JP2925845B2 - Cleaning web for fixing roll and web roll thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing roll cleaning web for removing toner remaining on the surface of a fixing roll of an electrophotographic copying machine and applying a release agent, and a web roll thereof.

[0002]

2. Description of the Related Art Conventionally, as a cleaning web for removing a toner remaining on the surface of a fixing roll in a fixing device such as an electrophotographic copying machine, a nonwoven fabric containing an aromatic polyamide resin and a polyethylene terephthalate resin, a silicone oil or the like has been used. Is known (Japanese Patent Application Laid-Open No. 58-199371).

If the cleaning web can apply a large amount of release agent to the surface of the fixing roll, the copying speed can be increased, and if the copying speed is the same as the conventional one, a smaller cleaning web than the conventional one is applied. Since only the same amount of the release agent can be applied only by using the same, there is an advantage that it can be used for a long time.

Therefore, even if a large amount of the release agent is impregnated so that the cleaning web can apply a large amount of the release agent, the speed at which the cleaning web is unwound from the web roll is slow. Since it moves into the inside of the web roll, the cleaning web on the outer periphery is unwound without holding the release agent corresponding to the impregnated amount,
There is a problem that a large amount of release agent cannot be applied to the fixing roll.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a fixing roll cleaning web and a web roll capable of applying a large amount of release agent to the fixing roll. With the goal.

[0006]

The cleaning web for a fixing roll of the present invention comprises 30 to 70% by weight of heat-resistant fiber and 70 to 30% by weight of heat-fusible fiber. The cleaning web has A surface and B surface having different fiber surface areas, and the ratio (A / F) of the fiber surface area (A) of the A surface and the fiber surface area (B) of the B surface is different. B) is 0.7 or less .

[0007] The web roll of the present invention comprises a cleaning web having a larger fiber surface area than the cleaning web holding a release agent.
It is wound around a shaft with the surface inside.

[0008]

The cleaning web of the present invention has a ratio (A / B) of the fiber surface area (A) on the side A to the fiber surface area (B) on the side B.
Is 0.7 or less . Therefore, at the interface where the A surface and the B surface come into contact with each other when wound around the shaft, the B surface has a larger fiber surface area, so that a large amount of the release agent is easily held on the B surface. That is, as shown in FIG. 2, which is a partially enlarged view of the web roll 2 on which the cleaning web 1 is wound, an interface between the cleaning web 1 and the web roll 2 formed when the cleaning web 1 is unwound. Is that the release agent 3 moving from the outer peripheral cleaning web is agglomerated, and when the cleaning web 1 is wound around a shaft with the B side of the cleaning web 1 inside, at the interface, the unwound cleaning web side becomes B And the web roll side is A
Since the surface is a surface, the aggregated release agent 3 is mainly held on the surface B, that is, the unwound cleaning web, so that a large amount of the release agent 3 can be applied to the fixing roll.

The “fiber surface area” of the present invention is a value obtained by reducing the total fiber surface area of a certain volume by the thickness of a certain volume, and the total fiber surface area is based on the fiber radius obtained from the fineness and specific gravity. , Calculated from the fiber weight in a given volume.

Hereinafter, the cleaning web 1 and the cleaning roll of the present invention will be described based on a manufacturing method.

The cleaning web of the present invention uses a heat-resistant fiber which does not melt even when it comes into contact with a heated fixing roll in order to remove the toner on the surface of the fixing roll and apply a release agent to the fixing roll. Examples of the heat-resistant fiber include, but are not limited to, ortho- and para-based aromatic polyamide fibers, polyphenylene sulfide fibers, polyester fibers, and polyamide fibers. The fineness and fiber length of these heat-resistant fibers are not particularly limited, but fibers having a fineness of 0.5 to 5 denier and a fiber length of 5 to 150 mm can be suitably used.

Since these heat-resistant fibers alone have no strength, they are fused and fixed with heat-fusible fibers to provide strength. Examples of the heat-fusible fibers include, but are not limited to, undrawn polyester fibers and undrawn polyphenylene sulfide fibers. When these heat-fusible fibers are heated and pressurized, the molecules constituting the fibers rearrange, crystallize, and have excellent heat resistance, so that they can be suitably used. The fineness and the fiber length of these heat-fusible fibers are not particularly limited, either.
A fiber having 0 denier and a fiber length of 5 to 150 mm can be suitably used.

