CN114938574A - Multi-stage hot-pressing roll-to-roll large-size FDC production process - Google Patents
Multi-stage hot-pressing roll-to-roll large-size FDC production process Download PDFInfo
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- CN114938574A CN114938574A CN202210620707.7A CN202210620707A CN114938574A CN 114938574 A CN114938574 A CN 114938574A CN 202210620707 A CN202210620707 A CN 202210620707A CN 114938574 A CN114938574 A CN 114938574A
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- 238000007731 hot pressing Methods 0.000 title claims abstract description 102
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011889 copper foil Substances 0.000 claims abstract description 27
- 238000007493 shaping process Methods 0.000 claims abstract description 27
- 239000000853 adhesive Substances 0.000 claims abstract description 24
- 230000001070 adhesive effect Effects 0.000 claims abstract description 24
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 21
- 238000005520 cutting process Methods 0.000 claims abstract description 18
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 230000005070 ripening Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 35
- 230000000694 effects Effects 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 2
- 238000003825 pressing Methods 0.000 description 14
- 238000010411 cooking Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0011—Working of insulating substrates or insulating layers
- H05K3/0014—Shaping of the substrate, e.g. by moulding
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/227—Drying of printed circuits
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Laminated Bodies (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention discloses a multi-stage hot-pressing roll-to-roll large-size FDC production process, which comprises the following steps of S1: providing a primary FDC in a roll shape, wherein the primary FDC comprises a first base film layer, a copper foil layer and a second base film layer which are sequentially bonded by using a thermosetting adhesive; s2: shaping and hot-pressing the primary FDC by a hot-pressing roller to obtain a secondary FDC; s3: forming and die cutting are carried out on the secondary FDC; s4: carrying out secondary shaping hot pressing on the formed and die-cut FDC through a plurality of groups of hot pressing rollers, and packaging into a package to obtain a three-level FDC; s5: curing and baking the third-stage FDC to obtain a finished large-size FDC; the multi-stage hot pressing is realized through the plurality of groups of hot pressing rollers, so that a good hot pressing fixing effect is achieved, a hot press is not required to be adopted for carrying out reciprocating hot pressing, the process procedure of reel-to-reel separation is realized, and bubbles in the primary FDC can be effectively eliminated.
Description
Technical Field
The invention belongs to the field of FDC production processes, and particularly relates to a multi-stage hot-pressing roll-to-roll large-size FDC production process.
Background
The Flexible Die-cutting Circuit board (FDC) is a Flexible Circuit which is made of polyimide or polyester film as a base material through a Die-cutting process and has high reliability and excellent performance, and the Flexible Circuit has the characteristics of free bending, folding and winding, free movement and stretching in a three-dimensional space, so that the integration of component assembly and wire connection is realized;
along with the development of the society, the demand on the FDC cargo volume is higher and higher, the traditional sheet production belongs to labor-intensive products, the time and labor requirements are higher, and the stability between the sizes cannot be guaranteed; the problems are solved to a certain extent by the roll-to-roll process, the required flexible material is subjected to FDC (fully drawn yarn) manufacturing in a roll-to-roll continuous mode, the production automation degree can be effectively improved, the labor cost is reduced, the production efficiency is improved, the influence on the size and the quality caused by human factors is further avoided, and the yield of finished products is improved.
When the large-size FDC is produced, a hot pressing process is arranged for ensuring that the FDC can reach enough pressing strength, specifically, a hot press is adopted for pressing operation, although the pressing strength required by the FDC is met, the procedure also causes the FDC to be separated from the roll-to-roll manufacturing process, and further a large amount of time and manpower resources are required to be prepared; therefore, a large-sized FDC production process is needed, in which the hot pressing process does not depart from the roll-to-roll process and the required pressing quality is achieved.
Disclosure of Invention
Aiming at the problem that the production is separated from the roll-to-roll process and the production rate is influenced in the hot pressing process in the FDC production in the prior art, the invention provides a production process for solving the problem.
In order to achieve the aim, the invention provides a multi-stage hot-pressing roll-to-roll large-size FDC production process, which comprises the following steps:
s1: providing a primary FDC in a roll shape, wherein the primary FDC comprises a first base film layer, a copper foil layer and a second base film layer which are sequentially bonded by using a thermosetting adhesive.
