Preparation method of polyvinyl chloride tarpaulin with flat surface

Abstract

The invention relates to the technical field of polyvinyl chloride tarpaulin, in particular to a preparation method of polyvinyl chloride tarpaulin with a flat surface, which comprises the following steps: adjusting the sending positions of a surface film and a bottom film to enable the bottom film to be positioned above the surface film; the thickness of the surface film is more than twice that of the bottom film; a pasting device is adopted for pasting the polyester fiber mesh cloth, paste containing a viscosity reducer is used, and the viscosity of the paste is 300-500 cps; and preheating the pasted screen cloth to 140-150 DEG C, and laminating the screen cloth with the PVC film. The method has the beneficial effects that in a traditional laminating process of the polyvinyl chloride tarpaulin, the sending position of the surface film and the bottom film is generally that the surface film is above the bottom film, and the bottom film is below the surface film. The bottom film is designed to be relatively thin and needs to be pressed by a pressing roller for multiple times when being attached to the base cloth, so that the problems of aeration, bubbles and concave holes are easily caused. Therefore, the sending position of the surface film and the bottom film is adjusted, the surface film is arranged below the bottom film, the bottom film only needs to be pressed by the pressing roller twice, and the aeration risk can be effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of polyvinyl chloride tarpaulins, and specifically relates to a preparation method of a polyvinyl chloride tarpaulin with a flat surface. Background Art

[0002] In recent years, polyvinyl chloride (PVC) tarpaulins have been widely used in the fields of logistics, construction, outdoor equipment, etc. due to their light weight, waterproofness, strong weather resistance and other characteristics. However, in the traditional PVC tarpaulin production process, problems such as surface bubbles, concave holes, wrinkles, etc. are common, which seriously affect the flatness, aesthetics and service life of the material. These problems mainly stem from the feeding method of "the surface film on top and the bottom film at the bottom" in the traditional process, resulting in the bottom film needing to be processed by a pressing roller multiple times due to its relatively thin thickness, causing the phenomenon of air entrapment.

[0003] In addition, the traditional padding and pasting method has problems such as large dosage and uneven distribution of the paste, resulting in poor bonding performance between the base fabric and the PVC film, and it is difficult to discharge the residual bubbles. At the same time, the viscosity of the traditional paste is too high (500 - 2000 cps), and its permeability is poor, so it cannot completely fill the pores of the polyester fiber mesh fabric, and the residual air forms pits. These problems not only affect the surface quality of the tarpaulin, but also may lead to a shortening of the weather resistance and service life of the material. Summary of the Invention

[0004] In the prior art, there are problems such as surface bubbles and concave holes in the production process of PVC tarpaulins, resulting in poor flatness and aesthetics of the material. Therefore, in order to solve the above problems, the present invention provides a preparation method of a tarpaulin material with a flat surface.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: to provide a preparation method of a polyvinyl chloride tarpaulin with a flat surface, the polyvinyl chloride tarpaulin includes a PVC film provided on its surface, the PVC film includes a surface film and a bottom film, and is characterized in that it includes the following steps: Adjust the feeding positions of the surface film and the bottom film so that the bottom film is located above the surface film; the thickness of the surface film is more than twice the thickness of the bottom film; Use a padding and pasting device to apply paste to the polyester fiber mesh fabric, and use a paste containing a viscosity reducer, and the viscosity of the paste is 300 - 500 cps; Preheat the paste-applied fabric to 140 - 150 °C and bond it with the PVC film; The padding and pasting device includes a padding and pasting assembly and a pressing roller assembly; The padding and pasting assembly includes a silk mesh roller and a coating roller whose axes are parallel to each other and whose outer cylindrical surfaces are in contact with each other; The pressing roller assembly includes a first pressing roller and a second pressing roller; The coating roller is arranged between the first pressing roller and the second pressing roller, and the axes of the three are parallel to each other; The polyester fiber mesh is successively wound around the first pressing roller, the coating roller, and the second pressing roller.

[0006] Advantages of the present invention: (1) In the traditional laminating process of polyvinyl chloride tarpaulins, the sending positions of the top and bottom films are usually with the top film on top and the bottom film below. Since the bottom film is designed to be relatively thin and needs to be pressed by multiple pressing rollers when laminated to the base fabric, it is easy to cause air entrapment and problems such as air bubbles and concave holes. Therefore, the sending positions of the top and bottom films are adjusted to have the top film below and the bottom film above. The bottom film only needs to be pressed by the pressing roller twice, which can effectively reduce the risk of air entrapment.

