CN111103213B - Coating surface density detection device and method - Google Patents

Abstract

The invention discloses a device and a method for detecting the surface density of a coating. The device includes: the thickness detection module is used for detecting the total thickness of the multilayer coating to be detected; the surface density detection module is used for detecting the total surface density of the multilayer coating to be detected; and the detection control module is used for calculating the surface density of each layer of coating in the multi-layer coating to be detected based on the total thickness and the total surface density. According to the embodiment of the invention, the detection of the areal density of each coating can be realized.

Description

Coating surface density detection device and method

technical field

The invention relates to the field of coating, in particular to a coating surface density detection device and method.

Background technique

Precision coating technology has become one of the important basic technologies for industries such as electronics, automobiles, construction, packaging, photography, medicine and clothing. In order to meet various requirements such as product multi-function, safety and process mass production, more and more products (secondary batteries, pressure sensitive adhesives, optical films, photographic films and magnetic tapes, etc.) need to design multi-layer structures. Compared with multiple single-layer coating technology, one-time multi-layer coating technology has the advantages of improving efficiency, saving cost, reducing dislocation and improving density.

In order to improve the quality yield of the coating in the one-shot multilayer coating technology, it is necessary to monitor the areal density of each coating layer. However, devices such as radiation source measurement systems, laser thickness gauges or ultrasonic thickness gauges cannot fully reflect the coating quality of each layer. At present, the areal density of the coating is generally monitored by controlling the slurry delivery ratio (screw pump flow rate), the solid content of the slurry or measuring the total areal density. However, the current areal density detection methods are affected by factors such as slurry viscosity, sedimentation, pump speed stability, etc., and cannot accurately obtain the areal density of each layer of the multi-layer coating.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a coating areal density detection device and method, which can obtain the areal density of each coating layer, thereby improving the quality yield of the multi-layer coating.

According to an aspect of the embodiments of the present invention, a coating surface density detection device is provided, the device comprising:

Thickness detection module, used to detect the total thickness of the multi-layer coating to be tested;

The areal density detection module is used to detect the total areal density of the multi-layer coating to be tested;

The detection control module is used to calculate the areal density of each coating in the multi-layer coating to be tested based on the total thickness and the total areal density.

In one embodiment, the detection control module is configured to calculate the areal density of each coating based on the total thickness, the total areal density and the pre-obtained bulk density of each coating.

In one embodiment, the apparatus further includes an adjustment amount calculation module for, for each coating layer, calculating an average areal density of the coating based on a plurality of areal densities of the coating, and calculating based on the average areal density of the coating The adjustment amount of the flow parameter of the flow adjustment component corresponding to the coating is to adjust the slurry flow corresponding to the coating.

In one embodiment, the adjustment amount calculation module is specifically used for each layer of coating, if the average areal density of the coating satisfies the preset adjustment condition corresponding to the coating, the flow parameter of the flow adjustment component corresponding to the coating The adjustment amount of the coating is zero. If the average areal density does not meet the preset adjustment conditions, the adjustment amount is calculated based on the preset areal density corresponding to the coating and the average areal density.

In one embodiment, the device further includes a flow rate adjustment module for adjusting the flow rate parameter for each coating layer based on the adjustment amount of the flow rate parameter of the flow rate adjustment component corresponding to the coating layer, so as to adjust the slurry corresponding to the coating layer flow.

In one embodiment, the flow regulation module includes:

A sub-module for subsection adjustment, for each layer of coating, if the adjustment amount of the coating is in the preset flow parameter range, then the flow parameter is adjusted in sections based on the adjustment amount of the flow parameter of the flow adjustment component corresponding to the coating .

In one embodiment, if the flow adjustment component is a screw pump, the flow parameter is the pump speed of the screw pump, the first endpoint of the preset flow parameter interval is 0.8 revolutions per second, and the second endpoint of the preset flow parameter interval is 1.5 revolutions per second.

In one embodiment, if the multi-layer coating to be tested comprises two layers; wherein,

The detection control module is used to calculate the areal density m ₁ of the first of the two coatings based on the following expression:

m ₁ =(hm/ρ ₂ )×ρ ₁ ρ ₂ /(ρ ₂ −ρ ₁ )

The detection control module is used to calculate the areal density m ₂ of the second of the two coatings based on the following expression:

m ₂ =(m/ρ ₁ -h)×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ )

Among them, h is the total thickness, m is the total areal density, ρ ₁ is the bulk density of the first coating, and ρ ₂ is the bulk density of the second coating.

