CN1283368C - Coating method, paper feed roller making method, feed rollers and coating apparatus - Google Patents

Coating method, paper feed roller making method, feed rollers and coating apparatus Download PDF

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Publication number
CN1283368C
CN1283368C CN 01123464 CN01123464A CN1283368C CN 1283368 C CN1283368 C CN 1283368C CN 01123464 CN01123464 CN 01123464 CN 01123464 A CN01123464 A CN 01123464A CN 1283368 C CN1283368 C CN 1283368C
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China
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powder
core material
powder coated
mist
cloud
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CN1334148A (en
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富田充彦
福永浩之
米永伸之
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Inoac Corp
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Inoac Corp
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Priority claimed from JP2000224115A external-priority patent/JP3889208B2/en
Priority claimed from JP2000348312A external-priority patent/JP4647082B2/en
Priority claimed from JP2000349760A external-priority patent/JP4729166B2/en
Application filed by Inoac Corp filed Critical Inoac Corp
Publication of CN1334148A publication Critical patent/CN1334148A/en
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  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

To provide a manufacturing method for a paper conveying roller. Powder coating 21 is made to adhere to a core material 31 by electrostatic force by an electric field flowing powder coater 1 or the like, projection forming powder 22 is made to adhere by electrostatic force. After that, the resin is solidified to form a resin layer, and the projection forming powder is fixed to the resin layer. The roller may be similarly manufactured by making the projection forming powder adhere to the core material and then making the powder coating adhere thereto. As the powder material, the material composed of epoxy resin, unsaturated polyester resin, acrylic resin and the like can be used. As the projection forming powder, in addition to ceramic powder such as alumina, amorphous silica powder, nickel powder and the like can be used.

Description

Method, feed rollers and the coating apparatus of coating process, manufacturing feed rollers
Background technology of the present invention
1. technical field of the present invention
The feed rollers and the powder coated equipment of electric field fluid that the present invention relates to coating process, make the method for feed rollers, make by this method.
2. description of related art
Up to now, in multiple coating process, adopted the fluid impregnated coating.But, need a kind of like this method of more excellent stable high yield, so that feed rollers more can be according to the diversity of workpiece at material, thickness etc., high accuracy work under the mobile situation that can not tilt.
Be developed as feed rollers (hereinafter to be referred as " roller ") with the roller that improves carrying capacity etc. the surface that contacts with paper being given specific function as paper feeding.In this class roller, by be arranged on resin bed on the metallic core material surface etc. fixedly ceramic powders etc. so that on this surface, form the performance that the rollers of a large amount of projectioies have multiple excellence.
For example, JP-A-7-53084 has disclosed a kind of roller by the following steps preparation: coating sex change silicone on the coatings such as rubber that are formed on the core material; The powder of ceramic particle etc. is fixed on the coating surface.But this roller needs a step of removing superfluous deposition part in superfluous coated portion in the sex change silicone or the ceramic particle.Therefore, the problem that has complicated operation and a large amount of steps of needs.
On the other hand, JP-A-10-120234 has disclosed the roller of being made by following steps: the coating material that will contain ceramic particle is sprayed directly on on the core material; Make the coating material drying.Roller can be made by particle being mixed with coating material and by spray gun etc. this mixture being sprayed onto on the core material.But, ceramic particle may be in the nozzle of spray gun, container etc. deposition.On the other hand, a kind of method that may further comprise the steps is arranged: coating material is sprayed onto on the core material; Make the ceramic particle deposition before sclerosis or before the curing after the fusing thereon.Yet in this method, its danger is, and is if a large amount of particles is deposited on the coated film in its sclerosis or before solidifying, inhomogeneous at the particle that coated film flows.
Adopt static that powder or coating material etc. is deposited to method on the workpiece though disclosed in JP-A-7-171485 etc., any method directly can not be migrated is the manufacturing feed rollers.
Summary of the invention
The problem of mentioning in order to solve in background technology, an object of the present invention is to provide a kind of method of making feed rollers, in the method, can make and convex to form powder and be deposited on the core material equably vertically and radially, and provide a kind of feed rollers, it is identical with radially structure vertically, and has stable paper feeding power, therefore convexes to form powder and in use can not come off.
Another object of the present invention is to produce a kind of coated film, and this coated film can be stabilized formation securely on surface of the work when using the fluid dip-coating method.
A further object of the invention is to provide a kind of electric field fluid powder coated equipment, and it comprises and being used under a plurality of formation conditions, at the inner device that forms the many places cloud and mist of fluid container.
To achieve these goals, provide a kind of method of making feed rollers, may further comprise the steps:
With powder coated material by electrostatic applications to core material, deposit the core material of powder coated material with formation;
Deposit on the core material of powder coated material to this by electrostatic applications with convexing to form powder; And
Cure core material, convex to form the fixing resin bed of powder to be formed for making.
In addition, provide a kind of electric field fluid powder coated equipment, having comprised:
One fluid container; And
Be used for and put into fluid container with under multiple formation condition by the various powders that different materials is made, at the inner device that forms the many places cloud and mist of fluid container.
In addition, provide a kind of coating process, it may further comprise the steps:
Turning of work piece in the fluid container that forms the cloud and mist that contains powder coated material at least; And
Powder coated material is deposited on the surface of workpiece.
Brief description of drawings
Fig. 1 is the cutaway view that schematically demonstrates the powder coated equipment of electric field fluid of the feed rollers of making first embodiment of the invention.
The cutaway view that Fig. 2 carries out paper feeding for the feed rollers that demonstrates the employing first embodiment of the invention typically.
Fig. 3 is used to measure the exemplary view of frictional force with the equipment of calculating stiction coefficient for schematically demonstrating.
Fig. 4 is the cutaway view of the powder coated machine that demonstrates the powder coated equipment of electric field fluid that is used for making feed rollers in second embodiment of the invention typically.
Fig. 5 makes the typical top view of the powder coated machine of feed rollers for being used to of using in second embodiment of the invention.
Fig. 6 is for to be provided with under the situation of powder coated part at three places, the typical top view of powder coated machine.
Fig. 7 A is the side view of an example that is used to illustrate the method for rotational workpieces; Fig. 7 B is an a third embodiment in accordance with the invention, is used to illustrate the front view of this example.
Fig. 8 A is an a third embodiment in accordance with the invention, is used to illustrate the side view of another embodiment of the method for rotational workpieces; Fig. 8 B is an a third embodiment in accordance with the invention, is used to illustrate the front view of this example.
Fig. 9 A is an a third embodiment in accordance with the invention, is used to illustrate the side view of another embodiment of the method for rotational workpieces; Fig. 9 B is an a third embodiment in accordance with the invention, is used to illustrate the front view of this example.
Figure 10 has shown a third embodiment in accordance with the invention, the electrostatic fluid dipping system that uses in example 1.
Figure 11 has shown a third embodiment in accordance with the invention, the electrostatic fluid dipping system that uses in example 2.
Figure 12 has shown a third embodiment in accordance with the invention, the electrostatic fluid dipping system that uses in example 3.
Detailed description of the present invention
First embodiment
To describe the first embodiment of the present invention below.
According to the present invention, a kind of method of producing feed rollers is provided, may further comprise the steps: the core material that powder coated material electrostatic applications is deposited powder coated material to the core material with formation; Be applied on this core material that deposits coating material convexing to form powder static electricity; Cure core material, to be formed for having fixed the resin bed that convexes to form powder.
In the method for the invention, can adopt with top identical mode and make feed rollers, its difference is: convexing to form after powder is deposited on the core material deposited powder coating material.
The manufacturing of feed rollers in the method for the invention can be undertaken by the powder coated method of electric field fluid of the present invention.
That is to say, according to the 3rd invention scheme, a kind of method of making feed rollers is provided, and it may further comprise the steps: core material is immersed in the cloud and mist of powder coated material, and powder coated material electrostatic applications is deposited the core material of powder coated material to the core material with formation; The core material that deposits powder immersed convex to form in the cloud and mist of powder, and will convex to form powder static electricity and be applied on the core material that deposits powder coated material; Cure core material, form a resin bed to form powder by fixed lobe.
In the method for the invention, can adopt with top identical mode and make feed rollers, its difference is: will convex to form powder deposition after on the core material, the deposited powder coating material.
Aforementioned " core material " had no particular limits on kind, be recharged can make powder coated material and to convex to form powder deposition characteristic thereon as long as this core material has enough mechanical strengths and has the whole surface that can make core material.Preferably conduct electricity on the surface of core material at least.The example of operable core material can comprise the core material of electroplating automatic steel etc., and the core material of aluminium alloy, stainless steel etc. is electroplated with the core material of resin base material with conductive characteristic etc.In addition, can on the surface of core material, prime coat be set, core material be electroplated so that can be easy to.In addition, can on the surface of core material, form foamed resin layer etc. to improve its pliability.Core material can be solid or hollow.
Can adopt any material as above-mentioned " powder coated material ", as long as this material can be electrostatically deposit onto on the core material or deposit on the core material that convexes to form powder, and contain and by the resin of thermmohardening or to melt the resin that the back can be solidified again along with decrease of temperature.Aforesaid " resin bed " by making hardening of resin or be solidified to form, and fully firmly fixed (below contain the fixing resin bed that convexes to form powder be called as " lobed resin bed ") thereby convex to form powder.Average grain diameter in powder coated material is preferably 5-250 μ m, is preferably 20-50 μ m especially, is more preferably 30-50 μ m.If this average grain diameter often can not be fixing fully with convexing to form powder less than 5 μ m.Have the projection of enough height if this average grain diameter greater than 250 μ m, then often can not form on the surface of resin bed, thereby can reduce defeated paper power.
