High-temperature-resistant anti-warping printable explosion-proof membrane

Abstract

The invention provides a high-temperature-resistant anti-warping printable explosion-proof membrane, and relates to the field of explosion-proof membranes. The high-temperature-resistant anti-warping printable explosion-proof film sequentially comprises a first layer, a second layer and a third layer from top to bottom, wherein the first layer is a PP or PE or CPP protective film with the thickness of 0.02-0.05 mm, adopts an electrostatic adsorption protective film and is used for protecting the surface of a base material from being scratched and smudged, and the subsequent electroplating printing process is not influenced; and the second layer is PET or PC or TPU or PMMA with the thickness of 0.012-0.036 mm, and is made of optical-grade polyester (the PET is subjected to prime coat treatment on the surface), polymethyl methacrylate (PMMA) and TPU. According to the high-temperature-resistant anti-warping printable explosion-proof film, a layer of thin material is additionally arranged on the bottom layer, reverse shrinkage can be achieved during high-temperature baking, the shrinkage force of the base material is counteracted, the flatness of the whole product after baking is achieved, the thin film material is utilized, reverse shrinkage is achieved, a customer tears off the PP protective film layer in the using process, and the processes of wire drawing, electroplating, silk screening and the like are conducted on the surface of the base material, so that the anti-warping printable explosion-proof film is obtained. And the phenomenon of serious warping towards a processing layer does not occur in a high-temperature baking process of 85 DEG C.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof film technology, specifically to a high-temperature resistant and warp-resistant printable explosion-proof film. Background Technology

[0002] With the rapid development of electronics, people have increasingly higher requirements for product appearance, especially for the patterns and colors of mobile phone back covers. Currently, most mobile phone back cover manufacturers still use the following process: UV stripe transfer printing on a transparent explosion-proof film surface, followed by electroplating on the UV stripe texture, screen printing various colors on the electroplated layer, and finally sealing with a black base layer and baking the ink to cure. At this point, an explosion-proof film with a vibrant pattern is successfully produced. Then, the large sheet is cut into mobile phone-sized pieces, the release liner is removed, and it is glued to a glass or PC back cover with adhesive. The resulting mobile phone back cover displays a vibrant pattern, which is then assembled into the phone by the manufacturer, making it very popular with consumers. Due to the continuous demand for thinner and lighter products, manufacturers are also requiring thinner explosion-proof films for glass back covers. The thickness of the explosion-proof film substrate has changed from the original 0.075mm or 0.05mm to 0.025mm. At this point, after completing the above processes, during the baking and curing of the ink, due to the thin substrate and high shrinkage rate at high temperatures, the explosion-proof film will warp towards the printed surface. This directly affects the subsequent cutting and bonding processes. The customer uses sheet processing, with dimensions of 400mm*320mm, and after the entire sheet is completed, six smaller pieces the size of a mobile phone back cover need to be cut. First, the first protective film is removed, then UV transfer adhesive is applied to the second layer, followed by electroplating and several color printing layers. Each printing layer is baked at 85℃ for 15 minutes. After several printing layers are completed, it is baked again at 85℃ for 90 minutes. Then it is cut into small pieces, the release film is removed, and it is bonded to the glass back cover. After printing and baking, when the product cools down after being removed from the oven, it exhibits severe warping towards the printed surface (warping height exceeding 30mm), which affects the subsequent cutting and bonding processes. Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant, warp-resistant, printable explosion-proof film, which solves the problems mentioned in the background art.

[0004] Technical solution

[0005] To achieve the above objectives, the present invention provides the following technical solution: a high-temperature resistant, anti-warping, printable explosion-proof film, comprising, from top to bottom:

[0006] First layer: 0.02-0.05mm thick PP, PE or CPP protective film, using electrostatic adsorption protective film, to protect the substrate surface from scratches and dirt, and not affect the subsequent electroplating and printing processes.

[0007] The second layer is a 0.012-0.036mm thick PET, PC, TPU, or PMMA material, made of one or more of the following: optical grade polyester (PET with a primer coating), polymethyl methacrylate (PMMA), and TPU.

[0008] The third layer: a 0.01-0.05mm thick OCA adhesive layer, made with imported Japanese resin and formulated by Xuanlang, is used to ensure adhesion between the product and the phone's glass back cover during use.

