WO2021022672A1

WO2021022672A1 - Coating device and coating method

Info

Publication number: WO2021022672A1
Application number: PCT/CN2019/111380
Authority: WO
Inventors: 张启发; 梁可
Original assignee: 佛山市金银河智能装备股份有限公司
Priority date: 2019-08-02
Filing date: 2019-10-16
Publication date: 2021-02-11
Also published as: CN110314819A

Abstract

A coating device and a coating method. A base material (8) is positioned between a dynamically suspended roller (1) and a coating head (3). There is a gap between the base material and a uniform gas distributor (14). The coating head and the uniform gas distributor are arranged opposite to each other, such that two sides of the base material can be coated at the same time. Compared with the use of a rigid coating roller, arrangement of a gap enables a base material to have a uniform surface coating density, and prevents the base material from being broken off.

Description

Coating device and coating method

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on August 2, 2019, with the application number 201910713028.2 and the invention title of "a coating device and coating method", the entire content of which is incorporated herein by reference Applying.

Technical field

The invention relates to a coating device and method, in particular to a coating device and a coating method of a powered suspension roller.

Background technique

In the lithium battery front-end equipment industry, the existing extrusion coaters are mainly single-sided coaters, and the coating process structure consists of unwinding-head (coating)-drying-traction-rewinding. In the coating process, both sides of the substrate need to be coated. After the one side is coated, the second side is reversed to complete the overall coating. This will repeat the unwinding of the substrate once and add a coating process. The equipment utilization rate is low, the output is low, and the power consumption is high. Repeated tape coating will cause the quality of the pole piece to change. Frequent use of repeated unwinding and winding will As a result, the physical properties of the battery pole pieces (unstable tension, wrinkle and winding uniformity), chemical properties (slurry content density, electrode ions, etc.) and the floor space of the workshop are greatly increased.

Single-sided coating as shown in Figure 1, the substrate 500 is close to the coating back roll 100, the extrusion coating head 200 is opposite to the coating back roll 100, and the extrusion coating head 200 is connected to the slurry supply system 300. The extrusion coating head 200 uses the slurry provided by the slurry supply system 300 to coat the substrate 500 on one side, and the back side of the substrate cannot have a wet coating due to contact with the coating roller, so double-sided coating cannot be performed Coating at the same time, after coating one side and then reverse coating the second side to complete the overall coating. Due to the rigidity of the coating back roller 100, the substrate is easily squeezed off and the coating head is easily damaged.

As shown in Figure 2, the CN201010147565.4 coating device realizes double-sided coating, but the substrate moves between the upstream guide roller and the downstream guide roller, which requires very strict tension control and insufficient tension control accuracy. Under the circumstances, the substrate is easy to shake, affecting the coating quality; because the substrate moves between the upstream guide roller 1 and the downstream guide roller 2, and the substrate S is in contact with the upstream guide roller 1 and the downstream guide roller 2, in order to To prevent the upstream guide roller 1 from damaging the coating on the back of the substrate S, the second coating roller 4 must be set on the same side and three sides of the downstream guide roller 1, and it must be dried and hardened before passing through the downstream guide roller 2. The part 23 is dried to avoid damage to the back coating by the downstream guide roller 2; although this technology realizes double-sided coating, it has strict requirements on the tension control in the coating device and the setting of the coating roller.

Summary of the invention

In view of this, the present invention provides a coating device and a coating method to solve the problems in the prior art.

A coating device, comprising a power suspension roller, a substrate, and a coating head, the substrate being located between the power suspension roller and the coating head;

A part of the peripheral surface of the power suspension roller is provided with a gas uniformizer, and the substrate moves around the gas uniformizer;

There is a gap between the substrate and the gas homogenizer;

The coating head is arranged opposite to the gas homogenizer;

One side of the substrate is suspended on the peripheral surface of the power suspension roller by a gas uniformizer on the power suspension roller, and the other side of the substrate is coated by the coating head .

Preferably, the coating head is perpendicular to the peripheral surface of the powered suspension roller.

Preferably, a positioning roller for positioning the substrate is provided on the lower side of the coating head.

