JP2003128296A - Paper feeding roller and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper feeding roller and a manufacturing method thereof, capable of significantly preventing roughening or adhesion of die chips, providing sufficient coefficient of friction, and being stably manufactured at low cost. SOLUTION: This paper feeding roller (a paper feeding roller 1) constituted of one, or two or more layers, of which the outmost periphery is formed by pushing out elastomer composition, which is formed by dispersing rubber particles dynamically cross-linked by a resin bringing material into a heat plastic polymer, from a cylindrical flow path of a mouthpiece, a cross sectional shape of the outer wall surface constituting the flow path of the mouthpiece having projections and depressions, and a fluororesin coating is applied to the wall surface constituting the flow path. Preferably, an ethylene - propylene -diene copolymer is used for a main component of base material rubber of rubber particles, and styrene base thermoplastic elastomer is used for a main component of the thermoplastic polymer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feed roller mounted on office equipment or the like.

[0002]

2. Description of the Related Art Copiers, facsimiles, printers, A
A paper feed roller (called a paper feed roller, a conveyance roller, a paper discharge roller, etc.) is used for a paper feed mechanism, an image forming mechanism, a fixing mechanism, a paper discharge mechanism, etc. of office equipment such as TM. . Since this paper feed roller feeds paper, it is required to have a high coefficient of friction with the paper, and it is also required to maintain this high coefficient of friction for a long period of time.

As such a paper feed roller, rubber-made ones are widely used, and specifically, ethylene-propylene-diene copolymer (EPDM), polyurethane, polynorbornene, silicone rubber, chlorinated polyethylene, natural rubber and the like are used. Used. However, since such a paper feed roller made of rubber does not melt even when heated, it cannot be reused as a raw material polymer. Therefore, in order to improve recyclability and manufacturing difficulty, a paper feed roller made of an elastomer composition in which rubber particles dynamically cross-linked by a resin cross-linking agent are dispersed in a thermoplastic polymer has been developed (special feature). Kaihei 11-3481
49). The paper feed roller made of this elastomer composition maintains a high friction coefficient due to the dispersed rubber particles even if it is worn over time, and the thermoplastic polymer as the matrix improves the moldability of the roller.

On the other hand, the paper feed roller made of the above-mentioned elastomer composition has a peripheral surface ground or a knurled surface (parallel to the axial direction) particularly for the purpose of developing an appropriate friction coefficient and improving the transportability. Such as forming a convex ridge). The means for grinding the peripheral surface of the paper feed roller causes an increase in cost due to an increase in the number of manufacturing processes, but the means for forming the peripheral surface in a knurled shape is formed by extrusion molding using a die with a cross-sectional shape of the discharge channel being uneven. It can be manufactured at a relatively low cost and without increasing the number of steps.

[0005]

However, according to the extrusion molding using the above-mentioned die, the peripheral surface of the manufactured paper-feed roller is caused to adhere to the surface of the paper feed or die residue, thereby lowering the product yield. . In order to prevent the occurrence of such crunch and the adhesion of die residue, a means for applying a composite plating containing polytetrafluoroethylene (PTFE) dispersed in a metal matrix to the inner peripheral surface of the die has been conventionally developed. However, it has not been possible to completely prevent the occurrence of the above-mentioned crispy and adherence of die residue.

The present invention has been made in view of these inconveniences, and it is possible to remarkably prevent the occurrence of scratches and adhesion of die residue on the peripheral surface, have a sufficient friction coefficient, and are stable and inexpensive. An object of the present invention is to provide a paper feed roller that can be manufactured and a manufacturing method thereof.

[0007]

The invention made to solve the above-mentioned problems is a paper feed roller composed of a single layer or two or more layers, the outermost layer of which is dynamically crosslinked by a resin crosslinking agent. Rubber particles are formed by extruding an elastomer composition in which a thermoplastic polymer is dispersed from a cylindrical channel of a die, and the cross-sectional shape of the outer wall surface forming the channel of the die has irregularities. The paper feed roller is characterized in that the wall surface forming the flow path of the die is coated with a fluororesin.

