Mobile phone shell printing process

Abstract

The invention relates to the technical field of printing processes, in particular to a mobile phone shell printing process. The printing process comprises the following steps: sequentially carrying out first transfer printing, second transfer printing, semi-curing and baking on a to-be-printed part of a wire drawing surface of the mobile phone shell. According to the printing process, the first transfer printing and the second transfer printing are sequentially carried out on the to-be-printed position of the wiredrawing face of the mobile phone shell to print full and clear patterns, then semi-curing and baking complete curing are sequentially carried out, and the printed patterns good in wear resistance and adhesive force are obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printing method, in particular to a mobile phone shell printing process. BACKGROUND

[0002] The material of the conventional anti-real mobile phone shell is usually aluminum material, and after mechanical processing, an anti-real mobile phone shell with the same size and shape as the required real mobile phone shell is obtained. The circumference of the anti-real mobile phone shell can be provided with a wire-drawing texture to form a wire-drawing surface, so as to enhance the metal texture and improve the visual effect. In order to further simulate, a simulated antenna needs to be printed on the wire-drawing surface. The current mobile phone shell printing process is pad printing, as shown in the Chinese patent application No. 201410123418.1. However, pad printing on the wire-drawing surface is prone to produce unclear printing, broken lines and other defects. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a mobile phone shell printing process with good printing effect on the wire-drawing surface.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: a mobile phone shell printing process, comprising the following steps: sequentially performing first pad printing, second pad printing, semi-curing and baking on the to-be-printed part of the wire-drawing surface of the mobile phone shell.

[0005] The mobile phone shell printing process of the present application has the beneficial effects that: the mobile phone shell printing process of the present application sequentially prints a full and clear pattern on the to-be-printed part of the wire-drawing surface of the mobile phone shell by first pad printing and second pad printing, and then sequentially performs semi-curing and baking to completely cure, so as to obtain a printed pattern with good wear resistance and good adhesion. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 It is the physical map of the printed mobile phone shell of the specific embodiment of the present application; Figure 2 It is another angle physical map of the printed mobile phone shell of the specific embodiment of the present application. DETAILED DESCRIPTION

[0007] In order to explain the technical content, the achieved purposes and effects of the present application in detail, the following will be explained in combination with the embodiments and the accompanying drawings.

[0008] A mobile phone shell printing process, comprising the following steps: sequentially performing first pad printing, second pad printing, semi-curing and baking on the to-be-printed part of the wire-drawing surface of the mobile phone shell.

[0009] From the above description, the beneficial effects of the present application are that the present application sequentially performs first transfer printing and second transfer printing at the to-be-printed position of the wire-drawing surface of the mobile phone shell, and the two transfer printing can ensure that the pattern printed on the wire-drawing surface of the mobile phone shell is full and clear. Then semi-curing is performed to prevent the product from being touched, stuck and generating defective products during taking, placing or transferring, and finally baking is performed to realize complete curing and obtain a wear-resistant, full and clear printed pattern.

[0010] Further, the hot air heating is continuously performed during the first transfer printing and the second transfer printing.

[0011] From the above description, during the transfer printing of the wire-drawing surface, if the surface ink is not cured in time, it is easy to flow away with the wire-drawing groove, affecting the surface effect, and the requirement is relatively high for planar printing or transfer printing. Therefore, hot air heating is continuously performed during the transfer printing to avoid defects caused by ink flow.

[0012] Further, the temperature of the hot air heating is 75-85 DEG C.

[0013] From the above description, if the temperature of the hot air heating is too high, the ink has been printed will be cured, and if the temperature is too low, the ink is easy to flow away with the wire-drawing groove, which will affect the transfer printing effect.

[0014] Further, the first preliminary curing is performed after the first transfer printing. That is, the first preliminary curing is performed between the first transfer printing and the second transfer printing.

[0015] From the above description, if the preliminary curing is only performed after all the transfer printing is completed, the surface ink adhesion and wear resistance will be insufficient due to the incomplete drying of the bottom ink.

[0016] Further, the specific steps of the first preliminary curing are that the hot air heating is performed at 75-85 DEG C for 4-6s.

[0017] Further, the second preliminary curing is performed after the second transfer printing. That is, the second preliminary curing is performed between the second transfer printing and the semi-curing.

[0018] From the above description, the second preliminary curing is performed after the second transfer printing, which facilitates the transfer and is not easy to cause defects, broken lines and blurring due to touching.

[0019] Further, the specific steps of the second preliminary curing are that the hot air heating is performed at 75-85 DEG C for 4-6s.

[0020] Further, the semi-curing is performed on the flow wire with a baking device.

[0021] From the above description, the semi-curing of the shell is performed on the flow wire, which can prevent the printed position from being touched during taking and placing, and the ink from being damaged and defective.

[0022] Further, the semi-curing temperature is 75-85℃.

[0023] Further, the pulling speed of the flow pulling line is 1.3-1.8m / s.

