CN118658674A - A bending-resistant flexible flat cable and its preparation method and repair method - Google Patents
A bending-resistant flexible flat cable and its preparation method and repair method Download PDFInfo
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- CN118658674A CN118658674A CN202410691155.8A CN202410691155A CN118658674A CN 118658674 A CN118658674 A CN 118658674A CN 202410691155 A CN202410691155 A CN 202410691155A CN 118658674 A CN118658674 A CN 118658674A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
- C09J123/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C09J123/0853—Vinylacetate
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/10—Homopolymers or copolymers of propene
- C09J123/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/08—Flat or ribbon cables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laminated Bodies (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a bending-resistant flexible flat cable, a preparation method and a repair method thereof, which relate to the technical field of flexible flat cable preparation, hot melt adhesive is coated on base fabric, and (3) making at least part of the hot melt adhesive permeate into the aperture of the base material cloth to obtain an insulating film, and then rolling the insulating film and the conductor to obtain the polyester fiber plain cloth. According to the bending-resistant flexible flat cable, the ultrathin polyester fiber cloth is selected as the base material, and the complex interlocking structure formed by the interface of the base material and the hot melt adhesive is utilized, so that the slippage of the adhesive layer in the FFC forming process is reduced, and the problems of shrinkage, falling-off and the like of the adhesive layer are effectively solved.
Description
Technical Field
The invention relates to the technical field of flexible flat cable preparation, in particular to a bending-resistant flexible flat cable, and a preparation method and a repair method thereof.
Background
The flexible flat cable (F l exib l e F l at Cab l e, FFC) has the advantages of softness, easiness in bending, thin thickness, small volume, simplicity in connection, convenience in disassembly, easiness in solving electromagnetic shielding (EMI) and the like, and the number and the distance of the wires can be arbitrarily selected, so that the wiring is convenient, the volume of an electronic product is reduced, the cost is reduced, and the efficiency is improved. With the development of automobile intellectualization, the number of automobile electronic devices is increased, the consumption of data transmission lines is increased, and the weight reduction of wire harnesses is also more and more important for the reduction of energy consumption of a bicycle. The development of FFC promotes the development of automobile wire harness lightening, but also puts forward higher requirements on the performance of the coating material, and the development of FFC promotes the development of automobile wire harness lightening, but also puts forward higher requirements on the performance of the coating material, excellent bending resistance and the like.
FFC branch wiring is usually formed by bending, and the bending position of the wire has the risk of layering of glue and film, glue and copper wires in a long-term severe environment, so that leakage burning out of the wire causes the risk of starting a protection program to stop working, short-circuiting, even causing fire to cause explosion. The film commonly used for FFC is generally prepared by coating a hot melt adhesive with a PET film as a base material, wherein a tackifying layer is needed to be matched for use, however, due to the reasons of shrinkage, viscosity reduction, stress caused by bending and the like of the material, the degumming of the base material and the hot melt adhesive is easy to cause, so that potential safety hazards are brought, and the application of the film in an automobile power battery is limited; if the base material is not used, on one hand, the simple hot melt adhesive has softer texture and insufficient stiffness, and is easy to cause the slippage of the adhesive, uneven thickness, deformation of the leather film and the like in the hot pressing process; secondly, if a base material is not used, the mechanical properties of the material are difficult to meet the use requirements.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a bending-resistant flexible flat cable and a preparation method thereof.
The technical scheme of the invention is as follows:
A preparation method of a bending-resistant flexible flat cable comprises the steps of coating hot melt adhesive on base material cloth, enabling at least part of the hot melt adhesive to permeate into the aperture of the base material cloth to obtain an insulating film, and then rolling the insulating film and a conductor to obtain the bending-resistant flexible flat cable.
Preferably, the thickness of the base fabric is 20-50 mu m, the fiber diameter is 10-25 mu m, the pores of the base fabric are 0.2-2 mu m, and the base fabric is polyester fiber plain cloth.
Preferably, the coating method is performed by means of knife coating, film coating or casting.
