CN112337761A

CN112337761A - Curtain coating method

Info

Publication number: CN112337761A
Application number: CN202011364433.7A
Authority: CN
Inventors: 向祖勇; 田世彬; 肖家仁; 李超; 陈林; 倪文平; 杨军; 廖代高; 刘加国
Original assignee: Chongqing Special Star Suit Door Group Co ltd
Current assignee: Chongqing Special Star Suit Door Group Co ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-02-09

Abstract

The invention belongs to the technical field of coating, and particularly discloses a curtain coating method, which comprises the following steps of S1: adjusting the flow coating gap to be controlled between 0.07mm and 0.09 mm; s2: forming an oil curtain, and guiding the prepared coating into the curtain coating gap; s3: placing a plate, and placing the plate to be coated on a conveying belt according to a preset direction; s4: and (3) spraying, starting the conveyor belt, controlling the conveying speed of the conveyor belt to be 6-8m/min, enabling the conveyor belt to drive the plate to move towards the lower part of the oil curtain at a constant speed, and enabling the coating to flow onto the plate to spray the plate when the plate passes through the oil curtain. According to the scheme, the paint is prepared into the coating with the corresponding viscosity, and the size of the spraying gap is adjusted according to the viscosity, so that the coating can form an even oil curtain at the spraying gap, and the coating of the plate is more even. And the size of the curtain coating gap can be adjusted to control the thickness of the paint film in the using process, the quality requirement can be met by one-time curtain coating, the efficiency is improved, and the labor and the time are saved.

Description

Curtain coating method

Technical Field

The invention belongs to the technical field of coating, and particularly relates to a curtain coating method.

Background

The surface of the plates such as door panels, decorative panels and wall panels is usually provided with a finish layer, and the prior art for implementing the finish layer mainly comprises brushing, spraying, rolling and the like.

The brushing and rolling process has the advantages that using tools are simple, construction is convenient, the brushing and rolling process is almost purely manual operation, production efficiency is low, labor intensity is high, brushing marks are easy to leave, the thickness of the coating is uneven, the flatness and the decoration effect of a flat coating are affected, and due to the fact that the working environment is poor, the rolling or brushing is purely manual operation for a long time, and the health of workers is not facilitated.

The spraying process has high production efficiency, is suitable for manual operation and industrial automatic production, but the spraying efficiency is improved by a method of adding a large amount of diluting solvent in the coating process, and the volatilization amount of organic solvent and the volatilization amount of highly dispersed atomized substances can be greatly increased in the process, so that the environmental pollution is caused, and the human health is harmed. Meanwhile, the material is usually sprayed in an atomized manner, so that the material is easily sprayed to the periphery of the substrate in the actual coating process, and the material waste is caused.

Disclosure of Invention

The invention aims to provide a flow coating method, which can adjust the size of a flow coating gap to control the thickness of a paint film in the using process, so that the processed product paint film is plump, the defects of seeds, oil and the like cannot be generated, and the product quality is improved.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a curtain coating method comprises the following steps,

s1: adjusting the spraying gap, and controlling the size of the spraying gap to be between 0.07 and 0.1mm, wherein the spraying gap is the gap between the two spraying plates, and the two spraying plates are driven to move during adjustment so as to adjust the spraying gap between the two spraying plates;

s2: forming an oil curtain, guiding the coating to be coated into the curtain coating gap, and allowing the coating to flow downwards through the curtain coating gap to form a uniform oil curtain;

s3: placing a plate, and placing the plate to be coated on a conveyor belt according to a preset direction, wherein the conveyor belt is positioned below the curtain coating gap;

s4: and (3) spraying, starting the conveyor belt, controlling the conveying speed of the conveyor belt to be 6-8m/min, enabling the conveyor belt to drive the plate to move towards the lower part of the oil curtain at a constant speed, and enabling the coating to flow onto the plate to spray the plate when the plate passes through the oil curtain.

Further, in step S2, the viscosity of the paint is 17-18Pa · S.