[0024] From the above description, it can be seen that the temperature of the flow pulling line is low, the speed is fast, the curing degree is more convenient to control, and the production speed is improved.

[0025] Further, the baking temperature is 90-110℃.

[0026] From the above description, it can be seen that complete curing is realized after baking.

[0027] Further, the printing paste used in the first and second pad printing includes ink and thinner, and the volume ratio of the ink and thinner is 1:0.06-0.09.

[0028] From the above description, it can be seen that the ink and thinner are used in low ratio, which can reduce the ink flowability and is beneficial to printing on the wire drawing surface.

[0029] Further, the ink is SG740 series ink of Seiko.

[0030] From the above description, it can be seen that the SG740 series ink of Seiko is a fast-drying two-liquid reactive ink, which can reduce the ink flowability, is beneficial to printing on the wire drawing surface, has higher production efficiency, has high adhesion and high moisture resistance to various materials, and has solvent resistance.

[0031] Embodiment one of the present application is a mobile phone shell printing process, and the specific steps are as follows: S1: mixing SG740 series ink of Seiko and thinner in a volume ratio of 1:0.08 to obtain the paste for the first and second pad printing; S2: performing the first pad printing on the to-be-printed part of the wire drawing surface of the mobile phone shell; the hot air heating at 80℃ is continuously performed during the first pad printing; S3: performing the first preliminary curing by 80℃ hot air heating for 5s; S4: performing the second pad printing on the to-be-printed part of the wire drawing surface of the mobile phone shell; the hot air heating at 80℃ is continuously performed during the second pad printing; S5: performing the second preliminary curing by 80℃ hot air heating for 5s; S6: performing semi-curing on the flow pulling line with a baking device, the semi-curing temperature is 80℃, and the pulling speed is 1.5m / s; the length of the baking device is 5m; S7: placing in a 100℃ oven and baking for 90min.

[0032] Embodiment two of the present application is a mobile phone shell printing process, and the specific steps are as follows: S1: mix the Seiko SG740 series ink with the diluent at a volume ratio of 1:0.06 to obtain the slurry for the first and second pad printing; S2: perform the first pad printing on the to-be-printed part of the wire-drawing surface of the mobile phone shell; the hot air heating at 75 DEG C is continuously performed during the first pad printing; S3: perform the first preliminary curing by hot air heating at 75 DEG C for 6s; S4: perform the second pad printing on the to-be-printed part of the wire-drawing surface of the mobile phone shell; the hot air heating at 75 DEG C is continuously performed during the second pad printing; S5: perform the second preliminary curing by hot air heating at 75 DEG C for 6s; S6: perform the semi-curing on the flow wire with the baking equipment, the semi-curing temperature is 75 DEG C, and the wire speed is 1.3m / s; the length of the baking equipment is 5m; S7: place in the oven at 90 DEG C and bake for 100min.

[0033] Embodiment three of the application is a mobile phone shell printing process, and the specific steps are as follows: S1: mix the Seiko SG740 series ink with the diluent at a volume ratio of 1:0.09 to obtain the slurry for the first and second pad printing; S2: perform the first pad printing on the to-be-printed part of the wire-drawing surface of the mobile phone shell; the hot air heating at 85 DEG C is continuously performed during the first pad printing; S3: perform the first preliminary curing by hot air heating at 85 DEG C for 4s; S4: perform the second pad printing on the to-be-printed part of the wire-drawing surface of the mobile phone shell; the hot air heating at 85 DEG C is continuously performed during the second pad printing; S5: perform the second preliminary curing by hot air heating at 85 DEG C for 4s; S6: perform the semi-curing on the flow wire with the baking equipment, the semi-curing temperature is 85 DEG C, and the wire speed is 1.8m / s; the length of the baking equipment is 5m; S7: place in the oven at 110 DEG C and bake for 85min.

[0034] Embodiment four of the application is a mobile phone shell printing process, and the specific steps are as follows: S1: mix the Seiko SG740 series ink with the diluent at a volume ratio of 1:0.07 to obtain the slurry for the first and second pad printing; S2: perform the first pad printing on the to-be-printed part of the wire-drawing surface of the mobile phone shell; the hot air heating at 78 DEG C is continuously performed during the first pad printing; S3: perform the first preliminary curing by hot air heating at 78 DEG C for 5s; S4: the second pad printing is performed at the to-be-printed position of the wire-drawing surface of the mobile phone shell, and the hot air heating at 78 DEG C is continuously performed during the second pad printing; S5: the second preliminary solidification is performed by hot air heating at 78 DEG C for 5s; S6: the semi-solidification is performed on the flow wire with a baking device, the temperature of the semi-solidification is 78 DEG C, the wire speed is 1.4 m / s, and the length of the baking device is 5 m; S7: the baking is performed in an oven at 95 DEG C for 90 min.

