A gradual color spraying preparation method of artificial leather products for vehicles

Abstract

The application provides a gradual color spraying preparation method of a vehicle artificial leather product, adopts a multi-roll spraying device to spray the artificial leather with gradual colors, and comprises the following steps: blending a first main color pigment, a second main color pigment and paint into multiple finishing agents with different proportions, and injecting the finishing agents into corresponding nozzle components; making the artificial leather pass through a tension roller, a fixing roller and a guide roller in sequence, and fixing the opening end on a driving roller; driving the driving roller to rotate through a driving assembly, making the artificial leather move from a feeding roller to the driving roller, and making the surface of the part of the artificial leather below the spraying assembly on the surface of the fixing roller adhere to the atomized finishing agent sprayed by the nozzle component; and changing the position of the tension roller relative to the rack by changing the angle of the swing rod relative to the rack through a cylinder to reduce the tension fluctuation of the artificial leather between the feeding roller and the driving roller during the movement of the artificial leather from the feeding roller to the driving roller.

Description

TECHNICAL FIELD

[0001] The present application relates to a spraying method, in particular to a gradual color spraying preparation method of artificial leather products for vehicles, and belongs to the technical field of automobile parts manufacturing. BACKGROUND

[0002] Artificial leather products are widely used in clothing, shoe materials, furniture, automotive interiors and other fields. In particular, the gradual color artificial leather product is especially suitable for manufacturing automotive interiors and covering the steering wheel of the vehicle due to the formation of the color transition and the beautiful effect of the gradual change on the surface of the artificial leather material. The existing artificial leather gradual color spraying technology has some problems, mainly in the uniformity and efficiency of spraying. In the prior art, although the planar feeding spraying method can maintain the flatness of the artificial leather surface during the spraying process, it needs to set up a separate leather clamping device, which affects the production efficiency and is not conducive to large-scale batch production. The multi-roll feeding often adopts the roll coating method, which needs a complex color transfer roller to realize the gradual color roll coating, and it is difficult to control the uniformity of the gradual color roll coating. Therefore, the multi-roll feeding combined with the spraying method is more suitable for the batch production of the gradual color artificial leather product, but there is still a lack of related research on the gradual color spraying preparation method of the artificial leather product for vehicles in the prior art. SUMMARY

[0003] Based on the above background, the purpose of the present application is to provide a gradual color spraying preparation method of artificial leather products for vehicles, which ensures the flatness of the artificial leather during the spraying process and improves the spraying uniformity of the gradual color transition area of the artificial leather.

[0004] In order to achieve the above-mentioned purpose of the application, the present application provides the following technical solutions:

[0005] A method for preparing gradient color coating on automotive artificial leather products involves using a multi-roller spraying device to spray gradient colors onto the artificial leather. The multi-roller spraying device includes a frame, a housing, a spraying assembly, a drive assembly, a drive roller, a guide roller, a fixed roller, a tension roller, a tension adjusting assembly, a measuring roller, a force sensor, and a feeding roller. The housing is located on top of the frame, and the space between the housing and the frame is configured as a spraying space. The drive roller, guide roller, fixed roller, tension roller, measuring roller, and feeding roller are sequentially arranged within the spraying space. The spraying assembly is located above the fixed roller and has multiple nozzle components arranged in a straight line. A drive assembly connects to a drive roller parallel to the central axis of a fixed roller. The ends of the drive roller, guide roller, fixed roller, and feed roller are respectively connected to the frame. The end of a tension roller is connected to the frame via a tension adjustment assembly, and the end of a measuring roller is connected to the frame via a force sensor. The tension adjustment assembly includes a cylinder and a rocker arm. One end of the rocker arm is hinged to the end of the tension roller, and the other end is hinged to the frame. The cylinder has a fixed end and a moving end; the fixed end of the cylinder is hinged to the frame, and the moving end of the cylinder is hinged to the portion between the two ends of the rocker arm. The method for preparing gradient color spray coating for automotive artificial leather products includes the following steps:

[0006] The first primary color pigment, the second primary color pigment, and the coating are mixed in different proportions to form multiple parts of coating agent. The number of parts of the coating agent is equal to the number of nozzle components. Each part of coating agent corresponds to one nozzle component. Along the arrangement direction of the nozzle components, the percentage of saturation and transparency of the first primary color of the coating agent corresponding to different nozzle components decreases from one hundred to zero, and the percentage of saturation and transparency of the second primary color of the coating agent corresponding to different nozzle components increases from zero to one hundred, and the coating agent is injected into the corresponding nozzle component.

