Efficient leather preparation production line

Abstract

The invention relates to the technical field of leather preparation, in particular to an efficient leather preparation production line which comprises a conveying device, a coating device, a drying device, a cloth unwinding device, a cooling device, a foaming machine, a cloth pasting device and a separating and winding device. The conveying devices are used for conveying release paper, and the multiple conveying devices and the multiple cooling devices are arranged; the drying device comprises a first drying box, a second drying box, a third drying box and a fourth drying box, and the coating device comprises a first coating mechanism and a second coating mechanism. According to the efficient leather preparation production line provided by the invention, a plurality of procedures such as release paper coating, foaming material blending, foaming forming and drying and curing can be sequentially completed on the same machine through a continuous production system integrating coating and foaming functions, so that the production efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of leather preparation, and in particular to an efficient leather preparation production line. Background Art

[0002] In traditional leather-making processes, the production of synthetic leather or artificial leather usually involves two separate production lines: one for making coatings on release paper, and the other for the foaming process line. Although this separated production method can ensure quality control at each step, it also brings significant problems, especially low efficiency and high costs.

[0003] Segmented production process: First, on the first production line, one or more layers of liquid materials with specific formulations need to be coated on the release paper to form a base coating. These coatings can be materials such as polyurethane (PU) and polyvinyl chloride (PVC), which provide the support and adhesion basis for the subsequent foaming layer. However, this process itself requires precise temperature and humidity control as well as uniform coating quality, and any deviation may lead to defects in the final product.

[0004] Foaming process line: Next, the semi-finished product needs to be transferred to the second production line for foaming treatment. This includes complex processes such as material preparation, spontaneous reaction, foaming, and high-temperature baking. During the foaming process, gases (such as carbon dioxide) generated by chemical reactions cause the liquid material to expand into a foam shape, and then solidify at high temperature to form an elastic and flexible surface layer. Since the transfer between these two production lines increases the operation difficulty and time consumption, it not only reduces the overall production efficiency but also may lead to a decline in product quality due to accidents during the handling process.

[0005] High costs and low efficiency: The above segmented production mode requires more equipment investment, space occupation, and human resources. At the same time, it also increases energy consumption and waste generation. For example, each time the product is transferred from one production line to another, it is necessary to stop the machine and wait, which directly results in a waste of production capacity. In addition, due to the difficulty in coordinating between different production lines, batch-to-batch differences are likely to occur, affecting the stability and consistency of the product.

[0006] With the growing market demand for high-quality and low-cost synthetic leather, the traditional segmented production process can no longer meet the requirements of modern manufacturing. In order to improve production efficiency, reduce costs, and ensure product quality consistency, there is an urgent need in the industry for an integrated solution, that is, to complete all necessary processing steps on the same production line. Summary of the Invention

[0007] The present invention provides an efficient leather preparation production line for solving the problems of the prior art. By using a foaming machine and integrating it into the same production line, the basic coating and the foaming layer can be processed simultaneously, achieving efficient leather production.

[0008] To solve the above technical problems, the present invention adopts the following technical solutions: An efficient leather preparation production line includes a conveying device, a coating device, a drying device, a cloth feeding device, a cooling device, a foaming machine, a cloth pasting device, and a separating and winding device; the conveying device is used for conveying release paper, and multiple conveying devices and cooling devices are provided.

[0009] The drying device includes a first drying oven, a second drying oven, a third drying oven, and a fourth drying oven, and the coating device includes a first coating mechanism and a second coating mechanism.

[0010] The conveying device transports the release paper to the first coating mechanism, and the first coating mechanism is used for uniformly coating a first coating layer on the release paper and transporting the release paper to the first drying oven for drying; after the release paper with the first coating layer is dried, it enters the cooling device between the first drying oven and the foaming machine for cooling.

[0011] After the release paper with the first coating layer is cooled, it is conveyed by the conveying device to the foaming machine. The foaming machine coats a foaming layer on the first coating layer and performs foaming control. After foaming, the release paper is transported to the second drying oven for drying; after drying, it is cooled by the cooling device, and the cooled release paper is transported by the conveying device to the second coating mechanism.