As powder coated material, can use and contain thermosetting resin or thermoplastic resin powder coated material as main component.The example of thermosetting resin comprises epoxy resin, unsaturated polyester resin, acrylic resin, fluororesin, phenolic resin, melmac, polyurethane resin, silicones etc.Particularly preferably be glycidol ether type epoxy, acrylic resin etc.The example of thermoplastic resin can comprise saturated mylar, the olefin resin as polyethylene or polypropylene, vinyl chloride resin, acrylonitrile-butadiene-styrene copolymer resin etc.Particularly preferably be saturated mylar etc.Powder coated material may only contain a kind of component that is selected from above-mentioned thermosetting resin or thermoplastic resin, maybe can contain two or more components.
As powder coated material, contain as the epoxy powder of main component and be preferred as the material of the polyester resin powder that contains carboxyl of curing agent.As epoxy powder, glycidol ether type epoxy powder is particularly preferred.When using this powder coated material, the thickness of resin bed is easy to evenly, and the powder of fixed lobe formation more firmly.
As aforesaid " convexing to form powder ", can use any material, as long as this material can be electrostatically deposit onto core material or deposit on it on core material of powder coated material.Convexing to form powder preferably selects according to the kind of the paper that will carry.For example when the paper of the projection that is easy to wear and tear in conveying is transferred, the preferred use by what hardness height such as aluminium oxide, carborundum, iron oxide, chromium oxide, cerium oxide, titanium oxide and mar proof excellent material constituted convexes to form powder.Except these materials,, can adopt amorphous silica powder, mullite, carbide, the metal dust as nickel by powder or iron powder etc. as convexing to form powder.As convexing to form powder, can from these materials, select a kind of material as convexing to form powder, perhaps can be used in combination and from these materials, select two or more materials.
According to the present invention, convexing to form powder is under the situation about being made of inorganic material powders, in general, the average grain diameter that convexes to form powder preferably in the scope of 5 to 250 μ m (in the scope particularly preferably in 10 to 120 μ m, more in the scope particularly preferably in 30 to 50 μ m).If less than 5 μ m, then there is the trend that is difficult to form enough coarse pressure layer in average grain diameter.If greater than 250 μ m, then existing, average grain diameter is difficult on the surface of core material, fix/keeps convexing to form the trend of powder.Especially when conducts such as adopting aluminium oxide, iron oxide, chromium oxide, cerium oxide, titanium oxide convexed to form powder, the average grain diameter size was preferably selected in the scope of 15 to 80 μ m.When conducts such as adopting amorphous silica, mullite, carbide, metal dust convexed to form powder, the average grain diameter size was preferably selected in the scope of 30 to 110 μ m.
Average grain diameter size (the D of powder coated material D) and convex to form the average grain diameter size (D of powder f) ratio (D D/ D f) preferably in 0.3 to 0.7 scope, in 0.4 to 0.5 scope.Work as D D/ D fIn the time of in this scope, for paper sheet delivery, roller can form the frictional force with appropriateness.If D D/ D fBe lower than 0.3, then convex to form powder and just can not be firmly fixed, thereby it may come off.Otherwise, if D D/ D fBe higher than 0.7, then formed thicker resin film on the surface of powder convexing to form, thereby reduced frictional force.As a result, may undesirably destroy stable paper sheet delivery.
According to the present invention, be when constituting when convexing to form powder by short fiber, the size of short fiber is preferably 0.1 in the scope of 100D, particularly preferably in 1 in the scope of 50D, more particularly preferably in 10 in the scope of 30D.The length of short fiber is preferably in the scope of 50 to 1200 μ m, in the scope particularly preferably in 300 to 900 μ m, more in the scope particularly preferably in 450 to 750 μ m.Can preferably adopt nylon fiber etc. as short fiber.Same is in the situation about being made of above-mentioned short fiber convexing to form powder, and the carrying capacity of preferably considering roller waits suitably selects the average grain diameter of powder coated material with respect to the short fiber size.
According to the present invention, when the powder coated material of 100 parts by weight (below be abbreviated as " part ") will be provided, the amount that convexes to form powder is preferably in 5 to 250 parts scope, in 10 to 200 parts scope, more particularly preferably in 50 to 150 parts the scope.If the amount that convexes to form powder, then is formed on the quantity minimizing of the projection on the roller less than 5 parts, thereby often can not obtain being enough to the frictional force of conveyance of sheets.Otherwise, can come off if the quantity that convexes to form powder, then in use convexes to form powder greater than 250 parts because convex to form the quantity of powder can surpass convex to form powder can be by the abundant upper limit of fixing scope of powder coated material.In general, thickness is selected in the scope of 10 to 500 μ m, preferably in the scope of 15 to 120 μ m.
In general, at powder coated material or convex to form when powder is recharged simultaneously core material ground connection, because at core material and powder coated material or convex to form the electrical potential difference that occurs between the powder, so can produce above-mentioned " electrostatic force ".When making powder coated material or convex to form powder by high pressure can be applied to powder coated material or convex to form nozzle on the powder etc. the time, powder coated material or convex to form powder and be recharged.Then, powder coated material or convex to form powder and be blown on the core material of ground connection or deposited powder coated material on it or convex to form on the core material of powder is so that can make powder coated material or convex to form powder deposition on core material.By the way, there is following situation, promptly when powder coated material or convex to form the dielectric constant of powder when higher, powder coated material or convex to form powder and can be just be recharged by the friction that occurs at powder coated material or when convexing to form powder by nozzle etc.
When according to the present invention, with the powder coated material of immersions such as core material or convex to form in the cloud and mist of powder, can adopt the powder coated equipment of electric field fluid as shown in Figure 1 so that make powder coated material or convex to form powder deposition on core material the time.In this equipment, powder coated material or convex to form powder it can be recharged by charged pin 4 or when it is contacted with charged pin.This charged pin can be with powder coated material and the porous charging panel that convexes to form the band through hole that powder can pass through replace.Similar to the situation of charged pin, powder coated material or convex to form powder can be by this with the charging of the porous charging panel of through hole.That is to say, powder coated material or convex to form powder can be when it passes the exchange hole of charging panel or when it contacts with wall of exchange hole etc., be recharged.
The volume of the fluid container in the powder coated equipment of electric field fluid, shape, material etc. have no particular limits.Above-mentioned " cloud and mist " that in fluid container, forms thus refer to even dispersion as the floating powder coated material of cloud and mist or convex to form powder.This cloud and mist can be blown into gas in the bottom from fluid container and for example form during air, powder coated like this material or convex to form powder will be evenly floating under the effect of uprising gas.Powder coated material or convex to form powder at the effect float downward of ascending air and floating in the position of buoyancy and its gravitational equilibrium.Therefore just formed cloud and mist.For example, in the powder coated equipment of electric field fluid as shown in Figure 1, with powder coated material 21 or convex to form powder 22 and be placed on the base plate 12 of bottom of this equipment, and by air blast 15 air etc. is blown in the fluid container, air just blows out to the top of fluid container from first and second discharge pipes 141 and 142 like this.Cloud and mist just can form under the effect of this air-flow.
This equipment is not limited to the specific embodiment shown in Fig. 1.First and second discharge pipes 141 and 142 can be arranged on any position, and needing only powder coated material or convex to form powder can be by dispersion and floating equably.Base plate 12 can be by not allowing powder coated material or convex to form that powder passes but the porous membrane that can allow air etc. pass waits and replaces.In this case, air etc. can be from the circulation of the lower surface of porous membrane, so that powder coated material or convex to form flow of powder, thereby form cloud and mist.
By the way, by powder coated material or convex to form bulk density that the bulk density of powder represents preferably 0.1 to 10g/cm 3Scope in, particularly preferably in 0.3 to 3.0g/cm 3Scope in, more particularly preferably in 0.7 to 1.5g/cm 3Scope in.If bulk density is lower than 0.1g/cm 3, then the thickness of lobed resin bed can be not enough.On the other hand, bulk density may be greater than 10g/cm 3, but often can not form uniform cloud and mist.
Feed rollers of the present invention is to make by any method in the said method in according to the present invention, and wherein the cylindricity of this feed rollers is not more than 10 μ m.
In this feed rollers, lobed resin bed is the same sex vertically.And the cylindricity that calculates according to following formula is not more than 10 μ m, especially is not more than 5 μ m.That is, the variation of feed rollers size is very little, and has enough carrying capacitys, carries various paper so that feed rollers can be used in.
Cylindricity (μ m)=(maximum of external diameter)-(minimum of a value of external diameter)
When adopting above-mentioned " feed rollers " as shown in Figure 2 conveying equipment a part of, can conveyance of sheets 5.That is, when making the feed rollers 3 that is equipped with lobed resin bed and rotating without any the driven roller 4 of lobed resin bed that paper 5 is sandwiched between two rollers 3 and 4 simultaneously, can conveyance of sheets 5.Feed rollers 3 has by convexing to form the projection 33 that powder constitutes, and the described powder that convexes to form is fixing by resin bed 32, and described resin bed is by making powder coated material sclerosis or by powder coated material is solidified to form after fusion.Paper can effectively and reposefully be transferred by projection 33.By the way, the example of paper not only comprises various paper, for example normal paper, recycled paper, resin impregnated paper, heat-transferring printing paper, art paper, glossy paper, banks etc. also comprise non-stationery sheet material or film, the projecting apparatus sheet of for example putting on the shelf, gloss film, laminated film etc.