[0007] The open end of the artificial leather roll placed on the feeding roller is pulled out, and the artificial leather passes through the tension roller, the fixed roller and the guide roller in sequence, and the open end is fixed on the drive roller.

[0008] The drive assembly drives the drive roller to rotate, causing the artificial leather to move from the feeding roller toward the drive roller, so that the part of the artificial leather surface that is on the surface of the fixed roller and located below the spraying assembly is adhered by the atomized coating agent sprayed by the nozzle component.

[0009] As the artificial leather moves from the feed roller to the drive roller, the position of the tension roller relative to the frame is changed by altering the angle of the swing arm relative to the frame through a cylinder, thereby reducing the tension fluctuation of the artificial leather between the feed roller and the drive roller.

[0010] Preferably, changing the position of the tension roller relative to the frame by changing the angle of the swing arm relative to the frame using a cylinder includes the following steps:

[0011] A preset target tension value is set, the pressure of the measuring roller pair on the frame is continuously obtained by the force sensor, and the real-time tension value of the artificial leather between the feeding roller and the driving roller is calculated and obtained. The real-time tension value is continuously compared with the target tension value;

[0012] If the real-time tension value is greater than the target tension value, the gas cylinder is controlled to act, the swing rod is swung upward, the position of the tension roller relative to the frame is moved upward, and the real-time tension value is equal to the target tension value.

[0013] If the real-time tension value is less than the target tension value, the gas cylinder is controlled to act, the swing rod is swung downward, the position of the tension roller relative to the frame is moved downward, and the real-time tension value is equal to the target tension value.

[0014] As preferred, the control method of the gas cylinder action comprises the following steps:

[0015] According to the difference between the real-time tension value and the target tension value, the swing rod swing angle value is calculated, and then according to the swing rod swing angle value, the displacement amount of the moving end of the gas cylinder relative to the fixed end of the gas cylinder is calculated, and the moving end of the gas cylinder is controlled to move the displacement amount.

[0016] As preferred, the swing rod swing angle value is calculated by the following mathematical expression,

[0017]

[0018] In the formula, θ represents the swing angle value of the swing rod, T represents the real-time tension value of the artificial leather, T0 represents the target tension value of the artificial leather, F represents the friction force between the tension roller and the artificial leather, k represents the elastic constant of the artificial leather, and c represents the proportional constant for describing the proportional relationship between the length change of the artificial leather between the measuring roller and the fixed roller caused by the change of the position of the tension roller and the swing angle value of the swing rod.

[0019] As preferred, the gas cylinder is arranged below the swing rod, and the part where the gas cylinder is hinged to the frame is lower than the part where the swing rod is hinged to the frame.

[0020] As preferred, the gradual color spraying preparation method of the artificial leather product for vehicles further comprises the following steps:

[0021] A preset target tension value is set, and the distance from the nozzle part to the surface of the artificial leather on the surface of the fixed roller, the spraying pressure, and the flow rate of the finishing agent injected into the nozzle part are adjusted according to the target tension value.

[0022] As preferred, the multi-roller spraying device further comprises a drying assembly arranged in the spraying space and located between the guide roller and the fixed roller; and the gradual color spraying preparation method of the artificial leather product for vehicles further comprises the following steps:

[0023] During the movement of the artificial leather from the feed roller to the driving roller, the part of the artificial leather with the surface attached by the atomized finishing agent passes below the drying assembly, and the finishing agent on the surface of the artificial leather is dried by the drying assembly.