In one embodiment, the flow regulating component is a screw pump or a return valve; wherein,

If the flow adjustment component is a screw pump, the flow parameter is the pump speed of the screw pump;

If the flow adjustment component is a return valve, the flow parameter is the opening of the return valve.

In one embodiment, for each coating, the areal densities of the coating include areal densities of the coating at locations along the first direction and areal densities of the coating at locations along the second direction Areal density.

In one embodiment, the first direction is perpendicular to the second direction.

According to another aspect of the embodiments of the present invention, a method for detecting the surface density of a coating is improved, the method comprising:

Obtain the total thickness of the multi-layer coating to be tested and the total areal density of the multi-layer coating to be tested;

Calculate the areal density of each coating in the multilayer coating to be tested based on the total thickness and total areal density.

In one embodiment, the areal density of each layer of the multilayer coating to be tested is calculated based on the total thickness and the total areal density, including:

The areal density of each coating is calculated based on the total thickness, the total areal density, and the pre-obtained bulk density of each coating.

In one embodiment, if the multi-layer coating to be tested comprises two layers; wherein,

The areal density m ₁ of the first of the two coatings is calculated using the following expression:

m ₁ =(hm/ρ ₂ )×ρ ₁ ρ ₂ /(ρ ₂ −ρ ₁ )

The areal density m ₂ of the second of the two coatings is calculated using the following expression:

m ₂ =(m/ρ ₁ -h)×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ )

Among them, h is the total thickness, m is the total areal density, ρ ₁ is the bulk density of the first coating, and ρ ₂ is the bulk density of the second coating.

According to the coating areal density detection device and method provided by the embodiments of the present invention, by combining the total thickness of the multi-layer coating to be measured and the total areal density, the detection of the areal density of each coating is realized, thereby realizing monitoring of each coating surface density. The quality of each layer of coating is improved, and the quality yield of each layer of coating is improved.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments of the present invention will be briefly introduced below. For those of ordinary skill in the art, without creative work, the Additional drawings can be obtained from these drawings.

1 is a schematic structural diagram of a coating surface density detection device provided by some embodiments of the present invention;

2 is a schematic structural diagram of a coating surface density detection device provided by other embodiments of the present invention;

3 is a schematic flowchart of a coating areal density detection method provided by some embodiments of the present invention;

FIG. 4 is a schematic flowchart of a coating areal density detection method provided by other embodiments of the present invention.

Detailed ways

The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention, and are not configured to limit the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by illustrating examples of the invention.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element defined by the phrase "comprises" does not preclude the presence of additional identical elements in a process, method, article, or device that includes the element.

FIG. 1 shows a schematic structural diagram of a coating areal density detection device provided by an embodiment of the present invention. As shown in FIG. 1 , the coating surface density detection device includes a thickness detection module 101 , an areal density detection module 102 and a detection control module 103 .

The thickness detection module 101 is used to detect the total thickness of the multi-layer coating to be measured.

The areal density detection module 102 is used to detect the total areal density of the multi-layer coating to be tested.

The detection control module 103 is configured to calculate the areal density of each layer of the multi-layer coating to be tested based on the total thickness and the total areal density.

In the embodiment of the present invention, the detection control module 103 is connected to the thickness detection module 101 for receiving the total thickness of the multilayer coating to be measured from the thickness detection module 101 . The connection manner of the detection control module 103 and the thickness detection module 101 is not specifically limited.

In the embodiment of the present invention, the detection control module 103 is connected to the areal density detection module 102 for receiving the total areal density of the multilayer coating to be tested from the areal density detection module 102 . The connection manner between the detection control module 103 and the areal density detection module 102 is not specifically limited.

In some embodiments of the present invention, the multilayer coating to be tested is a coating applied using a coater with a one-shot multilayer coating technique. The multi-layer coating to be tested can be a reflective coating such as an optical film, or a black non-effective reflective coating coated on a secondary battery. The embodiments of the present invention do not specifically limit the type and coating technology of the multilayer coating.

