JP2724306B2 - 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 converting the image, the toner image is transferred to paper supplied from the paper cassette, further the transferred toner image to fix to the paper, heat and pressure to the surface by the heated constant Chakuro over La The mechanism has a mechanism for pressing and fusing the toner image and the paper fiber so that they are not easily separated from each other. However, in the example a final fixing step of such a device, to rotate while paper is heated and pressurized by the constant Chakuro over La is in close contact with the roller surface, very much in danger of causing paper jam, it is essential to smoothly peeled lifting the edge of the paper in close contact with the roller with the separating pawl pressed against the tip surface of the constant Chakuro over La therefor. Accordingly, the separation claw needs to have heat resistance so that the tip does not deform, and at the same time, the radius of curvature of the tip (hereinafter referred to as the tip R) is reduced, and the separation claw has lubricity. and or to prevent the fixing paper (this hereinafter referred to as separating direction failure) separation failure would send a constant Chakuro over la side or paper at the separating claw unit jamming (hereinafter referred to as simply paper jam) It is important. [0005] Further, the surface of the constant Chakuro over La 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 method for coating the tip of the separation claw based on the conventional technique has excellent lubricating properties, non-adhesion, adhesion strength and thin film forming ability. There is no method available, and the obtained separation claw has a problem that undesired phenomena such as thermal deformation, poor separation direction, paper jam, and claw marks often occur. [0012] In order to solve the above problems In order to solve the problems] In the present invention, in partial Hanaretsume manufacturing method you peel the fixing sheet from the constant Chakuro over La, the separation claw On the surface
250 when forming a thin layer of a fluorinated polyether polymer
A heat-resistant polyimide resin that does not thermally deform due to heat treatment at a temperature higher than ℃ is used as the base resin, and this is cut into a separating claw shape and the radius of curvature at the tip of the separating claw is reduced to 0.05 mm or less.
A solution containing a fluorinated polyether polymer dissolved in a solvent is applied to at least the paper passing surface at the leading end of the separation claw , and the solvent
Dried and then high temperature, yet fluorinated than 250 ° C.
Heat treatment at a temperature at which the polyether polymer does not thermally decompose
This is a method for producing a separating claw for a copying machine, which comprises forming a thin layer of a fluorinated polyether polymer . The fluorinated polyether polymer in the present invention is a polymer having lubricity and non-adhesion itself.
In particular radius of curvature 0.05 mm below the tip portion of the sheet passing of such cutting a polymer polyimide resin separation claw
By applying it to the surface and treating it in a predetermined manner, lubricity, non-adhesion , paper jam
Thus, a separation claw exhibiting prevention of image contamination on the paper surface can be obtained. First, the polyimide resin of the present invention is:
A polyimide for cutting that can be used continuously as a fixing paper separating nail material at an ambient temperature of 150 ° C or higher.
Resin, and also of fluorinated polyether polymer
Thermal transformation by heat treatment higher than 250 ° C when forming thin layers
A polyimide resin having heat resistance which does not form a example <br/> words, registered trademark of US DuPont VESPEL-
A polyimide resin which is commercially available as SP. [0015] In one technique, the fluorine used in this invention
The fluorinated polyether polymer is preferably , for example , a fluorinated polyether polymer having at least one polar end group.
In addition, -C _X1 F _2X1 -O- units (where X ₁ is an integer of ₁ to 4) are used as main structural units, and the number average molecular weight is about 1000 to 5
000 polymers, 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 ## The fluorinated polyether polymer having an average molecular weight of about 2,000 which is commercially available under the trademark Fomblin Z-DOL of Montenson, Italy, can be exemplified. The viscosity of the above-mentioned fluorinated polyether polymer is too high to form a thin layer of the fluorinated polyether polymer in order to impart lubricity and non-adhesiveness to the separation nail 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. Therefore, the fluorinated polyether polymer may be dissolved in a highly fluorinated organic solvent such as Freon 113 or another suitable Freon and applied by a suitable method, for example, a spray method or a dipping method. Among these, the dipping method is preferred 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 0.3 to 1 in view of cost.
0% by weight, particularly 0.5 to 3% to obtain an effective thin film.
