Water-based adhesive applying method for automotive trim industry

Abstract

The invention relates to a water-based adhesive applying method for the automotive trim industry. Comprising the following steps: step 1, preparation work; 2, debugging equipment; 3, determining water-based glue according to customer requirements, and placing the water-based glue in a glue tank room; fourthly, sizing is conducted on the fabric needing to be bonded in the automotive trim industry through a sizing device; and step 5, drying the glued fabric and then stripping. The water-based glue applying method for the automotive trim industry is realized through a glue applying device, and the glue applying device comprises a glue rolling machine head, an automatic glue supply system and a material conveying system, the automatic glue supply system conveys water-based glue to the glue rolling machine head, fabric needing to be bonded is conveyed through the material conveying system, and finally glue is applied through the glue rolling machine head. According to the invention, industrial application of water-based glue roller coating is realized initiatively, and three technical problems of cross-linking denaturation, bubble generation and equipment corrosion of water-based glue in roller coating are solved through inert environment control and special roller design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of process production flow in the automotive interior industry, in particular to a water-based adhesive application method for the automotive interior industry. BACKGROUND

[0002] With the continuous upgrading of the automotive interior industry, the application of coating technology is becoming more and more widespread, and the demand for environmentally friendly coating of complex components such as instrument panels, door panels, and pillars is growing rapidly. The amount of glue used has increased significantly. According to statistics from the Automotive Interior Industry Association in 2023, the amount of glue used per vehicle has increased by 37% over the past five years.

[0003] Water-based glue is favored by major OEMs due to its environmental performance (VOC emissions are only 1 / 10 of solvent-based glue) and stability (compatibility with PVC, TPU, and other commonly used interior materials is over 92%).

[0004] However, the current water-based glue application method in the industry mainly uses a glue spraying circulation system, which has the problem of low glue utilization rate, generally between 45-65%. This is mainly due to scattering during glue spraying and glue residue in the pipeline circulation system.

[0005] For example, patent CN107497582A proposes a water-based glue spraying device for automotive interiors, which has the advantage of low equipment cost, but has the problems of low glue utilization rate (40-60%), poor uniformity of curved surface spraying, high energy consumption, and frequent maintenance. Especially for porous substrates such as hemp fiber boards used in new energy vehicles, traditional spray guns can easily cause excessive penetration of glue (penetration depth exceeding 1.2mm) due to high atomization pressure, affecting the appearance flatness.

[0006] In addition, patent CN102275200A discloses a manufacturing method for bamboo fiber composite profiles, which can produce composite profiles with stable dimensions and high mechanical strength, but the glue application method still has the problems of uneven distribution and uneven glue distribution on the board.

[0007] Therefore, the existing water-based glue application method has the problems of low glue utilization rate, uneven glue application, complex equipment, and high maintenance workload, and a new water-based glue application method is needed to solve the above technical problems.

[0008] The present application proposes a water-based glue application method using a roller coating method to solve the above problems in the existing water-based glue application method. SUMMARY

[0009] The technical problem to be solved by the present application is to provide a water-based glue application process for the automotive interior industry, which can reduce energy consumption, save manpower and resources, and produce efficiently, and also reduce environmental pollution.

[0010] The present invention is described as follows in conjunction with the accompanying drawings:

[0011] The present invention provides a method for applying water-based glue for the automotive interior decoration industry, comprising the following steps:

[0012] Step 1: Preparation;

[0013] Step 2: Debug the equipment;

[0014] Step 3: Determine the water-based glue according to customer needs and place it in the glue tank room;

[0015] Step 4: Apply glue to the fabrics that need to be bonded in the automotive interior industry through the glue applying device;

[0016] Step 5: Dry and peel off the sizing fabric.

[0017] Furthermore, the specific method of step one is as follows:

[0018] 11) Confirm process parameters according to product process;

[0019] 12) Confirm that environmental conditions meet production requirements;

[0020] 13) Confirm that the equipment is operating normally.

[0021] Furthermore, the environmental conditions in step 12) meet the production requirements specifically as follows:

[0022] Temperature 0-5℃, humidity 30-60%, no fog or dew, no direct sunlight.

[0023] Furthermore, the specific method of step 2 is as follows:

[0024] 21) Set the machine speed according to the product process;

[0025] 22) Adjust the roller pressure according to the product process;

[0026] 23) Adjust the heating temperature according to the product process.