Preferably, a support roller is arranged below the positioning roller, and the support roller is arranged opposite to the gas homogenizer to maintain a gap, and the substrate passes through the support roller and is placed in the The peripheral surface of the powered suspension roller is suspended.

Preferably, the coating head is an extrusion coating head or a doctor blade coating head, and the coating head is connected to the slurry supply system.

Preferably, the gas homogenizer includes a gas homogenizer mesh plate, a gas homogenizer partition plate, and a gas homogenizer side plate, and the gas homogenizer mesh plate is arranged on the power suspension roller. On the peripheral surface, one end of the side plate of the gas homogenizer is connected with the mesh plate of the gas homogenizer to form a relatively closed space, and the space is separated by the gas homogenizer partition plate. The other end of the side plate of the homogenizer is a gas inlet.

Preferably, the mesh plate of the gas homogenizer is a part of the power suspension roller.

Preferably, the mesh plate of the gas homogenizer is fixedly arranged on the peripheral surface of the power suspension roller by riveting, bolts or welding.

Preferably, the gas inlet is fed with a constant pressure gas through a gas pump.

Preferably, the circumferential angle of the gas homogenizer is less than 180° or equal to 180°.

In addition, this application also provides a coating method based on the above coating device, which includes the following steps:

The base material surrounding the power suspension roller forms a smooth arc surface;

The base material moves around the gas homogenizer under the traction of the power device;

In summary, the present invention provides a coating device and a coating method. There is a certain gap between the power levitation roller and the substrate. After the positive pressure gas enters the power levitation roller, it is evenly distributed by the gas homogenizer. The ejection generates stable pressure on the back of the substrate, so that the substrate forms a smooth and wrinkle-free arc surface and floats without contact with the power suspension roller. The front surface of the substrate is in direct contact with the coating head; because the back of the substrate is in direct contact with the power The suspension roller has a gap. When the back of the substrate has been coated with a wet coating, it can also be coated on the front side, so as to achieve simultaneous coating on both sides of the substrate; because the back of the substrate and the power suspension roller have a gap, Compared with the direct contact with the rigid coating roller, the coating surface density of the substrate is more uniform when there is a gap. Due to the fine buffering of the gap, the substrate will not be squeezed by the particles of the slurry or the substrate splicing joint. Phenomenon: Because there is a gap between the back of the substrate and the power suspension roller, the nozzle of the coating head and the coating roller are prevented from being damaged and the entire coating head is scrapped.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work.

Figure 1 is a schematic diagram of a prior art coating power roller;

Fig. 2 is a schematic diagram of double-sided coating in the prior art;

Figure 3 is a schematic diagram of the coating device of the application;

Figure 4 is a schematic diagram of a gas homogenizer;

Figure 5 is a schematic cross-sectional view of the gas distributor;

Fig. 6 is a schematic diagram of coating of a double-sided coating device of this application;

FIG. 7 is a schematic diagram of coating of a single-sided coating device of this application;

The reference signs in Figure 3-7 are explained as follows:

1. Power suspension roller, 11. Mesh, 12. Shell, 13. Gas inlet, 14. Gas homogenizer, 141. Gas homogenizer mesh plate, 142. Gas homogenizer divider, 143. Side plate of gas uniformizer, 2. Front coating, 3. Front coating head, 4. Front coating slurry supply system, 5. Positioning roller, 6. Support roller, 7. Back coating, 8. Substrate, 9. Gas, 20. Drying box, 21. Drying nozzle, 22. Roller, 30. Back coating head, 31. Back coating slurry supply system, 32. Back coating back roller, 40 .Floating oven, 41. Upwind Tsui, 42. Downwind Tsui.

detailed description

The embodiments of the present invention provide a coating device and a coating method, which are used to solve the problems existing in the prior art.

