PP film on metal drawn surface and its preparation method

Abstract

The application provides a PP film with a metal-drawing surface and a preparation method thereof. The preparation method comprises the following steps: S1, producing a PP film through a PP flow machine; S2, performing an embossing treatment on the PP film through a metal-drawing embossing roller, wherein the metal-drawing embossing roller comprises a roller shaft body; a plurality of four-pyramid-shaped protruding structures are arranged on the surface of the roller shaft body, the pitch of the four-pyramid-shaped protruding structures is between 1-3 microns, and the height of the four-pyramid-shaped protruding structures is between 34 microns and 36 microns; and S3, performing a cooling setting and a post-treatment on the PP film after the embossing treatment. The PP film with a metal-drawing surface and the preparation method thereof have the advantages that the PP film has a good metal-drawing texture after the embossing treatment, the quality of the product is improved, and the PP film has a good application prospect.

Description

Technical Field

[0001] This invention relates to a PP film on a metal wire drawing surface and its preparation method. Background Technology

[0002] Currently, existing PP packaging bags are quite homogeneous, consisting of either transparent or matte PP materials. To give PP packaging a metallic feel and elevate its perceived quality, a common approach, as described in CN202021699404.1, is to add a brushed base film to the PP composite film, thus imparting a metallic texture. However, this additional brushed base film not only increases costs but also complicates the manufacturing process and requires additional adhesives, among other drawbacks. Summary of the Invention

[0003] This invention provides a PP film on a metal wire drawing surface and its preparation method, which can effectively solve the above-mentioned problems.

[0004] This invention is implemented as follows:

[0005] This invention provides a method for preparing a PP film on a metal wire drawing surface, comprising the following steps:

[0006] S1, PP film is produced by casting using the PP casting machine;

[0007] S2, the PP film is embossed using a metal wire drawing and embossing roller, wherein the metal wire drawing and embossing roller includes a roller shaft body; the surface of the roller shaft body is provided with a plurality of four-sided pyramidal protrusions, the spacing between the four-sided pyramidal protrusions is between 1 and 3 micrometers, and the height of the four-sided pyramidal protrusions is between 34 micrometers and 36 micrometers;

[0008] S3, the embossed PP film is cooled, shaped, and then post-treated.

[0009] The present invention further provides a PP film with a metal wire drawing surface obtained by the above method.

[0010] The beneficial effects of this invention are: the PP film with a brushed metal surface and its preparation method provided by this invention, through embossing treatment, can give the PP film a good brushed metal texture, improve product quality, and have good application prospects. Furthermore, the preparation method of the PP film with a brushed metal surface of this invention is simple and easy to industrialize. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of a device for preparing PP film on a metal wire drawing surface provided in an embodiment of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure of the metal drawing and embossing roller in the apparatus for preparing PP film with a metal drawing surface provided in an embodiment of the present invention.

[0014] Figure 3 This is a magnified schematic diagram of a partial structure of the metal drawing and embossing roller in an apparatus for preparing a PP film with a metal drawing surface, according to an embodiment of the present invention.

[0015] Figure 4 This is a photograph of the metal brushing and embossing roller in an apparatus for preparing a PP film with a brushed metal surface, according to an embodiment of the present invention.

[0016] Figure 5 This is a flowchart of a method for preparing a PP film on a metal wire drawing surface according to an embodiment of the present invention.

[0017] Figure 6 This is a photograph of a PP film with a brushed metal surface provided in an embodiment of the present invention.

[0018] Figure 7 This is a photograph of a PP film with a brushed metal surface provided in another embodiment of the present invention.

[0019] Figure 8 This is a photograph of a PP film with a brushed metal surface provided by the present invention as a comparative example.

[0020] Figure 9 This is a photograph of a PP film with a brushed metal surface, provided as another comparative example of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Reference Figure 1 As shown, this embodiment of the invention provides a PP film preparation apparatus 100 with a metal-brushed surface, including a PP casting system 20 and a metal-brushed embossing roller 10. The PP casting system 20 includes a PP casting machine 21 and a coating and winding device 22; the metal-brushed embossing roller 10 is disposed between the PP casting machine 21 and the coating and winding device 22. The metal-brushed embossing roller 10 is used to first perform metal-brushed embossing on the PP film cast from the PP casting machine 21, and then perform coating, corona treatment, winding, printing, and other processes, so that the final PP film has a metal-brushed surface.

