Three-feeding die head for ultra-wide coating

Abstract

The utility model relates to a three-feeding die head for ultra-wide coating, and belongs to the technical field of coating die heads. The three-feeding die head for ultra-wide coating comprises an upper die head, a lower die head and a gasket, the lower die head is provided with a slurry distribution cavity, the middle of the lower die head is provided with a middle feeding channel and an exhaust channel, the lower die head is further provided with two side feeding channels, and the two side feeding channels are symmetrically located on the two sides of the middle feeding channel. Slurry is introduced into the slurry distribution cavity from the middle feeding channel and the side feeding channels; the exhaust channel is filled with the slurry; and adjusting to a proper coating speed. According to the utility model, the plurality of feeding channels are arranged in the width direction of the coating die head, so that the coating can be uniformly dispersed on the coating, the coating flow of a coating window is approximately uniform, and the thickness of the coating on the width of the ultra-wide coating is approximately consistent.

Description

Technical Field

[0001] The utility model relates to a three-feed die head for ultra-wide coating, belonging to the technical field of coating die heads. Background Art

[0002] Combined with the needs of on-site coating, coating width is consistently sought after by the application end. Increasing coating width can not only effectively save time, but also bring certain benefits to reducing production costs.

[0003] Next, we present a design method for an ultra-wide (ultra-wide is defined as an effective coating width of 1.8 meters to 2.4 meters. Considering the pressure gradient inside the cavity, for an effective coating width die of more than 1.8 meters, the pressure gradient in the middle and on both sides varies greatly.) coating multi-feed die.

[0004] From the fluid analysis results, it can be seen that in the single-feed method, in the adjustment parameter window of coating speed and coating thickness, as the coating thickness and coating speed change, the trend of high in the middle and low on both sides gradually becomes obvious. By adjusting the flow rate and coating thickness, it has basically exceeded the adjustable window. Therefore, in such cases, this patent application proposes to use a multi-feed method to adjust the flow rate at each position, thereby meeting the requirements of ultra-wide coating. Utility Model Content

[0005] In order to solve the above problems, the utility model discloses a three-feed die head for ultra-wide coating, and its specific technical solution is as follows:

[0006] A three-feed die head for ultra-wide width coating, comprising an upper die head, a lower die head and a gasket, wherein the gasket is sandwiched between the upper die head and the lower die head, wherein only one of the upper and lower die heads is provided with a slurry distribution cavity, and the die head provided with the slurry distribution cavity is called the lower die head, wherein a surface of the upper die head and the lower die head in contact with each other is a smooth plane, the slurry distribution cavity is attached to the smooth plane of the upper die head, and a gap between the lip of the lower die head and the lip of the upper die head that passes through the slurry distribution cavity is a slurry flow-blocking channel, wherein a middle feed channel and an exhaust channel connected to the slurry distribution cavity are provided in the middle of the lower die head, and the lower die head is further provided with two side feed channels, and the two side feed channels are symmetrically located on both sides of the middle feed channel;

[0007] The specifications of the gasket are consistent with the contact surfaces of the upper die head and the lower die head, and surround the slurry flow-blocking channel and the outer periphery of the slurry distribution cavity.

[0008] Furthermore, the lip of the upper die head and the lip of the lower die head are vertically downward, and the slurry flow-blocking channel is vertically downward.

[0009] Furthermore, the slurry distribution chamber gradually becomes larger from the two ends to the middle of the chamber, and the exhaust passage is connected to the highest point in the middle of the slurry distribution chamber.

[0010] Furthermore, the top surface of the slurry distribution cavity is inclined in a straight line from both ends to the middle, with an inclination angle of 1 to 3 degrees, and the side surface of the slurry distribution cavity remains unchanged.

[0011] Furthermore, the two side feed channels are located at 25%±5% and 75%±5% of the length direction of the slurry distribution chamber.

[0012] Furthermore, the exhaust channel is arranged obliquely to the surface where the slurry flow-blocking flow channel is located, and the exhaust channel is arranged obliquely upward, and the angle between the exhaust channel and the vertical plane is 20 to 45 degrees.

[0013] Furthermore, the middle feed channel and the side feed channel are both perpendicular to the surface where the slurry flow-blocking flow channel is located, and the slurry is fed into the slurry distribution cavity perpendicularly.

[0014] Furthermore, the distance between the points where the middle feed channel and the side feed channels communicate with the slurry distribution chamber and the upper / lower edge of the slurry distribution chamber is 40% to 60%.

[0015] Furthermore, the distance between the lip and the slurry distribution cavity is 25-30 mm, that is, the length of the slurry flow-blocking channel is 25-30 mm, and the thickness of the slurry flow-blocking channel is the thickness of the gasket.

[0016] Furthermore, a stop valve is provided on the exhaust passage.

[0017] The beneficial effects of the utility model are:

[0018] The utility model provides a plurality of feed channels in the width direction of the coating die head by arranging one middle feed channel and two side feed channels, so that the coating can be evenly dispersed on the coating, so that the coating flow of the coating window (the coating window is the width of the slurry flow-blocking channel) is uniform (close to uniform), and the coating thickness is consistent (close to consistent) over the width of the ultra-wide coating.