[0027] Furthermore, in step 21), the machine operating speed is 0-5 m / min; in step 22), the roller pressure is 200 N-500 N; and in step 23), the heating temperature is 50-70° C.

[0028] Furthermore, the gluing device includes a roller glue head, an automatic glue supply system and a material conveying system; the automatic glue supply system conveys water-based glue to the roller glue head, the fabric to be bonded is conveyed through the material conveying system, and finally the roller glue head applies glue.

[0029] Furthermore, the automatic glue supply system includes a glue tank room, a glue delivery pipeline, a solenoid valve and a PLC; the glue tank room includes a pressure tank and an electronic scale; the pressure tank is placed on the electronic scale; the pressure tank is connected to the glue delivery pipeline; a solenoid valve is provided on the glue delivery pipeline; and the solenoid valve is controlled by the PLC.

[0030] Furthermore, the product conveying system includes a high-precision anti-sticking belt, a servo drive motor and a guide roller; the servo drive motor is connected to the guide roller and controlled by PLC; the guide roller is provided with a high-precision anti-sticking belt.

[0031] Furthermore, the glue roller head includes a wall panel, a coating roller, a metering roller, a glue tank, a glue supply system level detection and glue outlet pipe, a main rubber stop plate, an auxiliary rubber stop plate, a roller gap adjustment device and a glue amount adjustment system; the glue roller head can move up and down as a whole, and control the gap size between the coating roller and the high-precision anti-sticking belt; an angle is formed between the coating roller and the metering roller to hold the water-based glue; auxiliary rubber stop plates are added on both sides of the water-based glue to form a glue tank; main rubber stop plates are provided on both sides of the auxiliary rubber stop plate; the lower ends of the main rubber stop plate and the auxiliary rubber stop plate are fixed to the coating roller and the metering roller On the roller shaft of the measuring roller; wall panels are provided at both ends of the roller shafts of the coating roller and the metering roller; the liquid level detection and glue outlet pipe of the glue supply system are connected to the glue delivery pipe; the glue application amount adjustment system is controlled by PLC; the gap between the metering roller and the coating roller is adjusted by a roller gap adjustment device; the roller gap adjustment device includes a gap adjustment servo motor, a roller mold clamping cylinder, an adjustment block and a wedge block; the roller mold clamping cylinder clamps the rollers of the coating roller and the metering roller; the gap adjustment servo motor adjusts the distance between the rollers through the distance between the wedge block and the adjustment block.

[0032] Furthermore, the gluing device also includes a touch screen and a drying device; the touch screen is connected to the PLC; the fabric after gluing can be dried by the drying device; the drying device includes a roller glue machine conveyor belt, a drying tunnel conveyor belt and an auxiliary scraper; the fabric is conveyed to the drying tunnel conveyor belt by the roller glue machine conveyor belt for drying; the auxiliary scraper is arranged between the roller glue machine conveyor belt and the drying tunnel conveyor belt to scrape off excess water-based glue.

[0033] The beneficial effects of the present invention are:

[0034] 1) This invention pioneered the industrial application of water-based rubber roller coating. By controlling the inert environment and designing a special roller, it overcomes the three major technical difficulties of cross-linking and denaturing water-based rubber during roller coating, bubble generation, and equipment corrosion.

[0035] 2) The present invention has the characteristics of reducing energy consumption, saving manpower and material resources, and efficient production, and can also reduce environmental pollution;

[0036] 3) The glue utilization rate of the present application is increased to 90-95%, and the VOCs emission is reduced to 0.8g / m 2 The comprehensive cost is reduced by 40% compared with the spraying process.

[0037] 4) The present application only produces a small amount of wastewater during use, saving the investment in air treatment and environmental protection equipment required for spraying glue;

[0038] 5) The present application can improve the consistency of material gluing and effectively quantify, which is conducive to the stability of subsequent coating operation and easier to obtain customer trust;

[0039] 6) The present application breaks through the high temperature limitation of hot melt glue roller coating, and can be constructed at room temperature, compatible with all new environmentally friendly substrates sensitive to heat. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some 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 contents of the embodiments of the present application and these drawings.