Preferably, the hot melt adhesive is thermally processed before being coated, the thermal processing temperature is 150-300 ℃, and the hot melt adhesive is 500-5000cps at the thermal processing temperature.
Preferably, the hot melt adhesive is at least one of ethylene-vinyl acetate copolymer, polypropylene, polyester, polyurethane and polyamide.
Preferably, the hot melt adhesive penetrates into the pore diameter of the base fabric to a depth of 10-20 μm.
Preferably, the thickness of the outer adhesive layer of the base fabric is 50-100 mu m, and the thickness of the conductor wire is 90-110 mu m.
Preferably, the rolling comprises pre-rolling and main rolling, wherein the temperature of the pre-rolling is 120-160 ℃, the temperature of the main rolling is 140-200 ℃, and the rolling pressure is 0.1-0.3MPa.
Preferably, the base fabric is corona treated prior to the hot melt adhesive being applied to the base fabric.
The invention also discloses a bending-resistant flexible flat cable which is prepared by the preparation method.
The invention also discloses a repair method of the bending-resistant flexible flat cable, which comprises the steps of dissolving the hot melt adhesive in a solvent to prepare hot melt adhesive solution with the viscosity of 50-500 cps, coating the hot melt adhesive solution on the surface layer of the substrate in the degumming area, and then placing the substrate in a vacuum environment to enable the hot melt adhesive to permeate into the degumming area for curing.
The beneficial effects of the invention are as follows:
(1) According to the preparation method of the bending-resistant flexible flat cable, the ultrathin polyester fiber cloth is selected as the base material, and the complex interlocking structure formed by the base material and the hot melt adhesive interface is utilized, so that the slippage of the adhesive layer in the FFC forming process is reduced, and the problems of shrinkage, falling-off and the like of the adhesive layer are effectively solved.
(2) The bending-resistant flexible flat cable prepared by the invention can more conveniently exert the soft characteristic of the hot melt adhesive in the bending process, and simultaneously, the network structure can better release the stress of the FFC in the bending process, thereby realizing more beneficial bending-resistant performance.
(3) According to the repair method of the bending-resistant flexible flat cable, disclosed by the invention, if the base material and the adhesive layer fall off and are damaged in the long-term use process, the adhesive can be repaired through the surface layer pores.
Drawings
Fig. 1 is a schematic view of the FFC structure.
Detailed Description
As shown in fig. 1, the present invention provides an embodiment: a preparation method of a bending-resistant flexible flat cable comprises the steps of coating hot melt adhesive on base material cloth, enabling the hot melt adhesive to permeate into the aperture of the base material cloth to obtain an insulating film, and then rolling the insulating film and a conductor to obtain the bending-resistant flexible flat cable. According to the invention, the complex interlocking structure formed by the substrate cloth and the hot melt adhesive interface is utilized, so that the slippage of the adhesive layer in the FFC (flexible flat cable) forming process is reduced, and the problems of shrinkage, falling-off and the like of the adhesive layer in the prior art are solved; the hot melt adhesive is combined with the fibers, part of the fibers are embedded into the hot melt adhesive, and the hot melt adhesive is used as a continuous phase to form an interlocking structure; there is a significant difference from the direct interfacial bonding of conventional hot melt adhesives to PET film substrates.
In some embodiments, the thickness of the base fabric is 20-50 μm, which may be specifically 20 μm, 25 μm, 30 μm, 40 μm or 50 μm; the fiber diameter is 10-25 μm, and can be 10 μm, 15 μm, 20 μm or 25 μm; the pores of the substrate are 0.2-2 μm, and may be specifically 0.2 μm, 0.5 μm,1 μm, 1.5 μm, 1.8 μm or 2 μm; the base material cloth is fiber cloth composed of fibers, if the pore space of the fiber cloth is too large, hot melt adhesive can infiltrate into the whole fiber layer, on one hand, the bonding layer is too thick and is not beneficial to bending, and the adhesive dosage needs to be increased, on the other hand, the subsequent repair is not beneficial; if the fiber cloth has too small pores, the hot melt adhesive has the problems of small penetration depth or incomplete penetration, thereby affecting the bending resistance of the FFC; if the fiber diameter is larger, the specific surface area of the fiber cloth is increased, the bonding surface is reduced, the interlocking structure is reduced, the bending performance is unfavorable, if the fiber diameter is smaller, the spinning cost is increased, and the control of the pore size of the fiber base material cloth is more difficult. Therefore, the pores of the base fabric are 0.2-2 μm, and the fiber diameter in the base fabric is 10-25 μm, so that the bending resistance effect required by the present application can be better realized.
