JPH0811421B2 - Method for producing fluorine resin coated roller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a fluororesin-coated roller used in a fixing device of an electronic copying machine.

(Technical background of the invention) Conventionally, when a roller for a fixing device is manufactured, a fluorocarbon resin is electrostatically powder-coated on a cored bar whose surface is coated with a primer in advance or on the cored bar via fluororubber or silicone rubber. Spray coating, dip coating, or roll coating, followed by firing, cooling, recoating, and further firing and cooling are repeated.

However, such a conventional manufacturing method has the following problems.

(1) Fluorine resin firing is 0.5 to 1.5 in a high temperature atmosphere.
As it is performed for a long time, the primer or rubber becomes brittle or decomposed gas is generated due to oxidation or heat deterioration,
Pinholes are easily generated in the fluororesin film, the mechanical strength of the roller is reduced, and the outer diameter of the fluororesin film is reduced or deformed after long-term use, resulting in deterioration of the releasability of the fluororesin film.

(2) It is difficult to make the film uniform, grinding is required, and grinding loss occurs.

(3) If foreign matter adheres to the film before or during firing, that portion will become a defect portion, and quality deterioration is likely to occur, and reliable dustproof control is necessary to prevent them.

(4) Equipment for treating sublimate and corrosive gas generated during firing is required.

(5) Since it is necessary to keep the core shaft of the roller and the rubber layer at a temperature close to or higher than the melting point of the fluororesin, it takes time and cost.

In addition to this, it is possible to coat the fluororesin as a heat-shrinkable tube, but (1) the adhesive strength is low and it is difficult to make the adhesive strength uniform. (2) It is difficult to thin the fluororesin film. (3) In particular, in the case of an inverted crown type roller, defects are likely to occur because wrinkles and air are likely to be contained therein. (4) Since the strain at the time of tubing remains in the fluororesin film, there is a drawback that the outer diameter tends to vary.

(Object of the Invention) The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a method for manufacturing a fluororesin-coated roller which is capable of stabilizing quality and improving productivity.

Embodiments of the Invention Embodiments of the present invention will be described below with reference to the drawings. First
The figure schematically shows an embodiment of the present invention.

The film-forming plate 1 includes a preforming zone l ₁ having a heater 2, a fusion or adhesion zone l ₂ having a heater 3, and a cooling mechanism 4.
It consists of three zones of cooling and release zones l ₃ having, on the pre-forming zone l ₁ fluororesin film 5 made of a fluorine resin film or a fluorine resin powder is placed.

Further, the core metal 6 is placed on the fluororesin film 5. The surface material of the film forming plate 1 is formed of a material having a good releasability from the fluororesin film 5 such as hard chrome plating, stainless steel, nitride steel, ceramics and fluororesin coating or heat resistant rubber. Then, the fluororesin film 5 is wound around the core metal 6 to form a fluororesin-coated roller.
Subsequently, the fluororesin-coated roller is rolled along the film-forming plate 1 to the fusion or adhesion zone l ₂ , where the fluororesin film is fused or adhered to the core metal, and then the cooling release zone l ₃ And is cooled and released from the surface of the film forming plate 1.

Although not shown, a constant pressure is applied to the roller.

In this way, the fluororesin-coated roller is manufactured.
In this example, the fluororesin layer was provided directly on the outer circumference of the core metal, but it is also possible to provide the fluororesin layer via the rubber elastic layer, and the fluororesin film is formed on the outer circumference of the core metal in the preforming zone. Although coated, it is also possible to coat the fluororesin tube in advance before placing it on the film-forming plate. Further, it is preferable that the temperature distribution of the film forming plate shows a curve as shown in FIG.

(Effects of the Invention) As described above, according to the method for manufacturing a fluororesin-coated roller of the present invention, the following effects can be obtained.

(1) A fluororesin-coated roller with consistently constant quality and performance can be obtained.

(2) Productivity is greatly improved.

(3) Since the baking process is not performed, there is no deterioration of the rubber or primer in the lower layer, there is no pinhole in the film, there is no unevenness of the film due to the adhesion of foreign matter, the surface roughness of the film is small, and the equipment cost is low. End

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment according to the present invention, and FIG. 2 is a diagram showing a temperature distribution of a film-forming plate corresponding to FIG. 1 ... Film-forming plate 2, 3 ... Heater 4 ... Cooling mechanism 5 ... Fluororesin film 6 ... Core metal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuka Yamakami, Inventor Yuka Yamada, 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Showa Electric Wire & Cable Co., Ltd. (72) Yuji Suzuki, Sakae Oda, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1-1 No. 1 Showa Electric Cable Co., Ltd.

Claims (2)

[Claims] 1. A roller core metal is placed on one end of a film-forming plate and moved while rotating to manufacture a fluororesin-coated roller, which has a heater and a fluororesin film is formed on the film-forming plate. In the arranged pre-molding zone, the outer periphery of the roller core metal is coated with the fluororesin film, and then, in the fusion or adhesion zone having a heater, further heating is performed to fuse the fluororesin film to the outer periphery of the roller core metal or Glue and then
A method for producing a fluororesin-coated roller, which comprises cooling the roller and releasing the roller from a film-forming plate in a cooling zone having a cooling mechanism. 2. A fluorocarbon resin-coated roller is manufactured by placing a roller cored bar previously coated with a fluororesin film in a non-adhesive state on one end of a film-forming plate and moving it while rotating it.
In a preforming zone having a heater, the fluororesin film is heated to temporarily adhere to the outer periphery of the roller core metal, and then,
In a fusion or adhesion zone having a heater, further heating to cause the fluororesin film to be fused or adhered to the outer periphery of the roller core metal, and then in a cooling zone having a cooling mechanism,
A method for producing a fluororesin-coated roller, which comprises cooling the roller and releasing it from the film-forming plate.