In the embodiment of the present invention, the thickness detection module 101 may be a thickness gauge. For reflective coatings such as optical films, a near-infrared thickness gauge can be used. The near-infrared thickness gauge can measure the total thickness of the multi-layer coating to be measured by using the interference principle of low-coherence light waves reflected at the interface of different layers. That is, the thickness gauge may not be in contact with the multilayer coating to be measured.

In other embodiments of the present invention, for the black non-reflective coating coated on the secondary battery, an ultrasonic thickness gauge can be used to measure the total thickness of the multi-layer coating to be measured.

Among them, the ultrasonic thickness gauge is based on the principle of ultrasonic pulse reflection to measure the thickness. When the ultrasonic pulse emitted by the probe of the ultrasonic thickness gauge passes through the object to be measured and reaches the interface, the pulse is reflected back to the probe. The total thickness of the multi-layer coating to be tested can be determined by accurately measuring the time and speed of the ultrasonic waves in the material. For different types of multi-layer coatings to be tested, different types of thickness gauges can be selected for testing, which is not limited here.

In some examples, the thickness detection module 101 may detect the total thickness of the multi-layer coating to be tested at preset time intervals. As a specific example, the thickness detection module 101 measures the total thickness of the multi-layer coating to be measured at the central part of the width of the multi-layer coating, and the specific measurement position of the thickness gauge is not specifically limited here. The transverse direction of the width of the multi-layer coating is the width direction of the coating.

In the embodiment of the present invention, the areal density detection module 102 may be an areal density measuring instrument, also referred to as a weighing instrument. The gravimeter can be an X-ray gravimeter (requiring the atomic number of the coating element to be higher than that of the substrate) or a beta-ray gravimeter.

When the ray emitted by the areal density measuring instrument acts on the multi-layer coating to be tested, the ray will be absorbed, reflected or scattered by the multi-layer coating to be tested, resulting in the intensity of the ray after penetrating the multi-layer coating to be tested relative to the incident ray The intensity has a certain attenuation. The attenuation ratio has a negative exponential relationship with the areal density of the multilayer coating to be tested. The total areal density of the multi-layer coating to be tested can be obtained by detecting the radiation intensity before and after the radiation acts on the multi-layer coating to be tested. Wherein, the weighing instrument may not be in contact with the multi-layer coating to be measured.

In some examples, the weight measuring instrument measures the total areal density of the multi-layer coating at the central position in the transverse direction of the width of the multi-layer coating, and the specific measurement position of the weight measuring instrument is not specifically limited herein.

Referring to Fig. 1, the multi-layer coating head 104, back roll 105, and winding unit 106 of the coater are also shown. Among them, the back roller 105 is arranged on one side of the coating machine and is used for conveying the substrate. The multi-layer coating head 104 is used for coating the slurry provided by the feeding unit of the coating machine on the substrate conveyed by the back roller 105 . The oven in the coating machine dries the multi-layer coating applied by the multi-layer coating head 104 and is then wound by the winding unit 106 .

In addition, the coating machine also includes flow adjustment components such as the screw pump and the return valve of the screw pump. Among them, each layer of coating has a corresponding screw pump and return valve. For any coating, by adjusting the flow parameters of the flow regulating component corresponding to the coating, the slurry flow rate corresponding to the coating can be adjusted to control the areal density of the coating. For example, the flow parameter of the screw pump is the pump speed of the screw pump, and the flow parameter of the return valve is the opening of the return valve.

In some embodiments of the present invention, the thickness gauge and the weight gauge are respectively set at the lower temperature dry film after the multilayer coating is out of the oven, and are used to measure the total thickness of the multilayer coating to be measured and the thickness of the multilayer coating, respectively. The total areal density of the layer.

The coating areal density detection device provided by the embodiment of the present invention can accurately calculate the areal density of each coating by combining the total areal density and the total thickness of the multi-layer coating, thereby realizing the detection of the areal density of each coating. Monitoring is carried out to improve the quality yield of each coating.

In the embodiment of the present invention, after the thickness gauge detects the total thickness of the multi-layer coating to be measured, the total thickness of the multi-layer coating to be measured is sent to the detection control module 103 . After the weighing instrument detects the total areal density of the multi-layer coating to be tested, the total areal density of the multi-layer coating to be tested is sent to the detection control module 103 .