[0013] The heat-resistant fiber and the heat-fusible fiber are mixed, and a fiber web is formed by a dry method or a wet method using a card machine or the like, and then fused and fixed with the heat-fusible fiber by a calendar roll or the like. Obtained cleaning web. The fiber web may be a single layer, but if two or more layers of fiber webs having different mixing ratios of heat-resistant fibers are laminated and then fused and fixed with a heat-fusible fiber, the fiber between the surface A and the surface B A cleaning web having a surface area ratio (A / B) of 0.7 or less can be easily obtained.

When a cleaning web is obtained by laminating fiber webs, the mixing ratio of the heat-resistant fiber and the heat-fusible fiber contained in each fiber web is not particularly limited. The amount of the heat-resistant fiber contained in the entire fiber web to be obtained must be 30 to 70% by weight. If the amount of the heat-resistant fiber is less than 30% by weight, the heat resistance rapidly deteriorates, causing problems such as fusing.
If the content is more than 10% by weight, the strength of the cleaning web is lost and problems such as breakage occur. Similarly, in the case of a single layer, the amount of the heat-resistant fiber contained in the fiber web needs to be 30 to 70% by weight.

The ratio of the fiber surface area of the heat-resistant fiber in the fiber web located on the side A to the fiber surface area of the heat-resistant fiber in the fiber web located on the side B must be 0.7 or less. is there. In other words, when fusion-fixed with the heat-fusible fiber, the heat-fusible fiber does not maintain the fiber shape, but is mainly in the state of the resin solidified at the intersection of the heat-resistant fibers. It is necessary that the ratio of the fiber surface area of the heat-resistant fibers located on both sides be 0.7 or less .

The cleaning web 1 thus obtained has a ratio (A / B) of the fiber surface area (A) on the side A to the fiber surface area (B) on the side B of 0.7 or less. The cleaning web 1 unwound from 2 can hold many release agents 3. In addition, the ratio of A / B is 0.
It is more preferable that it is 5 or less because the holding property of the release agent 3 of the unwound cleaning web 1 is higher.

Although the basis weight and thickness of the cleaning web 1 of the present invention are not particularly limited, the cleaning web 1 can be accommodated in a casing of an electrophotographic copying machine, and the effects of removing toner and applying a release agent do not decrease. The basis weight is 15 to 40 g / m ² , and more preferably 20 to 40 g / m ² so that it can be used for a long time
At 30 g / m ² , the thickness is 30 to 120 μm, more preferably 40 to 75 μm.

After the release agent 3 is held by such a method as impregnating the cleaning web 1, it is wound around a shaft to obtain the web roll 2 of the present invention.

As the release agent 3 of the present invention, polysiloxane-based oils can be exemplified. Among them, polydimethylsiloxane has a good toner releasability and acts as a lubricating oil when it comes into contact with a fixing roll. Therefore, the surface of the fixing roll can be protected without being damaged, and the physical properties do not change even when it comes into contact with the high-temperature fixing roll.

The cleaning web 1 holding the release agent 3 is wound around a shaft. When the cleaning web 1 is wound around the shaft with the surface of the fiber having a large fiber surface area, that is, the surface B inside, as shown in FIG. When the cleaning web 1 is unwound, the surface that comes into contact with the release agent 3 agglomerated at the interface is the A side on the web roll side and the B side on the unwound cleaning web side. The release agent 3 is easily held on the wide surface B, and a large amount of the release agent 3 can be applied to the fixing roll.

The surface of the cleaning web 1 that comes into contact with the fixing roll may be either the A surface or the B surface, and is not limited.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the following embodiments.

[0023]

EXAMPLES (Example 1) Meta-based aromatic polyamide fiber (2 denier × 38 mm,
Specific gravity 1.38) 50% by weight and undrawn polyester fiber (5 denier × 38mm) 50% by weight were blended and opened by a card method, and a fiber web having a basis weight of 6.5 g / m ² (B fiber web). Are laminated, and a meta-based aromatic polyamide fiber (2 denier × 38 mm, specific gravity 1.3) is placed thereon.
8) 6.5 g / m2 of 20% by weight and 80% by weight of undrawn polyester fiber (5 denier x 38 mm)
^One fiber web (A fiber web) was laminated. The laminated fiber web is heated at a temperature of 217 ° C. and a linear pressure of 90 kg / c.
The cleaning web 1 having a basis weight of 26 g / m ² and a thickness of 65 μm, which was passed between calender rolls under the conditions of m and fixed by fusion with undrawn polyester fibers, was obtained. The meta-aromatic polyamide fiber was 42.5% by weight, the fiber surface area of side A was 1.6 × 10 ⁻² m ² / μm, and the fiber surface area of side B was 4.1 × 10 ⁻² m ^2. / Μm, A side and B side
The ratio of the surface to the fiber surface area (A / B) was 0.4.