[0041] Figure 1 A flow chart of the water-based glue application method for the automotive interior industry described in the present application;

[0042] Figure 2 A structural schematic diagram of one angle of the glue application equipment;

[0043] Figure 3 A Figure 2 A cross-sectional view at A-A in the middle;

[0044] Figure 4 A Figure 2 A cross-sectional view at B-B in the middle;

[0045] Figure 5 A structural schematic diagram of the first angle of the glue application equipment;

[0046] Figure 6 A structural schematic diagram of the third angle of the glue application equipment.

[0047] 1, glue tank room; 2, glue feeding pipeline; 3, electromagnetic valve; 4, PLC; 5, high-precision anti-sticking belt; 6, servo drive motor; 7, guide roller; 8, wallboard; 9, coating roller; 10, metering roller; 11, glue tank; 12, glue feeding system liquid level detection and glue outlet pipe; 13, main glue blocking plate; 14, auxiliary glue blocking plate; 15, roller gap adjusting device; 16, glue application amount adjusting system. DETAILED DESCRIPTION

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0049] Example 1

[0050] See Figure 1 This embodiment provides a method for applying water-based glue for the automotive interior decoration industry, comprising the following steps:

[0051] Step 1: Preparation, as follows:

[0052] 11) Confirm process parameters according to product process;

[0053] 12) Confirm that environmental conditions meet production requirements;

[0054] Environmental conditions that meet production requirements are as follows:

[0055] Temperature 0-5℃, humidity 30-60%, no fog or dew, no direct sunlight.

[0056] 13) Confirm that the equipment is operating normally.

[0057] Step 2: Debug the equipment, as follows:

[0058] 21) Set the machine speed according to the product process;

[0059] The machine running speed is 0-5m / min (related to the process parameters, the speed needs to be reduced if the amount of glue applied is large); the pressure of the roller in step 22) is 200N-500N; the heating temperature in step 23) is 50-70°C.

[0060] 22) Adjust the roller pressure according to the product process;

[0061] 23) Adjust the heating temperature according to the product process.

[0062] Step 3: Determine the water-based glue according to customer needs and place it in the glue tank room;

[0063] Step 4: Apply glue to the fabrics that need to be bonded in the automotive interior industry through the glue applying device;

[0064] Step 5: Dry and peel off the sizing fabric.

[0065] Example 2

[0066] See Figure 2-Figure 6This embodiment provides a gluing device for implementing the water-based glue gluing method for the automotive interior industry described in Example 1. The device specifically includes a roller glue machine head, an automatic glue supply system, a material conveying system, a touch screen, a drying device, and a leather glass device. The automatic glue supply system delivers water-based glue to the roller glue machine head, and the fabric to be bonded is conveyed through the material conveying system, and finally glue is applied by the roller glue machine head. The touch screen is connected to a PLC. The fabric after gluing can be dried by the drying device.

[0067] The automatic glue supply system includes a glue tank room, glue delivery pipeline, solenoid valve, and PLC. The glue tank room includes a pressure tank and an electronic scale. The pressure tank is placed on the electronic scale. The pressure tank is connected to the glue delivery pipeline, which is equipped with a solenoid valve. The solenoid valve is controlled by the PLC. Parameters are set on the touch screen. Glue supply has two options: manual and automatic. Manual glue supply is primarily used when there is no clear glue in the glue tank during operation. During pauses or emergency stops during the glue process, the coating roller stops rotating, and the liquid level will be lower than when it is rotating. The system will automatically switch to manual glue supply to prevent glue from overflowing from the glue tank.

[0068] The automatic glue supply system can also be set with alarm settings. When it detects that the remaining glue amount is only higher than the minimum weight of 1kg, the three-color light of the device flashes red and the touch screen prompts "Insufficient glue, please add glue"; when it detects that the glue level is lower than the minimum set value, the device will alarm, automatically shut down, and stop supplying glue.

[0069] The product conveying system includes a high-precision anti-sticking belt, a servo drive motor and a guide roller; the servo drive motor is connected to the guide roller and is controlled by a PLC; and the guide roller is provided with a high-precision anti-sticking belt.

[0070] The high-precision anti-stick belt is made of non-stick material and is easy to clean. The high-precision anti-stick belt is very thin, about 0.45mm thick, and has good thickness uniformity, so it can pass thin materials such as single leather and fabrics. The high-precision anti-stick belt is protected by a steel plate underneath to prevent heavy objects from falling and being damaged.

[0071] The speed of the high-precision anti-sticking belt is preferably synchronized with the coating roller. The synchronous speed can be achieved by parameter setting and will be adjusted before leaving the factory. The power of the high-precision anti-sticking belt and the coating roller are both provided by servo motors.