According to the first embodiment of the present invention, powder coated material and convex to form powder and be deposited on the circumferential surface of core material by static is so that accurately make the thickness of lobed resin bed equably.Therefore, improved the accuracy of the centering of roller, thereby can prevent from when conveyance of sheets, to occur tilting to move.And, in the powder coated method of electric field fluid, unnecessary powder coated material and unnecessary convex to form that powder can be recovered and recycling.And, can produce feed rollers, though this feed rollers is difficult to produce by the method for routine techniques with short fiber of erectting equably from a resin bed.In addition, even, also can make dissimilar feed rollers by same equipment and with a kind of method adopting dissimilar powder coated materials or convexing to form under the situation of powder.
The example of first embodiment
To particular instance that use first embodiment of the invention be described below.
[example 1]
Adopt the powder coated device fabrication feed rollers of electric field fluid among Fig. 1
The explanation of the powder coated equipment of electric field fluid that [1] is adopted
In the powder coated equipment 1 of electric field fluid, with powder coated material 21 or convex to form powder 22 and be placed on the base plate 12.Come vibrating bottom plate by powder vibrating motor 13, be evenly dispersed on the base plate thereby can will be placed on the powder coated material 21 on the base plate or convex to form powder.Air blast 15 provides the air that blows out from first discharge pipe 141, second discharge pipe 142 and jet pipe 143.
The air that blows out from first and second discharge pipes 141,142 rises towards the top of fluid container 11, so that form by powder coated material or convex to form the cloud and mist that powder constitutes.Powder coated material or convex to form powder and when it contacts by the circumferential edges of charged pin 14 and/or with charged pin 14, filled with.Powder coated material or convex to form powder and be directed onto on the core material 41 by the air that from jet pipe 143, blows out, thus core material 41 has powder coated material or convexes to form powder by static is applied.Core material can be driven by rotation motor 16 and rotate, thus powder coated material or convex to form powder and can be directed onto equably on the circumferential surface of core material.The air that is provided is with powder coated material or convex to form powder and drawn by a powder catcher 17 from the top of fluid container, enters fluid container and is recycled thereby make powder coated material once more from the bottom in the outside of fluid container or convex to form powder.
[1] manufacturing of feed rollers
(1) deposition of powder coated material
Automatic steel (SUM23L) work piece cut being become diameter is after 12mm and length are the size of 330mm, thickness is gone up in the workpiece plating be approximately the nickel of 4 μ m, thereby suppress core material.Core material is arranged on place apart from jet pipe 15cm.Then, (trade mark is " V-PET1340QDLB ", and its average grain diameter is that 25 μ m and bulk density are 0.5g/cm with polyester/epoxy powder coating material 3, make by Dai Nippon Toryo company) be placed on the base plate.With this back plate vibration so that powder coated material disperse equably.The voltage of general-20kV is applied on the charged pin then, thereby air is blown from first discharge pipe under the pressure of 0.01MPa and is blown from second discharge pipe under the pressure of 0.02MPa.Therefore, formed the cloud and mist of this powder coated material.Make the rotational speed of core material by the rotation of rotating, thereby air is blown from jet pipe under the pressure of 0.1MPa, and powder coated material is deposited to core material last 15 second by static with 20rpm.By the measured coating thickness of non-contact laser scanning micrometer (model " LSM-3100 " is made by Mitutoyo company) is 15 to 20 μ m.
(2) convex to form the deposition of powder
After the operation of (1), the washing fluid container, thus remove powder coated material fully.The core material that will have deposition powder coated material thereon is arranged on the position identical with (1).Then, (trade mark is for " MORUNDUM A ", and its average grain diameter is that 40 μ m and bulk density are 1.95g/cm with the powder that convexes to form of aluminium oxide 3, make by Showa Denko K.K.) be placed on the base plate.Vibrating bottom plate is so that this convexes to form powder disperses equably.Then, general-25kV is applied on the charged pin, thereby air blows out from first discharge pipe under the pressure of 0.0125MPa and blows out from second discharge pipe under the pressure of 0.03MPa.Therefore having formed this convexes to form the cloud and mist of powder.Core material is with the rotational speed of 20rpm under the effect of rotation motor, thereby air is blown from jet pipe under the pressure of 0.04MPa, and convexes to form powder and be deposited to core material last 15 second by static.Is 30 to 33 μ m by the measured thickness that comprises powder coated material of described non-contact laser scanning micrometer at interior total coating thickness.
(3) cure
From fluid container, take out with the core material that convexes to form powder having deposited powder coated material on it.Measured being deposited on the powder coated material on the core material and convexing to form total weight of powder is 0.6g.Core material is inserted temperature to be controlled in 180 ℃ the hot-air type drying oven.In this stove, this core material was cured 20 minutes.After making the core material cooling, measure the thickness of lobed resin bed by non-contact laser scanning micrometer.The thickness of this resin bed is in the scope of 31 to 33 μ m, so that the cylindricity that calculates according to following formula is in the scope of 0.8 to 4 μ m.In addition, the frictional force that records according to the equipment that illustrates typically among Fig. 3, calculate confficient of static friction by following program with respect to ink-jet printer gloss film.The coefficient that is calculated is in 0.65 to 0.8 scope.
With width is on the surface of the ink-jet printer gloss film of the 40mm feed rollers 3 that is arranged on horizontal fixed, thereby vertically intersects with roller and contact with this roller in the scope of 1/4 length of roller circumferential surface.When film moves simultaneously when by sinker 8 load weight (W) of 20g being applied to an end of this film with 500mm/ minute draw speed, from table, read and calculate the frictional force (f that is added on the force cell 7 according to following formula (1); Gf).
By the way, the opposite end of roller 9 is fixed by ball bearing, and the coefficient of rolling friction of roller 9 is considered to 0 like this.
Confficient of static friction=(2/ π) * In (f/w)
When using the feed rollers of the confficient of static friction of making like this with less cylindricity and appropriateness, can infer paper can be under the effect of enough carrying capacitys conveying and the inclination that paper can not occur is moved with being stabilized.
[example 2]
With with embodiment 1 in identical mode make feed rollers, (trade mark is " V-PET#1340QDLB " except adopting the epoxy powder coating material, its average grain diameter is 25 μ m, make by Dai Nippon Toryo Co., Ltd) as powder coated material and adopt aluminium oxide (trade mark is " A ", its average grain diameter is 40 μ m, is made by Fujimi company) as convexing to form powder.With with embodiment 1 in the lobed resin layer thickness that records of same mode be 30 to 33 μ m.With with embodiment 1 in the cylindricity that calculates of same mode be 0.7 to 3 μ m.In addition, with embodiment 1 in the confficient of static friction that records of same mode with respect to ink-jet printer gloss film approximate confficient of static friction in embodiment 1 greatly.
[example 3]
With with embodiment 1 in same mode make feed rollers, (trade mark is " BIRYUSIA " except adopting the epoxy resin coating material, its average grain diameter is 20 μ m, make by Nippon Paint Co., Ltd) as powder coated material and adopt aluminium oxide (trade mark is " MORUNDUM A ", its average grain diameter is 40 μ m, is made by Showa Denko K.K.) as convexing to form powder.With with embodiment in the thickness of the lobed resin bed that records of same mode in the scope of 29 to 32 μ m.With with embodiment 1 in the cylindricity that calculates of identical mode in the scope of 0.8 to 4 μ m.In addition, with embodiment 1 in the confficient of static friction that records of identical mode with respect to ink-jet printer gloss film approximate confficient of static friction among the embodiment 1 greatly.
Can infer from above-mentioned result and the feed rollers that can obtain to have the carrying capacity identical according to embodiment 2 and 3 with embodiment 1.
[comparison example 1]
With with the deposition step of powder coated material in embodiment 1 in the same mode make a plurality of feed rollers continuously, its difference is: in advance with powder coated material with convex to form powder, thereby adopt mixture of powders.Like this, can find following variety of issue.
(1) quantity that swims in quantity and the bottom that swims in cloud and mist in the cloud and mist top is significantly different each other, because powder coated material and the proportion that convexes to form between the powder are different with charge characteristic.Therefore, the thickness of lobed resin bed and cylindricity alter a great deal in an end, center and another end of roller.That is to say that the thickness of lobed resin bed changes in the relative broad range of from 31 to 50 μ m, and its cylindricity changes in the relative broad range of 0.7 to 67.5 μ m.
(2) reclaimed by powder catcher and recycling powder coated material and convex to form the ratio of powder because powder coated material and convex to form the difference of average grain diameter between the powder, bulk density etc. and change.Therefore, the powder coated material that is comprised in lobed resin bed also changes along with the time with the ratio that convexes to form powder.So just be difficult to obtain having the roller of stabilised quality.