[0012] The second coating layer is coated on the foaming layer through the second coating mechanism, and the release paper is transported by the conveying device to the third drying oven for drying.

[0013] The cloth feeding device is located between the third drying oven and the fourth drying oven and is used for providing cloth; after the release paper is dried and cooled in the third drying oven, the cloth is pasted to the dried release paper through the cloth pasting device and transported by the conveying device to the fourth drying oven for drying.

[0014] The separating and winding device is used for separating the dried release paper from the cloth and recycling the formed cloth.

[0015] Preferably, the length of the first drying oven is 20m, the length of the second drying oven is 35m, the length of the third drying oven is 15m, and the length of the fourth drying oven is 15m.

[0016] Preferably, the first drying box includes a plurality of first drying zones with different temperatures; the second drying box includes a plurality of second drying zones with different temperatures; the third drying box includes a plurality of third drying zones with different temperatures; the fourth drying box includes a plurality of fourth drying zones with different temperatures.

[0017] Preferably, it further includes a paper inspection device for checking whether the release paper can be used normally.

[0018] Preferably, the cloth feeding device includes a cloth rack and a cloth transmission mechanism. The cloth rack is used to place the cloth to be used, and the cloth transmission mechanism is used to transmit the cloth on the cloth rack to the cloth pasting device.

[0019] Preferably, the cloth transmission mechanism includes a transmission machine frame, a plurality of transmission rollers installed on the transmission machine frame, and a tension adjustment component for adjusting the cloth transmission tension. The cloth is transmitted to the cloth pasting device through the transmission of the plurality of transmission rollers, and the tension adjustment component is used to adjust the distance between the transmission rollers to adjust the tension of the cloth.

[0020] Preferably, the cloth pasting device includes a cloth pasting roller and a cloth pasting transmission mechanism. The cloth feeding device is located above the cloth pasting device. The dried release paper with coating and the cloth are pasted at the cloth pasting roller and transmitted to the fourth drying box by the cloth pasting transmission mechanism.

[0021] Advantages of the present invention:

[0022] 1. Simplify the process flow: Through a continuous production system integrating coating and foaming functions, multiple processes such as release paper coating, foaming material preparation, foaming molding, and drying and curing can be sequentially completed on the same machine. This integrated design greatly simplifies the complex operations in the traditional segmented production process, reducing the time loss and logistics costs in the intermediate links.

[0023] 2. Reduce equipment and space requirements: Since all necessary processing steps are completed on a continuous production line, there is no longer a need to equip dedicated equipment and sites for each independent process. This not only saves a large amount of fixed asset investment but also effectively utilizes the space resources of the factory, enabling the enterprise to achieve higher production capacity output within a limited area. In addition, reducing the number of equipment also helps to reduce maintenance costs and energy consumption.

[0024] 3. Reduce human resource input: The improvement of automation ensures that each step is carried out under the best conditions, thereby reducing the need for skilled workers and reducing product quality problems caused by human errors. Description of the Drawings

[0025] Figure 1 is a flowchart of the present invention;

[0026] Figure 2 is a schematic structural diagram of the production line of the present invention;

[0027] Figure 3 is a schematic structural diagram of the fabric feeding device and the fabric pasting device of the present invention.

[0028] In Figures 1 to 3 the reference numerals include:

[0029] 1 - conveying device, 2 - first drying oven, 3 - second drying oven, 4 - third drying oven, 5 - fourth drying oven, 6 - first coating mechanism, 7 - second coating mechanism, 8 - foaming machine, 9 - fabric feeding device, 10 - cooling device, 11 - fabric pasting device, 12 - separating and winding device, 13 - paper inspection device, 14 - fabric rack, 15 - driving frame, 16 - conveying roller, 17 - tension adjusting assembly, 18 - fabric pasting roller, 19 - fabric pasting conveying mechanism. Specific embodiments

[0030] For the convenience of those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the embodiments does not limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings.