After the detection control module 103 receives the total thickness and total areal density of the multi-layer coating to be tested, it calculates each layer based on the total thickness, total areal density of the multi-layer coating and the pre-obtained bulk density of each layer. The areal density of the layer.

As an example, if the multi-layer coating to be tested includes two layers, it is assumed that the obtained bulk density of the first coating layer is ρ ₁ , the bulk density of the second layer coating is ρ ₂ , and h is the multi-layer coating to be tested. The total thickness of the coating, m is the total areal density of the multi-layer coating to be tested, the following two relations can be obtained:

m ₁ +m ₂ =m (1)

m ₁ /ρ ₁ +m ₂ /ρ ₂ =h (2)

The areal density m ₁ of the first coating layer and the areal density m ₂ of the second coating layer can be calculated based on Expression (1) and Expression (2).

Wherein, the detection control module 103 can calculate the areal density m ₁ of the first coating among the two coatings based on the following expression (3):

m ₁ =(hm/ρ ₂ )×ρ ₁ ρ ₂ /(ρ ₂ −ρ ₁ ) (3)

The detection control module 103 can calculate the areal density m ₂ of the second coating of the two coatings based on the following expression (4):

m ₂ =(m/ρ ₁ -h)×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ ) (4)

In some embodiments of the present invention, in order to improve product consistency, stability and production efficiency and reduce defective rate, as shown in FIG. 2 , the coating surface density detection device further includes an adjustment amount calculation module 107 and a flow adjustment module 108 .

Wherein, for each coating layer, the adjustment amount calculation module 107 calculates the average areal density of the coating based on a plurality of areal densities of the coating, and calculates the flow rate of the flow control assembly of the coating according to the average areal density of the coating The adjustment amount of the parameter. Wherein, the adjustment amount calculation module 107 is connected to the detection control module 103 , and is used for acquiring a plurality of areal densities of each coating from the detection control module 103 .

The flow adjustment module 108 is used to control the flow adjustment components corresponding to each coating layer. Wherein, the flow adjustment module 108 is connected to the adjustment amount calculation module 107, and is used for receiving the adjustment amount of the flow parameter of the flow adjustment component corresponding to each coating from the adjustment amount calculation module 107.

Specifically, for each layer of coating, the flow adjustment module 108 adjusts the flow parameter based on the received adjustment amount of the flow parameter of the flow adjustment component corresponding to the coating, so as to adjust the slurry flow corresponding to the coating, so as to achieve a new adjustment Areal density of each coat applied.

That is to say, the adjustment amount calculation module 107 feeds back the calculated adjustment amount of the flow parameter corresponding to each coating layer to the flow adjustment module 108 . That is, the detection control module 103 , the adjustment amount calculation module 107 and the flow adjustment module 108 form a closed-loop control system, which realizes the online detection and regulation of the areal density of each layer of the multilayer coating.

In some examples, to improve the accuracy of the calculation of the average areal density of each coating layer, for each coating layer, the plurality of areal densities of the coating include areal densities of the coating at a plurality of locations along the first direction and areal densities of the coating at multiple locations along the second direction. For each coating, by considering the areal densities of the coating at different positions in different directions, the accuracy of the calculation of the average areal density of each coating is improved, thereby realizing the calculation of the areal density of each coating. Precise monitoring.

In some specific examples, the first direction is the transverse direction of the width of the multilayer coating, and the second direction is the longitudinal direction (travel direction) of the multilayer coating. That is, the first direction and the second direction are perpendicular. The thickness gauge performs one scan along the width direction of the multi-layer coating, and can obtain the thickness of the multi-layer coating at multiple different positions in the width direction of the multi-layer coating. Similarly, the weight measuring instrument performs one scan along the width direction of the multilayer coating, and the total areal density of the multilayer coating to be measured at multiple different positions along the width direction of the width can be obtained. The detection control module 103 can calculate the areal densities of each coating layer at multiple positions along the transverse direction of the width by using the multiple detection results of the thickness gauge and the multiple detection results of the thickness gauge.

In order to reduce the detection error and improve the accuracy of the calculation of the flow parameter adjustment, the thickness gauge can scan the multi-layer coating in different time periods, and the weight tester can also scan the multi-layer coating in different time periods. , so that the detection control module 103 can obtain the areal densities of each layer of coating at multiple positions in the transverse direction of the width, and obtain the areal densities of each layer of coatings at multiple positions along the longitudinal direction (tape running direction). For each layer of coating, the detection control module 103 takes the average of the calculated areal densities as the average areal density of the coating.