[0009] The fourth layer is a 0.125-0.036mm thick PET release film, which provides sufficient support and rigidity to prevent deformation of the second PET layer during the electroplating and screen printing process.

[0010] Fifth layer: 0.005mm-0.01mm thick OCA adhesive, used to bond the fourth layer release film and the sixth layer film, to provide good adhesion between the two films;

[0011] The sixth layer is 0.012-0.38mm thick PET, which is used to prevent significant shrinkage and warping during high-temperature baking.

[0012] Furthermore, the production process includes: Step 1: The fourth layer of the release film, selected from domestic or foreign PET film materials, is placed on the second roll of the coating machine with the release surface facing upwards. The second layer of the substrate, selected from domestic or foreign optical grade film materials with a primer, is placed on the first roll of the coating line. A 0.025mm thick third layer of acrylic adhesive is applied to the surface of the second layer of the substrate. The adhesive solvent is dried in an oven at a high temperature of 60℃ to 105℃. After the adhesive has cured, the release surface of the fourth layer of the release film placed on the second roll is laminated. At this point, the release surfaces of the second and fourth layers of the product are tightly bonded together by the third layer of adhesive, referred to as semi-finished product A.

[0013] Further, in step two: the semi-finished product A mentioned above is placed on the second roll of the coating machine, and the sixth layer, selected from domestic 0.025mm thick PET, is placed on the first roll of the coating machine. The fifth layer of OCA adhesive is applied to the surface of the PET. The adhesive solvent is dried in an oven at 60℃ to 105℃. After the adhesive is cured, the fourth layer of the second-layer semi-finished product A is laminated to the back, referred to as semi-finished product B.

[0014] Furthermore, in step three: the adhesive side of the PP protective film is laminated onto the substrate surface of the semi-finished product B and the first layer of PP protective film using a laminating machine, and then wound up. At this point, the entire high-temperature resistant and anti-curling product is completed.

[0015] This invention provides a high-temperature resistant, warp-resistant, printable explosion-proof film. It has the following beneficial effects:

[0016] This high-temperature resistant, anti-warping, printable explosion-proof film uses a thinner layer added to the bottom layer. During high-temperature baking, it shrinks in the opposite direction, offsetting the shrinkage force of the substrate to achieve the flatness of the entire product after baking. By using a thin film material that shrinks in the opposite direction, customers can peel off the PP protective film layer and perform processes such as wire drawing, electroplating, and screen printing on the substrate surface. During the 85℃ high-temperature baking process, there will be no serious warping of the processed layer. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of semi-finished product A of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of semi-finished product B of the present invention;

[0020] Figure 4 This is a schematic diagram of the finished product structure of the present invention. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] like Figure 1-4 As shown, this embodiment of the invention provides a high-temperature resistant, warp-resistant, printable explosion-proof film, comprising, from top to bottom:

[0026] First layer: 0.02-0.05mm thick PP, PE or CPP protective film, using electrostatic adsorption protective film, to protect the substrate surface from scratches and dirt, and not affect the subsequent electroplating and printing processes.

[0027] The second layer is a 0.012-0.036mm thick PET, PC, TPU, or PMMA material, made of one or more of the following: optical grade polyester (PET with a primer coating), polymethyl methacrylate (PMMA), and TPU.

[0028] The third layer: a 0.01-0.05mm thick OCA adhesive layer, made with imported Japanese resin and formulated by Xuanlang, is used to ensure adhesion between the product and the phone's glass back cover during use.

[0029] The fourth layer is a 0.125-0.036mm thick PET release film, which provides sufficient support and rigidity to prevent deformation of the second PET layer during the electroplating and screen printing process.

[0030] Fifth layer: 0.005mm-0.01mm thick OCA adhesive, used to bond the fourth layer release film and the sixth layer film, to provide good adhesion between the two films;

[0031] The sixth layer is 0.012-0.38mm thick PET, which is used to prevent significant shrinkage and warping during high-temperature baking.