S2: shaping and hot-pressing the primary FDC by a hot-pressing roller to obtain a secondary FDC;
s3: forming and die cutting are carried out on the secondary FDC;
s4: carrying out secondary shaping hot pressing on the formed and die-cut FDC through a plurality of groups of hot pressing rollers, and packaging into a package to obtain a three-level FDC;
s5: and curing and baking the third-stage FDC to obtain the finished large-size FDC.
Wherein prior to S1, a primary FDC is prepared: firstly, die cutting is carried out on the first base film layer and the copper foil layer, thermosetting adhesive is laid on the first base film layer to adhere the copper foil, primary hot pressing is carried out by using a hot pressing roller, redundant copper foil tailings are removed, then a second base film layer is adhered by the thermosetting adhesive, and secondary hot pressing is carried out by using the hot pressing roller, so that primary FDC is obtained.
Wherein the temperature of the primary hot pressing is as follows: 145-155 ℃; the temperature of the secondary hot pressing is as follows: 125 ℃ and 135 ℃.
Wherein, in S2, the temperature of the shaping hot pressing is as follows: 125 ℃ and 135 ℃.
Wherein, in S4, the temperature of the secondary shaping hot pressing is as follows: 125 ℃ and 135 ℃.
Wherein, in S5, the three-stage FDC is cooked by an oven, and the cooking stage may be divided into a first cooking stage and a second cooking stage, the first cooking stage being: 65-75 ℃ for 3.5-4.5 h; the second curing stage is at 95-100 deg.c for 18-20 hr.
In S5, baking the tertiary FDC in an oven at the following temperature: 155-165 ℃, and the baking time is as follows: 1-2 h.
The first base film layer and the second base film layer are made of PI or PET.
The invention has the beneficial effects that: compared with the prior art, the multistage hot-pressing roll-to-roll large-size FDC production process provided by the invention comprises the following steps: s1: providing a primary FDC in a roll shape, wherein the primary FDC comprises a first base film layer, a copper foil layer and a second base film layer which are sequentially bonded by using a thermosetting adhesive; s2: shaping and hot-pressing the primary FDC by a hot-pressing roller pair to obtain secondary FDC; s3: forming and die cutting are carried out on the secondary FDC; s4: carrying out secondary shaping hot pressing on the formed and die-cut FDC through a plurality of groups of hot pressing rollers, and packaging into a package to obtain a three-level FDC; s5: curing and baking the three-stage FDC to obtain a finished large-size FDC; the obtained primary FDC is shaped and hot-pressed through a hot-pressing roller, so that the copper foil can be coated with thermosetting adhesive for fixing, and the copper foil cannot be displaced due to die cutting; carrying out the secondary hot pressing to the second grade FDC that the die-cut is good, further strengthening the solidification degree of thermosetting glue, also making the copper foil stereotype in FDC to obtain tertiary FDC, wind into the coiled material, can accomplish FDC's preparation through carrying out curing and toasting FDC, realize multistage hot pressing through multiunit hot pressing gyro wheel, make need not to adopt the hot press to carry out reciprocal hot pressing, realize not deviating from the processing procedure of book to the book.
Drawings
FIG. 1 is a diagram of the FDC production process of the present invention;
fig. 2 is a diagram of a conventional FDC production process.
Detailed Description
In order to more clearly describe the present invention, the present invention will be further described with reference to the accompanying drawings.
In the following description, details of the preferred examples are given to provide a more thorough understanding of the invention. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. It should be understood that the specific embodiments are illustrative of the invention and are not to be construed as limiting the invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
When the large-size FDC is produced, a hot pressing process is arranged for ensuring that the FDC can reach enough pressing strength, specifically, a hot press is adopted for pressing operation, although the pressing strength required by the FDC is met, the procedure also causes the FDC to be separated from the roll-to-roll process, and further a large amount of time and manpower resources are required to be allocated; therefore, a large-sized FDC production process is needed, in which the hot pressing process does not depart from the roll-to-roll process and the required pressing quality is achieved.
