Two-time injection molding process for FPC (Flexible Printed Circuit)

Abstract

The invention discloses a twice injection molding process for an FPC (Flexible Printed Circuit), which comprises the following steps: step 1, preparing a mold and the FPC, the mold being provided with a first injection mold cavity and a second injection mold cavity; secondly, a first injection mold cavity is preheated; step 3, placing the FPC on the first injection mold cavity for first LSR molding; fourthly, the semi-finished product workpiece obtained after first-time injection molding is taken out of the first injection mold cavity; 5, preheating a second injection mold cavity; sixthly, the semi-finished product workpiece is placed on a second injection mold cavity to be subjected to second-time LSR forming; step 7, taking out a formed finished product; thus, through the design of all the steps, LSR forming is sequentially conducted on the first injection mold cavity and the second injection mold cavity through the FPC, so that the outer portion of the FPC is evenly coated with the sizing material, the forming quality of a product is improved, follow-up use of the product is facilitated, usability is good, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the field of FPC molding technology, in particular to an FPC two-time injection molding process. Background Art

[0002] In recent years, electronic devices have become an indispensable tool in people's lives. The functional integration of electronic devices is getting higher and higher, making the overall space size smaller and smaller. FPC circuit boards, as carriers for electrical connections of electronic components in electronic devices, can simplify the manufacture of electronic devices, reduce wiring between electronic parts and reduce costs. In large-scale electronic industrial production, some electronic components of FPC circuit boards usually need to be coated with silicone. Silicone has good electrical insulation and thermal conductivity, plays the role of a thermal conductive medium and has the functions of moisture-proof, dust-proof, corrosion-proof and shock-proof.

[0003] At the same time, the injection molding process refers to the process of making molten raw materials into products of a certain shape through operations such as pressurization, injection, cooling, and separation. There are many types of injection molded products, which are used in various industries, such as electronics, toys, etc.; among some electronic injection molding products, a large proportion of products are injection molded with FPC (Flexible Printed Circuit). The existing FPC molding process mainly completes the silicone jacket coating operation of the FPC by injecting silicone into the mold. However, the existing FPC molding process is poorly designed, and the FPC is prone to uneven silicone coating in the injection mold cavity, resulting in poor product molding, which is not conducive to the subsequent use of the product, poor usability, and a small scope of application.

[0004] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the invention

[0005] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a two-time injection molding process for FPC. Through the design of each step, FPC is used to perform LSR molding in the first injection mold cavity and the second injection mold cavity in sequence to achieve uniform coating of the FPC with rubber on the outside, thereby improving the molding quality of the product, facilitating the subsequent use of the product, and having good usability and a wide range of applications.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A FPC two-shot injection molding process includes the following steps:

[0008] Step 1, preparing a mold and an FPC, wherein the mold has a first injection mold cavity and a second injection mold cavity;

[0009] Step 2, preheating the first injection mold cavity;

[0010] Step 3, placing the FPC on the first injection mold cavity for the first LSR molding;

[0011] Step 4, taking the semi-finished workpiece after the first injection molding out of the first injection mold cavity;

[0012] Step 5, preheating the second injection mold cavity;

[0013] Step 6, placing the semi-finished workpiece on the second injection mold cavity for a second LSR molding;

[0014] Step seven, take out the finished product.

[0015] As a preferred solution, in step 2 and step 5, the first injection mold cavity and the second injection mold cavity are heated respectively by a heating fixture.

[0016] As a preferred solution, in step 2 and step 5, the heating time of the first injection mold cavity and the second injection mold cavity is 1 to 2 minutes.

[0017] As a preferred solution, in step 2, the temperature of the first injection mold cavity is 100 degrees to 110 degrees.

[0018] As a preferred solution, in step five, the temperature of the second injection mold cavity is 110 degrees to 120 degrees.

[0019] As a preferred solution, in step 4, after the semi-finished workpiece is taken out of the first injection mold cavity, the burrs and sprues on the surface of the semi-finished workpiece are removed; in step 7, after the finished product is taken out, the burrs and sprues on the surface of the finished product are removed.

[0020] As a preferred solution, in step one, both the first injection mold cavity and the second injection mold cavity are cleaned by a cleaning tool.

[0021] As a preferred solution, in step three, the FPC is positioned on the first injection mold cavity by a pressing jig.

[0022] As a preferred solution, after the FPC is pressed in the first injection mold cavity, the first injection mold cavity is opened, the pressing jig is taken out, and it is checked whether the FPC is pressed in place, and then the first injection mold cavity is closed to perform the first LSR molding.

[0023] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that it mainly uses the design of each step to sequentially perform LSR molding on the first injection mold cavity and the second injection mold cavity using FPC to achieve uniform coating of the outside of the FPC with rubber, thereby improving the molding quality of the product, facilitating the subsequent use of the product, having good usability and a wide range of applications;

[0024] In addition, the heating fixture is set to keep the rubber on the injection mold cavity warm, thereby ensuring that the rubber can be evenly coated on the FPC. At the same time, the heating temperature of the second injection mold cavity is higher than that of the first injection mold cavity, so as to ensure that the rubber in the first injection mold cavity can be connected with the rubber in the second injection mold cavity, thereby improving the molding quality of the product and having strong practicality;

[0025] Furthermore, the setting of the pressing fixture can support and position the FPC in the corresponding mold cavity, avoiding the movement of the FPC and further improving the molding quality of the product.

[0026] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0028] Please refer to Figure 1 As shown, it shows the specific process of an embodiment of the present invention.