Further, in step S2, the paint is introduced into a bin communicated with the curtain coating gap, the bin comprises a baffle and a bin body which are opposite and separable, the baffle and the bin body can be combined to form a complete bin, and the two curtain coating plates are respectively fixed on the lower parts of the opposite sides of the baffle and the bin body.

Furthermore, a driving mechanism is arranged between the baffle and the bin body, the driving mechanism comprises a screw rod arranged on the bin body and a power assembly driving the screw rod to rotate, the bin body is fixedly connected to the conveying table, a nut seat matched with the screw rod is fixed on the baffle, and a guide post is further arranged between the baffle and the bin body.

Furthermore, the power assembly comprises a worm gear transmission mechanism, the input end of the worm gear transmission mechanism is connected with a rocking handle, and the screw is fixedly connected with the output end of the worm gear transmission mechanism.

Further, still include coating circulation mechanism, coating circulation mechanism includes the baffle box, and the baffle box sets up in the delivery platform middle part and lies in under the drenching and scribble clearance, and the baffle box exit end is equipped with the storage case, is connected with charge-pump and conveying pipe between storage case and the feed bin.

Furthermore, the driving mechanisms are two, the two driving mechanisms are respectively positioned at two ends of the bin body, and a transmission shaft is connected between power components of the two driving mechanisms.

The beneficial effect of this scheme: according to the scheme, the paint is prepared into the coating with the corresponding viscosity, and the size of the spraying gap is adjusted according to the viscosity, so that the coating can form an even oil curtain at the spraying gap, and the coating of the plate is more even. And the size of the curtain coating gap can be adjusted to control the thickness of the paint film in the using process, the quality requirement can be met by one-time curtain coating, the efficiency is improved, and the labor and the time are saved.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

fig. 2 is a top view of an embodiment of the present invention;

fig. 3 is a cross-sectional view of the baffle and cartridge body of an embodiment.

Reference numerals in the drawings of the specification include: conveying table 1, feeding table 101, discharging table 102, stock bin 2, bin body 201, baffle 202, first supporting plate 3, second supporting plate 4, first drench and scribble board 5, second drench and scribble board 6, lead screw 7, guide post 8, rocking handle 9, worm gear drive mechanism 10, storage tank 11, feeding pump 12, conveying pipe 13, transmission shaft 14, conveyer belt 15, baffle box 16.

Detailed Description

The following is further detailed by way of specific embodiments:

example 1

The embodiment is basically as shown in the attached figures 1 to 3: in the embodiment, the curtain coating device comprises a conveying table 1 and a curtain coating mechanism arranged on the conveying table 1, the conveying table 1 comprises a feeding table 101 and a discharging table 102, the feeding table 101 and the discharging table 102 are opposite left and right, a certain distance is formed between the feeding table 101 and the discharging table 102, and the distance is an installation gap. The feeding table 101 and the discharging table 102 are both provided with a conveyor belt structure, and the two conveyor belt structures are both arranged in left and right directions.

The curtain coating mechanism comprises a bin 2, the bin 2 comprises a baffle 202 and a bin body 201 which are right opposite to each other, and the baffle 202 and the bin body 201 can be combined to form the complete bin 2 when being connected. The baffle 202 is a plate-shaped member, which is equivalent to the left side plate of the silo 2, the silo body 201 is a silo body with a cavity inside and an opening at the left part, and the whole bottom wall inside the silo body 201 is an inclined plane with a high right and a low left.

The welding of baffle 202 bottom has first backup pad 3, and the welding of the 3 both ends of first backup pad extend to the baffle 202 both ends outside, and the welding of storehouse body 201 bottom has second backup pad 4, and the 4 both ends of second backup pad extend to the storehouse body 201 both ends outside. First backup pad 3 and second backup pad 4 all are located the top of carrying platform 1, and wherein, second backup pad 4 fixed bit is directly over the installation clearance, specifically, 4 both ends of second backup pad are respectively through the fix with screw has the riser, and the riser lower extreme passes through screw fixed connection with pan feeding platform 101 side. Still be equipped with the slip direction subassembly between first backup pad 3 and the second backup pad 4, the slip direction subassembly includes two guide posts 8, two guide posts 8 are fixed respectively on the lower surface at 4 both ends of second backup pad, be fixed with on the lower surface at 3 both ends of first backup pad with 8 complex guide holders of guide post, guide post 8 and guide holder sliding fit make first backup pad 3 can follow about guide post 8, realize baffle 202 and the cooperation and the separation of the storehouse body 201.

