JP4232894B2 - Endless belt for conveyance - Google Patents

Description

【００６０】
以上の結果、実施例の搬送用ベルトは初期の摩擦係数も小さく、０．１ｍｍ研磨後にも０．５以下という低水準を維持し、０．２ｍｍ研磨後も１以下であったが、比較例では０．１ｍｍ研磨すると、表面処理効果が全くなくなることがわかった。
【００６１】
（試験例２）
実施例と同様なベルトを図３のベルト張力変化率測定装置に、駆動ベルト１０Ａ及び従動ベルト１０Ｂとしてセットした。張力変化率測定装置は、１つの駆動ロール２１と、複数の従動ロール２２を有し、駆動ベルト１０Ａ及び従動ベルト１０Ｂを所定の張力でセットし、駆動ロール２１をベルトスピード１．５ｍ／ｓｅｃで所定時間走行させるものである。張力変化は、初期にセットしたベルト長での引張り張力と、所定時間走行した後の引張り張力とを測定し、張力の変化率を求めたところ、図４の結果が得られた。
【００６２】
この結果、本実施例の搬送用ベルトの張力保持率は、走行時間２０００ｈｒ経過後でも７５％以上あることがわかった。
【００６３】
【発明の効果】
以上説明したように、本発明によると、ポリウレタンからなるベルト本体の少なくとも搬送面に、少なくともイソシアネート成分を含有する表面処理液を含浸させることにより形成された表面処理層を有するので、ある程度摩耗しても低摩擦係数が維持でき、また、表面処理液の組成により比較的容易に所望の摩擦係数に調整できるという効果を奏する。
【図面の簡単な説明】
【図１】摩擦係数測定の方法を示す図である。
【図２】摩擦係数測定結果を示す図である。
【図３】張力変化率測定装置を示す図である。
【図４】張力変化率測定結果を示す図である。
【符号の説明】
１ 固定基台
２ 固定軸
３ 可動基台
４ 可動軸
５ 金属支持板
６ ＳＵＳ板
７ ＰＰＣ用紙
８ ロードセル
１０ 搬送用ベルト
１０Ａ 駆動ベルト
１０Ｂ 従動ベルト
２１ 駆動ロール
２２ 従動ロール[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an endless belt for conveying a magnetic card, a coin, and the like in an automatic ticket gate, a cash deposit payment machine, a money changer, and the like.
[0002]
[Prior art]
Conventionally, in automatic ticket gates, cash deposit machines, money changers, etc., banknotes, films, magnetic cards, tickets, etc. are sandwiched between belts arranged opposite to each other and conveyed by the clamping force between the belts. The The paper sheet transport roll used in such a part may perform a process of reducing the friction coefficient to some extent in order to reduce the surface tackiness. For example, when transporting banknotes upward, etc. Requires a certain coefficient of friction.
[0003]
On the other hand, in the case of a conveyor belt that conveys the magnetic card to the position of the magnetic head that reads information on the magnetic card, the belt is always in sliding contact with the magnetic head, so that a belt having an extremely reduced friction coefficient is required.
[0004]
As such a belt having a reduced coefficient of friction, a belt with a fluorine-based or silicone-based coating, a belt treated with a fluorine-based reactive processing liquid or a silicone-based reactive processing liquid (see Patent Publication 1), chlorine And the like (see Patent Document 2).
[0005]
[Patent Document 1]
JP-A-9-104541 [Patent Document 2]
Japanese Patent Laid-Open No. 7-101585
[Problems to be solved by the invention]
However, in the processed product as described above, there is a problem that the friction coefficient does not sufficiently decrease or the friction coefficient increases due to wear due to continuous use even if it decreases.
[0007]
Therefore, in view of such circumstances, it is an object of the present invention to provide an endless belt for conveyance that can be adjusted to a desired friction coefficient relatively easily and can maintain a low friction coefficient even when worn to some extent.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention for achieving the above object, in a transport endless belt for transporting a transported body, at least a transport surface of a belt body made of polyurethane is impregnated with a surface treatment liquid containing at least an isocyanate component. The endless belt for conveyance has the surface treatment layer formed by the above-described method, and the friction coefficient with respect to the PPC paper of the initial state and the surface after 30 μm wear is 1 or less.