(3) often be coated with powder coated material on the surface that convexes to form powder.Therefore, reduce the confficient of static friction of touching printer gloss film with respect to spray, thereby can not obtain having the roller of enough carrying capacitys.
By the way, the present invention is not limited to the explanation of above-mentioned specific embodiment, and without departing from the present invention, can make various changes according to application target etc.That is, be applied on the charged pin so that powder coated material or the voltage that convexes to form powder deposition can regulated in-5 to-45kV scope.Be used for making powder coated material or convex to form the air pressure that blows out from first discharge pipe of powder deposition, the air pressure that blows out from second discharge pipe and from jet pipe, blow the pressure of the air to the core material can be respectively in 0.005 to 0.1MPa scope, in 0.01 to 0.3MPa scope and in 0.01 to 0.3MPa scope, regulate.Also have, it is unpractiaca only using an equipment when being cleaned.That is to say, the equipment that is specifically designed to powder coated material respectively and convexes to form powder can be set, so that can make continuously.
According to the present invention, convexing to form powder can be disperseed and be deposited equably, thereby can accurately control the thickness of lobed resin bed.In addition, being suitable for the feed rollers of the paper of any kind most can be according to the kind of selecting to convex to form powder, size etc. and manufactured.In addition, according to the present invention, feed rollers can be manufactured into the feed rollers that has even carrying capacity vertically for a kind of, and the inclination that can not occur paper so that paper can be carried with being stabilized is moved.
Second embodiment
To describe the second embodiment of the present invention below.
According to the present invention, provide a kind of electric field fluid powder coated equipment, thereby this equipment comprises a fluid container and is used for putting the multiple powder of being made by different materials into fluid container forms multiple cloud and mist in fluid container inside under multiple molding condition device.
To the volume of above-mentioned " fluid container ", shape, material etc. without limits.According to the present invention, this fluid container can comprise the opening that is used for workpiece is moved into and shifts out fluid container, and the device that is used for travelling workpiece.
Special in the band conveyor equipment that can be coated with continuously, preferably, the opening portion that will be used to draw and collect cloud and mist is located at the top of container, and the space that will be used for keeping being distributed to the powder of outside is located at each opening that is used for workpiece is moved into and shifts out container.In addition, preferably, each opening that is used for workpiece is moved into and shifts out container becomes the slit that is formed on product crosssection shape.
In a second embodiment above-mentioned " cloud and mist " is made of various powders, and these powder are blown at gas, as the bottom from fluid container and are upwards blown under the effect of the air the fluid container and floating equably to meet the formation condition of cloud and mist.Various powders is swum in by the position of the upward force that air-flow provided of blowing vertically upward with the downward dynamic balance that is provided by gravity, so that form cloud and mist.
Preferably, select these conditions being optimum for being included in for the powder of the corresponding kind in the mixture of powders of second embodiment of the invention.
According to a second embodiment of the present invention, a kind of method of producing conveying roller is provided, it may further comprise the steps: the multiple powder of being made by different materials is put in the fluid container, thereby under the cloud and mist formation condition that for various powder is optimum respectively, at the multiple cloud and mist of the inner formation of fluid container; And, thereby make this core material coating go up various powders at the inner mobile core material of the fluid container that multiple cloud and mist is housed.
According to the present invention, various powders can be made of powder coated material and the composition that convexes to form powder at least.
The manufacturing of conveying roller can be undertaken by using the powder coated equipment of electric field fluid.In addition, in manufacture method, above-mentioned " cloud and mist " can form in the mode the same with aforesaid way.
Used in a second embodiment core material is identical with the core material of first embodiment.
Used in a second embodiment above-mentioned " powder coated material " is basically the same as those in the first embodiment, and can be applied on the core material and can comprise a kind of resin that is subjected to thermmohardening or melted by heating by electrostatic force, this resin be cured once more along with decrease of temperature.
Used in a second embodiment powder coated material is the same with first embodiment's.Though this powder coated material can comprise the component that two or more are selected from thermosetting resin and thermoplastic resin, consider in order to set easily to be used to that cloud and mist is formed and the condition of charging that preferably this powder coated material comprises a kind of component.
Used in a second embodiment convex to form the same of powder and first embodiment, and can under the effect of electrostatic force, be applied on the core material.Can to comprise the component that two or more are selected from above-mentioned material though this convexes to form powder, to consider in order setting easily to be used to that cloud and mist is formed and the condition of charging, preferably this powder coated material comprises a kind of component.
About powder coated material and convex to form the optimum condition of powder also with of the present invention first
Embodiment's is the same.
By the way, by powder coated material or convex to form powder powder coated material and convex to form the represented bulk density of bulk density in the mixture of powders preferably from 0.1 to 10g/cm 3Scope in, particularly preferably in from 0.3 to 3g/cm 3Scope in, more particularly preferably in 0.7 to 1.5g/cm 3Scope in.If bulk density is lower than 0.1g/cm 3, then lobed resin layer thickness can be not enough.On the other hand, bulk density may be greater than 10g/cm 3, but often can not form uniform cloud and mist.
The powder coated equipment of electric field fluid of the present invention comprises: the powder coated part that a for example fluid container, and the in-plane of at least two longshore current body containers forms.Each powder coated part includes (1) and is used for gas blow-off outlet that powder is upwards blown; (2) be used to form the gas blow-off outlet of cloud and mist; (3) Charging system; (4) be used for the blow-off outlet of pulverized powder.Each powder coated part all can have such structure, and the mixture of powders that is about to contain the multiple powder of being made with different ratios by different materials sprays on the workpiece in turn.
The powder coated equipment of electric field fluid can be used to heat or the devices such as heating furnace of coated thin film sclerosis be used in combination.In the powder coated equipment of this electric field fluid, can a plurality of workpiece be sent in the corresponding cloud and mist successively with fixing interval, and spray to mixture of powders on a plurality of workpiece and make it sclerosis, so that can be coated with a large amount of workpiece continuously.
In two or more powder coated parts, mixture of powders is upwards blown by the air blow-off outlet that is used for powder is upwards blown.Form cloud and mist by the air blow-off outlet that is used to form cloud and mist.Make the mixture of powders charging by charging unit.Then.Mixture of powders is sprayed onto on the workpiece by the air blow-off outlet with the ejection powder, so that the applied mixture of powders of going up of workpiece.The position of the air blow-off outlet that is used for the air blow-off outlet that powder is upwards blown, the air blow-off outlet, the charging unit that are used to form cloud and mist and is used for pulverized powder and the relative position relation between these parts have no particular limits, as long as can form the cloud and mist of being scheduled to and the mixture of powders of scheduled volume can be applied on the workpiece.
In in the powder coated part that two or more positions form each, the air blow-off outlet that preferred (1) is used for powder is upwards blown, the air blow-off outlet that (2) are used to form cloud and mist, (3) charging unit and (4) be used to spray the air blow-off outlet of powder can be respectively be operate under the optimum condition for the various powders of making by different materials.
When these parts are operated in the above described manner, can more easily form cloud and mist, thereby make the content of the various powders that in mixture of powders, comprises can be different.Therefore various powders can be applied on the workpiece, thereby makes the applied various powders that goes up of this workpiece.
This various powders is dispersed in the fluid container, thereby forms floating cloud and mist.Cloud and mist can be formed by mixture of powders, and the air that this mixture is upwards blown and evenly floating air blow-off outlet (hereinafter referred to as first discharge pipe) and being used for by being used for upwards blowing powder by gas, for example is blown into this fluid container from the fluid container bottom forms the air blow-off outlet (hereinafter referred to as second discharge pipe) of cloud and mist.
As charging unit, provide make powder by charged pin device or make powder and the contacted device of this charged pin.This charged pin can be replaced by the porous charging panel that can carry powder.In this case, the exchange hole that powder can be by passing charging panel or filled with by contacting with the wall of exchange hole.
At the powder coated equipment of electric field fluid, two or more coated portion have been formed.In being arranged on the powder coated part of primary importance, (be referred to below as the first powder coated part), regulate the pressure of the air from first discharge pipe, upwards blow and comprise the cloud and mist (first cloud and mist) of powder of the corresponding kind of special ratios from the air pressure that second discharge pipe is upwards blown with formation.When forming first cloud and mist, in the powder coated part of the second place (below be called as the second powder coated part), the pressure of regulating the pressure of the air that upwards blows from first discharge pipe and the air that upwards blows from second discharge pipe comprises the cloud and mist (second cloud and mist) of the powder of corresponding kinds different in its ratio and first cloud and mist with formation.This rule also is applied in powder coated part and is formed on three or more local situation.
After forming these clouds and mists, in the first powder coated part, the mixture of powders that forms first cloud and mist is by chargings such as charged pins, and this charged pin etc. has and the voltage that is suitable for dusty spray mixture on workpiece.Then, mixture of powders is adjusted to the air that is used for powder coated pressure to workpiece and is sprayed on workpiece by having, and wherein air is to blow out from the air blow-off outlet (hereinafter referred to as jet pipe) that is used for dusty spray.Therefore, mixture of powders is sprayed onto on the workpiece, thereby makes the workpiece coating go up mixture of powders.Then, in the first powder coated part, the workpiece that scribbles powder under the effect of the second powder coated part, be suitable for forming under the condition of mixture of powders of second cloud and mist by coated powder continuously.When the powder coated part of further formation, workpiece in the same manner as described above, on applied under the condition of the mixture of powders that is suitable for forming cloud and mist powder.Therefore finished coating.