In the embodiment of the present invention, for each layer of coating, the adjustment amount calculation module 107 calculates the adjustment amount of the flow parameter of the flow adjustment component corresponding to the coating based on the average areal density of the coating, so as to adjust the corresponding adjustment amount of the coating. Slurry flow.

As an example, for each layer of coating, if the average areal density of the coating satisfies the preset adjustment condition corresponding to the coating, the adjustment amount calculation module 107 determines the adjustment amount of the flow parameter of the flow adjustment component corresponding to the coating is zero, if the average areal density does not satisfy the preset adjustment condition, the adjustment amount calculation module 107 calculates the adjustment amount based on the preset areal density corresponding to the coating and the average areal density.

In some examples, the preset adjustment condition corresponding to each coating layer may be that the difference between the average areal density corresponding to the coating layer and the preset areal density is within a preset range.

In the embodiment of the present invention, the adjustment amount calculation module 107 and the detection control module 103 may be located in the same upper computer. The flow regulating module 108 may be a programmable logic controller (Programmable Logic Controller, PLC) in the coating machine.

The working process of the adjustment amount calculation module 107 and the flow adjustment module 108 is described below by taking the flow adjustment component as a screw pump as an example. Since the adjustment amount calculation module 107 and the flow adjustment module 108 process any layer of coating in a similar manner, the first layer of coating is used as an example for description below.

FIG. 3 shows a schematic flow chart of the coating areal density detection method. As shown in FIG. 3 , after acquiring multiple areal densities of the first layer of coating from the detection control module 103 , the adjustment amount calculation module 107 averages the multiple areal densities to obtain the average areal density of the first layer of coating.

Referring to FIG. 3 , if the difference between the average areal density of the first layer of coating and the first preset areal density corresponding to the coating is within a preset range, the first screw corresponding to the first layer of coating is not adjusted The pump speed of the pump, that is, the first screw pump can maintain the existing pump speed.

If the difference between the average areal density of the first layer of coating and the first preset areal density exceeds the preset range, then based on the first preset areal density and the average areal density of the coating, calculate the Pump speed adjustment amount to adjust the flow rate of the slurry corresponding to the first layer of coating.

For the first layer of coating, if the average areal density of the first layer of coating is m ₁ , the first preset areal density corresponding to the first layer of coating is m ₁₁ , and the rotational speed of the first screw pump is r revolutions per minute. Then the pump speed adjustment amount Δr (unit is revolutions per minute) of the first screw pump can be expressed by the following expression:

After the detection control module 103 obtains the pump speed adjustment amount Δr of the first screw pump, the pump speed adjustment amount is sent to the flow adjustment module 108 . The flow adjustment module 108 adjusts the pump speed of the first screw pump according to the pump speed adjustment amount Δr, thereby adjusting the flow rate of the slurry corresponding to the first layer of coating.

Referring to FIG. 3 , after receiving the pump speed adjustment amount Δr of the first screw pump, the flow adjustment module 108 determines the adjustment method for the pump speed of the first screw pump according to the size of the pump speed adjustment amount Δr.

Referring to FIG. 3 , if Δr is less than or equal to the preset minimum pump speed r ₁ rpm (revolutions per minute), the flow adjustment module 108 does not adjust the pump speed of the first screw pump, that is, the existing pump speed of the first screw pump remains unchanged .

If Δr is within (r ₁ , 0.8]rpm, the flow adjustment module 108 adjusts the first screw according to the magnitude relationship between the first preset areal density and the average areal density of the first layer of coating, and the pump speed adjustment amount Δr Pump speed of the pump. If m ₁ is less than m ₁₁ , increase the pump speed of the first screw pump by Δr on the basis of the existing pump speed, that is, the surface density of the first layer of coating is light, and the pump speed needs to be increased. If m If ₁ is greater than m ₁₁ , the pump speed of the first screw pump is reduced by Δr on the basis of the existing pump speed, that is, the surface density of the first layer of coating is too large and the pump speed needs to be reduced.

In the embodiment of the present invention, the flow adjustment module 108 further includes a sub-section adjustment sub-module, for each coating, if the adjustment amount of the coating is within the preset flow parameter range, the flow rate corresponding to the coating is based on the coating. The adjustment amount of the flow parameter of the adjustment component adjusts the flow parameter in stages.

