Slit purging type coating die head

Abstract

The utility model relates to a slit purging type coating die head which comprises an upper die, a lower die and a vertical die, a slurry runner is arranged between the upper die and the lower die, and a purging runner is arranged between the upper die and the vertical die. The slurry runner comprises a slurry inlet channel, a slurry distribution cavity and a slurry slit flow blocking runner, the slurry distribution cavity is formed in the lower die, and the slurry inlet channel is formed in the side face of the lower die and communicates with the slurry distribution cavity. The purging runner comprises a purging inlet, a purging distribution cavity and a purging slit flow blocking runner, the purging distribution cavity is formed in the vertical mold, and the purging inlet is formed in the side face of the vertical mold and communicates with the purging distribution cavity. Cleaning liquid can be blown into the purging runner to clean the lip of the die head in a non-contact mode, and manual cleaning is not needed when the die head is shut down. And inert gas or air can also be blown into the purging runner, and the slurry generated by the coanda effect can be inhibited from climbing upwards by using gas dynamic pressure during intermittent coating, so that the phenomenon that a large amount of slurry is accumulated at the lip of the upper die to cause tail material dragging is avoided, and the coating quality is improved.

Description

Technical Field

[0001] The utility model relates to a slit purging type coating die head, belonging to the technical field of coating die heads. Background Technique

[0002] The coating process is one of the key processes in the production of products such as optical films, plastic films, lithium battery electrodes, and hydrogen fuel cells. Lip edge agglomeration is likely to occur during the coating process. The existing treatment method is to stop the machine for cleaning and wiping, and accidents such as damaging the lip edge or cutting the operator are likely to occur during wiping.

[0003] For the coating production process of lithium battery electrodes or hydrogen fuel cells, when the particulate active substances contained in the slurry system are not easily formed into a stable system with the solvent, the separation of solute and solvent is extremely likely to occur at the lip edge, and due to the Coanda effect, the slurry accumulates at the lip edge. During intermittent coating, the accumulated slurry is likely to cause a trailing phenomenon due to gravity at the end of the interval, and it will affect the head of the next interval, deteriorating the head and tail quality during intermittent coating. The head and tail quality of intermittent coating is crucial for the production of lithium battery electrodes. If the head and tail quality does not meet the standards, it will cause the electrode to wrinkle or even rupture.

[0004] The invention patent application with the patent application number 202111022231.9 discloses a coating die head, including a die head body and an adjusting mechanism. A fluid distribution cavity is provided in the die head body. A coating lip edge, a discharge channel, and an adjusting mechanism are provided on the die head body. The adjusting mechanism is adapted to switch the fluid distribution cavity to communicate with the coating lip edge or the fluid distribution cavity to communicate with the discharge channel. When coating and discharging, the adjusting mechanism is started, and the adjusting mechanism cuts off the communication between the fluid distribution cavity and the discharge channel, so that the fluid distribution cavity communicates with the coating lip edge, and the slurry flows out from the coating lip edge and is coated on the substrate. When coating and leaving a blank, the adjusting mechanism is started again. At this time, the adjusting mechanism cuts off the communication between the fluid distribution cavity and the coating lip edge, so that the fluid distribution cavity communicates with the discharge channel, and the slurry is discharged out of the die head through the discharge channel. By adopting the above adjusting mechanism, the intermittent valve in the prior art is replaced, thus solving the trailing phenomenon caused by the pressure buildup due to insufficient evacuation inside the die head cavity.

[0005] The above-mentioned prior art still has the following deficiencies in actual use:

[0006] (1) The above-mentioned invention patent application does not fully consider the non-contact cleaning at the lip edge, and it is easy to wear the lip edge during cleaning, reducing the service life of the die head.

[0007] (2) The above-mentioned invention patent application does not fully consider the coating scenarios where the solute and solvent in the slurry are extremely easy to separate (such as fuel cell slurry coating). The separation of the slurry at the lip and the Coanda effect are likely to cause slurry accumulation. During long-term operation, slurry accumulation will occur, seriously affecting the quality of intermittent coating. Most of the existing technical solutions are passive responses. For example, changing the mutual solubility of the slurry dispersion system is often difficult to achieve.

