RU1808411C - Device for applying poly-p-xylylene coating - Google Patents

Abstract

Usage: applying poly-p-xylene oxide coatings to products in the radio engineering, electronic and other industries. SUMMARY OF THE INVENTION: the device comprises a sublimation chamber with a container for coating material, a pyrolysis chamber, a pre-cooling tank and a coating chamber with a central nozzle. It is connected to a vacuum pipe. The pre-cooling tank is made in the form of a ring with a screw-shaped bottom. It is tangentially connected to the pyrolysis chamber and is separated from the coating chamber by a removable partition with holes. The size of the holes increases with distance from the pyrolysis chamber. Cooler plates are arranged radially on a central pipe inside the coating chamber. They are configured to adjust the temperature along their length. The coated parts of the mouth are poured onto the cooling plates with a gap. 2 ill.

Description

The invention is intended to apply a moisture barrier layer to electronic equipment, microassembly blocks and can be used in the radio engineering, electronics and other industries.

The aim of the invention is to improve the quality of the coating by ensuring uniform application over the entire surface of the product.

On Fig, 1 shows a longitudinal section of a device; figure 2 is a section aa in figure 1.

The device for applying poly-p-xylylene coatings is a sealed container 1 connected to a vacuum manifold 2. The tank 1 consists of a sublimation chamber 3, a pyrolysis chamber 4, a pre-cooling tank 5 located at the inlet of the coating chamber 6. The chambers 3,4 and 6 are cylindrical, and the pre-cooling tank 5 is made in the form of a ring 7 with a screw-like raising of the bottom 8 and tangentially connected via a pipe 9 to the pyrolysis chamber 4. The sublimation chamber 3 is provided with heaters 10, a cover 11 and a container 12 with coating material and is connected to the pyrolysis chamber 4, which is equipped with heaters 13.14, a removable screw 15 made of heat heat conductive material. Between Pre-Cooling Tank 5 and Chamber

00

about

00

the cover 6 is a removable partition 16, made with holes 17,18,19, 20, 21, 22, located on a circle, the size of which increases with distance from the pyrolysis chamber 4, the Pre-cooling chamber 5 and the cover 6 are equipped with heaters 23 and 24 and a central pipe 25 connected to a vacuum pipe,

Inside the coating chamber b, holders in the form of cooler plates 26 are provided radially placed on the central pipe 25 and equipped with temperature adjustment means along their length, while on the cooler plates 26 with a clearance of 27, covered articles 29 are installed with grippers 28.

The device operates as follows. zom.

Before starting work, the lid 11 is removed from the device and the required dose of the coating material 30 (cyclod-p-xylylene) is poured into the container 12, after which the lid 11 is closed.

The coating chamber 6 is removed from the device and the coated articles 29 are mounted on the cooler plates 26 with a clearance 27 by means of grippers 28, after which the coating chamber b is installed in its original place. Then, air is evacuated from the container 1 through the central pipe 25 and the vacuum pipe 2 to create the necessary air. At the same time, cooler plates 26, made with the possibility of adjusting the temperature along their length, cool the products 29 installed on them with a gap 27 by means of grippers 28. Moreover, the cooling of the products 29 is uneven - the upper, most distant from the pre-cooling chamber 5 is cooled more strongly. part of the parts in order to obtain a more uniform coating on the entire surface of the parts.

After reaching the necessary vacuum in the tank 1 and cooling the products 29, the heaters 10, 14, 23 and 24 are turned on and a coating process is carried out for a set time, during which the cyclo-p-xylylene vapor from the sublimation chamber 2 (enters the pyrolysis chamber 4 where the formation of p-xylylene occurs.

In this case, when the vapors of the cyclod-p-xylylene pass through the heated screw 15 made of heat-resistant heat-conducting material, a more complete formation of p-xylylene is ensured.

Further, in the pre-cooling tank 5, made in the form of a ring 7 with a screw-shaped rise of the bottom 8, the vapors are gradually cooled through the holes

17, 18, 19. 20, 21, 22, located in a circle in the removable partition 16, uniformly enter the coating chamber 6, then, the passage along the products 29, are deposited on

their surfaces in an even layer, where the polymerization of the coating takes place.

Immediately after the start of the polymerization of the coating, the means for adjusting the plate-coolers are turned off in order to save

coating material.

After the end of the cycle, all heaters are turned off and after cooling all the chambers 3, 4, 5, 6, air is supplied to the tank 1.

Then the camera is removed from the device

5 of the coating 6 and the coated products 29 are removed from the cooler plates 26, and in their place a new batch of products 29 is installed and the coating chamber 6 is installed in the same place, In the container 12 as before

0, a new portion of coating material 30 is poured, After which the cycle is repeated.

In the proposed device, the pre-cooling tank is made with a screw-shaped raising of the bottom 8, and the openings 5 in the partition 16 are arranged in a circle and their size increases with distance from the pyrolysis chamber 4, as a result of which the vapor stream in the pre-cooling tank 5 is gradually cooled

0 partitions 16, evenly enters the coating chamber 6.

In addition, the proposed device provides the ability to adjust the temperature when cooling products 29

5 by cooling plates 26 so that parts of the products further from the vapor source are cooled more so that the same coating layer forms there as on parts closer to

0 source of vapor.

Vapor is sucked out from the top of the coating chamber 6 so as to reduce the possibility of forming so-called dead zones.

5 The proposed device provides uniform coverage over the entire surface of the coated products 29, reduces the percentage of marriage of the product by improving the quality of the coating and, in addition, reduces

0 consumption of coating material by reducing cooling on the walls of the chamber and cooling plates 26.

Claims (1)

SUMMARY OF THE INVENTION A device for applying poly-p-xi5 polyethylene coatings comprising a sequentially placed sublimation chamber with a container for coating material, a pyrolysis chamber and a coating chamber with article holders and with a central pipe connected to a vacuum wire, characterized in that in order to improve the quality of the coating by ensuring uniform application over the entire surface of the product, the inlet of the coating chamber is made in the form of an annular pre-cooling tank with a screw-shaped lift m bottom tangentially connected to the pyrolysis chamber and separated from the coating chamber by a removable partition with a size Holes around the circumference, the size of which is selected to increase with distance from the pyrolysis chamber, the holders are made in the form of cooler plates with temperature adjusting means along their length and placed radially on the central branch pipe of the coating chamber for installing products with a gap .