JP3441041B2 - Paper sheet transport / stacking member - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic ticket gate, a cash dispenser, a money changer, an automatic ticket issuing machine, and the like, which are used for transporting and accumulating paper sheets such as banknotes, magnetic cards and tickets. The present invention relates to a member for transport and collection.

[0002]

2. Description of the Related Art Conventionally, in an automatic ticket gate, a cash dispenser, a money changer, an automatic ticket issuing machine, etc., during the transportation process of bills, magnetic cards, tickets, etc., such paper sheets are transported and aligned. Impeller-shaped rubber member (hereinafter,
A member for transporting and accumulating paper sheets) is used. This paper sheet conveying and accumulating member has a cylindrical portion 0 as shown in FIG.
1 has a structure in which a plurality of thin plate-shaped blades 02 are embedded in the outer periphery of the blade 1. Usually, the blades 02 are formed of a rubber member having a core body 02a at the center in the thickness direction.

[0003]

Since the above-mentioned paper sheet conveying and accumulating member conveys and accumulates the paper sheets by hitting the blades 02 on the paper sheets while being rotated at a high speed, Abrasion resistance of the blade 02 is required. Further, since the blade 02 can be struck on the paper sheet at high speed, the blade 02
There is a problem that the base end part of is easily torn.

Therefore, the present invention has been made in view of such circumstances.
It is an object of the present invention to provide a paper sheet conveying and accumulating member capable of substantially eliminating the abrasion of the surface of the blade portion and stably conveying and accumulating the paper sheets for a long period of time.

[0005]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems provides a paper having a cylindrical cylindrical portion and a plurality of blade portions which are integrally provided on the outer peripheral surface of the cylindrical portion and extend radially. A member for accumulating and transporting leaves, which is obtained by reacting a polyol containing a poly-ε-caprolactone diol represented by the following formula (I) with a polyisocyanate, and has an average caprolactone chain in the poly-ε-caprolactone diol. The value is controlled within a predetermined range, the molecular weight distribution Mw / Mn of the caprolactone chain portion of the poly-ε-caprolactone diol is 1.5 or less, the isocyanate unit containing the urethane bond and R in the formula (I) below. A kneading-type polyurethane having a rubber-like elasticity in which the crystallinity of the caprolactone chain is limited by the influence of In the paper sheet conveying integrated member, characterized in that by crosslinking molding using.

[0006]

[Chemical 2] (Here, [] indicates a caprolactone chain portion, and m
And n represents the number of chains, R is a polymerization initiator R (OH)
Derived from ₂ )

Here, the polyisocyanate is, for example, 2,6-toluene diisocyanate (TDI),
4,4'-diphenylmethane diisocyanate (MD
I), paraphenylene diisocyanate (PPDI),
It is at least one selected from 1,5-naphthalene diisocyanate (NDI) and 3,3-dimethyldiphenyl-4,4′-diisocyanate (TODI).

The content of the poly-ε-caprolactone diol in the total polyol is preferably 30% by weight or more.

The poly-ε-caprolactone diol is formed by using ε-caprolactone monomer and a polymerization initiator composed of a compound having active hydrogen containing R. It is in kneading type polyurethane.

The polyol contains, for example, a chain extender in addition to the long chain diol containing the poly-ε-caprolactone type diol.

The polymerization initiator R (OH) ₂ of R of the poly-ε-caprolactone diol is, for example,
The molecular weight is 500 or less.

The molecular weight of the poly-ε-caprolactone type diol is, for example, 800-1500.

The poly (ε-caprolactone diol) polymerization initiator R (OH) ₂ is, for example, a linear glycol having 2 to 12 carbon atoms; neopentyl glycol,
Carbon number 1 such as 3-methyl-1,5-pentanediol
At least one selected from the group consisting of diols having a side chain of 2 or less; and diols having an unsaturated group of 12 or less carbon atoms such as 3-allyloxy-1,2-propanediol, and the caprolactone chain. Is controlled in the range of 3 to 6.

