TW555638B - Rubber roll and making method thereof - Google Patents

Abstract

This invention is to provide a rubber roller having a high adhesive force of a shaft core to a foamed rubber layer and excellent uniformity of an outer diameter and an excellent electric resistance value. A rubber composition 19 containing a foaming agent is filled in a cylinder 9 of a crosshead extruder 7. The composition 19 is advanced forward by a rotation of a screw 11, and arrived at a head 13. The composition 19 is changed in its advancing direction downward at the head 13, and extruded from a mouthpiece 15 as a tube 21. Meanwhile, the shaft core 3 is inserted from an insertion port 23 of an inner cylinder 17. The core 3 is passed through the cylinder 17, discharged from the mouthpiece 15, and advanced downward. An outer peripheral surface of the core 3 is covered with the tube 21. A suction is conducted from the port 23, and a space between the core 3 and the tube 21 becomes a negative pressure state.

Description

555638 7363pif.doc / 0〇8 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs V. Description of the Invention (I) Field of the Invention The present invention relates to, for example, photocopiers, laser printers, facsimile machines and automatic withdrawals. Rubber rollers used in machines and the like, particularly rubber rollers having a foamed rubber layer. Background of the branch technique In office machines such as photocopiers, rubber rollers such as a charging roller, a developing roller, a copy roller, a paper feed roller, a transport roller, and a fixed roller are used. When this office machine forms an image, first, an electrostatic latent image holder such as a photosensitive drum is uniformly charged with a charging roller. Next, the image is exposed so that an electrostatic latent image is formed on the electrostatic latent image holder. Next, toner is supplied onto the electrostatic latent image holder by a developing roller to form a toned image. Then, the printed object such as paper is conveyed to the electrostatic latent image holding body by a paper feed roller and a conveying roller, and the toned image is copied to the printed object by the copy roller. The toned image is then fixed to the object to be printed by a fixed roller. The charged roller, the developing roller, and the copy roller are in contact with the electrostatic latent image holder, and must have a certain degree of softness in order to obtain a proper gradual curvature with the electrostatic latent image holder. Further, from the viewpoint of improving the conveying capacity of the printed body, the paper feed roller and the conveying roller must also have a certain degree of flexibility. In particular, in recent years, the demand for high-precision and high-density images has been increasing, and more flexible rubber rollers are desired. For the purpose of imparting flexibility to rubber rollers, foamed rubber is used (see, for example, Japanese Patent Application Laid-Open No. 11-201140). 4 --- (Please read the notes on the back before filling this page) -J. Order:

This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 555638 A7 B7 7363pif.doc / 008 V. Description of the invention ο) The manufacturing method of a rubber roller with a foamed rubber layer, first of all The rubber composition of the foaming agent is extruded and formed into a tube, and then the tube is inserted into a dummy core and put into a vulcanization tank, and the foaming agent is foamed while heating to bridge the rubber to obtain a foamed rubber molded body . Next, this foamed rubber molded body is pulled out from the dummy core and inserted into the shaft core (the core as a part of the final product), and the surface of the foamed rubber molded body is honed to obtain a shaft core and a foamed rubber layer. Composed of rubber rollers. The purpose of honing is to flatten the surface of the foamed rubber and adjust the thickness of the surface. The purpose of using a dummy core is because the diameter of the tubular body will increase when the bridge is described later, so the diameter of the shaft core used is larger than the diameter of the dummy core. Bridging and foaming with a vulcanization tank will expand the outer diameter of the tube. Due to the gap between the tube and the dummy core, the inner pressure of the vulcanization tank will also increase the inner diameter of the tube. At this time, the amount of expansion of the inner diameter varies from site to site, and the inner diameter of the obtained foamed rubber molded body also becomes uneven. If the inner diameter is not uniform, an air layer is formed in the portion between the shaft core and the foamed rubber layer, and the adhesion between the shaft core and the foamed rubber layer becomes insufficient. Also, the air layer makes the resistance of the rubber roller uneven. Furthermore, this air layer will heat up and expand during honing. Even if the foamed rubber layer is smoothed in the expanded state, since the air layer returns to its original volume at normal temperature, the foamed rubber layer above this air layer will The depressions and irregularities on the surface of the foamed rubber layer will promote the unevenness of the electric resistance. 5 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ------------- ^ ^^ Packing --- (Please read the precautions on the back before filling (This page) Printed by the Consumers ’Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs A7 555638 7363pif.doc / 008 Description of the Invention (i) Japanese Unexamined Patent Publication No. 10-90975 discloses a crosshead extruder A manufacturing method of extruding a rubber composition on a support shaft and vulcanizing the rubber composition. The clearance between the support shaft and the rubber composition after being extruded using a cross-head extruder is small. However, if the horizontal head is pushed out normally, the support shaft and the rubber composition cannot be tightly adhered, because an air layer is still formed between the two, and the adhesion between the remaining support shaft and the rubber layer is insufficient, or the outer diameter of the rubber roller and The problem of uneven resistance. The problem of inadequate follow-up force and the problem of heterogeneity, such as in JP 7-238923, JP 7-295331, and JP 10-156917, have also revealed the so-called co-staking method. The invention of a rubber roller in which a solid rubber layer is provided on a foamed rubber layer is described in view of the above-mentioned problems. The object of the present invention is to provide a rubber roller, in which the shaft core of the rubber roller and the foamed rubber layer are bonded. High force and excellent uniformity of outer diameter and resistance. In order to achieve the above-mentioned object of the present invention, the present invention provides a method for manufacturing a rubber roller. The manufacturing method includes the following steps: a tubular object formed by an unbridged rubber composition containing a foaming agent is applied to the shaft in a tight state. A coating step of the surface of the core; and heating the tube to make the rubber 6 paper sizes use the Chinese National Standard (CNS) A4 specification (210 X 297 mm) " " --------- 7 ------ (Please read the notes on the back before filling this page) Order ·

