KR20200043067A - Method for manufacturing pickup roller - Google Patents

Abstract

The present invention relates to a method for manufacturing a pickup roller which is applied to an automatic teller′s machine (ATM) or director type paper money counter, or imaging device (e.g. printer, copier, facsimile, etc.), and ensures wearing resistance and a high frictional coefficient even upon the long-term paper money counting or paper feeding operation. The method for manufacturing a pickup roller includes: carrying out pretreatment for incorporating at least one type of metal powder selected from aluminum and alloys thereof, copper and alloys thereof, and stainless steel and alloys thereof to EPDM to provide the pickup roller with wearing resistance and a high frictional coefficient; and mixing carbon black, a sulfur crosslinking agent, zinc oxide (ZnO), processing oil and a processing aid as fillers with the EPDM containing metal powder by the pretreatment, carrying out agitation, and molding the mixture of the metal powder-containing EPDM with the fillers by using a pickup roller molding device.

Description

Manufacturing method of pickup roller {METHOD FOR MANUFACTURING PICKUP ROLLER}

The present invention relates to a method of manufacturing a pickup roller, and more specifically, it is applied to an automated teller machine (ATM) or a stand-alone bill counter or image forming apparatus (eg, printer, copier, facsimile, etc.) for a long period of time. It relates to a method of manufacturing a pickup roller to ensure that the wear rate and high friction coefficient are ensured even during the paper money count or paper feeding operation.

As is well known, an ATM equipped with a bill counting function or a single bill counter is essentially configured with a pick-up roller (feeder roller) for continuously supplying bills one by one in order to count counts of bills continuously.

In addition, a printer as an image forming apparatus linked as a peripheral device of a computer is also provided with a pick-up roller (feeding roller) for feeding printing paper from the printing paper cartridge to each sheet, and a conveying roller for transferring the printing paper to the image forming section. At least one (Feeding Roller) is provided.

Further, even in the case of a fax for transmission or reception of a document or a scanner for input of a document (image), a pickup roller or a transport roller for feeding a document or printing paper to be transmitted is configured.

Typically, the pick-up roller (paper feed roller) is coated with a rubber film such as a rubber film or urethane on the surface of a metal or high-strength synthetic resin roller to increase the frictional force on a printing paper (or a document to be transferred). The elastic material layer of the (feeder roller) wears its surface as the amount of paper feed (or pickup) increases, and the paper feed performance (pickup performance) deteriorates.

In the case of a bill counting machine, if the pickup roller is worn or the pickup performance is deteriorated, accurate counting operation is impossible, and even in the case of an image forming apparatus, if the performance of the pickup roller (feeder roller) or the transfer roller is deteriorated, during the feeding operation of printing paper Skew occurs or malfunctions such as unfeed or multiple sheets are caused.

In consideration of such a point, in the Utility Model Registration No. 20-0263056 (January 21, 2002), a paper feed roll for a high-speed copier is disclosed, which is used instead of coating an elastic material on the surface of an aluminum roll. A ceramic coating layer is formed.

The ceramic coating layer is spray-coated with a fine powder of a material having high hardness such as ceramic or tungsten alloy, or the adhesive is coated on the back surface of the friction base provided with a wear-resistant powder ceramic coating layer, and the roll is protected with release paper It is formed by cutting the release paper after cutting by the circumference of the circumference and sticking it around the roll. will be.

However, in the case of such a paper feed roll for a high-speed copier, a treatment in which a powder such as ceramic must be thermally coated to form a ceramic coating layer on the surface of the roll, or a friction base formed with a ceramic coating layer on one side is cut by the circumferential length of the roll. And removing the release paper from the adhesive surface of the friction base and adhering the friction base to the roll, which makes the manufacturing process of the pick-up roll cumbersome as well as the roll-up during the pick-up of banknotes or copy paper. The possibility of separating the friction base cannot be ruled out.

On the other hand, in Utility Model Registration No. 20-0174898 (Registration Date: 01/04/2000), the paper contact surface is used to supply or discharge copying or printing paper from copiers, office equipment such as printers and fax machines, or various printing machines such as rotary machines. A paper feed and discharge roller that prevents the paper from slipping or jamming due to thermal deformation or abrasion on the surface of the paper feed and discharge roller by forming an abrasive layer that adheres powder particles (that is, abrasive grains) that can be powder-molded metal and non-metallic materials. It is disclosed.

According to the paper feeding / discharging roller, a metal or rubber or resin roller base material, and a high hardness non-metal powder or tungsten such as diamond, CBN, ceramic, etc., selected according to the use or required performance of the roller on the paper contact surface of the roller base material Consists of abrasive layer formed by fixing metal powders such as alloy, iron, aluminum, etc. by plating, matrix fusion, or adhesion method. As another method, a high elastic rubber band containing abrasive is made and inserted into the outer circumferential surface of the roller base material. The abrasive grains are formed by snowfall.