As an example, the preset flow parameter interval corresponding to the first layer coating is (0.8, 1.5] rpm. The first endpoint of the preset flow parameter interval is 0.8 revolutions per second, and the second endpoint of the preset flow parameter interval is 1.5 revolutions per second.

If Δr is within (0.8, 1.5] rpm, in order to maintain the stability of the coating coating, the sub-module will adjust the pump speed of the first screw pump in stages according to Δr. As an example, if m ₁ is less than m ₁₁ , then the sub-module of the sub-section adjustment increases the pump speed of the first screw pump by 1/2Δr for the first time. Then, the sub-module of sub-section adjustment increases the pump speed of the first screw pump by 1/2Δr again, so as to realize the sub-section adjustment of the first screw pump. The pump speed of a screw pump is increased by Δr. In other examples, the sub-module for segment adjustment can also adjust the pump speed of the first screw pump three or more times, so as to increase the pump speed of the first screw pump Δr.

If Δr is greater than 1.5, the flow adjustment module 108 sends a warning message to remind manual adjustment or directly control the first screw pump to stop.

It should be noted that each layer of coating has a corresponding screw pump, and the flow adjustment module 108 adjusts the flow parameters of the flow adjustment components of other coatings in a manner similar to that of the first layer of coating. Repeat.

In some examples, the flow adjustment module 108 may also implement closed-loop control of the areal density of each coating layer by controlling the opening of the return valve corresponding to each coating layer.

Similar to adjusting the pump speed of the screw pump, for any layer of coating, if the average areal density of the coating is greater than the preset areal density corresponding to the coating, the flow adjustment module 108 increases the return flow corresponding to the coating. The opening of the valve to reduce the flow rate of the slurry corresponding to the coating.

If the average areal density of the coating is less than the corresponding preset areal density, the flow adjustment module 108 reduces the opening of the return valve corresponding to the coating to increase the flow rate of the slurry corresponding to the coating.

In the embodiment of the present invention, by monitoring the areal density of each layer online, and feeding back the detected areal density of each layer to the corresponding screw pump/return valve for closed-loop pump speed/flow, the product can be improved. Consistency, stability and production efficiency, reduce defective rate.

Based on the above process, the coating surface density detection method provided by the embodiment of the present invention can be summarized into the steps shown in FIG. 4 . As shown in Figure 4, the coating surface density detection method provided by the embodiment of the present invention comprises the following steps:

S410, obtain the total thickness of the multi-layer coating to be tested and the total areal density of the multi-layer coating to be tested.

S420, calculating the areal density of each layer of the multi-layer coating to be tested based on the total thickness and the total areal density.

In the embodiment of the present invention, step S420 includes the following steps:

The areal density of each coating is calculated based on the total thickness, the total areal density, and the pre-obtained bulk density of each coating.

In some embodiments of the present invention, if the multi-layer coating to be tested includes two layers, the following expression (3) can be used to calculate the areal density m ₁ of the first layer of the two layers, and The areal density m ₂ of the second coating of the two coatings can be calculated using expression (4).

For the embodiments of the coating areal density detection method, reference may be made to the description part of the coating areal density detection device, which will not be repeated here.

The coating areal density detection method provided by the embodiment of the present invention realizes the online accurate detection of the areal density of each coating layer, and can form a closed-loop control for the areal density of each coating layer, and accurately adjust the surface density of each coating layer. Density improves product consistency, stability and production efficiency.

It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment may be referred to each other, and each embodiment focuses on the differences from other embodiments. place. For the embodiments of the coating areal density detection method, reference may be made to the description of the coating areal density detection device. The invention is not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions, or change the order between steps, after appreciating the spirit of the present invention. Also, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

Those skilled in the art should understand that the above-mentioned embodiments are all illustrative and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Those skilled in the art should be able to understand and implement other variant embodiments of the disclosed embodiments on the basis of studying the drawings, the description and the claims. Any reference signs in the claims shall not be construed as limiting the scope. The functions of several parts presented in the claims can be implemented by a single hardware or software module. The mere presence of certain technical features in different dependent claims does not imply that these features cannot be combined to advantage.