% By weight. Further, after painting, drying and heat treatment, the surface may be polished with a soft cloth or tissue paper to make the slightly cloudy surface state glossy. This is to remove excess fluorinated polyether polymer. The above-mentioned method, that is, a fluorinated polyether polymer is dissolved at a suitable concentration in a highly fluorinated organic solvent in a separation nail base resin, and a thin layer is formed by a suitable coating method such as dipping. Drying is performed at an appropriate temperature, for example, in a hot air (50 ° C.) drying oven to remove the highly fluorinated organic solvent. It is preferable to perform a heat treatment after the drying or at a higher temperature for the purpose of drying, and also to increase the reactivity between the polar terminal group of the fluorinated polyether and the separated nail base resin. [0028] Even situ min The fluorinated polyether polymer containing solution by dipping the coated surface of the Hanaretsume shape resulting preform, a temperature higher than 250 ° C., for example 270 ° C. or less
Heat-treat at the above high temperature for an appropriate 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] shows a comparative example and our following examples, the mixing ratio of raw materials was expressed in all wt%. Example 1 : Aromatic polyimide resin (VESPE manufactured by DuPont, USA)
L SP-1) Cutting (shaving) from round bar molded products
Produced a test piece and a separation nail. In addition, separation claw
The radius of curvature of the tip is 0.05 mm or less. These test pieces and the separated nail moldings
At least the fluorinated polyether at the leading end
To apply the polymer-containing solution, a test piece was added to a Freon 113 solution in which 1.5% of a fluorinated polyether polymer was dissolved.
And after soaking the separated claw molded product , take them out and
Dried in a hot air drying oven at 0 ° C , and fluorinated
After heat treatment for 24 hours at a temperature at which the reether polymer did not thermally decompose , the lubricity, non-adhesion, and functionality as a separating nail material were evaluated. The fluorinated polyether polymer is represented by the following chemical formula 5.
Italy country Montedjison Co. shown in: Fomblin Z-D
ISOC (number average molecular weight of 2 000) chose. Embedded image It should be noted that lubricating, non-adhesive and separating nail materials
The method of each evaluation for the following functionality is as follows. 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,
Paper separation failure (jam) the number of copies of the event from the constant wearing roller, presence or absence of the toner image contamination caused by scratch, and the toner adhering amount [unattached or trace attached to the separation claw (◎ mark ), A relatively small amount (marked with ○), a small amount (marked with Δ), and a large amount (marked with ×)]. 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. Table 1 shows the obtained results.
Summarized in [Table 1] Comparative Example 1: A test piece was obtained in exactly the same manner as in Example 1 except that a thin layer of the fluorinated polyether polymer was not formed on the surface of the separation nail, and the same measurement was performed. Also described in 1. As is evident from Table 1, the separation claw shown in Example 1 has excellent lubricity, and exhibits a contact angle comparable to that of a single fluororesin even in non-adhesiveness, and is extremely excellent. As a result, the practical functions of the copying machine were sufficiently satisfactory. 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 a separatory Hanaretsume surface still a thin layer of fluorinated polyether polymer is present, a thin layer of fluorinated polyether polymer good adhesion strength and abrasion resistance of the present invention It can be seen that they have [0041] In short separation claw shown in Example 1, lubricity, non-tacky and showed a practical function together very good value, such as the paper supply test. Further, from the results of the contact angle after passing the paper, satisfactory results were obtained with respect to the adhesive strength and abrasion resistance of the thin layer. [0042] Comparative Example 2-8: as a separation claw for the heat-resistant resin, Comparative Examples 2, 3 and 8 fang
Amoco's Tor , an aromatic polyamideimide resin
lon4203 (3% titanium dioxide, 0.5% tetrafluoride
Ethylene resin containing), Comparative Example 4 is an aromatic polyamide-imide resin U.S. Amoco Torlon 4347
(12% graphite, 8% ethylene tetrafluoride resin)
Comparative Example 5 is a polyphenylene sulfide resin.
