WO2020238358A1 - 防爆手机玻璃背盖制作方法及玻璃背盖 - Google Patents

防爆手机玻璃背盖制作方法及玻璃背盖 Download PDF

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Publication number
WO2020238358A1
WO2020238358A1 PCT/CN2020/080556 CN2020080556W WO2020238358A1 WO 2020238358 A1 WO2020238358 A1 WO 2020238358A1 CN 2020080556 W CN2020080556 W CN 2020080556W WO 2020238358 A1 WO2020238358 A1 WO 2020238358A1
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back cover
explosion
ink
glass back
proof
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PCT/CN2020/080556
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English (en)
French (fr)
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赖耀升
金渶桓
江建志
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恩利克（浙江）智能装备有限公司
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Publication of WO2020238358A1 publication Critical patent/WO2020238358A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/34—Printing on other surfaces than ordinary paper on glass or ceramic surfaces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets

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  • the invention belongs to the field of mobile phone glass back covers, and more specifically relates to a method for manufacturing an explosion-proof mobile phone glass back cover and the glass back cover.
  • GDF Glass Deco Film
  • the GDF process is a decorative film process, and is currently widely used in the mobile phone back cover industry. Most models released by Huawei, oppo, vivo, and Huawei adopt this film process.
  • the advantage is that if a defective product is produced, the film can be torn off and returned to the factory for reprocessing.
  • the decoration is processed on the diaphragm and then attached, the 3D curved surface design will have a higher degree of freedom and is more convenient.
  • the film also affects the transmittance and thickness of the shell to a certain extent, and the entire process flow is complicated, which increases the processing procedures and costs.
  • the GDM (Glass Direct UV Molding) process is to directly process the texture and color of the glass back cover to achieve the effect of glare, simplify the UV Film (OCA) and bonding processes, and achieve the same maturity of the process. Based on it, theoretically it can be said to be a new manufacturing technology that can reduce costs.
  • This process was used in the lens protection sheet of mobile phone cameras in the early days, and was the preferred surface decoration process for dual-camera and multi-camera cameras.
  • the former Huawei Mate9Pro camera lens protector uses GDM technology to achieve glare effects.
  • the process flow is relatively simple, mainly including: glass back cover material ⁇ UV glue coating ⁇ UV curing ⁇ cleaning the mold and product surface ⁇ IR curing, etc.
  • GDM has significant advantages in many aspects, such as 1 .It can make the mobile phone thinner; 2. Better light transmission; 3. The pattern after texture transfer is more vibrant and beautiful; 4. The pattern made is more complicated and precise; 5. The process is reduced and the process flow is simplified.
  • the role of the UV layer is to make a texture, then electroplating or coloring, and finally form the texture, as shown in Figure 1, it has an anti-fingerprint film 1, glass back cover 2, and UV layer 3, electroplating layer 4 and printing layer 5. Furthermore, GDM has no explosion-proof effect. If an explosion-proof film is attached, the thickness of the back cover of the mobile phone will be very large, which is not conducive to the production of ultra-thin mobile phones.
  • the present invention provides a pattern ink with high printing accuracy, small thickness, simplified process flow, more efficient production, and the explosion-proof layer is directly printed by ink, making the entire back cover lighter and thinner.
  • the present invention provides the following technical solution: a method for manufacturing an explosion-proof glass back cover for a mobile phone, which is characterized by including the following steps:
  • Printing pattern layer the pattern ink that needs to be printed on the inner surface of the glass back cover is printed by the gravure pad printing device, and the pattern ink is cured to form the pattern layer;
  • the explosion-proof ink is printed on the pattern layer by the gravure pad printing device, and the explosion-proof ink is cured.
  • the further step 1) is repeated several times.
  • step 1) the metal layer is plated on the inner surface of the glass back cover by PVD.
  • the pattern ink in the step 1) is a multi-color mixed ink.
  • the further step 2) is repeated 3-5 times, and the thickness of the explosion-proof ink is 9-11um each time.
  • the curing method of the pattern ink and the explosion-proof ink is thermal curing.
  • step 1) according to the color depth of the printed pattern, a corresponding pattern template is made on the intaglio cylinder.
  • a glass back cover which is made by the above-mentioned manufacturing method.