[0019] The utility model application has subversive value for the progress of peers, has application value in making ultra-wide coatings, and has great market value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 This is a schematic diagram of the lower die head structure of the utility model.

[0022] Figure 3 This is a schematic diagram of the connection of the slurry distribution chamber of the utility model.

[0023] List of reference numerals: 1—upper die head, 2—lower die head, 3—gasket, 4—slurry distribution chamber, 5—slurry flow-blocking channel, 6—middle feed channel, 7—side feed channel, 8—exhaust channel.

[0024] Figure 4 It is a simulation diagram of the streamlines of Examples 1 to 5 of the present utility model;

[0025] Figure 4 Middle: 1 inlet is the middle inlet, 2 inlet is the left and right side inlet, 3 inlet is the left, middle and right inlet at the same time; 1 outlet is the bottom outlet (lip outlet), 2 outlets are open for exhaust at the same time. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementations. It should be understood that the following specific implementations are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0027] Combined with Figure 1-2 It can be seen that the three-feed die used for ultra-wide width coating includes an upper die, a lower die and a gasket, and only the lower die has a slurry distribution cavity. The upper die does not have a slurry distribution cavity. The gasket is sandwiched between the upper die and the lower die, and a slurry distribution cavity is provided on the side of the lower die facing the upper die. The gap between the lip of the lower die and the lip of the upper die that passes through the slurry distribution cavity is the slurry flow-blocking channel. The gasket is placed on the contact surface between the upper die and the lower die, and is surrounded by the slurry distribution cavity and the outside of the slurry flow-blocking channel. The thickness of the gasket is the thickness of the slurry flow in the slurry flow-blocking channel. The distance from the lip to the slurry distribution cavity is 25 to 30 mm, that is, the length of the slurry flow-blocking channel is 25 to 30 mm, and the thickness of the slurry flow-blocking channel is the thickness of the gasket.

[0028] The middle part of the lower die head is provided with an intermediate feed channel and an exhaust channel connected to the slurry distribution chamber, and a stop valve is provided on the exhaust channel. The lower die head is also provided with two side feed channels, and the two side feed channels are symmetrically located on both sides of the intermediate feed channel. The two side feed channels are located at 25%±5% and 75%±5% of the length direction of the slurry distribution chamber. The intermediate feed channel and the side feed channels are perpendicular to the surface where the slurry flow-blocking flow channel is located, and the slurry is fed into the slurry distribution chamber vertically. By setting up three feed channels, the slurry can achieve better uniformity in the wide direction of coating. The point where the intermediate feed channel and the side feed channel are connected to the slurry distribution chamber is 40% to 60% away from the upper / lower edge of the slurry distribution chamber.

[0029] The lip of the upper die head and the lip of the lower die head are vertically downward, and the slurry flow-blocking channel is vertically downward.

[0030] The slurry distribution chamber gradually becomes larger from the two ends to the middle. The top surface of the slurry distribution chamber is inclined straightly from the two ends to the middle, and the inclination angle is 1 to 3 degrees. The side of the slurry distribution chamber remains unchanged. 1 to 3 degrees is to utilize the buoyancy generated by the different densities of air and liquid to smoothly discharge the gas. The exhaust channel is connected to the highest point in the middle of the slurry distribution chamber. The exhaust channel is inclined to the surface where the slurry flow-blocking flow channel is located, and the exhaust channel is inclined upward, and the angle with the vertical plane is 20 to 45 degrees.

[0031] The coating method based on the above three-feed die head for ultra-wide coating comprises the following steps:

[0032] Step 1: Arrange the foil to be coated with the slurry vertically below the lip, and adjust the distance and angle between the lip and the foil to be coated;

[0033] Step 2: introducing slurry from the middle feed channel and the side feed channel into the slurry distribution trough;

[0034] Step 3: Open the stop valve on the exhaust channel until the exhaust channel is filled with slurry, and then close the stop valve;

[0035] Step 4: Start the pulling speed of the coated foil and adjust it to the coating speed;

[0036] Step 5: adjusting the feed flow rate of the middle feed channel so that the feed flow rate of the middle feed channel is greater than the feed flow rate of the side feed channel;

[0037] Step 6: Test the lateral uniformity of the coating, and repeat step 5 until the lateral uniformity of the coating meets the requirements, and determine the feed flow rates of the middle feed channel and the side feed channel;

[0038] Step 7: Maintain the feed flow rate of the middle feed channel and the side feed channel to continue production.

[0039] In order to verify the coating effect of this patent, the following coating simulations are performed on 1 feed channel, 2 feed channels, 3 feed channels, and a die head with an exhaust channel. The simulation results are shown in the figure. Figure 4 shown.

