It is in a rubber member.

According to a fifth aspect of the present invention, there is provided the rubber member for transporting paper sheets according to the fourth aspect, wherein the surface electrical resistance is 10 ⁸ Ω or less.

  According to a sixth aspect of the present invention, there is provided the rubber member for conveying paper sheets according to the fourth or fifth aspect, wherein the friction coefficient is 0.7 or more. .

  According to a seventh aspect of the present invention, there is provided the rubber member for conveying paper sheets according to any one of the first to sixth aspects, wherein the rubber member for conveying paper sheets is an endless belt for conveying. .

  According to an eighth aspect of the present invention, there is provided the rubber member for transporting paper sheets, wherein the rubber member for transporting paper sheets according to any one of the first to sixth aspects is a transport rubber roll.

  According to the present invention, there is an effect that it is possible to provide a rubber member for paper sheet transport that can maintain paper sheet transportability and can prevent static electricity when transporting the paper sheet.

  The rubber member for transporting paper sheets of the present invention comprises 1 to 7 parts by weight of at least two kinds of cationic surfactants having different alkyl chain lengths as an antistatic agent per 100 parts by weight of the rubber base material. It is what. By incorporating a cationic surfactant in this range into the rubber base material, it is possible to obtain a rubber member for paper sheet conveyance in which charging is prevented. If the amount of the cationic surfactant exceeds this range, the antistatic effect does not remarkably improve and the characteristics tend to deteriorate. If the amount is less than this range, the antistatic effect is not exhibited. The blending amount of the cationic surfactant is particularly preferably 3 to 5 parts by weight.

  In addition, the cationic surfactant according to the present invention contains at least two types having different alkyl chain lengths. Specifically, it is preferable to use a short alkyl chain and a long alkyl chain. In order to enhance the antistatic effect of the rubber member for transporting paper sheets, it is preferable to use an antistatic agent having a short alkyl chain length in order to promote the bleeding property of the antistatic agent. When the surface is covered with a bleed antistatic agent, the friction coefficient is lowered, and the transportability of the paper sheet is lowered. Therefore, paper having a long alkyl chain length that has a large bleed to the rubber member surface of the antistatic agent but has a high antistatic effect and a long alkyl chain length that is difficult to bleed and has a relatively small antistatic effect can be used. It is possible to provide a paper sheet conveying rubber member that maintains the conveyance of leaves and prevents charging.

  The cationic surfactant according to the present invention is preferably a quaternary ammonium salt. Examples of the quaternary ammonium salt include a monoalkyl type and a dialkyl type, and are not particularly limited.

Furthermore, in at least one of the quaternary ammonium salt is an alkyl chain length of C ₁₆ or more, it is preferable that at least one is less than the alkyl chain length of C _15. The more than alkyl chain length C _16, for example, cetyl group, stearyl group, arachinyl group, and Beheshiru group. Examples of the following alkyl chain length C _15, for example, nonyl group, lauryl group, myristyl group Etc. Relatively antistatic effect is small by using a quaternary ammonium salt of the alkyl chain length is difficult to bleed more than C _16, a larger C ₁₅ following quaternary ammonium salts of the bleed easily, but relatively antistatic effect, paper It is possible to provide a paper sheet conveying rubber member that maintains the conveyance of leaves and prevents charging.

  The material of the rubber member constituting the paper sheet conveying rubber member in the present invention is not particularly limited as long as it is a material conventionally used for a paper sheet conveying roll or a paper sheet conveying belt. For example, EPDM, nitrile rubber, polyurethane and the like can be exemplified.

  For example, in the case of a paper sheet conveying belt, it is preferable to use millable urethane, particularly caprolactone-based millable urethane. This is because the belt surface wear and the adhesiveness accompanying the wear can be almost eliminated, and the paper sheets can be transported stably over a long period of time.

