CN113747652A

CN113747652A - Roll-shaped laminated structure and preparation method thereof

Info

Publication number: CN113747652A
Application number: CN202010463313.6A
Authority: CN
Inventors: 黄炜新; 苏赐祥; 向首睿; 李冠纬; 吴佩蓉
Original assignee: Zhen Ding Technology Co Ltd
Current assignee: Zhen Ding Technology Co Ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-12-03
Anticipated expiration: 2040-05-27
Also published as: CN113747652B

Abstract

The invention provides a preparation method of a roll-shaped laminated structure, which comprises the following steps: providing a composite layer structure, wherein the composite layer structure comprises a metal layer and a precursor coated on the metal layer; providing a magnetic part, wherein the magnetic part is provided with an air escape groove; rewinding the magnetic member facing the precursor and the composite layer structure to obtain a roll-shaped laminated structure intermediate, wherein the magnetic members of adjacent layers are adsorbed to support the composite layer structure; and baking the roll laminated structure intermediate to enable the precursor to be cyclized to form a flexible film layer, so that the roll laminated structure is obtained. The invention also provides a rolled laminated structure prepared by the method.

Description

Roll-shaped laminated structure and preparation method thereof

Technical Field

The invention relates to the field of flexible printed circuit boards, in particular to a rolled laminated structure and a preparation method thereof.

Background

The flexible copper clad laminate is a basic material for producing flexible printed circuits. The flexible copper clad laminate comprises an insulating resin layer and a copper foil which is stacked on the surface of the insulating resin layer, can be subjected to micro-loop processing, and can be bent in a narrow space. The insulating resin layer is typically a polyimide film. In the prior art, the flexible copper clad laminate is generally prepared by a method that a polyimide film is formed on a copper foil in a mode of whole roll loosening and high-temperature cyclization after a polyamic acid solution is coated on the copper foil. The whole roll is relaxed and cyclized at high temperature in a standing mode.

In order to meet the requirement of high frequency of electronic products, a flexible copper clad laminate with a thicker polyimide film and a thinner copper foil is needed. When the stand-type baking method is adopted for baking, due to the fact that the supporting performance of the copper foil coated with the polyamic acid solution is insufficient, and blowing of air flow is added, the copper foil coated with the polyamic acid solution and rolled into a cylindrical shape is prone to collapse to become a non-perfect circle, and appearance defects are caused. In addition, the collapse parts are tightly attached together, which can prevent solvent from volatilizing to cause sticking. Therefore, roll-to-roll (roll) high-temperature cyclization is used in the industry to replace standing high-temperature cyclization, but roll-to-roll high-temperature cyclization only can realize high-temperature cyclization of one roll at a time, thereby reducing the productivity.

Disclosure of Invention

Accordingly, there is a need for a roll-type laminated structure with excellent appearance, non-sticking property and high productivity and a method for manufacturing the same.

The invention provides a preparation method of a roll-shaped laminated structure, which comprises the following steps: providing a composite layer structure, wherein the composite layer structure comprises a metal layer and a precursor coated on the metal layer; providing a magnetic part, wherein the magnetic part is provided with an air escape groove; rewinding the magnetic member facing the precursor and the composite layer structure to obtain a roll-shaped laminated structure intermediate, wherein the magnetic members of adjacent layers are adsorbed to support the composite layer structure; and baking the roll laminated structure intermediate to enable the precursor to be cyclized to form a flexible film layer, so that the roll laminated structure is obtained.

The present invention also provides a rolled laminated structure comprising: the composite layer structure comprises a metal layer and a flexible film layer coated on the metal layer; the magnetic part is arranged on the composite layer structure facing the flexible film layer, and is provided with an air escape groove; wherein the magnetic members of adjacent layers are attracted together to support the composite layer structure.

According to the invention, the roll-shaped laminated structure is prepared by rewinding and baking the magnetic member facing to the precursor and the composite layer structure of the composite layer structure at high temperature, and the magnetic members of adjacent layers are adsorbed, so that the roll-shaped laminated structure has the following advantages: firstly, the adsorbed magnetic part can support the composite layer structure to complete batch baking in a standing mode, and the composite layer structure can be prevented from collapsing into a non-perfect circle due to blowing of air flow, so that the capacity is improved, and a flexible film layer with excellent appearance can be obtained; secondly, the air escape groove on the magnetic part is beneficial to discharging the solvent, so that the material can be prevented from being adhered; third, after baking, the magnetic member can be separated from the composite layered structure, and thus, the magnetic member can be recycled.