  • the explosion-proof layer can be used as the background color with various color inks, and can also be overprinted into color;
  • Gravure pad printing can print various patterns, the thickness of the pattern can be changed by the pattern template made on the gravure cylinder, and it can be overprinted in various colors, even full color;
  • FIG. 1 is a schematic diagram of the structure of a glass back cover manufactured by GDM process in the prior art
  • FIG. 2 is a schematic diagram of the structure of the glass back cover with deep and shallow texture patterns produced by gravure pad printing in the present invention
  • FIG. 3 is a schematic diagram of the structure of the glass back cover that uses gravure pad printing and metal plating to produce different angles of color change in the present invention
  • FIG. 4 is a schematic diagram of the structure of the glass back cover using gravure pad printing and multi-color mixed ink to produce color gradients in the present invention
  • Fig. 5 is a schematic diagram of the structure of the intaglio pad printing device used in the present invention.
  • An explosion-proof mobile phone glass back cover manufacturing method includes the following steps:
  • Printing pattern layer The pattern ink 6 that needs to be printed is printed on the inner surface of the glass back cover 2 by a gravure pad printing device, and the pattern ink 6 is cured to form a pattern layer;
  • the explosion-proof ink 7 is printed on the pattern layer by a gravure pad printing device, and the explosion-proof ink 7 is cured.
  • the gravure printing device used in this embodiment mainly includes a gravure cylinder 91, a printing cylinder 92 and a fixture 93.
  • the printing cylinder 92 is a rubber roller, and the pattern is printed according to the needs before production
  • the production of the intaglio cylinder 91 includes the production of the pattern template on the intaglio cylinder 91 and the depth of the pattern template according to the thickness of the pattern ink 6 to be printed.
  • the pattern template on the intaglio cylinder 91 is the part that receives the ink.
  • the pattern ink 6 mentioned in this embodiment is the ink used to display the pattern
  • the explosion-proof ink 7 is the ink used to prevent the glass back cover 2 from breaking and splashing.
  • the glass back cover 2 is placed on the jig 93, an ink cylinder 95 is arranged in the ink tank 94, the ink cylinder 95 contacts the intaglio cylinder 91, and the intaglio cylinder 91 receives the pattern ink 6 along a
  • the ink scraper 96 is set next to the intaglio cylinder 91 to scrape off the ink at the pattern template on the intaglio cylinder 91.
  • the pad cylinder 92 rotates in the direction b to remove the pattern when it contacts the pattern template of the intaglio cylinder 91.
  • the pattern ink 6 in the template is transferred and received, and the rear glass back cover 2 moves in the c direction, and the inner side of the glass back cover 2 (the side facing the inside of the mobile phone) faces upwards and contacts the printing cylinder 92, and the printing cylinder 92 removes the pattern ink 6 Transfer printing on the surface of the glass back cover 2, and the back glass back cover 2 is heated to cure the pattern ink 6 to complete the printing of the pattern ink 6 to form a pattern layer; as shown in Figure 2, if the desired pattern has a color shade, it can be customized to match
  • the pattern template is designed according to the color depth on the pattern template.
  • the glass back cover 2 is then passed through another gravure pad printing device to print the explosion-proof ink 7 on the pattern layer and cured to complete the explosion-proof treatment process of the glass back cover 2 without a separate explosion-proof film. Reduce the overall thickness of the glass back cover 2.
  • the preferred curing method of the pattern ink 6 and the explosion-proof ink 7 is thermal curing, generally using an oven or infrared heating and drying thermal curing method, low equipment cost, fast curing speed, combined with a gravure pad printing device Forming an assembly line for mass production, greatly improving production efficiency, of course, other methods can also be used to solidify the ink.
  • the glass back cover 2 can be manufactured with the anti-fingerprint film 1.
  • the anti-fingerprint film 1 and the pattern layer are respectively located on two different sides of the glass back cover 2, and the manufacturing processes do not affect each other.
  • step 1) of this embodiment is repeated multiple times, and step 1) is repeated multiple times according to the required thickness of the pattern layer.
  • the metal layer 8 is plated on the inner surface of the glass back cover 2 by PVD.
  • the metal layer 8 is plated on the inner surface of the glass back cover 2, and then the pattern ink 6 is printed.
  • the electron gun can be used to plate metal (gold, silver, etc.) ), the thickness of the metal layer 8 can be controlled to control the light transmittance to produce different angles of discoloration.
  • the preferred pattern ink 6 in the step 1) of this embodiment is a multi-color mixed ink 61, and the use of the multi-color mixed ink 61 can make the glass back cover 2 have the effect of gradual discoloration of different colors.
