CN112967847A

CN112967847A - Manufacturing method of multi-end tapping FFC (flexible flat cable)

Info

Publication number: CN112967847A
Application number: CN202110148102.8A
Authority: CN
Inventors: 屠厚春; 唐恒
Original assignee: Jingshi Electronics Technology Co ltd Suzhou
Current assignee: Jingshi Electronics Technology Co ltd Suzhou
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-06-15
Anticipated expiration: 2041-02-03
Also published as: CN112967847B

Abstract

The invention relates to the technical field of flexible flat cables, in particular to a method for manufacturing a multi-end tapping FFC flat cable, which comprises the steps of paying off, straightening, calendering, punching a glue film, press forming, slitting, cutting to a fixed length, cutting to obtain a plurality of tapping lines, and wrapping a glue strip at the tail end of the slitting part; finally, folding processing is carried out, during punching processing, an exposed hole and a folding line hole are punched, during folding, the center line of the short edge of the folding line hole is taken as a folding line, the branch connection line is bent towards the glue film surface where the folding line hole is located to form a folding angle, and bonding and shaping are carried out at the folding angle; the invention is not suitable for crushing the conductor when folding.

Description

Manufacturing method of multi-end tapping FFC (flexible flat cable)

Technical Field

The invention relates to the technical field of flexible flat cables, in particular to a method for manufacturing a multi-end tapping type FFC flat cable.

Background

A Flexible Flat Cable (FFC) is a signal transmission component, which has the advantages of Flexible at will and high signal transmission capability, so it is widely used in many electronic products and also in new energy vehicles.

Generally, the Flexible flat cable has a structure in which a plurality of metal conductors are respectively coated with insulating layers on the upper surface and the lower surface of the metal conductors, and contacts at the front end and the rear end of each metal conductor are exposed to the outside, so that the Flexible flat cable has a transmission function.

In the field of new energy automobiles, automobile functions are continuously increased, electronic control technology is generally applied, more and more electric parts are provided, the number of circuits and power consumption on the automobiles are obviously increased, automobile wire harnesses need to adapt to vehicle multifunctionalization and diversified user demands, then automobile body wiring is huge, processing and assembling processes are complex, a common FFC (flexible flat cable) is connected between one to one and two devices, in order to complete connection of a plurality of devices, a plurality of branch wires can be separated from one end of the FFC, the internal structure of the new energy automobile is complex and changeable, contact between the wires and other elements is reduced, a wire body needs to be folded, a folded angle is formed, when the FFC is folded, wrinkles cannot occur on an insulating adhesive film on the inner side of a folded position, and in addition, a metal conductor in the wire harness is a thin metal after being pressed and extended, the metal conductor at the broken part is easily crushed and even broken due to two reasons.

Disclosure of Invention

In view of the above, the present invention is directed to overcome the defects in the prior art, and provides a method for manufacturing a multi-end tapped FFC cable, which avoids the metal conductor at the broken portion from being damaged by pressure.

The invention discloses a method for manufacturing a multi-end tapping type FFC flat cable, which comprises the following steps of:

s1, paying off and straightening: leading out a lead wire required by manufacturing from a pay-off rack and straightening;

s2, rolling the long straight wire of S1 to form a flat wire;

s3, punching of the adhesive film: the glue film comprises an upper glue film and a lower glue film, an exposure hole and a fold line hole are punched on the upper glue film and/or the lower glue film according to specifications, the exposure hole and the fold line hole are square holes, the length direction of the exposure hole is perpendicular to the length direction of the glue film, the interval between the exposure holes is consistent, the length direction of the fold line hole has an angle alpha compared with the length direction of the glue film, and alpha is more than 0 degree and less than 90 degrees;

s4, press-forming: the upper adhesive film, the plurality of flat wires and the lower adhesive film are pressed together in an up-and-down contraposition mode through a hot press, and the plurality of flat wires are arranged between the upper adhesive film and the lower adhesive film in parallel side by side to form a multi-core cable;

s5, slitting and fixed-length cutting: dividing the semi-finished product subjected to the hot press molding in the step S4 into long cables with specified core number, and cutting the obtained long cables at the exposed holes to obtain short cables;

s6, dividing the short cable obtained in the step S5 from one end by the number of cores occupied by the holes of the broken lines, cutting to obtain a plurality of division lines, and wrapping adhesive tapes at the tail ends of the cutting positions;

s8, discount: and spraying insulating glue at the broken line hole of the branch line, taking the central line of the short edge of the broken line hole as a broken line, bending the branch line towards the glue film surface where the broken line hole is positioned to form a folded angle, and bonding and shaping at the folded angle.

Further, the angle α in S3 is 45 °.

Further, step S4 includes spraying hot melt adhesive on the surface of the upper adhesive film opposite to the lower adhesive film before laminating.

Further, in S5, the two ends of the flat wire are exposed through the exposure holes to form a gold finger, and the gold finger is subjected to plasma treatment before S6 is performed to remove residual glue on the gold finger.

Furthermore, according to the required number of times of buckling of tapping line, can correspond on the same tapping line and set up a plurality of broken line holes, just the broken line hole only sets up at same layer glued membrane.

The invention has the beneficial effects that: the invention discloses a method for manufacturing a multi-end tapping FFC (flexible flat cable), which is characterized in that when an upper adhesive film and a lower adhesive film are punched, not only are exposed holes at positions convenient for exposing flat wires punched, but also wire folding holes are punched, when a subsequent folding process is carried out, a branch wire is folded along the center of a short edge of each wire folding hole, the adhesive film at the position is not easy to wrinkle, and the risk that the flat wires at the position are bent and crushed is reduced; in addition, because the spraying of the insulating cement that the chamber of folding a book goes on to broken line hole department is handled, avoids the flat wire short circuit of this department, and the broken angle department after the insulating cement will be folded simultaneously bonds the design, prevents to divide the wiring to be buckled repeatedly and lead to the flat wire fracture.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a schematic structural diagram of an embodiment of the present invention when it is not folded;

FIG. 2 is a schematic structural diagram of the folded optical fiber according to the embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view at AA in FIG. 2;

FIG. 4 is a schematic structural diagram of a second embodiment of the present invention without folding;

fig. 5 is a schematic structural diagram after folding according to the second embodiment of the present invention.