The base cloth is polyester fiber plain cloth, and compared with the traditional polyester fiber membrane material, the fiber of the fiber cloth and the hot melt adhesive form more dispersed and uniform combination, and the fibers are independent and do not interfere with each other, so that the release of stress in the bending process is facilitated, and the diffusion of a local failure structure can be effectively prevented; and thus eventually exhibits excellent bending resistance.
In some embodiments, the coating process is by knife coating, curtain coating, or casting.
In some embodiments, the hot melt adhesive is thermally processed prior to coating, the thermal processing temperature is 150-300 ℃, specifically can be 150 ℃, 180 ℃, 200 ℃, 220 ℃, 250 ℃ or 300 ℃, and the hot melt adhesive is 500-5000cps, specifically can be 500cps, 1000cps, 1500cps, 2000cps, 2500cps, 3000cps, 3500cps, 4000cps, 4500cps or 5000cps. The hot melt adhesive referred to in the present application is a viscosity at a hot working temperature, i.e., a viscosity corresponding to a temperature of 150 to 300 ℃.
In some embodiments, the hot melt adhesive is at least one of ethylene-vinyl acetate copolymer, polypropylene, polyester, polyurethane, polyamide, it being understood that the hot melt adhesive may specifically be ethylene-vinyl acetate, polypropylene, polyester, polyurethane, or polyamide alone; it may also be at least 2 of ethylene-vinyl acetate, polypropylene, polyester, polyurethane, polyamide.
In some embodiments, the depth of penetration of the hot melt adhesive into the pore size of the base fabric is controlled to be 10-20 μm, which may be 10 μm, 12 μm, 15 μm, 18 μm or 20 μm in particular. If the depth is too small, the bonding surface of the hot melt adhesive and the base fabric is small, the interlocking structure is not firm enough, and the bonding force is affected; if the depth is too large, i.e. the bonding layer is thick, larger stress is formed in the bending process, and the bending resistance is adversely affected. Therefore, the penetration depth of the hot melt adhesive into the pore diameter of the base fabric is controlled to be 10-20 mu m, so that the bending resistance effect required by the application can be better realized.
In some embodiments, the thickness of the outer adhesive layer of the base fabric is 50-100 μm, and may be specifically 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm; the thickness of the conductor wire is 90-110 μm, and can be 90 μm, 95 μm, 100 μm, 105 μm or 110 μm; if the thickness of the adhesive layer is too small, the lead is possibly coated incompletely, so that the FFC performance is unqualified; if the thickness is too large, the cost and weight will be increased. The conductor line thickness is a conventional choice, and the selection of the glue line thickness is based on the conductor line thickness.
In some embodiments, the rolling includes pre-rolling and main rolling, wherein the pre-rolling is performed at a temperature of 120-160 ℃, specifically 120 ℃, 130 ℃, 140 ℃, 150 ℃, or 160 ℃, the main rolling is performed at a temperature of 140-200 ℃, specifically 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, or 200 ℃, and the rolling pressure is 0.1-0.3Mpa, specifically 0.1Mpa, 0.2Mpa, or 0.3Mpa.
In some embodiments, the substrate cloth is corona treated prior to the hot melt adhesive being applied to the substrate cloth by: the PET base cloth was placed in a corona discharge apparatus and subjected to corona oxidation treatment. Under the bombardment of high-energy ions, the free energy and roughness of the surface of the PET fiber can be increased. The surface energy of the base material cloth fiber is increased, the roughness of the microstructure is increased, the adhesive force between the base material cloth fiber and the hot melt adhesive is increased, and the interface combination can be effectively enhanced.
