JP2010076129A - Blade member-molding mold and method of molding blade member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blade member-molding mold keeping sufficient mold releasability for a long term without a mold release agent. <P>SOLUTION: In the blade member-molding mold molding the blade member composed of a thermosetting polyurethane resin as a major component and having international rubber hardness (IRHD) of not less than 60° and not more than 90°, the surface of the mold has a fluororesin-containing plated layer, Vickers hardness of not less than 300 Hv, and 10-point average roughness (RzJIS) of not less than 2 μm and not more than 25 μm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blade member molding die and a blade member molding method used when manufacturing a blade member used in an image forming apparatus using an electrophotographic process such as an electrophotographic copying machine, a laser beam printer, and a facsimile machine. Is.

  2. Description of the Related Art Conventionally, as a developing device in an image forming process of an electrophotographic apparatus such as an electrophotographic copying machine, a laser beam printer, and a facsimile, a developing device having a developer carrying member and a developer amount regulating blade has been widely used. The developer carrier is partially exposed at the opening of the developer container that stores the developer (toner), and the developer amount regulating blade is made of a rubber material that comes into contact with the surface of the developer carrier. It is formed. In addition, as a cleaning device in the photosensitive member cleaning process of the electrophotographic apparatus, after transferring to a recording sheet, a blade member is bonded to the support in order to remove the toner remaining on the photosensitive member and perform transfer repeatedly. Often used cleaning blades.

  The developer amount regulating blade is generally formed from a rubber plate, a metallic thin plate, a resin plate, or a laminate thereof. The developer amount regulating blade is made of a blade member pressed against the developer carrying member and a support member that supports the blade member at a predetermined position, and the blade member used has excellent wear resistance. Therefore, polyurethane elastomer is usually used.

  The cleaning blade is formed by integrating a metal support member for attaching the blade to an apparatus or the like, and a blade member made of an elastic body on the support member. Since the blade member is excellent in wear resistance and permanent set, a polyurethane elastomer is usually used.

  A cleaning blade and a developer amount regulating blade having such a polyurethane blade member have been conventionally manufactured by performing a cast molding operation using a polyurethane-forming material. For example, a mold composed of an upper mold and a lower mold is prepared, arranged in a state where one end portion of a support member protrudes into a cavity for forming a blade portion of a mold, and a liquid composition is placed in the mold. It can be manufactured by pouring, allowing this to undergo a curing reaction, and then demolding the cured product. It can also be manufactured by a centrifugal molding method in which a thermosetting resin is poured into the inner surface of a heated cylindrical molding die that rotates at high speed to obtain a planar sheet.

  In these molding methods, in order to efficiently release the cured product, a release layer made of a silicone composition or the like is formed in advance, or a saturated hydrocarbon type, silicone type, fluorine type having an inert and low energy surface. It is necessary to apply a release agent.

  A release layer made of a silicone composition or the like may cause defects due to foreign matters mixed in when forming the release layer, and may have a difficulty in durability when used for molding polyurethane elastomers. There are problems such as increasing the frequency of rewiring and increasing the number of processes.

  In addition, the use of a release agent may cause variations in toner charging due to the release agent component moving to a molded product, and may adversely affect the image. For this reason, a cleaning process is required, leading to an increase in the number of processes. Furthermore, in order to continue to obtain a stable release property over a long period of time, it is necessary to always reapply the release agent every time, and in addition, there is a problem that a uniform surface state must be maintained.

  Accordingly, an object of the present invention is to provide a blade member molding die that does not require the use of a release agent and has sufficient release properties over a long period of time.

In order to solve the above problems, the present invention proposes the following thermosetting polyurethane resin blade member molding die.
(1) A blade member molding die for molding a blade member mainly composed of a thermosetting polyurethane resin and having an international rubber hardness (IRHD) of 60 ° or more and 90 ° or less,
The surface of the mold has a plating layer containing a fluororesin, the Vickers hardness of the surface of the mold is 300 Hv or more, and the ten-point roughness average (RzJIS) of the surface of the mold is 2 μm or more. A blade member molding die having a thickness of 25 μm or less.