Since the paper feed roller is formed by extrusion molding using an elastomer composition in which rubber particles are dispersed in a thermoplastic polymer, it is like a paper feed roller formed of a conventional rubber material. No vulcanization process is required. Further, since the outer wall surface forming the flow path of the die has unevenness in cross section, it is possible to simultaneously form a knurled shape on the outer peripheral surface by extrusion molding of the outermost layer. Furthermore, since the wall surface that constitutes the flow path of the die is coated with a fluororesin, the occurrence of scratches and adhesion of die residue during extrusion molding is significantly reduced, and its action is maintained for a long time. You can Due to the synergistic effect of these actions, the paper feed roller can remarkably increase its production efficiency. Also,
Since the matrix of the outermost layer is a thermoplastic polymer, it can be melted by heating and reused as a polymer raw material after use. Further, the friction coefficient of the paper feed roller is optimized by the rubber particles dispersed in the matrix. Therefore, according to the paper feed roller,
It is possible to stably and inexpensively manufacture a product having a uniform paper feeding performance. When the paper feed roller is composed of a single layer, this layer is the outermost layer.

An ethylene-propylene-diene copolymer is preferred as the main component of the base rubber of the rubber particles. As described above, by using the ethylene-propylene-diene copolymer as the main component of the base rubber of the rubber particles, the weather resistance of the paper feed roller is improved and the dispersibility in the thermoplastic polymer is excellent.

A styrene-based thermoplastic elastomer is preferable as the main component of the thermoplastic polymer. Thus, by using the styrene-based thermoplastic elastomer as the main component of the thermoplastic polymer, the workability of the paper feed roller is improved.

Another invention made in order to solve the above-mentioned problems is (a) an elastomer composition forming step of blending a thermoplastic polymer, a base rubber and a resin crosslinking agent, kneading and heating, b) an extrusion molding step of extruding the elastomer composition from a cylindrical channel of a die, the outer wall surface of which constitutes the channel as the die has unevenness in cross section, and constitutes a channel. Is a method for manufacturing a paper feed roller in which a wall surface of the paper feed roller is used. According to the method for manufacturing the paper feed roller,
The paper feed roller having a knurled outer peripheral surface and an appropriate friction coefficient can be stably manufactured at low cost.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a paper feed roller (corresponding to a paper feed roller) according to an embodiment of the present invention together with a shaft core, and FIG. 2 is a view showing a die used for manufacturing the paper feed roller of FIG.

The paper feed roller 1 shown in FIG. 1 is a cylindrical elastic body, and is rotatably mounted on a paper feed mechanism such as a copying machine.
It is fitted onto the shaft core 2. The means for externally fitting the paper feed roller 1 onto the shaft core 2 is not particularly limited, but generally, means for simply press-fitting the shaft core 2 into the hollow portion of the paper feed roller 1 or both of them with an adhesive agent. Means of joining are adopted. The size of the paper feed roller 1 is not particularly limited and may be appropriately selected depending on the intended use, but its thickness is usually 1 mm to 8 mm, particularly 2 mm to 5 mm, and its total length is usually 10 mm. To 100 mm.

The method of manufacturing the sheet feeding roller 1 includes a step of forming an elastomer composition as a raw material, and a step of forming the sheet feeding roller 1 from the elastomer composition.
And an extrusion molding step of forming by extrusion molding.

In the step of forming the elastomer composition, a thermoplastic polymer, a base rubber, a resin crosslinking agent and other additives are blended, kneaded and heated to dynamically crosslink the base rubber to form a fine rubber. An elastomer composition is obtained in which the particles are dispersed in the thermoplastic polymer. As a kneading means for this compound, a known kneader such as an open roll, a Banbury mixer, a kneader, a single-screw extruder or a twin-screw extruder is used.