[0035] Embodiment five of the present application is a mobile phone shell printing process, and the specific steps are as follows: S1: the precision SG740 series ink is mixed with a diluent at a volume ratio of 1:0.08 to obtain slurry for the first pad printing and the second pad printing; S2: the first pad printing is performed at the to-be-printed position of the wire-drawing surface of the mobile phone shell, and the hot air heating at 82 DEG C is continuously performed during the first pad printing; S3: the first preliminary solidification is performed by hot air heating at 82 DEG C for 4s; S4: the second pad printing is performed at the to-be-printed position of the wire-drawing surface of the mobile phone shell, and the hot air heating at 82 DEG C is continuously performed during the second pad printing; S5: the second preliminary solidification is performed by hot air heating at 82 DEG C for 4s; S6: the semi-solidification is performed on the flow wire with a baking device, the temperature of the semi-solidification is 82 DEG C, the wire speed is 1.6 m / s, and the length of the baking device is 5 m; S7: the baking is performed in an oven at 105 DEG C for 90 min.

[0036] Comparative example one of the present application is: The difference between comparative example one and embodiment one is that: the hot air heating is not performed during the first pad printing and the second pad printing.

[0037] Comparative example two of the present application is: The difference between comparative example two and embodiment one is that: S3 is not performed, and the second pad printing is directly performed after the first pad printing.

[0038] Comparative example three of the present application is: The difference between comparative example three and embodiment one is that: S5 is not performed, and the semi-solidification is directly performed after the second pad printing.

[0039] Comparative example four of the present application is: The difference between comparative example four and embodiment one is that: S6 is not performed, and the baking is directly performed after the second preliminary solidification.

[0040] The finished products prepared by embodiment one to five and comparative examples one to four are subjected to performance detection, and the detection results are shown in Table 1.

[0041] Crosshatch test: use sharp knife to draw a crosshatch with 1X1mm, area of 10X10mm, and each line reaches the bottom of the oil film, use 3M610# adhesive tape to stick the sample, grab one end of the tape and quickly pull it in the vertical direction, then observe whether the paint falls off the test surface and whether the tape sticks paint (a little paint loss is allowed at the intersection of the cuts, and the loss area is ≤5% is qualified (under the test conditions allowed, each surface needs to be tested).

[0042] Alcohol test: select the flat surface of the product, use the alcohol tester to test, the alcohol concentration is ≥99.7%, overlap the glasses cloth into 8 layers on the tester, wet the head of the glasses cloth with alcohol, keep the product parallel to the head of the glasses cloth, and test the alcohol at a speed of 30~40 times / minute, and the product without exposed substrate or discoloration is qualified.

[0043] Table 1

[0044] Among them, the comparative examples three and four do not affect the final effect, but in the operation process, it is easy to touch the printed part or product accumulation collision, etc., causing defects, broken lines, blur and other defects.

[0045] In summary, the mobile phone shell printing process provided by the application has the following advantages: 1. Two times of pad printing are performed to ensure that the pattern printed on the mobile phone shell is full and clear.

[0046] 2. Semi-curing is performed before baking to avoid the generation of defective products due to ink defects during product removal, placement or transfer.

[0047] 3. Hot air heating is continuously performed during pad printing to avoid defects caused by ink flow.

[0048] 4. After each pad printing is completed, primary curing is performed to avoid insufficient surface ink adhesion and wear resistance caused by incomplete drying of the bottom layer ink.

[0049] 5. The fast-drying ink and the diluent use low ratio, which can reduce the ink flowability and is beneficial to printing on the wire-drawing surface.

[0050] The above is only an embodiment of the application, and does not limit the patent scope of the application, and any equivalent transformation or direct or indirect application in related technical fields using the content of the application specification and drawings is also included in the patent protection scope of the application.

Claims

1. A process for printing a cell phone case, characterized by, The method comprises the following steps: The first pad printing, the second pad printing, the semi-curing and the baking are sequentially performed on the to-be-printed part of the drawn surface of the mobile phone shell.

2. The cell phone case printing process of claim 1, wherein, The hot air heating is continuously performed during the first pad printing and the second pad printing.

3. The cell phone case printing process of claim 2, wherein, The temperature of the hot air heating is 75-85 ℃.

4. The process for printing a cell phone case according to claim 1, wherein, The first pad printing is followed by the first initial curing.

5. The cell phone case printing process of claim 4, wherein, The specific steps of the first initial curing are that the hot air heating is performed at 75-85 ℃ for 4-6 s.

6. The cell phone case printing process of claim 1, wherein, The second pad printing is followed by the second initial curing.

7. The cell phone case printing process of claim 6, wherein, The specific steps of the second initial curing are that the hot air heating is performed at 75-85 ℃ for 4-6 s.

8. The cell phone case printing process of claim 1, wherein, The temperature of the semi-curing is 75-85 ℃.

9. The cell phone case printing process of claim 1, wherein, The temperature of the baking is 90-110 ℃.

10. The cell phone case printing process of claim 1, wherein, The printing paste used in the first pad printing and the second pad printing comprises ink and diluent, and the volume ratio of the ink to the diluent is 1:0.06-0.09.

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