The invention also discloses a bending-resistant flexible flat cable, which is prepared by adopting the preparation method; the bending-resistant flexible flat cable prepared by the invention can more conveniently exert the soft characteristic of the hot melt adhesive in the bending process, and simultaneously, the network structure can better release the stress of the FFC in the bending process, thereby realizing more beneficial bending-resistant performance.
The invention also discloses a repair method of the bending-resistant flexible flat cable, if the substrate and the adhesive layer are degummed, hot melt adhesive solution of the same substrate as the adhesive layer can be prepared, the solution viscosity is 50-500 cps, a proper volume of solution is coated on the surface layer of the degummed substrate, then the substrate is placed in a vacuum box, the vacuum degree is-0.2-0.1 MPa, the hot melt adhesive solution permeates into a damaged interlocking structure, and a small amount of solvent can dissolve part of the interlocking structure, so that the hot melt adhesive solution and the hot melt adhesive are easily combined into a whole, thereby achieving the purpose of repair.
Embodiments of the present invention are described in detail below. The following examples are illustrative only and are not to be construed as limiting the invention. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
Example 1
(1) EVA (ethylene-vinyl acetate copolymer) hot melt adhesive is used as a raw material, base cloth (made of polyester fibers with the diameter of 20 mu m) is selected, the thickness of the base cloth is 35 mu m, and the pores of the base cloth are 0.5 mu m;
(2) Firstly, placing a base material cloth in a corona discharge device, carrying out corona treatment, enabling a corona value to reach 38 dynes, and then coating a hot melt adhesive on one side of the base material cloth in a blade coating mode, wherein the blade coating temperature is 150 ℃, and the melt viscosity of the hot melt adhesive is about 1000cps;
(3) Through the control of the temperature, the viscosity and the base fabric, the single-sided penetration depth of the melt of the hot melt adhesive in the base fabric is 18 mu m;
(4) The thickness of the outer adhesive layer of the base material cloth is 70 mu m by adjusting the melt flow and the coating speed of the hot melt adhesive, so that an insulating film is obtained;
(5) The FFC is formed by pressing upper and lower layers of insulating films and a conductor copper bar wire with the thickness of 100 mu m in the middle, when the FFC is rolled, the outer adhesive layers of the two insulating films are close to the conductor copper bar wire, wherein the temperature of a pre-pressing roller is 100 ℃, the temperature of a main pressing roller is 125 ℃, and the rolling pressure is 0.2MPa.
The EVA-based bending-resistant FFC can be prepared through the method.
Example 2
(1) The PP (polypropylene) hot melt adhesive is used as a raw material, and base cloth (made of polyester fibers with the diameter of 15 mu m) is selected to have the thickness of 25 mu m, wherein the pores of the base cloth are 1.5 mu m;
(2) Firstly, placing a base material cloth in a corona discharge device, carrying out corona treatment, enabling a corona value to reach 38 dynes, and then coating hot melt adhesive on one side of the base material cloth in a blade coating mode, wherein the blade coating temperature is 230 ℃, and the melt viscosity is about 1500cps;
(3) Through the control of the temperature, the viscosity and the base material, the single-sided penetration depth of the melt in the base material cloth is 12 mu m;
(4) The thickness of the outer adhesive layer of the base material is 80 mu m by adjusting the flux and the coating speed, so as to obtain an insulating film;
(5) The FFC is formed by pressing an upper insulating film layer, a lower insulating film layer and a conductor copper bar wire with the thickness of 100 mu m in the middle, wherein the outer adhesive layers of the two insulating films are close to the conductor copper bar wire when in rolling, the temperature of a pre-pressing roller is 150 ℃, the temperature of a main pressing roller is 180 ℃, and the pre-pressing pressure is 0.2MPa;
(6) The PP-based bending-resistant FFC can be prepared through the method.