  • the preferred step 2 of this embodiment is repeated 3-5 times, and the thickness of the explosion-proof ink 7 is 9-11um each time, so that the final explosion-proof film thickness is 30-50um, and the overall thickness is relative to the thickness of the existing adhesive explosion-proof film Still greatly reduced, combined with the printed pattern layer, the thickness of the entire glass back cover 2 is greatly reduced.
  • the preferred explosion-proof ink 7 in this embodiment can use the ink disclosed in the patent number 201611259798.7.
  • all inks are printed by a gravure pad printing device, and the printing accuracy is greatly improved, especially when the glass back cover 2 is curved, it can still maintain high-precision printing, which can avoid the occurrence of ink on the bend of the glass back cover 2.
  • Flowing ensures that the printing thickness is the same as the design sample, which is suitable for mass production and greatly reduces the cost.
  • a glass back cover 2 is manufactured by the above-mentioned manufacturing method.
  • the manufactured glass back cover 2 has a small thickness, a high degree of beautifully pattern, and has an explosion-proof function.

Abstract

一种防爆手机玻璃背盖制作方法，包括如下步骤：印刷图案层，通过凹版移印装置将需要印刷图案的图案油墨（6）印刷至玻璃背盖（2）的内侧面上，将图案油墨（6）固化，形成图案层；印刷防爆层，通过凹版移印装置将防爆油墨（7）印刷至图案层上方，将防爆油墨（7）固化。本发明图案油墨印刷精度高，厚度较小，工艺流程简化，生产更加高效，且防爆层由油墨直接印刷而成，使整个背盖更加轻薄。

Description

防爆手机玻璃背盖制作方法及玻璃背盖 技术领域
本发明属于手机玻璃背盖领域，更具体的说涉及一种防爆手机玻璃背盖制作方法及玻璃背盖。
背景技术
GDF(Glass Deco Film)是将纹理或图案通过UV转印的方式印到玻璃防爆膜上(一般为PET材质)，再与玻璃背盖贴合。
GDF工艺属于装饰膜工艺，目前在手机背盖行业应用广泛，华为、oppo、vivo、小米等发布的机型大多采用这种贴膜工艺。优势在于若生产出不良品，可以撕掉薄膜返厂重新加工。同时因为是在膜片上加工装饰，然后贴合，因此3D曲面设计自由度会更高，比较便利。但贴膜也使得外壳的透光度及厚度受到了一定的影响，并且整个工艺流程复杂，增加了加工工序及成本。
GDM(Glass Direct UV Molding)工艺是直接在玻璃背盖上进行纹理及颜色等装饰工艺加工，来达到炫光的效果，简化了UV Film(OCA)和贴合等工序，在同等工艺成熟度的基础上，理论上可以说是一种可降低成本的新制造技术。
