A High-Efficiency PVC Film Winding Method

Abstract

This invention relates to the field of PVC film processing technology, specifically disclosing a high-efficiency PVC film winding method, comprising the following steps: applying adhesive to a first paper core; activating the material storage function, pausing the winding machine, removing the already wound second paper core from the winding station, and installing the adhesive-coated first paper core into the winding station; cutting the material, jogging the winding machine, and stopping the jogging after the film is rolled onto the first paper core; manually smoothing the PVC film, completing the splicing, closing the material storage function, and starting the winding machine to begin normal winding. This invention, by applying adhesive to the paper core and starting splicing before the adhesive dries, ensures the smoothness of the paper core surface due to the smooth surface of the adhesive, and the adhesive acts as a lubricant between the PVC film and the paper core layer, reducing the sliding friction coefficient between the interfaces, allowing the PVC film to slide freely under low tension; during the splicing process, the PVC film can be smoothed by manual smoothing, avoiding wrinkles and uneven marks, and improving the utilization rate of the finished product.

Description

Technical Field

[0001] This invention relates to the field of PVC film processing technology, and in particular to a high-efficiency PVC film winding method. Background Technology

[0002] Flexible PVC film rolls are increasingly in demand for windows used in applications such as off-road vehicles, yachts, and tents due to their lightweight, cost-effectiveness, impact resistance, high transparency, high light transmittance, and adaptability to high and low temperature environments. These products are typically smooth on both sides, with thicknesses ranging from 300µm to 1500µm. To avoid interlayer air entrapment during film winding, a high-temperature, high-pressure winding method at 50–80℃ is often used. Furthermore, to ensure clean cuts during splicing, manufacturers often use a storage rack for machine-stopped splicing. Traditional methods involve applying adhesive tape to the paper core or using a highly smooth plastic core to complete the splicing process.

[0003] Because flexible PVC film is smooth on both sides, it is difficult to automatically wind onto paper cores (including specially polished paper cores) when using paper cores for roll changing and splicing. Currently, most manufacturers wrap smooth transparent plastic tape around its surface to reduce the surface roughness of the contact core layer. Theoretically, a smooth plastic core and a paper core wrapped with plastic tape are similar and easy to splice, but such plastic cores are expensive and therefore abandoned by manufacturers. During roll changing, under pressure, the flexible film is pressed against the smooth core, and due to the low coefficient of friction between the interfaces, the film wraps around the paper core to complete the splicing process. However, the tape is wrapped manually, and micro-wrinkles and splicing joints are inevitable during the process. Microscopically speaking, the surface is uneven. When the flexible film is squeezed, uneven marks will be imprinted on the product near the core. At the same time, whether it is a paper core wrapped with transparent plastic tape or a plastic core, the adhesion between the plastic and the PVC film is large and the sliding friction is small. Once the film comes into contact with the core, it is fixed and difficult to slide and flatten, resulting in wrinkles. Wrinkles and uneven tape marks create a memory on PVC macromolecules, which are difficult for downstream customers to remove during use, resulting in defective products and forcing them to scrap the core products. Summary of the Invention

[0004] The technical problem to be solved by this invention is: how to avoid wrinkles caused by the inability to flatten the soft PVC film during splicing, or imprints caused by uneven adhesive tape on the soft PVC film, thereby reducing the scrap rate during the use of the film.

[0005] To address the aforementioned technical problems, this invention provides a highly efficient PVC film winding method, comprising the following steps:

[0006] S1: Apply glue to the first paper core;

[0007] S2: Start the material storage function, pause the winding machine, take out the second paper core that has been wound from the winding station, and install the glued first paper core into the winding station;

[0008] S3: Cut the material, jog the rewinder, and stop jogging after the film is changed to the first paper core;

[0009] S4: Manually smooth the PVC film, splicing complete, turn off the material storage function, and start the rewinder to begin normal winding.

[0010] More preferably, in step S1, the step of applying adhesive to the first paper core includes:

[0011] A soft brush is used to apply water-based pseudoplastic liquid adhesive to the outer wall of the first paper core along the length of the first paper core.

