JPS5980363A - Application method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coating method, and more particularly, to a coating method for coating a coating film having an internal space.
'JK Concerning a method of coating cloth.

Coating by dipping has been widely practiced. The method is basically to add 1 layer to the paint.
The liquid is applied to the surface of the object by attaching it to the liquid and then lifting the object out of the liquid at a suitable speed. In the case of coating by the dipping method, a uniform coating film can be obtained by appropriately setting the coating conditions such as the viscosity of the coating material and the pulling speed according to the shape of the object to be coated.

In this coating method, when the object to be coated is cylindrical and hollow inside, such as an electrophotographic photosensitive drum, it is necessary to prevent the paint from adhering to the inside of the object. To prevent this, it is necessary to close the inner space of the object to the paint by closing the lower end or the upper end of the object. However, the method of coating by closing the bottom end of the object to be coated using some kind of auxiliary device such as a bottom lid does not allow for the generation of air bubbles caused by the auxiliary device, uneven thickness due to the step between the object and the object to be coated, and the loss of the coating film due to attachment and detachment. It is easy to cause paint film defects due to dust generation, etc., and it is necessary to prepare auxiliary equipment for the number of coatings, and even if 11j is used, it is necessary to remove 6Lfp of the paint film attached to the auxiliary equipment, which reduces productivity. In2
There is a problem.

On the other hand, the method of coating by closing the upper end of the object to be coated is
Although the above disadvantages are solved, due to the slight temperature difference between the paint and the outside air temperature, the inside of the object to be coated (<11) may expand, or the solvent of the paint may evaporate inside the object, increasing the volume. Bubbles often form from below during lifting.When such bubbles appear, the paint thickens and swells, causing uneven coating and making it difficult to form a uniform coating. 'i+]' is used for coating cylindrical objects.
Another main purpose is to provide a coating method that is good for preventing excessive penetration of paint into the hollow interior of the object to be coated and for forming a uniform coating.

The coating method according to the present invention has both ends open! After immersing a part of the cylindrical object in the paint, the paint penetrates into a part of the inside of the object.
This method is characterized in that the entire object to be coated is placed in an obstetric room with the Xll space sealed, and then the release condition is stirred from within the paint.

In other words, the coating method for "non-explosion" involves first immersing a part of the cylindrical object 11 in honey to replace part of the air inside the hollow part of the object 11 with the paint. Coating A1'J
By closing the object and applying dip coating, bubbles will not be released from the inside into the paint even if the internal pressure of the object to be coated becomes greater than the external pressure. Figures 1 to 3 show a 4+ embodiment of the coating method according to the present invention.

In Fig. 1, the object to be coated 1 is the base of a photoreceptor used for electrophotographic copying, and is made of circular aluminum (iW)-shaped aluminum with an inner space that is convoluted at both ends (4 open spaces). Reference numeral 2 denotes a holder at the upper end of the object 1 to be coated, and it is connected to the lifting device via a support rod 6 to perform dip coating operations.A valve 4 is opened and closed to prevent the inside of the object 1 from being coated. O-
The ring 5 is used to prevent gas from flowing out from the O-ring by pressing the holder 2 against the circular surface of the object to be coated.

Figure 2 shows that when the object 1 to be coated is immersed in the paint 6 in the coating tank Z with the valve 4 left open, the gas inside the object flows out through the valve 4 and at the same time some of the paint infiltrates. It shows the condition.

FIG. 6 shows a state in which the pulp 4 is closed after a certain amount of the noodle gas has flowed out in FIG. 2, and the object to be coated is immersed in the paint while remaining in the closed state.

Next, from the state shown in Fig. 6, the object to be coated can be coated evenly on the surface of the fabric by using a coating suitable for coating.

4, is 111□1's 1', 'p $na Kiokyo Figure 1 is painted 1] 111t with 100 yen attached to Seno
In the first view, the second figure shows the valve uij radial j♂'-;
Figure 56 is a 1'iU side view of the state in which the tube is closed and immersed. 〇 - Linda 6; Nuri Eid 7; Legend IJ4゛ Sode Mti person Canon Co., Ltd.

Claims (1)

[Claims] (1) After immersing a part of the cylindrical object with both ends open in the paint, the paint penetrates into a part of the inside of the object, and then the internal space of the object is sealed. A coating method characterized by immersing the entire object to be coated in the paint and then removing it from the paint.