A cast film matte roll

Abstract

The utility model provides a kind of cast film matte roller, including roller body, surface functional layer and cooling device being arranged in the inner cavity of the roller body, the surface functional layer is arranged in the outer surface of the roller body, the outer surface of the surface functional layer is uniformly provided with multiple micron-level recesses, the micron-level recess is provided with multiple upward extending protrusions in;Regular micron-level recess is manufactured on roller face, which is used to control macroscopic haze, and multiple protrusions extending upward are provided on the surface of micron-level recess, which makes certain pinning effect of polymer melt in contact instant, ensures good heat conduction and shaping, but after cooling shrinkage, the peeling force is far less than existing cast film matte roller, in addition, the setting of low surface energy coating can greatly reduce interfacial adhesion, which makes molten film extremely smoothly peeled after cooling and setting.

Description

Technical Field

[0001] This utility model relates to the technical field of cast film production equipment, specifically to a cast film matte roller. Background Technology

[0002] The matte roller for cast film, also known as the frosted roller or sanding roller, is a crucial core component in the cast film production line. It is typically installed in the cooling roller unit, and its core function is to rapidly cool and replicate a specific micro-rough structure on the surface of the molten polymer by contacting it with the surface of the cast film, thereby producing a low-gloss matte or sanding effect on the surface of the cast film.

[0003] In existing technologies, during the casting process, molten polymers tend to adhere to the roller surface (especially in formulations containing opening agents and slip agents), leading to defects on the film surface (such as fisheyes and scratches). This necessitates frequent shutdowns to clean the rollers, impacting production capacity. Utility Model Content

[0004] In view of the defects existing in the prior art, the purpose of this utility model is to provide a cast film matte roller to solve the problem that molten polymer easily adheres to the roller surface during the processing of existing cast film matte rollers, which leads to defects on the film surface.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This application provides a cast film matte roller, including a roller body, a surface functional layer, and a cooling device disposed in the inner cavity of the roller body. The surface functional layer is disposed on the outer surface of the roller body, and a plurality of micron-sized depressions are uniformly disposed on the outer surface of the surface functional layer. A plurality of upwardly extending protrusions are disposed in the micron-sized depressions.

[0007] Furthermore, the outer surface of the micron-sized recess is coated with a low surface functional coating.

[0008] Furthermore, the low surface functional coating is a fluorinated silane or a Teflon coating.

[0009] Furthermore, the cooling device includes a water inlet at one end of the roller body, a water outlet at the other end of the roller body, and a spiral channel formed on the outer surface of the roller body, wherein the water inlet and the water outlet are respectively connected to the two ends of the spiral channel.

[0010] Furthermore, the micron-level recesses are formed by laser engraving or micro-electrical discharge machining.

[0011] Beneficial effects:

[0012] This embodiment employs the aforementioned cast film matte roller, utilizing regular micron-level depressions created on the roller surface to control macroscopic haze. Multiple upward-extending protrusions are provided on the surface of the micron-level depressions, which causes a certain pinning effect in the polymer melt upon contact, ensuring good heat conduction and molding. However, after cooling and shrinkage, the peeling force is much smaller than that of existing cast film matte rollers. In addition, the low surface energy coating greatly reduces interfacial adhesion, allowing the molten film to peel off extremely smoothly after cooling and setting. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the cast film matte roller in the embodiments of this application.

[0014] Figure 2 This is a three-dimensional structural diagram of the roller body in the embodiments of this application.

[0015] Figure 3 for Figure 1 A magnified schematic diagram of the structure at point A in the diagram.

[0016] Figure 4 for Figure 2 A magnified schematic diagram of the structure at point B in the diagram.

[0017] In the picture:

[0018] 100-Cast film matte roller;

[0019] 10-Roller body; 11-Spiral channel;

[0020] 20 - Surface functional layer;

[0021] 30-micron level depressions;

[0022] 40 - Protrusion. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] See appendix Figures 1 to 4 As shown, this embodiment provides a cast film matte roller 100, including a roller body 10, a surface functional layer 20, and a cooling device disposed in the inner cavity of the roller body 10. The cooling device is used to cool the outer surface of the roller body 10. The surface functional layer 20 is disposed on the outer surface of the roller body 10 and is used to contact the film.

[0025] In this embodiment, a plurality of micron-sized recesses 30 are uniformly disposed on the outer surface of the surface functional layer 20, and a plurality of upwardly extending protrusions 40 are disposed within the micron-sized recesses 30. That is, a secondary structure is formed on the outer surface of the surface functional layer 20, with the plurality of micron-sized recesses 30 constituting the first-level structure and the nano-sized protrusions 40 constituting the second-level structure. The micron-sized recesses 30 are created by laser engraving or micro-electrical discharge machining to produce regular micron-sized concave circular pits on the outer surface of the surface functional layer 20, namely the micron-sized recesses 30 in this embodiment. Subsequently, the bottom outer surface of the micron-sized recesses 30 is anodized (if an aluminum roller), chemically etched, or plasma-treated to form nano-sized upwardly extending cylindrical protrusions 40.

[0026] By constructing micro-nano secondary structures (micron-level recesses 30 and protrusions 40) in the functional surface layer, the actual contact area between the polymer melt and the roller surface is reduced, thereby reducing the adhesion force of the molten film on the roller surface and facilitating subsequent peeling.

[0027] In this embodiment, the outer surface of the micron-sized recess 30 is coated with a low surface functional coating. That is, a low surface energy consumption material, such as a fluorinated silane or Teflon coating, is firmly coated on the surface of the overall micro / nano secondary structure through physical vapor deposition or sol-gel method. The low surface functional coating can further reduce the interfacial adhesion of the molten film.

[0028] Reference Figure 2 and Figure 4 As shown, in this embodiment, the cooling device includes a water inlet at one end of the roller body 10, a water outlet at the other end of the roller body 10, and a spiral channel 11 formed on the outer surface of the roller body 10. The water inlet and the water outlet are respectively connected to the two ends of the spiral channel 11.

[0029] During use, external cooling water flows into the inner cavity of the roller body 10 through the inlet. The cooling water entering the inner cavity of the roller body 10 enters the spiral channel 11 on the outer surface of the roller body 10 through the internal water flow channel. The cooling water flows along the spiral channel 11, from one end of the roller body 10 to the other end, and flows out from the outlet of the roller body 10, thereby cooling the outer surface of the roller body 10.

[0030] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A cast film matte roll characterized in that, The device includes a roller body, a surface functional layer, and a cooling device disposed in the inner cavity of the roller body. The surface functional layer is disposed on the outer surface of the roller body, and the outer surface of the surface functional layer is uniformly provided with a plurality of micron-sized recesses, and the micron-sized recesses are provided with a plurality of upwardly extending protrusions.

2. A cast film matte roll according to claim 1 wherein, The outer surface of the micron-sized recess is coated with a low surface functional coating.

3. A cast film matt roll according to claim 2, wherein The low surface functional coating is a fluorinated silane or a Teflon coating.

4. A cast film matte roll according to claim 1 wherein, The cooling device includes a water inlet at one end of the roller body, a water outlet at the other end of the roller body, and a spiral channel formed on the outer surface of the roller body. The water inlet and the water outlet are respectively connected to the two ends of the spiral channel.

5. A cast film matte roll according to claim 1 wherein, The micron-level recesses are formed by laser engraving or micro-electrical discharge machining.

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