Example 3
(1) PES (polyester) hot melt adhesive is used as a raw material, the thickness of the selected base fabric (the material is polyester fiber, the diameter of the polyester fiber is 15 mu m) is 25 mu m, and the pores of the base fabric are 1.5 mu m;
(2) Firstly, placing a base material cloth in a corona discharge device, carrying out corona treatment, enabling a corona value to reach 38 dynes, and then coating hot melt adhesive on one side of the base material cloth in a blade coating mode, wherein the blade coating temperature is 190 ℃, and the melt viscosity is about 1200cps;
(3) Through the control of the temperature, the viscosity and the base material, the single-sided penetration depth of the melt in the base material cloth is 15 mu m;
(4) The thickness of the outer adhesive layer of the base material is 80 mu m by adjusting the flux and the coating speed, so as to obtain an insulating film;
(5) The FFC is formed by pressing an upper insulating film layer, a lower insulating film layer and a conductor copper bar wire with the thickness of 100 mu m in the middle, wherein the outer adhesive layers of the two insulating films are close to the conductor copper bar wire when in rolling, the temperature of a pre-pressing roller is 150 ℃, the temperature of a main pressing roller is 180 ℃, and the pre-pressing pressure is 0.2MPa;
(6) The PES-based bending-resistant FFC can be prepared through the method.
Example 4 (repair test)
(1) The PP-based bending-resistant FFC prepared in example 2 is placed on a bending-resistant testing machine for testing until the FFC is partially degummed;
(2) Dissolving PP in xylene to obtain 100cps polypropylene solution, coating sufficient polypropylene solution on the surface layer of the substrate in the degumming area, and then placing in a vacuum environment of-0.1 MPa to enable the solution to completely permeate the degumming area;
(3) And finishing the repairing step after the solvent is volatilized, and obtaining the repaired PP-based bending-resistant FFC.
Comparative example 1 (base fabric-free)
(1) Taking PP (polypropylene) hot melt adhesive as a raw material, and carrying out tape casting to form a film by a tape casting machine, wherein the tape casting temperature is 210 ℃;
(2) Regulating the casting speed to realize the thickness of the adhesive layer of 80 mu m;
(3) The FFC is formed by pressing an upper layer of insulating film without a base material, a lower layer of insulating film without a base material and a conductor copper bar wire with the thickness of 100 mu m in the middle, wherein the temperature of a pre-pressing roller is 150 ℃, the temperature of a main pressing roller is 180 ℃, and the pre-pressing pressure is 0.2MPa;
(4) The FFC without the base material can be prepared by the method.
Comparative example 2
The comparative example was a modification of example 2 in which a base fabric (polyester fiber, 30 μm in diameter) was used to give a thickness of 50. Mu.m, and the remainder was the same as in example 2.
Comparative example 3
The comparative example was a modification of example 2, specifically, the pores of the base fabric were 0.1. Mu.m, and the remainder was the same as in example 2.
Comparative example 4
The comparative example was a modification of example 2, specifically, the pores of the base fabric were 4 μm, and the remainder was the same as in example 2.
Comparative example 5
This comparative example was a variation on the basis of example 2, specifically a melt viscosity of 8000cps, with the remainder being the same as example 2.
Comparative example 6
This comparative example was a variation on the basis of example 2, specifically a melt viscosity of 200cps, with the remainder being the same as example 2.
The advantages of the present technique are illustrated by the results associated with examples 1-4, comparative examples 1-6: and the bending times are more than 10 times, and the product is qualified without glue opening. The test results are shown in Table 1.
The method for testing the bending resistance times comprises the following steps: and (3) adopting a bending tester to carry out 180-degree bending test (bending radius is 0.5 mm) on the FFC main body, and bending for 10 times is not allowed to occur.