  In addition, in the case of the rubber belt for paper sheets conveyance, a reinforcing core body can also be embedded in a belt as needed. As the reinforcing core, one having a high Young's modulus is preferably used, and examples thereof include cotton yarn, nylon yarn, polyester yarn, aromatic polyamide yarn, and glass fiber. Further, a tubular body having a large stretchability of 0.1 mm to 1.0 mm thickness obtained by knitting nylon false twisted yarn with a knitting machine can be used as the core body.

  In addition, the rubber member for transporting paper sheets of the present invention uses a paper sheet instead of a test piece in the friction band voltage measurement method defined in JIS L1094 and uses a paper sheet transport rubber member instead of a friction cloth. It is preferable that the average value of the charged voltage from the start of the test to 1 minute after is 100 V or less. In other words, conventionally, measures have been taken to reduce static electricity by reducing the electrical resistance value or prevent static electricity from being charged, and it has been unknown in advance which measures are effective in actual equipment. The rubber member for transporting paper sheets of the present invention applies JIS L1094, which is a chargeability test for woven fabrics and knitted fabrics, and uses paper sheets in place of test pieces and the rubber members in place of friction cloths. When the charged voltage is maintained at 100 V or less after 1 minute, troubles caused by static electricity in the actual machine can be surely prevented.

  In other words, the charging characteristics of rubber members for transporting paper sheets, which could not be determined because there was no standard for judgment in the past, were determined in advance by applying a chargeability test for woven fabrics and knitted fabrics, and troubles caused by static electricity in the actual machine were reliably eliminated. .

  The method for measuring the charged voltage by the friction charged voltage measuring method defined in JIS L1094 according to the present invention is as follows.

  For this measurement, a rubber member 1 formed into a sheet shape is disposed using a frictional voltage measuring machine as shown in FIG. The rubber member 1 is a friction cloth in an original test, and is held on both sides by a friction cloth grip 2 and held at a predetermined tension by a load 3. In addition, a rotating drum 4 is disposed above the rubber member 1, and a paper sheet 6, for example, a bill is attached in a test piece mounting frame 5 provided on the outer periphery of the rotating drum 4. The rotating drum 4 is rotationally driven by a motor 7.

  On the other hand, a power receiving unit 8 is disposed on the side of the rotating drum 4, and a signal from the power receiving unit 8 is amplified by an amplifier 9.

The rubber member for transporting paper sheets of the present invention has conductivity by adding a conductivity-imparting agent, such as conductive carbon, and further by adding an ionic conductivity-imparting agent. Is preferably 10 ⁸ Ω or less. In addition, although the addition amount of an electroconductivity imparting agent changes with the kinds, when using conductive carbon, it is preferable to add 10 weight part with respect to a rubber material. This is to provide sufficient electrical conductivity to promote the removal of charged static electricity.

  Further, the rubber member for paper sheet conveyance preferably has a friction coefficient of 0.7 or more. This is because if the friction coefficient is less than 0.7, the transportability of the paper sheet is lowered.

  Hereinafter, although one specific example will be described, it goes without saying that the present invention is not limited to this example.

Example 1
100 parts by weight of a millable urethane composed of poly-ε-caprolactone-based diol and MDI (4,4′-diphenylmethane diisocyanate), 5 parts by weight of a peroxide crosslinking agent Parkmill D-40 (trade name; manufactured by NOF Corporation), conductive 20 parts by weight of functional carbon black, 1 part by weight of quaternary ammonium salt of alkyl chain length C ₁₂ and 1 part by weight of quaternary ammonium salt of alkyl chain length C ₁₆ as an antistatic agent, and vulcanized Thus, an endless belt for conveyance was obtained.

(Example 2)
Except that quaternary ammonium salt of alkyl chain length C ₁₆ it was used 2 parts by weight to obtain a transporting endless belt in the same manner as in Example 1.

(Example 3)
Except for using 3 parts by weight of quaternary ammonium salts of alkyl chain length C ₁₆ got transporting endless belt in the same manner as in Example 1.