Asahi Glass Co., Ltd. RE101JA, Comparative Example 6 polyphenylene
Asahi Glass RFG 1530J which is a sulfide resin
A, Comparative Example 7 is an aromatic polyetherketone resin
PEEK-150P and titanium made by ICI of the UK
Tesmo D10 manufactured by Otsuka Chemical Co., Ltd.
1A was melt-blended at a weight ratio of 7: 3. [0043] and these resins are molded out morphism, Comparative Examples 2, 3, 4 and 8 were heat treated for 24 hours at 260 ° C. after molding. Further, Comparative Examples 3 and 5 are polyfluorocarbon tough coat enamels TC7105GN and TC-7 manufactured by Daikin Industries, which are fluororesin-containing resin enamels.
409BK is uniformly coated with a suction spray gun to a film thickness of about 30 μm, and dried at 100 ° C. for 30 minutes. Further, Comparative Example 3, TC7105GN, is heated at 250 ° C. for 30 minutes, and Comparative Example 5, TC740
9BK was heat-treated at 180 ° C. for 30 minutes. In Comparative Example 8, after heat treatment, Fomblin Z-25 (a viscosity of 20 ° C. 250
cst) was immersed in a solution of 1.5% dissolved in Freon R113, taken out and dried at 50 ° C. Performs test using these specimens, and the results are shown in Table 2. [Table 2] As is clear from Table 2 , the nails having no coating on the surface of the separated nails, ie, Comparative Examples 2, 4, 6 and 7, had poor lubricity and non-adhesiveness, and showed good results in the actual machine test. Could not be obtained. Further, even in the case where a coating is formed on the nail surface, as in Comparative Examples 3 and 5, an increase in the tip R due to a thick film of 30 μm causes poor separation due to insufficient lubricating properties, and non-separation occurs. Insufficient adhesiveness causes nail marks and increases the amount of adhered toner. Even when a thin layer of a fluorinated polyether polymer is formed on the nail surface as in Comparative Example 8, the lubricity and non-adhesiveness before the test are very good, but the polar group As a result, the adhesive strength between the thin layer and the base material was poor, and it was peeled off during the paper passing test, resulting in a poor result. This is judged by a large decrease in the contact angle after the test. As is apparent from the above description, the method for producing a separating claw for a copying machine according to the present invention is excellent in both lubricity and non-adhesiveness, improving the adhesion strength between the coating layer and the substrate, and improving the coating. The thickness of the layer and the type of substrate and the radius of curvature of the tip are 0.05 m
m or less, without causing poor separation direction due to an increase in the tip R of the separation claw tip , paper jam and thermal deformation , which are disadvantages of the conventional coating technology,
Another advantage is that a separating claw for a copying machine can be provided which can sufficiently withstand long-term continuous use without impairing heat conductivity and electric conductivity. Also, a thin layer of a fluorinated polyether polymer
Thermal deformation at a heat treatment temperature higher than 250 ° C when providing
Polyimide resin separation claw with extremely high heat resistance
25% after application and drying of the fluorinated polyether polymer
Fluorinated polyether polymerization at a temperature higher than 0 ° C
Heat treatment at a temperature at which the body does not thermally decompose.
Separation of thin layer with excellent non-adhesion without reducing shape accuracy
It can be formed on the paper passing surface of at least the tip of the nail,
Adhesion of toner, poor separation direction, paper jam and fusing toner
This also prevents image contamination on the paper surface, such as paper stains caused by paper.

Claims (1)

(57) In Claims (1) minute Hanaretsume manufacturing method you peel the fixing sheet from the constant Chakuro over la, a thin layer of fluorinated polyether polymer separation claw surfacing
Resistant to thermal deformation due to heat treatment at temperatures higher than 250 ° C
Febrile polyimide resin as the matrix resin, after which the molded radius of curvature of the cutting and partial Hanaretsume tip separation claw shape below 0.05 mm, soluble in passing surface of at least the tip portion of the separation claw
A solution containing a fluorinated polyether polymer dissolved in a medium is applied, the solvent is dried, and then at a temperature higher than 250 ° C.
In addition , heat treatment at a temperature at which the fluorinated polyether polymer does not thermally decompose forms a thin layer of the fluorinated polyether polymer
A method for manufacturing a separation claw for a copying machine.