[0009]
According to a second aspect of the present invention, in the first aspect, the surface treatment liquid further contains at least one polymer selected from a fluorine-based polymer and a silicone-based polymer. Located on the endless belt for conveyance.
[0010]
According to a third aspect of the present invention, there is provided the endless belt for conveyance according to the second aspect, wherein the surface treatment liquid is a dispersion of carbon black.
[0012]
A fourth aspect of the present invention is the endless belt for conveyance according to any one of the first to third aspects, wherein the coefficient of friction with respect to the PPC paper on the surface after 100 μm wear is 0.5 or less. .
[0013]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, there is provided an endless belt for conveyance which has a surface treatment layer on a side opposite to the conveyance surface.
[0014]
According to a sixth aspect of the present invention, in the fifth aspect, the endless belt for conveyance is characterized in that a difference between the friction coefficient of the conveyance surface and the friction coefficient of the opposite surface is 0.3 or more. .
[0015]
A seventh aspect of the present invention is the endless belt for conveyance according to any one of the first to sixth aspects, wherein a core body is embedded in the belt body.
[0016]
According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the tension retention after 100 hours is 60% or more with the belt body extended by 10%. Located on an endless belt.
[0017]
A ninth aspect of the present invention is an endless belt for conveyance according to any one of the first to eighth aspects, wherein the rubber hardness of the belt body is 50 to 90 ° according to JIS A.
[0018]
Embodiment of the first 0 of the present invention, in any one of the aspects of the first through 9 in transporting endless belt, wherein the surface roughness Rz of the conveying surface is 10μm or less.
[0019]
The surface treatment layer formed on at least the conveyance surface of the belt main body of the endless belt for conveyance according to the present invention is provided integrally with the belt main body by impregnating at least a part of the belt main body made of polyurethane. That is, such a surface treatment layer is formed by a surface treatment liquid in which a fluorine-based polymer or a silicone-based polymer and further carbon black are added to an isocyanate component as necessary, and a surface treatment liquid in which a solvent is added to the surface treatment liquid. Since the surface treatment layer is formed by impregnation, the surface treatment layer is integrally formed so as to gradually become 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 isocyanate reacts with a urethane bond to produce allohanate, uretidione, nurate and the like and binds firmly. Moreover, since the isocyanate component in the surface treatment liquid reacts with the isocyanate of the rubber elastic layer and is firmly integrated, problems such as peeling are further avoided.
[0020]
In addition, since the surface treatment layer of the present invention is formed from a surface treatment liquid in which a fluorine-based polymer or a silicone-based polymer is added to an isocyanate component, it is more elastically deformed than a coating layer formed from a fluorine resin or a silicone resin. There is also an advantage that the rubber elastic body is not easily cracked.
[0021]
Such a surface treatment layer of the present invention is impregnated from the surface of the belt main body by 30 μm or more, preferably 0.1 mm or more. Therefore, although it has a low coefficient of friction in the initial stage, it is 30 μm or more, and further 0.1 mm. The low friction coefficient is maintained even after being worn, and the friction coefficient with respect to the PPC paper on the surface in the initial state and after 30 μm wear is 1 or less.
[0022]
In addition, the surface treatment liquid of the present invention is relatively prepared by adjusting the components such as when only an isocyanate component is used, when a fluorine-based polymer or a silicone-based polymer is added thereto, or when carbon black is added. The coefficient of friction can be easily changed. For example, when treated with only the isocyanate component, the friction coefficient against PPC paper is 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 select suitably according to a use.
[0023]
Here, the friction coefficient with respect to the PPC paper in the present invention is measured by the method of the following test example.
[0024]
The polyurethane used in the belt main body of the endless belt for conveyance of the present invention is not particularly limited as long as it satisfies the original characteristics of the belt. In particular, a polyol containing poly-ε-caprolactone diol and a polyisocyanate It is preferable to use a kneaded polyurethane obtained from the reaction with. This is because it is excellent in various properties such as wear resistance.