In order to solve the above technical problems, the present invention provides a multi-stage hot-pressing roll-to-roll large-size FDC production process, referring to fig. 1, including the following steps:
s1: providing a primary FDC in a roll shape, wherein the primary FDC comprises a first base film layer, a copper foil layer and a second base film layer which are sequentially bonded by using a thermosetting adhesive; s2: shaping and hot-pressing the primary FDC by a hot-pressing roller pair to obtain secondary FDC; s3: forming and die cutting are carried out on the secondary FDC; s4: carrying out secondary shaping hot pressing on the FDC subjected to forming and die cutting through a plurality of groups of hot pressing rollers, and packaging into a package to obtain a three-level FDC; s5: curing and baking the three-stage FDC to obtain a finished large-size FDC;
in the existing FDC production process, referring to fig. 2, a primary FDC is subjected to die cutting and then enters a curing stage, and after the curing stage is completed, pressing operation is performed through a hot press, so that it is not difficult to understand that the hot press has a hot press plate surface for flatly pressing two surfaces of the primary FDC, the cured primary FDC is pressed, and a pressing state is maintained for a period of time, so that the primary FDC reaches a proper pressing strength, cannot be easily peeled by external factors, and reaches an ideal pressing strength, but the process is separated from a roll-to-roll process, and the required time cost and the labor cost are more; in the invention, the cut primary FDC is shaped and hot-pressed by a hot-pressing roller, the temperature for shaping and hot-pressing is higher so as to solidify the thermosetting adhesive coated by the copper foil to obtain a secondary FDC, and the practice shows that in the step of shaping and hot-pressing, not only can a good hot-pressing fixing effect be achieved, but also bubbles in the primary FDC can be effectively eliminated, the bubbles are residual because the bubbles are not contacted with air in the process of preparing the primary FDC in a bonding process and can not be discharged in time, if the bubbles can not be further discharged, bad points can influence the performance of the copper foil, while in the traditional hot-pressing procedure, aiming at the phenomenon of the bubbles, the bubbles in the large-size FDC are further discharged by adopting a vacuum hot-pressing process, the area for one-time vacuum hot-pressing is higher, and the bubbles can not be effectively discharged because the preparation size is larger, and the inner side which is extruded, therefore, the phenomenon can be better avoided under the condition of needing matching a vacuum environment; the hot pressing roller adopted by the invention can achieve good defoaming effect due to the fact that the contact area between the heating roller and the primary FDC is small, and bubbles are effectively discharged from the primary FDC in a heating and rolling mode, so that the secondary FDC with good defoaming effect is obtained; after the second-stage FDC is subsequently die-cut, the FDC is hot-pressed by the hot-pressing rollers which are adopted again, after the circular knife is die-cut, the adhesive force at the position of a knife line is reduced, so that secondary shaping hot-pressing is carried out again through the hot-pressing rollers, but in the process of secondary shaping hot-pressing, the hot-pressing time of the second-stage FDC is not enough to reach the required pressing strength if one group of hot-pressing rollers is adopted for secondary shaping hot-pressing, so that in S4, two or more groups of hot-pressing rollers are adopted for secondary shaping hot-pressing to increase the reaction time of thermosetting adhesive, and the obtained third-stage FDC can be wound, so that the winding-to-winding process is not separated, the hot-pressing time of a traditional hot press is reduced, and the production capacity is further increased; and subsequently, curing and baking the obtained three-stage FDC to obtain the finished large-size FDC.
By making a statistical comparison of the above-described production process of the present invention with the existing FDC production process, the statistical comparison is shown in Table 1 below:
TABLE 1
| Treatment of | Adhesive force kg/10mm | 48 hours production quantity/pic |
| The production process of the invention | 1.0 | 4000 |
| The existing process | 1.0 | 2000 |
As can be seen from the chart 1, the FDC adhesive force obtained by the process of the present invention is equivalent to that of the existing thermal compression bonding process, and the present invention also achieves the index of the industrial standard of more than 0.7kg/10mm, so that, however, the number of the produced products is greatly increased within the same production time, and the advantages of the roll-to-roll process are reflected.