This elastomer composition has the advantages of the thermoplastic polymer as the matrix and the advantages of the rubber particles as the dispersoid. That is, since this elastomer composition is melted by heating due to the matrix of the thermoplastic polymer, the step of vulcanizing by placing it in a mold such as a conventional paper feed roller made of rubber is unnecessary, and a die described later was used. The paper feed roller 1 can be easily manufactured by extrusion molding. Further, the paper feed roller 1 manufactured from this elastomer composition is provided with an appropriate friction coefficient by the rubber particles uniformly and finely dispersed in the matrix, and the friction coefficient is maintained even if it is worn due to use.

As the matrix thermoplastic polymer, a thermoplastic elastomer having a soft segment and a hard segment, or a thermoplastic resin is used. The thermoplastic elastomer is not particularly limited and known materials can be used. Among them, styrene-based thermoplastic elastomer is preferable, and hydrogenated styrene-based thermoplastic elastomer is particularly preferable. This styrene-based thermoplastic elastomer contains a block copolymer composed of a polystyrene end block and an elastomer middle block as a main component, and is suitable for the above extrusion molding. Further, in the hydrogenated styrene-based thermoplastic elastomer, since the double bond is eliminated by the hydrogenation of the intermediate block, the hydrogenated styrene-based thermoplastic elastomer is not crosslinked during dynamic crosslinking. Specific examples of the hydrogenated styrene-based thermoplastic elastomer include styrene-ethylene-styrene copolymer (SE
S), styrene-ethylene / propylene-styrene copolymer (SEPS), styrene-ethylene / butylene-styrene copolymer (SEBS), and other hydrogenated substances.

Polyolefin is preferable as the thermoplastic resin. Since the molecular chain of this polyolefin is saturated, it will not be crosslinked during dynamic crosslinking and will not increase the hardness of the elastomer composition, and is suitable for extrusion molding. Further, since polyolefin is generally inexpensive and easily available, the production cost of the paper feed roller 1 can be suppressed by using it. Specific examples of the polyolefin include polypropylene, polyethylene, ethylene-ethyl acrylate resin, ethylene-vinyl acetate resin, ethylene-methacrylic acid resin, and ionomer resin. Further, polypropylene or polyethylene polymerized by a so-called metallocene catalyst can also be suitably used. Furthermore, ultra high molecular weight polyethylene can also be used suitably. These polyolefins may be used alone or in combination of two or more. Among the polyolefins, polypropylene is particularly suitable from the viewpoints that the abrasion resistance of the paper feed roller 1 is improved, the moldability is good, the cost is low, and the like.

In particular, the thermoplastic polymer that is the matrix preferably contains a hydrogenated styrene thermoplastic elastomer as a main component. Specifically, the proportion of the hydrogenated styrene thermoplastic elastomer in the total thermoplastic polymer is preferably 50% by mass or more, and particularly preferably 80% by mass or more.

The base rubber of the rubber particles includes ethylene-propylene-diene copolymer, polybutadiene, styrene-
Butadiene copolymer, polyisoprene, acrylonitrile-butadiene copolymer, ethylene-propylene copolymer, polyurethane, polychloroprene, acrylic rubber,
Silicone rubber, chlorosulfonated polyethylene, natural rubber and the like can be used.

A particularly suitable rubber is an ethylene-propylene-diene copolymer. Since the main chain of the ethylene-propylene-diene copolymer is composed of saturated hydrocarbon, this main chain does not contain a double bond. Therefore, the ethylene-propylene-diene copolymer is less likely to undergo molecular main chain scission (that is, has excellent weather resistance) even when exposed to an environment such as a high-concentration ozone atmosphere or light irradiation. Ozone may be generated during image formation in copiers, etc.
By using the propylene-diene copolymer, ozone deterioration of the paper feed roller 1 is suppressed. The ethylene-propylene-diene copolymer is also relatively excellent in dispersibility in the thermoplastic polymer.