The example of second embodiment
To the example of the second embodiment of the present invention be illustrated in greater detail below.
[example 1]
By conveying roller in the powder coated device fabrication of electric field fluid shown in the Figure 4 and 5
[1] general introduction of the powder coated equipment of employed electric field fluid
Fig. 4 is for having shown the cutaway view of the powder coated equipment of electric field fluid of the conveying roller of manufacturing in example 1 typically.Fig. 5 is the typical top view (but not demonstrating any cloud and mist) of powder coated machine.
In powder coated machine 1, powder coated material 21 and convex to form powder 22 and be placed on the base plate 12.By powder vibrating motor 13 these base plates of vibration, thereby two kinds of powder that are placed on the base plate can be evenly dispersed on the base plate and be mixed into mixture of powders mutually on the base plate.Under the condition that the air that is provided from air blast 15 can adapt at the powder with the corresponding kind that is comprised in mixture of powders, be blown by the first discharge pipe 141a and 141b, the second discharge pipe 142a and 142b and jet pipe 143a and 143b.Among the first and second discharge pipe 141a, 141b, 142a and the 142b each is equipped with the gas blow-off outlet that a plurality of energy controls blow out pressure.Every jet pipe 143a and 143b are provided with a plurality of gas blow-off outlets, and the blow out air pressure of these blow-off outlets can be controlled, so that this mixture of powders is sprayed on the core material.
The air that blows out from the first and second discharge pipe 141a, 141b, 142a and 142b rises towards the top of fluid container 11, forms cloud and mist thereby contain powder coated material with the mixture of powders that convexes to form powder, and these clouds and mists are different mutually on ratio.Containing powder coated material is recharged when it contacts by the circumferential edges of charged pin 14a and 14b and/or with these charged pins with the mixture of powders that convexes to form powder.This mixture of powders is injected on the core material 41 under the effect of the air that blows out from jet pipe 143a and 143b, so that core material 41 is by the applied mixture of powders of going up of static.Core material can be driven by rotation motor 16 and rotate, and can be ejected into equably on the circumferential surface of core material with the mixture of powders that convexes to form powder so that contain powder coated material.Draw institute's air supplied and mixture of powders from the top of fluid container by powder catcher 17, so that make mixture of powders insert the fluid container and be recycled once more from the outer lower portion of fluid container.
[2] manufacturing of conveying roller
(1) formation of cloud and mist in the first and second powder coated parts
Easy smear metal steel (SUM23L) workpiece is cut into a plurality of, and it is that 12mm and length are the size of 330mm that each sheet all has diameter, and subsequently, each sheet is electroplated the upward thick nickel of about 4 μ m, to make a plurality of core materials that will use.First core material that forms lobed resin bed on it independently is arranged on the place of 15cm apart with the jet pipe 143a of the first powder coated part.Then, will (commodity be called " V-PET1340QDLB ", and its average grain diameter is that 25 μ m and bulk density are 0.5g/cm as the polyester/epoxy powder coating material of powder coated material 3, make by Dai Nippon Toryo Co., Ltd) and as the aluminium oxide that convexes to form powder (commodity are called " MORUNDAUM A ", and its average grain diameter is that 40 μ m and bulk density are 1.95g/cm 3, produce by Showa Denko K.K.) be placed on the base plate.Vibrate this base plate, disperse equably thereby make powder coated material and convex to form powder.
Then, in the first powder coated part, the first discharge pipe 141a and the second discharge pipe 142a are being adjusted to the blow out air under the pressure that blows out of 0.003MPa and 0.02MPa respectively.Therefore, formed and be applicable to that coating is included in first cloud and mist of the powder coated material in the mixture of powders.
When forming first cloud and mist, in the second powder coated part, the first discharge pipe 141b and the second discharge pipe 142b are being adjusted to the blow out air under the pressure effect that blows out of 0.007MPa and 0.10MPa respectively.Therefore, forming the second powder coated cloud and mist that convexes to form that is applicable in mixture of powders to be comprised near the place of first cloud and mist.
(2) mixture of powders is applied on the core material
When making the core material that is immersed in first cloud and mist that in the first powder coated part, forms in the above-mentioned steps (1) by rotation motor with the rotational speed of 20rpm, by have-the charged pin 14a of 35kV voltage makes mixture of powders charged, and blows out under the pressure from jet pipe 143a blow out air 15 seconds at 0.07MPa.Therefore, be applied on the core material by static under the condition of the powder coated material that just in being applicable to the coated powder mixture, comprised of mixture of powders.
Then, make and wherein finished the core material that in the first powder coated part, is coated with and move in second cloud and mist that in above-mentioned steps (1), is formed in the second powder coated part so that in abutting connection with first cloud and mist.By have-the charged pin 14b of the voltage of 15kV makes this mixture of powders charging, and blows out under the pressure from jet pipe 143b blow out air 15 seconds at 0.03MPa.Therefore, be applied on the core material that scribbles powder coated material by static under the condition that convexes to form powder that this mixture of powders is comprised in being suitable for the coated powder mixture.Scan the thickness that micrometer (model " LSM-3100 " is made by Mitutoyo company) is measured such coated thin film that forms with non-contact laser.As a result, described thickness is 30 to 35 μ m.
(3) cure
Taking-up has been coated with the core material of the mixture of powders that includes powder coated material and convex to form powder and has weighed from fluid container.As a result, the total amount that is applied to the mixture of powders on this core material is 2g.This core material is put into the hot-air type drying oven that its temperature is adjusted to 180 ℃ to be cured 20 minutes.Continuously second core material or the like is immersed in the cloud and mist in the same manner as described above.Core material is provided as mentioned above continuously, thereby produces 500 rollers.After cooling, the lobed resin layer thickness of measuring by non-contact laser scanning micrometer is 32 ± 4 μ m, and is 2 to 7 μ m according to the cylindricity that following formula calculates.In addition, defect rate is 1.6%.By the way, defect rate is under the institute's coated product that thickness and its variation is exceeded preassigned is decided to be the condition of substandard products, calculates according to following formula.
Defect rate=(quantity of defective coated product)/(sum of coated product) * 100%
Each coated product is according to the measured frictional force of the equipment shown in typically among Fig. 3, calculates with following procedure with respect to the confficient of static friction of ink-jet water printer gloss film.As a result, confficient of static friction is in 0.68 to 0.78 scope.
With width is on the surface of the ink-jet printer gloss film of the 40mm feed rollers 3 that is arranged on horizontal fixed, so that intersect vertically with this roller and contact with this roller on 1/4 length of the circumferential surface of this roller.Be applied on the end of this film by the load weight (w) of sinker 8 when this film moves simultaneously with 500mm/ minute draw speed, from table, read the frictional force (f that is applied on the force cell 7 20g; Gf) and according to following formula (1) calculate.
By the way, the opposite end of roller 9 is fixed by ball bearing, and the coefficient of rolling friction of roller 9 just is considered to 0 like this.
Confficient of static friction=(2/ π) * In (f/w) (1)
When use produce like this have the feed rollers of less cylindricity and appropriate confficient of static friction the time, can infer paper can be under the effect of enough carrying capacitys conveying and the inclination that paper can not occur is moved with being stabilized.
[comparison example 1]
By adopt with embodiment 1 in identical powder coated material and the identical mixture of powders that convexes to form powder make conveying roller, its difference is, in the first and second powder coated parts of the powder coated equipment of electric field fluid, the air pressure that will from first discharge pipe, blow out, the air pressure that from second discharge pipe, blows out, be applied to the voltage on the charged pin and the air pressure that from jet pipe, blows out be set at respectively 0.01MPa, 0.05MPa ,-25kV and 0.05MPa.Then, to these conveying rollers carry out with example 1 in identical evaluating characteristics.
As a result, lobed resin layer thickness is 32 ± 6 μ m, and cylindricity is 2 to 10 μ m, and confficient of static friction is 0.65 to 0.75, and defect rate is 4.4%.
From above-mentioned explanation, can obviously find out, the defect rate of the conveying roller that manufactures in example 1 is compared remarkable reduction with the defect rate of the conveying roller that manufactures in comparison example 1, and the variation of the thickness of the conveying roller that manufactures in example 1, cylindricity and confficient of static friction is all less.
By the way, this equipment is not limited to the embodiment shown in the Figure 4 and 5.The position that in fluid container, forms powder coated part without limits, as long as mixture of powders can be under the situation that does not break away from the claim protection domain successively and applied continuously.Perhaps, can form three powder coated parts as shown in Figure 6.The position that in each powder coated part, is provided with first and second discharge pipes without limits, as long as mixture of powders can be disperseed and be floated under the coating condition that adapts with the powder that is included in the corresponding kind in the mixture of powders equably.But base plate 12 can wait with the porous membrane that can not allow mixture of powders pass can allow gas such as air pass and replace, so as air etc. can be from the lower surface circulation of porous membrane etc. so that mixture of powders flow, thereby form corresponding cloud and mist.
In addition, preferably, in the manufacturing of conveying roller, according to kind, coating of particles, the average grain diameter of powder coated material wait select aptly from first and second discharge pipes, to blow out, be used to form and be applicable to and powder coated material be applied to core material or deposit the air pressure on the core material that forms raised material and being used for of blowing out is applied to gas pressure on the core material etc. with mixture of powders from jet pipe.Can be selected in being applied to voltage on the charged pin etc.-25kV is in the scope of-50kV.