After the cleaning web 1 was impregnated with 25 g / m ^{2 of} polydimethylsiloxane having a viscosity of 10,000 centistokes (CS) as a mold release agent, as shown in FIG. After winding, a web roll 2 of the present invention was obtained.

Example 2 Meta-based aromatic polyamide fiber (2 denier × 38 mm,
Specific gravity 1.38) and 30% by weight, consisting of 70 wt% undrawn polyester fibers (5 deniers × 38mm), except that laminated one sheet A fiber web having a mass per unit area of 6.5 g / ^{m 2,} the
In the same manner as in Example 1, the basis weight is 26 g / m ² , and the thickness is 6
A cleaning web 1 of 5 μm was obtained. The meta-aromatic polyamide fiber was 45% by weight, the fiber surface area on the A side was 2.5 × 10 ⁻² m ² / μm, and the fiber surface area on the B side was 4.1 × 10 ⁻² m ² / μm. And the ratio (A / B) of the fiber surface area between the A side and the B side was 0.6. Thereafter, in the same manner as in Example 1, the release agent 3 was adhered, and then wound around a shaft with the side B facing inside, to obtain a web roll 2 of the present invention.

[0026] (Comparative Example) except for laminating 4 sheets of identical B fiber web as in Example 1, in the same manner as in Example 1, basis weight 26 g / ^{m 2,} to obtain a cleaning web thickness 65 .mu.m. The meta-based aromatic polyamide fiber was 50% by weight, the fiber surface area on the A side was 4.1 × 10 ⁻² m ² / μm, and the fiber surface area on the B side was 4.1 × 10 ⁻² m ² / μm. And the ratio (A / B) of the fiber surface area of the A side and the B side was 1.0. afterwards,
In the same manner as in Example 1, after the release agent 3 was attached, the mold release agent 3 was wound around a shaft with the side B facing inside to obtain a web roll.

[0027] The (release agent retention measurements) web roll of Examples 1-3 and Comparative Examples, the winding speed of 2 mm / min, take-up torque 0.1 kgf / cm
And the cleaning web unwound for 2 m from the interface between the cleaning web and the web roll, and 2 m from the interface between the cleaning web and the web roll.
Minutes of unwound cleaning web. Then, the amount of polydimethylsiloxane retained on each cleaning web is extracted and measured with trichloroethylene. This operation is repeated five times to determine the amount of polydimethylsiloxane retained on each cleaning web. The results are shown in Table 1.

[0028]

[Table 1]

[0029] Thus, since the web roll of the present invention can retain a lot of the release agent than the conventional unwinding cleaning web, that can be applied a large amount of release agent to the fuser roll Recognize.

[0030]

According to the cleaning web for a fixing roll of the present invention, the ratio (A / B) of the fiber surface area (A) on the side A to the fiber surface area (B) on the side B is 0.7 or less , Is larger in the fiber surface area, so B
The release agent is easily held on the surface.

Since the web roll of the present invention is wound around a shaft with the surface B of the fixing roll cleaning web facing inside, the cleaning web for the fixing roll is formed when the cleaning web for the fixing roll is unwound. At the interface between the fixing roll and the web roll, the unwound fixing roll cleaning web side is the B surface and the web roll side is the A surface, so that the release agent agglomerated at the interface is removed from the unwound fixing roll cleaning web. And a large amount of release agent can be applied to the fixing roll.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of using a web roll.

FIG. 2 is an enlarged cross-sectional view of an interface between a web roll and an unwound cleaning web.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning web 2 Web roll 3 Release agent A A side B B side

Claims (2)

(57) [Claims] 1. A heat-resistant fiber of 30 to 70% by weight and 70 to 70% by weight.
A fixing roll cleaning web (hereinafter referred to as a cleaning web) comprising 30% by weight of heat fusible fibers and fixed by fusion with the heat fusible fibers, wherein the cleaning web has a surface A having a different fiber surface area, Surface B
(Hereinafter referred to as A side and B side), and the ratio (A / B) of the fiber surface area (A) of the A side to the fiber surface area (B) of the B side is:
A cleaning web for a fixing roll, wherein the cleaning web is 0.7 or less . 2. The web roll according to claim 1, wherein the cleaning web holding the release agent is wound around a shaft with the side B having a larger fiber surface area being inside.