[0023] The PP casting machine 21 and the coating and winding device 22 are both existing technologies and can be selected according to actual needs, so they will not be described in detail here.

[0024] Please see Figure 2-4As shown, the metal brushed embossing roller 10 includes a roller body 12 and support shafts 11 disposed at both ends of the roller body 12. The surface of the roller body 12 is provided with a plurality of pyramidal protrusions 13. The spacing between the pyramidal protrusions 13 is between 1 and 3 micrometers; in one embodiment, the spacing is approximately 2 micrometers. The height of the pyramidal protrusions 13 is between 34 and 36 micrometers. The height of the pyramidal protrusions 13 determines the effect of the metal brushed embossing after subsequent embossing. Experiments have shown that if the height of the pyramidal protrusions 13 is less than 34 micrometers, the metallic texture does not achieve the expected effect; while if the height of the pyramidal protrusions 13 is greater than 35 micrometers, conventional electro-engraving processes cannot achieve the desired result, and laser engraving would be costly. In one embodiment, the height of the pyramidal protrusions 13 is approximately 35 micrometers, and it is formed by laser engraving. The side length of the pyramidal protrusion 13 is between 0.5cm and 2cm, preferably between 0.8cm and 1.5cm. In one embodiment, the side length of the pyramidal protrusion 13 is approximately 1cm.

[0025] The length of the roller body 12 is not limited and can be selected according to actual needs. In one embodiment, the length of the roller body 12 is 2440mm. The length of the metal wire drawing and embossing roller 10 can also be selected according to actual needs. In one embodiment, the length of the metal wire drawing and embossing roller 10 is 3000mm.

[0026] Please see Figure 5 As shown, this embodiment of the invention further provides a method for preparing a PP film on a metal wire drawing surface, comprising the following steps:

[0027] S1, PP film is produced by casting using the PP casting machine 21;

[0028] S2, the PP film is embossed using the metal wire drawing and embossing roller 10;

[0029] S3, the embossed PP film is cooled and shaped and subjected to other post-processing.

[0030] In step S1, the PP casting machine 21 is a mature existing technology for casting PP film, which will not be described in detail here.

[0031] In step S2, in this invention, by using techniques such as laser engraving, a pyramidal protrusion 13 with a height of approximately 35 micrometers can be obtained. This creates a good embossing effect, giving the final product a brushed metallic texture. In other comparative examples, ordinary electro-engraving can only create a pyramidal protrusion 13 with a height of approximately 30 micrometers, or locally reaching 35 micrometers, which cannot create an embossing effect, thus the final product lacks a brushed metallic texture.

[0032] In step S3, the steps after embossing, including cooling, corona treatment, winding, and printing, are existing technologies and can be selected according to actual needs, and will not be elaborated here.

[0033] Please see Figure 6-7 As shown, this embodiment of the invention further provides a PP film with a metal wire drawing surface obtained by the above method.

[0034] Please see Figure 8-9 The PP film described above, prepared by embossing a pyramidal protrusion 13 with a height of approximately 30 micrometers, is provided as a comparative example of the present invention and clearly lacks the texture of a metallic wire drawing.

[0035] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a PP film on a metal wire drawing surface, characterized in that, Includes the following steps: S1, PP film is produced by casting using a PP casting machine; S2, the PP film is embossed using a metal wire drawing and embossing roller, wherein the metal wire drawing and embossing roller includes a roller shaft body; the surface of the roller shaft body is provided with a plurality of quadrangular pyramidal protrusions, the spacing between the quadrangular pyramidal protrusions is between 1 and 3 micrometers, the height of the quadrangular pyramidal protrusions is between 34 micrometers and 36 micrometers, and the side length of the quadrangular pyramidal protrusions (13) is between 0.8cm and 1.5cm; S3, the embossed PP film is cooled, shaped, and then post-treated.

2. The method for preparing PP film on a metal wire drawing surface as described in claim 1, characterized in that, The spacing between the pyramidal protrusions is 2 micrometers.

3. The method for preparing PP film on a metal wire drawing surface as described in claim 1, characterized in that, The height of the pyramidal protrusion is 35 micrometers.

4. The method for preparing PP film on a metal wire drawing surface as described in claim 1, characterized in that, The metal brushed embossing roller is formed by laser engraving.

5. A PP film with a brushed metal surface, characterized in that, The PP film on the metal wire drawing surface is obtained by the method described in any one of claims 1-4.

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