[0024] As a preference, the drying assembly further comprises a height adjusting component, and the gradual color spraying preparation method of the artificial leather product for vehicles further comprises the following steps:

[0025] According to the speed of the movement of the artificial leather from the feed roller to the driving roller, the distance of the drying assembly to the surface of the artificial leather is adjusted.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] The gradual color spraying preparation method of the artificial leather product for vehicles of the present application ensures the flatness of the artificial leather during the spraying process by precisely controlling the tension of the artificial leather between the feed roller and the driving roller, improves the spraying uniformity of the gradual color transition area of the artificial leather, reduces the spraying defects such as stripes and color difference caused by the expansion and contraction of the artificial leather material, and better adapts to the spraying needs of different artificial leather materials. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0029] Figure 1 is a structural schematic diagram of the multi-roll spraying device in the present application;

[0030] In the figure: 1, frame; 2, cover; 3, spraying assembly; 4, nozzle component; 5, driving roller; 6, guide roller; 7, fixed roller; 8, tension roller; 9, air cylinder; 10, swing lever; 11, measuring roller; 12, force sensor; 13, feed roller; 14, drying assembly; 15, height adjusting component. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be further specifically described below by specific embodiments in combination with the drawings. It should be understood that the implementation of the present application is not limited to the following embodiments, and any form of modification and / or change of the present application will fall within the scope of protection of the present application.

[0032] In the present application, all the parts and percentages are by weight, the equipment and raw materials used are commercially available or commonly used in the art. The methods in the following examples are conventional methods in the art unless otherwise specified. The components or equipment in the following examples are general standard components or components known to those skilled in the art, and their structure and principle can be known to those skilled in the art through technical manuals or through conventional experimental methods.

[0033] The embodiment of the present application discloses a gradual color spraying preparation method of artificial leather products for vehicles, which sprays the artificial leather with gradual color by using a multi-roll spraying device. Figure 1 As shown in the figure, the multi-roll spraying device comprises a rack 1, a cover 2, a spraying assembly 3, a driving assembly, a driving roll 5, a guide roll 6, a fixed roll 7, a tension roll 8, a tension adjusting assembly, a measuring roll 11, a force sensor 12 and a discharge roll 13. The cover 2 is arranged on the top of the rack 1, the space between the cover 2 and the rack 1 is configured as a spraying space, the driving roll 5, the guide roll 6, the fixed roll 7, the tension roll 8, the measuring roll 11 and the discharge roll 13 are sequentially arranged in the spraying space, the spraying assembly 3 is arranged above the fixed roll 7, the spraying assembly 3 has a plurality of nozzle components 4 arranged in a straight line, the arrangement direction of the nozzle components 4 is parallel to the central axis of the fixed roll 7, the driving assembly is connected to the driving roll 5, the end of the driving roll 5, the end of the guide roll 6, the end of the fixed roll 7 and the end of the discharge roll 13 are respectively connected to the rack 1, the end of the tension roll 8 is connected to the rack 1 through the tension adjusting assembly, and the end of the measuring roll 11 is connected to the rack 1 through the force sensor 12. The tension adjusting assembly comprises a gas cylinder 9 and a swing rod 10, one end of the swing rod 10 is hinged to the end of the tension roll 8, and the other end of the swing rod 10 is hinged to the rack 1. The gas cylinder 9 has a fixed end and a moving end, the fixed end of the gas cylinder 9 is hinged to the rack 1, and the moving end of the gas cylinder 9 is hinged to the part between the two ends of the swing rod 10. The gas cylinder 9 is arranged below the swing rod 10, and the part where the gas cylinder 9 is hinged to the rack 1 is lower than the part where the swing rod 10 is hinged to the rack 1.