[0040] The coating process of the simulation experiment is shown in Table 1:

[0041] Table 1 Coating process requirements

[0042]

[0043] The parameters used in the coating process are shown in Table 2 below:

[0044] Table 2

[0045] project 1200 blades Dry thickness μm 0.7 Solid 15.5％ Wet thickness μm 4.52 Coating speed m / min 0.6 Flow rate mL / s 0.0542 Viscosity mPa·s 100 Gasket thickness μm 50 Leveling zone flow length mm 25 Tool distance GAP value μm 100

[0046] The feed amount of each simulation experiment is shown in Table 3 below:

[0047] Table 3

[0048] Feed volume (mL / s)

[0049] Combined with Figure 4 It can be seen that the two-outlet scheme is very likely to generate vortices in the center of the cavity, and the two-outlet scheme will increase the slurry flow at the inlet and exhaust ports. Therefore, the two-outlet scheme is beneficial to reducing the slurry residence time.

[0050] Combined with Table 4 below, the data of each simulation experiment are summarized.

[0051] Table 4

[0052]

[0053] Note:

[0054] 1. The inlet pressure represents the slurry flow resistance that needs to be overcome to meet the coating thickness. The greater the pressure, the greater the resistance;

[0055] 2. Horizontal consistency = (maximum value - middle value) ÷ middle value × 100%, middle value = (maximum value + minimum value) ÷ 2.

[0056] Through experimental simulation, we know that:

[0057] 1. Under the simulation conditions of this experiment, the above feeding methods can obtain better coating consistency.

[0058] 2. Due to the influence of exhaust port backflow, the 2-in-2-out or 3-in-2-out scheme is very likely to produce a slightly lower intermediate flow rate, and it is necessary to combine it with more intermediate feeding.

[0059] 3. There are certain differences in the consistency of single-feed and multi-feed simulations, but they are both less than the die processing accuracy and on-site installation accuracy and can be ignored.

[0060] To sum up, more in and more out is feasible.

[0061] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0062] The meaning of "and / or" described in this application means that the situations where each exists alone or both exist at the same time are included.

[0063] The term “connection” as used in this application may mean a direct connection between components or an indirect connection between components via other components.

[0064] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A three-feed die for ultra-wide coating, comprising an upper die, a lower die and a gasket, wherein the gasket is sandwiched between the upper die and the lower die, characterized in that: Only one of the upper and lower die heads is provided with a slurry distribution cavity, and the die head provided with the slurry distribution cavity is called the lower die head. The surface of the upper die head that is bonded to the lower die head is a smooth plane, and the slurry distribution cavity is attached to the smooth plane of the upper die head. The gap between the lip of the lower die head and the lip of the upper die head that passes through the slurry distribution cavity is a slurry flow-blocking channel. The middle part of the lower die head is provided with an intermediate feed channel and an exhaust channel that are connected to the slurry distribution cavity. The lower die head is also provided with two side feed channels, and the two side feed channels are symmetrically located on both sides of the intermediate feed channel. The specifications of the gasket are consistent with the contact surfaces of the upper die head and the lower die head, and surround the slurry flow-blocking channel and the outer periphery of the slurry distribution cavity.

2. The three-feed die head for ultra-wide coating according to claim 1, characterized in that: The lip of the upper die head and the lip of the lower die head are vertically downward, and the slurry flow-blocking channel is vertically downward.

3. The three-feed die head for ultra-wide coating according to claim 1, characterized in that: The slurry distribution chamber gradually becomes larger from the two ends to the middle, and the exhaust channel is connected to the highest point in the middle of the slurry distribution chamber.

4. The three-feed die for ultra-wide coating according to claim 3, characterized in that: The top surface of the slurry distribution cavity is inclined in a straight line from both ends to the middle, with an inclination angle of 1 to 3 degrees, and the side surface of the slurry distribution cavity remains unchanged.

5. The three-feed die head for ultra-wide coating according to claim 1, characterized in that: The two side feed channels are located at 25%±5% and 75%±5% of the length direction of the slurry distribution chamber.

6. The three-feed die for ultra-wide coating according to claim 1, characterized in that: The exhaust channel is arranged obliquely to the surface where the slurry flow-blocking flow channel is located, and the exhaust channel is arranged obliquely upward, and the angle between the exhaust channel and the vertical plane is 20 to 45 degrees.

7. The three-feed die for ultra-wide coating according to claim 1, characterized in that: The middle feed channel and the side feed channel are both perpendicular to the surface where the slurry flow-blocking flow channel is located, and the slurry is fed into the slurry distribution cavity perpendicularly.

8. The three-feed die for ultra-wide coating according to claim 1, characterized in that: The ratio of the point where the middle feed channel and the side feed channel are connected to the slurry distribution chamber to the upper / lower edge of the slurry distribution chamber is 40% to 60%.

9. The three-feed die for ultra-wide coating according to claim 1, characterized in that: The distance between the lip and the slurry distribution cavity is 25-30 mm, that is, the length of the slurry flow-blocking channel is 25-30 mm, and the thickness of the slurry flow-blocking channel is the thickness of the gasket.

10. The three-feed die for ultra-wide coating according to claim 1, characterized in that: A stop valve is arranged on the exhaust passage.

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