[0031] An efficient leather preparation production line provided in this embodiment, as shown in Figures 1 to 3 , includes a conveying device 1, a coating device, a drying device, a fabric feeding device 9, a cooling device 10, a foaming machine 8, a fabric pasting device 11, and a separating and winding device 12; the conveying device 1 is used to convey the release paper, and a plurality of the conveying device 1 and the cooling device 10 are provided;

[0032] The drying device includes a first drying oven 2, a second drying oven 3, a third drying oven 4, and a fourth drying oven 5, and the coating device includes a first coating mechanism 6 and a second coating mechanism 7;

[0033] The conveying device 1 transports the release paper to the first coating mechanism 6, and the first coating mechanism 6 is used to uniformly coat a first coating layer on the release paper and transport the release paper to the first drying oven 2 for drying; after the release paper with the first coating layer is dried, it enters the cooling device 10 between the first drying oven 2 and the foaming machine 8 for cooling;

[0034] After the release paper with the first coating layer is cooled, it is conveyed by the conveying device 1 to the foaming machine 8. The foaming machine 8 coats a foaming layer on the first coating layer and conducts foaming control. After foaming is completed, the release paper is transferred to the second drying oven 3 for drying; after drying, it is cooled by the cooling device 10, and the cooled release paper is transferred by the conveying device 1 to the second coating mechanism 7; the second coating mechanism 7 coats a second coating layer on the foaming layer, and the release paper is transferred by the conveying device 1 to the third drying oven 4 for drying; the cloth feeding device 9 is located between the third drying oven 4 and the fourth drying oven 5 and is used to supply cloth; for the release paper that has been dried and cooled in the third drying oven 4, the cloth is adhered to the dried release paper by the cloth adhering device 11 and is transferred by the conveying device 1 to the fourth drying oven 5 for drying; the separating and winding device 12 is used to separate the dried release paper from the cloth and recycle the formed cloth.

[0035] Specifically, as Figures 1 to 3 shown, the production line of this embodiment is, from left to right in sequence: the conveying device 1, the first coating mechanism 6, the first drying oven 2, the cooling device 10, the conveying device 1, the foaming machine 8, the second drying oven 3, the cooling device 10, the conveying device 1, the second coating mechanism 7, the third drying oven 4, the cooling device 10, the conveying device 1, the cloth adhering device 11, the fourth drying oven 5, the cooling device 10, and the separating and winding device 12. Among them, a coating mechanism can be added before or after the foaming machine 8 according to the actual leather thickness and softness for selection. This embodiment uses the foaming machine 8 to combine the foaming and base coating processes on the same production line, which can greatly improve production efficiency. Moreover, by using the foaming machine 8 to make the foaming layer, key parameters (such as temperature, pressure, flow rate, etc.) can be monitored and adjusted in real time to ensure that the performance indicators of each batch of products are consistent. Especially for those processes that are sensitive to environmental conditions, such as foaming molding and drying and curing, precise temperature and humidity control can reduce product differences.

[0036] Furthermore, the length of the first drying oven 2 in this embodiment is 20 m, the length of the second drying oven 3 is 35 m, the length of the third drying oven 4 is 15 m, and the length of the fourth drying oven 5 is 15 m. Among them, each drying oven is divided into multiple drying zones, that is, the first drying oven 2 includes several first drying zones, and the temperatures of different first drying zones are different; the second drying oven 3 includes several second drying zones, and the temperatures of different second drying zones are different; the third drying oven 4 includes several third drying zones, and the temperatures of different third drying zones are different; the fourth drying oven 5 includes several fourth drying zones, and the temperatures of different fourth drying zones are different. The temperature of each drying zone can be adjusted according to actual needs, which helps to protect the coating layer.