[0007] (2) Optimize the paste application method for the mesh. In the original dip-coating paste application method, the mesh is directly immersed in the paste, resulting in a large amount of paste application, which affects the bonding performance between the base fabric and the PVC film and increases the probability of air bubbles and concave holes. Optimize the paste application method for the mesh and use a new paste application device, namely a silk-mesh roller and a coating roller with their outer cylindrical surfaces in contact with each other. During the rolling process, the excess paste can be removed by extrusion, thereby ensuring the uniformity of the paste transferred to the outer cylindrical surface of the coating roller. Then, the coil material is pressed tightly against the outer cylindrical surface of the coating roller through the pressing roller assembly, so that the paste on the outer cylindrical surface of the coating roller can be completely transferred to the surface of the coil material, thus ensuring that the thickness of the bonding layer meets the design requirements.

[0008] (3) Improve the paste formulation. The viscosity of the paste is a key factor affecting the permeability of the paste and the amount of paste applied to the mesh. The low-viscosity paste increases the pore filling rate of the mesh to 98%, increases the tensile strength retention rate by 20% (80% in the traditional process), and extends the service life to more than 5 years.

[0009] (4) Adjust the laminating process parameters. There is a certain distance between the paste drying position on the polyester fiber mesh and the film lamination position, which will cause the surface temperature of the mesh to drop, resulting in poor lamination between the base fabric and the film. By raising the temperature of the mesh preheating roller to 140 - 150 °C, the dried and plasticized paste is softened, reducing the risk of air entrapment during lamination and ensuring that no air bubbles are generated during the lamination process, obtaining a tarpaulin material with a flat surface and no air bubbles or concave holes. Description of the drawings

[0010] Figure 1 The figure shows a schematic structural diagram of the paste application device in Embodiment 1 of the specific embodiment of the present invention; Figure 2 The figure shows a working principle diagram of the paste application device in Embodiment 1 of the specific embodiment of the present invention; Figure 3 is a polyvinyl chloride tarpaulin prepared by the prior art; Figure 4 is a polyvinyl chloride tarpaulin with a flat surface obtained by the technical solution of Embodiment 1 of the present application.

[0011] Label description: 1. Sizing component; 11. Silk-eye roller; 12. Coating roller; 2. Pressing roller component; 21. First pressing roller; 22. Second pressing roller; 23. Displacement device; 3. Heating roller; 4. Frame; 41. Material tank; 42. Guide roller; 5. Coiled material. Specific implementation manner

[0012] To describe in detail the technical content, achieved purpose and effects of the present invention, the following is described in conjunction with the implementation manners and with reference to the accompanying drawings.

[0013] The present invention provides a method for preparing a polyvinyl chloride tarpaulin with a flat surface. The polyvinyl chloride tarpaulin includes a PVC film provided on its surface. The PVC film includes a top film and a bottom film. It is characterized by including the following steps: Adjust the feeding positions of the top film and the bottom film so that the bottom film is located above the top film; the thickness of the top film is more than twice the thickness of the bottom film; Use a sizing device to size the polyester fiber mesh fabric, and use a paste containing a viscosity reducer. The viscosity of the paste is 300 - 500 cps; Preheat the sized mesh fabric to 140 - 150 °C and bond it with the PVC film; The sizing device includes a sizing component and a pressing roller component; The sizing component includes a silk-eye roller and a coating roller whose axes are parallel to each other and whose outer cylindrical surfaces are in contact with each other; The pressing roller component includes a first pressing roller and a second pressing roller; The coating roller is arranged between the first pressing roller and the second pressing roller, and the axes of the three are parallel to each other; The polyester fiber mesh fabric sequentially passes around the first pressing roller, the coating roller and the second pressing roller.

[0014] Further, in the above method for preparing a polyvinyl chloride tarpaulin with a flat surface, the paste is made from raw materials in the following weight ratio: 100 parts of E-PVC, 110 parts of DOP, 30 parts of heavy calcium, 3 parts of stabilizer, 3 parts of viscosity reducer, 3 parts of defoaming agent; the viscosity of the paste is 400 cps.

[0015] Further, in the above method for preparing a polyvinyl chloride tarpaulin with a flat surface, the viscosity reducer is polyvinylpyrrolidone, and the defoaming agent is an organosilicon defoaming agent.

[0016] Further, in the above method for preparing a polyvinyl chloride tarpaulin with a flat surface, both the first pressing roller and the second pressing roller include a support shaft and a roller body; The roller body is sleeved outside the support shaft, and the roller body is rotatably connected to the support shaft; The roller body is connected to the movable end of the displacement device through a support shaft.

[0017] Further, in the method for preparing the above-mentioned flat polyvinyl chloride tarpaulin, the pasting device further includes a heating roller; the polyester fiber mesh is sequentially wound around the first pressing roller, the coating roller, the second pressing roller, and the heating roller.

