JP2003192171A - Flat belt for carrying paper sheets - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat belt for carrying paper sheets in which the modulus of elasticity in the longitudinal direction of the belt when the service temperature of the belt is low is not largely different from that at normal service temperature. <P>SOLUTION: A belt body 2 of the flat belt 1 for carrying paper sheets is formed of millable urethane rubber composition with at least carbon black mixed in millable urethane polymer. In the millable urethane polymer, ≥50 mass% to ≤100 mass% of the soft segment polyol is polycaprolacton ester. ≥30 mass% to ≤100 mass% of carbon black has grain size of ≥50 μm, and ≥10 pts.mass to ≤80 pts.mass of carbon black is mixed in 100 pts.mass millable urethane polymer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet conveying flat belt for conveying paper sheets such as banknotes and tickets.

[0002]

2. Description of the Related Art Generally, ATM (automated teller mac)
cash deposit machines such as hine) and CD (cash dispenser),
In automatic ticket gates and the like, paper sheets such as banknotes and tickets are conveyed in multiple directions while being sandwiched between a pair of flat belts for conveying paper sheets.

In Japanese Patent Laid-Open Publication No. 7-125866, a belt main body is formed of a millable urethane composition as a flat belt for conveying paper sheets, and a belt main body in which a knitted fabric or a woven fabric is embedded. It is disclosed.

Since such a flat belt for conveying paper sheets conveys the paper sheets on the surface of the belt, it is necessary to apply tension in the longitudinal direction of the belt in order to obtain a conveying force. Usually, in order to give such tension. It is used in a state where it is stretched in the longitudinal direction of the belt in advance.

[0005]

By the way, as described above, when the belt is stretched in the longitudinal direction in advance to a certain extent and the temperature at which the belt is used is changed, the physical properties of the millable urethane polymer forming the belt main body are also changed. When the elastic modulus in the longitudinal direction of the belt changes, the tension applied to the belt also changes accordingly. To drive the belt,
Generally, a motor is used. Therefore, it is necessary to select, as the motor, a motor having a driving force adapted to the maximum value of the belt tension when the belt use temperature is low. On the other hand, a belt driving motor is required to be compact, that is, to have a driving force as small as possible.

The present invention has been made in view of the above points, and an object of the present invention is to convey paper sheets in which the elastic modulus in the longitudinal direction of the belt when the temperature of use of the belt is low is not significantly different from that at room temperature. To provide a flat belt.

[0007]

According to the present invention, polycaprolactone ester accounts for 50% by mass or more and 100% by mass or less of the soft segment polyol of the millable urethane polymer forming the belt body.

Specifically, the present invention is premised on a flat belt for conveying paper sheets, the belt body of which is made of a millable urethane rubber composition prepared by mixing at least carbon black with a millable urethane polymer. In the millable urethane polymer, 50% by mass or more and 100% by mass or less of the soft segment polyol is polycaprolactone ester, and 30% by mass or more and 100% by mass or less of the carbon black has a particle diameter of 5
Millable urethane polymer 1 having a size of 0 μm or more and
It is characterized in that 10 parts by mass or more and 80 parts by mass or less are mixed with 00 parts by mass.

According to the above construction, the millable urethane polymer forming the belt main body is made of polycaprolactone ester, and the carbon black suitable for reducing the temperature dependence of the elastic modulus is used. Therefore, the change in the elastic modulus of the belt due to the change in the use temperature of the belt is small, so that the elastic modulus in the longitudinal direction of the belt when the use temperature of the belt is low is not much different from that at the normal temperature.

Here, when the polycaprolactone ester of the soft segment polyol of the millable urethane polymer is less than 50% by mass, the elastic modulus of the belt and the motor starting torque, and the ratio of the low temperature value to the normal temperature value of each. Becomes a big thing.

Further, the carbon black having a particle diameter of 50 μm or more of 30% by mass or more and 100% by mass or less is mixed with 10 parts by mass or more and 80 parts by mass or less of 100 parts by mass of the millable urethane polymer, whereby the reinforcing effect by the carbon black is obtained. And the elastic effect of the millable urethane polymer itself increase the elastic modulus of the belt especially at low temperatures. The carbon black having a particle size of 50 μm or more is 30% by mass or more because the particle size is 5
This is because if it is less than 0 μm, the elastic modulus and the starting torque of the belt become high especially at low temperature due to its reinforcing property.