In addition, preferably, wait being used to form of suitably selecting from first and second discharge pipes, to blow out to be suitable for that powder coated material is applied to core material according to kind, its coating of particles, its average grain diameter of powder coated material or deposit the air pressure on the core material that forms raised material and being used for of blowing out is applied to gas pressure on the core material etc. with mixture of powders from jet pipe.Can be selected in being applied to voltage on the charged pin etc.-10kV is in the scope of-20kV.
In this case, preferably, the absolute value that is applied to the difference between the voltage on corresponding charged pin etc. preferably is not less than 10kV.
Can and include powder coated material and the electrical potential difference that convexes to form between the charging mixture of powders of powder produces electrostatic force according to the core material of common ground connection.Make mixture of powders high voltage can be applied to nozzle on the mixture of powders etc., so that make the mixture of powders charging by one.Mixture of powders can be ejected on the core material of ground connection, core material just can appliedly be gone up mixture of powders like this.By the way, under the dielectric constant condition with higher of mixture of powders, mixture of powders can only be recharged by the friction of passing generations such as nozzle at mixture of powders.
According to the powder coated equipment of electric field fluid as second embodiment of the invention, under the corresponding coating condition that adapts with various powders, the mixture of powders that contains the various powders that is made of different materials can be applied on the workpiece continuously.
In method according to the production conveying roller of second embodiment, containing powder coated material can be applied on the surface of core material under the condition that is optimum for two kinds of powder with the mixture of powders that convexes to form powder, and coating can be carried out in a plurality of cloud and mist layers, and the condition that wherein is used to form a plurality of clouds and mists exists simultaneously.Therefore, can produce stable conveying roller, so that do not change at aspects such as thickness, cylindricities.
And, can widen the scope that is used to select to convex to form the powder kind, and can reduction in the numbers of seconds.Therefore, can reduce production costs, thereby can obtain fabulous productivity ratio.
The 3rd embodiment
To describe the third embodiment of the present invention below.
According to the present invention, a kind of coating process is provided, comprise at least a powder coated material is applied on the surface of the work this workpiece is rotated, in this fluid container, be formed with the cloud and mist that comprises powder coated material at least.
In addition, according to the present invention, a kind of coating process is provided, comprise by moving a plurality of workpiece, at least a powder coated material is applied to this workpiece is rotated, in this fluid container, be formed with the cloud and mist that comprises powder coated material at least.
That is to say that this method is a kind of coating process, a plurality of workpiece wherein being provided and wherein being coated with is to move under the condition of rotating simultaneously at a plurality of workpiece to carry out continuously.
Above-mentioned " cloud and mist " refers to a kind of as cloud and mist floating powder coated material or one group of mixed-powder that includes a kind of powder coated material and another kind of dusty material (will have only the single powder of powder coated material and the mixed-powder that includes powder coated material to be called " powder " hereinafter usually).
Above-mentioned " powder coated material " its key component comprises the resinous principle that can form coated thin film.In case of necessity, it can also comprise curing agent, promoter, coating etc.Powder coated material provides with the form of particle, so that can form cloud and mist in fluid container.The average grain diameter of powder coated material preferably is not more than 250 μ m (more preferably no more than 20 to 50 μ m, preferably be not more than 30 to 50 μ m, and be not more than 5 μ m usually).If average grain diameter greater than 250 μ m, then is difficult to form uniform cloud and mist.
Though to the resin Composition that comprises powder coated material without limits, the preferred employing comprises thermosetting resin or the thermoplastic resin powder coated material as main component.The example of thermosetting resin can comprise epoxy resin, unsaturated polyester resin, acrylic resin, fluororesin, phenolic resins, melmac, polyurethane resin, silicones etc.Be preferably glycidol ether type epoxy, acrylic resin etc. especially.The example of thermoplastic resin can comprise saturated polyester resin, the olefine kind resin as polyethylene or polypropylene, vinyl chloride resin, acrylonitrile-butadiene-styrene copolymer resin etc.Be preferably saturated polyester resin etc. especially.Powder coated material can only comprise and a kind ofly is selected from the component of above-mentioned thermosetting resin and thermoplastic resin or can comprises two or more components.
The example as other powder of cloud and mist constituent outside above-mentioned powder coated material comprises such powder, and it can give the function that can not obtain to coated thin film from described powder coated material.For example, can adopt and be used for convexing to form powder etc. as other powder for what coated thin film provided roughness.
Above-mentioned " fluid container " refers to and cloud and mist remained on its inner container.The shape of fluid container can resemble a kind of pipeline, and its entrance and exit is always opened or had door section, so that this door section can be closed when needed.
In fluid container, for example, the powder that is deposited on the fluid container base plate can be by upwards blowing formation from the base plate side with powder.Outside powder upwards being blown, also get this powder, so that can more stably form cloud and mist from the top board side draught from the base plate side.Perhaps, can this powder be shaken off, so that can form cloud and mist from top board.Except powder being shaken off, can also powder upwards be blown from the base plate side, thereby can form cloud and mist more reliably from the top board side.
This workpiece above-mentioned " workpiece " had no particular limits, as long as can remain in the cloud and mist.Equally, the shape to this workpiece has no particular limits.For example, this workpiece can have a kind of shape of complexity, and for example concave portions, male portion are graded.In addition, this workpiece can be solid or hollow.
Workpiece material is had no particular limits.When adopting the electrostatic fluid dip-coating method, the surface of this workpiece can preferably be made of metal, so that the surface of this workpiece can be recharged easily.This workpiece can be made of metal fully.For example, this workpiece can be by electroplating easy smear metal steel, aluminium alloy, stainless steel, plated resin, formation such as electroconductive resin.
Above-mentioned " rotation " had no particular limits, as long as this rotation is to carry out with formation that does not hamper cloud and mist and the speed (in 10 to 100rpm scope) that can not hinder powder deposition greatly.Be arranged on the turning cylinder that is used in the workpiece workpiece is rotated and have no particular limits, as long as this does not hinder level and smooth rotation.Equally, above-mentioned " moving " also being had no particular limits, is that speed (at 10 to 100m/ minutes) can not hinder the deposition of powder is greatly carried out as long as this moves.
When forming cloud and mist, be very difficult to keep evenly, because the proportion of powder is according to the kind variation of powder according to the distribution of powder kind in the cloud and mist with mixture of powders.Yet, when rotating like that as described herein or rotating and moving, can in this cloud and mist, form new air stream, and can reduce the inhomogeneities of distribution.And, irrelevant with the direction of motion, can make the thickness of coated thin film even.
When workpiece was cylindrical in this coating process, this workpiece can be rotated (perhaps move simultaneously and rotate) under the condition that this workpiece is suspended in the cloud and mist.As shown in Fig. 7 A and the 7B, for example, workpiece 2 can be hung by suspender 11a, and this suspender is installed in that trolley conveyer 1a goes up and each suspender is equipped with rotating part 111a.When this telpher conveyor 1a was moved, each workpiece leaned against can move simultaneously under the situation about moving of frictionally sliding on the belt 3 in a part that makes rotating part 111a and rotates.
Each workpiece can be rotated (perhaps move simultaneously and rotate) under its situation about standing vertically.Shown in Fig. 8 A and 8B, for example, each seat formula anchor clamps 11b that is provided with rotating part 111b can be placed in or be installed on the floor conveyer 1b, so that workpiece 2 is supported by seat formula anchor clamps 11b respectively.In this case, when ground conveyer belt 1b moves,, can move and rotate each workpiece simultaneously in that the part of formula holder part 11b is leaned against under the situation that frictionally slip is moved on the belt 3.
When each workpiece when all being cylindrical, preferably this workpiece should be set like this, promptly the longitudinal axis of this workpiece be level or this workpiece rotate around axis as turning cylinder.As shown in Fig. 9 A and the 9B, for example, paired rotation guide 12c and 12c ' can be located among the conveyer 1c and 1c ' that moves the while keeping parallelism, so that be used in the paired support member 111c and 111c ' embedding rotation guide of place, opposite end supporting workpiece 2, thus, paired support member 111c and 111c ' can freely rotate.In these support members one is leaned against on the fixing belt 3 slide and move, so that be resisted against on the support member with friction mode.Therefore, can move and rotate these workpiece simultaneously.
By the way, the upright position in the fluid container axis is had no particular limits.Be also referred to as " laying " below being positioned at with making axis horizontal.
When as mentioned above, when these workpiece were laid, minimum was reduced in the influence that can make kind according to powder be easy to the vertical uneven distribution that produces in cloud and mist.When deposition contains the mixture of powders of the powder of being made by the relatively large material of difference of specific gravity, lay workpiece especially effectively (for example, maximum specific weight difference is not less than 4).In this case, especially can reduce the variation (for example, coated thin film varied in thickness vertically is not more than 10 μ m) of the thickness aspect of coated thin film.Even in the less in vertical direction situation of cloud and mist, also can be coated with.Therefore, can reduce the space that is used to form this cloud and mist, help reducing equipment size thereby lay these workpiece.
Above-mentioned " deposition " can be undertaken or can preferably be beneficial to control deposition by static by the contact between powder and each the accumulation of heat workpiece.That is to say, preferably with at least one charging in powder and the workpiece, thereby make powder by electrostatic precipitation on workpiece.