Example 4
Quaternary ammonium salts of alkyl chain length C ₁₆ except using 0.5 parts by weight to obtain a transporting endless belt in the same manner as in Example 1.

(Example 5)
1.5 parts by weight of quaternary ammonium salts of alkyl chain length C _12, to obtain a transporting endless belt except that quaternary ammonium salt of alkyl chain length C ₁₆ was used 0.5 part by weight in the same manner as in Example 1 It was.

(Comparative Example 1)
Without using the quaternary ammonium salts of alkyl chain length C _16, quaternary ammonium salts of alkyl chain length C ₁₂ except using 0.5 parts by weight to obtain a transporting endless belt in the same manner as in Example 1 .

(Comparative Example 2)
Without using the quaternary ammonium salts of alkyl chain length C _12, quaternary ammonium salts of alkyl chain length C ₁₆ except using 0.5 parts by weight to obtain a transporting endless belt in the same manner as in Example 1 .

(Comparative Example 3)
0.25 parts by weight of the quaternary ammonium salts of alkyl chain length C _12, to obtain a transporting endless belt except that quaternary ammonium salt of alkyl chain length C ₁₆ was used 0.25 parts by weight in the same manner as in Example 1 It was.

(Comparative Example 4)
4 parts by weight of quaternary ammonium salts of alkyl chain length C _12, except for using 4 parts by weight of quaternary ammonium salts of alkyl chain length C ₁₆ got transporting endless belt in the same manner as in Example 1.

(Comparative Example 5)
Without using the quaternary ammonium salts of alkyl chain length C _16, except for using 3 parts by weight of quaternary ammonium salts of alkyl chain length C ₁₂ got transporting endless belt in the same manner as in Example 1.

(Comparative Example 6)
Except for not using the quaternary ammonium salts of alkyl chain length C ₁₂ got transporting endless belt in the same manner as in Example 3.

(Comparative Example 7)
Without the use of quaternary ammonium salts quaternary ammonium salts and alkyl chain length C ₁₆ alkyl chain length C _12, except that blending 3 parts by weight of quaternary ammonium salts of alkyl chain length C ₂₂ is the same manner as in Example 1 Thus, an endless belt for conveyance was obtained.

(Test example)
Using the frictional voltage measuring machine shown in FIG. 1 and using the belts of the examples and comparative examples as the rubber member 1 formed into a sheet shape, at 20 ° C. and 40% RH, from the start of the test to 1 minute later The charged voltage was measured and the average value was obtained. The results are shown in Table 1.

  Further, the surface electric resistance value and the friction coefficient of the endless belt were measured. The results are shown in Table 1. The coefficient of friction was measured by the following method.

As shown in FIG. 2, a Teflon (registered trademark) sheet 22 is placed on a base 21, and a PPC paper 23 of Ricoh type 600 is further stacked thereon, and an endless belt 10 for conveyance is placed thereon. Then, after balancing and fixing in an unweighted state, a load of 200 g is added and brought into contact, and the load Q (N) detected by the load cell 25 when the PPC paper 23 is conveyed at a pulling speed of 200 mm / min is obtained. The friction coefficient as an initial state was measured from the following formula. The measurement was performed in a normal temperature and humidity environment (NN: 23 ° C., 50% RH).
[Equation 1]
μ = Q (N) / (200 × 9.8)

  Further, the endless belts of the examples and comparative examples were mounted on a belt running tester, and the antistatic effect and the paper sheet transportability were examined.

  As shown in FIG. 3, the belt running tester has one drive roll 31 and a plurality of driven rolls 32. The endless belts of each example and each comparative example were set as the driving belt 10A and the driven belt 10B of the belt running test machine so that the belt tension ratio was 10%. Banknotes were conveyed at a belt speed of 1600 mm / s, and the antistatic effect and paper sheet conveyance properties were evaluated. In addition, the conveyed banknote is accommodated in the banknote storage box which is not shown in figure.

