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CN-121989435-A - Preparation method and application of one-step formed wiredrawing film

CN121989435ACN 121989435 ACN121989435 ACN 121989435ACN-121989435-A

Abstract

The invention discloses a preparation method and application of a one-step formed wiredrawing film, and relates to the technical field of film production. According to the preparation method of the one-step formed wire drawing film, provided by the invention, the embossing roller with the Shore A hardness of 60-80 degrees and the surface pattern width of 0.05-0.10 mm is selected for calendaring, and meanwhile, various parameters when the casting embossing roller and the cooling roller are matched with each other are adjusted, so that the wire drawing film is successfully prepared through one-step forming, and an excellent embossing effect is achieved.

Inventors

  • CAO GUOHAO
  • ZHENG HAIGUI

Assignees

  • 广东班特斯膜材科技有限公司

Dates

Publication Date
20260508
Application Date
20241108

Claims (10)

  1. 1. The preparation method of the one-step formed wiredrawing film is characterized by comprising the following steps of: The base material is extruded and then cast by casting equipment, and the one-step formed wire drawing film can be prepared after the casting process is finished; The water temperature of the casting embossing roller is 60-80 ℃, the water temperature of the cooling roller is 20-40 ℃, the pressure between any two adjacent embossing rollers and the cooling roller is 50-90 MPa, and the traction speed of the casting is 30-40 m/min; The Shore A hardness of the casting embossing roller is 60-80 degrees, and the pattern width of the surface of the embossing roller is 0.05-0.10 mm.
  2. 2. The method of claim 1, wherein the substrate is one or more of PVC, PE, PP or PET.
  3. 3. The method of claim 1, wherein the casting process further comprises cooling, the cooling being multi-stage cooling.
  4. 4. The method of claim 3, wherein the cooling stages in the multistage cooling are 3 to 5.
  5. 5. The method of claim 3, wherein the temperature difference between any two adjacent stages in the multistage cooling is 5-15 ℃.
  6. 6. The method according to claim 1, wherein the thickness of the one-time-formed drawn film is 80 to 200 μm.
  7. 7. The method of claim 1, wherein the chill roll surface is smooth or frosted.
  8. 8. The method of claim 1, wherein the die temperature during extrusion is 260-280 ℃.
  9. 9. The wiredrawing film is characterized by being prepared by the preparation method of any one of 1-8.
  10. 10. Use of the drawn film of claim 9 for the manufacture of housings for household appliances, packaging materials and housings for digital products.

Description

Preparation method and application of one-step formed wiredrawing film Technical Field The invention relates to the technical field of film production, in particular to a preparation method and application of a one-step formed wire drawing film. Background The drawn film is a film with fine grain texture similar to metal drawn wire formed on the surface of film material through special technological process, and the process gives fine hand feeling to the material. The surface wire drawing process is originally used for manufacturing textures on metal or plastic surfaces, and has been widely applied to digital products such as notebook panels, keyboards, mobile phone rear covers and the like in recent years. In order to further improve the market competitiveness of drawn films and to meet consumer pursuit of aesthetics, film surface embossing is a key post-processing technique. Embossing not only enhances the visual effect of the film, but also improves its practical properties, such as increasing the coefficient of friction and improving breathability. The traditional surface treatment processes include an in-mold insert injection molding method, an in-mold transfer printing technology and an embedded three-dimensional injection molding method, but all the processes need to print textures on a film blank, then perform shape punching, and finally extrude and adhere a film material on the surface of a product. Therefore, the traditional process has the advantages of more production links, low efficiency, long forming period and high manufacturing cost of the wiredrawing film. The prior art discloses a novel production method of a wiredrawing film, namely, a mask (usually a BOPP film) is softened again through heating, wiredrawing patterns are rolled onto the mask by an embossing roller, and then the mask and a base film (usually a PET or PE film) are compounded, but the process links are complex, and the production period is long. In addition, due to the separation of the processes, it is difficult to precisely control the embossing effect, resulting in uneven quality of the finished product. In the existing wire drawing technology, the design and manufacture of the embossing roller are key factors influencing the embossing effect. Embossing rolls are typically made of metal and are used to emboss the film by embossing the surface with a wire pattern. However, the metal embossing roller has a large weight, is not easy to replace and adjust, and may damage the film during the embossing process, affecting the fineness and consistency of the embossing. It is therefore necessary to explore the design parameters of the embossing roll that meet the embossing requirements without damaging the film and the embossing effect. The prior art discloses a PP film with a metal wiredrawing surface and a preparation method thereof, wherein an embossing roller with protrusions with specific shapes, intervals and heights is adopted, and the embossing roller is utilized in a casting device to prepare the film with wiredrawing texture. Although the base film is not provided, the PP film of the metal drawing surface is prepared by designing a special structure of the embossing roller, no relation between the embossing effect and the hardness of the embossing roller and the pattern width is proposed, and the embossing effect is not significantly improved. Therefore, the preparation method and the application of the one-step forming wiredrawing film with excellent embossing effect are developed, and the one-step forming wiredrawing film has important research significance and application value. Disclosure of Invention In order to solve the problem that the embossing effect is not improved in the existing casting production process of the wire drawing film, the primary purpose of the invention is to provide a preparation method of a one-step forming wire drawing film, and the embossing effect of the method is excellent. Still another object of the present invention is to provide a drawn film prepared by the above preparation method. The invention also aims to provide application of the wiredrawing film in preparing home appliance shells, packaging materials and digital product shells. The above object of the present invention is achieved by the following technical scheme: the invention provides a preparation method of a one-step formed wiredrawing film, which comprises the following steps: The base material is extruded and then cast by casting equipment, and the one-step formed wire drawing film can be prepared after the casting process is finished; The water temperature of the casting embossing roller is 60-80 ℃, the water temperature of the cooling roller is 20-40 ℃, the pressure between any two adjacent embossing rollers and the cooling roller is 50-90 MPa, and the traction speed of the casting is 30-40 m/min; The Shore A hardness of the casting embossing roller is 60-80 degrees, and the pattern width of the surface of the embossi