Claims (10)

1. A coated surface density detection apparatus, comprising:

the thickness detection module is used for detecting the total thickness of the multilayer coating to be detected;

the surface density detection module is used for detecting the total surface density of the multilayer coating to be detected;

the detection control module is used for calculating the surface density of each layer of coating in the multilayer coating to be detected based on the total thickness and the total surface density;

the detection control module is used for calculating the surface density of each coating layer based on the total thickness, the total surface density and the pre-acquired volume density of each coating layer;

If the to-be-detected multilayer coating comprises two layers of coatings; wherein,

the detection control module is used for calculating the surface density m of the first coating layer in the two coating layers based on the following expression ₁ ：

m ₁ ＝(h-m/ρ ₂ )×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ )

The detection control module is used for calculating the surface density m of the second coating layer in the two coating layers based on the following expression ₂ ：

m ₂ ＝(m/ρ ₁ -h)×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ )

Wherein h is the total thickness, m is the total areal density, ρ ₁ Is the bulk density, p, of the first coating ₂ Is the bulk density of the second coating.

2. The apparatus of claim 1, further comprising an adjustment amount calculation module configured to calculate, for each coating, an average areal density of the coating based on the plurality of areal densities of the coating, and an adjustment amount of the flow parameter of the flow adjustment assembly corresponding to the coating based on the average areal density of the coating to adjust the slurry flow rate corresponding to the coating.

3. The apparatus according to claim 2, wherein the adjustment amount calculating module is specifically configured to, for each coating, if the average areal density of the coating satisfies a preset adjustment condition corresponding to the coating, the adjustment amount of the flow parameter of the flow adjusting assembly corresponding to the coating is zero, and if the average areal density does not satisfy the preset adjustment condition, the adjustment amount is calculated based on the preset areal density corresponding to the coating and the average areal density.

4. The apparatus of claim 2, further comprising a flow adjustment module configured to adjust, for each coating, the flow parameter based on the adjustment amount of the flow parameter of the flow adjustment assembly corresponding to the coating to adjust the slurry flow rate corresponding to the coating.

5. The apparatus of claim 4, wherein the flow regulation module comprises:

and the segmented adjusting submodule is used for adjusting the flow parameter in a segmented manner based on the adjustment quantity of the flow parameter of the flow adjusting component corresponding to the coating if the adjustment quantity of the coating is within a preset flow parameter interval for each layer of coating.

6. The apparatus of claim 5, wherein if the flow regulating element is a screw pump, the flow parameter is a pump speed of the screw pump, the first end of the predetermined flow parameter interval is 0.8 revolutions per second, and the second end of the predetermined flow parameter interval is 1.5 revolutions per second.

7. The apparatus of claim 2, wherein the flow regulating assembly is a screw pump or a return valve; wherein,

if the flow regulating component is the screw pump, the flow parameter is the pump speed of the screw pump;

And if the flow regulating assembly is the reflux valve, the flow parameter is the opening degree of the reflux valve.

8. The apparatus of claim 2, wherein for each coating, the plurality of areal densities of the coating comprises an areal density at a plurality of locations of the coating in the first direction and an areal density at a plurality of locations of the coating in the second direction.

9. The apparatus of claim 8, wherein the first direction is perpendicular to the second direction.

10. A method for detecting areal density of a coating, the method comprising:

acquiring the total thickness of the multilayer coating to be detected and the total areal density of the multilayer coating to be detected;

calculating the surface density of each coating layer in the multilayer coating to be tested based on the total thickness and the total surface density;

calculating the surface density of each coating layer in the multi-layer coating to be tested based on the total thickness and the total surface density, wherein the calculating comprises the following steps:

calculating the areal density of each layer of coating based on the total thickness, the total areal density and a pre-obtained bulk density of each layer of coating;

if the multilayer coating to be detected comprises two layers of coatings; wherein,

calculating the areal density m of the first of the two coatings using the following expression ₁ ：

m ₁ ＝(h-m/ρ ₂ )×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ )

Calculating the areal density m of the second of the two coatings using the following expression ₂ ：

m ₂ ＝(m/ρ ₁ -h)×ρ ₁ ρ ₂ /(ρ ₂ -ρ ₁ )

Wherein h is the total thickness, m is the total areal density, ρ ₁ Is the bulk density, p, of the first coating ₂ Is the bulk density of the second coating.

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