The ethylene-propylene-diene copolymer may be used in combination with other rubber. Even in this case, from the viewpoint of maintaining the weather resistance of the paper feed roller 1, it is preferable that the ethylene-propylene-diene copolymer is the main component. Specifically, the proportion of the ethylene-propylene-diene copolymer in the total base rubber is preferably 30% by mass or more, more preferably 50% by mass or more, and particularly preferably 80% by mass or more.
From the viewpoint of weather resistance, the higher the ratio of the ethylene-propylene-diene copolymer to the total rubber is, the more preferable it is. Therefore, the upper limit value is not particularly specified in the present invention.

As the ethylene-propylene-diene copolymer, there are a non-oil-extended type composed of only a rubber component and an oil-extended type containing an extending oil together with the rubber component. Either type can be used. When an oil-extended ethylene-propylene-diene copolymer is used, the ratio of the rubber component excluding the extender oil to the total base rubber is within the above range (30% by mass or more, further 50%). Mass% or more, especially 80 mass%
Above).

The smaller the particle diameter, the more preferable because the rubber particles are uniformly dispersed in the matrix. Specifically, the average particle diameter of the rubber particles is preferably 10 μm or less, and 5 μm
m or less is particularly preferable. The smaller the average particle diameter is, the more preferable. However, the average particle diameter of rubber particles usually obtained is 0.1.
It is at least μm.

The mass ratio of the base rubber to the thermoplastic polymer is preferably 30/70 or more and 80/20 or less. If the mass ratio is less than the above range, the coefficient of friction of the paper feed roller 1 may be small. From this viewpoint, the mass ratio is more preferably 40/60 or more, and particularly preferably 50/50 or more. If the mass ratio exceeds the above range, the thermoplastic polymer may not be a matrix, and it may be difficult to plasticize the elastomer composition. From this viewpoint, the mass ratio is particularly preferably 70/30 or less. When the oil-extended rubber is used, the mass ratio of the rubber component and the thermoplastic polymer in the oil-extended rubber is set within the above range.

The base rubber is crosslinked with a resin crosslinking agent. By using the resin cross-linking agent, blooming that tends to occur when the rubber is cross-linked by sulfur and the vulcanization accelerator is suppressed. Therefore, a decrease in the friction coefficient of the paper feed roller 1 due to blooming is prevented. Examples of preferable resin crosslinking agents include alkylphenol-formaldehyde resins. In addition, halides of this alkylphenol-formaldehyde resin (chlorine,
Bromides, fluorides, iodides, etc.) are also preferably used. These resin cross-linking agents are preferable because they have excellent compatibility with rubber, are highly reactive, and accelerate the cross-linking reaction start time.

The compounding amount of the resin cross-linking agent is as follows:
It is preferably 1 part or more and 20 parts or less with respect to 00 parts (100 parts of rubber component in the case of oil-extended rubber). If the blending amount is less than the above range, the crosslinking may be insufficient and the durability of the sheet feeding roller 1 may be reduced. From this point of view, the compounding amount is particularly preferably 3 parts or more. If the blending amount exceeds the above range, the elastomer composition may be thermally deteriorated due to abnormal heat generation during kneading. From this point of view, the content is particularly preferably 15 parts or less. In this specification, the numerical value indicated by "part" is
It means the ratio when the mass is taken as the standard.

The elastomer composition includes oil,
A softening agent such as a plasticizer may be blended. As a result, the paper feed roller 1 has a low hardness and its friction coefficient is improved. Examples of the oil to be blended include paraffinic mineral oil, naphthenic mineral oil, aromatic mineral oil, and hydrocarbon oligomer. Examples of the plasticizer to be blended include dioctyl phthalate, dibutyl phthalate, dioctyl separate, dioctyl adipate and the like. When the oil-extended type rubber is used, the extender oil acts as a softening agent, and thus the blending of other softening agents may be omitted. Of course, if necessary, a softening agent may be further added to the oil-extended type rubber.

