IMC process for household appliance decorating part

Abstract

The invention discloses an IMC (in-mold control) process for household appliance decorating parts, which comprises the following steps: aging PET (polyethylene terephthalate) at the temperature of 150 DEG C for 30 minutes, carrying out six touch film printing, carrying out reinforced lamination on a printed matter after the printed matter is qualified through inspection so as to facilitate the connection between an outgoing line of an IMC product and a connector of a client computer version, carrying out die cutting by adopting a cutting die after the steps are finished, and carrying out electrical testing on a film, the normal touch control function of the touch film is ensured, an IMC circuit is put into a rear mold cavity of a mold, an IMD decorative film is put into a front mold cavity, electrical performance detection is conducted on an IMC product through equipment, and the IMC product is packaged and delivered after being detected to be correct; a touch panel and an IMD decoration panel are integrated together, a double-faced adhesive tape of a traditional attaching technology is replaced with an adhesive, the product cost is reduced, the product quality is improved, meanwhile, the environment-friendly requirement is met, and the waterproof and dustproof grade of the product is improved.

Description

Technical Field

[0001] The invention relates to an IMC process, in particular to an IMC process for home appliance decorative parts. Background Art

[0002] With the development of white appliances, display and touch are constantly updated and iterated. Customers have put forward higher requirements for visual effects. In the conventional white appliance touch module process, the touch film and the decorative panel are bonded with double-sided tape, and the touch effect is achieved by touching the front of the decorative panel. The module completed by the bonding process is not only costly, but also uses a large amount of double-sided tape. Double-sided tape is a high molecular polymer, which is difficult to degrade in the natural state and is not conducive to environmental protection. In terms of structure, the waterproof and dustproof level of the bonding process can reach IP68 at most. Since the washing machine is in contact with water for a long time, if water droplets are formed on the surface of the touch film, it is very easy to cause false triggering of the product. If the touch film can be directly injection molded into the decorative panel, it can be completely waterproof and dustproof. Summary of the invention

[0003] The present invention provides an IMC process for home appliance decoration parts to overcome the defects of using a large amount of double-sided adhesives belonging to high molecular polymers in the bonding process of white appliance touch modules in the prior art, which are difficult to degrade in the natural state and are not conducive to environmental protection.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] The present invention discloses an IMC process for household appliance decorative parts, comprising the following steps:

[0006] 1. The aging temperature of PET is 150℃ and the time is 30min.

[0007] 1) Printing of touch film

[0008] The first printing: silver paste, after printing, it is baked at a temperature of 130℃~145℃ for 20min. The shape of the silver paste is consistent with that of the injection molded cover plate.

[0009] The second printing: transparent conductive oil, after printing, it is baked at 135℃ for 5 minutes;

[0010] The third printing: carbon paste, after printing, it is baked at a temperature of 130℃~145℃ for 30min;

[0011] The fourth printing: insulation, after printing, baking is carried out at a temperature of 120℃~145℃ for 30min;

[0012] After printing is completed, stick a piece of single-sided tape at the lead-out line position. The single-sided tape should be 1 to 2 mm into the edge of the adhesive. The function of the single-sided tape is to protect the silver paste at the tail from scratches.

[0013] The fifth printing: varnish, after printing, baking, the temperature is 90℃~100℃, the time is 20min;

[0014] The sixth printing: Adhesive 1, after printing, is baked at a temperature of 90℃~100℃ for 60min;

[0015] The sixth printing: Adhesive 2, after printing, is baked at a temperature of 90℃~100℃ for 60min;

[0016] 2. Printing processing stage

[0017] 1) After the printed materials are inspected and qualified, they are reinforced and bonded to facilitate the connection between the lead wires of the IMC products and the connectors of the customer's computer version. After the above is completed, they are die-cut with a knife die;

[0018] 2) Conduct electrical testing on the film to ensure that the touch function of the touch film is normal;

[0019] 3. IMC injection molding stage

[0020] 1) Place the IMC circuit into the rear cavity of the mold and the IMD decorative film into the front cavity;

[0021] 2) After the injection molding is completed, a stop bar is welded at the outlet of the product tail to prevent the lead wire tail from being pulled during the subsequent customer installation process, resulting in malfunction;

[0022] 3) After the injection molding is completed, the product is processed in the post-processing process, and the foam is attached to the lead-out wire tail tape. The purpose of attaching the foam is to increase the bending resistance of the product;

[0023] 4) Use equipment to test the electrical performance of IMC products, and pack and ship them after they are tested.

[0024] Furthermore, the silver paste is a high tensile silver paste; after the silver paste line is stretched 60% on the PC material using a tensile testing machine, the resistance change rate of the silver paste is within 30%.

[0025] Furthermore, the ink is a transparent conductive ink, which is used to display the pattern of the decorative panel through the transparent buttons.

[0026] Furthermore, the adhesive 1 and the adhesive 2 are printed twice in total, so as to better injection-mold the touch film into the ABS of the plastic cover.

[0027] The beneficial effects achieved by the present invention are: integrating the touch and IMD decorative panels, using adhesive to replace the double-sided tape of the traditional bonding process, reducing product costs and improving product quality, while responding to environmental protection requirements and improving the waterproof and dustproof level of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the conductivity variation diagram of the present invention;

[0029] Figure 2 This is an electrical performance test diagram of the present invention. DETAILED DESCRIPTION

[0030] An IMC process for home appliance decorative parts, comprising:

[0031] 1. Aging of PET (150°C, 30 min).

