CN109348697B - Production process of shielding case for electronic product - Google Patents
Production process of shielding case for electronic product Download PDFInfo
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- CN109348697B CN109348697B CN201811370577.6A CN201811370577A CN109348697B CN 109348697 B CN109348697 B CN 109348697B CN 201811370577 A CN201811370577 A CN 201811370577A CN 109348697 B CN109348697 B CN 109348697B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
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- Application Of Or Painting With Fluid Materials (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a production process of a shielding case for an electronic product, which relates to the technical field of electromagnetic shielding and comprises the steps of base material pretreatment, coating printing, baking, cooling and the like; the baking temperature is 180-220 ℃ in the baking process, and the baking time is 3-5 min; and the baking process sequentially comprises a first middle-temperature section, a high-temperature section, a second middle-temperature section and a second high-temperature section from beginning to end, and the baking temperature difference between any two adjacent sections is at least 10 ℃. The invention provides the production process of the shielding case for the electronic product, which can improve the service performance of the metal shielding case, prolong the service life of the metal shielding case and also contribute to improving the production efficiency and the product delivery quality.
Description
Technical Field
The invention relates to the technical field of electromagnetic shielding, in particular to a production process of a shielding case for an electronic product.
Background
The shielding cover is a tool for shielding electronic signals, can effectively shield the influence of external electromagnetic waves on an internal circuit and the outward radiation of the electromagnetic waves generated inside, and is mainly applied to electronic products such as mobile phones, GPS, computers and the like.
The invention patent application with the prior patent application publication number of CN107302842A discloses a method for printing a single insulating paint on a metal shielding cover and a single structure of the metal shielding cover.
When the technical scheme is adopted for producing the metal shielding cover, the curing effect of the insulating paint on the metal shielding cover is difficult to guarantee, so that the insulating paint is easy to locally drop in use, the service performance of the metal shielding cover is greatly reduced, and the service life of the metal shielding cover is greatly influenced.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a process for producing a shielding case for electronic products, which ensures the curing effect of a coating on a metal material tape, improves the usability of the metal shielding case, and prolongs the service life of the metal shielding case.
In order to achieve the purpose, the invention provides the following technical scheme:
a production process of a shielding case for electronic products comprises the following steps:
s1, preprocessing the base material to obtain the required metal material belt;
s2, printing a coating on the surface of the metal material belt;
s3, baking, namely baking the metal strip with the surface printed with the coating;
s4, cooling;
in step S3, the baking temperature is 180-220 ℃ during the baking process, and the baking time is 3-5 min.
By adopting the technical scheme, in production, after the printing of the coating on the metal material belt is completed, the baking temperature and the baking time of the metal material belt are strictly controlled, the curing effect of the coating on the metal material belt is ensured, the possibility of falling of the coating is reduced, the service performance of the metal shielding cover is indirectly improved, and the service life of the metal shielding cover is prolonged.
The invention is further configured to: in step S3, the baking process includes four stages, i.e., a first middle-temperature stage, a high-temperature stage, a second middle-temperature stage, and a second high-temperature stage, in sequence from the beginning to the end, and the baking temperature difference between any two adjacent stages is at least 10 ℃.
Through adopting above-mentioned technical scheme, divide into four stages of the baking temperature diverse with the baking process, when guaranteeing curing speed, avoid the coating because of the too high colour and luster darkening and the scheduling problem that ftractures appear, guarantee the coating indirectly and toast the effect.
The invention is further configured to: the baking temperature of the first medium-temperature section is 195-205 ℃; the baking temperature of the high-temperature section is 215-225 ℃; the baking temperature of the second medium-temperature section is 195-205 ℃; the baking temperature of the secondary high-temperature section is 175-185 ℃.
The invention is further configured to: the baking time length ratio of the first medium-temperature section, the high-temperature section, the second medium-temperature section and the second high-temperature section is 1:3:2: 1.