Description of reference numerals: the device comprises a flat lead 1, an upper adhesive film 2, a lower adhesive film 3, a fold line hole 4, a tapping line 5 and an adhesive tape 6.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1-3, in the method for manufacturing a multi-end tapped FFC flat cable in this embodiment, first, a plurality of wires required for manufacturing are led out from a pay-off stand and straightened to form a long straight wire, and the long straight wire is rolled on a rolling machine to form a flat wire 1; the production method comprises the steps of punching an upper adhesive film 2 and a lower adhesive film 3 required by production, punching exposed holes on the upper adhesive film 2 or the lower adhesive film 3 according to specifications according to requirements of customers, or punching square exposed holes on the upper adhesive film 2 and the lower adhesive film 3 simultaneously, wherein the length direction of the exposed holes is perpendicular to the length direction of the adhesive films and the intervals between the exposed holes are consistent, square broken line holes 4 are punched simultaneously, the length direction of the broken line holes 4 is provided with an angle alpha (namely the included angle between the central line of the short side of the broken line hole 4 and the length direction of the adhesive films) compared with the length direction of the adhesive films, the angle alpha is related to the folding angle of a subsequent sub-connection line 5, 0 degree is larger than alpha and smaller than 90 degrees according to needs, the angle of alpha in the embodiment is 45 degrees, and the folding angle after folding is a.

Pressing an upper adhesive film 2, a flat wire 1 and a lower adhesive film 3 into a whole through a hot press, arranging a plurality of flat wires 1 between the upper adhesive film 2 and the lower adhesive film 3 in parallel side by side to form a multi-core cable, wherein exposed holes in the upper adhesive film 2 and the lower adhesive film 3 need to be aligned with each other, the side edges of the flat wires 1 are exposed at the exposed holes, so that golden fingers electrically connected with external equipment can be obtained conveniently, a fold line hole 4 corresponds to the plurality of flat wires 1 after pressing, and the flat wires 1 corresponding to the same fold line hole 4 can be regarded as a group in the subsequent process; next, dividing the semi-finished product after hot press forming into long cables with specified core number by the prior art, cutting the obtained long cables at the exposed holes to obtain short cables with equal length, taking the central line of the short edge of the exposed hole as a cutting line during cutting, obtaining golden fingers at two ends of the short cables after cutting, and adopting plasma treatment on the golden fingers to gasify residual glue in order to eliminate residual glue on the golden fingers and avoid bad contact of the golden fingers; cutting the same group of flat wires 1 corresponding to the same folding line hole 4 from one end to obtain a dividing line 5, wherein the other end still keeps a connection state, and the size of the folding line hole 4 needs to be controlled when the folding line hole 4 is punched because the number of cores (namely the number of the flat wires 1) occupied by the dividing line 5 is consistent with the number of cores corresponding to the folding line hole 4, and the sizes of the folding line holes 4 corresponding to different dividing lines 5 can be different, so that the dividing line 5 with different core numbers is formed, and in order to avoid the tearing of the dividing line 5 at a cutting position, the tail end of the cutting position needs to be wrapped with a rubber strip 6; next, insulating glue is sprayed at the position of a broken line hole 4 of the branch line 5, short circuit between the flat conductors 1 is avoided, the broken line is formed by bending the branch line 5 towards the glue film surface where the broken line hole 4 is located by taking the middle line of the short side of the broken line hole 4 as a broken line, and the insulating glue can also play a role in bonding and shaping at the broken angle.

In order to improve the bonding capacity between the upper adhesive film 2 and the lower adhesive film 3, hot melt adhesive is sprayed on the opposite surfaces of the upper adhesive film 2 and the lower adhesive film 3 before lamination.

Example 2

As shown in fig. 4-5, according to the needs of actual conditions, the same tapping line 5 may need to be folded many times, and therefore, the same tapping line 5 can be provided with a plurality of folding holes 4, specifically, when punching, a plurality of folding holes 4 corresponding to the same tapping line 5 are cut on the upper adhesive film 2 or the lower adhesive film 3, and when folding, the folding holes 4 on the same tapping line 5 are bent in different directions, because the folding holes 4 are concentrated on the adhesive film on the same side, the adhesive film on the other side is relatively kept complete, and the overall mechanical strength of the wire rod can be ensured.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. A manufacturing method of a multi-end tapping type FFC flat cable is characterized by comprising the following steps:

s2, rolling the long straight wire of S1 to form a flat wire;

2. The method of manufacturing a multi-tap FFC ribbon cable of claim 1, wherein: the angle α in S3 was 45 °.

3. The method of manufacturing a multi-tap FFC ribbon cable of claim 1, wherein: s4, spraying hot melt adhesive on the surface of the upper adhesive film opposite to the lower adhesive film before pressing.

4. The method of manufacturing a multi-tap FFC ribbon cable of claim 1, wherein: in S5, the two ends of the flat wire are exposed through the exposure holes to form a gold finger, and before S6, the gold finger is subjected to plasma treatment to remove residual glue on the gold finger.

5. The method of manufacturing a multi-tap FFC ribbon cable of claim 1, wherein: according to the required number of times of buckling of tapping line, can correspond on the same tapping line and set up a plurality of broken line holes, just broken line hole only sets up at same layer glued membrane.