According to coating process of the present invention, each workpiece all rotates in cloud and mist, thus the scrambling that especially can suppress to deposit.Therefore, can form coated thin film more uniformly.For example, when forming target thickness on by the surface of electrostatic fluid dip coating and being the coated thin film of 35 μ m at cylindrical work, maximum coated thin film thickness on the circumferential discontinuity and the difference between the minimum coated thin film thickness are compared with the situation of rotating, and can be suppressed to be not more than 30% (further to 15%).According to coating process of the present invention,, can also reduce the varied in thickness of coated thin film longitudinally greatly except resulting effect in coating process of the present invention.That is, maximum coated thin film thickness along the longitudinal and the difference between the minimum coated thin film thickness can be suppressed to and be not more than 10 μ m (especially can be not more than 5 μ m, more particularly be not more than 2 μ m).
According to the present invention, provide a kind of by adopting coating process to make the method for conveying roller, wherein: this cloud and mist has comprised powder coated material and has convexed to form powder; Workpiece or each workpiece are the cylindrical core body material; And formed one and press layer on the surface of core material, this pressures layer contains by what the resin bed of being made by powder coated material was fixed and convexes to form powder.
Above-mentioned " core material " is cylindrical and the diameter of its circular cross section has no particular limits.In general, this diameter arrives in the scope of 20cm 0.8.In addition, the length to core material has no particular limits.In general, this length arrives in the scope of 500cm 250.
Can adopt material same as described above material as core material.Especially, preferably a kind of workpiece with the surface that is made of metal is so that powder coated material can effectively and equably be coated on the core material by the electrostatic powder coating.
Can adopt material same as described above as above-mentioned " powder coated material ".In addition, adopt material same as described above as the resin Composition that constitutes powder coated material.Particularly preferably be a kind of and contain a kind of epoxy resin as main component and also comprise a kind of powder coated material that contains the mylar of carboxyl group as curing agent.In addition, preferably adopt the epoxy resin of glycidol ether type as epoxy resin.Powder coated material is easy to control equably the thickness of coated thin film.And, especially can come to convex to form powder firmly and fix by powder coated material.
Above-mentioned " convexing to form powder " forms roughness in the pressure layer as the conveying roller surface, can stably carry the workpiece that will carry like this.The material that convexes to form powder can be selected according to purpose.For example, this material can be selected from metal (for example nickel, iron etc.), pottery (for example aluminium oxide, iron oxide, chromium oxide, cerium oxide, titanium oxide, amorphous silica, mullite, carbide etc.) and/or resin etc.Especially, preferably adopt the powder of hardness height and high abrasion resistance, for example alumina powder, croci, chromium oxide powder, ceria oxide powder, titanium dioxide powder etc. are so that obtain very durable pressure layer.Can adopt a kind of powder as convexing to form powder, the mixture that perhaps adopts two or more powder is as convexing to form powder.By the way, only adopt a kind of powder to help controlling the condition that forms cloud and mist, charge condition etc. as convexing to form powder.
The average grain diameter that convexes to form powder can be selected according to purpose.In general, the average grain diameter that convexes to form powder preferably in the scope of 5 to 250 μ m (in the scope particularly preferably in 10 to 120 μ m, more in the scope particularly preferably in 30 to 50 μ m).If less than 5 μ m, then there is the trend that is difficult to form enough coarse pressure layer in average grain diameter.If average grain diameter greater than 250 μ m, then is difficult to fix/remain on the surface of core material convexing to form powder.Especially when conducts such as adopting aluminium oxide, iron oxide, chromium oxide, cerium oxide, titanium oxide convexed to form powder, average grain diameter preferably was selected in the scope of 15 to 80 μ m.When adopting amorphous silica, mullite, when conducts such as carbide, metal dust convexed to form powder, average grain diameter preferably was selected in the scope of 30 to 110 μ m.
According to the present invention, when the powder coated material of 100 parts by weight (below be called " part " for short) is provided, the amount that convexes to form powder is preferably in 5 to 250 parts scope, in 10 to 200 parts scope, more particularly preferably in 50 to 150 parts the scope.Can reduce if the amount that convexes to form powder, then is formed on the lip-deep protruding quantity of roller less than 5 parts, thereby often can not obtain being enough to the frictional force of conveyance of sheets.If instead the quantity that convexes to form powder is greater than 250 parts, then this convexes to form powder and in use may come off, and may surpass the fully upper limit of fixed lobe formation powder of powder coated material because convex to form the amount of powder.
Average grain diameter (the D of powder coated material D) and convex to form the average grain diameter (D of powder f) ratio (D D/ D f) preferably in 0.3 to 0.7 scope, in 0.4 to 0.5 scope.Work as D D/ D fIn the time of in this scope, can produce the pressure layer that for paper sheet delivery, has appropriate frictional force.If D D/ D fBe lower than 0.3, then convex to form powder and just can not be firmly fixed, thereby it may come off.If D D/ D fBe higher than 0.7, then formed thick resin film on the surface of powder convexing to form, thereby reduced frictional force.As a result, can not form stable pressure layer satisfactorily.
Above-mentioned " press layer " is a kind ofly to have by the layer that convexes to form the roughness that powder forms in the surface, so that by stably carrying the workpiece that will carry based on the enough frictions on the roughness.The thickness of pressing layer is had no particular limits, and preferably select according to the characteristic of the workpiece that will carry.In general, this thickness is selected in the scope of 10 to 500 μ m (especially in the scope of 15 to 120 μ m, more specifically in the scope of 20 to 40 μ m).By the way, press the thickness of layer to be considered to distance the top from the surface of core material to the highest projection.
When as in the conveying roller production method, use area of section 0.5 to 7.5cm 2Scope and length in 20 to 50cm scopes core material and average grain diameter in 20 to 50 mu m ranges convex to form powder the time, should be not more than 10 μ m (especially being not more than 5 μ m) with pressing the maximum bed thickness of layer and the difference between the minimum bed thickness to be chosen to be more preferably no more than 2 μ m.
According to the conveying roller production method, can obtain a kind of conveying roller, the thickness of wherein pressing layer along all directions all be uniformly and the cylindricity that wherein calculates according to following formula (1) be not more than 10 μ m (especially be not more than 5 μ m, more specifically be not more than 4 μ m).And resulting conveying roller can be used for the diversified workpiece that is transferred, so that can accurately carry any workpiece and can not occur tilting mobile.
Cylindricity (μ m)=(maximum of external diameter)-(minimum of a value of external diameter)
The example of the workpiece that can carry by the conveying roller of the inventive method manufacturing comprises various paper, for example normal paper, recycled paper, resin impregnated paper, heat-transferring printing paper, art paper, glossy paper, banks etc., also comprise non-stationery sheet material or film, the projecting apparatus sheet of for example putting on the shelf, gloss film, laminate film etc.This conveying roller also is applicable to carries the workpiece that requires high delivery precision.This conveying roller especially preferably is used in the supply unit part of printer, facsimile machine, duplicator etc.
The example of the 3rd embodiment
To be explained in more detail embodiments of the invention below.
[1] example 1
Adopt electrostatic fluid dipping system shown in Fig. 7 A and the 7B and spinning solution to make feed rollers
(1) general introduction of electrostatic fluid dipping system
Figure 10 is the typical front perspective view of the electrostatic fluid dipping system 4 of use in example 1.
It is that 1.7m and width are the fluid container 41 of 1m that electrostatic fluid dipping system 4 has total length.The similar substantially pipeline of its shape of this fluid container and have the entrance and exit of opening.Be set at outside on this fluid container at the rotating mechanism shown in Fig. 7 A and the 7B.In this rotating mechanism each can move a core material when the major axis as its rotating shaft rotates.In addition, can be coated with a plurality of core materials simultaneously.
On the other hand, (cure coating material, convex to form powder etc.) mixture of powders 5 of putting in the electrostatic fluid dipping system is vibrated under the effect of vibrating motor 43, thereby is dispersed on the base plate.Then, this mixture of powders provide by hair-dryer 44 and effect through first and second discharge pipes 451 and 452 air that are blown under develop into cloud and mist.The cloud and mist of mixture of powders contacts by the circular edge of charged pin 46 and/or with charged pin and is recharged.Then, cloud and mist is sprayed onto on each core material by jet pipe 453.The part of this cloud and mist is sucked out this fluid container on the top of fluid container, thereby is collected by powder catcher 47, and the Returning fluid container.By the way, three first discharge pipes, three second discharge pipes and three jet pipes are set in the fluid container with fixing interval.
(2) employed core material, powder coated material and convex to form powder
It is that 12mm and length are the cylinder-like part of 330mm that automatic steel (SUM23L) workpiece is cut into diameter, then each cylinder-like part is all electroplated the nickel that thickness is about 4 μ m, to prepare a plurality of core materials that will use.Then, (trade name " V-PET1340QDLB ", average grain diameter are 25 μ m, and bulk density is 0.5g/cm to adopt polyester/epoxy powder coating material 3, make by Dai Nipon Toryo Co., Ltd) and (trade name " MORUNDAUM A ", average particle size particle size are 40 μ m, and bulk density is 1.95g/cm as powder coated material and aluminium oxide 3, make by Showa Denko K.K.) and as convexing to form powder.