这种工艺早期用在手机摄像头镜头保护片上，是双摄、多摄摄像头的首选表面装饰工艺。曾经的华为Mate9Pro摄像头镜头保护片就是采用GDM工艺来达到炫光效果。工艺流程相对来说简单，主要包括：玻璃背盖上料→UV胶涂布→UV固化→清洗模具及产品表面→IR固化等，相比于GDF工艺，GDM在诸多方面优势显着，比如1.可以让手机变得更薄；2.透光性更佳；3.纹理转印后的图案更加精致美观；4.制作的图案更为复杂精密；5.工艺减少，工序流程简化。
目前采用GDM工艺仍然有较多问题，如后盖玻璃防爆问题，3D玻璃弯曲处不易做UV压花，良率低量产难度大,工艺流程繁琐，目前手机行业中若想采用GDM玻璃背盖，一般会放弃UV压花制程，不做纹理，直接镀膜。
且GDM工艺的制程中，UV层的作用是做出纹理，然后电镀或上颜色，最终形成纹理，如图1所示，其自上至下依次具有防指纹膜层1、玻璃背盖2、UV层3、电镀层4和印刷层5。再者GDM没有防爆效果，如再贴上防爆膜，手机后盖的厚度将非常大，不利于超薄手机的制作。
发明内容
针对现有技术的不足，本发明提供了一种图案油墨印刷精度高，厚度较小，工艺流程简化，生产更加高效，且防爆层由油墨直接印刷而成，使整个背盖更加轻薄。
为实现上述目的，本发明提供了如下技术方案：一种防爆手机玻璃背盖制作方法，其特征在于包括如下步骤，
1)印刷图案层：通过凹版移印装置将需要印刷图案的图案油墨印刷至玻璃背盖的内侧面上，将图案油墨固化，形成图案层；
2)印刷防爆层：通过凹版移印装置将防爆油墨印刷至图案层上方，将防爆油墨固化。
进一步的所述步骤1)重复多次。
进一步的在步骤1)之前，通过PVD将金属层镀在玻璃背盖的内侧面上。
进一步的所述步骤1)中的图案油墨为多色混合油墨。
进一步的所述步骤2)重复3-5次，每次印刷防爆油墨的厚度在9-11um。
进一步的所述图案油墨和所述防爆油墨的固化方式为热固化。
进一步的在步骤1)之前，根据需要印刷图案的颜色深浅，在凹版滚筒上制作相应的图案模板。
一种玻璃背盖，玻璃背盖由上述的制作方法制成。
与现有技术相比，本发明的有益效果是：
1、可以让手机变得更薄；
2、工艺减少，工序流程简化,整体生产成本下降很多；
3、使用凹版移印印刷机,解决3D背盖弯曲处不易加工的问题,良品率高；
4、印刷防爆层(30-50um),防止玻璃破裂时碎片飞溅，提升玻璃背盖的使用安全性；
5、防爆层可用各种颜色油墨作为底色，也可套印成彩色；
6、先做AF及PVD制程,再做印刷制程,可简化量产的生产工序；
7、凹版移印可印刷各种图案,图案厚度可以由凹版滚筒上制作的图案模板实现各种变化,而且可套印各种颜色,甚至全彩化；
8、采用多色混合油墨可做各种颜色间的渐层变色效果。
附图说明
图1为现有技术中采用GDM工艺制作的玻璃背盖结构示意图；
图2为本发明中采用凹版移印产生具有深浅纹理图案的玻璃背盖结构示意图；
图3为本发明中采用凹版移印及镀金属层产生不同角度变色的玻璃背盖结构示意图；
图4为本发明中采用凹版移印及多色混合油墨产生色彩渐变的玻璃背盖结构示意图；
图5为本发明中采用的凹版移印装置的结构示意图。
附图标记：1、防指纹膜；2、玻璃背盖；6、图案油墨；61、色彩混合油墨；7、防爆油墨；8、金属层；91、凹版滚筒；92、移印滚筒；93、治具；94、油墨仓；95、油墨滚筒；96、油墨刮板。
具体实施方式
参照图2至图5对本发明防爆手机玻璃背盖制作方法的实施例做 进一步说明。
一种防爆手机玻璃背盖制作方法，包括如下步骤，
1)印刷图案层：通过凹版移印装置将需要印刷图案的图案油墨6印刷至玻璃背盖2的内侧面上，将图案油墨6固化，形成图案层；
2)印刷防爆层：通过凹版移印装置将防爆油墨7印刷至图案层上方，将防爆油墨7固化。
如图5所示，本实施例中采用的凹版移印装置，其主要包括凹版滚筒91、移印滚筒92和治具93，其中移印滚筒92为胶辊，在生产前根据需要印刷的图案制作凹版滚筒91，其包括凹版滚筒91上图案模板的制作，还包括根据需要印刷的图案油墨6厚度制作图案模板的深度，凹版滚筒91上的图案模板为接收油墨的部分。
在本实施例中提到的图案油墨6即用以显示图案的油墨，防爆油墨7即用以防止玻璃背盖2碎裂飞溅的油墨。