[0029] A FPC two-shot injection molding process includes the following steps:

[0030] Step 1, preparing a mold and an FPC, wherein the mold has a first injection mold cavity and a second injection mold cavity;

[0031] Step 2, preheating the first injection mold cavity;

[0032] Step 3, placing the FPC on the first injection mold cavity for the first LSR molding;

[0033] Step 4, taking the semi-finished workpiece after the first injection molding out of the first injection mold cavity;

[0034] Step 5, preheating the second injection mold cavity;

[0035] Step 6, placing the semi-finished workpiece on the second injection mold cavity for a second LSR molding;

[0036] Step seven, taking out the finished product after molding; in this way, through the design of each step, LSR molding is performed on the first injection mold cavity and the second injection mold cavity in sequence using FPC to achieve uniform coating of the outside of the FPC with rubber, thereby improving the molding quality of the product, facilitating the subsequent use of the product, and having good usability and a wide range of applications.

[0037] In step 2 and step 5, the first injection mold cavity and the second injection mold cavity are heated by the heating jig respectively. Specifically, in step 2 and step 5, the heating time of the first injection mold cavity and the second injection mold cavity is 1 to 2 minutes. In step 2, the temperature of the first injection mold cavity is 100 to 110 degrees. In step 5, the temperature of the second injection mold cavity is 110-120 degrees. Preferably, the temperature of the first injection mold cavity is 105 degrees, and the temperature of the second injection mold cavity is 115 degrees. In this way, the setting of the heating jig can keep the rubber on the injection mold cavity warm, thereby ensuring that the rubber can be evenly coated on the FPC. At the same time, the heating temperature of the second injection mold cavity is greater than that of the first injection mold cavity, so as to ensure that the rubber in the first injection mold cavity can be connected with the rubber in the second injection mold cavity, thereby improving the molding quality of the product and having strong practicality.

[0038] In step one, the first injection mold cavity and the second injection mold cavity are both cleaned by a cleaning tool. In step four, after the semi-finished workpiece is taken out of the first injection mold cavity, the burrs and sprues on the surface of the semi-finished workpiece are removed; in step seven, after the finished product is taken out, the burrs and sprues on the surface of the finished product are removed. This is beneficial to improving the injection molding stability of the FPC in the corresponding mold cavity.

[0039] And, in step three, the FPC is positioned on the first injection mold cavity by a pressing jig. Specifically, after the FPC is pressed in the first injection mold cavity, the first injection mold cavity is opened, the pressing jig is taken out, and it is checked whether the FPC is pressed in place, and then the first injection mold cavity is closed to perform the first LSR molding. In this way, the FPC is supported and positioned in the corresponding mold cavity, which avoids the movement of the FPC and further improves the molding quality of the product.

[0040] The design focus of the present invention is that, mainly through the design of each step, the FPC is used to perform LSR molding in the first injection mold cavity and the second injection mold cavity in sequence, so as to achieve that the outside of the FPC is evenly coated with the rubber material, thereby improving the molding quality of the product, facilitating the subsequent use of the product, having good usability and a wide range of application;

[0041] In addition, the heating fixture is set to keep the rubber on the injection mold cavity warm, thereby ensuring that the rubber can be evenly coated on the FPC. At the same time, the heating temperature of the second injection mold cavity is higher than that of the first injection mold cavity, so as to ensure that the rubber in the first injection mold cavity can be connected with the rubber in the second injection mold cavity, thereby improving the molding quality of the product and having strong practicality;

[0042] Furthermore, the setting of the pressing fixture can support and position the FPC in the corresponding mold cavity, avoiding the movement of the FPC and further improving the molding quality of the product.

[0043] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A two-shot FPC injection molding process, characterized in that: The following steps are included: Step 1, preparing a mold and an FPC, wherein the mold has a first injection mold cavity and a second injection mold cavity; Step 2, preheating the first injection mold cavity; Step 3, placing the FPC on the first injection mold cavity for the first LSR molding; Step 4, taking the semi-finished workpiece after the first injection molding out of the first injection mold cavity; Step 5, preheating the second injection mold cavity; Step 6, placing the semi-finished workpiece on the second injection mold cavity for a second LSR molding; Step seven, take out the finished product.

2. The FPC two-shot injection molding process according to claim 1, characterized in that: In step 2 and step 5, the first injection mold cavity and the second injection mold cavity are heated respectively by a heating fixture.

3. The FPC two-shot injection molding process according to claim 1, characterized in that: In step 2 and step 5, the heating time of the first injection mold cavity and the second injection mold cavity is 1 to 2 minutes.

4. The FPC two-shot injection molding process according to claim 1, characterized in that: In step 2, the temperature of the first injection mold cavity is 100 degrees to 110 degrees.

5. The FPC two-shot injection molding process according to claim 1, characterized in that: In step five, the temperature of the second injection mold cavity is 110 degrees to 120 degrees.

6. The FPC two-shot injection molding process according to claim 1, characterized in that: In step 4, after the semi-finished workpiece is taken out of the first injection mold cavity, the burrs and sprues on the surface of the semi-finished workpiece are removed; in step 7, after the finished product is taken out, the burrs and sprues on the surface of the finished product are removed.

7. The FPC two-shot injection molding process according to claim 1, characterized in that: In step one, both the first injection mold cavity and the second injection mold cavity are cleaned by a cleaning tool.

8. The FPC two-shot injection molding process according to claim 1, characterized in that: In step three, the FPC is positioned on the first injection mold cavity by a pressing jig.

9. The FPC two-shot injection molding process according to claim 8, characterized in that: After the FPC is pressed in the first injection mold cavity, the first injection mold cavity is opened, the pressing jig is taken out, and it is checked whether the FPC is pressed in place, and then the first injection mold cavity is closed to perform the first LSR molding.

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