JPS5953872A - Transfer material - Google Patents

Abstract

PURPOSE:To obtain a copy image which is free of a transfer omission and transfer unevenness, by providing an insulating and oil absorbent area to the gripped part of a film with <=10<8>OMEGA surface resistance. CONSTITUTION:A transfer material 3 for a color picture consists of a conductive surface 1 and a polyester film base 2. When a high insulating member other than paper is used as a grip part 4, all cases (a)-(d) are applicable and the part is gripped at the grip part 10 of a transfer drum 7. When te grip part 4 is paper, the sticking (b) of a base-side leading end, sticking (c) using the insulating layer, or the case (d) wherein an insulating tape 6 is used is applied. The grip part 4 is made of paper, unwoven fabric, or a porous plastic film to obtain an oil absorbent rough surface, and excessive silicone oil is absorbed after passing through nips of a heat roll couple to reduce the adhesive strength because of the rough surface, facilitating separation from a pressure roll.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transfer material used in a transfer type image forming apparatus, and in particular used in a multi-transfer type transfer apparatus having a transfer material holding member area equipped with a transfer material gripping means. It is a transfer material. Then, this transfer material transfers a color toner image formed in, for example, a color electronic copying device to a transfer material having a nine-hole insulating base of 0HP (OHP) film, and fixes it by heat roller fixing or the like. suitable for use in forming color images.

The applicant has previously eliminated the drawbacks of a transfer cloth suitable for use in multiple transfer type image forming apparatuses, particularly color copying apparatuses. That is, the problem was solved by increasing the capacity of the copying material when separating the insulating transfer material from the photoreceptor due to the presence of this conductive layer. When the transfer material provided with this conductive layer is used in a multiple transfer type image forming apparatus, particularly a color copying apparatus, it is possible to obtain a high quality multiple transfer image without transfer unevenness. However, depending on the conditions of this transfer material holding means, the following problems may occur.

The first problem is as follows. In other words, a transfer material holding member, ie, a transfer drum, in a transfer device of a multiple transfer type image forming apparatus such as a color copying device is used to hold the leading edge of the transfer material to prevent the transfer material from shifting during multiple multiple transfer processes. A metal clipper is provided as a material gripping means. If the surface of the transfer material is conductive as described above, the surface of the transfer material will pass through the ripper and become grounded (hereinafter referred to as a leak state), and the transfer charge on the back surface of the transfer material will be blocked, and part or all of the image will be A so-called transfer failure phenomenon occurs in which the image is not transferred or the image density is reduced. In transfer materials with a surface resistance of 10 Ω or more, such as transfer materials coated with conductive resin on the surface of the transfer material, transfer defects only occur near the ripper.
For example, when a semiconductor thin film is provided on the transfer surface, the surface resistance is 10
In a transfer material having a conductive surface of Ω or less, transfer voids do not remain in the vicinity of the silica, but often occur over the entire surface of the transfer material because of the high degree of freedom of charge movement on the surface of the transfer material. Even if an insulating resin is coated on the surface of the metallic silica to prevent leakage, it is not possible to completely prevent leakage from the caltrop holes, and the durability of the coating film is also poor. There is a drawback.

In addition, it is difficult to construct the silicon bar itself from a plastic material and insulate it from the standpoint of accuracy or strength of the device. The second problem that is undesirable is to apply a bias voltage to a metal silicate bar to prevent leakage because it makes the device complicated and expensive. be. Conventionally, when fixing a color toner image with a heat roller, the amount of silicone oil applied to the heat roller pair to prevent toner offset is as follows:
General black toner.

It is necessary to use an amount several times or more of the amount applied when fixing the image with a heat roller. This is because color toner is colored by heating and melting, so resins with a low melting point and high adhesiveness are generally used.Full-color images also require three times as much toner adhesion time as heavy-color images. This is due to the fact that there is. In this way, when fixing a color toner image with a heat roller, a large amount of silicone oil is applied to prevent toner offset, so when fixing a transfer material based on a polyester film, Heating D-ra of cola etc. and pressurizing D-ra of def.
- When the transfer material passes through a pair of rollers consisting of a roller, the gap between the front surface of the pressure roller and the back surface of the transfer material is filled with oil, and the transfer material is brought into close contact with the pressure roller, and heated. When the transfer material is softened, a force acts on the pressure roller side to curl the transfer material, making it difficult to separate the transfer material even with the action of the separating claw, and jams are likely to occur.

In view of the above-mentioned problems, an object of the present invention is to prevent transfer omission even when held by a clipper.

Furthermore, it is an object of the present invention to provide a new transfer material that is less likely to adhere to wax during thermal fixing.