[0012] More preferably, the viscosity of the water-based pseudoplastic liquid adhesive at 25°C is 50–200 cps.

[0013] More preferably, the coating thickness is 20–30 μm.

[0014] More preferably, the adhesive coating width is 5 to 20 cm.

[0015] More preferably, the adhesive coating length is 4 to 16 cm shorter than the length of the first paper core.

[0016] More preferably, the winding temperature is 45–80°C.

[0017] More preferably, the winding speed is 5 to 50 mpm.

[0018] More preferably, the winding pressure is 2 to 10 MPa.

[0019] More preferably, the PVC film has a roll length of 20-1000m / roll on the first paper core.

[0020] Compared with existing technologies, the efficient PVC film winding method provided by this invention has the following advantages: This invention applies adhesive to the paper core and begins splicing while the adhesive is still wet. Because the adhesive surface is smooth, it ensures the smoothness of the paper core surface. Furthermore, the adhesive acts as a lubricant between the PVC film and the paper core layer, reducing the coefficient of sliding friction at the interface, allowing the PVC film to slide freely under low tension. During splicing, the PVC film can be flattened by hand, avoiding wrinkles and uneven marks, thus improving the usability of the finished product. Moreover, due to high-temperature winding, the adhesive dries completely after splicing, without affecting the use of the finished product, improving economic efficiency, reducing energy consumption, and protecting the environment. In addition, the use of water-based adhesive coating reduces the cumbersome tape wrapping process, making it easier to change and splice soft, smooth-sided products, and eliminating core marks caused by previous splicing, thereby improving the film's usability. Attached Figure Description

[0021] Figure 1 This is a flowchart illustrating the steps of an efficient PVC film winding method described in this invention. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0023] In the description of this invention, it should be understood that the orientation or positional relationship indicated by terms such as "outer wall" and "inner diameter" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection via an intermediate medium; or a connection within two components. Those skilled in the art will understand the specific meaning of these terms in this invention based on the specific circumstances.

[0025] like Figure 1 As shown, a preferred embodiment of the present invention provides a method for high-efficiency PVC film winding, comprising the following steps:

[0026] S1: Apply glue to the first paper core;

[0027] S2: Start the material storage function, pause the winding machine, take out the second paper core that has been wound from the winding station, and install the glued first paper core into the winding station;

[0028] S3: Cut the material, jog the rewinder, and stop jogging after the film is changed to the first paper core;

[0029] S4: Manually smooth the PVC film, splicing complete, turn off the material storage function, and start the rewinder to begin normal winding.

[0030] In the above example, to ensure the efficiency of PVC film winding during gluing and winding, at least two winding rollers need to be used alternately. The first and second paper cores are respectively fitted onto different winding rollers for easy roll changing. By applying glue to the first and second paper cores and starting splicing before the glue dries, the smooth surface of the glue ensures the smoothness of the paper core surface. The glue also acts as a lubricant between the PVC film and the paper core layer, reducing the sliding friction coefficient between the interfaces, allowing the PVC film to slide freely under low tension. During the splicing process, the PVC film can be flattened by manually smoothing it, avoiding wrinkles and uneven marks, and improving the utilization rate of the finished product. Moreover, due to the high-temperature winding, the glue can dry completely after splicing, without affecting the use of the finished product. This not only improves economic efficiency but also reduces energy consumption and protects the environment.

[0031] In some examples of the present invention, the step of applying adhesive to the first paper core in step S1 includes: applying water-based pseudoplastic liquid adhesive to the outer wall of the first paper core along the length of the first paper core using a soft brush; using water-based adhesive coating not only reduces the complicated tape wrapping process, making it easier to rewind and splice soft, smooth products, but also eliminates the core imprints caused by previous splicing, further improving the utilization rate of the film.

[0032] In some examples of the present invention, the viscosity of the water-based pseudoplastic liquid adhesive at 25°C is 50–200 cps.

[0033] In some examples of the present invention, the adhesive coating thickness is 20–30 μm.