The method for testing the folding times after double 85 tests comprises the following steps: and (3) carrying out 180-degree bending test (bending radius is 0.5 mm) on the FFC main body by adopting a bending tester after the FFC main body is placed for 1000 hours at the temperature of 85 ℃ and the humidity of 85RH, wherein the FFC main body is bent for 10 times, and the FFC main body is not allowed to crack.
Table 1 results of performance tests of examples and comparative examples
From the table, the embodiment 1-3 has the advantages that the bending resistance times are up to more than 48 times, the appearance is smooth, and the adhesive is not degummed, mainly because the ultrathin polyester fiber cloth is selected as the base material, the complex interlocking structure formed by the interface of the base material and the hot melt adhesive is utilized, the slippage of the adhesive layer in the FFC forming process is reduced, and the problems of shrinkage, falling-off and the like of the adhesive layer are effectively solved; the deformation of comparative example 1 is caused by the fact that the fiber cloth substrate is not supported, and the cooling crystallization shrinkage is easy to generate deformation in the hot-pressing cooling process; in contrast, in comparative example 2, the increase in fiber diameter reduced the specific surface area and thus the interlocking structure, and the bending resistance was significantly reduced, and failed after double 85 test. The pore of the same substrate is too small to influence the penetration of the hot melt adhesive, which is not beneficial to the formation of an interlocking structure, so that the bending times are obviously reduced, and the pore is too large to increase the penetration depth, but the bending stress is too large, so that the degumming is easy to cause. After double 85 tests, the adhesive is bent for 6 times, and the adhesive is disqualified. Secondly, the size of the hot melt adhesive influences the penetration depth, and the penetration depth is too small, so that the bonding surface of the hot melt adhesive and the base fabric is small, the interlocking structure is not firm enough, and the bonding force is influenced; if the penetration depth is too large, i.e. the bonding layer is thick, larger stress is formed in the bending process, and the bending resistance is adversely affected.
The foregoing examples have shown only the preferred embodiments of the invention, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be pointed out that various other corresponding changes and modifications can be made by those skilled in the art in light of the above description of the technical solution and the idea, and all such changes and modifications are intended to be within the scope of the invention as defined in the appended claims.
Claims (10)
1. A preparation method of a bending-resistant flexible flat cable is characterized in that hot melt adhesive is coated on base material cloth, so that at least part of the hot melt adhesive permeates into the aperture of the base material cloth to obtain an insulating film, and then the insulating film and a conductor are rolled to obtain the bending-resistant flexible flat cable.
2. The method for manufacturing a flexible flat cable with bending resistance according to claim 1, wherein the thickness of the base cloth is 20-50 μm, the fiber diameter is 10-25 μm, the pore size of the base material is 0.2-2 μm, and the base cloth is polyester fiber plain cloth.
3. The method for preparing the bending-resistant flexible flat cable according to claim 1, wherein the coating method is performed in a doctor blade, curtain coating or casting mode.
4. The method for manufacturing a flexible flat cable with bending resistance according to claim 1, wherein the hot melt adhesive is thermally processed before coating, the thermal processing temperature is 150-300 ℃, and the hot melt adhesive is 500-5000cps at the thermal processing temperature.
5. The method for manufacturing a flexible flat cable with bending resistance according to claim 1, wherein the hot melt adhesive is at least one of ethylene-vinyl acetate copolymer, polypropylene, polyester, polyurethane, and polyamide; and/or
The depth of the hot melt adhesive penetrating into the pore diameter of the base fabric is 10-20 mu m.
6. The method for manufacturing a flexible flat cable with bending resistance according to claim 1, wherein the thickness of the outer adhesive layer of the base fabric is 50-100 μm, and the thickness of the conductor wire is 90-110 μm.
7. The method for manufacturing a flexible flat cable with bending resistance according to claim 1, wherein the rolling comprises pre-rolling and main rolling, wherein the temperature of the pre-rolling is 120-160 ℃, the temperature of the main rolling is 140-200 ℃, and the rolling pressure is 0.1-0.3MPa.
8. The method of manufacturing a flexible flat cable with bending resistance according to claim 1 wherein the base fabric is corona treated prior to the hot melt adhesive being applied to the base fabric.
