JPH0777312A - Burner nozzle for flame treatment - Google Patents

Abstract

PURPOSE:To improve a uniformity performance of a flame temperature in a burner of a device for a flame treatment executing a degreasing and an annealing against a metal strip, by setting a nozzle for a main flame with an arrangement of a zigzag form and a plurality of lines against a flow of the metal strip and making a V shape groove state of a nozzle upper space section. CONSTITUTION:In a burner 1 of a flame treating device executing a degreasing or at the same time an annealing against a metal strip by a flame treatment of a metal strip after rolling, nozzles 3 for a main flame are formed with an arrangement of a zigzag form and a plurality of lines against a flow of the metal strip. Besides, a nozzle upper space section is formed in a V shape or a U shape groove along a direction of a length of the burner 1. A nozzle shape for the main flame is made to have an elongated thin and long shape state along the direction of the length of the burner, and such an arrangement is executed that a set nozzle hole face is so arranged as to have substantially no space within a range having no superposition along a metal strip flow direction. Further, such a regulation of a function is made to execute that a burner combustion heat generating function is within a range of 60000-180000Kcal/hr per 1m of a treatment width of the metal strip.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an annealing / degreasing process for a metal strip after rolling (in the present invention, the metal strip means a metal foil or plate having a thickness of about 5 μm to about 3 mm). In regard to the burner used in the frame treatment of metal strips, the metal strips are highly productive in the width direction and the lengthwise direction of the metal strips and have high uniformity of surface characteristics such as an oxide film, and have high productivity.

[0002]

2. Description of the Related Art Many metals are relatively inexpensive and have excellent mechanical suitability for their price. Therefore, they are inexpensive conductive materials and, in the case of precious metals, have excellent chemical corrosion resistance and decorative properties. Therefore, it is widely used as an industrial material, an electrical material, and a decorative article.

Especially in the fields of packaging materials, electrical materials, daily necessities, ornaments, industrial materials, etc., a large amount of metal foil (about 5 μm to 200 μm) or metal thin plate (about 200 μm to 3 mm) is used for this purpose. Being produced.

These metal strips are generally slab-shaped metal that is rolled using a roll, but the surface after rolling is covered with rolling oil used during rolling, and the metal strips for printing, lamination, etc. Often an obstacle to secondary processing. For this reason, it is usual to anneal the rolled metal strips for degreasing (removal of rolling oil). Usually, it is often done with the metal strip wound in a coil, but it was not without frame treatment.

It is well known that if this degreasing is not performed uniformly over the entire surface of the metal strip, it will cause problems such as a decrease in adhesive strength during printing or laminating and peeling of the printing or laminating.

In this case, when the material of the metal strip is a metal having a relatively high melting point such as iron, this is not a serious problem, but in the case of a metal having a relatively low melting point such as aluminum, copper or alloys thereof, degreasing is performed. In some cases, softening of the material due to annealing and annealing progresses at the same time, and degreasing may cause excessive softening of the metal.

Especially in the frame processing, the number of metal strips is 1.
Since degreasing and annealing are performed by contact with a flame at a temperature of 500 ° C or higher for an extremely short time, the running speed of the metal strip and the heating capacity of the burner are not sufficiently degreased or annealed due to slight errors. It causes troubles such as excess. One of these causes is that the flame temperature of the burner varies in the direction perpendicular to the flow of the metal strip (direction of the burner length).

For this reason, so-called batch annealing, in which annealing is performed while wound in a coil shape, which has problems such as non-uniformity of degreasing in the width direction and long time required, becomes the mainstream, and the surface characteristics in the width direction and the length direction are reduced. Despite some excellent features such as uniformity and high productivity, it seems that this was the reason why annealing degreasing by flame treatment was rarely carried out except for special cases.

However, although various measures have been taken for the unevenness of the metal strip surface characteristics in the width direction and the low productivity due to the batch annealing, this problem is a basic one, and its solution is solved. Is extremely difficult.

Therefore, the present invention has been made to improve the uniformity of the flame temperature of the burner used for the flame treatment, which has the advantages such as the uniformity of the surface characteristics and the high productivity.