[0037] This embodiment is also provided with a paper inspection device 13 for the release paper. After the release paper is peeled off from the patch cloth, it can be reused, so it is also necessary to inspect the release paper before each use. As an implementation manner, the paper inspection device 13 may include an image collector, which collects the image information of the release paper in real time and transmits it to the corresponding controller. The controller compares the collected image information with the image information of the standard release paper to determine whether there are defects or other problems with the used release paper. If there are problems, it will immediately control the stop of the release paper transmission and notify the staff for processing, thereby improving the quality qualification rate of the final product. In addition, sensors can also be set to detect whether the thickness and flatness of the release paper are normal. If they do not meet the standards, the staff will be notified for processing, thereby reducing the defects of the final product.

[0038] As Figures 1 to 3 shown, the cloth placing device 9 of this embodiment includes a cloth rack 14 and a cloth transmission mechanism. The cloth rack 14 is used to place the cloth to be used, and the cloth transmission mechanism is used to transmit the cloth on the cloth rack 14 to the patch cloth device 11; the cloth transmission mechanism includes a transmission machine frame 15, a number of transmission rollers 16 installed on the transmission machine frame 15, and a tension adjustment component 17 for adjusting the cloth transmission tension. The cloth is transmitted to the patch cloth device 11 through the transmission of a number of the transmission rollers 16, and the tension adjustment component 17 is used to adjust the distance between the transmission rollers 16 to adjust the tension of the cloth.

[0039] Specifically, the cloth roll to be used is placed on the cloth rack 14, and the cloth is driven to move by the cloth transmission mechanism. Among them, two rows of transmission rollers 16 are arranged on the transmission machine frame 15, divided into upper and lower rows. As shown in the figure, the tension adjustment component 17 can adopt a pulley structure to adjust the height of the lower row of transmission rollers 16, and then adjust the distance between the upper and lower rows of transmission rollers 16, thereby adjusting the transmission tension of the cloth and avoiding pulling the cloth.

[0040] As Figures 1 to 3 shown, the patch cloth device 11 includes a patch cloth roller 18 and a patch cloth transmission mechanism 19. The cloth placing device 9 is located above the patch cloth device 11. The dried release paper with coating and the patch cloth are bonded at the patch cloth roller 18 and transmitted to the fourth drying box 5 by the patch cloth transmission mechanism 19. Specifically, before patching, there is an adhesive layer on the release paper. Therefore, the cloth is transmitted to the patch cloth roller 18 so that the cloth is bonded to the adhesive layer. Under the rotation and transmission of the patch cloth roller 18, the cloth and the release paper are evenly adhered, and then through the drying effect of the fourth drying box 5, finally the release paper is separated by the separation and winding device 12, and the recycling work of the finished product is completed. The separation and winding device 12 is a prior art and will not be elaborated here.

[0041] The preparation process of the coating layer in this embodiment is prior art, and the cooling device 10 is also prior art, so no limitations and elaborations will be made here.

[0042] In this embodiment, through a continuous production system that integrates coating and foaming functions, multiple processes such as release paper coating, foaming material preparation, foaming molding, and drying and curing can be sequentially completed on the same machine. This integrated design greatly simplifies the complex operations in the traditional segmented production process, reduces the time loss and logistics costs in the intermediate links. Compared with the traditional two-production-line mode, the new technical solution can significantly shorten the production cycle and improve the throughput of the overall production line. The introduction of the continuous production system makes the entire production process more transparent and controllable. With the help of advanced sensor technology and automatic control systems, key parameters (such as temperature, pressure, flow rate, etc.) can be monitored and adjusted in real time to ensure that the performance indicators of each batch of products remain consistent. Especially for processes that are sensitive to environmental conditions, such as foaming molding and drying and curing, precise temperature and humidity control is particularly important. In this way, not only can the common batch-to-batch differences in the traditional method be avoided, but also the quality level of the finished products can be significantly improved.