[0025]
The rubber hardness of the belt body is about 50 to 90 ° according to JIS A. Moreover, it is preferable that the tension retention after 100 hours is 60% or more in a state where the belt body is stretched by 10%. If it is less than this, the inherent durability of the belt is insufficient.
[0026]
A core body may be embedded in the belt body. Examples of the core 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.
[0027]
Furthermore, the surface roughness Rz of the conveying surface of the belt is not particularly limited, but is preferably 10 μm or less.
[0028]
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.
[0029]
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, dimer to trimer of these isocyanate compounds, and those obtained by prepolymerization of the isocyanate compound alone or together with the polyol can also be used.
[0030]
In addition, the fluorine-based polymer and the silicone-based polymer are soluble in a predetermined solvent and can be chemically bonded by reacting with an isocyanate compound, and it is particularly preferable to use an acrylic fluorine-based polymer or an acrylic silicone-based polymer. .
[0031]
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 examples thereof include block copolymers of acrylic acid esters and fluorinated alkyl acrylates and derivatives thereof. be able to. The acrylic silicone polymer is a solvent-soluble silicone polymer, and examples thereof include block copolymers of acrylic acid esters and acrylic acid siloxane esters, and derivatives thereof. In the present invention, these polymers are used alone or in combination.
[0032]
Solvents that can be used in the present invention include ethyl acetate, methyl ethyl ketone (MEK), toluene, acetone, cyclohexanone, and other reactive diluents such as 2-hydroxyethyl acrylate, tetrahydrofurfuryl acrylate, 2-hydroxy. Any polymer component 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, trimethylolpropane triacrylate, and the like.
[0033]
The surface treatment layer of the present invention can further reduce the friction coefficient by containing carbon black. Such carbon black can be fixed in the surface treatment layer by forming the surface treatment layer in a state dispersed in the surface treatment liquid.
[0034]
Here, as the carbon black, for the purpose of reducing the friction coefficient, carbon black having no electrical conductivity may be used. On the contrary, by adding the conductive carbon black, the surface treatment layer may be used. Thus, conductivity can be imparted. Examples of the conductive carbon black include ketjen black (manufactured by Lion Corporation) and talker black # 5500 (manufactured by Tokai Carbon Corporation).
[0035]
The carbon black in the surface treatment liquid is preferably 40% by weight or less based on the isocyanate component. If the amount is too much, problems such as dropping off are caused, which is not preferable. In order to impart conductivity, it is preferable to add 10% by weight or more.
[0036]
Moreover, it is preferable that content of the polymer in a surface treatment liquid shall be 2-30 weight% with respect to an isocyanate component. If it is less than this, the effect of retaining the carbon black in the surface treatment layer will be small, and if it is too much, the isocyanate component will be relatively small and an effective surface treatment layer cannot be formed, which is not preferable.
[0037]
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 on at least the conveying surface of the belt body.
[0038]
The surface treatment liquid can be impregnated and applied by brushing, spraying, dipping, or the like. For example, it is preferable to impregnate only the conveying surface, but the entire surface may be impregnated.
[0039]
Such a surface treatment layer of the present invention may be provided at least on the conveying surface, and conversely, in order to prevent slippage with the pulley, it is preferably not formed on the pulley contact surface.
[0040]
Thus, the endless belt for conveyance of the present invention has a surface treatment layer at least on the conveyance surface and has a reduced coefficient of friction on the conveyance surface. Basically, the back surface side opposite to the conveyance surface is It is better to maintain a high friction coefficient in order to maintain the conveying force, or a surface treatment may be performed as necessary to reduce the friction coefficient. In this case, the same surface treatment as that on the front surface side may be performed, but a different surface treatment liquid may be used to perform a different surface treatment so that the friction coefficient between the transport surface and the back surface is different.
[0041]
For example, in the case of an endless belt for transporting coins, there is a mechanism in which a metal plate is placed under the belt so that the belt does not bend due to the weight of the coin. Therefore, it is necessary to reduce the friction coefficient on the back side of the belt in order to prevent the belt from rotating. Therefore, for example, the conveying surface is surface-treated with a surface treatment liquid mainly containing an isocyanate to make the friction coefficient about 0.7, while the back side is made to contain an acrylic fluorine-based polymer together with isocyanate to make the friction coefficient 0. .3 or so can cope with the case described above.
