JP3124429B2 - Pile felt for cleaning roll of toner fixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved pile cloth for a cleaning roll of a toner fixing device, and more particularly to a pile felt for a cleaning roll of a heat roller toner fixing device of an electrophotographic copying machine or the like.

[0002]

2. Description of the Related Art Conventionally, as a cleaning roll of a toner fixing device, a woven or knitted article, a paper-like article, a felt-like cloth wound on the roll surface, an article provided with a brush extending in a radial direction, a flocked article, and the like are known. Have been. However, a woven or knitted article, a paper-like article, a felt-like cloth, or the like has a high surface density and therefore a small capacity for containing the toner. In addition, the release agent on the surface tends to be clogged due to falling off, resulting in insufficient durability. On the other hand, a pile fabric for a cleaning roll of a toner fixing device, which is made of a pile fabric such as a brush or a moquette, and a flocked product, is also known. For example, “a cleaning roller of a fixing device that is in contact with the back surface of one of the fixing devices formed by pressing a heat roller and a pressure roller and that has a brush-like front surface and is driven to rotate” −
294474), "A fixing device for applying a release agent in a fixing device for heating and fixing a toner image to a copying material by passing the copying material on which a toner image has been formed between a fixing roller and a pressing roller pressed against each other. Japanese Patent Application Laid-Open No. 63-200177 discloses a release agent coating and cleaning apparatus characterized in that heat-resistant fibers are implanted on at least a part of the fluororesin porous body which is in contact with the roller. ,
These are very expensive in terms of cost, and have a problem in terms of durability such as dropping of fibers.

[0003] Furthermore, recently, especially the preservation of the global environment and the protection of forests have been called for, and recycled paper using recycled pulp has been used in many cases. Is significantly increased, and the durability of the conventional cleaning roll described above is greatly reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art. In other words, an object of the present invention is to provide a pile felt for a cleaning roll of a toner fixing device having a high durability, which has a high capacity for containing a toner, has less clogging due to detachment of a fiber itself or a release agent on the surface, and has high durability. To provide.

[0005]

The present invention relates to "<Claim 1> In a pile felt for a cleaning roll of a toner fixing device, a single yarn fineness of a pile yarn is 2 to 30 denier, a pile yarn length is 1 to 8 mm, and a pile yarn is Density 30,000 ~
60,000 de / cm ² and 50
% Or more is loop pile yarn and 50% of pile yarn
The above is the pile felt for the cleaning roll of the toner fixing device in which the pile is raised in the vertical direction with respect to the pile felt base cloth. <2> The pile felt for a cleaning roll of a toner fixing device according to <1>, wherein the pile yarn is made of a heat-resistant fiber. <Claim 3> The heat-resistant fiber is an aramid fiber.
A pile felt for a cleaning roll of the toner fixing device described in the above. <4> The pile felt for a cleaning roll of a toner fixing device according to <2>, wherein the heat-resistant fiber is a polyphenylene sulfide fiber. ".

Here, it is preferable to use heat-resistant fibers as the pile yarn. For example, polymetaphenylene isophthalamide, polyphenylene sulfide, polyethylene naphthalate, polyparaphenylene terephthalamide, polyimide, polyamideimide, polyetheretherketone, polyethersulfon, etc. It has the above heat resistance.

In the present invention, it is necessary that at least 50% of the naps are loop pile yarns, and at least 50% of the pile yarns are naps perpendicular to the pile felt base fabric. More than 50% of the standing hair is loop pile yarn,
When 50% or more of the pile yarns are not raised in the vertical direction with respect to the pile felt base cloth, the capacity for containing the toner is low, and the fibers themselves are likely to fall off. The durability as pile felt is low.

Next, single yarn fineness, pile yarn length, and pile yarn density are important. The single yarn fineness is preferably 2 to 30 denier, more preferably 5 to 20 denier. If the single-filament fineness is less than 2 denier, the pile has a large settling and the effect of removing toner, paper dust and the like is insufficient. If the single yarn fineness exceeds 30 denier, the pile yarn density of the felt decreases, and the cleaning effect also decreases. The pile yarn length is preferably 1 to 8 mm, more preferably 2 to 6 mm.
When the pile yarn length is less than 1 mm, the cleaning durability is low, and when the pile yarn length exceeds 8 mm, the pile is severely set and the cleaning effect is poor.

The pile yarn has a density of 30,000 to 60,0.
00 de / cm ² is preferred. The pile yarn density is 30,
If it is less than 000 de / cm ² , the cleaning property is insufficient. If the density of the pile yarn exceeds 60,000 de / cm ² , problems arise in terms of the limit of the needle density and the productivity.

The raising of the pile felt can be performed by a random velor needle punch method or a counit method. The pile yarn length and the pile yarn density can obtain predetermined numerical values by adjusting the punch density and the needle depth. The pile yarn shape depends on the selection of the needle. In the case of a fork needle, it can be adjusted to a cut shape. Although both shapes can be used for the cleaning roll of the toner fixing device, a loop shape is preferable from the viewpoint of pile yarn durability.

The pile felt is wound around a fixing roll in a roll shape, and a release agent is applied to the pile portion. It is also possible to enclose silicone oil, which is usually used as a mold release agent, in the roll core, so that the silicon oil is continuously supplied to the pile felt through the small holes of the core. The release agent preferably has a viscosity of about 100 to 200,000 cps. More preferably, 1000 to 10
It is about 000 cps. The type of the release agent is not particularly limited. Usually, a silicon resin is often used.

A resin is applied to the pile felt from the back surface to prevent the fluff from falling off and to substantially fix the fluff. As the resin, a thermoplastic resin such as polyurethane or polyacrylonitrile or a thermosetting resin such as phenol, epoxy or melamine which is usually used for fiber processing can be used. The method of applying the resin may be a method generally used in resin processing of a fabric, such as roller coating or knife coating.