Here, in the above-mentioned paper feeding and dispensing roller, the abrasive layer containing abrasives is a matrix fusion method or a method of bonding to a roller base material by forming in the form of an adhesive method or abrasive-containing bands. In the case of forming the abrasive layer by the adhesion method, the possibility of peeling from the corresponding roller in the form of dust increases during actual use, and the abrasive is applied to rubber or synthetic resin to form the abrasive-containing band and inserted into the surface of the roller In the case of installation, first, the process of forming the abrasive-containing band and applying the abrasive-containing band to the surface of the roller is required, which increases the overall working process, which is disadvantageous.

Therefore, the present invention has been made in view of the above-mentioned circumstances of the prior art, and aluminum or its alloy as a non-magnetic metal powder, copper or its alloy, stainless steel or its alloy as EPDM (Ethylene Propylene Diene Monomer) as a main material; An object of the present invention is to provide a method of manufacturing a pickup roller having a wear resistance and high friction coefficient by preparing a roller forming material mixed with EPDM) to form a pickup roller.

In order to achieve the above object, according to a preferred embodiment of the present invention, in the method of manufacturing a pickup roller for paper money counting or paper feed, including EPDM (Ethylene Propylene Diene Monomer) and a filler as a polymer, the inside of the pickup roller Pre-treatment for incorporating the metal powder for wear rate and high friction coefficient into the EPDM is performed, and the EPDM containing the metal powder is carbon black, sulfur crosslinking agent, zinc oxide (ZnO), process oil and A method of manufacturing a pickup roller for mixing and stirring the processing aid and forming the mixture of the stirred EPDM and the filler by a pickup roller molding apparatus is provided.

According to the present invention, preferably, the metal powder is a non-magnetic metal powder, and the non-magnetic metal powder includes any one or a plurality of metal powders selected from aluminum or its alloy, copper or its alloy, stainless steel or its alloy. It is assumed.

According to an embodiment of the present invention, the pre-treatment is a method of minimizing the dimension to 100 to 200 μm by supplying a milling solution to a metal powder having a size larger than 300 to 400 μm and milling the metal powder having a dimension of 100 to 200 μm. Any of the ways to be incorporated in the production of EPDM is envisioned.

According to the preferred embodiment of the present invention described above, a pick-up roller (or paper feed) applied to supplying paper sheet by sheet from a copy machine or printer as an image forming apparatus to which a function of supplying a sheet of paper is applied or a printing or copying function is applied. By forming a metal powder, preferably a non-magnetic metal powder, on a roller) to improve the wear resistance and friction coefficient, skew is generated in the counting or feeding operation of bills compared to the case made of conventional rubber materials or urethane resins. This is suppressed as much as possible.

Hereinafter, preferred embodiments of the present invention will be described in detail.

According to a preferred embodiment of the present invention, first, as a metal powder, preferably a non-magnetic metal powder, for example, aluminum or its alloy, copper or its alloy, stainless steel or any one or a plurality of metal powders selected from the alloy The pre-treatment for minimization and liquefaction of the dimensions is performed.

According to the pre-treatment process, for example, a metal powder having a size of 300 to 400 µm or more is put into a pre-treatment solution (typically, paraffin oil), for example, 100 to 200 µm, for example, by a milling device (polishing device) for dimensional adjustment. Minimum dimension processing is performed by dimensions.

As the pretreatment process is performed, the effect of corrosion of the metal powder, such as corrosion by acid or salt, is minimized, so that damage to the polymer during mixing with EPDM (Ethylene Propylene Diene Monomer) as a polymer is minimized. do.

In order to minimize the dimensions, a metal powder liquid in a liquid form in which the size is minimized and neutralized by applying a pre-treatment solution (paraffin oil) is mixed with the melted EPDM for forming the pickup roller and stirred. , The metal powder mixed in the EPDM is assumed to be in the range of 0.6 to 0.9 parts by weight relative to 100 parts by weight of the EPDM solution, thereby forming a roller forming material, and the application range of the metal powder contained in the roller forming material It is possible to vary within a range that does not affect the molding of the pickup roller by EPDM.

On the other hand, according to the present invention, as another example of the pre-treatment process described above, the metal powder for the production of the pick-up roller may be contained by mixing the minimized metal powder in the production process of EPDM.

That is, according to an example of the manufacturing process of EPDM. For example, by using butyl aluminum and vanadium tetrachloride as catalysts in a heptane solution, ethylene and propylene are reacted at -50 ° C to obtain a rubbery polymer, and a third such as dicyclopentadiene is used for the polymer. Formation of a pickup roller by mixing, for example, a metal powder having a size of 100 to 200 µm in the manufacturing process of the EPDM, by adding a component to form a terpolymer (three-component polymer material) containing a lot of double bonds by three-way hybrid polymerization. It is possible to obtain EPDM containing a metal powder for.

As described above, after obtaining the roller forming material for forming the pickup roller by the pre-treatment process in the state where the metal powder is mixed with the EPDM, carbon black and sulfur crosslinking agents are mixed as a filler.

In that case, carbon black as the filler is mixed in the range of 0.5 to 1.5 wt% and 4 to 6 wt% of the sulfur crosslinker with respect to 100 wt% of EPDM containing the metal powder.