[0042]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although a specific Example is described, it cannot be overemphasized that this invention is not limited to this.
[0043]
(Example)
(Belt molding)
First, by appropriately reacting 62 parts by weight of ethylene glycol and 1140 parts by weight of ε-caprolactone in the presence of 30 ppm of catalyst (SnCl ₂ ), a poly-ε-caprolactone system having a caprolactone chain of 5 and a molecular weight Mn of 1200. Diol was obtained. 20 parts by weight of MDI (4,4′-diphenylmethane diisocyanate) was added to 100 parts by weight of this poly-ε-caprolactone-based diol, and reacted at 100 ° C. for 3 hours to obtain a millable urethane. Subsequently, 100 parts by weight of this millable urethane, 5 parts by weight of a peroxide crosslinking agent Park Mill D-40 (trade name; manufactured by NOF Corporation), 20 parts by weight of carbon black, 2 parts by weight of an anti-aging agent, and process oil 10 parts by weight were mixed and kneaded with an open roll.
[0044]
Next, the mold was covered with a stretchable woven fabric made of polyester, and a filamentary core made of No. 30 polyester yarn was wound on the mold in a spiral shape at a pitch of 0.8 mm. Subsequently, a rubber paste obtained by diluting and dissolving polyurethane used in the belt body in a solvent (for example, toluene, etc.) about 15 times was applied as a co-glue, dried, and then the above-described millable polyurethane was extruded. The rubber tube was covered with a thickness of 1.0 to 2.0 mm.
[0045]
Thereafter, a film was wound thereon and placed in a vulcanizing can and steam vulcanized to obtain an endless belt tube material. At this time, a Lumirror film (polyester film: trade name) was used as the film, and the film was wound and vulcanized so that a pressure of about 10 kg was applied. Thereby, the material of the belt body in which the core body made of the stretchable woven fabric is embedded is formed. The belt thickness was 1.5 mm.
[0046]
(Preparation of surface treatment solution)
80 parts by weight of ethyl acetate, 20 parts by weight of an isocyanate compound (MD1: manufactured by Dainippon Ink and Co., Ltd.), 4 parts by weight of acetylene black (manufactured by Denki Kagaku), 2 parts by weight of acrylic fluoropolymer (Modiper F600: manufactured by Nippon Oil & Fats) The surface treatment liquid was obtained by stirring for a minute.
[0047]
(surface treatment)
Before cutting off the material of the belt body, the material was inserted into a cylindrical iron core bar and the surface was washed with ethyl acetate.
[0048]
Thereafter, the surface treatment solution prepared as described above was applied and impregnated by brushing, and then heat-treated at 120 ° C. for 60 minutes.
[0049]
Then, it cut off and the conveyance belt was obtained. The belt width was about 10 mm, and the surface roughness of the polished surface was Rz = 10 μm.
[0050]
(Comparative Example 1)
(Belt molding)
A belt was prepared in the same manner as in Example except that nitrile rubber was used.
[0051]
(Adjustment of surface treatment liquid)
A solution of hydrochloric acid and bleaching powder was prepared.
[0052]
(surface treatment)
The material that had been polished was immersed in a hydrochloric acid-exposed powder treatment solution for 60 minutes, and then dried at 50 ° C. for 15 minutes. Then, it cut off and the conveyance belt was obtained.
[0053]
(Comparative Example 2)
A fluorine-based treatment liquid (manufactured by Shinko Giken: SAT700N) was applied to the material molded with nitrile rubber and polished, and dried overnight. Thereafter, it was cut off to obtain a conveyor belt.
[0054]
(Test Example 1)
With respect to the conveyance belts of Examples and Comparative Examples 1 and 2, the friction coefficient with respect to PPC paper was measured by the method shown in FIG.