[0013]

The pile felt for the cleaning roll of the toner fixing device of the present invention has a high capacity for containing the toner, and has little clogging due to detachment of the fiber itself or detachment of the release agent on the surface. High in nature.

[0014]

EXAMPLES Hereinafter, a method for producing a pile felt for a cleaning roll of the present invention will be described with reference to examples. In addition, the evaluation method in the Example was performed by the following method. <Ratio of Loop Pile Yarn> An electron microscope cross-sectional photograph of the pile felt for the cleaning roll was taken, the number of pile yarns and the number of loop pile yarns were read, and the ratio of the loop pile yarn to the number of pile yarns was calculated. <Measurement of Verticality of Loop Pile Yarn> In the electron micrograph of the cleaning roll pile felt, the number of vertically piled loop pile yarns was read, and the ratio of the vertical loop pile yarn to the number of loop pile yarns was calculated. <Loop Curvature Radius of Loop Pile Yarn> In the electron micrograph of the cleaning roll pile felt, the loop curvature radius of the loop pile yarn was measured (n = 20, unit mm). <Possible number of copies> The number of copies until the dirt was recognized by actually repeating copying with a copying machine was recorded. <Toner conjugation capacity> The toner is sufficiently placed on the pile felt for the cleaning roll, passed through the contact pressure roller, and then shaken off by applying vibration. Then, the weight is measured, and the weight of the cloth before the toner is loaded is obtained. The ratio of the increase in weight to was calculated. <Pile Yarn Shedding Rate> A load of 50 g / cm ² was applied to an adhesive tape (2.5 cm × 5 cm), and the number of fibers adhered to the adhesive tape was compared. <Surface Percentage of Release Agent> One drop of silicone having a viscosity of 10,000 was dropped on a pile fabric for a cleaning roll, and the permeation speed was compared.
は is good (comparative example 3 relative transmission speed), Δ is slightly good (comparative example 3 comparative transmission speed), × (comparative example 3 transmission speed)

Example 1 Polymetaphenylene isophthalamide short fiber (PMIA) having a single yarn fineness of 10 denier and a fiber length of 76 mm was supplied to a turbo feeder, and a blender, a hopper feeder,
Spread through roller card and cross layer 10
The layers were laminated so as to have a basis weight of 0 g / m ² . Then 20P / cm ² conducted Purepanchi, after further predetermined amount punching, using a fork needle at random velor needle punching machine to implement punching 400P / cm ^2, 80 of the pile yarn pile length 4mm The conditions were set such that% was a loop pile and 60% of the pile yarns were raised in the vertical direction. After that, a polyurethane resin was applied from the back surface at 30 g / m ^{2 by} a roller coating method, followed by drying and curing. The obtained pile felt was adhered to the surface of a roll having a diameter of 20 mm and a length of 310 mm to form a cleaning roll.
400 g / m ^{2 of 0} cps silicone resin was applied.
Using the obtained cleaning roll, a copy number test was carried out. The result was about 170,000 sheets, showing about three times the copy performance as compared with the conventional product. The evaluation results are shown in Tables 1 and 2.

[Examples 2 to 3] In Example 1, the pile yarn density was changed as shown in Table 1 by changing the punching density, single yarn fineness, pile yarn length, and the like.
Various pile fabrics for cleaning rolls were prepared and evaluated. The results are shown in Tables 1 and 2.

[Comparative Example 1] Polymetaphenylene isophthalamide short fiber having a single yarn fineness of 10 denier and a fiber length of 76 mm was supplied to a turbo feeder, opened through a blender, a hopper feeder, and a roller card, and opened with a cross layer. The layers were laminated so as to have a basis weight of 420 g / m ² . Then pre-punch 20P
/ Cm ^2, and punching was performed up and down at 400 P / cm ² to produce a pile felt having a basis weight of 300 g / m ² . In the obtained pile felt, 40% of the pile yarn was a loop pile, and 50% of the pile yarn was napped in the vertical direction. A cleaning roll was formed in the same manner as in Example 1, and a silicone resin was adhered in the same manner. Using the obtained cleaning roll, a copy number test was performed, and the result was about 50,000 copies.

[Comparative Examples 2 to 8] In Example 1, the pile yarn density was changed as shown in Table 1 by changing the punching density, single yarn fineness, and pile yarn length, and various pile fabrics for cleaning rolls were prepared. evaluated. The results are shown in Tables 1 and 2.

[0019]

[Table 1]

[0020]

[Table 2]

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-214635 (JP, A) JP-A-5-214667 (JP, A) JP-A-49-77638 (JP, A) 6122 (JP, A) Fully open sho 64-17555 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03G 15/20 D03D 27/00 D05C 17/00

Claims (4)

(57) [Claims] In a pile felt for a cleaning roll of a toner fixing device, a single yarn fineness of a pile yarn is 2-3.
0 denier, pile yarn length of 1 to 8 mm, pile yarn density of 30,000 to 60,000 de / cm ² ,
A pile felt for a cleaning roll of a toner fixing device in which 50% or more of the pile yarn is a loop pile yarn, and 50% or more of the pile yarn is raised in a direction perpendicular to a pile felt base fabric. 2. The pile felt for a cleaning roll of a toner fixing device according to claim 1, wherein the pile yarn is made of a heat-resistant fiber. 3. The heat-resistant fiber is an aramid fiber.
A pile felt for a cleaning roll of the toner fixing device described in the above. 4. The pile felt for a cleaning roll of a toner fixing device according to claim 2, wherein the heat-resistant fiber is a polyphenylene sulfide fiber.