JP2829291B2 - Method of manufacturing separation claw for copying machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a separating claw for a copying machine. 2. Description of the Related Art A dry-type copying machine, which has undergone rapid progress and development with the socialization of information, uses an electrostatic latent image formed on the surface of a photosensitive drum corresponding to characters, figures, etc. of a document as a toner. After the toner image is converted into an image, the toner image is transferred to the paper surface supplied from the paper supply cassette, and the surface is heated and pressed by a heated fixing roller to fix the transferred toner image on the paper surface. It has a mechanism for fusing the image and the paper fibers so that they do not separate easily. However, in such a device, for example, in the final fixing step, the paper heated and pressed by the fixing roller rotates while keeping in close contact with the roller surface, and there is a great risk of causing paper jams. It is important to lift the edge of the paper that is in close contact with the roller by using a separation claw whose tip is pressed against the surface of the roller to smoothly separate it. Therefore, it is natural that the separation claw needs to have heat resistance so that the tip does not deform, but at the same time, the radius of curvature of the tip (hereinafter, abbreviated as the tip R).
Or the separation claw has lubricating properties to send the fixing paper to the fixing roller side (hereinafter referred to as separation direction failure) or a paper jam at the separation claw (hereinafter referred to as this). Is simply called a paper jam). Further, the surface of the fixing roller is 170-27.
Since the temperature rises to 0 ° C., the toner adhered to the paper fuses to the separation claw, and if the amount increases, the fused toner may cause paper jam or cause the toner adhering to the paper to be scraped off. In many cases, white streaks (hereinafter referred to as nail marks) are formed in the toner fixing portion of the toner, so that the separating nails must be non-adhesive to the toner in order to avoid this. [0006] In order to satisfy the conditions to be met by such a separating claw, conventionally, polyimide, polyamideimide, polyarylene sulfide, aromatic polyetherketone, aromatic polysulfone, aromatic polyetherimide, aromatic polyamide, aromatic polyamide, Resins such as polyester or those obtained by mixing such resins with fluororesins such as tetrafluoroethylene resin or graphite or other solid lubricants. Further, for example, Japanese Utility Model Publication No. 54-18921,
As disclosed in JP-A-1111569, a resin in which the surface of a resin as described above is coated with a fluorine-containing polymer to improve lubricity and non-adhesion has been put to practical use. [0007] However, the separation claw whose surface is not coated with a fluorine-containing polymer has insufficient lubricity and non-adhesiveness even if mixed with a fluororesin or a solid lubricant, so that paper jamming occurs. Even with separation nails that cause the problem of nail marks and that have a surface coated with a fluorine-containing polymer, both the expected lubricity and anti-adhesion are insufficient, and long-term continuous use or depending on the type of toner, paper The problem of jamming and nail marks occurs as in the case described above. In general, the thickness of the coating film at the tip of the separation claw is 30 μm on average in order to exhibit lubricating and non-adhesive effects.
Since at least 10 μm or more is required, the tip R of the separation claw formed to have a small angle by coating is large, and a separation direction defect, paper jam, and the like are likely to occur. Therefore, in order to prevent the tip R of the separation claw from increasing due to the thickness of the coating film, a measure may be taken to reduce the tip R in consideration of the film thickness when forming the separation claw. However, in such a treatment, the tip is naturally susceptible to thermal deformation, not only lowering the usable temperature, but also the resin-made separation claw body and the fluorine-containing polymer are not usually firmly bonded. Therefore, interface peeling of the coating film easily occurs, and in order to coat the fluorine-containing polymer, a method of coating a fluorine-containing polymer dispersed in a polar solvent to about 20 to 40 μm by spraying is usually adopted. In addition, there are many problems, for example, since the splash is scattered around the separation claw, the product yield is reduced, and the cost is very high. There is also an attempt to form a thin film of silicone oil on the surface of the separation claw by, for example, a dipping method so as to exhibit lubricity and non-adhesiveness. Long-term maintenance is not possible. As described above, the tip coating of the separation claw based on the prior art has lubricating properties, non-adhesiveness,
None of them are excellent in all aspects of adhesion strength and thin film forming ability, and there is a problem that undesired phenomena such as thermal deformation, poor separation direction, paper jam, and nail marks often occur. [0012] In order to solve the above problems In order to solve the problems] In the present invention, the process for producing an aromatic polyester resin separation claw for separating the fixing sheet from the fixing unit roller, the separation Fluorinated polyether polymer on nail surface
Heat treatment at a temperature higher than 250 ° C when forming a layer of
Aromatic plastics with heat resistance and injection molding that do not form
The polyester resin is used as the base material resin,
And make the radius of curvature at the tip of the separation claw less than 0.05mm.
