CN-122002707-A - FPC product and preparation method thereof

Abstract

The invention discloses an FPC product and a preparation method thereof. The manufacturing method comprises the steps of forming a reference structure for positioning steel sheet reinforcement and FR4 reinforcement on an FPC (flexible printed Circuit) splice without reinforcement, sequentially attaching the steel sheet reinforcement and the FR4 reinforcement to corresponding areas of the FPC splice based on the reference structure, performing one-time lamination and then one-time baking solidification on the FPC splice attached with the steel sheet reinforcement and the FR4 reinforcement to finish synchronous bonding fixation of the steel sheet reinforcement and the FR4 reinforcement, so that a solidified FPC splice is obtained, and performing appearance punching on the solidified FPC splice to obtain an FPC product. In the invention, the synchronous bonding and fixing of the two reinforcing materials are finished through one-time lamination and one-time baking and curing, the traditional two independent hot pressing and curing processes are combined into one time, the production efficiency is improved, the auxiliary material consumption of lamination and the energy consumption of baking and curing are saved, and the comprehensive manufacturing cost is reduced.

Inventors

• LI SHOUGANG
• YOU JIAN
• CHEN YONGBAO
• YANG CHENGZONG
• YUAN ZHI
• LI JUN

Assignees

• 台山市精诚达电路有限公司
• OPPO广东移动通信有限公司

Dates

Publication Date

20260508

Application Date

20260407

Claims (10)

1. 1. A method of manufacturing an FPC product, comprising: A standard structure for positioning steel sheet reinforcement and FR4 reinforcement is preformed on the FPC imposition without reinforcement; Based on the reference structure, sequentially attaching the steel sheet reinforcement and the FR4 reinforcement to the corresponding area of the FPC imposition; Pressing the FPC imposition bonded with the steel sheet reinforcement and the FR4 reinforcement for one time and then baking and solidifying for one time to finish synchronous bonding and fixing of the steel sheet reinforcement and the FR4 reinforcement, thereby obtaining solidified FPC imposition; And carrying out shape punching on the solidified FPC makeup to obtain an FPC product.
2. 2. The method of manufacturing according to claim 1, wherein the pre-forming of the reference structure for positioning steel sheet reinforcement and FR4 reinforcement on the non-affixed FPC imposition comprises: Performing first die cutting on the FPC splice without reinforcement so as to punch an outline groove for fitting the reinforcement area reinforced by the steel sheet; And setting a reference mark line for FR4 reinforcement alignment in a waste material area where the FPC imposition is not washed away.
3. 3. The manufacturing method according to claim 2, wherein attaching the steel sheet reinforcement and the FR4 reinforcement to the corresponding areas of the FPC imposition in order based on the reference structure, comprises: identifying the shape of the outer groove through a reinforcing machine to accurately position, so that the steel sheet is reinforced and attached to the reinforcing area; and on the reinforcing machine, positioning through the reference mark line, and bonding the FR4 reinforcement to the FPC corresponding area.
4. 4. The method of claim 1, wherein the press-fit temperature is 170 ℃ to 190 ℃, the press-fit pressure is 70kg/cm 2 to 90kg/cm 2 , and the press-fit time is 240 seconds to 260 seconds.
5. 5. The method according to claim 1, wherein the baking temperature of the baking curing is 165±5 ℃, and the baking time of the baking curing is 90min.
6. 6. The method of manufacturing according to claim 1, wherein the performing of shape die cutting on the cured FPC imposition to obtain an FPC product comprises: And punching the outer contour of each FPC product on the cured FPC splice, and simultaneously cutting out the part of each FR4 reinforcement beyond the outer contour so that the obtained FR4 reinforcement edge is level with the outer contour of the FPC.
7. 7. The method of claim 1, further comprising sequentially performing a cleaning and electrical testing operation on the FPC product after the form die cutting.
8. 8. A method of manufacturing according to claim 3, wherein the identifying the shape of the outer groove by a stiffening machine for accurate positioning to stiffen the steel sheet into the stiffening region comprises: Acquiring an image containing the outer groove through a vision system equipped with a reinforcing machine; Identifying the edge contour of the outer groove in the image, and sucking the steel sheet reinforcement through the mounting mechanism; and driving the mounting mechanism to move based on the edge profile so as to embed the steel sheet reinforcement into the reinforcement area.
9. 9. The FPC product, characterized in that it is produced according to the production method of any one of claims 1 to 8, comprising an FPC imposition, a steel sheet reinforcement and an FR4 reinforcement, both of which are provided on the FPC imposition.
10. 10. The FPC product of claim 9, wherein said FPC imposition is provided with a plurality of external grooves, said steel reinforcement being provided in a reinforcing area formed around said plurality of external grooves.