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 555638 A7 B7 7363pif.doc / 008 V. Description of the invention (α) The bridging step of foaming agent while bridging. (Please read the precautions on the back before filling in this page.) This manufacturing method does not expand the inner diameter of the tubular during the bridging step because the tubular is in close contact with the shaft core during the coating step. Therefore, no air layer is formed between the shaft core and the foam rubber layer. The rubber roller obtained by this manufacturing method has a high adhesion force between the shaft core and the foamed rubber layer, and does not cause unevenness in resistance 値 caused by the air layer. Furthermore, this rubber roller does not cause uneven outer diameter due to the expansion of the air layer during honing. In addition, the meaning of "the tubular object and the shaft core are in close contact" in this manufacturing method means that there is substantially no intervening air layer (including air bubbles) or other foreign matter between the two. In this manufacturing method, the shaft core used in the coating step is continued to be used as part of the final product. Therefore, it is not necessary to simplify the process by inserting or removing the dummy core as in the conventional manufacturing method. As a result, the cost of the rubber roller is also reduced. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs In the coating step, the inner diameter of the tube is preferably 0.5 times or more and 0.9 times or less the outer diameter of the shaft core. With this, the shaft core and the tubular body can be reliably brought into close contact. The method of coating the tubular core with a smaller inner diameter than the outer diameter of the shaft core may be a press-in method or a lateral extruder to extrude it. When using a cross-head extruder, insert the shaft core into the head and cover the shaft core while extruding the tube. In addition, in the case of using a horizontal extruder, when the tubular object is extruded and the shaft core is not inserted, the inner diameter of the tubular object is 0.5 times to 0.9 times the outer diameter of the shaft core. 7 Jade paper scale is applicable to Chinese National Standard (CNS) A4 (2K) X 29? Mm) 555638 A7 B7 7363pif.doc / 008 V. Description of the invention (t) Where a horizontal extruder is used, it is better to attract Method, while the tube and the shaft core are in a negative pressure state, and the tube is covered on the shaft core. According to this, the shaft core and the tubular body can be reliably brought into close contact. In the case of suction, the inner diameter of the tube may exceed 0.9 times the outer diameter of the shaft core. This manufacturing method is not only suitable for forming a rubber roller from a shaft core and a foamed rubber layer, but also suitable for manufacturing a rubber roller provided with a solid rubber layer and other layers on the foamed rubber layer. Moreover, the solid rubber layer is a rubber layer which is substantially free of air bubbles. Brief Description of the Drawings Fig. 1 is a perspective view showing a rubber roller 1 according to an embodiment of the present invention; and Fig. 2 is a partial cross-sectional view showing a coating step of the rubber roller 1 of Fig. 1. Explanation of the signs in the picture _ · 1: Rubber roller 3: Shaft core 5: Foam rubber layer 7: Cross-head extruder 9: Cylinder 8 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) ) -------- < ---- install— (Please read the precautions on the back before filling out this page) Order: Printed by the Intellectual Property Bureau Staff Consumer Cooperatives of the Ministry of Economic Affairs 555638 Employee Consumption of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by the cooperative A7 7363pif.doc / 008 R7 --------- * 'V. Description of the invention (B) 11: Screw 13: Head 15: Mouth metal 17: Inner tube 19: Rubber composition 21 : Tubular object 23: Detailed description of a preferred embodiment of the insertion port The following is a description of embodiments of the present invention with reference to the drawings. Fig. 1 is an oblique view of a rubber roller 1 according to an embodiment of the present invention. This rubber roller 1 includes a shaft core 3 and a foamed rubber layer 5. The cross section of the shaft core 3 has a circular rod shape, and the foamed rubber layer 5 has a cylindrical shape. The outer peripheral surface of the shaft core 3 and the inner peripheral surface of the foamed rubber layer 5 are in contact with each other. The material of the shaft core 3 is not particularly limited, and for example, synthetic resin, metal, or the like can be used. In the case of using a charging roller, a developing roller, and a photocopying roller, the rubber roller 1 must be conductive. Since the shaft core 3 must also be conductive at this time, the shaft core 3 is usually made of a metal material. The foamed rubber layer 5 is formed by bridging with a rubber composition. The rubbers used are, for example, ethlene-propylene-diene copolymer, styrene-butadiene copolymer, 9 This paper is in accordance with China National Standard (CNS) A4 (210 X 297 public reply) (Please read the phonetic on the back? Matters before filling out this page)