(2) A method of forming a blade member having an international rubber hardness (IRHD) of 60 ° or more and 90 ° or less by pouring thermosetting polyurethane resin as a main component into a blade member molding die,
A method for molding a blade member, wherein the mold of the present invention is used as the mold.

  The blade member molding die according to the present invention can mold a predetermined blade member without using a release agent. More specifically, the mold for molding a blade member according to the present invention is sufficient for a long period of time without using a release agent in the molding of a blade member made of a thermosetting polyurethane resin having a predetermined hardness. The blade member can be molded while maintaining releasability. Therefore, it is possible to manufacture a blade member that does not require the formation of a release layer and the application of a release agent, and does not cause image defects caused by the residual release agent, and can provide a good image.

  Furthermore, since the mold surface (the surface of the plating layer containing the fluororesin) has a predetermined hardness, durability is good. In addition, since the mold releasability on the molding die surface is improved, maintenance becomes easy and the number of processes can be reduced.

  Embodiments of the present invention will be described in detail.

  The present invention relates to a blade member molding die for molding a blade member mainly composed of a thermosetting polyurethane resin and having an international rubber hardness (IRHD) of 60 ° or more and 90 ° or less, and the surface of the die is made of fluorine. It has a plating layer containing a resin, the surface of the mold has a Vickers hardness of 300 Hv or more, and the ten-point roughness average (RzJIS) of the surface of the mold is 2 μm or more and 25 μm or less. This is a blade member molding die.

  Further, the present invention is a method for casting a blade member having an international rubber hardness (IRHD) of 60 ° or more and 90 ° or less by pouring a thermosetting polyurethane resin as a main component into a blade member molding die. A blade member forming method characterized by using the above die as a die.

  The blade member molding die according to the present invention will be described below.

(Thermosetting polyurethane resin)
The material constituting the blade member molded by the blade member molding die according to the present invention is mainly a thermosetting polyurethane resin. Polyurethane resin is excellent in wear resistance and mechanical properties. The thermosetting polyurethane resin is produced according to a prepolymer method, a semi one-shot method, a one-shot method, or the like using, for example, a polyisocyanate, a polyol, a chain extender, and a catalyst.

  For example, in the case of the prepolymer method, a prepolymer is prepared using a polyisocyanate and a polyol, a chain extender and a catalyst are added to the prepolymer, and a blade member raw material (thermosetting polyurethane resin raw material) is prepared. be able to. The raw material of the blade member is injected into a molding die and cured.

  Examples of the polyisocyanate include 4,4′-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), and xylene diisocyanate. (XDI), 1,5-naphthylene diisocyanate (1,5-NDI), p-phenylene diisocyanate (PPDI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), 4,4'-dicyclohexylmethane diisocyanate (water) Additive MDI), tetramethylxylene diisocyanate (TMXDI), carbodiimide-modified MDI, polymethylenephenyl polyisocyanate (PAPI) and the like. Among these, it is preferable to use MDI.

  Examples of the polyol include polyester polyol, polyether polyol, caprolactone ester polyol, polycarbonate ester polyol, and silicone polyol. It is preferable to use a polyol having a number average molecular weight of 1500 to 5000. By setting it as 1500 or more, the physical property of the urethane rubber obtained can be made favorable, and by setting it as 5000 or less, the viscosity of the prepolymer does not become too high, and handling can be made easy. Because.

  As the polyol, it is preferable to use a low molecular weight chain extender in combination. For example, glycol is used as a low molecular weight chain extender. Such glycols include ethylene glycol (EG), diethylene glycol (DEG), propylene glycol (PG), dipropylene glycol (DPG), 1,4-butanediol (1,4-BD), 1,6-hexane. Examples include diol (1,6-HD), 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, xylylene glycol (terephthalyl alcohol), and triethylene glycol. In addition to the glycol, other polyhydric alcohols are used. Examples of such polyhydric alcohols include trimethylolpropane, glycerin, pentaerythritol, sorbitol, and the like. These may be used alone or in combination of two or more.