9. A flexible flat cable resistant to bending, characterized in that it is manufactured by the manufacturing method according to any one of claims 1 to 9.
10. The repair method of the bending-resistant flexible flat cable according to claim 9, wherein the hot melt adhesive is dissolved in a solvent to prepare a hot melt adhesive solution with a viscosity of 50-500 cps, the hot melt adhesive solution is coated on the surface layer of the substrate in the degummed area, and then the substrate is placed in a vacuum environment to allow the hot melt adhesive to permeate into the degummed area and solidify.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410691155.8A CN118658674B (en) | 2024-05-30 | 2024-05-30 | Bending-resistant flexible flat cable, preparation method and repair method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410691155.8A CN118658674B (en) | 2024-05-30 | 2024-05-30 | Bending-resistant flexible flat cable, preparation method and repair method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN118658674A true CN118658674A (en) | 2024-09-17 |
| CN118658674B CN118658674B (en) | 2025-05-16 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5276759A (en) * | 1992-01-09 | 1994-01-04 | Raychem Corporation | Flat cable |
| JP2002367442A (en) * | 2001-06-04 | 2002-12-20 | Daikin Ind Ltd | Flat cable and manufacturing method thereof |
| US20040069525A1 (en) * | 2002-06-21 | 2004-04-15 | Carl Freudenberg Kg | Flexible flat cable |
| TW200410265A (en) * | 2002-12-02 | 2004-06-16 | Freudenberg Carl Kg | Three-dimensional moulded planar cable, method for production and use thereof |
| US20120282837A1 (en) * | 2011-05-03 | 2012-11-08 | Tesa Se | Adhesive tape for jacketing elongate material such as especially cable looms and jacketing method |
| CN105984156A (en) * | 2016-02-14 | 2016-10-05 | 芜湖金光汽车配件有限责任公司 | Repair method for defects of RTM product |
| CN112820479A (en) * | 2020-12-31 | 2021-05-18 | 广州敬信高聚物科技有限公司 | Method for repairing damaged insulating layer of power cable |
| CN117659886A (en) * | 2023-12-29 | 2024-03-08 | 广东莱尔新材料科技股份有限公司 | A hot-melt adhesive film for automotive FFC wire and its preparation method |
-
2024
- 2024-05-30 CN CN202410691155.8A patent/CN118658674B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5276759A (en) * | 1992-01-09 | 1994-01-04 | Raychem Corporation | Flat cable |
| JP2002367442A (en) * | 2001-06-04 | 2002-12-20 | Daikin Ind Ltd | Flat cable and manufacturing method thereof |
| US20040069525A1 (en) * | 2002-06-21 | 2004-04-15 | Carl Freudenberg Kg | Flexible flat cable |
| TW200410265A (en) * | 2002-12-02 | 2004-06-16 | Freudenberg Carl Kg | Three-dimensional moulded planar cable, method for production and use thereof |
| US20120282837A1 (en) * | 2011-05-03 | 2012-11-08 | Tesa Se | Adhesive tape for jacketing elongate material such as especially cable looms and jacketing method |
| CN105984156A (en) * | 2016-02-14 | 2016-10-05 | 芜湖金光汽车配件有限责任公司 | Repair method for defects of RTM product |
| CN112820479A (en) * | 2020-12-31 | 2021-05-18 | 广州敬信高聚物科技有限公司 | Method for repairing damaged insulating layer of power cable |
| CN117659886A (en) * | 2023-12-29 | 2024-03-08 | 广东莱尔新材料科技股份有限公司 | A hot-melt adhesive film for automotive FFC wire and its preparation method |
Non-Patent Citations (2)
| Title |
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| 张玉龙: "高技术复合材料制备手册", 31 May 2003, 国防工业出版社, pages: 87 - 90 * |
| 白刚等: "染整产品检验教程", 30 April 2021, 中国纺织出版社, pages: 175 - 176 * |
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| CN118658674B (en) | 2025-05-16 |
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