555638 A7 B7 7363pif.doc / 008 V. Description of the invention ()) Natural rubber, butadiene rubber, isoprene rubber, silicon rubber, propionitrile- Butadiene copolymer (acrylonitrile-butadiene copolymer), hydrogenated propylene moon-butadiene copolymer, chloroprene rubber (chloroprene rubber), acrylic rubber (acrylic rubber), polyurethane rubber (urethane rubber), Epichlorohydrin rubber and the like are listed above. The foamed material layer 5 contains air bubbles. The bubbles are formed by foaming of a foaming agent. Suitable foaming agents include, for example, azodicrabonamide, N, N-dinitrosopentamethylenetetramine (N, N-dinitrosopentamethylene), and the like as the chemically reactive organic foaming agents listed above. Foaming usually occurs at the same time as rubber heating and bridging reactions. The compounding amount (mass ratio) of the chemically reactive foaming agent foaming agent is about 3 or more and 12 or less based on 100 parts of the rubber. If the blending amount is less than the range described above, the foaming ratio is reduced, and the flexibility of the rubber roller 1 is insufficient. Conversely, if the blending amount exceeds the above range, the foaming agent may hinder the bridging reaction and the strength of the rubber roller 1 may be insufficient. The foaming ratio of the foamed rubber layer 5 is preferably 2 times or more and 15 times or less. Especially, it is more preferably 3 times or more and 6 times or more. When the expansion ratio is less than the above range, the flexibility of the rubber roller 1 becomes insufficient. On the other hand, if the expansion ratio exceeds the above range, the strength of the rubber roller 1 becomes insufficient. The thickness of the foamed rubber layer 5 is not particularly limited, usually at 2mm 10 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) -------- J --- 4 Pack --- (Please read the notes on the back before filling out this page) Order Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 555638 7363pif.doc / 008

