JPS583974A - Device for preventing evaporation deposit from sticking to back side of tape-form article - 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 device for protecting the back side of a moving strip-shaped basic object, in particular a metal basic object, during vacuum deposition, in particular during the vacuum deposition of zinc at high coating rates. Generally, steel strips are processed by vapor deposition on both sides to prevent surface corrosion. In special cases (for example in the case of car body steel) it is necessary to carry out the vapor deposition on only one side and to ensure that the back side is a clean, free surface.

The following method is known for depositing only on one surface of a strip of material. Thus, vacuum deposition on plastic foils is generally carried out by guiding the foils over cooled rollers. This arrangement, which removes condensation and radiant heat during vacuum deposition, simultaneously prevents backside deposition.

It is also known to use a mask which is placed so as to stop or move near the surface of the basic object on which the deposition is to be prevented, or generally on which the structural deposition is to be made.

Furthermore, it is known that the condensation of metal vapors onto areas on a moving elementary object (for example a plastic foil) can be prevented in the following manner. That is, a reverse flow of the substance deposited onto the basic body is induced, which is generally achieved by preevaporating the oil.

The known methods as described above cannot be used to deposit only on one surface of the steel strip and cannot be modified for trenches. When performing vacuum deposition on steel strips, the coating speed is approximately 2 to 4 times faster than the coating speed by the method applying the above-mentioned principle. A relatively dense vapor cloud with a pressure of several times 103 Pa is formed between the deposited moon phase and the coated steel strip. A strong interaction of the material particles occurs on the way from the deposited material to the steel strip, so that the deposited material particles both in this range and on the other side of the steel strip
Possessing velocity components in all directions leads to back side deposition. The surface of the roller, which protects the back side of the steel strip during the deposition process, develops a thick deposition layer after a few minutes, thus making it necessary to stop the deposition cycle.

For the same reason, the belts that circulate in the industrial production process, which have a similar function, do not have enough working time.

The aim of the invention is to create a device that reliably prevents deposition material from adhering to the back side of the basic object and has a long working time. The equipment should be relatively inexpensive and maintenance free. That is, the present invention creates an apparatus for preventing deposition substances from adhering to the back surface of a moving strip-shaped basic object, particularly a strip-shaped steel, when the deposition is carried out at a variable deposition rate on the surface. can be used regardless of the width of the strip and can accommodate errors in the width of the strip, lateral displacements of the edge position as well as vibrations of the strip.

The above objects are achieved by the present invention as follows. This is achieved by arranging a sliding plate perpendicularly and parallel to both edges of the base body in the region of the vapor deposition apparatus container, which sliding plate is supported over its entire length on a prismatic surface. This supporting device is displaceable in the plane of the basic object, so that it can be adapted to different widths of the basic object. At the same time as the support device is moved, the support device uses a gas-tight plate disposed on the device to prevent the vapor of the evaporated material from entering the space above the vapor deposition device. The support device or the sliding plate is designed such that in the static equilibrium position it lies perpendicular to the strip, so that the sliding plate contacts the strip without exerting any significant horizontal forces. The sliding plate can therefore be easily avoided when the edge of the strip vibrates or if the edge is not flat. In order to be able to exceed the equilibrium position and follow the edge of the strip, an additional horizontal force must press the sliding plate against the edge of the strip.

For the force necessary for this purpose, the force inherent in the vapor deposition system, that is, the vapor pressure of the evaporated substance is utilized. Regardless of the position of the sliding plate, the steam pressure exerts a fairly constant force on the edge of the strip.

It is advantageous for the sliding plate to be made of a heat-stable hard material, in particular a hard metal.

Furthermore, it is expedient to heat the components of the device according to the invention, namely the sliding plate and its supporting device.

For this purpose, it is advantageous to use the heat of the steam to heat the sliding plate and adjacent parts to a temperature of 400 DEG C. The surface of the sliding plate is cooled in the area in contact with the base body, so that vapor condensation occurs in this area. This condensate layer, which does not exceed a certain thickness due to reevaporation, has proven to be an excellent lubricant in the deposition of zinc on steel strips.

The mechanism of the reservoir, which is steplessly adaptable to various base bodies, is capable of pivoting away from the plane of the base body so that the evaporator can be replaced with the base body loaded. It is for a purpose that it is formed.

