JP2936243B2 - Cleaning roll material for fixing roll of copier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning roll material for a fixing roll of a copier (hereinafter referred to as a fixing roll) which can be suitably used for a heat fixing roll for fixing an unfixed image in an image forming apparatus such as a PPC copier and a laser beam printer. , A cleaning roll material).

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a PPC copying machine or a laser beam printer, a nonwoven web cleaning roll material moving between a supply unit and a winding unit is pressed against the surface of the fixing roll. Thus, there is known an apparatus in which toner remaining on the heat fixing roll is wiped and removed. Also, by impregnating the cleaning roll material with silicone oil, the silicone oil is supplied onto the fixing roll when the heating fixing roll is wiped, so that the releasability of the toner and paper from the fixing roll is improved. Is also known.

[0003]

Since the cleaning roll material is strongly pressed against the surface of the fixing roll by the pressing roll, there is a possibility that the surface of the fixing roll may be damaged when the toner is wiped. In addition, as the amount of recycled paper used increases due to resource savings, not only toner,
It is also necessary to take measures against paper dust remaining on the fixing roll. In recent years, there has been a problem that a copy image is stained by paper dust remaining on the surface of the fixing roll.

Accordingly, an object of the present invention is to provide a cleaning roll material for a fixing roll of a copying machine which can easily remove toner and paper powder remaining on the fixing roll without damaging the fixing roll. .

[0005]

According to the present invention, a pressure-sensitive collapsible inorganic microcapsule containing a silicone adhesive is supported on a nonwoven web impregnated with silicone oil.

The above-mentioned microcapsules have a shell wall made of an inorganic material and having a diameter of 1 to 20 μm. In a microcapsule having a diameter of less than 1 μm, the amount of the silicone-based pressure-sensitive adhesive contained is small, and the adhesive force sufficient to collect the toner and paper powder on the fixing roll cannot be given to the fixing roll. In the case of microcapsules having a diameter of more than 20 μm, disintegration causes an excessive supply of silicone-based pressure-sensitive adhesive to be supplied onto the fixing roll. Shortage and not preferred. Note that microcapsules having a diameter of 5 to 10 μm are particularly preferable in view of the dispersibility and adhesion effect of the silicone-based pressure-sensitive adhesive and silicone oil on the surface of the fixing roll.

The above silicone oil has a viscosity of 3
Dimethyl silicone oil of 000 to 30,000 centistokes (cs) is optimal from the viewpoint of the releasing effect.

[0008] Further, it is required that the nonwoven fabric web is made of a mixed fiber of a heat-resistant synthetic fiber such as an aromatic polyamide fiber, a 4-6 nylon fiber, or a carbon fiber and an undrawn synthetic fiber, so that heat resistance is required. It is preferable for a cleaning roll material.

The present invention also provides a pressure-sensitive collapsible inorganic material.
Icrocapsule is 0.5kg / m ^Two ~ 2.0kg / m
^Two It is characterized by collapse by pressure of

When the microcapsules disintegrate under a pressure of less than 0.5 kg / m ² , only the silicone-based pressure-sensitive adhesive is supplied to the surface of the fixing roll, and the supply of silicone oil for releasing is insufficient, which is not preferable. Also, 2.
When disintegrated by a pressure exceeding 0 kg / m ² , the fixing roll may be damaged, which is not preferable.

[0011]

According to the present invention, when the cleaning roll material is pressed against the surface of the fixing roll by the pressing roll, the pressure-sensitive collapsible microcapsules are collapsed, and the encapsulated silicone adhesive is supplied onto the fixing roll. At the same time, silicone oil for releasing the mold is also supplied onto the fixing roll. That is, the pressure-sensitive adhesive roller transfers the silicone-based pressure-sensitive adhesive and silicone oil to the surface of the fixing roll at the same time as the sea-island shape on the surface of the cleaning roll material. That is, a portion containing a silicone oil for promoting the releasability of toner and paper dust and a portion containing a silicone-based adhesive for sticking and collecting the toner and paper dust are formed on the fixing roll surface. It is formed. Therefore, the collection of paper dust accompanying the use of recycled paper or the like can be effectively performed by the silicone-based adhesive, and the collection effect of the toner and paper powder is maintained even when the pressure of the pressing roll is set relatively low. Therefore, the surface of the fixing roll is not damaged by the pressure of the pressing roll.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a cleaning roll material showing one embodiment of the present invention, and FIG. 2 is a perspective view of a cleaning roll formed by the cleaning roll material. FIG. 3 is a conceptual diagram showing a use state of the cleaning roll.