[0034] The gradual color spraying preparation method of the artificial leather products for vehicles comprises the following steps:

[0035] The first main color pigment, the second main color pigment and the paint are mixed in different proportions to form a plurality of finishing agents, the number of the finishing agents is equal to the number of the nozzle components 4, each finishing agent corresponds to one nozzle component 4, along the arrangement direction of the nozzle components 4, the first main color saturation and the transparency percentage of the finishing agents corresponding to different nozzle components 4 decrease by equal difference from one hundred to zero, and the second main color saturation and the transparency percentage of the finishing agents corresponding to different nozzle components 4 increase by equal difference from zero to one hundred, and the finishing agents are injected into the corresponding nozzle components 4;

[0036] The opening end of the artificial leather roll on the feed roller 13 is pulled out, and the artificial leather is sequentially passed through the tension roller 8, the fixed roller 7 and the guide roller 6, and the opening end is fixed on the driving roller 5;

[0037] The driving roller 5 is driven to rotate by the driving assembly, so that the artificial leather moves from the feed roller 13 to the driving roller 5, and the surface of the artificial leather under the nozzle part 4 is attached to the surface of the fixed roller 7.

[0038] During the movement of the artificial leather from the feed roller 13 to the driving roller 5, the position of the tension roller 8 relative to the rack 1 is changed by changing the angle of the swing rod 10 relative to the rack 1 by the cylinder 9, so as to reduce the tension fluctuation of the artificial leather between the feed roller 13 and the driving roller 5.

[0039] The tension adjusting assembly composed of the cylinder 9 and the swing rod 10 controls the tension of the artificial leather. In order to realize more intelligent and accurate process control, an external PLC automatic control system can be matched to adjust the tension of the artificial leather in a PID control mode. By accurately controlling the tension of the artificial leather between the feed roller 13 and the driving roller 5, the flatness of the artificial leather during spraying is ensured, the spraying uniformity of the gradual color transition area of the artificial leather is improved, the spraying defects such as stripes and color difference caused by the expansion and contraction of the artificial leather material are reduced, and the spraying needs of different artificial leather materials can be better adapted.

[0040] Specifically, the step of changing the position of the tension roller 8 relative to the rack 1 by changing the angle of the swing rod 10 relative to the rack 1 by the cylinder 9 includes the following steps:

[0041] A target tension value is preset, the downward pressure of the measuring roller 11 on the rack 1 is continuously obtained by the force sensor 12, the real-time tension value of the artificial leather between the feed roller 13 and the driving roller 5 is calculated, and the real-time tension value is continuously compared with the target tension value;

[0042] If the real-time tension value is greater than the target tension value, the swing rod 10 is swung upward, the position of the tension roller 8 relative to the rack 1 is moved upward, and the real-time tension value is equal to the target tension value until the real-time tension value is equal to the target tension value.

[0043] If the real-time tension value is less than the target tension value, the swing rod 10 is swung downward, the position of the tension roller 8 relative to the rack 1 is moved downward, and the real-time tension value is equal to the target tension value until the real-time tension value is equal to the target tension value.

[0044] Specifically, the control method of the cylinder 9 includes the following steps:

[0045] According to the difference between the real-time tension value and the target tension value, the swing angle value of the swing rod 10 is calculated, and according to the swing angle value of the swing rod 10, the displacement amount of the moving end of the cylinder 9 relative to the fixed end of the cylinder 9 is calculated, and the moving end of the cylinder 9 is controlled to move the displacement amount.

[0046] Specifically, the swing angle value of the swing rod 10 is calculated by the following mathematical expression,

[0047]

[0048] In the formula, θ represents the swing angle value of the swing rod 10, T represents the real-time tension value of the artificial leather, T0 represents the target tension value of the artificial leather, F represents the friction force between the tension roller 8 and the artificial leather, k represents the elastic constant of the artificial leather, and c represents the proportional constant for describing the proportional relationship between the change in the length of the artificial leather between the measuring roller 11 and the fixed roller 7 caused by the change in the position of the tension roller 8 and the swing angle value of the swing rod 10.

[0049] In the embodiment, the gradual color spraying preparation method of the artificial leather product for vehicles further includes the following steps: presetting the target tension value, and adjusting the distance from the nozzle component 4 to the surface of the artificial leather on the surface of the fixed roller 7, the spraying pressure, and the flow rate of the finishing agent injected into the nozzle component 4 according to the target tension value.