By adopting the technical scheme, the first medium-temperature section can prepare for the coating to enter the high-temperature section, and the coating can be rapidly cured in the high-temperature section; meanwhile, the baking time of the high-temperature section is controlled to be longest, and the baking effect of the coating can be ensured. Next, after the high temperature section, set up second moderate temperature section between high temperature section and inferior high temperature section, avoid the coating cooling too fast, can further bake the coating on the one hand, on the other hand can avoid the coating because of the cooling problem that the fracture appears too fast, and second moderate temperature section can play the effect of buffering. And finally, the secondary high-temperature section can realize the subsequent baking of the coating under the relatively low-temperature condition, so that the part which is not fully cured in the coating is completely cured.
The invention is further configured to: and step S3, the whole process is completed in an oven, the oven sequentially comprises 4 baking areas from an inlet to an outlet, and each baking area respectively corresponds to a first medium-temperature section, a high-temperature section, a second medium-temperature section and a second high-temperature section.
By adopting the technical scheme, the baking operation of the metal material belt is completed by the aid of the baking oven comprising a plurality of baking areas; in the whole production process, the metal material belt can keep a continuous feeding state on a production line, and the production efficiency is improved.
The invention is further configured to: in step S1, before the printing of the coating is started, the following steps should be performed on the metal tape: punching, namely punching a plurality of rows of positioning holes on the metal material belt at uniform intervals along the length direction of the metal material belt; the distance between any two adjacent rows of positioning holes is larger than or equal to the size of the coating along the length direction of the metal material belt.
By adopting the technical scheme, the metal material belt can be assisted in printing operation by the aid of the positioning holes on the metal material belt; in actual work, any coating is printed on the middle section of two adjacent rows of positioning holes; by means of the positioning holes, automatic and high-precision coating printing operation is facilitated.
The invention is further configured to: in step S2, the coating printing is completed by screen printing.
By adopting the technical scheme, the screen printing has the advantages of small limitation, soft printing surface, small imprinting, strong adhesive force, convenient plate making and the like, can ensure the printing quality of the coating, and can avoid overhigh production cost.
The invention is further configured to: in step S4, the metal tape is cooled by using cold air at 40 to 50 ℃.
Through adopting above-mentioned technical scheme, carry out cooling treatment with the help of cold wind to the metal material area, the cooling in metal material area is with higher speed, helps improving production efficiency.
The invention is further configured to: after step S4 is completed, the method further includes the following steps:
and S5, inspecting and rolling, inspecting the printing quality of each coating on the surface of the metal material belt, marking the coating with the quality not reaching the standard, and rolling the metal material belt.
Through adopting above-mentioned technical scheme, in actual production, crooked and the uneven quality problems of thickness can appear in the coating on the metal material area unavoidably, for guaranteeing the product quality that dispatches from the factory, mark the substandard coating of quality in the inspection, realize effective quality control to help improving follow-up production.
In conclusion, the invention has the following beneficial effects:
1. after the printing of the coating on the metal material belt is finished, strictly controlling the baking temperature and the red baking time of the metal material belt, ensuring that the metal material belt can be fully baked, ensuring the curing effect of the coating on the metal material belt, reducing the possibility of coating separation, indirectly ensuring the service performance of the metal shielding cover and prolonging the service life of the metal shielding cover;
2. the baking operation of the metal material belt is completed by the baking oven comprising a plurality of baking areas, and the baking operation of the metal material belt is completed in the feeding process of the metal material belt, so that the production efficiency is improved;
3. after the metal material belt is cooled and before rolling is started, all coatings on the metal material belt are inspected, and the coatings with the quality reaching the standard are marked, so that the outgoing quality of products is guaranteed.