Still be equipped with actuating mechanism between first backup pad 3 and the second backup pad 4, actuating mechanism includes lead screw 7, nut seat and drive lead screw 7 pivoted power component, power component is including the worm gear drive mechanism 10 that is fixed in 4 tip upper surfaces of second backup pad, worm gear drive mechanism 10 is current worm gear reduction gear, no longer describe in this embodiment, lead screw 7 fixed coordination is at the output of worm gear drive mechanism 10, be fixed with the nut seat with lead screw 7 screw-thread fit through the mode of screw connection on the first backup pad 3. The input end of the worm gear transmission mechanism 10 can be connected with power sources such as a motor, in the embodiment, the input end of the worm gear transmission mechanism 10 is fixedly matched with the rocking handle 9, and during use, the rocking handle 9 is shaken to drive the screw rod 7 to rotate, so that the first supporting plate 3 is driven to move left and right. In order to improve the motion precision of the first supporting plate 3, the other end of the second supporting plate 4 is correspondingly provided with a screw rod 7, a nut seat and a worm and gear transmission mechanism 10, and a transmission shaft 14 is connected between rotating shafts corresponding to rocking handles 9 in the worm and gear transmission mechanisms 10 at two ends, so that the screw rods 7 at two ends can be driven to rotate simultaneously when the rocking handles 9 are rotated, and the synchronous motion of two ends of the first supporting plate 3 is ensured.

The bottom welding of baffle 202 right flank has first drench and scribble board 5, and the bottom welding of storehouse body 201 left surface has second drench and scribble board 6, and first drench and scribble board 5 and second drench and scribble board 6 and control just right, and the clearance that first drenches and scribble between board 5 and the second drench and scribble the board 6 is drenched the clearance. In this embodiment, the first and

second shower plates

5 and 6 are both flat plates with tetrafluoroethylene coating layers on the surfaces, and in some embodiments, the first and

second shower plates

5 and 6 may also be shaped plates, for example, the second shower plate 6 is an inclined plate, and the first shower plate 5 is a flat lamp. The tetrafluoroethylene coating enables the coating to smoothly flow downwards from the curtain coating gap to form an oil curtain, and the loss of the coating is avoided, so that the coating of the product is more uniform.

This curtain coating device still includes coating circulation mechanism, coating circulation mechanism includes baffle box 16, storage tank 11 and delivery pump 12, storage tank 11 is located the conveying platform 1 outside, delivery pump 12 sets up on storage tank 11, baffle box 16 passes through the fix with screw in the installation clearance between pan feeding platform 101 and ejection of compact platform 102, and baffle box 16 is for setting up towards the low high slope of the other end of 11 one end of storage tank, the intercommunication has the conveyer pipe between baffle box 16 and the storage tank 11, the intercommunication has conveying pipe 13 between delivery pump 12 and the storehouse body 201 inside, conveying pipe 13 tip is located the right side of storehouse body 201 inside, the coating that makes conveying pipe 13 carry can be followed the diapire of the storehouse body 201 and flowed downwards.

When the curtain coating method is implemented by using the device, the method comprises the following steps,

s1: adjusting a spraying gap, controlling the size of the spraying gap to be 0.07-0.1mm, in the implementation, shaking a handle to adjust the spraying gap between two first spraying plates and a second spraying plate, so that the size of the spraying gap is 0.07-0.1mm, and ensuring that a uniform oil curtain can be formed when the coating flows down from the spraying gap, when the spraying gap is smaller than 0.07mm, the coating can be blocked and cannot form a complete oil curtain, when the spraying gap is larger than 0.1mm, the coating thickness of a product cannot meet the process requirements, when the gap is too large, for example 1mm, the first spraying plate and the second spraying plate have small effects on the coating, so that the flow of the oil curtain is large and uneven, and the size of the spraying gap is positively correlated with the coating thickness required by the plate;