5. Description of the invention) Above and below 10mm. If the thickness is less than the above range, the flexibility of the rubber roller will be impaired, and if the thickness exceeds the above range, the degree of the rubber roller will be insufficient. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. For use in W electric rollers, development rollers, and copy rollers, the foamed rubber layer 5 must be conductive. Generally, an electrically conductive material such as carbon black or metal powder is blended to impart conductivity to the foamed rubber layer 5. In addition, acrylic copolymers, hydrogenated diene copolymers, chloroprene copolymers, chloroprene rubber, acrylic rubber, polyurethane rubber, epichlorohydrin rubber, etc. are used, which have ion conductivity and polymers themselves. The electrical resistance of the rubber is small, while imparting conductivity to the foamed rubber layer. The use of these rubbers does not require the use of electronically conductive materials. Of course, an ion-conducting rubber may be used in combination with an electron-conducting substance. This rubber roller 1 is composed of a shaft core 3 and a foamed rubber layer 5. A solid rubber layer may be provided on the foamed rubber layer 5. In addition, other layers may be provided between the foamed rubber layer 5 and the solid rubber layer, or on the solid rubber layer. Fig. 2 is a partial sectional view showing a coating step of the rubber roller 1 of Fig. 1. This picture shows a horizontal head extruder. This hoe extruder 7 is provided with a cylinder 9, a screw 11, a head Π, a mouth metal 丨 5, and an inner cylinder 丨 7. The cylinder 9 is filled with a rubber composition 19 (foamable rubber composition) containing a foaming agent. With the rotation of the screw 11, the rubber composition 19 advances forward (to the right in FIG. 2) to the head I3. This rubber composition 19 is changed from the head 13 to the 11 -------.----------------------- Order (Please read the precautions on the back before filling this page)% of this Paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) — 555638 A7 B7 7363pif.doc / 008 V. Description of the invention (^) Change the direction of the downward direction, extrude from the mouth metal 15 to form a tube物 21. On the other hand, the shaft core 3 is inserted through the insertion port 23 of the cylinder 17. This shaft core 3 passes through the inner cylinder 17 and is discharged by the mouth metal 15 and advances downward. A tubular object 21 is covered by the vicinity of the mouth metal 15 and the outer periphery of the shaft core 3. The inner diameter of the tube 21 (the inner diameter when the tubular object 21 is pushed out and the shaft core 3 is not inserted) is preferably 0.5 times or more and 0.9 times or less the outer diameter of the shaft core 3. That is, in this rubber roller 1, the inner diameter buckle of the tubular object 21 and the outer diameter 轴 s of the shaft core 3 are preferably to satisfy the following mathematical formula (1). [Mathematical formula 1] X 0.5 < φτ < < psx 0.9 ............ (I)

