CN201234412Y - Plastic rubber case and mobile phone adopting the plastic rubber case - Google Patents

Abstract

The utility model provides a plastic shell and a mobile phone using the plastic shell. The plastic shell includes a base material and a transparent film layer on the surface of the base material. It is characterized in that the plastic shell also includes The metal film layer is located between the substrate surface and the transparent film layer. The product with this structure has a metal film layer on the surface of the product base material, and a transparent film layer is protected outside the metal film layer, so that the product has a metallic texture and a high-bright metallic luster, and is more abrasion-resistant and of high quality. It is more reliable and improves the quality and grade of the product.

Description

A plastic casing and a mobile phone using the plastic casing

technical field

The utility model relates to a plastic shell and a mobile phone using the plastic shell.

Background technique

The casings of current electronic products such as mobile phones, computers, mp3s, etc. are usually made of plastic products. In order to obtain a high-quality pattern or color appearance for the shell, the industry often uses the in-mold insert molding (IML) process to process the electronic product shell. This process is to put the printed sheet into the mold Injection molding is performed, in which the flakes are combined with molten plastic particles to form the finished product. The characteristics of the products produced by this process are: the surface of the product substrate is covered with a layer of hardened transparent film, and the inner surface of the transparent film is printed with an ink pattern layer, so that the ink is protected by a film, which can prevent the ink from being scratched and make the product durable. Friction, and can keep the color bright and not easy to fade for a long time.

Although the quality of IML products is excellent, the form is beautiful. However, its pattern is limited to the color of the ink itself, and after the loss of the transparent substrate, the color of the transmitted ink cannot be as bright as the original color. In terms of expressing metallic luster, even if metallic ink is used, it cannot reflect a bright metallic texture.

Utility model content

The purpose of the utility model is to overcome the defect of poor glossiness of the plastic shell in the prior art, and provide a plastic shell with perfect decorative effect.

The utility model provides a plastic shell, the plastic shell includes a base material and a transparent film layer on the surface of the base material, the plastic shell also includes a metal film layer, and the metal film layer is located on the surface of the base material between the transparent film layer.

Further, the plastic casing also includes an ink layer disposed between the transparent film layer and the metal film layer.

Furthermore, the plastic casing also includes an adhesive layer disposed between the metal film layer and the surface of the substrate.

The utility model also provides a mobile phone casing, which is made of the above-mentioned plastic casing.

According to the plastic shell provided by the utility model, a metal film layer is provided on the surface of the base material, and a transparent film layer is provided outside the metal film layer, so that the shell has a strong metallic texture and a high-bright metallic luster, More wear-resistant, more reliable quality. The quality and grade of the product adopting the plastic shell are improved.

Description of drawings

FIG. 1 is a schematic diagram of a plastic housing of an embodiment of the present invention.

Detailed ways

The plastic shell provided by the utility model includes a base material and a transparent film layer on the surface of the base material of the shell, wherein the shell also includes a metal film layer, and the metal film layer is located on the surface of the base material and the transparent film layer. between.

As shown in Figure 1, the plastic housing provided according to this embodiment includes a housing base material 1, a transparent film layer 6 located on the surface of the base material 1, and a metal layer located between the surface of the base material 1 and the transparent film layer 6. Film layer 4.

An ink layer 5 is arranged between the metal film layer 4 and the transparent film layer 6 to reflect the pattern color of the product. In order to increase the bonding force between the metal film layer 4 and the base material 1 while protecting the metal film layer 4 , an adhesive layer is provided between the metal film layer 4 and the base material 1 . The adhesive layer in this embodiment is preferably two layers, including a first adhesive layer 2 on the surface of the substrate 1 and a second adhesive layer 3 on the first adhesive layer 2, the first adhesive layer is an adhesive layer, and the second adhesive layer is a varnish layer.