s2: forming an oil curtain, preparing a coating, controlling the viscosity of the coating to be 17-18 Pa.s, guiding the prepared coating into a storage box, starting a feeding pump, controlling the output flow of the feeding pump to convey the coating into a storage bin, and allowing the coating in the storage bin to flow downwards after passing through a spraying gap to form a uniform oil curtain;

s3: placing a plate, and placing the plate to be coated on a conveying belt according to a preset direction;

s4: and (3) spraying, starting the conveyor belt, controlling the conveying speed of the conveyor belt to be 6-8m/min, enabling the conveyor belt to drive the plate to move below the oil curtain at a constant speed, enabling the coating to flow onto the plate when the plate passes through the oil curtain to spray the plate, and influencing the uniformity and thickness of the coating when the speed of the conveyor belt is too high or too low, for example, the larger the required coating thickness is, the smaller the conveying speed is.

According to the above steps, the coating viscosity and the conveying speed are taken as variables, the flow coating gap is taken as a fixed quantity, and the coating is taken as a result quantity in the embodiment to carry out test comparison, so as to obtain the following results, see the following table, wherein the coating thickness of 0.08mm is the standard thickness of the scheme.

Viscosity of paint	Speed of conveyance	Flow coating gap	Thickness of coating
				17-18Pa·s	4m/min	0.08mm	0.095mm
17-18Pa·s	6m/min	0.08mm	0.085mm
				17-18Pa·s	7m/min	0.08mm	0.08mm
17-18Pa·s	8m/min	0.08mm	0.076mm
				17-18Pa·s	10m/min	0.08mm	0.062mm
10Pa·s	7m/min	0.08mm	0.09mm
				25Pa·s	7m/min	0.08mm	0.078mm

From the above table, when the viscosity of the coating is 17-18Pa · s and the conveying speed is 7m/min, the coating thickness corresponds to the value of the curtain coating gap, i.e. the coating thickness is 0.08 when the curtain coating gap is 0.08 mm. When the conveying speed is less than 7m/min, the coating thickness is larger than the curtain coating gap and the smaller the conveying speed is, the larger the coating thickness is, whereas when the conveying speed is greater than 7m/min, the coating thickness is smaller than the curtain coating gap and the larger the conveying speed is, the smaller the coating thickness is. And when the conveying speed is maintained at 7m/min, the smaller the viscosity of the coating material is, the larger the thickness of the obtained coating layer is, and the larger the viscosity of the coating material is, the smaller the thickness of the obtained coating layer is.

Example 2

In this embodiment, the conveying table of the curtain coating device is further provided with a plurality of clamping assemblies, each clamping assembly comprises a first clamping plate, a second clamping plate, a first sliding plate and a second sliding plate, guide rails are fixedly mounted on both sides of the conveying table, the first sliding plate and the second sliding plate are respectively slidably mounted in the two guide rails, the first clamping plate and the second clamping plate are respectively mounted on one side of the first sliding plate opposite to the second sliding plate, wherein the first clamping plate fixes the inner side of the first sliding plate through a buckle or a screw, the second clamping plate is in sliding fit with the second sliding plate, specifically, one side of the second clamping plate close to the second sliding plate is in threaded connection with a sliding rod, the second sliding plate is provided with a sliding hole in sliding fit with the sliding rod, one end of the sliding rod, far away from the second clamping plate, is located on the outer side of the second sliding plate and is in threaded connection with a limiting block, the limiting block is used, in this embodiment, the elastic member is a spring sleeved on the sliding rod, the spring is always in a compressed state, and the second clamping plate is away from the second sliding plate under the elastic force.