According to this, the inner diameter of the tubular object 21 is smaller than the outer diameter of the shaft core 3, and the tubular object 21 is forcibly inserted into the shaft core 3. As a result, the air between the shaft core 3 and the tubular body 21 is exhausted, and the shaft core 3 and the tubular body 21 are brought into a close state. The inner diameter of the tubular body 21 exceeds 0.9 times the outer diameter of the shaft core 3, and the effect of exhausting the air becomes insufficient. On the other hand, if the inner diameter of the tubular object 21 is less than 0.5 times the outer diameter of the shaft core 3, it becomes difficult to perform coating work. From this viewpoint, the inner diameter of the tube 21 is more preferably 0.6 times or more and 0.85 times or less, and more preferably 0.65 times or more and 0.8 times or less. In addition, the close state of the shaft core 3 and the tubular object 21 must be able to cover the entire effective length of the finished product. Q 12 The size of the mound paper is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) ^--------- 1 ---- ^ Loading --- (Please read the precautions on the back first Refill this page) Order · Printed by the Employees' Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 555638 7363pif.doc / 008 A7 B7 V. Description of the invention (0 It is better to be attracted and pushed out by the insertion port 23-click here Negative pressure exists between the tubular object 21 and the shaft core 3 near the metal part 15 'Both can be reliably brought into close contact. When suctioning, the inner diameter of the tubular object 21 may exceed the outer diameter of the shaft core 3 by 〇 · 9 times. Of course, when the inner diameter of the tubular body 21 is 0.5 times or more and 0.9 times or less the outer diameter of the shaft core 3 when the suction is performed, the tubular body 21 and the shaft core 3 can be reliably adhered to each other. FIG. 2 shows a tubular body 21 formed only of a foamable rubber composition. However, a so-called co-extrusion may be used to form an inner layer composed of a foamable rubber composition and a solid rubber composition. Outer tube. In this case, insert the shaft core 3 through the insertion port 23, and cover the tube with the shaft core 3. In addition, you can also use the cross-head extruder 17 to form a tube only from the foamable rubber composition, and then cover the surface of the tube with a solid rubber composition. T ---- ^ 装 --- (Please read first Note on the back, please fill in this page again.) Order% Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. Also, you can use an extruder without inner tube 17 to extrude the tube, and then force the tube into the core 3 In this case, the inner diameter of the tubular object is also 0.5 times or more and 0.9 times or less of the outer diameter of the shaft core 3, especially 0.6 times or more and 0.85 times or less of the outer diameter of the shaft core 3. In particular, it is more preferably 0.65 times or more and 0.8 times or less, in order to squeeze out the air between the shaft core 3 and the tubular object to achieve a close state of both. When forcedly pressed, water, alcohol, etc., which are used as lubricant ， Coated on the outer peripheral surface of the shaft core 3 and the size of the tube This paper applies the Chinese National Standard (CNS) A4 specification (2) 0 X 297 issued 555638 A7 B7 7363pif.doc / 008 V. Description of the invention The inner peripheral surface of the machine. Also, the machine can be machined while blowing compressed air. Forced press-in. The tubular object 21 coated on the shaft core 3 is bridged by heating (bridging step). The bridge can be performed by using a metal mold, and it can also be performed by a vulcanization tank. When the bridge is bridged, the foaming agent is foamed to form Foamed rubber layer 5. The following is a description of examples to make the effect of the present invention more clear, but the description of this example cannot be interpreted to limit the present invention. Also, the following description of the blending amount The numbers shown in the "Ministry" are ratios based on mass. [Example 1] 80 parts of acryl-butadiene copolymer (trade name of Nippon Synthetic Rubber Co., Ltd. "N215SL") and ene-propylene -20 diene terpolymers (Mitsui Petrochemical Corporation's trade name "EPT4021"), 5 carbon blacks (Tokai Carbon Corporation's trade name "Seast3"), glycerol tristearate (stearic acid) (Japan Oil and Fat Company) 1, foaming agent (Yonghe Chemical Industry Co., Ltd. "VINYFOR AC # 3") 7, other foaming agent (Yonghe Chemical Industry Co., Ltd. "NEOCELLBORN N5000") 3, sulfur ( Tsurumi Chemical Company's trade name "powder sulphur") 1.5 parts of diethyltetrathithuram disulfide as a vulcanization accelerator (trade name "Nokishila TET" of Onai Shinko Chemical Industry Co., Ltd.) Part 1.5, 2-Hydroxythiobenzopyrazole as other vulcanization accelerator (2- 14 ^ paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 mm) ------- -1 --- ^ Attachment --- (Please read the precautions on the back before filling out this page) Order · Printed by the Intellectual Property Bureau Staff Consumer Cooperative of the Ministry of Economic Affairs 555638 7363pif.doc / 008 A7 B7 Printed by the cooperative 5. A description of the invention ((q mecaptobenzothiazol) (trade name "Nokishila M" of Onai Shinko Chemical Industry Co., Ltd.) and N-cyclohexyl-2-time expansion as other vulcanization accelerators N-cyclohexyl-2-benzthiazolesulfenamide (trade name "Nokhira CZ" by Onai Shinko Chemical Co., Ltd.) was kneaded to obtain a foamable rubber composition. This rubber composition was put into a cylinder of a cross-head extruder (manufactured by Nakata Engineering) having a screw diameter of 90 mm and a screw diameter ratio (L / D) of 18. Then, with a temperature of 40 ° C for the screw, 40 ° C for the cylinder, 40 ° C for the head, and 10rpm for the rotation speed of the screw, the tubular with an inner diameter of 5.5mm was extruded. On the one hand, a shaft core having an outer diameter of 0.6 mm is inserted through the insertion port, and is attracted by one side of the insertion port, and the surface of the shaft core is covered with a tubular object. Secondly, the shaft core and the tube are put into a vulcanization tank and heated to bridge the tube. The foaming agent is foamed while bridging to form a foamed rubber layer. The surface of this foamed rubber layer was honed using a grindstone in a usual manner to obtain the rubber roller of Example 1. [Example 2] The suction is not performed through the insertion port, and other implementation conditions are the same as those of Example 1 to obtain a rubber roller of Example 2. [Example 3] The same rubber composition as in Example 1 was extruded using a general extruder to obtain a tubular object having an inner diameter of 5.5 mm. While paying attention to the situation where the tubular object was not deformed, it was forcibly pushed in as in Example 1. The same shaft core (outer diameter 15 (please read the precautions on the back before filling in this page) Order · ·; Line-This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 555638 7363pif.doc / 008 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention 0.6mm). Ethanol was used as the lubricant during forced pressing, and the tube was bridged in the same manner as in Example 1 to form a foamed rubber layer. This foamed rubber layer was honed in the same manner as in Example 1 to obtain a foamed rubber layer of Example 3. [Comparative Example] The same rubber composition as in Example 1 was extruded with a general extruder to obtain a tubular body having an inner diameter of 5.5 mm, and this tubular body was inserted into a dummy core having an outer diameter of 2.0 mm, and was hung in a sulfurization tank Bridging was carried out to obtain a cylindrical body composed of a foamed rubber layer. This cylindrical body was forced into the same shaft core (outer diameter 0.6 mm) as in Example 1. Ethanol is used as the lubricant when forcibly pressing. This foamed rubber layer was honed in the same manner as in Example 1 to obtain a foamed rubber layer of a comparative example. [Evaluation of Surface Smoothness] The rubber roller was placed on a flat surface. Then illuminate the light in a direction perpendicular to the axis direction, and visually observe the light exposed between the rubber roller and the platform. Those who have not exposed the light at all are indicated by "◎", those who have hardly exposed the light are indicated by "0", those who have exposed a lot of light are indicated by "X". The results are shown in Table 1 below. [Evaluation of Workability] The workability was evaluated during honing. The adhesion (adhesion force) of the shaft core and the foamed rubber layer is quite high, and those with high reliability during mass production are marked with "◎". 16 This paper size is in accordance with the Chinese National Standard (CNS) A4 specification (210 X 297 mm). L Pack --- (Please read the precautions on the back before filling this page) Order ·