After shaping, apply fluorine to at least the tip
A solution containing the functionalized polyether polymer, and dry the solution.
Dry and hot above 250 ° C and fluorinated polyether
Heat treatment at a temperature at which the polymer does not thermally decompose
Of producing separation claw for copying machine forming layer of polyester polymer
It was. [0013] [action] fluorinated polyether polymer in the present invention, per se lubricity, since it is capable of forming a polymer der Ru layer <br/> having a non-tacky, such heavy Even if the coalescing is applied to the separation claw, particularly at the tip, it does not increase the good tip R, and exhibits lubricity and non-adhesion. DESCRIPTION OF THE PREFERRED EMBODIMENTS The aromatic polyester resin of the present invention has a mechanical strength that can be continuously used as a fixing paper separating claw and can be injection-molded at an ambient temperature of 150 ° C. or more. A synthetic resin such as an aromatic polyester resin commercially available as EKONOL, a registered trademark of Carborundum. Next, the fluorinated polyether polymer having at least one polar terminal group used in the present invention is, for example, a —C _X1 F _2X1 —O— unit (provided that X ₁
Is an integer of 1 to 4), and is a polymer having a number average molecular weight of about 1,000 to 5,000, for example, ## STR2 ## and particularly preferably, ## STR2 ## A fluorinated polyether polymer having an average molecular weight of about 2000, which is commercially available under the trademark Fomblin Z-DISOC (registered trademark of Montenson, Italy) and represented by the following formula: ## STR3 ## A fluorinated polyether polymer having an average molecular weight of about 2000, which is commercially available under the trademark Fomblin Z-DEAL (registered trademark of Montenson, Italy) and represented by the following formula: ## STR4 ## And a fluorinated polyether polymer having an average molecular weight of about 2000, which is commercially available under the trademark Fomblin Z-DOL of Montenson, Italy. The viscosity of the fluorinated polyether polymer is too high to form a thin film of the fluorinated polyether polymer in order to impart lubricity and non-adhesiveness to the separation claw for a copying machine. For example, Fomblin Z-DOL200
0 at a temperature of 20 ° C. is about 80 cst.
nZ-DEAL2000 has a viscosity of about 20c at 20 ° C.
st. Fluorinated polyether polymer is chlorofluorocarbon 11
It may be dissolved in a highly fluorinated organic solvent such as 3 and applied by an appropriate method, for example, a spraying method or a dipping method, but the dipping method is preferable. This is because the yield of the coating liquid is very good. The concentration of the fluorinated polyether polymer dissolved in the highly fluorinated organic solvent is not particularly limited. However, considering the cost, it is preferably about 0.3 to 10% by weight to obtain a particularly effective thin film. For this purpose, the content is preferably about 0.5 to 3% by weight. Further, after painting and drying, the surface is polished with a soft cloth or tissue paper, etc., and the slightly cloudy surface state is made glossy. This is to remove excess fluorinated polyether polymer. The above-mentioned method, that is, a fluorinated polyether polymer is dissolved in an appropriate concentration of a highly fluorinated organic solvent in a base resin of a separated nail, and a coating is formed by an appropriate coating method such as dipping. Dry at an appropriate temperature, for example, in a hot air (50 ° C.) drying oven to remove the fluorinated organic solvent. The treatment may be carried out at a higher temperature after or also for the drying, and it is preferable in view of the possibility of increasing the reactivity between the polar terminal group of the fluorinated polyether and the resin of the separated nail matrix. For example, the solution containing the fluorinated polyether polymer is applied by dipping to the surface of a base material having a separated claw shape obtained by injection molding, and the temperature is higher than 250 ° C., for example, 270 ° C. or higher. For a suitable time. Here, the high temperature refers to a temperature at which the base resin and the fluorinated polyether do not thermally deform or thermally decompose. [0029] In the following, shows the real施例and comparative examples. Example 1 Aromatic polyester resin as a heat-resistant resin for separating nails
(Ekonol, manufactured by Carborundum, USA) was used.