  As the catalyst, a commonly used polyurethane curing catalyst can be used, and examples thereof include a tertiary amine catalyst.

  Further, the international rubber hardness (IRHD) of the blade member in the present invention is 60 ° or more and 90 ° or less. When the rubber hardness is lower than 60 °, when the molded product is removed from the blade member molding die, the shape cannot be held because it is too soft, and the dimensional accuracy is lowered. When the rubber hardness is higher than 90 °, chipping or cracking occurs in a part of the molded product when the molded product is removed from the blade member molding die. The international rubber hardness (IRHD) can be adjusted by setting the mixing ratio of the prepolymer and the curing agent, that is, the hydroxyl group / isocyanate group equivalent ratio (α value) to a predetermined value. As described above, the present invention relates to a mold for the purpose of producing a blade member having an international rubber hardness (IRHD) of 60 ° or more and 90 ° or less.

  The international rubber hardness (IRHD) of the blade member can be a value measured based on JIS K 6253 using a micro hardness tester.

(Blade mold)
Next, a mold for injecting a thermosetting polyurethane resin material and molding a blade member will be described. FIG. 1 shows an example of a mold for molding a blade member, and the example of FIG. 1 is a split mold. FIG. 2 is a cross-sectional view in a state where the split molds illustrated in FIG. 1 are combined. The split mold includes an upper mold 10 for forming one side of the blade member and a lower mold 11 for forming the other side of the blade member.

  In the present invention, a plating layer containing a fluororesin (hereinafter also referred to as a fluororesin-containing plating layer) is formed on at least the inner wall surface of the blade member molding die that is in contact with the blade member. For example, in the example in FIG. 1, a configuration in which a fluororesin-containing plating layer is formed on the inner wall surface 10 a of the upper mold 10 and the inner wall surface 11 a of the lower mold 11 can be used.

  The fluororesin-containing plating layer is a plating layer containing a fluororesin, and includes, for example, a layer in which a chromium plating surface is impregnated with a fluororesin or a fluororesin-containing nickel coating. The layer in which the surface of the chrome plating is impregnated with the fluororesin can be formed, for example, by applying a chrome resin to the surface of the molding die and then applying and baking it. In addition, as the fluororesin-containing nickel coating, for example, a particulate tetrafluoroethylene resin and electroless nickel are co-deposited on the mold surface and baked, so that the electroless nickel and the fluororesin are firmly adhered to each other. Is mentioned.

  Furthermore, in the blade member molding die according to the present invention, the 10-point roughness average (RzJIS) on the mold surface (corresponding to the surface of the fluororesin-containing plating layer in the present invention) is 2 μm or more and 25 μm or less. When the 10-point roughness average (RzJIS) on the mold surface (the surface of the fluororesin-containing plating layer) is less than 2 μm, the contact area between the molded product and the inner wall surface of the mold (the fluororesin-containing plating layer) becomes very large. Therefore, the slip resistance between the two increases. Therefore, the releasability is poor at the time of demolding, sticking occurs, and a blade member with excellent shape accuracy cannot be obtained. When the 10-point roughness average (RzJIS) of the mold surface exceeds 25 μm, the raw material of the blade member enters the surface irregularities, an anchor effect occurs, the releasability at the time of demolding deteriorates, and the shape accuracy is excellent. A blade member cannot be obtained.

  On the other hand, if the 10-point roughness average (RzJIS) of the mold surface is 2 μm or more and 25 μm or less, the cast thermosetting polyurethane resin raw material will enter minute irregularities on the mold surface before curing. The molded product and the mold surface are in contact with each other at a point rather than a surface. Therefore, it is possible to obtain excellent releasability and to obtain a blade member having excellent shape accuracy. Since the blade member which is the manufacturing object of the blade member molding die according to the present invention is in a relatively soft range as described above, the mold surface may be configured to give better mold releasability. desirable. The range of the surface roughness in the present application is a range necessary for that purpose.