Fineness: 1.25 denier, cut length 38 mm
Conex fiber (Aromatic polyamide fiber: Teijin)
60% by weight, fineness 2.5 denier, cut length 38mm
Of non-drawn polyester fibers (manufactured by Toray Industries, Inc.) of 40% by weight was formed into a parallel web by a known web forming machine, and heated and pressed at a linear pressure of 45 kg / cm by a pair of flat rolls heated to 200 ° C. , Basis weight 27g /
A heat-sealed nonwoven fabric sheet 1 having an m ² and a thickness of 50 μ was obtained. To this nonwoven fabric sheet 1, 30 pieces of silicone oil having the following composition are added.
g / m ² .

Solid ratio Dimethyl silicone oil (viscosity 10,000 cs) 100 (Shin-Etsu Chemical: KF96H) Silicone varnish (Shin-Etsu Chemical: KR120) mixed 7 mm in diameter pressure-sensitive collapsible microcapsules (Matsumoto Yushi) 10

As described above, the silicone oil (for example, dimethyl silicone oil) 2 for releasability uniformly penetrates the surface of the heat-sealed nonwoven fabric sheet 1 and the silicone-based adhesive (for example, silicone varnish) 3 is applied. The cleaning roll material 5 of the present example in which the encapsulated pressure-sensitive collapsible microcapsules 4 were uniformly dispersed was formed.

(Comparative Example) 30 g / m ² of dimethyl silicone oil having a viscosity of 10,000 centistokes was impregnated and adhered to the heat-sealed nonwoven fabric sheet 1 obtained in the above example.
A cleaning roll material of a comparative example was formed.

A test was performed using the cleaning roll materials of the above-described Examples and Comparative Examples. That is, the cleaning roll material 5 of the embodiment is wound around the shaft 6 by a predetermined amount, the winding roll 8 is attached to the end, and the cleaning roll 7
Was formed. The cleaning roll material of the comparative example was also a cleaning roll. As shown in FIG. 3, the cleaning roll member 5 was set on the cleaning mechanism of the copying machine such that the pressing roll 11 was pressed against the surface of the fixing roll 10. At this time, the pressure of the pressing roll 11 was 1.5 kg / m ² , and 10,000 sheets of recycled paper were copied. Table 2 below shows the results of a visual comparison of fixing roll stain, copied image stain, and cleaning effect. In addition, this evaluation is represented by five levels,
The higher the value, the better.

[0018]

[Table 1]

In the above-described cleaning mechanism, the fixing roll 10 presses and fixes the toner 12 held on the document 14 between the fixing roll 10 and the backup roll 13. In addition, 1 in the figure
5 is paper dust remaining on the surface of the fixing roll 10, and 16 is the remaining toner.

When the cleaning roll material 5 of the embodiment is used, as shown in FIG.
The silicone varnish 3 in the microcapsule 4 and the dimethyl silicone oil 2 in the microcapsule 4 that have collapsed due to the pressure
Was released from the surface of the fixing roll 10 by the dimethyl silicone oil 2 and the silicone varnish 3 transferred from the surface of the cleaning material 5 to the surface of the fixing roll 10, and was completely collected by the adhesive action. On the other hand, when the cleaning roll material of the comparative example was used, paper dust 15 and residual toner 16 could not be completely collected.

The cleaning roll material was used as a cleaning roll under the same processing conditions as in the embodiment.

[0022]

As described above, according to the present invention, residual toner adhering to the surface of a fixing roll and paper dust generated when recycled paper is used as copy paper can be effectively wiped off. . Further, since the pressing pressure of the pressing roll can be set relatively low as in the related art, it is possible to prevent the fixing roll surface from being damaged.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a cleaning roll material for a fixing roll of a copying machine according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a cleaning roll formed by a cleaning roll material.

FIG. 3 is a conceptual diagram illustrating a use state of a cleaning roll.

FIG. 4 is a partially enlarged plan view of the surface of a cleaning roll material during cleaning.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat-fused nonwoven fabric sheet 2 dimethyl silicone oil (silicone oil) 3 silicone varnish (silicone-based adhesive) 4 pressure-sensitive collapsible microcapsule 5 cleaning roll material 6 shaft 7 cleaning roll 8 winding roll 10 fixing roll 11 pressing roll 12 Toner 13 Backup roll 14 Original 15 Paper dust 16 Residual toner

Claims (2)

(57) [Claims] 1. A cleaning roll material for a fixing roll of a copying machine, wherein a non-woven web impregnated with silicone oil carries a pressure-sensitive collapsible inorganic microcapsule containing a silicone adhesive. ^2. The cleaning roll material for a fixing roll of a copying machine according to claim 1, wherein said pressure-sensitive collapsible inorganic microcapsules collapse by a pressure of 0.5 kg / m ^{2 to} 2.0 kg / m ² .