Drawings

Fig. 1 is a schematic diagram of a composite layer structure according to an embodiment of the present invention.

Fig. 2 is a partial cross-sectional view of the composite layer structure shown in fig. 1.

Fig. 3 is a schematic structural diagram of a magnetic member according to an embodiment of the present invention.

Figure 4 is a schematic representation of the composite layered structure of figure 1 and the magnetic member of figure 3 rewound together to provide a roll-like layered structure intermediate.

Fig. 5 is a plan view of the roll laminated structure intermediate shown in fig. 4.

Fig. 6 is a schematic view of a roll stack structure according to an embodiment of the present invention.

Fig. 7 is a partial cross-sectional view of the rolled laminate structure shown in fig. 6.

Description of the main elements

Composite layer structure 10

Metal layer 11

Precursor 13

Coating zone 111

Non-coating region 113

Magnetic member 20

Air escape groove 21

First surface 22

Second surface 23

Side 24

Roll laminated structure intermediate 30

First reel 41

Second reel 42

Third reel 43

Flexible film layer 50

Rolled laminated structure 100

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

An embodiment of the present invention provides a method for preparing a rolled laminated structure, including the steps of:

s1, providing a composite layer structure, wherein the composite layer structure comprises a metal layer and a precursor coated on the metal layer;

s2, providing a magnetic piece, wherein the magnetic piece is provided with an air escape groove;

s3, rewinding the magnetic member facing the precursor and the composite layer structure to obtain a roll-shaped laminated structure intermediate;

s4, baking the roll-shaped laminated structure intermediate to enable the precursor to be cyclized to form a flexible film layer, and therefore the roll-shaped laminated structure is obtained.

Referring to fig. 1 and fig. 2, in step S1, a composite layer structure 10 is provided, in which the composite layer structure 10 includes a metal layer 11 and a precursor 13 coated on the metal layer 11.

Specifically, the metal layer 11 includes a coating region 111 and non-coating regions 113 located at two sides of the coating region 111, and the precursor 13 covers the coating region 111. In an alternative embodiment, the precursor 13 may completely cover the coating region 111 and the non-coating region 113.

The precursor 13 forms a flexible film layer 50 (see fig. 6) after curing. The precursor 13 may be a polyamic acid solution, a liquid crystal polymer solution, or the like.

The metal layer 11 may be a copper foil, a silver foil, a gold foil, or the like.

Referring to fig. 3, in step S2, a magnetic member 20 is provided, and the magnetic member 20 is provided with an air escape slot 21.

The magnetic member 20 has two opposite magnetic poles, e.g., an S pole and an N pole. Specifically, the magnetic member 20 includes a first surface 22 and a second surface 23 disposed opposite to each other, and a plurality of side surfaces 24 connecting the first surface 22 and the second surface 23. Wherein the first surface 22 is an S pole and the second surface 23 is an N pole.

In the present embodiment, the first surface 22 and the second surface 23 are both provided with the air escape groove 21. In alternative embodiments, the air escape groove 21 may be provided only on the first surface 22 or the second surface 23. Two ends of the gas escape groove 21 penetrate through the two opposite side surfaces 24, and are used for discharging the solvent in the precursor 13 during curing.

In the present embodiment, in the longitudinal direction of the magnetic member 20, the projection of the air escape groove 21 provided on the first surface 22 in the thickness direction of the magnetic member 20 and the projection of the air escape groove 21 provided on the second surface 23 in the thickness direction of the magnetic member 20 are alternately provided at intervals. In an alternative embodiment, a projection of the air escape groove 21 provided on the first surface 22 in the thickness direction of the magnetic member 20 and a projection of the air escape groove 21 provided on the second surface 23 in the thickness direction of the magnetic member 20 may overlap. The cross section of the air escape groove 21 in the thickness direction of the magnetic member 20 may be square, semicircular, triangular, or the like.