[0032] 1) Printing of touch film

[0033] The first printing: silver paste, after printing, it is baked (130℃~145℃, 20min). The baking temperature of silver paste cannot be lower than 130℃, otherwise the solvent in the ink cannot be completely volatilized, which will lead to poor adhesion. At the same time, the aging temperature of the material is 150℃. If it is higher than 150℃, the PET of the product will shrink again, affecting the positioning accuracy of the subsequent printing, causing the product to be scrapped. Since the silver paste needs to be consistent with the shape of the injection molded cover plate, there will be a certain amount of stretching and bending, so high-stretch silver paste is required; (After the silver paste line is stretched 60% on the PC material using a tensile testing machine, the resistance change rate is within 30% of the silver paste.)

[0034] The second printing: transparent conductive oil, after printing, baking (135℃, 5min), (using transparent conductive ink, the pattern of the decorative panel can be displayed through the transparent button);

[0035] The third printing: carbon paste, after printing, baking (130℃~145℃, 30min);

[0036] The fourth printing: insulation, baking after printing (120℃~145℃, 30min);

[0037] After printing is completed, stick a piece of single-sided tape at the lead-out line position. The single-sided tape should be 1 to 2 mm into the edge of the adhesive. The function of the single-sided tape is to protect the silver paste at the tail from scratches.

[0038] The fifth printing: varnish, baking after printing (90℃~100℃, 20min);

[0039] The sixth printing: Adhesive 1, after printing, baking (90℃~100℃, 60min);

[0040] The sixth printing: Adhesive 2, after printing, is baked (90℃~100℃, 60min); the adhesive is printed twice to better injection mold the touch film into the ABS of the plastic cover plate. The adhesive is used to replace the double-sided tape of the traditional lamination process, reducing the use of high molecular polymer double-sided tape;

[0041] 2. Printing processing stage

[0042] 1) After the printed product has passed the inspection, it will be reinforced and bonded. The purpose of bonding and reinforcement is to facilitate the connection between the lead wire of the IMC product and the connector of the customer's computer version. After the above is completed, the die is cut with a knife;

[0043] 2) Conduct electrical testing on the film to ensure that the touch function of the touch film is normal;

[0044] 3. IMC injection molding stage

[0045] 1) Place the IMC circuit into the rear cavity of the mold and the IMD decorative film into the front cavity;

[0046] 2) After the injection molding is completed, a stop bar is welded at the outlet of the product tail to prevent the lead wire tail from being pulled during the subsequent customer installation process, resulting in malfunction;

[0047] 3) After the injection molding is completed, the product is processed in the post-processing process, and the foam is attached to the lead-out wire tail tape. The purpose of attaching the foam is to increase the bending resistance of the product;

[0048] 4) Use equipment to test the electrical performance of IMC products, and pack and ship them after they are tested.

[0049] The high tensile silver paste test method is as follows:

[0050] A 0.4 mm wide conductive silver paste curing coating was printed on the PC film at a curing temperature of 130°C for 30 minutes.

[0051] The sample was stretched at a speed of 500 mm / min using a tensile testing machine in a gas environment at 185°C.

Claims

1. An IMC process for home appliance decorative parts, characterized in that: The steps include:

1. The aging temperature of PET is 150℃ and the time is 30min. 1) Printing of touch film The first printing: silver paste, after printing, it is baked at a temperature of 130℃~145℃ for 20min. The shape of the silver paste is consistent with that of the injection molded cover plate. The second printing: transparent conductive oil, after printing, it is baked at 135℃ for 5 minutes; The third printing: carbon paste, after printing, it is baked at a temperature of 130℃~145℃ for 30min; The fourth printing: insulation, after printing, baking, the temperature is 120℃~145℃, the time is 30min; After printing is completed, stick a piece of single-sided tape at the lead-out line position. The single-sided tape should be 1 to 2 mm into the edge of the adhesive. The function of the single-sided tape is to protect the silver paste at the tail from scratches. The fifth printing: varnish, after printing, baking, the temperature is 90℃~100℃, the time is 20min; The sixth printing: Adhesive 1, after printing, is baked at a temperature of 90℃~100℃ for 60min; The sixth printing: Adhesive 2, after printing, is baked at a temperature of 90℃~100℃ for 60min; 2. Printing processing stage 1) After the printed materials are inspected and qualified, they are reinforced and bonded to facilitate the connection between the lead wires of the IMC products and the connectors of the customer's computer version. After the above is completed, they are die-cut with a knife die; 2) Conduct electrical testing on the film to ensure that the touch function of the touch film is normal; 3. IMC injection molding stage 1) Place the IMC circuit into the rear cavity of the mold and the IMD decorative film into the front cavity; 2) Use equipment to test the electrical performance of IMC products, and pack and ship them after they are tested.

2. The IMC process for home appliance decoration parts according to claim 1, characterized in that: The silver paste is a high tensile silver paste; after the silver paste line is stretched 60% on the PC material using a tensile testing machine, the resistance change rate of the silver paste is within 30%.

3. The IMC process for home appliance decoration parts according to claim 1, characterized in that: The ink is a transparent conductive ink, which is used to display the pattern of the decorative panel through the transparent buttons.

4. The IMC process for home appliance decorative parts according to claim 1, characterized in that: The adhesive 1 and the adhesive 2 are printed twice in total, so as to better injection-mold the touch film into the ABS of the plastic cover plate.

5. The IMC process for home appliance decoration parts according to claim 1, characterized in that: After the injection molding of the IMC is completed, a stop bar is welded at the outlet of the product tail to prevent the lead wire tail from being pulled during the subsequent client installation process, resulting in malfunction.

6. The IMC process for home appliance decoration parts according to claim 1, characterized in that: After the injection molding of the IMC injection molding stage is completed, the product is processed in the post-processing stage, and the foam is attached to the lead-out wire tail band. The purpose of attaching the foam is to increase the bending resistance of the product.

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