Description

FPC product and preparation method thereof Technical Field The invention relates to the technical field of flexible circuit boards, in particular to an FPC product and a preparation method thereof. Background In the field of manufacturing of Flexible Printed Circuits (FPC) (Flexible Printed Circuit), in order to meet the differentiated requirements of different areas on rigid support, heat dissipation conduction or grounding shielding, FR4 (FLAME RETARDANT, epoxy glass fiber cloth substrate) reinforcement and steel sheet reinforcement are often required to be attached to the same jointed board of a high-end FPC product. Especially when FR4 reinforcement is required to be strictly flush with the FPC profile and the steel sheet is required to be shrunk-bonded in a specific area (e.g., the grounding area), the conventional process flow is very complicated. At present, strict serial operation is generally adopted for the main stream process of the composite reinforced FPC in the industry, namely, lamination, solidification and shape punching of FR4 reinforcement are sequentially finished, and lamination, lamination and solidification of steel sheet reinforcement are carried out. However, the process has the inherent defects that firstly, the equipment occupation time is long and the production period is obviously prolonged due to two independent lamination and high-temperature baking cycles, secondly, lamination auxiliary materials such as release films and cushion pads are repeatedly consumed, and the energy consumption of secondary curing is added, so that the comprehensive manufacturing cost is high, and thirdly, the difficulty of controlling the dimensional stability of the product can be increased due to multiple heat treatment and mechanical operation. Disclosure of Invention The invention aims to solve the technical problems of low production efficiency and high manufacturing cost caused by two independent pressing and curing processes in the prior art by providing an FPC product and a preparation method thereof. In a first aspect, the present invention provides a method of manufacturing an FPC product. The preparation method comprises the following steps: A standard structure for positioning steel sheet reinforcement and FR4 reinforcement is preformed on the FPC imposition without reinforcement; Based on the reference structure, sequentially attaching the steel sheet reinforcement and the FR4 reinforcement to the corresponding area of the FPC imposition; Pressing the FPC imposition bonded with the steel sheet reinforcement and the FR4 reinforcement for one time and then baking and solidifying for one time to finish synchronous bonding and fixing of the steel sheet reinforcement and the FR4 reinforcement, thereby obtaining solidified FPC imposition; And carrying out shape punching on the solidified FPC makeup to obtain an FPC product. In an alternative embodiment, the pre-forming the datum structure for positioning the steel sheet reinforcement and the FR4 reinforcement on the FPC imposition without the reinforcement comprises: Performing first die cutting on the FPC splice without reinforcement so as to punch an outline groove for fitting the reinforcement area reinforced by the steel sheet; And setting a reference mark line for FR4 reinforcement alignment in a waste material area where the FPC imposition is not washed away. In an alternative embodiment, attaching the steel sheet reinforcement and the FR4 reinforcement to the corresponding areas of the FPC imposition in order based on the fiducial structures, comprises: identifying the shape of the outer groove through a reinforcing machine to accurately position, so that the steel sheet is reinforced and attached to the reinforcing area; and on the reinforcing machine, positioning through the reference mark line, and bonding the FR4 reinforcement to the FPC corresponding area. In an alternative embodiment, the nip temperature of the nip is 170 ℃ to 190 ℃, the pressure of the nip is 70kg/cm 2 to 90kg/cm 2, and the time of the nip is 240 seconds to 260 seconds. In an alternative embodiment, the bake temperature of the bake cure is 165±5 ℃, and the bake time of the bake cure is 90 minutes. In an alternative embodiment, the cured FPC imposition is die cut in shape to obtain an FPC product, comprising: And punching the outer contour of each FPC product on the cured FPC splice, and simultaneously cutting out the part of each FR4 reinforcement beyond the outer contour so that the obtained FR4 reinforcement edge is level with the outer contour of the FPC. In an alternative embodiment, the manufacturing method further comprises the step of sequentially performing cleaning and electrical testing operations on the FPC product after the profile punching is performed. In an alternative embodiment, the identifying the shape of the outer groove by the reinforcing machine for accurate positioning, so as to attach the steel sheet reinforcement in the reinforcing area,