Referring to fig. 4, in step S3, the magnetic member 20 is rewound to form a roll-shaped intermediate laminate structure 30 facing the precursor 13 and the composite layer structure 10.

In this embodiment, two magnetic members 20 are rewound to both sides of the composite layered structure 10 facing the precursor 13, to obtain the intermediate body 30 of the roll-shaped stacked structure. Specifically, two magnetic members 20 are wound on a first reel 41, the composite layer structure 10 is wound on a second reel 42, and the two magnetic members 20 are rewound to the two non-coating regions 113 of the metal layer 11 facing the precursor 13 by a rewinding process, so as to obtain the intermediate body 30 of the rolled laminated structure. The roll-shaped laminated structure intermediate 30 is wound on a third reel 43. Preferably, the magnetic member 20 and the precursor 13 rewound onto the non-coating region 113 of the metal layer 11 are spaced apart. Optionally, the magnetic member 20 may also be disposed on a side of the precursor 13 facing away from the metal layer 11. The thickness of the magnetic member 20 is slightly larger than that of the precursor 13. In this embodiment, the thickness of the magnetic member 20 is 3 to 8mm, the width of the magnetic member 20 is 5 to 10mm, the width of the precursor 13 is 255 to 505mm, and the width of the metal layer 11 is 270 to 540 mm.

Referring to fig. 5, in the roll-shaped laminated structure intermediate 30, the magnetic members 20 of adjacent layers are attracted together by the different magnetic poles to support the laminated structures 10, so that the laminated structures are stiff and do not collapse when baked in a standing manner.

Referring to fig. 4 to 7, in step S4, the roll-shaped laminated structure intermediate 30 is placed in an oven to be baked, so that the precursor 13 is cyclized at a high temperature to form the flexible film layer 50, thereby obtaining the roll-shaped laminated structure 100.

Wherein the baking is finished in nitrogen, and the baking temperature is 200-380 ℃. When baking, the roll-shaped laminated structure intermediate 30 is vertically placed in the oven in a whole roll, and is baked in a standing manner. During baking, the solvent in the precursor 13 can be discharged from the gas escape slot 21, so that the adhesion of the material can be avoided.

After baking, the magnetic member 20 in the roll laminated structure 100 can be separated from the composite layer structure 10, and thus the magnetic member 20 can be recycled.

Referring to fig. 6 and 7, a roll-type laminated structure 100 according to an embodiment of the present invention includes a composite layer structure 10 and magnetic members 20 disposed on the composite layer structure 10, wherein the magnetic members 20 of adjacent layers are adsorbed together to support the composite layer structure 10.

The composite layer structure 10 includes a metal layer 11 and a flexible film layer 50 coated on the metal layer 11. The metal layer 11 includes a coating region 111 and non-coating regions 113 disposed on two sides of the coating region 111, and the flexible film layer 50 covers the coating region 111. In an alternative embodiment, the flexible film layer 50 may completely cover the coated region 111 and the non-coated region 113.

The flexible film layer 50 may be a polyimide film, a liquid crystal polymer film, or the like, which may be formed by high temperature curing of a corresponding precursor, such as a polyamic acid solution, a liquid crystal polymer solution.

The magnetic member 20 is disposed on the composite layer structure 10 facing the flexible film layer 50.

In this embodiment, two magnetic members 20 are disposed on two non-coating regions 113 of the metal layer 11 facing the flexible film layer 50. Preferably, the magnetic member 20 and the flexible film layer 50 disposed on the non-coating region 113 of the metal layer 11 are disposed at a distance. Optionally, the magnetic element 20 may also be disposed on a side of the flexible film layer 50 facing away from the metal layer 11. The thickness of the magnetic member 20 is slightly larger than that of the flexible film layer 50. In this embodiment, the thickness of the magnetic member 20 is 3-8 mm, the width of the magnetic member 20 is 5-10 mm, the width of the flexible film layer 50 is 255-505 mm, and the width of the metal layer 11 is 270-540 mm.

Referring to fig. 3, the magnetic member 20 has two opposite magnetic poles, such as an S pole and an N pole. Specifically, the magnetic member 20 includes a first surface 22 and a second surface 23 disposed opposite to each other, and a plurality of side surfaces 24 connecting the first surface 22 and the second surface 23. Wherein the first surface 22 is an S pole and the second surface 23 is an N pole.