In this embodiment, prior to S1, the primary FDC is prepared: firstly, die cutting is carried out on a first base film layer and a copper foil layer, thermosetting adhesive is laid on the first base film layer to adhere a copper foil, primary hot pressing is carried out by using a hot pressing roller, redundant copper foil tailings are removed, then a second base film layer is adhered to the thermosetting adhesive, and secondary hot pressing is carried out by using the hot pressing roller to obtain primary FDC; firstly, carrying out die cutting on the first base film layer through a circular cutter to expose a pad hole in the FDC, then carrying out die cutting on the copper foil to realize the layout circuit of the circuit and obtain conduction, then laying thermosetting adhesive on the first base film layer to carry out primary hot pressing, removing waste materials of the copper foil after primary hot pressing is finished, then evenly laying thermosetting adhesive on the second base film layer after die cutting, and carrying out secondary hot pressing bonding on the first base film layer and the copper foil subjected to primary hot pressing and waste material removal to obtain primary FDC.
Further, the temperature of the primary hot pressing is as follows: 145-155 ℃; the temperature of the secondary hot pressing is as follows: 125 ℃ and 135 ℃; the higher temperature that passes through earlier makes copper foil and first base film layer carry out effectual bonding fixed for the copper foil can not take place to shift when carrying out the rejection with second base film layer bonding and copper foil waste material of being taboo of fususy.
In this embodiment, in S2, the temperature of the shaping hot pressing is: 125 ℃ and 135 ℃; preferably 130 c, which rapidly sets the primary FDC for the subsequent die cutting stage.
In this embodiment, in S4, the temperature of the secondary shaping hot pressing is: 125-135 ℃; preferably 130 c, through which the die-cut secondary FDC is re-shaped.
In this embodiment, the three-stage FDC is matured by the oven in S5, and the maturing stage may be divided into a first maturing stage and a second maturing stage, and the first maturing stage is: 65-75 deg.C, preferably 70 deg.C, for 3.5-4.5h, preferably 4 h; the second ripening stage is 95-105 deg.C, preferably 100 deg.C, for 18-20h, preferably 20 h; selecting epoxy thermosetting adhesive as adhesive, and curing in the environment; compared with the existing hot pressing process, the process has the advantages that the process is carried out by firstly curing and then carrying out vacuum hot pressing, the curing process stage is carried out, the curing temperature is 50 ℃, the curing time is 30 hours, the process parameters are relatively fixed, the required time is long, excessive reaction is easy to occur when the temperature is higher than 50 ℃, the fluidity of thermosetting adhesive is reduced, the separation phenomenon of a copper foil layer is easy to occur when the vacuum hot pressing is carried out again, and the required time for curing is prolonged if the temperature is lower than 50 ℃; in the multistage hot pressing process, the first curing stage and the second curing stage are carried out on the three-stage FDC obtained after the secondary shaping and hot pressing, the temperature is 70 ℃, the heat preservation time is 4 hours, the temperature is increased to 100 ℃, the heat preservation time is 20 hours, the understanding is easy, the upper limit of the curing temperature is improved by the three-stage FDC after the secondary shaping and hot pressing, the time required by curing is further shortened, further, the curing is specifically divided into two stages, when the reaction degree of thermosetting adhesive is improved, the temperature is further increased for curing, and the curing time is further shortened.
In this embodiment, in S5, the three-stage FDC is baked by the oven at the baking temperature: 155-165 ℃, and the baking time is as follows: 1-2 h; the preferred temperatures are: the heat preservation time is as follows at 160℃: 1 h; and (4) putting the cured three-stage FDC into an oven for high-temperature baking to be completely cured to obtain a finished product.
In this embodiment, the first base film layer and the second base film layer are made of PI or PET; in this embodiment, the first base film layer and the second base film layer are preferably made of PI, and PI has good high temperature resistance and can meet the temperature requirements in each stage.
The invention has the advantages that:
1) the hot-pressing roller is adopted to carry out shaping hot pressing on the cut primary FDC, the temperature adopted by the shaping hot pressing is higher, so that the thermosetting adhesive coated by the copper foil is cured to obtain the secondary FDC, the good hot-pressing fixing effect is achieved, and the bubbles in the primary FDC can be effectively eliminated;
2) the multi-stage hot pressing is realized through the plurality of groups of hot pressing rollers, so that the hot pressing machine is not required to be adopted for carrying out reciprocating hot pressing, and the process procedure of roll-to-roll is not separated.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be considered by those skilled in the art are intended to fall within the scope of the present invention.