(3) deposition of mixture of powders
The above-mentioned mixture of powders that contains powder coated material and convex to form powder is put in the fluid container as the electrostatic fluid coating apparatus in above-mentioned (1).Core material is carried by telpher conveyor, and their each free above-mentioned rotating mechanisms rotate simultaneously.Therefore, during by the cloud and mist in the fluid container, mixture of powders is deposited on each core material at core material.Each core material all is set to 20rpm and rotates.Air set under the pressure of 0.01Mpa blow out, under the pressure of 0.3Mpa, blow out from second discharge pipe 452 from first discharge pipe 451, under the pressure of 0.07Mpa from jet pipe 453 ejections.Each charged pin is provided-voltage of 35kV.
(4) cure and cool off
Pass the electrostatic fluid dipping system and make mixture of powders deposit to each lip-deep core material of core material, sent into continuously in the high-frequency induction furnace that high frequency is output as 20kHz (voltage 62V, electric current 65A) by telpher conveyor.Make each core material pass through this stove 40 seconds, so that make the surface temperature of core material rise to 230 ℃.Then, core material is admitted in the far ir ray generator, its design temperature is fixed to 200 ℃.Each core material is heated 2 minutes in the far ir ray generator by the far ir ray generator time.Then, by lead to the space that is provided with coating system (temperature: 30 ℃, humidity: Nei telpher conveyor (heat radiation part) 60%), by each core material radiations heat energy 4 minutes.Then, (each can be with 0.5m being provided with a cooler 3/ minute speed blow air) the space in each core material is further cooled off, reach 40 ℃ until the surface temperature of core material.Then, put down each core material that is coated with paint film (feed rollers) from telpher conveyor.
The assessment of the feed rollers of in example 1, making
Measure the thickness of the pressure layer of the feed rollers that so forms by non-contact laser scanning mircrometer gauge (model is " LSM-3100 ", is made by Mitutoyo company).As a result, pressing the thickness of layer is 32 ± 4 μ m, and the cylindricity of calculating according to aforementioned formula is 2-7 μ m.
[2] example 2
Adopt electrostatic fluid dipping system shown in Fig. 8 A and the 8B and spinning solution to make feed rollers
(1) general introduction of electrostatic fluid dipping system
Figure 11 is the typical front perspective view of the electrostatic fluid dipping system 4 of use in example 2.Electrostatic fluid dipping system 4 is identical with the equipment that uses in example 1, but has used the rotating mechanism shown in Fig. 8 A and the 8B in example 2.
(2) employed core material, powder coated material and convex to form powder
Use with example 1 in identical core material, powder coated material with convex to form powder.
(3) deposition of mixture of powders
The above-mentioned mixture of powders that contains powder coated material and convex to form powder is put in the fluid container of the electrostatic fluid coating apparatus described in above-mentioned (1).Carry this core material, they are rotated by above-mentioned rotating mechanism respectively simultaneously.Therefore, when core material was by fluid container, mixture of powders was deposited on each core material.Each core material is set to 20rpm speed and rotates.Air is blown out from first discharge pipe 451 under the pressure of 0.01Mpa, under the pressure of 0.3Mpa, blow out, under the pressure of 0.07Mpa, spray from jet pipe 453 from second discharge pipe 452.The charged pin 46 of each root is provided-voltage of 35kV.
(4) cure and cool off
Pass the electrostatic fluid dipping system and make mixture of powders be deposited on each surperficial core material of core material and cured, be cooled in the mode identical then with example 1 in the mode identical with example 1.Then, put down core material from the ground transport machine.
Assessment to the feed rollers of manufacturing in the example 2
Adopt non-contact laser scanning mircrometer gauge to measure the thickness of the pressure layer of the feed rollers that so forms.The result is that pressing the thickness of layer is 32.5 ± 7.5 μ m.The cylindricity of calculating according to above-mentioned formula is 0.5-8 μ m.
[3] example 3
Adopt electrostatic fluid dipping system shown in Fig. 9 A and the 9B and spinning solution to make feed rollers
(1) general introduction of electrostatic fluid dipping system
Figure 12 is the typical front perspective view of the electrostatic fluid dipping system 4 of use in example 3.Electrostatic fluid dipping system 4 is identical with the equipment that uses in example 1, but has used the rotating mechanism shown in Fig. 9 A and the 9B in example 3.
(2) employed core material, powder coated material and convex to form powder
Use with example 1 in identical core material, powder coated material with convex to form powder.
(3) deposition of mixture of powders
The above-mentioned mixture of powders that contains powder coated material and convex to form powder is put into the fluid container of the electrostatic fluid coating apparatus of above-mentioned (1).Core material is transferred, and they are rotated by above-mentioned rotating mechanism respectively simultaneously.Therefore, when core material passes through in the fluid container, mixture of powders is deposited on each core material.Core material is set to the speed rotation with 20rpm.Air is blown out from first discharge pipe 451 under the pressure of 0.01Mpa, under the pressure of 0.3Mpa, blow out, under the pressure of 0.07Mpa, spray from jet pipe 453 from second discharge pipe 452.Provide-voltage of 35kV for each charged pin 46.
(4) cure and cool off
Cure in example 1 identical mode and to pass the electrostatic fluid dipping system, then, it is cooled off in the mode identical with example 1 so that make mixture of powders be deposited on the core material of the respective surfaces of core material.Put down core material from ribbon conveyer then.
The assessment of the feed rollers of in example 3, making
Adopt non-contact laser scanning mircrometer gauge to measure the thickness of the pressure layer of the feed rollers that so forms.As a result, pressing the thickness of layer is 32.5 ± 7.5 μ m.The cylindricity of calculating according to above-mentioned formula is 0.5-8 μ m.
[4] comparison example 1
Under the non-rotary situation of core material, make feed rollers
Use core material, the powder coated material identical and convex to form powder with example 2.Use the electrostatic fluid dipping system identical, but core material does not rotate with example 2.Under the coating condition identical, be coated with example 2.Obtain feed rollers thus.
Assessment to the feed rollers in comparative example 1, made
Adopt non-contact laser scanning mircrometer gauge to measure the thickness of the pressure layer of each feed rollers that so forms.The result is that pressing the thickness of layer is 32.5 ± 25 μ m.The cylindricity of calculating according to above-mentioned formula is for being not less than 10 μ m.
[4] estimate
Clearly, compare with the feed rollers of making in comparison example 1 according to the feed rollers of the method manufacturing of any example among the routine 1-3, it presses the deviation of layer less.Equally clearly, compare with the feed rollers of making in comparison example 1 according to the feed rollers of any method manufacturing among the routine 1-3, its cylindricity is little, and the feed rollers of any one acquisition in routine 1-3 has the part of more approaching true circle.These effects are that the core material rotation obtains by making each workpiece.
In coating process of the present invention, when using the fluid dip-coating method, can be at the cylindrical work surface-stable and form simply and have the coated film of uniform thickness.In manufacturing feed rollers method of the present invention, can and form thickness simply at the surface-stable of core material and press layer uniformly.

Claims (3)

1. method of producing feed rollers may further comprise the steps:
To put into fluid container by the various powders that different materials is made, under various powders best cloud and mist formation condition separately, form a plurality of clouds and mists in the inside of fluid container;
In containing the fluid container of a plurality of clouds and mists, move a core material, so that make described core material coating go up various powders,
Wherein said various powders comprises powder coated material and convexes to form powder, the average grain diameter size (D of powder coated material D) and convex to form the average grain diameter size (D of powder f) ratio (D D/ D f) in 0.3 to 0.7 scope, and
Convex to form the average grain diameter size (D of powder f) in the scope of 5 to 250 μ m.
2. the method for production feed rollers as claimed in claim 1, the bulk density of wherein said various powders is 0.1 to 10g/cm 3Scope in.
3. as the method for any described production feed rollers among the claim 1-2, wherein: various powders is at least by powder coated material with convex to form powder combinations and constitute.
CN 01123464 2000-07-25 2001-07-25 Coating method, paper feed roller making method, feed rollers and coating apparatus Expired - Fee Related CN1283368C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2000224115A JP3889208B2 (en) 2000-07-25 2000-07-25 Method for manufacturing paper transport roller and paper transport roller manufactured by this method
JP224115/2000 2000-07-25
JP2000348312A JP4647082B2 (en) 2000-11-15 2000-11-15 Electrofluidic powder coating apparatus and method for manufacturing conveying roller
JP348312/2000 2000-11-15
JP2000349760A JP4729166B2 (en) 2000-11-16 2000-11-16 Coating method and manufacturing method of conveying roller
JP349760/2000 2000-11-16

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CN1283368C true CN1283368C (en) 2006-11-08

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JP4843085B2 (en) * 2009-12-07 2011-12-21 住友ゴム工業株式会社 OA roller and coating agent for OA roller
CN103042781B (en) * 2012-12-26 2015-07-08 武汉羿阳科技有限公司 Heat-insulating ceramic membrane and window membrane prepared from same
CN109013182A (en) * 2018-09-26 2018-12-18 衢州市川特电子科技有限公司 A kind of Drive And Its Driving Method of PLC Serve Motor Control rubber roller height
CN110626709A (en) * 2019-10-15 2019-12-31 东海县牡丹手套有限公司 Glove production conveying equipment

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