The magnetic member 20 is provided with an air escape groove 21 for discharging the solvent in the precursor of the flexible film layer 50 during curing, so as to prevent the material from being adhered. In the present embodiment, the first surface 22 and the second surface 23 are both provided with the air escape groove 21. In alternative embodiments, the air escape groove 21 may be provided only on the first surface 22 or the second surface 23. The two ends of the air escape groove 21 penetrate the two opposite side surfaces 24.

According to the invention, the roll-shaped laminated structure 100 is prepared in a manner that the magnetic members 20 face the precursor 13 of the composite layer structure 10 and the composite layer structure 10 to be rewound and baked at high temperature, and the magnetic members 20 of adjacent layers are adsorbed, so that the roll-shaped laminated structure has the following advantages: firstly, the magnetic member 20 can support the composite layer structure 10 to complete batch baking in a standing manner, and can prevent the composite layer structure 10 from collapsing into a non-perfect circle due to blowing of air flow, so that the productivity is improved and the flexible film 50 with excellent appearance can be obtained; secondly, the air escape groove 21 on the magnetic member 20 is beneficial to discharging the solvent, so that the material can be prevented from being adhered; third, after baking, the magnetic member 20 may be separated from the composite layer structure 10, and thus, the magnetic member 20 may be recycled.

While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A method of making a rolled laminate structure comprising the steps of:

providing a composite layer structure, wherein the composite layer structure comprises a metal layer and a precursor coated on the metal layer;

providing a magnetic part, wherein the magnetic part is provided with an air escape groove;

rewinding the magnetic member facing the precursor and the composite layer structure to obtain a roll-shaped laminated structure intermediate, wherein the magnetic members of adjacent layers are adsorbed to support the composite layer structure;

and baking the roll laminated structure intermediate to enable the precursor to be cyclized to form a flexible film layer, so that the roll laminated structure is obtained.

2. A method of making a rolled laminate structure as claimed in claim 1, wherein said metal layer comprises a coated region and non-coated regions on either side of said coated region, said precursor covering said coated region, said magnetic members being rewound onto said non-coated regions.

3. The method of manufacturing a roll-like laminated structure according to claim 1, wherein the magnetic member includes a first surface and a second surface which are oppositely disposed and a plurality of side surfaces which connect the first surface and the second surface, and the air escape groove is provided on at least one of the first surface and the second surface and penetrates both of the opposite side surfaces.

4. The method of producing a rolled laminated structure according to claim 3, wherein in a longitudinal direction of the magnetic member, projections of the air escape grooves provided on the first surface in a thickness direction of the magnetic member and projections of the air escape grooves provided on the second surface in the thickness direction of the magnetic member are alternately provided at intervals.

5. The method of producing a rolled laminated structure according to claim 1, wherein the precursor is a polyamic acid solution or a liquid crystal polymer solution.

6. The method of making a roll good laminate of claim 1, wherein during baking, the roll good laminate intermediate is baked in the oven vertically in its entirety.

7. A rolled laminate structure, comprising:

the composite layer structure comprises a metal layer and a flexible film layer coated on the metal layer; and

the magnetic part faces the flexible film layer and is arranged on the composite layer structure, and an air escape groove is formed in the magnetic part;

wherein the magnetic members of adjacent layers are attracted together to support the composite layer structure.

8. The roll stack structure according to claim 7, wherein the metal layer includes a coated region and non-coated regions on both sides of the coated region, the flexible film layer covers the coated region, and the magnetic member is disposed on the non-coated region.

9. The roll stack structure of claim 7, wherein the magnetic member comprises a first surface and a second surface disposed opposite to each other and a plurality of side surfaces connecting the first surface and the second surface, and the air escape groove is disposed on at least one of the first surface and the second surface and penetrates through both of the opposite side surfaces.

10. The roll stack structure according to claim 9, wherein projections of the air escape grooves provided on the first surface in a thickness direction of the magnetic member and projections of the air escape grooves provided on the second surface in the thickness direction of the magnetic member are alternately arranged at intervals in a length direction of the magnetic member.