The transfer material according to the present invention is a transfer material used in a transfer device having a transfer material holding member equipped with a transfer member gripping means, and is gripped by the above transfer material gripping means in a film having a conductive surface with a surface resistance of 10Ω or less. In the part where
It is characterized by providing a gripped region that is insulating and oil-absorbing. The above-mentioned insulating and oil-absorbing gripped area may be made of paper, polyester, polyester, etc.
Non-woven fabrics made of fibers such as caltrop, boria, etc., or porous insulating plastics, films, etc. (hereinafter referred to as "paper, etc.") are used for the vagina. The thickness of these papers may be approximately the same as that of the above film. Paper or the like is pasted on at least one side of the film using an adhesive or double-sided adhesive.

In addition, when the insulating and oil-absorbing member of the present invention is made of a material other than paper, it is necessary to have heat resistance to the extent that it does not become extremely soft or deformed by hot roller fixing.

FIGS. 1(a) to 1(d) respectively show several embodiments of the present invention. In these embodiments, the transfer material comprises a film 3 having a conductive surface 1 formed on a polyester film substrate 2 and a paper or the like 4 connected to the leading edge of the film.

In FIG. 1(a), paper or the like 4 is adhered to the tip of the film 3 on the conductive surface 1 side. However, when using paper as the paper etc. 4, use low humidity (temperature 15C1 relative humidity 11 (2C1
) Sometimes the volume resistance is about 310 Ω・(7), which is no problem, but it is common (at a temperature of 20
C1 relative humidity 50%) or high humidity (35% relative humidity)
Sometimes the volume resistivity is about 10 Ω・α and about 10 Ω, respectively.
・This is a problem because it deteriorates the image quality and tends to leak into the green soba through the resistance of the paper, especially when it is humid.

Therefore, when paper is used as the paper 4, it is necessary to attach it to the tip of the film 3 on the substrate side as shown in FIG. 1(b) in order to obtain a good transferred image in all environments.

However, even when using paper, if a thin insulating layer 5 is provided at the tip of the conductive surface 1 as shown in FIG. .

Fig. 1(d) shows that by placing a small amount of wire between the end face of the film 3 and the end face of paper etc. 4, and gluing an insulating film 6 such as polyester film on both sides.
This is an example in which paper or the like 4 is connected to the leading end of the film 3.

Needless to say, if a highly insulating material such as fiber cloth such as polyester other than paper is used as the paper etc.
) to (d) Any of the configurations may be used.

FIG. 2 is a perspective view of a transfer material according to the present invention and a transfer drum 7 which is a transfer material holding member of a color copying apparatus. The transfer drum 7 has a large notch.A polyester mesh screen 9 of approximately 80 mesh is wrapped around the notch of an aluminum syringe 8. A metal sill bar 10 is provided to hold the tip of 3. Further, a discharge device 11 is provided inside the cylinder 8 to face the surface of a toner image carrier (not shown) for transferring images. Remove the transfer material from the tip of the paper by ripper 1.
It is held at 0 and wound around the transfer drum, and the rotation of the transfer drum is held at n? A toner image on a toner image carrier (not shown) is transferred thereto.

The paper, nonwoven fabric, or porous plastic film described above has oil absorption properties and has a rougher surface than polyester film, so when fixing is performed using a heated roller, it is necessary to After passing, the paper absorbs excess silicone oil and the surface roughness of the paper creates an air layer between the back surface of the paper and the surface of the pressure roller, reducing adhesion. This makes it easy to separate the paper or the like from the pressure roller.

J'J, J: As described, according to the present invention, when used in a multi-transfer type image forming apparatus such as a color electrophotographic copying apparatus 0 having a transfer material holding member equipped with a transfer material holding means, the transfer material can be transferred. Enables high-quality transfer image formation without omissions or uneven transfer. Furthermore, in the case where thermal 0-La fixing is carried out at the same time, a transfer material that can prevent the transfer material after fixing from adhering to the 0-La and thus jamming can be obtained.

[Brief explanation of the drawing]

FIGS. 1(a) to d) are sectional views showing several embodiments of the transfer material according to the present invention, and FIG. 2 is a perspective view of the transfer material and a transfer drum of a color electrophotographic copying device or the like. It is.

Claims (1)

[Scope of Claims] 1. A transfer material used in a transfer device having a transfer material holding member that is equipped with a transfer material gripping means and has a surface resistance of 10Ω.
A transfer material, characterized in that a gripped region having insulating and oil-absorbing properties is provided in a portion of a film having the following conductive surface that is gripped by the above-mentioned transfer material gripping means. 2. The transfer material according to claim 1, wherein the gripped region is made of paper attached to one edge of the film.