[0011]

DISCLOSURE OF THE INVENTION According to the present invention, a condition for contacting a high-temperature frame with a metal strip is that the frame for heating the metal strip has a temperature as uniform as possible over the entire width of the metal strip, and the metal strip has a high temperature. The purpose of this study is to develop a burner that can be used for proper frame treatment for metal strips, which can control degreasing and annealing by making the heating amount per unit area as uniform as possible.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to a burner of a frame processing apparatus for degreasing or simultaneously annealing a metal strip by a frame treatment, wherein main frame nozzles are provided in a plurality of rows for the flow of the metal strip, and Each of the nozzles is arranged in a staggered manner, or a burner for frame treatment of a metal strip, characterized in that the nozzle upper space portion is provided with a V-shaped groove or a U-shaped groove in the length direction of the burner. By developing, the shape of the main frame nozzle is elongated in the length direction of the burner, and the nozzle hole surface provided is substantially in the range that does not overlap with the flow direction of the metal strip. Burner for flame treatment of metal strips arranged in a shape with no gap between them, and burner's combustion heat generation capacity is the treatment width of metal strips 1
60,000 to 180,000 kcal / hr per m
The above object was achieved by developing a burner for frame treatment of a metal strip.

The metal strip to which the present invention is applied is a soft, low-melting metal such as aluminum, copper or an alloy thereof; a noble metal such as gold, silver or platinum; a relatively hard or high metal such as iron or stainless steel. Rolled metal foil (5 to 200 μm or so) of melting point metal, thin metal plate (200 μm)
-3 mm). Particularly, it is preferably used for a metal strip of a soft, low melting point metal or noble metal.

The present invention will be described below with reference to aluminum strips. The aluminum strips may be pure aluminum for general industry (including electrolytic aluminum and ordinary pure aluminum) or aluminum alloy, and in particular, aluminum strip may be used. There is no limit. Although the thickness of the aluminum strip is not particularly limited, it is generally about 5 μm to 3 mm.

The frame treatment is a separator in the rolling process,
Where a single aluminum strip such as a slitter is running (especially when two thin foils are rolled and rolled), or during the process from the separator, slitter, etc. to the aluminum strip winder Can be performed by a frame processing device installed in any of the lines, or a coiled aluminum strip wound through a separator, a slitter, etc. in a process in which an offline frame processing device different from the line is installed. it can. When considering ease of operation and productivity, it is easier to use the inline method at once.

Regarding the apparatus, FIG. 4 shows a schematic view of the frame processing apparatus, and FIGS. 1 to 2 show examples of plan views seen from the nozzle surface of the burner.

Since the cross section of the nozzle of the conventional burner is processed on the curved surface portion of the metal strip, it is necessary to keep the distance from the burner constant, so that the nozzles are arranged in a line as shown in FIG. 3 (4). Is normal. For this reason, a minute space in which fuel is not ejected is generated between the nozzles of the burner, and variations in flame temperature are unavoidable, which greatly affects the degreasing efficiency.
This was a cause of occurrence of striped variations in degreasing at intervals of about mm.

In the present invention, the main frame nozzles for degreasing the metal strip flow are provided in a plurality of rows for the metal strip flow.
This can be solved by using a burner that is provided with rows and staggered nozzle arrangements so that the nozzle holes of multiple rows do not overlap with the flow of the metal strip and there is substantially no gap. It was

Here, the meaning that the nozzle holes do not overlap means that
It means that the metal strip passes at right angles to the nozzle rows of a plurality of rows, but when it passes through the nozzle hole surface in any row, it does not pass through the nozzle hole surface in the other nozzle rows.

Further, in the state where there is substantially no gap, it is ideal to pass through the nozzle hole over the entire surface of the metal strip,
Since the frame expands considerably from the nozzle holes, there may be a gap of about 1.5 mm, preferably about 1.0 mm or less. However, if this gap exceeds 2 mm, stripe-shaped processing variations occur on the processing surface. A circular shape of the nozzle hole is easy for hole processing, but may be an elongated shape (elliptical shape, rectangular shape, etc.) extending in the length direction of the burner. Alternatively, in order to ensure frame continuity, a single row or a plurality of rows of nozzles are provided, and a V-shaped groove [FIG. 3 (2)] or a U-shaped groove [FIG. 3 (3)] may be used as the burner provided with the nozzle.

In this case, the nozzle hole may have an elongated shape and may be obliquely opened with respect to the flow of the metal strip, or a plurality of rows may be provided, but even if a groove is provided in the upper space portion, fuel may diffuse. It is preferable that the nozzle holes do not overlap with the flow of the metal strip. However, in the case of the one-row nozzle, there is an advantage that the gap between the nozzle hole surfaces may be slightly larger than that in the case without the groove.