  Table 1 shows the results of the antistatic effect and paper sheet transportability. The antistatic effect was evaluated as “◯” when the banknotes were aligned with the banknote storage box without being wrapped around the endless belt, and “X” when the banknotes were wrapped around the endless belt or not aligned with the banknote storage box. Further, the paper sheet transportability was determined as “◯” when the belt speed was maintained at the above-described value, and “X” when the speed varied.

(Summary of results)
As a result, the surface electric resistance values are all conductors of 10 ⁸ Ω or less, and no difference between the examples and the comparative examples can be found. The measured value was 100 V or less and the friction coefficient was 1.20, whereas in Comparative Examples 1 to 3, 6 and 7, the measured friction band voltage exceeded 100 V, and in Comparative Examples 4 and 5, the friction coefficient was 0. .7 or less.

  Moreover, when it mounted in the belt running test machine, when it conveyed using the endless belt for conveyance of Examples 1-5 whose frictional voltage measured value is 100 V or less, abnormality was not discovered by the banknote after conveyance. In contrast, when transported using the transport endless belts of Comparative Examples 1-3, 6 and 7 in which the measured frictional voltage was 100 V or more, the transported banknotes were greatly charged and aligned. I could n’t bundle them. Further, in Comparative Examples 4 and 5 in which the friction coefficient was less than 0.7, the conveyance force was insufficient and the paper sheets were not conveyed well.

  From this result, as in the present invention, paper sheets containing 1 to 7 parts by weight of at least two kinds of cationic surfactants having different alkyl chain lengths as an antistatic agent with respect to 100 parts by weight of a rubber substrate. It can be seen that by using the rubber member for conveyance, it is possible to maintain the sheet conveyance property and prevent static electricity when conveying the sheet.

It is a figure for demonstrating the friction voltage measurement method concerning this invention. It is a figure explaining the method of the friction coefficient measurement of a test example. It is the schematic which shows the belt running test machine of a test example. It is the schematic which shows notionally an example of the use condition of the rubber member for paper sheets conveyance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rubber member 2 Friction cloth grip 3 Load 4 Rotating drum 5 Test piece mounting frame 6 Paper sheet 7 Motor 8 Power receiving part 10 Endless belt for conveyance 10A Drive belt 10B Drive belt 21 Base 22 Teflon (registered trademark) sheet 23 PPC paper 25 Load cell 31 Drive roll 32 Driven roll

Claims (8)

1 to 7 parts by weight of at least two kinds of cationic surfactants having different alkyl chain lengths as an antistatic agent in 100 parts by weight of a rubber base material in a rubber member for transporting paper sheets A rubber member for transporting paper sheets, characterized in that it is blended. The rubber member for paper sheet conveyance according to claim 1, wherein the cationic surfactant is a quaternary ammonium salt. In rubber member for conveying paper sheets according to claim 2, and characterized in that at least one of said quaternary ammonium salt with an alkyl chain length of C ₁₆ or more, at least one is less than the alkyl chain length of C ₁₅ Rubber member for transporting paper sheets. The rubber member for transporting paper sheets according to any one of claims 1 to 3, wherein a paper sheet is used instead of a test piece in the friction band voltage measurement method defined in JIS L1094, and the friction cloth A rubber member for transporting paper sheets, wherein an average value of the charged voltage from the start of the test to one minute later when using the rubber member for transporting paper sheets is 100 V or less. The rubber member for transporting paper sheets according to claim 4, wherein the surface electrical resistance is 10 ⁸ Ω or less. The rubber member for paper sheet conveyance according to claim 4 or 5, wherein a friction coefficient is 0.7 or more. The rubber member for transporting paper sheets according to any one of claims 1 to 6, wherein the rubber member for transporting paper sheets is an endless belt for transporting paper. The rubber member for transporting paper sheets according to any one of claims 1 to 6, wherein the rubber member for transporting paper sheets is a rubber roll for transporting paper.

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