[0072] The high-precision anti-stick belt is adjusted to be balanced left and right and does not deviate before leaving the factory, and a slot is provided to limit deviation.

[0073] The glue roller head includes a wall panel, a coating roller, a metering roller, a glue tank, a glue supply system level detection and glue outlet pipe, a main rubber stop plate, an auxiliary rubber stop plate, a roller gap adjustment device and a glue amount adjustment system; the glue roller head can move up and down as a whole, and control the gap size between the coating roller and the high-precision anti-sticking belt; an angle is formed between the coating roller and the metering roller to hold the water-based glue; auxiliary rubber stop plates are added on both sides of the water-based glue to form a glue tank; main rubber stop plates are provided on both sides of the auxiliary rubber stop plate; the lower ends of the main rubber stop plate and the auxiliary rubber stop plate are fixed to the coating roller and the metering roller The roller shaft of the coating roller and the metering roller is provided with wall panels at both ends; the liquid level detection and the glue outlet pipe of the glue supply system are connected with the glue feeding pipe; the glue amount adjustment system is controlled by PLC; the gap between the metering roller and the coating roller is adjusted by a roller gap adjustment device; the roller gap adjustment device includes a gap adjustment servo motor, a roller mold clamping cylinder, an adjustment block and a wedge block; the roller mold clamping cylinder clamps the rollers of the coating roller and the metering roller; the gap adjustment servo motor adjusts the distance between the rollers through the distance between the wedge block and the adjustment block.

[0074] The water-based glue adopts a two-component light-curing water-based glue with a viscosity range of 10,000-120,000 CPS, and can be used for any product that requires gluing, such as instrument panels, door panels, ceilings, pillars, sub-panels and other thin-walled profiles or woven products.

[0075] Among them, when the coating roller stops rotating, the glue surface is horizontal; when the coating roller rotates normally, the glue liquid surface is in an arc convex shape.

[0076] Enter the production speed, coating roller gap, and roller height into the recipe menu and save it. The recipe can be called up in two steps: recipe reading and one-touch adjustment.

[0077] The leather stripping device can easily peel off even a single piece of leather, thereby improving operation efficiency and reducing labor.

[0078] The drying device includes a roller glue machine conveyor belt, a drying tunnel conveyor belt and an auxiliary scraper; the fabric is conveyed to the drying tunnel conveyor belt by the roller glue machine conveyor belt for drying; the auxiliary scraper is arranged between the roller glue machine conveyor belt and the drying tunnel conveyor belt to scrape off excess water-based glue.

[0079] The working principle of the sizing equipment is as follows:

[0080] The roller coating equipment transfers the liquid water-based adhesive medium evenly to the surface of the substrate through the relative movement and extrusion of the roller group to form a continuous coating. The core principle is to achieve quantitative transfer and uniform coating of the medium through the mechanical movement of the roller group. Its high efficiency and controllability make it the mainstream choice for coating large-area flat substrates. The water-based adhesive used in the automotive industry is a two-component adhesive that easily reacts in the air, so it is not used in the roller coating industry. The key point of this patent application method is to complete the traditional water-based adhesive spraying method with roller coating. The equipment will adjust the stirring, metering and post-processing systems according to the medium characteristics and substrate requirements (thickness, material) to meet the diverse needs of industrial production.

[0081] In summary, the present invention provides a method for applying water-based glue for the automotive interior decoration industry, which has the following beneficial effects:

[0082] 1) Changing the traditional manual gluing or air gun scattering spraying method to a mechanical automated roller coating method improves production efficiency while also reducing quality uncertainty caused by manual gluing;

[0083] 2) The glue application equipment can realize the thin layer glue coating process of various products, thus achieving a low-cost and high-efficiency production method.

[0084] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for applying water-based glue for the automotive interior industry, characterized in that: The following steps are involved: Step 1: Preparation; Step 2: Debug the equipment; Step 3: Determine the water-based glue according to customer needs and place it in the glue tank room; Step 4: Apply glue to the fabrics that need to be bonded in the automotive interior industry through the glue applying device; Step 5: Dry and peel off the sizing fabric.

2. The method for applying water-based glue for the automotive interior decoration industry according to claim 1, characterized in that: The specific method of step one is as follows: 11) Confirm process parameters according to product process; 12) Confirm that environmental conditions meet production requirements; 13) Confirm that the equipment is operating normally.