Correspondingly, when the plate is placed in the step S3 of the curtain coating method, the plate is placed between the first clamping plate and the second clamping plate, and under the action of the elastic member, the first clamping plate and the second clamping plate clamp the plate tightly and make the plate tightly attached to the first clamping plate, so that the plate does not shake due to the impact force of the oil curtain, and the uniformity of the coating during curtain coating is ensured. And the elastic component makes and has comparatively nimble tight interval of clamp between first splint and the fly leaf, can adapt to the panel of different width, and can make panel all be close to first splint and forward conveying, realizes the location of panel, provides the direction for the motion of panel simultaneously.

Example 3

In the embodiment, the first clamping plates with various shapes and specifications are arranged, the upper profiles of the various first clamping plates correspond to the upper profiles of the various plates respectively, when one plate is coated by spraying, the first clamping plates corresponding to the upper profiles of the plates are arranged on the first sliding plate, and the upper profiles of the first clamping plates are matched with the upper profiles of the plates.

In addition, in this embodiment, the first shower plate 5 is slidably mounted at the bottom of the right side surface of the baffle 202, specifically, a vertical T-shaped groove is formed in the right side surface of the bottom of the baffle 202, and a slider matched with the T-shaped groove is fixed at the top of the left side surface of the first shower plate 5, so that the first shower plate 5 can be lifted along the right side surface of the baffle 202. Similarly, the second shower plate 6 is also slidably mounted to the bottom of the right side of the cabin 201 by means of a sliding fit structure similar to that of the first shower plate 5. The bottom of the second curtain coating plate is fixedly connected with a supporting rod through a screw, the lower end of the supporting rod is rotatably connected with a roller, the roller is located on the motion track of the first clamping plate, and the front end of the first clamping plate is provided with a convenient roller motion inclined plane.

Correspondingly, in step S4 of the curtain coating method, when the plate passes under the oil curtain, the first and second curtain coating plates can be lifted and lowered by the cooperation between the first clamping plate and the roller, so that the distance between the oil curtain and the plate is always consistent, the impact force of the paint on the plate is kept consistent, the uniformity of the paint layer on the plate is ensured, and the curtain coating method is suitable for plates with a surface having a lot of concave-convex shapes.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. A curtain coating method is characterized in that: comprises the following steps of (a) carrying out,

2. A flow coating method according to claim 1, characterized in that: in step S2, the viscosity of the paint is 17-18Pa · S.

3. A flow coating method according to claim 1 or 2, characterized in that: in the step S2, the paint is introduced into the stock bin (2) communicated with the curtain coating gap, the stock bin (2) comprises a baffle (202) and a bin body (201) which are opposite and separable, the baffle (202) and the bin body (201) can be combined to form the complete stock bin (2), and the two curtain coating plates are respectively fixed on the lower parts of the opposite sides of the baffle (202) and the bin body (201).

4. A flow coating method according to claim 3, characterized in that: be equipped with actuating mechanism between baffle (202) and the storehouse body (201), actuating mechanism is including setting up lead screw (7) and the power component of drive lead screw (7) pivoted on the storehouse body (201), and storehouse body (201) and transport platform (1) fixed connection are fixed with on baffle (202) with lead screw (7) complex nut seat, still are equipped with between baffle (202) and the storehouse body (201) guide post (8).

5. A flow coating method according to claim 4, characterized in that: the power assembly comprises a worm gear transmission mechanism (10), the input end of the worm gear transmission mechanism (10) is connected with a rocking handle (9), and the screw rod (7) is fixedly connected with the output end of the worm gear transmission mechanism (10).

6. A flow coating method according to claim 4 or 5, characterized in that: the coating circulating mechanism comprises a guide chute (16), the guide chute (16) is arranged in the middle of the conveying platform (1) and is located right below the spraying gap, a storage box (11) is arranged at the outlet end of the guide chute (16), and a feeding pump (12) and a feeding pipe (13) are connected between the storage box (11) and the storage bin (2).

7. A flow coating method according to claim 4 or 5, characterized in that: the two driving mechanisms are respectively positioned at two ends of the bin body (201), and a transmission shaft (14) is connected between power components of the two driving mechanisms.

8. A flow coating method according to claim 6, characterized in that: the two driving mechanisms are respectively positioned at two ends of the bin body (201), and a transmission shaft (14) is connected between power components of the two driving mechanisms.