The housing substrate can be various plastic substrates, such as plastic materials commonly used in electronic products, such as polyester, polycarbonate PC, acrylonitrile-butadiene-styrene ABS, polymethacrylate Ester PMMA, or a composite of at least two of them

There are many kinds of materials for the transparent film layer 6, such as polycarbonate PC, polyethylene terephthalate PET, polymethyl methacrylate PMMA and the like. In this example, the PC sheet is selected. The molding and processing of the PC sheet are relatively good, and the surface gloss and wear resistance are also good. The PC sheet used in this example is the DMX glossy sheet of GE Company.

Before the transparent film layer 6 is formed, the printing ink layer 5, the metal film layer 4, the second adhesive layer 3, and the first adhesive layer 2 need to be sequentially formed on the PC sheet.

The printing ink layer 5 is selected from inks with high temperature resistance, good adhesion, good flexibility and high softening point. What this embodiment uses is the N2K series ink of Germany Powerlong Company: the ink is the N2K series translucent yellow-green ink, the thinner is selected from N2K097-003, and the addition is 15%; the hardener is selected from N2K005, and the addition is 3%; The printing method is screen printing: 150-300 mesh/cm colored polyester screen is selected, solvent-resistant photosensitive coating is used, and the printing machine is a traditional printing machine. The printing method is well known to those skilled in the industry, and will not be described here. Put the PC sheet printed with ink into the oven and bake at 80°C for 30 minutes to completely evaporate the solvent in the ink and dry it thoroughly.

The metal layer 4 can be various metal layers that can be plated on the base material of the housing, such as nickel, chromium, tin, indium, indium tin alloy, aluminum or stainless steel, so that the housing of the present utility model has a metal layer. texture. The metal layer 4 described in the embodiment of the utility model is preferably tin, and various methods can be used for the formation method of the metal layer. In the utility model, the method of physical vapor deposition (PVD) is preferably used, and the method of physical vapor deposition (PVD) includes Sputtering coating, ion coating, evaporation coating, preferably adopt the method of evaporation coating. The method of evaporating and coating is carried out by conventional methods, such as using Tengsheng furnace evaporation equipment, the vacuum degree is 1-8×10-2Pa, the preheating power is 10%-30% (the percentage of the total power), the preheating time 10-20s; pre-melting power 25%-35% (percentage of total power), pre-melting time 15-25s; coating power 30%-60% (percentage of total power), coating time 15-25s. Sputtering coating is also a conventional method, for example, using a Youwei horizontal coating machine, the cleaning vacuum is 1-5×10 ^-2 Pa, the cleaning power is 600W, the cleaning time is 20s, the coating vacuum is 2-5×10 ^-3 Pa, and the coating power is 3KW , coating time 2S, coating times once. The film layer of sputtering coating is denser and thinner than that of evaporation, and its adhesion is better than that of evaporation

The second adhesive layer 3 adopts N2K093 transparent varnish from Baolong Company of Germany, which can be formed by printing process. Before printing, the PC sheet attached with the metal film layer 4 will be cleaned, otherwise the surface of the metal film layer 4 will be dirty. It will cause defects such as color difference and air bubbles in printing. The printing equipment and printing method are the same as the printing ink layer 2 above.

The first adhesive layer 2 uses a water-based adhesive, and the printing equipment and printing method are the same as the printing of the second adhesive 3 above. When there are air bubbles during printing due to the stickiness of the adhesive, some defoaming agent can be added to solve this problem. Generally, the proportion of addition should not exceed 0.5%. In order to cooperate with the whole process, this embodiment printed the adhesive three times, each The printing must be dried before the next printing, and the quality of each printing must be guaranteed to prevent color difference, impurities, bubbles and other defects.

The PC sheet after the above process is cut into the required size, and then the PC material is molded, and the flat PC sheet is formed into a shape that matches the outer surface of the substrate 1 . Compression molding has strict requirements on the design and manufacture of molds. Attention must be paid to the mutual cooperation between the forming mold and the cavity of the injection mold, and the shape and size errors of the two should have high processing accuracy. To avoid sharp corners, all corners should adopt a circular arc transition method. This embodiment is high-pressure molding, that is, the preheated PC sheet is molded with air on a metal mold at a temperature above 150°C. During the molding process, attention should be paid to adjusting the molding temperature, configuring the pressure and holding time. The equipment used in this example is LFORM100-A high-pressure molding machine. Pressurize 7Kg under low pressure and keep the pressure for 5s. Finally exhaust 12s.