With the above configuration, 24
It is also possible to set the ratio of the elastic modulus in the belt longitudinal direction at −5 ° C. to the elastic modulus in the belt longitudinal direction at − ° C. within a range of 100% or more and 130% or less in percentage.

Here, the "elastic modulus" means the initial inclination of the stress-strain curve in the longitudinal direction of the belt.

[0014]

As described above, according to the present invention,
The elastic modulus in the longitudinal direction of the belt when the temperature at which the belt is used is low may not be significantly different from that at room temperature.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows a flat belt 1 for conveying paper sheets according to an embodiment of the present invention.

The paper sheet conveying flat belt 1 is composed of a belt-shaped endless belt body 2 and a canvas 3 embedded in the surface layer of the belt body 2.

The belt body 2 is made of a polycaprolactone ester-based millable urethane polymer, that is, 50% by mass or more and 100% or more of the soft segment polyol.
A millable urethane composition in which carbon black, a cross-linking agent and other compounding agents are mixed and cross-linked to a millable urethane polymer whose mass% is polycaprolactone ester is formed.

Part 30 of the mixed carbon black
% To 100% by mass has a particle diameter of 50 μm or more and an oil absorption of 1.2 cm ³ / g or less, and the mixing amount is 10 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the millable urethane polymer.

The canvas 3 is, for example, 7.78 × 10 ⁻³ g /
A knitted fabric or woven fabric formed by a covering yarn in which 2.2 m × 10 ⁻³ g / m of polyester yarn is wrapped around m of polyurethane yarn is immersed in a resorcinol-formalin-latex (RFL) solution before belt formation. It is formed of a material that has been subjected to an adhesion treatment of drying.

The canvas 3 is embedded in the surface layer of the belt main body 2, but the yarns constituting the canvas 3 are partially exposed on the belt surface, and the yarns 3a, 3a, ... Are oriented in the longitudinal direction of the belt. As a result, the coefficient of friction between the paper sheet and the belt surface can be ensured to the extent that it does not hinder the conveyance, and the friction coefficient between the opposing belts is reduced to suppress the inconvenience such as heat generation. be able to.

In the flat belt 1 for conveying paper sheets, the ratio of the elastic modulus in the belt longitudinal direction at −5 ° C. to the elastic modulus in the belt longitudinal direction at 24 ° C. is 100% or more 1
Within the range of 30% or less.

Next, a method of manufacturing the flat belt 1 for conveying paper sheets will be described.

First, the surface of a cylindrical mold is covered with a canvas processed into a tubular shape, and an uncrosslinked millable urethane composition sheeted to a predetermined thickness (for example, about 0.6 mm) is covered therewith twice.

Then, the cylindrical mold in which the canvas and the uncrosslinked millable urethane are set is placed in a heating and pressing device, and the millable urethane is crosslinked by heating and pressurizing.

Subsequently, the cylindrical mold is taken out from the heating and pressing device, and after cooling, the belt precursor molded into a cylindrical shape is removed from the cylindrical mold.

Then, the millable urethane side of the belt precursor is polished to make the thickness uniform and a predetermined width is cut out, and the canvas side is turned upside down.

The flat belt 1 for conveying paper sheets having the above-mentioned structure uses a polycaprolactone ester type as the millable urethane polymer forming the belt main body 2, and the temperature dependence of the elastic modulus is small. Since the proper carbon black is used for this purpose, the change in the elastic modulus of the belt due to the change in the belt use temperature is small, and therefore the elastic modulus in the belt longitudinal direction when the belt use temperature is low is not much different from that at room temperature. Can be one.
Therefore, as the motor for driving the belt, it suffices to select a motor that can drive at room temperature.

[0029]

[Examples] A flat belt for transporting paper sheets was tested and evaluated.

<Test Evaluation Belt> The following flat belts for conveying paper sheets of Examples 1 to 8 were produced. Table 1 shows the respective configurations.