In the support device for the sliding plate, the fixed support is formed as a blade and a prism is arranged on the sliding plate. However, it is also possible for the fixed support to be designed as a prism and for the sliding plate to have an element designed as a blade. The finished sliding plate must be formed with various strengths so that the force pushing against the edge of the strip does not damage or bend the edge. In doing so, the influence of the steam pressure around the base body and the thickness of the base body must be considered together.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the accompanying drawing, a device according to the invention for vapor deposition on steel strips is shown in cross section, with the sliding plate being supported on one side by a prism and on the other side by a blade.

The sliding plate 1 is connected to the prism 2 over its entire length in a reliable and airtight manner (for example, by inserting a graphite foil).

The prism rests over its entire length on the blade 3 and the nuclear force is coupled to the lever 4. By pivoting the lever 4 using a known vacuum bell penetration device located above, the blade 3
and thereby the sliding plate 1 can be adapted to the width of the steel strip 5. A planar gas-tight plate 6 is flexibly connected to the blade 3, so that it always lies tightly against the edge of the evaporator container 7 when adapted to the width of the strip-shaped object. In this case, the force generated by the weight of the airtight plate 6 must always be equal to the opposing force υ generated from the vapor pressure inside the evaporation space 8 and the area of the airtight plate 6. The blade 3 has an abutment part 9 which prevents the sliding plate from falling if the edge of the strip is broken so that it has a sharp edge.

The sliding plate 1 on the left side of the figure has an arm 10 formed in the shape of a blade 3.
The arm is supported within the prism 11. The prism 11 is connected to an airtight plate 12, which is curved to correspond to the distance between the rotation centers of the lever 4, and is guaranteed to be in close contact with the edge of the evaporator container 7 at all times. The airtight plate 12 can be made thinner than the airtight plate 6 and can be fitted with known reinforcing materials on its upper surface to prevent it from deforming under the influence of heat.

For evaporating zinc and similar metals with high vapor pressure, a closed evaporator vessel 7 with a vapor outlet located directly in front of the steel strip 5 is used. In this vessel, steam at a relatively high pressure (up to several times 103 P^) is generated from an evaporator located within a geometrically limited area. If condensation does not occur in the space behind the sliding plate 1, that is, if the sliding plate member is heated and the dew point of the steam has not been reached, the above-mentioned high steam pressure will also be formed behind the sliding plate 1. 3,
By suitably selecting the geometry of the support of the slide plate and the arrangement of the surfaces of the steel strip 5, it is possible to ensure that the force obtained by the steam pressure presses the slide plate 1 with a light and constant force against the edge of the steel strip. It becomes sufficient.

[Brief explanation of the drawing]

10 - An example in which the sliding plate of the other (tttl) was able to reach the blade is shown. ,3・
・・Blade, 4 ・・Lever'+ 6.12・・
- Airtight plate, 7... Evaporator container, 8... Evaporation space, 11... Square column. 11-Continued from page 1 ■Inventor Volkmar Spreitz, Dresden, Zwinglisstrasse 47 0 Inventor Horst Schmidt, Dresden, Rommatsuz Schell-Strasse, German Democratic Republic 44 389-

Claims (1)

[Claims] 1) In a device for preventing vapor deposition substances from adhering to the back side of a strip-shaped basic object, sliding plates are provided parallel to both edges of the basic object in the area of the evaporator container (7). (1
) is arranged vertically, the sliding plate is supported over its entire length on the plane of a prism, the sliding plate is in pressure-free contact with the edge of the base object, the sliding plate (1) Gas-tight plates (6, 12) are arranged on the support device, which rest on the edges of the evaporator container (7) and close off the evaporation space (8) on both sides of the basic body. that the sliding plate (1), together with the supporting device and the airtight plate (6, 12), can be displaced according to the width of the foundation object; and that the sliding plate (]) and its supporting device 1- A device characterized in that the slide plate (1) is formed to press the sliding plate (1) against the edge of the base object. 2. The device according to claim 1, in which the sliding plate (1) is connected to a prism (2), which prism is connected to the blade (3).
) is supported by a device line. 3) In the device according to claim 1, the sliding plate (1) is connected to the blade (3), and the nuclear force is applied to the prism (1).
1) A device characterized by being supported by. 4) In the device according to any one of claims 1 to 3, the sliding plate (1) is made of a heat-stable hard material, in particular a hard alloy. 3.5) A device according to any one of the dimensions of claims 1 to 4, characterized in that the sliding plate (1) and its supporting device are characterized in that A device characterized in that it is heated to about 40°C. 6) In the device according to claim 1, the sliding plate ( ) and its supporting device are displaced according to the width of the basic object using a lever (4) arranged on the device. A device characterized in that it is enabled and still capable of turning away from the range of the steam device.