The polymerization initiator R (OH) ₂ for the poly-ε-caprolactone diol is, for example, 1,4-
At least one selected from the group consisting of diols having 12 or less carbon atoms containing an aromatic ring such as bis (hydroxyethoxy) benzene and paraxylene glycol, and cycloaliphatic diols such as cyclohexanediol and cyclohexanedimethanol. The average value of the caprolactone chain is controlled in the range of 4-8.

The poly (ε-caprolactone diol) polymerization initiator R (OH) ₂ includes, for example, one having a molecular weight distribution.

The poly-ε-caprolactone diol polymerization initiator R (OH) ₂ is formed from at least one selected from the group consisting of polycarbonate diol, polyester diol, and polytetraoxyethylene diol. Is.

The glass transition temperature Tg of the kneading type polyurethane is preferably -20 ° C or lower.

The kneading type polyurethane used in the present invention is
It can be obtained by reacting a polyol and a polyisocyanate.

Here, the polyol used in the present invention uses poly-ε-caprolactone type diol as a main component. Here, the poly-ε-caprolactone diol is obtained by ring-opening polymerization of ε-caprolactone in the presence of a polymerization initiator having active hydrogen, and can be represented by the above formula (I). In the present invention, among them, the average value of the caprolactone chain (the average value of m and n below) is within a predetermined range, and the molecular weight distribution Mw / Mn of the caprolactone chain portion is 1.5 or less, which is extremely limited. Of is used.

As described above, the average of the caprolactone chains of the poly-ε-caprolactone diol used in the present invention is within a predetermined range, for example, 3 to 6 or 3 to 8 is composed of a caprolactone chain portion and a polyurethane bond. In the kneading type polyurethane of the present invention, in a normal state where no strong stress is applied, the caprolactone chain portion, which is originally strong in crystallinity, is in an amorphous state due to the influence of the isocyanate unit constituting the urethane bond and R in the above formula. As a whole, it exhibits elasticity by maintaining an amorphous state, but in an abnormal state in which it is fractured by a force such as pulling, the reversible state in which the caprolactone chain part shows the original oriented crystallinity and contributes to the strength. To maintain. Further, setting the molecular weight distribution Mw / Mn of the caprolactone chain portion to 1.5 or less is intended to limit the amount of caprolactone chains that deviate from the predetermined range to the larger side. That is, although the caprolactone chain varies depending on R, for example, when it is larger than 6 or 8, it tends to crystallize in a stressed state, particularly in a state stored at low temperature, and when crystallization starts in this part, This is because the portion of the caprolactone chain having, for example, 3 to 6 or 3 to 8 is easily crystallized. This low temperature crystallization has serious defects in functions such as viscoelasticity and high friction coefficient as an elastomer, and has a drawback that use environment and storage environment are significantly limited. On the other hand, when the caprolactone chain is small, the crystallinity is too small to form the above reversible state. The range in which this reversible state cannot be formed depends on the type of R in the above formula, and when R is derived from, for example, an aliphatic diol, it is not preferable that the number of chains is 2 or less, and R is, for example, an aromatic ring or the like. When it is derived from the contained diols, a chain of 3 or less is not preferable, but when R is derived from a polymer, either 2 or 1 may be a chain.

In the present invention, by using the specific kneading type polyurethane as described above, the abrasion of the surface of the blade portion is almost eliminated, and the tearing at the base end portion of the blade portion is also prevented. It is possible to provide a member for transporting and accumulating paper sheets that can stably perform the transport and accumulation of the above for a long period of time.

In the present invention, the polymerization initiator that forms the poly-ε-caprolactone diol, that is, the compound that constitutes the above-mentioned R, has active hydrogen and forms the diol after ring-opening polymerization. There is no particular limitation as long as it is a diol or diamine. However, in order to exert the effect of the present invention remarkably, it is preferable to use a polymerization initiator having no molecular weight distribution, that is, a short chain initiator. The poly-ε-caprolactone-based diol formed by using such a short chain initiator is, for example, R
Can have a molecular weight of 500 or less. Alternatively, it can be defined as a poly-ε-caprolactone diol having a molecular weight of 800 to 1500 as a whole.