After the part of the PC sheet that does not need to cooperate with the base material 1 is punched off, it is shaped into a transparent film layer 6 . Before starting the injection molding of the substrate 1, the pre-shaped transparent film layer 6 is inserted into the injection mold from the back. This injection mold comprises die and molding die (convex die), the depth of concave film cavity should be bigger than the thickness of a transparent film layer 6 than the height of molding die, after transparent film layer 6 is put into die, the base material 1 The injection compound is injected on the inner surface of the transparent film layer 6, so that the injection compound and the transparent film layer 6 are bonded together to be solidified and molded. In this embodiment, the injection molding material used is PC7300, and the injection molding temperature is 260-275° C. The injection molding method is well known to those skilled in the art, for example, injection molding can be performed by using a Haitian 100-ton injection molding machine.

According to the plastic housing provided by the embodiment of the present invention, the formed first adhesive layer 2 has a thickness of 20-70 microns, preferably 50 microns, and the formed second adhesive layer has a thickness of 15-25 microns, Preferably 20 microns, the thickness of the formed metal film layer is 20-40 nanometers, preferably 30 nanometers, the thickness of the formed ink layer is 15-25 microns, preferably 20 microns, the thickness of the formed transparent film layer 0.1 to 0.2 mm, preferably 0.175 mm.

According to the plastic shell provided by the utility model, high-quality metal high-brightness, colorful effects and patterns with exquisite and delicate textures can be realized on the base material of the shell, so that the decorative effect of the shell is further improved, and it is durable Worn, higher quality.

According to the plastic shell provided by the utility model, the various properties of the shell such as adhesion, scratch resistance, vibration and wear resistance can still maintain good effects, such as the adhesion test can reach level 0 (shared 0, 1, 2, 3, 4 and 5 grades, 0 grade is the best), scratch resistance can reach 2N, vibration wear can reach 2H (H is hour, generally requires more than 1.5 hours).

Claims (8)

1, a kind of plastic casing, this plastic casing comprise base material and the transparent film layer that is positioned on the described substrate surface, it is characterized in that this plastic casing also comprises metallic diaphragm, and this metallic diaphragm is between substrate surface and transparent film layer.

2, plastic casing according to claim 1 is characterized in that, this plastic casing also comprises the ink lay that can be arranged between described transparent film layer and the metallic diaphragm.

3, plastic casing according to claim 1 and 2 is characterized in that, this plastic casing also comprises the adhesive layer that is arranged between metallic diaphragm and the substrate surface.

4, plastic casing according to claim 3 is characterized in that, described adhesive layer comprises first adhesive layer and second adhesive layer that is positioned on first adhesive layer on the substrate surface.

5, plastic casing according to claim 4 is characterized in that, described first adhesive layer is an adhesive phase, and second adhesive layer is the gloss oil layer.

6, plastic casing according to claim 4, wherein, the thickness of described first adhesive layer is 15～100 microns, the thickness of described second adhesive layer is 15～40 microns, the thickness of described metallic diaphragm is 20～50 nanometers, described thickness transparent or that be printed on the ink lay of pattern color is 20～40 microns, and the thickness of described transparent film layer is 0.1～0.3 millimeter.

7, plastic casing according to claim 6, wherein, the thickness of described first adhesive layer is 20～70 microns, the thickness of described second adhesive layer is 15～25 microns, the thickness of described metallic diaphragm is 30～40 nanometers, described thickness transparent or that be printed on the ink lay of pattern color is 25～35 microns, and the thickness of described transparent film layer is 0.1～0.2 millimeter.

8, a kind of mobile phone is characterized in that, described phone housing requires 1 to 8 each described plastic casing to make by aforesaid right.

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