-Example 1-Processing aid 1 part by mass, zinc stearate 1 part by mass, hydrolysis stabilizer 2 parts by mass, particle size 62 μm and oil absorption per 100 parts by mass of polycaprolactone ester type millable urethane polymer. 20 parts by mass of carbon black A having an amount of 0.91 cm ³ / g, 6 parts by mass of conductive carbon black, 10 parts by mass of antiaging agent DBP, crosslinking agent TAIC3
Example 1 was a flat belt for conveying paper sheets formed by using an uncrosslinked millable urethane composition in which 6 parts by weight of dicumyl peroxide and 6 parts by weight of dicumyl peroxide were mixed.

Example 2-A flat belt for conveying paper sheets having the same structure as in Example 1 except that the mixing amount of carbon black A was 40 parts by mass was used as Example 2.

Example 3-Paper sheets having the same constitution as in Example 1 except that 60 parts by mass of carbon black B having a particle diameter of 70 μm and an oil absorption of 0.70 cm ³ / g was mixed in place of carbon black A. A flat belt for transportation was used as Example 3.

Example 4-A flat sheet conveying belt having the same structure as that of Example 3 except that the mixing amount of carbon black B was 90 parts by mass was used as Example 4.

Example 5-A flat belt for conveying paper sheets having the same structure as that of Example 1 except that an ethylene adipate-based millable urethane polymer was used was set as Example 5.

Example 6 A paper sheet having the same constitution as in Example 1 except that 20 parts by mass of carbon black C having a particle diameter of 30 μm and an oil absorption of 1.20 cm ³ / g was mixed in place of carbon black A. Example 6 is a flat belt for conveyance.

Example 7 A flat belt for conveying paper sheets having the same structure as in Example 1 except that a polyether-based millable urethane polymer was used was used as Example 7.

Example 8-1 part by weight of a processing aid, 1 part by weight of zinc stearate, and hydrolysis-stabilized with respect to 100 parts by weight of a millable urethane polymer composed of 40 parts by weight of a polycaprolactone ester type and 60 parts by weight of an ethylene adipate type. Agent 2 parts by mass, carbon black 20 parts by mass, conductive carbon black 6 parts by mass, antiaging agent DBP 10 parts by mass, crosslinking aid TAIC3
Example 8 was a flat belt for conveying paper sheets formed by using an uncrosslinked millable urethane composition in which 6 parts by mass of dicumyl peroxide and 6 parts by mass of dicumyl peroxide were mixed.

[0039]

[Table 1]

<Test Evaluation Method> For the flat belts for conveying paper sheets of Examples 1 to 8, the elastic modulus in the longitudinal direction of the belt at a belt operating temperature of -5 ° C (at low temperature) and the belt operating temperature of 24 ° C (at room temperature) ), The elastic modulus in the longitudinal direction of the belt was measured, and
The elastic modulus ratio at 5 ° C. was calculated as a percentage.

For the flat belts for conveying paper sheets of Examples 1 to 8, the motor starting torque at the belt operating temperature of -5 ° C (low temperature) and the motor starting torque at the belt operating temperature of 24 ° C (normal temperature) were measured. With measurement, 24
The ratio of the starting torque at -5 ° C to the starting torque at 0 ° C was calculated as a percentage. As shown in FIG. 2, the belt 1 is wound around the crown pulley having a diameter of 30 mm as the drive pulley 13 and the driven pulley 14 in a state of being stretched by 5%, and the motor 15 is started to measure the torque at that time. It was measured at. Then, the starting torque T was obtained as a difference T = T1-T2 between the maximum torque T1 at the time of starting with the belt attached and the maximum torque T2 at the time of starting without the belt.

<Test Evaluation Results> Table 1 shows the test evaluation results.

According to the same table, as the millable urethane polymer forming the belt body, a polycaprolactone ester type is used, and carbon black having a relatively large particle size is used in an amount of 20, 40, 60 per 100 parts by weight of the millable urethane polymer. In Examples 1 to 3 in which parts by mass are mixed,
The difference between the elastic modulus at 5 ° C and the elastic modulus at 24 ° C is relatively small, and the ratio of the former to the latter is 100% or more in percentage 13
It is in the range of 0% or less. It is considered that this is because the elastic modulus of the belt is increased particularly at low temperature due to the synergistic effect of the reinforcing effect of carbon black and the rigidity increase of the millable urethane polymer itself.