3. A method for applying water-based glue for the automotive interior decoration industry according to claim 2, characterized in that: In step 12), the environmental conditions that meet the production requirements are: Temperature 0-5℃, humidity 30-60%, no fog or dew, no direct sunlight.

4. The method for applying water-based glue for the automotive interior decoration industry according to claim 1, characterized in that: The specific method of step 2 is as follows: 21) Set the machine speed according to the product process; 22) Adjust the roller pressure according to the product process; 23) Adjust the heating temperature according to the product process.

5. The method for applying water-based glue for the automotive interior decoration industry according to claim 4, characterized in that: In step 21), the machine operating speed is 0-5 m / min; in step 22), the roller pressure is 200 N-500 N; and in step 23), the heating temperature is 50-70° C.

6. The method for applying water-based glue for the automotive interior decoration industry according to claim 1, characterized in that: The gluing device includes a roller glue head, an automatic glue supply system and a material conveying system; the automatic glue supply system conveys water-based glue to the roller glue head, the fabric to be bonded is conveyed through the material conveying system, and finally the roller glue head applies glue.

7. The method for applying water-based glue for the automotive interior decoration industry according to claim 6, characterized in that: The automatic glue supply system includes a glue tank room, a glue delivery pipeline, a solenoid valve and a PLC; the glue tank room includes a pressure tank and an electronic scale; the pressure tank is placed on the electronic scale; the pressure tank is connected to the glue delivery pipeline; the glue delivery pipeline is provided with a solenoid valve; the solenoid valve is controlled by the PLC.

8. The method for applying water-based glue for the automotive interior decoration industry according to claim 7, characterized in that: The product conveying system includes a high-precision anti-sticking belt, a servo drive motor and a guide roller; the servo drive motor is connected to the guide roller and is controlled by a PLC; and the guide roller is provided with a high-precision anti-sticking belt.

9. The method for applying water-based glue for the automotive interior decoration industry according to claim 8, characterized in that: The glue roller head includes a wall panel, a coating roller, a metering roller, a glue tank, a glue supply system level detection and glue outlet pipe, a main rubber stop plate, an auxiliary rubber stop plate, a roller gap adjustment device and a glue amount adjustment system; the glue roller head can move up and down as a whole, and control the gap size between the coating roller and the high-precision anti-sticking belt; an angle is formed between the coating roller and the metering roller to hold the water-based glue; auxiliary rubber stop plates are added on both sides of the water-based glue to form a glue tank; main rubber stop plates are provided on both sides of the auxiliary rubber stop plate; the lower ends of the main rubber stop plate and the auxiliary rubber stop plate are fixed on the roller shafts of the coating roller and the metering roller; the coating roller and the metering roller form an angle between the coating roller and the metering roller to hold the water-based glue; auxiliary rubber stop plates are added on both sides of the water-based glue to form a glue tank; main rubber stop plates are provided on both sides of the auxiliary rubber stop plate; the lower ends of the main rubber stop plate and the auxiliary rubber stop plate are fixed on the roller shafts of the coating roller and the metering roller; Wall panels are provided at both ends of the roller shaft of the roller; the liquid level detection and glue outlet pipe of the glue supply system are connected to the glue delivery pipe; the glue application amount adjustment system is controlled by PLC; the gap between the metering roller and the coating roller is adjusted by a roller gap adjustment device; the roller gap adjustment device includes a gap adjustment servo motor, a roller mold clamping cylinder, an adjustment block and a wedge block; the roller mold clamping cylinder clamps the rollers of the coating roller and the metering roller; the gap adjustment servo motor adjusts the distance between the middle of the rollers through the distance between the wedge block and the adjustment block, and controls the glue application amount by controlling the gap between the coating roller and the metering roller.

10. The method for applying water-based glue for the automotive interior decoration industry according to claim 6, characterized in that: The gluing device further includes a touch screen and a drying device; the touch screen is connected to a PLC; the gluing fabric can be dried by the drying device; the drying device includes a roller gluing machine conveyor belt, a drying tunnel conveyor belt, and an auxiliary scraper; the fabric is conveyed from the roller gluing machine conveyor belt to the drying tunnel conveyor belt for drying; The auxiliary scraper is arranged between the roller glue machine conveyor belt and the drying tunnel conveyor belt to scrape off excess water-based glue.

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