A polyamide resin may be blended with this elastomer composition. Since the paper feed roller 1 containing the polyamide resin is difficult to be charged as described above, it is presumed that the adhesion of the paper powder is suppressed and the reduction of the friction coefficient with the paper is suppressed. In addition, an appropriate amount of a filler, an antioxidant, a colorant, a cross-linking aid, a reinforcing agent and the like may be added to the elastomer composition, if necessary.

Next, in the extrusion molding step, the elastomer composition is extruded from the die 4 (see FIG. 2).
The paper feed roller 1 is formed. This base 4 is shown in FIG.
2C, and the cylindrical mandrel 6 shown in FIG. 2B. The mandrel 6 has a predetermined space in the outer die 5 as shown in FIG. 2C. Have been inserted and fixed. A cylindrical flow path 7 is formed between the outer die 5 and the mandrel 6, and the elastomer composition is extruded through the flow path 7 to form the cylindrical paper feed roller 1. On the outer wall surface of the flow path 7, that is, on the inner peripheral surface of the outer die 5, as shown in FIG. 2D, substantially triangular pillar-shaped ridges 8 are formed at substantially equal intervals in the axial direction. As a result, the cross-sectional shape of the outer wall surface of the flow path 7 has irregularities. Therefore, on the outer peripheral surface of the sheet feeding roller 1 extruded from the flow path 7, the ridge grooves 3 which are the inverted shape of the ridges 8 are formed at substantially equal intervals in the axial direction (see FIG. 1). By thus forming the knurled shape on the outer peripheral surface of the paper feed roller 1, the coefficient of friction of the outer peripheral surface is increased and the reliability of paper feeding is improved. The size of the knurled shape on the outer peripheral surface of the paper feed roller 1 is not particularly limited and may be appropriately selected according to the intended use.
Preferably, the pitch of the ridges formed between the groove 3 is 1 mm
Hereinafter, the tip width of the ridge is 0.5 mm or less, and the height of the ridge is 1 mm or less.

The wall surface of the die 4 which constitutes the flow path 7, that is, the inner peripheral surface of the outer die 5 and the outer peripheral surface of the mandrel 6 are coated with a fluororesin. By applying the fluororesin coating in this way, the friction coefficient of the wall surface of the flow path 7 is remarkably reduced, and the fluororesin coating is excellent in durability, chemical resistance, heat resistance, etc. Therefore, the above elastomer composition was used. It is possible to remarkably reduce the amount of scratches and adhesion of die residue on the surface of the paper feed roller 1 which is likely to occur in extrusion molding, and to significantly improve the product yield.

The fluororesin used for this coating is not particularly limited, and examples thereof include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), fluorinated ethylene propylene copolymer (FEP), Examples thereof include perfluoroalkoxy elastomer (PFA), ethylene tetrafluoroethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), and the like. Above all,
A perfluoroalkoxy elastomer having excellent coating properties, durability and heat resistance is preferable.

The means for coating the above-mentioned fluororesin is not particularly limited and may be appropriately selected depending on the fluororesin used. In the case of polytetrafluoroethylene, perfluoroalkoxy elastomer, etc., spray spraying and drying may be repeated to apply evenly, and further heating may cause a curing reaction to occur and baking.

It should be noted that the paper feed roller 1 whose usage period has expired
Can be used as a raw material for a recycled polymer by being heated and melted, and can contribute to resource saving. Further, since the paper feeding roller 1 does not need to be discarded or incinerated by reuse, the paper feeding roller 1 does not adversely affect the global environment.

This paper feed roller 1 is composed of an elastomer composition in which rubber particles are dispersed in a thermoplastic polymer, and therefore, a thermoplastic elastomer (comprising a hard segment and a soft segment, which is a block copolymer). It is clearly distinguished from the paper feed roller made of The paper feed roller 1 including the dispersed rubber particles has an advantage that the compression set is small.