[0008] It can be seen that the problem of slurry accumulation at the lip has not been effectively solved in the industry. Utility Model Content

[0009] In order to solve the above problems, the present utility model discloses a slit purging type coating die head, and its specific technical solution is as follows:

[0010] A slit purging type coating die head includes an upper die (100), a lower die (200) and a main gasket (400). The main gasket (400) is in a "concave" shape and is clamped between the upper die (100) and the lower die (200). The lower die (200) is provided with a slurry distribution cavity (202) and a slurry inlet channel (201). The slurry inlet channel (201) extends from the slurry distribution cavity (202) to the outside of the lower die (200). The main gasket (400) surrounds the rear side and the left and right sides of the slurry distribution cavity (202). The gap between the front side of the slurry distribution cavity (202) and the lips of the upper die (100) and the lower die (200) forms a slurry slit choke flow channel (203). The slurry inlet channel (201), the slurry distribution cavity (202) and the slurry slit choke flow channel (203) are collectively referred to as the slurry flow channel;

[0011] A vertical die (300) is arranged on the front side of the upper die (100). The vertical die (300) is closely attached and fixed to the front side of the upper die (100). A purging distribution cavity (302) is formed on the side of the vertical die (300) facing the upper die (100). The vertical die (300) is also provided with a purging inlet (301). One end of the purging inlet (301) is communicated with the purging distribution cavity (302), and the other end extends to the surface of the vertical die (300);

[0012] A vertical die gasket (500) is also laid on the contact surface between the upper die (100) and the vertical die (300). The vertical die gasket (500) is also in a "concave" shape and surrounds the left and right sides of the purging distribution cavity (302) and the side of the purging distribution cavity (302) away from the lip. The gap between the purging distribution cavity (302) and the lips of the upper die (100) and the lower die (200) forms a purging slit choke flow channel (303). The purging inlet (301), the purging distribution cavity (302) and the purging slit choke flow channel (303) are called the purging flow channel.

[0013] Further, one end of the vertical die (300) close to the lip is provided with an inclined surface having the same inclination angle as the upper surface of the lip, and the gap between the inclined surface and the lip is an air flow channel.

[0014] Further, more than one purging inlet (301) and / or slurry inlet channel (201) is provided.

[0015] Further, the purging inlet (301) is located at the opposite end of the vertical die (300) close to the lip.

[0016] Further, the purging inlet (301) is located on the opposite side of the contact surface between the vertical die (300) and the upper die (100).

[0017] Further, the cross-sectional shape of the cavity of the slurry distribution chamber (202) and / or the purging distribution chamber (302) is trapezoidal, semi-circular, elliptical or semi-droplet-shaped.

[0018] Further, the vertical die (300) is fixedly connected to the upper die (100) and the vertical die gasket (500) by screwing bolts into a plurality of vertical die fixing holes (304) opened on its left, right and upper sides.

[0019] Further, the upper die (100) is provided with a plurality of upper die fixing holes (104), and bolts are screwed into the upper die fixing holes (104) and the lower die (200) to fixedly connect the upper die (100), the main gasket (400) and the lower die (200).

[0020] The beneficial effects of the present utility model are as follows:

[0021] The purging flow channel of the present utility model can blow in cleaning liquid to achieve non-contact cleaning of the die lip. During shutdown, manual cleaning is not required, which avoids abrasion of the lip during manual wiping, thereby prolonging the service life of the die; it also avoids accidents of the die lip cutting people.

[0022] The purging flow channel of the present utility model can also blow in inert gas or air. During intermittent coating, gas dynamic pressure can be used to suppress the upward climbing of the slurry caused by the Coanda effect, thereby avoiding a large amount of accumulation of the slurry at the upper die lip and resulting in tail dragging, and improving the coating quality. Description of the Drawings

[0023] Figure 1 is a three-dimensional structural schematic diagram of the whole of the present utility model,

[0024] Figure 2 is a structural schematic diagram of the slurry flow channel and the purging flow channel in the present utility model,

[0025] Figure 3This is a schematic diagram of the purging function of the purging flow channel in the present utility model.

[0026] List of reference numerals: 100 - upper die; 104 - upper die fixing hole positions; 200 - lower die; 201 - slurry inlet channel; 202 - slurry distribution cavity; 203 - slurry slit blocking flow channel; 300 - vertical die; 301 - purging inlet; 302 - purging distribution cavity; 303 - purging slit blocking flow channel; 304 - vertical die fixing hole positions; 400 - main gasket; 500 - vertical die gasket; 600 - lip. Detailed implementation manners

[0027] The present utility model will be further clarified below in conjunction with the accompanying drawings and specific implementation manners. It should be understood that the following specific implementation manners are only used to illustrate the present utility model and not to limit the scope of the present utility model.