[0034] In some examples of this invention, the adhesive application width is 5 to 20 cm.

[0035] In some examples of the present invention, the adhesive coating length is 4 to 16 cm shorter than the length of the first paper core.

[0036] The working process of this invention is as follows: A water-based pseudoplastic liquid adhesive is used, and its viscosity is adjusted to 50-200 cps at 25°C. After the second paper core is wound on the winding machine, before changing the roll, the first paper core is attached to the winding roller. Then, a soft brush with a width of 8cm is manually used to apply adhesive along the length of the first paper core, resulting in a wet adhesive thickness of approximately 20-30µm and a width of 6-10cm. The adhesive application length is 2-4cm shorter at both ends than the paper core ends. Note that if a larger diameter paper core is used, the adhesive layer width can be increased to 20cm to ensure proper splicing. The adhesive layer should not be too thick during application; otherwise, the solvent water will not diffuse in time, causing adhesive to drip or be squeezed out during smoothing, contaminating the film.

[0037] Mount the first coated paper core along with the winding roller onto the winding machine, start the storage rack, stop the winding machine from rotating, and bring the coated tape close to the splice. After cutting the material, jog the winding machine to roll the film onto the first paper core, stop jogging, smooth the PVC film by hand, start the winding machine, and begin production.

[0038] Because the adhesive layer is thin, it can dry quickly during the pressure winding process at 45-80℃ without affecting product quality or subsequent use.

[0039] To ensure the quality of winding, this example preferably uses a winding speed of 5–50 mpm, a winding pressure of 2–10 MPa, and a roll length of 20–1000 m / roll for the PVC film on the first paper core.

[0040] In summary, this invention provides a highly efficient PVC film winding method. By applying adhesive to the paper core and starting splicing before the adhesive dries, the smooth surface of the adhesive ensures the smoothness of the paper core. Furthermore, the adhesive acts as a lubricant between the PVC film and the paper core layer, reducing the coefficient of sliding friction at the interface, allowing the PVC film to slide freely under low tension. During splicing, the PVC film can be easily flattened by hand, avoiding wrinkles and uneven marks, thus improving the usability of the finished product. Moreover, due to high-temperature winding, the adhesive dries completely after splicing, without affecting the use of the finished product, improving economic efficiency, reducing energy consumption, and protecting the environment. In addition, the use of a water-based adhesive coating reduces the cumbersome tape wrapping process, making it easier to change and splice soft, smooth-sided products, and eliminating core marks caused by previous splicing, thereby improving the film's usability.

[0041] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention. The basic principles, main features, and advantages of the present invention have been shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalents of the claims be included within the present invention.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for efficiently winding PVC film, characterized in that, Includes the following steps: S1: Apply glue to the first paper core; A soft-bristled brush is used to apply water-based pseudoplastic liquid adhesive to the outer wall of the first paper core along the length of the first paper core; the viscosity of the water-based pseudoplastic liquid adhesive at 25°C is 50-200 cps. S2: Start the material storage function, pause the winding machine, take out the second paper core that has been wound from the winding station, and install the glued first paper core into the winding station; S3: Cut the material, jog the rewinder, and stop jogging after the film is changed to the first paper core; S4: Manually smooth the PVC film, splicing is complete, turn off the material storage function, and start the rewinder to begin normal winding; The winding temperature is 45–80°C.

2. The efficient PVC film winding method according to claim 1, characterized in that, The coating thickness is 20-30 μm.

3. The efficient PVC film winding method according to claim 1, characterized in that, The adhesive application width is 5–20 cm.

4. The efficient PVC film winding method according to claim 1, characterized in that, The length of the adhesive coating is 4 to 16 cm shorter than the length of the first paper core.

5. The efficient PVC film winding method according to claim 1, characterized in that, The winding speed is 5–50 mpm.

6. The efficient PVC film winding method according to claim 1, characterized in that, The winding pressure is 2-10 MPa.

7. The efficient PVC film winding method according to claim 1, characterized in that, The PVC film is rolled to a length of 20-1000m on the first paper core.

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