The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In order to explain the present invention in more detail, a coating device and coating method provided by the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figures 3-7, a coating device includes a powered suspension roller 1, a substrate 8, and a front coating head 3. The substrate 8 is located on the power suspension roller 1 and the front coating head 3. between;

A part of the peripheral surface of the powered levitation roller 1 is provided with a gas homogenizer 14, and the substrate 8 moves around the gas homogenizer 14

There is a gap between the substrate 8 and the gas distributor 14;

The front coating head 3 is arranged opposite to the gas uniformizer 14;

One side of the substrate 8 is suspended on the peripheral surface of the dynamic levitation roller 1 through the gas homogenizer 14 on the power suspension roller 1, and the other side of the substrate 8 passes through the front surface. The coating head 3 performs coating; the front coating head 3 and the substrate 8 may be in direct contact or there may be a certain gap; the front coating head 3 and the substrate 8 may be arranged vertically, and the coating head It can also maintain a certain inclination angle with the peripheral surface of the power suspension roller.

There is a certain gap between the power levitation roller 1 and the base material 8. After the positive pressure gas enters the power levitation roller 1, it is uniformly ejected through the gas homogenizer 14 to generate a stable pressure on the back of the base material 8 to make the base The material 8 forms a smooth and wrinkle-free arc surface and floats without contact with the power suspension roller; since the back of the substrate 8 has a gap with the power suspension roller 1, when the back of the substrate has been coated with a wet coating, The front side can also be coated, so that both sides of the substrate can be coated at the same time; since the back of the substrate has a gap with the dynamic suspension roller, the surface density of the substrate when there is a gap is higher than that of a rigid coating roller in direct contact. Uniformity, due to the fine buffering of the gap, and there will be no phenomenon of the substrate being squeezed by the particles of the slurry or the substrate splicing joint; because the back of the substrate has a gap with the dynamic suspension roller, avoiding the nozzle of the coating head and the coating The collision of the cloth roll caused the entire coating head to be scrapped. The substrate 8 is moved under the traction of the power device. The power suspension roller 1 has a certain non-contact support on the back of the substrate 8. When the front of the substrate 8 is coated by the front coating head 3, the front of the substrate 8 is coated. With a certain pressure, under the bidirectional pressure of the front coating head 3 and the power suspension roller 1, the substrate 8 moves under the traction of the power device to maintain a stable coating state.

In order to make the substrate 8 better maintain a certain gap and be attached to the surface of the power suspension roller 1, the lower side of the front coating head 3 is provided with a positioning roller 5 for positioning the substrate 8. The positioning A support roller 6 is arranged below the roller 5, and the support roller 6 is arranged opposite to the homogenizer to maintain a gap. After the substrate passes through the support roller 6, the power suspension roller 1 The peripheral surface of the suspension roller 6 is used to introduce the substrate 8 into the suspension surface of the power suspension roller 1.

The front coating head 3 is an extrusion coating head, which is connected to the slurry supply system; the front coating head 3 can also be other forms of coating heads such as blade coating Cloth.

As shown in FIGS. 4-5, the gas uniformizer 14 includes a gas uniformizer mesh plate 141, a gas uniformizer partition plate 142, and a gas uniformizer side plate 143.

The mesh plate 141 of the gas homogenizer is arranged on the peripheral surface of the power suspension roller 1, and the mesh plate 141 of the gas homogenizer is densely covered with mesh holes 11. In the scheme shown in FIG. 5, the mesh plate of the gas homogenizer 141 is a double-layer hollow board, the inner and outer layers are both provided with meshes 11, and the inner and outer layers can be integrally formed or formed separately and then detachably assembled together. One end of the side plate 143 of the gas spreader is connected with the mesh plate 141 of the gas spreader to form a relatively closed space. The space is separated by the gas spreader partition plate 142. The other end of the side plate 143 of the homogenizer is a gas inlet 13. The gas inlet 13 passes in a constant-pressure gas 9 through an air pump, a fan and other gas pressurizing devices; the gas homogenizer 14 is installed on the power suspension roller 1 The distributed circumferential angle can be 10 degrees, 30 degrees, 60 degrees, and 90 degrees. Generally, the circumferential angle is less than 180 degrees, preferably 60-120 degrees; of course, it can be equal to 180 degrees. The mesh plate 141 of the gas homogenizer is arranged separately or integrally with the power suspension roller 1, and the mesh plate 141 of the gas homogenizer is a part of the power suspension roller 1 or the gas homogenizer The mesh plate 141 is fixedly arranged on the peripheral surface of the power suspension roller 1 by bolts or welding. The size and number of meshes on the mesh plate 141 of the gas homogenizer can be set according to the actual suspension force.