[0028] Embodiment 1

[0029] Combined with the attached Figures 1-3 It can be seen that the present utility model includes an upper die 100, a lower die 200, a vertical die 300, a main gasket 400 sandwiched between the upper die 100 and the lower die 200, and a vertical die gasket 500 sandwiched between the upper die 100 and the vertical die 300. Between the upper die 100 and the lower die 200, a slurry slit blocking flow channel 203 is formed due to the padding of the main gasket 400, and the slurry slit blocking flow channel 203 connects the slurry distribution cavity 202 to the lip 600. Between the upper die 100 and the vertical die 300, a purging slit blocking flow channel 303 is formed due to the padding of the vertical die gasket 500, and the purging slit blocking flow channel 303 connects the purging distribution cavity 302 to the lip 600.

[0030] The slurry flow channel includes a slurry inlet channel 201, a slurry distribution cavity 202, and a slurry slit blocking flow channel 203. The slurry distribution cavity 202 is opened in the lower die 200, and the slurry inlet channel 201 is provided on the side of the lower die 200 and communicates with the slurry distribution cavity 202.

[0031] The purging flow channel includes a purging inlet 301, a purging distribution cavity 302, and a purging slit blocking flow channel 303. The purging distribution cavity 302 is opened in the vertical die 300, and the purging inlet 301 is provided on the side of the vertical die 300 and communicates with the purging distribution cavity 302.

[0032] In this embodiment, preferably, the cross-sectional shapes of the slurry distribution cavity 202 and the purging distribution cavity 302 are semi-circular, and are both obtained by transverse sweeping and cutting of this cross-section.

[0033] In this embodiment, the vertical die 300 is fixedly connected to the upper die 100 and the vertical die gasket 500 by screwing bolts into the vertical die fixing hole positions 304 on the left, right, and upper sides of the vertical die 300 and the upper die 100.

[0034] The upper die 100 is provided with a plurality of upper die fixing holes 104. Bolts are screwed into the upper die fixing holes 104 and the lower die 200 to fixedly connect the upper die 100, the main gasket 400 and the lower die 200.

[0035] When used for cleaning, during the shutdown cleaning process, alcohol is pumped into the purge inlet 301. After being laterally distributed through the purge distribution cavity 302, the alcohol passes through the purge slit choke flow channel 303. Due to the contraction of the cross-sectional area of the purge slit choke flow channel 303, the ejection speed of the alcohol increases, thereby purging and cleaning the lip 600.

[0036] According to different working conditions, different cleaning liquids can be pumped into the purge flow channel, which can meet the non-contact cleaning of different coating production processes. Non-contact cleaning can avoid lip damage or personnel scratching accidents caused by manual wiping and cleaning.

[0037] Embodiment 2

[0038] Different from Embodiment 1, the cross-sectional shapes of the slurry distribution cavity 202 and the purge distribution cavity 302 are semi-droplet-shaped, and are both obtained by transverse sweeping and cutting of this cross-section. Others are the same as Embodiment 1.

[0039] Embodiment 3 (Application Embodiment)

[0040] During the production operation process, the lip faces the back roller. The back roller conveys the cloth material for coating. The rotation direction of the back roller is from bottom to top. For specific reference, see Figure 3 the rotation direction in. To prevent the accumulation of slurry above the lip, an inert gas is pumped into the purge inlet 301. After being laterally distributed through the purge distribution cavity 302, the inert gas enters the purge slit choke flow channel 303. Due to the contraction of the cross-sectional area of the purge slit choke flow channel 303, the flow rate of the inert gas increases rapidly, thereby obtaining a large dynamic pressure. The dynamic pressure of the inert gas compresses the surface of the liquid bead, effectively avoiding the slurry from climbing to the lip due to the Coanda effect to form a liquid bead (see Figure 3 the green liquid bead), and further avoiding the influence of the accumulation of liquid beads on the quality of the head and tail of intermittent coating.