[0018] As can be seen from the above description, the above settings adjust the tension of the coiled material through the pressing rollers to improve the coating consistency. The heating roller can heat the coiled material after pasting during the movement of the coiled material, so that the subsequent coiled material can better adhere to other materials, thereby improving the quality of the finished product.

[0019] Further, in the method for preparing the above-mentioned flat polyvinyl chloride tarpaulin, the pasting device further includes a frame; The pasting assembly, the pressing roller assembly, and the heating roller are all connected to the frame; The axes of the screen roller, the coating roller, the first pressing roller, the second pressing roller, and the heating roller are all perpendicular to the plane where the frame is located.

[0020] Further, in the method for preparing the above-mentioned flat polyvinyl chloride tarpaulin, a material tank is further provided on the frame; The opening of the material tank is arranged facing the outer circumferential surface of the screen roller; Vertically, the projection area of the screen roller is within the opening range of the material tank; Part of the screen roller is located in the material tank.

[0021] As can be seen from the above description, the above settings ensure continuous supply of the paste and avoid coating interruption.

[0022] Further, in the method for preparing the above-mentioned flat polyvinyl chloride tarpaulin, the coating roller is a rubber roller.

[0023] As can be seen from the above description, setting the pasting roller as a rubber roller makes the paste coating more uniform.

[0024] Example 1 Please refer to Figure 1 and Figure 2 , a method for preparing a flat polyvinyl chloride tarpaulin, the preparation method uses a pasting device; The sizing device includes a sizing component 1, a pressure roller component 2, a scraping device, a heating roller 3 and a frame 4; the sizing component 1 includes a silk mesh roller 11 and a coating roller 12 with parallel axes and mutually fitting outer cylindrical surfaces; the pressure roller component 2 includes a first pressure roller 21, a second pressure roller 22 and a displacement device 23; the coating roller 12 is arranged between the first pressure roller 21 and the second pressure roller 22, and the axes of the three are parallel to each other; the coil material 5 (polyester fiber mesh cloth) sequentially winds around the first pressure roller 21, the coating roller 12 and the second pressure roller 22; the scraping end of the scraping device is arranged towards the outer cylindrical surface of the silk mesh roller 11; displacement devices 23 are provided at any one end of the first pressure roller 21 and any one end of the second pressure roller 22; the axes of the first pressure roller 21 and the second pressure roller 22 are both perpendicular to the moving direction of the displacement device 23; the displacement device 23 can drive the first pressure roller 21 and the second pressure roller 22 to approach or move away from the coating roller 12; both the first pressure roller 21 and the second pressure roller 22 include a support shaft and a roller body; the roller body is sleeved outside the support shaft, and the roller body is rotatably connected to the support shaft; the roller body is connected to the movable end of the displacement device 23 through the support shaft; the coil material sequentially winds around the first pressure roller 21, the coating roller 12, the second pressure roller 22 and the heating roller 3.

[0025] The sizing component 1, the pressure roller component 2 and the heating roller 3 are all connected to the frame 4; the axes of the silk mesh roller 11, the coating roller 12, the first pressure roller 21, the second pressure roller 22 and the heating roller 3 are all perpendicular to the plane where the frame 4 is located; a material tank 41 and a guide roller 42 are also provided on the frame 4; the opening of the material tank 41 is arranged towards the outer cylindrical surface of the silk mesh roller 11; along the vertical direction, the projection area of the silk mesh roller 11 is within the opening range of the material tank 41; a part of the silk mesh roller 11 is located inside the material tank 41; the guide roller 42 is arranged on the moving path of the coil material, and the outer cylindrical surface of the guide roller 42 abuts against the surface of the coil material.

[0026] The preparation method is specifically as follows: Step 1: Adjust the sending position of the surface and bottom films so that the bottom film is above the surface film; use a pressure roller and a displacement adjustment device to dynamically adjust the bottom film tension. Step 2: Use the above sizing device to size the polyester fiber mesh cloth; the sizing amount is controlled at 30 - 150 gsm.

[0027] Step 3: Use a paste formula containing a viscosity reducer. Step 301: Formula composition: 100 kg of E-PVC, 100 - 150 kg of DOP, 10 - 50 kg of heavy calcium, 2 - 4 kg of stabilizer, 2 - 5 kg of viscosity reducer, 2 - 5 kg of defoamer. Step 302: Control the paste viscosity at 300 - 500 cps by adding a viscosity reducer and a defoamer. Step 303: Use silicone defoamers in combination with the jet cleaning technology of the aluminum foil leveling device to further reduce the residual bubbles in the paste.