In addition, this application also provides a coating method implemented according to the above coating device, which includes the following steps:

The base material 8 surrounding the power suspension roller 1 forms a smooth arc surface;

The substrate 8 moves around the gas uniformizer 14 under the traction of the power device;

One side of the substrate 8 is suspended on the peripheral surface of the dynamic levitation roller 1 through the gas uniformizer 14 on the power suspension roller 1, and the other side of the substrate 8 is passed through the coating The cloth head is coated.

As shown in FIG. 6, a double-sided coating device includes a power suspension roller 1, a substrate 8, a front coating head 3, and a front coating slurry supply system 4, and the substrate 8 is located on the power suspension roller. 1 and the front coating head 3; a part of the peripheral surface of the power suspension roller 1 is provided with a gas uniformizer 14, the substrate 8 moves around the gas uniformizer 14; the substrate 8 There is a gap with the gas uniformizer 14; the front coating head 3 is arranged opposite to the gas uniformizer 14; one side of the substrate 8 is uniformly distributed by the gas on the power suspension roller 1 The device 14 provides a stable supporting force to suspend on the peripheral surface of the power suspension roller 1, and the other side of the substrate 8 is coated by the front coating head 3 to form a front coating 2;

A back coating head 30, a back coating slurry supply system 31, and a back coating back roll 32 are provided on the same side downstream of the power suspension roller 1, and the back coating head 30 is connected to the back coating slurry supply system 31, The back coating head 30 coats the back of the substrate 8 to form a back coating 7; since there is a gap between the back of the substrate 8 and the powered suspension roller 1, when the back of the substrate has been coated with a wet coating, It can also be coated on the front side, so that both sides of the substrate can be coated simultaneously;

After the front and back surfaces of the substrate 8 are coated, they enter the floating oven 40, and the substrates coated on the front and back sides are dried through the upper wind nozzle 41 and the lower wind nozzle 42.

As shown in Figure 7, a single-sided coating device includes a powered suspension roller 1, a substrate 8, a front coating head 3, and a front coating slurry supply system 4, where the substrate 8 is located on the power suspension roller. 1 and the front coating head 3; a part of the peripheral surface of the power suspension roller 1 is provided with a gas uniformizer 14, the substrate 8 moves around the gas uniformizer 14; the substrate 8 There is a gap with the gas uniformizer 14; the front coating head 3 is arranged opposite to the gas uniformizer 14; one side of the substrate 8 is uniformly distributed by the gas on the power suspension roller 1 The device 14 provides a stable supporting force to suspend on the peripheral surface of the power suspension roller 1, and the other side of the substrate 8 is coated by the front coating head 3 to form a front coating 2;

There is a certain gap between the power levitation roller 1 and the base material 8. After the positive pressure gas enters the power levitation roller 1, it is uniformly ejected through the gas homogenizer 14 to generate a stable pressure on the back of the base material 8 to make the base The material 8 forms a smooth, wrinkle-free arc surface and suspends without contact with the power suspension roller; since the back of the substrate has a gap with the power suspension roller, compared to direct contact with the rigid coating roller, the substrate is coated with a gap. The surface density is more uniform, due to the fine buffering of the gap, and there will be no phenomenon of the substrate being squeezed by the particles of the slurry or the substrate splicing joint; the back of the substrate and the dynamic suspension roller have a gap, avoiding the nozzle of the coating head The collision between the part and the coating roller caused the entire coating head to be scrapped. The substrate 8 is moved under the traction of the power device. The power suspension roller 1 has a certain non-contact support on the back of the substrate 8. When the front of the substrate 8 is coated by the front coating head 3, the front of the substrate 8 is coated. With a certain pressure, under the bidirectional pressure of the front coating head 3 and the power suspension roller 1, the substrate 8 moves under the traction of the power device to maintain a stable coating state.