[0055]
As shown in FIG. 1, a conveyor belt 10 is set on a fixed shaft 2 provided on a fixed base 1 and a movable shaft 4 provided on a movable base 3 provided slidably. And a metal support plate 5 for flatly supporting the conveyor belt 10 set between the movable shaft 4 and the movable shaft 4 is fitted. Then, a RPC # 6200 PPC paper 7 is wound around a 65 mm × 50 mm × 10 mm SUS plate 6 weighing 200 g, and when this is pulled horizontally through the load cell 8 at 20 to 50 mm / s, the load cell 8 The load Q (N) detected in step 1 was obtained, and the friction coefficient as an initial state was measured from the following equation.
[0056]
[Expression 1]
μ = Q (N) / (200 × 9.8)
[0057]
Further, after polishing 0.1 mm, 0.2 mm, and 0.3 mm in the thickness direction, the friction coefficient was similarly measured by the above formula.
[0058]
These results are shown in Table 1 and FIG.
[0059]
[Table 1]

[0060]
As a result of the above, the conveyor belt of the example had a small initial coefficient of friction, maintained a low level of 0.5 or less after 0.1 mm polishing, and was 1 or less after 0.2 mm polishing. Then, it was found that when the surface was polished by 0.1 mm, the surface treatment effect was completely lost.
[0061]
(Test Example 2)
The same belts as in the example were set as the driving belt 10A and the driven belt 10B in the belt tension change rate measuring device of FIG. The tension change rate measuring device has one drive roll 21 and a plurality of driven rolls 22, sets the drive belt 10A and the driven belt 10B with a predetermined tension, and drives the drive roll 21 at a belt speed of 1.5 m / sec. The vehicle travels for a predetermined time. Regarding the change in tension, the tensile tension at the belt length set in the initial stage and the tensile tension after running for a predetermined time were measured, and the change rate of the tension was obtained. The result shown in FIG. 4 was obtained.
[0062]
As a result, it was found that the tension holding rate of the conveying belt of this example was 75% or more even after the running time of 2000 hours.
[0063]
【The invention's effect】
As described above, according to the present invention, since at least the conveying surface of the belt body made of polyurethane has a surface treatment layer formed by impregnating a surface treatment liquid containing at least an isocyanate component, it is worn to some extent. In addition, a low friction coefficient can be maintained, and the desired coefficient of friction can be adjusted relatively easily by the composition of the surface treatment liquid.
[Brief description of the drawings]
FIG. 1 is a diagram showing a method of measuring a friction coefficient.
FIG. 2 is a diagram showing a result of measuring a friction coefficient.
FIG. 3 is a diagram showing a tension change rate measuring apparatus.
FIG. 4 is a diagram showing a result of measuring a rate of change in tension.
[Explanation of symbols]
1 fixed base 2 fixed shaft 3 movable base 4 movable shaft 5 metal support plate 6 SUS plate 7 PPC paper 8 load cell 10 conveying belt 10A driving belt 10B driven belt 21 driving roll 22 driven roll

Claims (10)

  In an endless belt for transporting a transported object, at least a transport surface of a belt body made of polyurethane has a surface treatment layer formed by impregnating a surface treatment liquid containing at least an isocyanate component, and an initial state and An endless belt for conveyance, characterized in that the coefficient of friction with respect to PPC paper on the surface after 30 μm wear is 1 or less.   The endless belt for conveyance 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.   The endless belt for conveyance according to claim 2, wherein the surface treatment liquid further comprises carbon black dispersed therein. The endless belt for conveyance according to any one of claims 1 to 3, wherein a coefficient of friction with respect to the PPC paper on the surface after 100 μm wear is 0.5 or less. In any one of claims 1-4, transporting endless belt and having a surface treatment layer on the opposite side to the conveying surface. 6. The conveyance endless belt according to claim 5 , wherein a difference between a friction coefficient of the conveyance surface and a friction coefficient of the opposite surface is 0.3 or more. In any one of claims 1-6, transporting endless belt wherein the belt body, wherein the core body is embedded. The endless belt for conveyance according to any one of claims 1 to 7 , wherein a tension retention after 100 hours is 60% or more in a state where the belt body is stretched by 10%. The endless belt for conveyance according to any one of claims 1 to 8 , wherein the rubber hardness of the belt main body is 50 to 90 ° according to JIS A. In any one of claims 1-9, transporting endless belt, wherein the surface roughness Rz of the conveying surface is 10μm or less.

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