[0028] Step 4: Preheat the pasted mesh cloth to 140 - 150 °C and laminate it with the PVC film.

[0029] Please refer to Figure 3 and Figure 4 , Figure 3 For the PVC tarpaulin that does not use a pasting device in the prior art and uses a traditional paste (viscosity 500 - 2000 cps), Figure 4 This is the PVC tarpaulin with a flat surface obtained by the technical solution of Example 1 of this application.

[0030] In the preparation method of the PVC tarpaulin with a flat surface of the present invention, by adjusting the film sending position and optimizing the pasting process, the number of pressing times is reduced, and the generation of bubbles and concave holes is reduced. Through multi-dimensional innovation, the comprehensive performance of the PVC tarpaulin is significantly improved. After adjusting the sending positions of the surface and bottom films, the air entrapment rate is reduced by more than 60%, and the surface bubble density is reduced from ≥5 bubbles / ㎡ in the traditional process to ≤1 bubble / ㎡. The pasting device includes a screen roller and a coating roller, and the excess paste is removed by extrusion between the rollers (the pasting device of this application refers to CN222241027U, a pasting device), ensuring uniform coating of the paste. The winding tension is adjusted by the pressure roller to improve the coating consistency. Through the optimization of the lamination process, the peel strength between the base cloth and the PVC film is increased from 15 N / cm to 25 N / cm, the pasting amount is reduced by 30%, and the raw material cost is reduced by 12%; after integrating the detection system, the qualified product rate is increased from 90% to 98%.

[0031] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A preparation method of a polyvinyl chloride tarpaulin with a flat surface, the polyvinyl chloride tarpaulin includes a PVC film provided on its surface, and the PVC film includes a surface film and a bottom film, characterized in that, It includes the following steps: Adjust the sending positions of the facial mask and the bottom film so that the bottom film is located above the facial mask; the thickness of the facial mask is more than twice the thickness of the bottom film; Apply paste to the polyester fiber mesh cloth by using a paste applying device, and use a paste containing a viscosity reducing agent, and the viscosity of the paste is 300 - 500 cps; Preheat the paste-applied mesh cloth to 140 - 150 °C and laminate it with the PVC film; The paste applying device includes a paste applying assembly and a pressure roller assembly; The paste applying assembly includes a silk screen roller and a coating roller whose axes are parallel to each other and whose outer circumferential surfaces are in contact with each other; The pressure roller assembly includes a first pressure roller and a second pressure roller; The coating roller is arranged between the first pressure roller and the second pressure roller, and the axes of the three are parallel to each other; The polyester fiber mesh cloth sequentially winds around the first pressure roller, the coating roller and the second pressure roller.

2. The preparation method of the PVC tarpaulin with a flat surface according to claim 1, characterized in that The paste is made from raw materials with the following weight ratio: 100 parts of E-PVC, 110 parts of DOP, 30 parts of heavy calcium, 3 parts of stabilizer, 3 parts of viscosity reducing agent, 3 parts of defoaming agent; the viscosity of the paste is 400 cps.

3. The preparation method of the PVC tarpaulin with a flat surface according to claim 2, characterized in that, The viscosity reducing agent is polyvinylpyrrolidone, and the defoaming agent is a silicone defoaming agent.

4. The preparation method of the PVC tarpaulin with a flat surface according to claim 1, characterized in that, Both the first pressure roller and the second pressure roller include a support shaft and a roller body; The roller body is sleeved outside the support shaft, and the roller body is rotatably connected to the support shaft; The roller body is connected to the movable end of the displacement device through the support shaft.

5. The preparation method of the PVC tarpaulin with a flat surface according to claim 1, characterized in that, The paste applying device further includes a heating roller; the polyester fiber mesh cloth sequentially winds around the first pressure roller, the coating roller, the second pressure roller and the heating roller.

6. The preparation method of the PVC tarpaulin with a flat surface according to claim 1, characterized in that, The paste applying device further includes a frame; the paste applying assembly, the pressure roller assembly and the heating roller are all connected to the frame; The axes of the silk screen roller, the coating roller, the first pressure roller, the second pressure roller and the heating roller are all perpendicular to the plane where the frame is located.

7. The preparation method of the PVC tarpaulin with a flat surface according to claim 6, characterized in that, A material tank is further arranged on the frame; The opening of the material tank is arranged facing the outer circumferential surface of the silk screen roller; Vertically, the projection area of the silk screen roller is within the opening range of the material tank; Part of the silk screen roller is located inside the material tank.

8. The preparation method of the PVC tarpaulin with a flat surface according to claim 6, characterized in that, The coating roller is a rubber roller.

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