After the substrate 8 is coated on the front side, it enters the drying box 20, and the substrate coated on the front side is dried through the drying nozzle 21 and the idler 22.

In summary, the present invention provides a coating device and a coating method. There is a certain gap between the power levitation roller and the substrate. After the positive pressure gas enters the power levitation roller, it is evenly distributed by the gas homogenizer. When spraying, a stable pressure is generated on the back of the substrate, so that the substrate forms a smooth and wrinkle-free arc surface and floats without contact with the power suspension roller; since the back of the substrate has a gap with the power suspension roller, the back of the substrate has been coated When there is a wet coating, it can also be coated on the front side, so that both sides of the substrate can be coated at the same time; because the back of the substrate has a gap with the dynamic suspension roller, it is compared with the rigid coating roller directly. When there is a gap, the coating surface density of the material is more uniform. Due to the fine buffering of the gap, the substrate will not be squeezed by the particles of the slurry or the substrate splicing joint; because the back of the substrate and the dynamic suspension roller have The gap avoids the collision between the nozzle of the coating head and the coating roller and the entire coating head is scrapped; the substrate moves under the traction of the power device, and the power suspension roller has a certain non-contact support on the back of the substrate to produce a certain pressure When the front of the substrate is coated by the front coating head, there is a certain pressure on the front of the substrate. Under the bidirectional pressure of the front coating head and the power suspension roller, the substrate moves under the traction of the power device to maintain A stable coating state.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims

A coating device, characterized in that it comprises a powered suspension roller, a substrate, and a coating head, the substrate being located between the powered suspension roller and the coating head;

A part of the peripheral surface of the power suspension roller is provided with a gas uniformizer, and the substrate moves around the gas uniformizer;

There is a gap between the substrate and the gas homogenizer;

The coating head is arranged opposite to the gas homogenizer;

One side of the substrate is suspended on the peripheral surface of the power suspension roller by a gas uniformizer on the power suspension roller, and the other side of the substrate is coated by the coating head .
The coating device according to claim 1, wherein the coating head is perpendicular to the peripheral surface of the power suspension roller.
The coating device according to claim 2, wherein a positioning roller for positioning the substrate is provided on the lower side of the coating head.
The coating device according to claim 3, wherein a support roller is arranged below the positioning roller, and the support roller and the gas homogenizer are arranged oppositely to maintain a gap, The substrate is suspended on the peripheral surface of the power suspension roller after passing through the support roller.
The coating device according to claim 1, wherein the coating head is an extrusion coating head or a doctor blade coating head, and the coating head is connected to the slurry supply system.
The coating device according to claim 5, wherein the gas distributor comprises a mesh plate of the gas distributor, a partition plate of the gas distributor, and a side plate of the gas distributor. The mesh plate of the homogenizer is arranged on the peripheral surface of the power suspension roller, and one end of the side plate of the gas homogenizer is connected with the mesh plate of the gas homogenizer to form a relatively closed space. The gas uniformizer is separated by a partition plate, and the other end of the side plate of the gas uniformizer is a gas inlet.
The coating device according to claim 6, wherein the mesh plate of the gas homogenizer is a part of the power suspension roller.
The coating device according to claim 6, wherein the mesh plate of the gas homogenizer is fixedly arranged on the peripheral surface of the power suspension roller by riveting, bolts or welding.
The coating device according to claim 6, wherein the gas inlet is fed with a constant pressure gas through an air pump.
The coating device according to claim 7 or 8, wherein the circumferential angle of the gas homogenizer is less than 180 degrees or equal to 180 degrees.
A coating method implemented based on a coating device according to any one of claims 1-10, characterized in that it comprises the following steps:

The base material surrounding the power suspension roller forms a smooth arc surface;

The base material moves around the gas homogenizer under the traction of the power device;

One side of the substrate is suspended on the peripheral surface of the power suspension roller by a gas uniformizer on the power suspension roller, and the other side of the substrate is coated by the coating head .