Claims (8)
1. A multi-stage hot-pressing roll-to-roll large-size FDC production process is characterized by comprising the following steps:
s1: providing a primary FDC in a roll shape, wherein the primary FDC comprises a first base film layer, a copper foil layer and a second base film layer which are sequentially bonded by using a thermosetting adhesive;
s2: shaping and hot-pressing the primary FDC by a hot-pressing roller to obtain a secondary FDC;
s3: forming and die cutting are carried out on the secondary FDC;
s4: carrying out secondary shaping hot pressing on the FDC subjected to the shaping and die cutting through a plurality of groups of hot pressing rollers, and packaging into a package to obtain a three-level FDC;
s5: and curing and baking the third-stage FDC to obtain the finished large-size FDC.
2. The multi-stage hot-pressed roll-to-roll large-size FDC production process according to claim 1, wherein prior to S1, a primary FDC is prepared: firstly, die cutting is carried out on the first base film layer and the copper foil layer, thermosetting adhesive is laid on the first base film layer to adhere the copper foil, primary hot pressing is carried out by using a hot pressing roller, redundant copper foil tailings are removed, then a second base film layer is adhered by the thermosetting adhesive, and secondary hot pressing is carried out by using the hot pressing roller, so that primary FDC is obtained.
3. The multi-stage hot-pressing roll-to-roll large-size FDC production process according to claim 1, wherein the temperature of the primary hot pressing is: 145-155 ℃; the temperature of the secondary hot pressing is as follows: 125 ℃ and 135 ℃.
4. The multi-stage hot-press roll-to-roll large-size FDC production process of claim 1, wherein the temperature of the shaping hot-press in S2 is: 125-135 ℃.
5. The multi-stage hot-press roll-to-roll large-size FDC production process of claim 1, wherein the temperature of the secondary shaping hot-press in S4 is: 125 ℃ and 135 ℃.
6. The multi-stage hot-pressed roll-to-roll large-sized FDC manufacturing process of claim 1, wherein the three-stage FDC is ripened by the oven at S5, the ripened stage is divided into a first ripened stage and a second ripened stage, the first ripened stage is: 65-75 ℃ for 3.5-4.5 h; the second ripening stage is 95-105 deg.C for 18-20 hr.
7. The multi-stage hot-pressed roll-to-roll large-sized FDC production process of claim 1, wherein the three-stage FDC is baked through an oven at a temperature of: 155-165 ℃, and the baking time is as follows: 1-2 h.
8. The multi-stage hot-pressing roll-to-roll production process for large-size FDC, according to claim 1, wherein the first and second base film layers are PI or PET.
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| CN202210620707.7A CN114938574B (en) | 2022-06-02 | 2022-06-02 | Multistage hot-pressing roll-to-roll large-size FDC production process |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103538341A (en) * | 2012-07-17 | 2014-01-29 | 昆山雅森电子材料科技有限公司 | Hot rolling lamination equipment |
| CN212211562U (en) * | 2020-04-15 | 2020-12-22 | 深圳市信维通信股份有限公司 | Automatic laminating mechanism of multilayer circuit board |
| CN114340156A (en) * | 2021-11-04 | 2022-04-12 | 新余市木林森线路板有限公司 | Manufacturing method of PET material die cutting process flexible single panel |
| CN216335764U (en) * | 2021-08-23 | 2022-04-19 | 大富科技(安徽)股份有限公司 | Antenna and antenna processing device |
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2022
- 2022-06-02 CN CN202210620707.7A patent/CN114938574B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103538341A (en) * | 2012-07-17 | 2014-01-29 | 昆山雅森电子材料科技有限公司 | Hot rolling lamination equipment |
| CN212211562U (en) * | 2020-04-15 | 2020-12-22 | 深圳市信维通信股份有限公司 | Automatic laminating mechanism of multilayer circuit board |
| CN216335764U (en) * | 2021-08-23 | 2022-04-19 | 大富科技(安徽)股份有限公司 | Antenna and antenna processing device |
| CN114340156A (en) * | 2021-11-04 | 2022-04-12 | 新余市木林森线路板有限公司 | Manufacturing method of PET material die cutting process flexible single panel |
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