555638 A7 Β7 7363pif.doc / 008 5. The invention description (丨) 〇 indicates that those with high adhesion and hardly causing problems during honing are indicated by “〇”. The results are shown in Table 1 below. [Manufacturing costs] Those who are quite favorable in terms of manufacturing costs are indicated by "◎", those that are slightly favorable are indicated by "△", those who need improvement are indicated by "X". This evaluation is shown in Table 1 below. Table 1

Example 1 Example 2 Example 3 Comparative Example Extruder Crosshead Extruder Crosshead Extruder Normal Extruder Usually Extruder Covering Method Crossing Front Bridge Front Front Bridge Front Crossing Bridge Front Extrusion Covering Extrusion Covering Forced Pressing Forced Pressing Attracted by M — surface smoothness ◎ 〇〇 workability ◎ 〇〇 manufacturing cost ◎ ◎ XX From the rubber roller of each example in Table 1 and the rubber roller of the comparative example, it can be understood that the overall evaluation is better . As a result of this evaluation, the superiority of the present invention was confirmed. As explained above, the shaft and foam rubber of the rubber roller of the present invention 17 -------- f --- (Please read the precautions on the back before filling this page) Staff of the Intellectual Property Bureau of the Ministry of Economic Affairs Printed by Consumer Cooperatives

This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 555638 7363pif.doc / 008 V. Description of the invention (()) The adhesive force of the adhesive layer is high and uniform. A7 B7 And, this rubber roller ^ 1 ^ 1 値 — · 1 i ^ · —ϋ (Please read the precautions on the back before filling out this page) Order · Thread · Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives 8 11 copies Paper size applies to China National Standard (CNS) A4 (210 X 297 mm)

Claims (1)

555638/008 A8 B8 C8 D8 6. Scope of patent application 1. A method for manufacturing a rubber roller, including the following steps: a coating step, a tube made of a rubber composition containing a foaming agent is tightly adhered The state is covered on the surface of a shaft core; and a bridging step of heating the tube to bridge the rubber composition while causing the foaming agent to foam. 2. The method for manufacturing a rubber roller according to item 1 of the scope of patent application, wherein the inner diameter of the tubular object is 0.5 times to 0.9 times the outer diameter of the shaft core. 3. The method for manufacturing a rubber roller according to item 1 or 2 of the scope of the patent application, wherein the method for achieving the covering step includes extruding the tube with a Crosshead extruder, and pressing the tube Covered on the shaft core inserted into the cross-head extruder. 4. The method for manufacturing a rubber roller according to item 3 of the scope of patent application, which includes performing suction to make the tubular object and the shaft core in a negative pressure state, and coating the shaft core of the tubular object. . 5. A rubber roller manufactured by the manufacturing method described in any one of items 1 to 4 of the scope of patent application, the rubber roller is provided with a shaft core; and a shaft core provided on the shaft core; A foamed rubber layer. 6. The rubber roller according to item 5 of the scope of patent application, wherein a solid rubber (Solid nibbei *) layer is further provided on the foamed rubber layer. 19 -------- 14 .-- ^ Loading --- (Please read the precautions on the back before filling out this page) Printed on paper standards of the Ministry of Economic Affairs and Intellectual Property Bureau's Consumer Cooperatives, this paper applies Chinese national standards (CNS ) A4 size (210 x 297 mm)