  In the present invention, the Vickers hardness of the mold surface (the surface of the fluororesin-containing plating layer) needs to be at least 300 Hv or more. When the Vickers hardness of the mold surface (the surface of the fluororesin-containing plating layer) is less than 300 Hv, the soft fluororesin-containing plating layer follows the blade member when the cast blade member is removed from the mold. For this reason, the force required for demolding increases and the releasability decreases. In addition, if the Vickers hardness of the mold surface is less than 300 Hv, fine scratches are likely to occur with repeated use, and if there are scratches on the mold surface, the molded product will adhere, causing a decrease in releasability. Become. The Vickers hardness of the fluororesin-containing layer varies depending on the content of the fluororesin, and a value of approximately Hv300 can be obtained with a PTFE content of 30% and a PTFE content of 10%. In the present invention, it is assumed that the Vickers hardness of the mold surface is 300 Hv or more, but the upper limit is inevitably determined by the material and manufacturing method obtained at the present time, but it is desirable that the hardness is harder. In the present invention, the hardness of the mold surface (Vickers hardness) is measured based on JIS Z 2244.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples.

  First, the blade member used in the present invention was produced as follows.

<Example 1>
The developer amount regulating blade of the present invention was produced as follows.

  An electrogalvanized steel sheet gin coat 21 (trade name, manufactured by Nippon Steel Corporation) having a non-chromium surface treatment layer containing a urethane-modified olefin resin and an acrylic-modified olefin resin was used as a support member. To this, a film-like hot-melt adhesive L-fan H (trade name, manufactured by Nihon Matai Co., Ltd.) was temporarily bonded.

Next, the following materials were mixed and stirred in a casting machine mixing chamber to obtain a thermosetting polyurethane resin raw material mixture.
・ 100 parts by mass of adipate urethane prepolymer (Mn; 2000, NCO content: 6.25% by mass)
-3.7 parts by weight of 1,4-butanediol-1.9 parts by weight of trimethylolpropane Cast into a mold composed of an upper mold and a lower mold in which the obtained raw material mixture has been heated to 130 ° C in advance. Then, it was demolded after heat curing to obtain a strip-shaped blade member. The international rubber hardness of the obtained blade member was 60 °.

  This blade member and the support sheet metal temporarily bonded with the hot melt adhesive were heated and bonded to obtain a developer amount regulating blade. At this time, no cleaning was performed, and cleaning was performed to such an extent that dust attached to the mold surface was blown off by air blow.

  Moreover, the fluororesin containing plating layer was formed in the metal mold | die surface used for this shaping | molding. A tetrafluoroethylene resin (polytetrafluoroethylene resin) was used as the fluororesin, and a nickel coating containing fine particles of the tetrafluoroethylene resin was formed on the mold surface. By applying a heat treatment (about 400 ° C.) after the coating was formed, the tetrafluoroethylene resin and the nickel coating were firmly adhered. The formation method of this fluororesin-containing plating layer is known as “Nifgrip (registered trademark)” of ULVAC TECHNO. The Vickers hardness of the fluororesin-containing plating layer at this time was 300 Hv. Moreover, the blast process of the metal mold | die surface was performed before forming the layer containing a fluororesin, and the 10-point average roughness (RzJIS) of the surface after layer formation was 2 micrometers. Examples of methods for roughening the mold surface include cutting, polishing, etching, and laser processing.

(Evaluation method of 10-point average roughness (RzJIS))
The ten-point roughness average (RzJIS) of the molding die surface of the blade member was measured based on JIS B 0601 using a surface roughness measuring machine SE3500 (manufactured by Kosaka Laboratory Co., Ltd.).

(Measurement of Vickers hardness)
The Vickers hardness of the mold surface was measured based on JIS Z 2244 using a micro Vickers hardness meter.

(Measurement of international rubber hardness)
The measurement of international rubber hardness (IRHD) was performed based on JIS K 6253 using a Wallace microhardness meter manufactured by Wallace (HW, WALLACE).