Further, such an initiator affects the crystallinity of the caprolactone chain portion as described above. Therefore, when R is, for example, a straight-chain hydrocarbon, it is necessary to control the average value of the above-mentioned caprolactone chain to 3 to 6, but R is large in steric hindrance such as an aromatic ring or an aliphatic ring. When it is derived from an initiator and has a large influence on the crystallinity of the caprolactone chain portion, the average value of the caprolactone chain may be controlled to 4-8. That is, in the present invention, the average value of the caprolactone chain is appropriately controlled to a predetermined value according to the type of the polymerization initiator.

Examples of short chain initiators that can be used in the present invention are ethylene glycol, thiodiethanol,
Propylene glycol, butylene glycol, and other straight-chain glycols having 2 to 12 main chain elements; neopentyl glycol, 3-methyl-1,5 pentanediol, and other diols having a side chain of 12 or less carbon atoms; 3- Diols having an unsaturated group having 12 or less carbon atoms such as allyloxy-1,2-propanediol; and 12 or less carbon atoms containing an aromatic ring such as 1,4-bis (hydroxyethoxy) benzene and paraxylene glycol. And alicyclic diols such as cyclohexanediol and cyclohexanedimethanol.
Of course, two or more kinds of these short chain initiators may be mixed and used.

The effect of the present invention can be exhibited even when the polymerization initiator has a molecular weight distribution to some extent, that is, a long chain initiator is used. Examples of such long chain initiators include 1,
Examples thereof include polycarbonate diols such as 6-hexane carbonate diol; Porie ester diols such as polytetramethylene glycol ether (PTMG); and polyester diols such as butylene adipate diol.

In order to form the poly-ε-caprolactone diol used in the present invention, it is preferable to use a catalyst in addition to ε-caprolactone and a polymerization initiator. As such a catalyst, it is preferable to use a metal compound catalyst containing halogen or an organic acid group, and examples thereof include stannous halides such as chlorine, bromine and iodine.

In the present invention, as the main component of the polyol,
The above-mentioned specific poly-ε-caprolactone-based diol, which is a long-chain polyol, is used, but in addition to this, generally used long-chain polyols and chain extenders can be used. As the generally used long-chain polyol, either a polyester-based polyol or a polyether-based polyol may be used, and a blend-copolymerized or partially modified one thereof may be used. Further, as the chain extender, for example, ethylene glycol,
A straight chain glycol having 2 to 12 main chain elements such as thiodiethanol, propylene glycol and butylene glycol; a diol having a side chain of 12 or less carbon atoms such as neopentyl glycol and 3-methyl-1,5-pentanediol. And diols having an unsaturated group having 12 or less carbon atoms such as 3-allyloxy-1,2-propanediol; and aromatic rings such as 1,4-bis (hydroxyethoxy) benzene and paraxylene glycol Examples thereof include diols having 12 or less carbon atoms and hydrogenated products thereof, and additionally, triols such as trimethylol, stearyl alcohol, hydroxyethyl acrylate and the like can be additionally used. In addition, in order to exert the effect of the present invention remarkably, it is preferable that the above-mentioned specific poly-ε-caprolactone diol is contained as a main component.

As the polyisocyanate for reacting with such a polyol to form the polyurethane of the present invention, 2,6-toluene diisocyanate (TD) is used.
I), 4,4'-diphenylmethane diisocyanate (MDI), paraphenylene diisocyanate (PPD
I), 1,5-naphthalene diisocyanate (ND
I), 3,3-dimethyldiphenyl-4,4'-diisocyanate (TODI) and the like can be mentioned. Especially 4,4'-diphenylmethane diisocyanate (MD
It is preferable to use a polyisocyanate containing I) because it is known to act as a crosslinking point of peroxide crosslinking.

The mixing ratio of the polyol and the polyisocyanate may be a general one. For example, the active hydrogen such as the hydroxyl group of the diol and the isocyanate group are mixed so as to be almost equimolar. For example, OHV (hydroxyl value: KH
Omg / g) 112, 25 parts by weight of MDI per 100 parts by weight of diol, and OHV94, 20.8 parts by weight of MDI per 100 parts by weight of diol, OHV
In case of 75, 1 MDI is added to 100 parts by weight of diol.
6.7 parts by weight.