如图5所示，印刷时，玻璃背盖2放在治具93上，油墨仓94内设置油墨滚筒95，油墨滚筒95接触凹版滚筒91，凹版滚筒91由油墨滚筒95接收图案油墨6沿a方向转动，并在凹版滚筒91旁设置油墨刮板96，将凹版滚筒91上除图案模板处的油墨刮掉，同时移印滚筒92沿b方向转动，在接触凹版滚筒91的图案模板时将图案模板内的图案油墨6转移接收，而后玻璃背盖2沿c方向运动，玻璃背盖2的内侧面(朝向手机内部的一面)朝上并接触移印滚筒92，移印滚筒92将图案油墨6转移印刷于玻璃背盖2表面，而后玻璃背盖2经过加热将图案油墨6固化即可完成图案油墨6印刷形成图案层；如图2所示，如果需要的图案有颜色深浅，可以定制相匹配的图案模板，图案模板上根据颜色的深浅设计模板的深浅，移印到玻璃背盖2上后，形成不同区域不同的油墨厚度，来实现颜色深浅变化，即直接产生纹理，采用胶辊转移印刷图案油墨6精度高，图案精致美观，生产工艺制程减少，效率大大提高。
在印刷完成图案油墨6后，再将玻璃背盖2经过另一凹版移印装置，将防爆油墨7印刷于图案层，并固化，完成玻璃背盖2的防爆处理制程，无需单独的防爆膜，减小整体的玻璃背盖2厚度。
本实施例优选的所述图案油墨6和所述防爆油墨7的固化方式为热固化，一般使用烘箱或红外线加热烘干的热固化方式，设备成本低，固化速度快，与凹版移印装置结合形成流水线式进行批量生产，大大提高生产效率，当然也可采用其他方式将油墨固化。
当然在图案层印刷之前，可对玻璃背盖2先进行防指纹膜1的制程，防指纹膜1与图案层分别位于玻璃背盖2的两个不同的侧面上，制程相互不影响。
本实施例优选的所述步骤1)重复多次，根据需要的图案层厚度重复多次步骤1)即可。
如图3所示，本实施例优选的步骤1)之前，通过PVD将金属层8镀在玻璃背盖2的内侧面上。
在需要玻璃背盖2不同角度具有变色效果时，在印刷图案层之前，将金属层8镀在玻璃背盖2的内侧面上，而后再印刷图案油墨6，可用电子枪镀金属(金银等等),控制金属层8厚度可控制透光度,来产生不同角度的变色效果。
本实施例优选的所述步骤1)中的图案油墨6为多色混合油墨61，采用多色混合油墨61可使玻璃背盖2具有不同色彩渐层变色的效果。
本实施例优选的步骤2)重复3-5次，每次印刷防爆油墨7的厚度在9-11um，使最终的防爆膜厚度在30-50um，整体厚度相对于现有的粘贴式防爆膜厚度依然大大降低，与印刷的图案层结合，整个玻璃背盖2的厚度大大降低。
本实施例中优选的防爆油墨7可采用专利号为201611259798.7中公开的油墨。在本实施例中所有油墨采用凹版移印装置印刷，印刷精度大大提高，特别是在玻璃背盖2为曲面时，依然能够保持高精度 的印刷，可避免油墨在玻璃背盖2的弯曲处发生流淌，保证印刷厚度与设计样本相同，适用于批量生产，成本大大降低。
一种玻璃背盖2，玻璃背盖2由上述的制作方法制成，制成的玻璃背盖2厚度小，图案精美度高，且具有防爆功能。
以上所述仅是本发明的优选实施方式，本发明的保护范围并不仅局限于上述实施例，凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理前提下的若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (8)

  1. 一种防爆手机玻璃背盖制作方法，其特征在于包括如下步骤，
    1)印刷图案层：通过凹版移印装置将需要印刷图案的图案油墨印刷至玻璃背盖的内侧面上，将图案油墨固化，形成图案层；
    2)印刷防爆层：通过凹版移印装置将防爆油墨印刷至图案层上方，将防爆油墨固化。
  2. 根据权利要求1所述的防爆手机玻璃背盖制作方法，其特征在于：所述步骤1)重复多次。
  3. 根据权利要求1所述的防爆手机玻璃背盖制作方法，其特征在于：在步骤1)之前，通过PVD将金属层镀在玻璃背盖的内侧面上。
  4. 根据权利要求1所述的防爆手机玻璃背盖制作方法，其特征在于：所述步骤1)中的图案油墨为多色混合油墨。
  5. 根据权利要求1所述的防爆手机玻璃背盖制作方法，其特征在于：所述步骤2)重复3-5次，每次印刷防爆油墨的厚度在9-11um。
  6. 根据权利要求1-5中任意一项所述的防爆手机玻璃背盖制作方法，其特征在于：所述图案油墨和所述防爆油墨的固化方式为热固化。
  7. 根据权利要求1所述的防爆手机玻璃背盖制作方法，其特征在于：在步骤1)之前，根据需要印刷图案的颜色深浅，在凹版滚筒上制作相应的图案模板。
  8. 一种玻璃背盖，其特征在于：玻璃背盖由权利要求7的制作方法制成。
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