(Releasability evaluation method)
The operation of putting the raw material mixture into the molding die maintained at a temperature of 130 ° C., curing and demolding was repeated, and the release durability was evaluated. The releasability when removing the blade member molded at the first time, the 20th time, and the 50th time was evaluated according to the following criteria. The results are shown in Table 1.
(Double-circle): There is no generation | occurrence | production of a chipping, a crack, etc., and a mold release property is favorable.
○: There is no chipping or cracking in the molded product.
Δ: The molded product is chipped or cracked.
X: Tearing due to sticking occurs and release is difficult.

(Image evaluation method)
The produced developer amount regulating blade was incorporated into a cartridge for a laser beam printer LBP3410 (manufactured by Canon Inc.), and image streaks were evaluated according to the following criteria. The results are shown in Table 1.
○: Image streak is not observed Δ: Some image streak was confirmed, but there is no practical problem ×: Image streak is confirmed and practically problematic

<Example 2>
The adipate urethane prepolymer (Mn; 2000, NCO content; 6.25 mass%) in Example 1 was used as the adipate urethane prepolymer (Mn; 2000, NCO content; 7.0 mass%). Otherwise, a developer amount regulating blade was produced in the same manner as in Example 1. Further, in the same manner as in Example 1, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured to evaluate the releasability and image evaluation. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 1.

<Example 3>
The fluorine resin content of the fluororesin-containing plating layer applied to the mold surface in Example 1 was 10%, and the Vickers hardness of the fluororesin-containing plating layer was 750 Hv. Otherwise, a developer amount regulating blade was produced in the same manner as in Example 1. Further, as in Example 1, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured, and the releasability and image evaluation were performed. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 1.

<Example 4>
The blasting conditions applied to the mold surface before the formation of the fluororesin-containing plating layer in Example 1 were changed, and the 10-point average roughness of the mold surface was set to 25 μm. Otherwise, a developer amount regulating blade was produced in the same manner as in Example 1. In addition, the international rubber hardness of the blade member was measured in the same manner as in Example 1, and the releasability and image evaluation were performed. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 1.

<Example 5>
Before forming the fluororesin-containing plating layer in Example 2, the blasting conditions applied to the mold surface were changed, and the 10-point average roughness of the mold surface was 25 μm. Otherwise, a developer amount regulating blade was produced in the same manner as in Example 2. In addition, as in Example 1, the international rubber hardness of the blade member, evaluation of releasability, and image evaluation were performed. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 1.

<Example 6>
The fluororesin-containing plating layer applied to the mold surface in Example 4 had a fluororesin content of 10%, and the fluororesin-containing plating layer had a Vickers hardness of 750 Hv. Others were made in the same manner as in Example 4 to produce a developer amount regulating blade, and in the same way as in Example 2, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured, and the releasability. Evaluation and image evaluation were performed. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 1.

<Comparative Example 1>
A developer amount regulating blade was produced in the same manner as in Example 1 except that the fluororesin-containing plating layer in Example 1 was not provided. Further, in the same manner as in Example 1, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured to evaluate the releasability and image evaluation. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 2.

<Comparative example 2>
A developer amount regulating blade was prepared in the same manner as in Example 1 except that 1,4-butanediol in Example 1 was 3.9 parts by mass and trimethylolpropane was 1.7 parts by mass. Further, in the same manner as in Example 1, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured to evaluate the releasability and image evaluation. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 2.

<Comparative Example 3>
A developer amount regulating blade was prepared in the same manner as in Example 1 except that 3.4 parts by mass of 1,4-butanediol and 2.2 parts by mass of trimethylolpropane in Example 1 were used. Further, in the same manner as in Example 1, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured to evaluate the releasability and image evaluation. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 2.

<Comparative example 4>
The developer amount regulating blade in the same manner as in Example 1 except that the fluorine resin content of the fluororesin-containing plating layer applied to the mold surface in Example 1 is 35% and the Vickers hardness of the mold surface is 200 Hv. Was made. Further, in the same manner as in Example 1, the international rubber hardness of the blade member and the ten-point average roughness (RzJIS) of the mold surface were measured to evaluate the releasability and image evaluation. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 2.