The paper sheet conveying and accumulating member of the present invention can be obtained by kneading the above-mentioned kneading type polyurethane with a curing agent, thermosetting (crosslinking) and molding. Examples of such a curing agent include organic peroxides for general synthetic rubbers, sulfur, organic sulfur-containing compounds, and isocyanates. Here, an organic peroxide is generally used, and examples of the organic peroxide include dicumyl peroxide, α,
Examples include α′-bis (t-butylperoxyisopropyl) benzene and the like. The amount of the organic peroxide compounded is 0.5 to 10 parts by weight, preferably about 1.5 to 5 parts by weight, based on 100 parts by weight of the total of the polyol and the isocyanate. Further, sulfur, it is possible to use an organic sulfur-containing compound as a curing agent, when the above-mentioned polymerization initiator or chain extender has an unsaturated bond,
For example, it is the case of 3-allyloxy-1,2-propanediol. Here, as the organic sulfur-containing compound, T
MTD (Tetramethylthiuram disulfide), TET
D (Tetraethylthiuram disulfide), DPTT
Examples thereof include thiuram-based vulcanization accelerators such as (dipentamethylene thiuram tetrasulfide) and 4,4′-dithiomorpholine.

When kneading and curing in this way,
Commonly used additives, that is, carbon black, reinforcing agents such as silica, anti-sticking agents such as wax,
A plasticizer such as dioctyl phthalate (DOP) is used.

In the polyurethane of the present invention, a hydrolysis inhibitor such as polycarbodiimide may be used in an amount of about 0.2 to 3% by weight based on 100 parts by weight of the polyurethane as usual. The hydrolysis resistance of the polyurethane member of the present invention is about twice as high as that of the conventional thermosetting kneading type polyurethane. Therefore, when a hydrolysis inhibitor is used in the same manner as in the conventional case, the hydrolysis resistance is correspondingly increased. However, in order to obtain the same level of hydrolyzability as in the conventional case, the amount of addition can be reduced to about half. Since hydrolysis inhibitors are generally expensive, they can greatly contribute to cost reduction.

The reaction conditions of the kneading type polyurethane are generally 70 ° C. to 150 ° C. for 10 to 120 minutes, and then generally aged at 60 ° C. to 120 ° C. for about 6 to 48 hours. To do. Further, the heat curing condition is determined by the decomposition characteristics of the organic peroxide used when an organic peroxide is used as a curing agent, but it is usually 150 to 180 ° C.
It is preferable to set the condition for 60 minutes.

Further, the paper sheet conveying and accumulating member of the present invention is
For example, it is formed by electrothermal press molding. The press conditions for this press molding are a rubber mold temperature of 170 ° C. and a pressure of 200 kg.
/ Cm ² , and the time is about 10 minutes.

The paper sheet conveying and accumulating member of the present invention has a rubber hardness of 40 to 90 according to JIS A, particularly 60 in order to perform favorable conveying and accumulating and to prevent the blades from being torn.
-80 is preferable.

The shape of the blade is not particularly limited, and may be a thin plate shape, a rod shape, or the like, and the cross-sectional shape may be rectangular, circular, elliptical, or a combination thereof. Further, in order to make the blade portion more difficult to be torn off, the periphery of the blade portion may be R-shaped, and further, the base end portion of the blade portion may be
The boundary between the base end portion of the blade portion and the cylindrical portion may be formed into an R shape by increasing the thickness toward the cylindrical portion.

[0037]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below.

[Embodiment] A specific embodiment will be described below, but it goes without saying that the present invention is not limited to this.

First, 62 parts by weight of ethylene glycol,
1140 parts by weight of ε-caprolactone was used as a catalyst (SnC
1 ₂ ) By appropriately reacting in the presence of 30 ppm, a poly-ε-caprolactone diol having a caprolactone chain of 5 and a molecular weight Mn of 1200 was obtained. This poly-ε
-MDI to 100 parts by weight of caprolactone diol
(4,4'-diphenylmethane diisocyanate) 20
A part by weight was added, and the mixture was reacted at 100 ° C. for 6 hours to obtain a millable urethane.

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

Then, the above kneading type polyurethane was subjected to electrothermal press vulcanization molding to obtain a paper sheet conveying and accumulating member (Hs73).