Drawings
Fig. 1 is a schematic flow chart of a process for manufacturing a shield case for an electronic product according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, a process for manufacturing a shield can for an electronic product includes the following steps:
and S1, preprocessing the base material to obtain the required metal material belt. In actual production, the base material used may be an SPCC cold rolled steel strip or a stainless steel strip. In the base material pretreatment process, workers can firstly carry out calendering treatment on the base material steel strip by means of a calender to calender the steel strip to the required thickness. Then, the worker can cut the steel strip into required width specifications by using a steel strip slitting machine and form a required metal material strip; in practical work, the metal material strip usually has a width specification of 30mm, 50mm, 100mm and the like. After the steel strip is cut, workers can use the cleaning agent to clean the surface of the steel strip as required to ensure the surface cleanliness of the steel strip.
And S2, printing a coating on the surface of the metal material belt. Before formally starting coating printing, in order to ensure the accuracy of coating printing on the metal material belt, punching operation can be firstly carried out on the metal material belt, namely a plurality of rows of positioning holes are punched on the metal material belt at uniform intervals along the length direction of the metal material belt; the distance between any two adjacent rows of positioning holes is not less than the size of the coating along the length direction of the metal material belt. In the actual coating printing process, any coating is just positioned on the middle section of the two adjacent rows of positioning holes.
After the punching is finished, the worker can selectively carry out electroplating treatment on the metal strip according to the requirements of users. When a user requires that the metal shielding cover has relatively high wear resistance, corrosion resistance and antirust performance, a worker can plate a nickel plating layer on the metal material belt in an electroplating mode; when the user has higher requirements on the welding performance of the shielding case, the worker can choose to electroplate a tin plating layer on the surface of the metal material belt.
When the coating printing is started, the coating on the metal material belt can be finished by adopting a screen printing mode, namely, a worker can finish the automatic printing of the coating on the metal material belt by means of a screen printing machine; in the process, the positioning holes can assist a sensor on the screen printing machine to realize automatic positioning, and high-precision and automatic printing operation of the coating is facilitated. And, the coating on the metal material area can be selected according to the user's needs, for example, the coating can be selected from a heat dissipation coating or an insulating coating.
And S3, baking the metal strip with the coating printed on the surface. In actual production, in order to ensure the production efficiency, the whole baking operation is finished by using an oven. The whole length of the oven can be 22-26 m; in the direction from the inlet to the outlet of the oven, the oven sequentially comprises 4 baking areas, wherein the baking temperatures are 195-205 ℃, 215-225 ℃, 195-205 ℃ and 175-185 ℃, and the length ratio of the baking areas is 1:3:2: 1.
In production, the metal material belt is continuously fed and sequentially passes through each baking area in the oven, and each baking area corresponds to one stage in baking; from the entrance of the oven, in the process of passing the metal material strip through the oven, the coating on the metal material strip sequentially goes through four stages of a first middle-temperature stage, a high-temperature stage, a second middle-temperature stage and a second high-temperature stage, wherein the four stages of the first middle-temperature stage, the high-temperature stage, the second middle-temperature stage and the second high-temperature stage respectively correspond to the baking areas, namely the baking temperatures of the first middle-temperature stage, the high-temperature stage, the second middle-temperature stage and the second high-temperature stage are 195-205 ℃, 215-225 ℃, 195-205 ℃ and 175-185 ℃, and the baking time length ratio is 1:3:2: 1.
And S4, cooling. In production, a cooling device can be arranged at the tail part of the oven, and the cooling device can adopt a cooling fan and carry out cooling treatment on the metal material belt by means of cold air at 40-50 ℃ so as to accelerate the cooling of the metal material belt.