[0043] Since all necessary processing steps are completed on a continuous production line, there is no longer a need to allocate dedicated equipment and sites for each independent process. This not only saves a large amount of fixed asset investment but also effectively utilizes the space resources of the factory, enabling the enterprise to achieve higher production capacity output within a limited area; in addition, reducing the number of equipment also helps to reduce maintenance costs and energy consumption. Additionally, product quality problems caused by human errors are reduced. Further, with the use of the foaming machine 8, the preparation and application of the foaming material are optimized, ensuring the uniformity and stability of the foam layer, which helps to form a more delicate, dense, and elastic synthetic leather surface layer, enhancing its physical properties such as wear resistance, tear resistance, and flexibility. Moreover, due to the reduction of possible damage during handling, the appearance of the final product is also smoother and flatter, with better visual effects and touch.

[0044] The above are only preferred embodiments of the present invention, and there is no restriction in any form on the present invention. Although the present invention is disclosed above in preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content into equivalent embodiments of equivalent changes, but as long as they do not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments according to the technical meaning of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. An efficient leather preparation production line, characterized by: It includes a conveying device, a coating device, a drying device, a cloth placing device, a cooling device, a foaming machine, a cloth sticking device and a separation and winding device; the conveying device is used to convey the release paper, and the conveying device and the cooling device are both provided with a plurality of them; The drying device includes a first drying box, a second drying box, a third drying box and a fourth drying box, and the coating device includes a first coating mechanism and a second coating mechanism; The conveying device transfers the release paper to the first coating mechanism, which is used to evenly coat the release paper with a first coating layer and transfer the release paper to the first drying box for drying; after drying, the release paper with the first coating layer enters the cooling device between the first drying box and the foaming machine for cooling; After cooling, the release paper with the first coating layer is conveyed to the foaming machine by the conveying device, and the foaming machine coats the foaming layer on the first coating layer and performs foaming control. After the foaming is completed, the release paper is conveyed to the second drying box for drying; after drying, it is cooled by the cooling device, and the cooled release paper is conveyed to the second coating mechanism by the conveying device; The second coating mechanism is used to apply a second coating layer on the foaming layer, and the release paper is transferred to a third drying box for drying by a conveying device; The cloth placing device is located between the third drying box and the fourth drying box and is used to provide cloth; the release paper that has been dried and cooled in the third drying box is laminated with the dried release paper by the cloth pasting device and is conveyed to the fourth drying box for drying by the conveying device; The separation and winding device is used to separate the dried release paper from the cloth and to recycle the formed cloth.

2. An efficient leather production line according to claim 1, characterized in that: The length of the first drying box is 20 m, the length of the second drying box is 35 m, the length of the third drying box is 15 m, and the length of the fourth drying box is 15 m.

3. An efficient leather production line according to claim 1, characterized in that: The first drying box includes several first drying zones, and different first drying zones have different temperatures; the second drying box includes several second drying zones, and different second drying zones have different temperatures; the third drying box includes several third drying zones, and different third drying zones have different temperatures; the fourth drying box includes several fourth drying zones, and different fourth drying zones have different temperatures.

4. An efficient leather production line according to claim 1, characterized in that: It also includes a paper inspection device, which is used to check whether the release paper can be used normally.

5. The efficient leather production line according to claim 1, characterized in that: The cloth placing device comprises a cloth rack and a cloth transmission mechanism, wherein the cloth rack is used to place the cloth to be used, and the cloth transmission mechanism is used to transmit the cloth on the cloth rack to the cloth applying device.

6. An efficient leather production line according to claim 5, characterized in that: The cloth transmission mechanism includes a transmission frame, a plurality of transmission rollers mounted on the transmission frame, and a tension adjustment component for adjusting the cloth transmission tension. The cloth is moved to the cloth-attaching device via the transmission of the plurality of transmission rollers. The tension adjustment component is used to adjust the distance between the transmission rollers to adjust the tension of the cloth.

7. An efficient leather production line according to claim 1, characterized in that: The patch device includes a patch roller and a patch conveying mechanism. The cloth placing device is located above the patch device. The dried release paper with coating and the patch are pasted on the patch roller and conveyed to the fourth drying box by the patch conveying mechanism.

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