On the other hand, Example 4 in which 90 parts by mass of carbon black B having a particle size of 70 μm and an oil absorption of 0.7 cm ³ / g was mixed with 100 parts by mass of the polycaprolactone ester-based millable urethane polymer, Example 5 using ethylene adipate-based millable urethane polymer, particle size 30 μm and oil absorption 1.2 c
In Example 6 using carbon black C of m ³ / g and Example 7 using a millable urethane polymer having a polyether diameter, the difference between the elastic modulus at −5 ° C. and the elastic modulus at 24 ° C. is compared. The ratio of the former to the latter is 150% or more in percentage. These tendencies are also observed in the motor starting torque. For Example 6, the particle size is 50
It is considered that the carbon black of less than μm increases the elastic modulus and the starting torque of the belt especially at low temperature due to its reinforcing property.

From the above, by using a polycaprolactone ester type as the millable urethane polymer forming the belt body and mixing an appropriate amount of carbon black having a relatively large particle diameter, the belt can be used at a low temperature such as -5 ° C. It was confirmed that the elastic modulus in the longitudinal direction of the belt can be made not so different from that at room temperature (24 ° C.). From the carbon blacks A to C, it is estimated that the particle size of carbon black should be 50 μm as the main component, that is, 30% by mass or more and 100% by mass or less of the total carbon black. . Further, from Examples 1 to 4, it is estimated that the amount of carbon black to be mixed needs to be 10 parts by mass or more and 80 parts by mass or less with respect to 100 parts by mass of the millable urethane polymer.

In Example 8, a polycaprolactone ester type was used as the millable urethane polymer forming the belt body, but the elastic modulus at -5 ° C and 24
The difference from the elastic modulus at ° C is relatively large, and the ratio of the former to the latter is 150% in percentage. The motor starting torque has the same tendency. Example 1 and Example 8 have the same composition except the composition of the millable urethane polymer, but the former is 100% by mass.
While it is of the polycaprolactone ester type,
The latter is 40% by mass of polycaprolactone ester and is 60
% Ethylene adipate system. This means that it is necessary that the millable urethane polymer contains at least 40 mass% of polycaprolactone ester type. In order to obtain the effect of the polycaprolactone ester-based millable urethane polymer, it is necessary that the main component is a polycaprolactone ester-based one, that is, 50% by mass or more of the polycaprolactone ester-based one is required. Guessed.

[Brief description of drawings]

FIG. 1 is a perspective view of a flat belt for conveying paper sheets according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a motor starting torque measuring device.

[Explanation of symbols]

1 Flat belt for conveying paper sheets 2 Belt body 3 canvas 3a Thread 13 Drive pulley 14 Driven pulley 15 motor 16 Torque meter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoko Asami             3-2-15 Meiwa Dori, Hyogo-ku, Kobe City, Hyogo Prefecture               Bando Chemical Co., Ltd. F term (reference) 3F049 BA11 LA08 LB04                 4J002 CK031 DA036 GM01

Claims (2)

[Claims] 1. A flat belt for conveying paper sheets, the belt body of which is formed of a millable urethane composition obtained by mixing at least carbon black with a millable urethane polymer, wherein the millable urethane polymer is a soft segment polyol of the soft segment polyol. Among them, 50% by mass or more and 100% by mass or less is a polycaprolactone ester, and 30% by mass or more and 100% by mass or less of the carbon black has a particle diameter of 50 μm or more and is 10% by mass with respect to 100 parts by mass of the millable urethane polymer. A flat belt for conveying paper sheets, which is mixed in an amount of 1 part or more and 80 parts by mass or less. 2. The flat belt for transporting paper sheets according to claim 1, wherein the elastic modulus in the belt longitudinal direction at 24 ° C. is −5 ° C.
The elastic modulus ratio in the longitudinal direction of the belt is 100 in percentage.
% To 130% or less, a flat belt for transporting paper sheets.