This paper feed roller 1 is composed of a single layer,
The above-mentioned layers may be laminated to form a paper feed roller.
In this case, the outermost layer is molded from the above-mentioned elastomer composition. Also in this paper feed roller, the reduction of the carrying force due to the attachment of paper dust and abrasion is suppressed.

The paper feeding roller of the present invention is not limited to the above-mentioned embodiment, and can be applied to, for example, a carrying roller and a discharging roller provided in a paper feeding mechanism.

[0038]

The present invention will be described in detail below based on examples.
The present invention is not limitedly interpreted based on the description of the examples.

[Example] 200 parts of an ethylene-propylene-diene copolymer containing 50% by mass of extender oil (trade name "Esprene 670F" manufactured by Sumitomo Chemical Co., Ltd.) (rubber component 100)
Part), hydrogenated styrene-based thermoplastic elastomer composition (trade name "SEPS CJ-001" by Kuraray Co., Ltd.) 20
0 parts, 10 parts of a brominated alkylphenol-formaldehyde resin (trade name "Tacchiroll 250-III" manufactured by Taoka Chemical Co., Ltd.) as a resin crosslinking agent and 5 parts of zinc oxide (trade name "Zinc oxide 2 types" manufactured by Mitsui Kinzoku Co., Ltd.) Then, the mixture was kneaded while being heated to 180 ° C. for dynamic cross-linking to obtain an elastomer composition. In addition, this hydrogenated styrene-based thermoplastic elastomer composition includes a hydrogenated styrene-based thermoplastic elastomer (trade name "SEPS407 manufactured by Kuraray Co., Ltd."
7 ") 100 parts, 170 parts of paraffin oil and 35 parts of polypropylene are mixed. Next, an extruder equipped with a perfluoroalkoxy elastomer (the product name "PFA 015C" manufactured by Nippon Fuso TechnoCoat Co., Ltd.) was coated on the wall surface of the flow path ("φ"
50 extruder ") to extrude the above elastomer composition to form a cylindrical body having an outer diameter of 50 mm, and further cut into a length of 15 mm to obtain a sheet feeding roller of Example 1.

[Comparative Example 1] Comparative Example 1 was performed in the same manner as in Example 1 except that the wall surface of the flow path of the die was not coated.
I got a paper feed roller.

[Comparative Example 2] A paper feed of Comparative Example 2 was carried out in the same manner as in Example 1 except that a composite plating containing polytetrafluoroethylene (PTFE) dispersed in nickel was applied to the wall surface of the flow path of the die. Got Laura.

[Comparative Example 3] Paper feeding of Comparative Example 3 was carried out in the same manner as in Example 1 except that composite plating containing polytetrafluoroethylene (PTFE) dispersed in chromium was applied to the flow path wall surface of the die. Got Laura.

[Comparative Example 4] A paper feed roller of Comparative Example 4 was obtained in the same manner as in Example 1 except that the flow path wall surface of the die was plated with hard chrome.

[Evaluation of Characteristics] The friction coefficients of the sheet feeding roller of the above-described example and the sheet feeding rollers of Comparative Examples 1 to 4 were measured by the method described in FIG. First, plain paper (“P paper” manufactured by Fuji Xerox Co., Ltd.) was cut into a rectangle having a length of 60 mm and a width of 210 mm to obtain a measurement paper 11. The measurement paper 11 is sandwiched between the paper feed roller 1 and the Teflon (registered trademark) plate 10, and a load W of 250 gf is applied to the shaft core 2 to feed the paper feed roller 1.
Was pressed against the Teflon plate 10. Next, the paper feed roller 1 was rotated clockwise at a peripheral speed of 50 mm / sec. Then, with the load cell 12 connected to one end of the measuring paper 11,
The force (gf) generated in the direction indicated by arrow F in FIG. 3 was measured. A value obtained by dividing the force F by the load W was obtained as a friction coefficient. The results are shown in Table 1 below.