[0041] Embodiment 4 (Application Embodiment)

[0042] Air is pumped into the purge inlet 301. After being laterally distributed through the purge distribution cavity 302, the air enters the purge slit choke flow channel 303. Due to the contraction of the cross-sectional area of the purge slit choke flow channel 303, the flow rate of the air increases rapidly, thereby obtaining a large dynamic pressure. The dynamic pressure of the air compresses the surface of the liquid bead, effectively avoiding the slurry from climbing to the lip due to the Coanda effect to form a liquid bead (see Figure 3 the green liquid bead), and further avoiding the influence of the accumulation of liquid beads on the quality of the head and tail of intermittent coating.

[0043] Example 5

[0044] Different from Example 1, there are more than two purging inlets 301 and / or slurry inlet channels 201. Others are the same as in Example 1.

[0045] Example 6

[0046] Different from Example 1, the purging inlet 301 is located at the opposite end of the vertical die 300 near the lip. Others are the same as in Example 1.

[0047] Example 7

[0048] Different from Example 1, the purging inlet 301 is located on the opposite side of the contact surface between the vertical die 300 and the upper die 100. Others are the same as in Example 1.

[0049] As used in this application, the meaning of "and / or" means that both the case of separate existence and the case of simultaneous existence of the two are included.

[0050] As used in this application, the meaning of "connection" can be a direct connection between components or an indirect connection between components through other components.

[0051] Taking the above ideal embodiments based on the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A slit purge type coating die head, comprising an upper die (100), a lower die (200) and a main gasket (400). The main gasket (400) is in a "concave" shape and is clamped between the upper die (100) and the lower die (200). The lower die (200) is provided with a slurry distribution cavity (202) and a slurry inlet channel (201). The slurry inlet channel (201) extends from the slurry distribution cavity (202) to the outside of the lower die (200). The main gasket (400) surrounds the rear side and the left and right sides of the slurry distribution cavity (202). The gap between the front side of the slurry distribution cavity (202) and the lips of the upper die (100) and the lower die (200) forms a slurry slit blocking flow channel (203). The slurry inlet channel (201), the slurry distribution cavity (202) and the slurry slit blocking flow channel (203) are collectively referred to as the slurry flow channel; It is characterized in that A vertical die (300) is provided on the front side of the upper die (100). The vertical die (300) is closely attached and fixed to the front side of the upper die (100). A purge distribution cavity (302) is provided on the side of the vertical die (300) facing the upper die (100). The vertical die (300) is also provided with a purge inlet (301). One end of the purge inlet (301) is communicated with the purge distribution cavity (302), and the other end extends to the surface of the vertical die (300); A vertical die gasket (500) is also laid on the contact surface between the upper die (100) and the vertical die (300). The vertical die gasket (500) is also in a "concave" shape and surrounds the left and right sides of the purge distribution cavity (302) and the side of the purge distribution cavity (302) away from the lips. The gap between the purge distribution cavity (302) and the lips of the upper die (100) and the lower die (200) forms a purge slit blocking flow channel (303). The purge inlet (301), the purge distribution cavity (302) and the purge slit blocking flow channel (303) are called the purge flow channel.

2. The slot die coater head according to claim 1, wherein, One end of the vertical die (300) close to the lips is set as an inclined surface with the same inclination angle as the upper surface of the lips. The gap between the inclined surface and the lips is the air flow channel.

3. The slot die coater head according to claim 1, wherein One or more purge inlets (301) and / or slurry inlet channels (201) are provided.

4. The slot die coater head according to claim 1, characterized in that, The purge inlet (301) is located at the opposite end of the vertical die (300) close to the lips.

5. The slot die coater head according to claim 1, characterized in that, The purge inlet (301) is located on the opposite surface of the contact surface between the vertical die (300) and the upper die (100).

6. The slot die coater head according to claim 1, wherein The cross-sectional shape of the cavity of the slurry distribution cavity (202) and / or the purge distribution cavity (302) is trapezoidal, semi-circular, elliptical or semi-droplet-shaped.

7. The slot die coater head according to claim 1, characterized in that, The vertical die (300) is fixedly connected to the upper die (100) and the vertical die gasket (500) by screwing bolts into a plurality of vertical die fixing holes (304) opened on its left, right and upper sides and the upper die (100).

8. The slot die coater head according to claim 1, wherein The upper die (100) is provided with a plurality of upper die fixing holes (104). Bolts are screwed into the upper die fixing holes (104) and the lower die (200) to fixedly connect the upper die (100), the main gasket (400) and the lower die (200).

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