As shown in FIG. 1, this member for carrying and accumulating is integrally formed with a blade portion 2 radially on the outer periphery of a cylindrical portion 1. Here, the cylindrical portion 1 has an inner diameter of 5 to 12 m.
m, the outer shape is about 7 to 30 mm, the length of the blade portion 2 is about 10 to 100 mm, the width (dimension in the rotation axis direction) is about 1 to 3 mm, and the thickness is about 0.7 to 1 mm. .

Using such a paper sheet conveying and accumulating member having a blade portion 2 having a length of 80 mm, a width of 3 mm and a thickness of 1 mm, the blade portion is rotated at 1600 mm / sec (900 rpm) and the blade portion is rotated. 2 was struck on an iron plate, and the breakage rate of the blade portion 2 was measured. For the purpose of the acceleration test, a test was conducted by scratching the end surface in the width direction near the base end of the blade 2 with a depth of 0.1 mm. These results are compared with various comparative products (Comparative Example 1: EPT
(Hs70); Comparative Example 2: Injected urethane (Hs75);
Comparative Example 3: Comparison with adipic ester type millable urethane (Hs72) revealed that, as shown in FIG.
It was confirmed that the service life of the paper sheet conveying and accumulating member of this example was remarkably excellent.

Further, in order to test the abrasion resistance, the paper sheet conveying and accumulating member of the present embodiment was rotated at 2100 rpm and the blade portion was struck on the iron plate, and the weight change rate of the blade portion after 500 hours was measured. However, it was 0.5%, and it was confirmed that the wear resistance was very good.

The embodiment described above does not limit the present invention, and the composition of the kneading type polyurethane and the shape of the blade are not particularly limited.

[0046]

As described above, since the member for accumulating and conveying paper sheets of the present invention is integrally formed of a specific polyurethane material, it has good wear resistance and has a blade base end portion. Since there is no tearing, the sheets can be conveyed and accumulated very stably over a long period of time.

[Brief description of drawings]

FIG. 1 is a schematic view showing a schematic configuration of a paper sheet conveying and accumulating member according to an embodiment of the present invention.

FIG. 2 is a diagram showing a result of a test example of a paper sheet conveying and accumulating member according to an embodiment of the present invention and a comparative product.

FIG. 3 is a schematic view conceptually showing an example of a conventional sheet conveying and accumulating member.

[Explanation of symbols]

1 cylindrical part 2 wings

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP 10-72516 (JP, A) JP 9-208656 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C08G 18/00-18/87 B65H 29/20-29/22

Claims (5)

(57) [Claims] 1. A paper sheet conveying and accumulating member having a cylindrical cylindrical portion and a plurality of blade portions that are integrally provided on an outer peripheral surface of the cylindrical portion and extend in a radial direction. ) Obtained by the reaction of a polyol containing a poly-ε-caprolactone diol and a polyisocyanate, the average value of the caprolactone chain in the poly-ε-caprolactone diol is controlled within a predetermined range, and the poly-ε -The molecular weight distribution Mw / Mn of the caprolactone chain portion of the caprolactone diol is 1.5.
The following is a kneading-type polyurethane in which the crystallinity of the caprolactone chain is limited and has rubber-like elasticity due to the influence of the isocyanate unit containing the urethane bond and R in the following formula (I) is cross-linked using a curing agent. A member for transporting and accumulating paper sheets, which is characterized in that [Chemical 1] (Here, [] indicates a caprolactone chain portion, and m
And n represents the number of chains, R is a polymerization initiator R (OH)
Derived from ₂ ) 2. The member according to claim 1, wherein the curing agent is at least one selected from organic peroxides, sulfur, organic nitrogen-containing compounds and isocyanate compounds. 3. The paper sheet conveying and accumulating member according to claim 1, wherein the rubber hardness is 40 to 90 according to JIS A. 4. The paper according to claim 1, wherein the blade portion is a thin plate or a rod, and the cross-sectional shape thereof is rectangular, circular, elliptical, or a combination thereof. A member for transporting and accumulating leaves. 5. The paper sheet conveying and accumulating member according to claim 1, wherein the base end portion of the blade portion is thicker toward the cylindrical portion.