And S5, inspecting and rolling, inspecting the printing quality of each coating on the surface of the metal material belt, marking the coating with the quality not reaching the standard, and rolling the metal material belt. In production, the situations of unqualified coating quality comprise missing printing, uneven coating thickness, coating deflection and the like, and the marking of the unqualified coatings not only is beneficial to realizing effective quality monitoring, but also can indirectly promote the improvement of the subsequent process.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. A production process of a shielding case for an electronic product is characterized by comprising the following steps:
s1, preprocessing the base material to obtain the required metal material belt; s2, printing a coating on the surface of the metal material belt; s3, baking, namely baking the metal strip with the surface printed with the coating; s4, cooling;
in step S3, the baking temperature is 180-220 ℃ in the baking process, and the baking time is 3-5 min; the baking process sequentially comprises a first middle-temperature section, a high-temperature section, a second middle-temperature section and a second high-temperature section from beginning to end, and the baking temperature difference of any two adjacent stages is at least 10 ℃; the baking temperature of the first medium-temperature section is 195-205 ℃; the baking temperature of the high-temperature section is 215-225 ℃; the baking temperature of the second medium-temperature section is 195-205 ℃; the baking temperature of the secondary high-temperature section is 175-185 ℃; the baking time length ratio of the first medium-temperature section, the high-temperature section, the second medium-temperature section and the second high-temperature section is 1:3:2: 1.
2. The production process of the shielding case according to claim 1, wherein the step S3 is integrally completed in an oven, the oven sequentially comprises 4 baking areas from an inlet to an outlet, and each baking area corresponds to the first intermediate temperature section, the high temperature section, the second intermediate temperature section and the second high temperature section.
3. The process of claim 1, wherein the metal strip is subjected to the following steps before printing the coating in step S1: punching, namely punching a plurality of rows of positioning holes on the metal material belt at uniform intervals along the length direction of the metal material belt; the distance between any two adjacent rows of positioning holes is larger than or equal to the size of the coating along the length direction of the metal material belt.
4. The process of claim 1 or 3, wherein the step S2 is performed by screen printing.
5. The process of claim 1, wherein in step S4, the metal strip is cooled by cold air at 40-50 ℃.
6. The process for producing a shield can according to claim 1, further comprising the following steps after completion of step S4:
and S5, inspecting and rolling, inspecting the printing quality of each coating on the surface of the metal material belt, marking the coating with the quality not reaching the standard, and rolling the metal material belt.
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| CN201811370577.6A CN109348697B (en) | 2018-11-17 | 2018-11-17 | Production process of shielding case for electronic product |
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| CN201811370577.6A CN109348697B (en) | 2018-11-17 | 2018-11-17 | Production process of shielding case for electronic product |
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| CN109348697B true CN109348697B (en) | 2020-04-03 |
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| CN111902035B (en) * | 2020-08-10 | 2022-11-04 | 东莞市信为兴电子有限公司 | Shielding case applicable to 5G mobile phone, 5G mobile phone and production method of shielding case |
| CN112236028B (en) * | 2020-10-26 | 2023-02-28 | 宁波恒浩广新型电子材料有限公司 | Production process of heat dissipation shielding cover material belt |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106003916A (en) * | 2016-05-04 | 2016-10-12 | 胡银坤 | Electromagnetic shielding film |
| CN108668517A (en) * | 2017-04-01 | 2018-10-16 | 中国科学院化学研究所 | Electromagnetic shielding film and preparation method thereof |
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| CN202191993U (en) * | 2011-06-17 | 2012-04-18 | 佛山克莱汽车照明有限公司 | High-temperature coating head device |
| CN103100515B (en) * | 2011-11-14 | 2014-11-05 | 江苏丽岛新材料股份有限公司 | Manufacture method for stone pattern color-coating aluminum plate |
| CN104125763B (en) * | 2014-07-08 | 2017-12-15 | 广东和润精密五金材料股份有限公司 | The production and processing method of use for electronic products an insulating shroud |
| CN104403092A (en) * | 2014-12-15 | 2015-03-11 | 天津凯华绝缘材料股份有限公司 | Polyester curing agent with hyperbranched structure and synthetic method of polyester curing agent |
| CN105903655A (en) * | 2015-10-23 | 2016-08-31 | 浙江亿诺家居用品有限公司 | Vacuum cup paint spraying method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106003916A (en) * | 2016-05-04 | 2016-10-12 | 胡银坤 | Electromagnetic shielding film |
| CN108668517A (en) * | 2017-04-01 | 2018-10-16 | 中国科学院化学研究所 | Electromagnetic shielding film and preparation method thereof |
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