In addition, according to the present invention, zinc oxide (ZnO) is used as a metal oxide to control the molding time of the polymer (ie, EPDM) (to promote vulcanization) and to improve the properties of heat resistance, heat shrinkage, friction resistance, ultraviolet light, and workability. As this is added, the zinc oxide is set at 3 to 5 wt%.

In addition, in addition to the zinc oxide, process oil is used to improve the smooth dispersion and processability of all materials including the polymer (EPDM), improve the elasticity and refraction properties of vulcanized rubber, and improve tensile strength and wear resistance. As also added, the process oil is assumed to be in the range of 40-46 wt%.

As described above, when the carbon black and sulfur crosslinking agent, zinc oxide, and process oil as the filler are mixed in the EPDM containing the metal powder, a molding apparatus for manufacturing a pickup roller by adding a known processing aid in an appropriate amount as necessary ( That is, it is put into a mold) and molded over a time period of approximately 5 minutes at a temperature condition of approximately 170 ° C to form a pickup roller (feeder roller).

Therefore, the pickup roller according to the present invention formed by the above process is molded and manufactured in a state in which the metal powder is mixed with EPDM, thereby improving the wear resistance and friction coefficient by the metal powder, as well as by conventional adhesion or coating. In contrast to the case where the high hardness ceramic or metal powder is formed only on the roller surface, disadvantages such as exfoliation of the high hardness ceramic powder or metal powder in the form of dust can be excluded.

For reference, the pickup roller according to the present invention made of EPDM to which the metal powder is added by the above-described process and the durability of the pickup roller made of EPDM not containing only the metal powder among the above-mentioned filler-containing conditions as a comparison target thereof The properties (wear rate and friction coefficient, contamination) were evaluated as follows to confirm the results.

First, for the wear rate of the pickup roller of the present invention and the comparison target pickup roller, 'QC 619K Taber wear tester' of 'COMTECH TESTING MACHINES Co.Ltd' was used as a wear rate measurement jig, and the evaluation test standard was 'KS M 6625'. By applying and evaluating using simulated paper, the results were confirmed as shown in Table 1 and Table 2 below.

    division   Initial weight (g)   Final weight (g)    Wear amount (g)    Wear rate (%)   Comparison object 1   1.1080    1.0984    0.0096 0.87   Comparison object 2   1.0738    1.0592    0.0146     1.36    Average   1.0909    1.0788    0.0121     1.11

    division   Initial weight (g)   Final weight (g)    Wear amount (g)   Wear rate (%)  Invention 1   1.1015   1.0952    0.0063    0.57  Invention 2   1.1076   1.0983    0.0093    0.84    Average   1.1046   1.0968    0.0078 0.71

From the above evaluation results, the wear rate of the pickup roller made of EPDM containing metal powder according to the present invention of 'Table 1' is smaller than that of the comparison pickup roller without metal powder of 'Table 2'. can confirm.

Next, the friction coefficient for the pick-up roller according to the present invention and the pick-up roller to be compared is a friction coefficient measurement jig, an evaluation test standard using imitation waste paper by the 'FCMS170 friction coefficient meter' of 'I-neoplus' It was evaluated based on 'ASTM D 1894'. As a result, it was confirmed that the pickup roller according to the present invention was 1.35 to 1.37, while the pickup roller for comparison was 1.2.

And, the contamination between the pickup roller according to the present invention and the pickup roller to be compared was observed with the naked eye after measuring the above-described wear rate and wear coefficient, and no contamination was observed.

From the above evaluation results, it can be seen that the pickup roller manufactured by EPDM containing the metal powder according to the present invention has a wear resistance and high friction coefficient.

On the other hand, the present invention is not limited to the above-described embodiments, and various changes and modifications can be made within the scope of not departing from the technical gist and the point of the invention.

In the above, the dimensions of the metal powder are assumed to be 100 to 200 μm, but may be applied to the following dimensions if necessary in the manufacturing process of the pickup roller, and the mixing ratio of each filler described above may also be Of course, it is possible to add or subtract within a range that does not affect physical properties.

Claims (3)

In the method of manufacturing a pickup roller for paper money counting or paper feed, including EPDM (Ethylene Propylene Diene Monomer) and filler as a polymer,
Pre-treatment for incorporating the metal powder for wear resistance and high friction coefficient of the pickup roller into the EPDM is performed,
The EPDM containing the metal powder by the pretreatment is mixed with carbon black, a sulfur crosslinking agent, zinc oxide (ZnO), process oil, and stirred as the filler.
A method of manufacturing a pickup roller, characterized in that a mixture of the stirred metal powder-containing EPDM and a filler is formed by a pickup roller forming apparatus. The method of claim 1, wherein the metal powder includes a non-magnetic metal powder,
The non-magnetic metal powder is a method of manufacturing a pickup roller, characterized in that any one or a plurality of metal powder selected from aluminum or its alloy, copper or its alloy, stainless steel or its alloy. The method of claim 1, wherein the pre-treatment is a method of minimizing the dimension to 100 to 200 µm by supplying a pre-treatment solution to a metal powder having a size larger than 300 to 400 µm and milling (polishing).
Method of manufacturing a pickup roller, characterized in that any one of the method of mixing the metal powder of the 100 ~ 200㎛ dimension in the production of the EPDM.