On the other hand, when the nozzles are provided as slits having the same width in the lengthwise direction of the burner, the frame at the central portion is inevitably strong, and the central portion is likely to be over-processed, and this is adjusted by the slit width. Since it is difficult to do so, it is desired that the length in the longitudinal direction is 5 or less, preferably 3 or less with respect to the width even when the shape is elongated.

The combustion heat generation capacity of the burner varies depending on the type of metal strip, the type and amount of deposited rolling oil, the degree of annealing of the metal strip, the running speed of the metal strip, etc. 60,000 ~ / m
If it is about 180,000 kcal / hr, it can be used for commercial production. If it is intended for strong annealing, or if the metal strip is an iron strip or the like, it may be possible to use it by increasing it by about 50%.

If the calorific value is lower than this range, the productivity is low, and if the calorific value is higher than this range, the burner tends to be over-processed, and it becomes difficult to finely adjust the calorific value.

Considering the ease of manufacturing the burner, the uniformity of the frame temperature, and the uniformity of the treated metal strips, the nozzles are provided in multiple rows for the flow of the metal strips, and the nozzles in each row are arranged in a staggered pattern. Most preferred are burners.

The burner 1 may have only the main frame nozzle 3, but preferably has the pilot frame nozzle 2 in order to maintain the stability of the main frame.

Incorporation of the frame processing device of the present invention is as follows.
For example, when a rolled aluminum strip is separated and the material wound on a roll is subjected to frame processing, there is one as shown in FIG. 4 (for single-sided processing).

Payoff rolled in a roll (11)
Bridle roll (14) with burner (13) installed through aluminum roll from dancer roll (12)
Is supplied to. The bridle roll (14) is driven by a motor (not shown), and the aluminum strip is wound around more than about half of the circumference of the roll with the help of another tension reel or the like. The roll is cooled by circulating cooling water or the like.

The burner (13) is a bridle roll (1
A little away from 4) it is provided so that the frame blows on the aluminum strips (18) on the roll surface. Here, the aluminum strip whose surface has been heated and oil has been incinerated is cooled by the cooling roll in contact therewith, and is also cooled after leaving the frame, so that the annealing of the aluminum strip is prevented. Next, the stripped aluminum strip (1
8) is wound into a roll by a winder (19) after passing through auxiliary rolls such as a rubber roll (15) for preventing wrinkles, a bridle roll (16) and a tension reel (17).

In the above description, a single-sided processing device was shown, but if a bridle roll with adjustable temperature and another set of frame burners are provided so that the other side of the aluminum strip can be framed, the double-sided frame processing is performed. Can be done all at once.

Although the bridle roll (14) has been described as being cooled, it should be a device capable of producing a semi-hard or soft aluminum strip in one pass when it is used as a heating roll such as circulating heating oil or enclosing an electric heater. You can

In the above description, the aluminum strip which has been separated and wound up has been described. However, the frame processing device is combined with a separator or a slitter, or is installed in a line between the separator and the slitter and the winder. Of course, continuous processing may be performed.

The flame treatment of the present invention is carried out by the calorific value of the burner, the thickness of the aluminum strip, the type of rolling oil and the residual oil amount,
Although it depends on the target contact angle of the product aluminum strip with pure water, whether it is in-line or offline, generally high-speed processing of about 100 to 1000 m / min is possible.

Since the burner of the present invention is provided with nozzles having a plurality of nozzle rows or a nozzle having a V-shaped groove or a U-shaped groove in the nozzle upper space portion in the direction of the length of the burner, the width of the heat treatment section may be widened. There is a margin in the control of the operation, and the width of the speed of the metal strip that causes the same effect, for example, degreasing (contact angle with water), can be widened, and there is an advantage that the control is easy.

[0035]

The present invention has excellent surface characteristics in the width direction and the length direction (degreasing and formation of an oxide film) when annealing and degreasing a rolled metal strip, and particularly excellent in the uniformity of the metal strip in the width direction. In order to perform the flame treatment, it was found that the burner was provided with a plurality of main frame nozzles, and the nozzles in each row were arranged in a staggered manner so that the flame treatment temperature could be uniform.