[0032] The production process includes: Step 1: The fourth layer of release film, selected from domestic or foreign PET film material, is placed on the second roll of the coating machine with the release side facing up. The second layer of substrate, selected from domestic or foreign optical grade film material with primer, is placed on the first roll of the coating line. A 0.025mm thick third layer of acrylic adhesive is coated on the surface of the second layer of substrate. The adhesive solvent is dried in an oven at a high temperature of 60℃ to 105℃. After the adhesive is cured, the release side of the fourth layer of release film placed on the second roll is laminated. At this time, the release sides of the second and fourth layers of the product are tightly bonded together by the third layer of adhesive. This is referred to as semi-finished product A.

[0033] Step 2: Place the semi-finished product A on the second roll of the coating machine. Place the sixth layer, 0.025mm thick PET (domestic grade), on the first roll of the coating machine. Apply the fifth layer of OCA adhesive to the PET surface. Dry the adhesive solvent in an oven at 60℃ to 105℃. After the adhesive has cured, laminate the back of the fourth layer of the semi-finished product A, referred to as semi-finished product B.

[0034] Step 3: Using a laminating machine, the adhesive side of the PP protective film is laminated onto the substrate surface of the semi-finished product B and the first layer of PP protective film. The product is then rolled up. At this point, the entire high-temperature resistant and anti-warping product is complete. Because a thin film material is added to the bottom layer, this product shrinks in the reverse direction. When using the product, the customer can peel off the PP protective film layer and perform processes such as wire drawing, electroplating, and screen printing on the substrate surface. During the 85℃ high-temperature baking process, there will be no serious warping of the processed layer.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant, warp resistant, printable, explosion-proof membrane, characterized in that: From top to bottom in turn includes: The first layer: 0.02-0.05mm thick PP or PE or CPP protective film, select electrostatic adsorption protective film, for protecting the surface of the substrate from being scratched, not dirty, not affect the subsequent electroplating printing process; The second layer: 0.012-0.036mm thick PET or PC or TPU or PMMA, using optical grade polyester (PET, surface with primer treatment), polymethyl methacrylate (PMMA), TPU, one or more materials; The third layer: 0.01-0.05mm thick OCA glue layer, select Japan imported ester, xuanlang preparation synthesis, for the product in use and the adhesive force between the mobile phone glass back cover: The fourth layer: 0.125-0.036mm thick PET isolation film, for having enough support force, enough to support the second layer of PET to be deformed in the electroplating silk screen process; The fifth layer: 0.005mm-0.01mm thick OCA glue, for bonding the fourth layer of isolation film and the sixth layer of film, for providing good bonding of two layers of film; The sixth layer: 0.012-0.38mm thick PET, for the occurrence of large shrinkage when high temperature baking, warping to this side.

2. A high temperature resistant, warp resistant, printable, explosion-proof membrane according to claim 1, characterized in that: The production process Including: process one: the fourth layer of isolation film, select domestic or foreign PET film material, placed on the second put on the coating machine roll shaft, isolation surface upward, the second layer of substrate, select domestic or foreign optical grade film material with primer, placed on the coating line of one put on the roll shaft, coated with 0.025mm thick third layer of acrylic adhesive layer on the surface of the second layer of substrate, through the oven 60℃ to 105℃ high temperature, the glue solvent drying, after the glue solidification, composite above placed in the second layer of the fourth layer of isolation film isolation surface, at this time the second layer of product and the fourth layer of isolation surface, through the third layer of adhesive, has been closely composite together, referred to as semi-finished product A.

3. A high temperature resistant, warp resistant, printable, explosion-proof membrane according to claim 2, characterized in that: Process two: the above-mentioned semi-finished product A, placed on the second put on the coating machine roll shaft, the sixth layer, select domestic 0.025mm thick PET, placed on the coating machine on the roll, coated with the fifth layer of OCA glue on the surface of PET, through 60℃ to 105℃ oven to dry the glue solvent, after the glue solidification, composite the fourth layer of the back of semi-finished product A, referred to as semi-finished product B.

4. A high temperature resistant, warp resistant, printable, explosion-proof membrane according to claim 3, characterized in that: Process three: the above-mentioned semi-finished product B and the first layer of PP protective film, the adhesive surface of PP protective film is composite in the substrate surface of semi-finished product B by laminating machine, and winding at this time, the whole product is completed.

Images