<Comparative Example 5>
A developer amount regulating blade was produced in the same manner as in Example 1 except that the blasting conditions on the mold surface in Example 1 were changed, and the 10-point average roughness of the mold surface was 1 μm. Further, in the same manner as in Example 1, the international rubber hardness of the blade member was measured, and evaluation of releasability and image evaluation were performed. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 2.

<Comparative Example 6>
A developer amount regulating blade was produced in the same manner as in Example 1 except that the blasting conditions on the mold surface in Example 1 were changed, and the 10-point average roughness of the mold surface was 30 μm. Further, in the same manner as in Example 1, the international rubber hardness of the blade member was measured, and evaluation of releasability and image evaluation were performed. Moreover, only the simple cleaning similar to Example 1 was performed. The results are shown in Table 2.

  From the results of Table 1 above, good releasability could be confirmed in the blade member molded in the example. Further, when the obtained developer amount regulating blade was used, no image streak occurred and a good image was obtained.

  On the other hand, in the comparative example of Table 2 above, on the condition that the international rubber hardness is less than 60 ° (Comparative Example 2), the molded product becomes uneven on the mold surface even if the surface roughness is 2 to 25 μm. Since the intrusion and the contact area increased and sticking occurred, vertical streaks were confirmed in the image evaluation. In addition, when the international rubber hardness is over 90 ° (Comparative Example 3), fine chips, cracks, and dents that can be assumed to be caused by local shrinkage or catching at the time of demolding are observed, and vertical streaks are confirmed in image evaluation. It was done.

  When the Vickers hardness of the mold surface (the surface of the fluororesin-containing plating layer) was less than 300 Hv (Comparative Example 4), the sticking of the molded product was gradually confirmed as the number of shots increased.

  Moreover, when the surface roughness of the molding die was less than 2 μm (Comparative Example 5), the releasability was not excellent after the first shot. When the surface roughness was more than 25 μm (Comparative Example 6), the residue of the molded product that had entered the surface irregularities could be confirmed, and the mold release gradually became difficult.

  With respect to a molding die (Comparative Example 1) in which the fluororesin-containing plating layer was not formed, sticking occurred from the first shot, making it difficult to release. Therefore, no examination was conducted after 20 shots. In addition, 50 shots were set as a target for enduring long-term use of the mold.

It is explanatory drawing of the split mold for shape | molding a blade member. It is sectional drawing of the state which tied the split mold.

Explanation of symbols

10 Upper mold of a split mold 11 Lower mold of a split mold 10a 10 inner wall surface formed with a fluororesin-containing plating layer 11a 11 inner wall surface formed with a fluororesin-containing plating layer

Claims (6)

A blade member molding die for molding a blade member mainly composed of a thermosetting polyurethane resin and having an international rubber hardness (IRHD) of 60 ° or more and 90 ° or less,
The surface of the mold has a plating layer containing a fluororesin, the Vickers hardness of the surface of the mold is 300 Hv or more, and the ten-point roughness average (RzJIS) of the surface of the mold is 2 μm or more. A blade member molding die having a thickness of 25 μm or less.   The blade member molding die according to claim 1, wherein the fluororesin is a tetrafluoroethylene resin.   The blade member molding die according to claim 1 or 2, wherein the plating layer is a plating layer made of nickel.   4. The blade member molding die according to claim 1, wherein the plating layer containing the fluororesin is a nickel coating containing fine particles of tetrafluoroethylene resin. 5.   The blade member molding die according to claim 1, wherein the plating layer containing the fluororesin is a layer in which a chromium plating surface is impregnated with a fluororesin. A method of casting a blade member having an international rubber hardness (IRHD) of 60 ° to 90 ° by pouring thermosetting polyurethane resin as a main component into a blade member molding die,
The blade member molding method according to claim 1, wherein the blade member molding die according to claim 1 is used as the die.

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