By disposing the nozzle hole surfaces so that they do not overlap with each other in the direction of flow of the metal strip and there is substantially no gap, almost the same maximum flame temperature band that exists without gap over the entire length of the burner is provided only once. It is presumed that the non-uniformity in the width direction has disappeared because it will pass.

Further, in a burner provided with a nozzle having a V-shaped groove or a U-shaped groove in the lengthwise direction of the burner above the nozzle, the fuel ejected from the nozzle diffuses in the upper groove-shaped space before combustion. The temperature range of the flame tends to be relatively uniform even if there is a single row of nozzles, because it burns after that, and a burner equipped with a conventional nozzle [Fig. 3 (4)]
It is considered that the non-uniformity in the width direction can be improved as compared with.

[0038]

[Embodiment] The shape of the nozzle is (1), (2),
The amount of heat generated in the shapes shown in (3) and (4) is 18
50,000, 90,000, 60,000 Kcal / m
A burner of / hr was prepared.

The main frame nozzle 2 of the burner 1 of (1) is 2.8 mmφ (two rows), the pilot frame nozzle is 1.5 mmφ, and both pitches are 2 mm. ), (2), (3), and (4), the main frame nozzle 2 has a 3 mmφ, the pilot frame nozzle has a 2.4 mmφ, and the pitch is 7 mm. Note that the V-shaped upper opening in (2) is a groove having a depth of 4 mm and an upper width of 7 mm, and the opening in (3) is 2 mm in depth and an upper width of 5 mm.
mm groove.

The temperature is measured by measuring the temperatures at both points above the center of the nozzle hole at the same distance from the nozzle surface and above the nozzle and the middle portion of the nozzle. The smaller the temperature difference, the surface of the frame-treated aluminum foil. The temperature distribution state (temperature difference) was measured when the characteristics were uniform. The fuel used was propane and the air ratio was 0.8.
The results are shown in Table 1.

[0041]

[Table 1]

Note: Flame temperature is 1600 to 1650 ° C.
However, the difference due to the nozzle shape cannot be confirmed. Further, in the nozzles of type (2) and (3), the size of the frame becomes large because the fuel gas diffuses in the upper space.

[0043]

In the burner nozzle for frame processing of the present invention, the main frame nozzles are provided in a plurality of rows for the flow of the metal strip, and the nozzles in each row are arranged in a staggered pattern, or the nozzle upper space portion. By providing a nozzle having a V-shaped groove or a U-shaped groove in the length direction of the burner, the temperature of the frame in contact with the metal strip becomes high and the uniformity of the frame temperature can be improved.

As a result, the uniformity of the surface characteristics (degreasing and oxide film) in the width direction of the metal strip obtained by the frame treatment, the uniformity of the annealing were greatly improved, and the high temperature portion of the frame was expanded, which is the reason why the operation was performed. Has the merit of making it easier to control to maintain the conditions.

[Brief description of drawings]

FIG. 1 is a plan view of a nozzle surface of a burner of the present invention.

FIG. 2 is another example of a plan view of the nozzle surface of the burner of the present invention.

FIG. 3 is a cross-sectional shape of a nozzle.

FIG. 4 shows an example of frame processing.

[Explanation of Codes] 1 Burner 2 Pilot Frame Nozzle 3 Main Frame Nozzle 11 Payoff 12 Dancer Roll 13 Burner 14 Bridle Roll 15 Wrinkle Prevention Roll 16 Bridle Roll 17 Tension Roll 18 Metal Strip (Aluminum Strip) 19 Winder 20 Controller 21 Running Speed detector

Claims (3)

[Claims] 1. In a burner of a frame processing apparatus for degreasing or simultaneously annealing a metal strip by a frame treatment, main frame nozzles are provided in a plurality of rows for the flow of the metal strip, and the nozzles are arranged in a staggered pattern. A burner for frame treatment of a metal strip, characterized in that it is provided with a nozzle having a V-shaped groove or a U-shaped groove in the length direction of the burner in the nozzle upper space portion. 2. The main frame nozzle has an elongated shape extending in the direction of the length of the burner, and the nozzle hole surface provided is substantially free from gaps in a range that does not overlap with the flow direction of the metal strip. The burner for treating a frame of a metal strip according to claim 1, wherein the burner is arranged in a shape without a groove. 3. The combustion heat generation capacity of the burner is 60,000 to 180,000 kcal / m per treatment width of the metal strip.
The flame-treating burner for a metal strip according to claim 1 or 2, which is hr.