The radius of curvature (tip R) at the tip of the separation claw is 0.05 mm or less
It is. Then, the mixture was mixed with a Henschel mixer, kneaded with a twin screw extruder, and extruded. The strand was cut to obtain pellets. The pellets were injection-molded to obtain a separated claw-shaped molded product and a friction test piece. The chosen fluorinated polyether polymer as the next Indonesian Montedjison Inc. products (number-average molecular weight of 000). That is , Fomblin represented by the following Chemical Formula 5
Z-Diso using C, full Tsu fluorinated each polyether polymer immersed in Freon 113 solution of 1.5%, taken out and applied to the sheet passing surface of at least the tip portion of the separation claw 50 to a heat treatment after coating After performing in a hot-air drying furnace at a temperature of at least 0 ° C. and then drying and heat-treating at 260 ° C. for 24 hours, lubricity, non-adhesiveness, and functionality as a separation nail material were evaluated . Embedded image Lubricity: Using a thrust type friction tester, load 1 kg / c
The bearing steel (SUJ2) was tested under the conditions of m ² and a speed of 1 cm / sec. Non-adhesion: The contact angle between water and acetic acid was determined using a goniometer-type contact angle tester manufactured by Elma Optical Co., Ltd. using the separation nail as a test piece. Functionality as Separating Claw: Using a dry copying machine Z-60, manufactured by Sharp Corporation, a test piece having the same shape as the separating claw of the same type was attached in a fixed position, and 50,000 sheets of A4 size copy paper were continuously passed. Paper and repeat 50,000 times,
Number of copies at the time of paper separation failure (paper jam) from the fixing roller, presence or absence of toner image contamination due to claw marks, amount of toner attached to separation claw [No or small amount of toner attached, relatively small amount Adhering, attaching a small amount, attaching a large amount]. Further, the toner adhered to the separation nail after the paper passing test was wiped off with ethyl alcohol, and then the contact angles with water and acetic acid were measured. [0036] Comparative Example 1: except that a coating film of a fluorinated polyether polymer was not formed in the separation claw surface to obtain a test piece in exactly the same manner as in Example 1, the same measurement lines Tsu Na . The separation claw of Example 1 has excellent lubricity, exhibits a contact angle comparable to that of a fluororesin alone even when non-adhesive, and is very excellent. It was a satisfactory result. Further, the contact angle of the paper passing surface after the test also showed a large value similar to that before the test, and there was a large difference from the contact angle of Comparative Example 1. This indicates that after the test to the minute Hanaretsume surface still fluorinated polyether polymer film are present, the fluorinated polyether polymer coating of this invention have good adhesion strength and abrasion resistance You can see that there is. As is evident from the above, the method for producing a separating claw for a copying machine according to the present invention has excellent lubricity and non-adhesiveness, improves the adhesion strength between the coating layer and the base material, and improves the coating performance. thinning the layer <br/> and substrate type and the tip curvature radius 0.0
By precision injection molding of 5 mm or less, it does not cause poor separation direction due to an increase in the tip R of the separation claw, paper jam and thermal deformation , which are disadvantages of the conventional coating technique, and also has thermal conductivity and electric conductivity. that the conductivity can be produced for a copying machine separation claw which can sufficiently withstand long-term continuous use without impairing
There are advantages. Further , the layer of the fluorinated polyether polymer is
Do not thermally deform at heat treatment temperature higher than 250 ° C when providing
Aroma with extremely high heat resistance and capable of injection molding
Fluorinated polyether on separation nail made of aromatic polyester resin
Temperature higher than 250 ° C after application and drying of polymer containing solution
And the fluorinated polyether polymer does not thermally decompose
Heat treatment at temperature reduces accuracy of tip shape of separation claw
Separate the layer with excellent non-adhesion without causing at least the tip of the nail
It can be formed on the sheet passing surface of the parts, with the toner adhesion or separation
Poor orientation, paper jam, paper stain due to fusing toner, etc.
Image contamination on the paper surface can be prevented.

Claims (1)

(57) [Claims] (1) In a method of manufacturing an aromatic polyester resin separation claw for peeling a fixing paper from a fixing unit roller, a method for forming a fluorinated polyether polymer layer on the separation claw surface An aromatic polyester resin having heat resistance that does not cause thermal deformation by heat treatment at a temperature higher than 250 ° C. and that can be injection-molded is used as a base material resin. After molding to a thickness of at most 0.05 mm, a solution containing a fluorinated polyether polymer was applied to at least the leading end of the separation claw, and the solution was dried at 250 ° C.
A method for producing a layer of a fluorinated polyether polymer by performing a heat treatment at a temperature higher than the temperature and at a temperature at which the fluorinated polyether polymer does not thermally decompose. (2) The method according to claim 1, wherein the fluorinated polyether polymer-containing solution is a solution-type fluorinated polyether polymer dissolved in a solvent. (3) The method according to claim 1, wherein the separating claw for a copying machine is a separating claw for a dry copying machine.