In the extrusion forming step using the extruder in the steps of manufacturing the paper feed rollers of the above Examples and Comparative Examples 1 to 4, the time until the adhesion of die residue on the surface of the extruded cylinder is , And the time until the occurrence of blemishes were measured. The results are shown in Table 1 below.

[0046]

[Table 1]

As shown in Table 1 above, the paper feed rollers of the examples have a higher coefficient of friction than the paper feed rollers of Comparative Examples 1 to 4, and the occurrence of scratches and the attachment of die residue is remarkable. Has been reduced to.

[0048]

As described above, according to the paper feed roller of the present invention, the friction coefficient is stably increased by applying the fluororesin coating to the die used for extrusion formation.
Further, as a result of drastically reducing the occurrence of crisping and adhesion of die residue, the product yield is improved and the reduction of manufacturing cost can be promoted.

[Brief description of drawings]

FIG. 1 is a perspective view showing a paper feed roller (corresponding to a paper feed roller) according to an embodiment of the present invention together with a shaft core.

2A and 2B are views showing a die used for manufacturing the paper feed roller of FIG. 1, where FIG. 2A is a front view of a half-section of an outer die constituting the die, and FIG. 2B is a mandrel constituting the die. Front view,
(C) is a central longitudinal end view of the die, and (d) is a partial (transverse) sectional view of the outer die.

FIG. 3 is a schematic diagram illustrating a method of measuring a friction coefficient of a sheet feeding roller.

[Explanation of symbols]

1 ... Paper feed roller 2 ... Shaft core 3 ... streak 4 ... clasp 5: Outside die 6 ... Mandrel 7 ... Flow path 8: Muscle 11 ... Measuring paper 10 ... Teflon plate 12 ... Load cell

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C08L 21/00 C08L 21/00 23/16 23/16 53/02 53/02 101/00 101/00 / / B29K 21:00 B29K 21:00 23:00 23:00 B29L 23:00 B29L 23:00 (72) Inventor Takayuki Tanaka 3-6-9 Wakihama-cho, Chuo-ku, Kobe-shi, Hyogo Sumitomo Rubber Industries, Ltd. F-term (reference) 3F049 CA02 CA11 CA14 LA02 LA05 LA07 LB03 4F070 AA04 AA08 AA71 AB01 AB08 AB09 AB11 FA03 FB06 GA09 GB01 4F207 AA09 AA13 AA45 AB03 AC01 AG03 AG08 AG21 AH04 AH33 AH53 AJ03 AJ09 KA01 KA17 KB22 KW41 4J002 AC01W AC03W AC06W AC07W AC08W AC09W BB03X BB06X BB07X BB08X BB12X BB15W BB23X BB27W BG04W BP01X CK02W CP03W FD020 GF00 GM00

Claims (4)

[Claims] 1. A paper feed roller comprising a single layer or two or more layers, the outermost layer of which comprises an elastomer composition in which rubber particles dynamically crosslinked by a resin crosslinking agent are dispersed in a thermoplastic polymer. It is formed by extruding from the cylindrical flow path of this.The cross-sectional shape of the outer wall surface that constitutes the flow path of the mouthpiece has irregularities, and the wall surface that constitutes the flow path of the mouthpiece is coated with a fluororesin. A paper feed roller characterized in that 2. The paper feed roller according to claim 1, wherein the main component of the base rubber of the rubber particles is an ethylene-propylene-diene copolymer. 3. The styrene-based thermoplastic elastomer as a main component of the thermoplastic polymer according to claim 1 or 2.
Paper feed roller described in. 4. An elastomer composition forming step of blending a thermoplastic polymer, a base rubber and a resin crosslinking agent, kneading and heating, and an extrusion molding step of extruding the elastomer composition from a cylindrical channel of a die. A paper feed roller is used as the die, in which the cross-sectional shape of the outer wall surface forming the flow path has irregularities and the wall surface forming the flow path is coated with a fluororesin. Manufacturing method.