[0050] In the embodiment, in order to accelerate the evaporation of the solvent in the finishing agent on the surface of the artificial leather and the curing process of the gradual color coating, and make the gradual color coating harden and tightly adhere to the surface of the leather, the multi-roller spraying device further includes a drying assembly 14, which is arranged in the spraying space and located between the guide roller 6 and the fixed roller 7. The gradual color spraying preparation method of the artificial leather product for vehicles further includes the following steps: during the movement of the artificial leather from the feed roller 13 to the driving roller 5, the part of the artificial leather with the surface attached by the atomized finishing agent passes below the drying assembly 14, and the drying assembly 14 is used to dry the finishing agent on the surface of the artificial leather.

[0051] Specifically, in order to control the heat transfer in the drying process, the drying assembly 14 further includes a height adjusting component 15. The gradual color spraying preparation method of the artificial leather product for vehicles further includes the following steps: adjusting the distance from the drying assembly 14 to the surface of the artificial leather according to the movement speed of the artificial leather from the feed roller 13 to the driving roller 5.

[0052] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present application. However, one or more embodiments can also be practiced without these specific details.

[0053] The principles and implementations of the present application are described in the specific examples in this article, and the above examples are only used to help understand the method of the present application and its core idea. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A method for preparing gradient color spraying of automotive artificial leather products, comprising using a multi-roller spraying device to perform gradient color spraying on artificial leather, characterized in that: The multi-roll spraying device comprises a rack (1), a cover (2), a spraying assembly (3), a driving assembly, a driving roller (5), a guide roller (6), a fixed roller (7), a tension roller (8), a tension adjusting assembly, a measuring roller (11), a force sensor (12) and a feeding roller (13), the cover (2) is arranged on the top of the rack (1), the space between the cover (2) and the rack (1) is configured as a spraying space, the driving roller (5), the guide roller (6), the fixed roller (7), the tension roller (8), the measuring roller (11) and the feeding roller (13) are sequentially arranged in the spraying space, the spraying assembly (3) is arranged above the fixed roller (7), the spraying assembly (3) has a plurality of nozzle components (4) arranged in a straight line, the arrangement direction of the nozzle components (4) is parallel to the central axis of the fixed roller (7), the driving assembly is connected to the driving roller (5), the ends of the driving roller (5), the guide roller (6), the fixed roller (7) and the feeding roller (13) are respectively connected to the rack (1), the end of the tension roller (8) is connected to the rack (1) through the tension adjusting assembly, and the end of the measuring roller (11) is connected to the rack (1) through the force sensor (12); the tension adjusting assembly comprises a cylinder (9) and a swing rod (10), one end of the swing rod (10) is hinged to the end of the tension roller (8), the other end of the swing rod (10) is hinged to the rack (1), the cylinder (9) has a fixed end and a moving end, the fixed end of the cylinder (9) is hinged to the rack (1), and the moving end of the cylinder (9) is hinged to the part between the two ends of the swing rod (10); the gradual color spraying preparation method of the automotive artificial leather product comprises the following steps: A plurality of finishing agents are prepared by blending a first primary color pigment, a second primary color pigment and paint in different proportions, the number of the finishing agents is equal to the number of the nozzle components (4), each finishing agent corresponds to a nozzle component (4), the first primary color saturation and the transparency percentage of the finishing agent corresponding to different nozzle components (4) decrease by equal differences from one hundred to zero along the arrangement direction of the nozzle components (4), and the second primary color saturation and the transparency percentage of the finishing agent corresponding to different nozzle components (4) increase by equal differences from zero to one hundred, and the finishing agent is injected into the corresponding nozzle component (4); The opening end of the artificial leather roll placed on the feeding roller (13) is pulled out, so that the artificial leather sequentially passes through the tension roller (8), the fixed roller (7) and the guide roller (6), and the opening end is fixed on the driving roller (5); A target tension value is preset, and the distance between the nozzle component (4) and the surface of the artificial leather on the surface of the fixed roller (7), the spraying pressure and the flow rate of the finishing agent injected into the nozzle component (4) are adjusted according to the target tension value; The driving roller (5) is driven to rotate by the driving assembly, so that the artificial leather moves from the feeding roller (13) to the driving roller (5), and the part of the artificial leather surface on the surface of the fixed roller (7) and below the spraying assembly (3) is attached by the atomized finishing agent sprayed by the nozzle component (4); During the movement of the artificial leather from the unwinding roller (13) to the driving roller (5), the tension fluctuation of the artificial leather between the unwinding roller (13) and the driving roller (5) is reduced by changing the position of the tension roller (8) relative to the rack (1) through the change of the angle of the swing lever (10) relative to the rack (1) by the air cylinder (9). The method for changing the position of the tension roller (8) relative to the rack (1) by changing the angle of the swing lever (10) relative to the rack (1) through the air cylinder (9) comprises the following steps: The downward pressure of the measuring roller (11) on the rack (1) is continuously obtained by the force sensor (12), and the real-time tension value of the artificial leather between the unwinding roller (13) and the driving roller (5) is calculated, and the real-time tension value and the target tension value are continuously compared; If the real-time tension value is greater than the target tension value, the air cylinder (9) is controlled to act, the swing lever (10) swings upward, the position of the tension roller (8) relative to the rack (1) moves upward, and the real-time tension value is equal to the target tension value. If the real-time tension value is less than the target tension value, the air cylinder (9) is controlled to act, the swing lever (10) swings downward, the position of the tension roller (8) relative to the rack (1) moves downward, and the real-time tension value is equal to the target tension value.

2. The method for preparing a gradient color spray coating of an artificial leather product for vehicles according to claim 1, characterized in that: The control method of the air cylinder (9) comprises the following steps: According to the difference between the real-time tension value and the target tension value, the swing angle value of the swing lever (10) is calculated, and according to the swing angle value of the swing lever (10), the displacement amount of the moving end of the air cylinder (9) relative to the fixed end of the air cylinder (9) is calculated, and the moving end of the air cylinder (9) is controlled to move the displacement amount.

3. The method according to claim 2, wherein the method is characterized by: The swing angle value of the swing lever (10) is calculated by the following mathematical expression, ， In the formula, θ represents the swing angle value of the swing lever (10), T represents the real-time tension value of the artificial leather, T0 represents the target tension value of the artificial leather, F represents the friction force between the tension roller (8) and the artificial leather, k represents the elastic constant of the artificial leather, and c represents the proportional constant for describing the proportional relationship between the length change of the artificial leather between the measuring roller (11) and the fixed roller (7) caused by the change of the position of the tension roller (8) and the swing angle value of the swing lever (10).

4. The method for preparing a gradual color spray coating of an artificial leather product for vehicles according to claim 2, characterized in that: The air cylinder (9) is arranged below the swing lever (10), and the part where the air cylinder (9) is hinged to the rack (1) is lower than the part where the swing lever (10) is hinged to the rack (1).

5. The method for preparing a gradual color spray coating of an artificial leather product for vehicles according to claim 1, characterized in that: The multi-roller spraying device further comprises a drying assembly (14) arranged in the spraying space and located between the guide roller (6) and the fixed roller (7); and the gradual color spraying preparation method of the artificial leather product for vehicles further comprises the following steps: During the movement of the artificial leather from the unwinding roller (13) to the driving roller (5), the part of the artificial leather with the atomized finishing agent attached to the surface passes below the drying assembly (14), and the finishing agent on the surface of the artificial leather is dried by the drying assembly (14).

6. The method for gradually changing color spraying of an artificial leather product for vehicles according to claim 5, characterized in that: The drying assembly (14) further comprises a height adjusting component (15), and the gradual color spraying preparation method of the artificial leather product for vehicles further comprises the following steps: According to the speed of the movement of the artificial leather from the unwinding roller (13) to the driving roller (5), the distance from the drying assembly (14) to the surface of the artificial leather is adjusted.

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