Fluorine resin sheet coating device

Abstract

The present invention provides a fluororesin sheet coating device, which is used to automatically coat the fluororesin sheet with a liquid to produce chemical etching to modify its surface, and includes a conveying wheel that carries the fluororesin sheet in a rotating manner, and a coating machine arranged below the conveying wheel, the coating machine has a platform corresponding to the conveying wheel, and at least one slit channel that runs through the coating machine, wherein a micro gap is maintained between the platform and the corresponding conveying wheel to provide the liquid to flow in from the outlet of the slit channel to fill it; thereby, the fluororesin sheet is driven by the rotation of the conveying wheel to pass through and contact the liquid to produce capillary action and be attached. The present invention is simple and easy to implement, and can be fully introduced into automated production operations to improve economic efficiency.

Description

Technical Field

[0001] The present invention relates to a coating device, in particular to an automatic processing device for applying liquid coating to a fluororesin sheet to produce chemical etching to modify its surface. Background Art

[0002] The fluororesin sheet involved in the present invention refers to ETFE (ethylene-tetrafluoroethylene copolymer), PTFE (polytetrafluoroethylene), or any other fluororesin-related polymer resin synthesized through chemical processes. Since the fluororesin itself has good chemical stability, electrical insulation, excellent heat resistance, corrosion resistance and high purity, it is very suitable for use in manufacturing processes such as semiconductor equipment, high-purity chemicals, petrochemicals, or chemical industries; however, due to its regular structure, poor wettability, and difficulty in being infiltrated by adhesives, its application range is limited to some extent.

[0003] If a special treatment is performed on the surface of a fluororesin sheet, a satisfactory wetting effect can be obtained. For example, Chinese patent No. CN102432901A discloses chemical etching of the surface with a "sodium naphthalene solution" for modification; that is, by transferring the electrons of the outer layer of sodium (Na) to the empty orbit of naphthalene to form a cation free radical, the cation free radical then forms an ion pair with the sodium ion (the process must be continuously stirred), during which a large amount of resonance energy is released to produce a dark green metal mixed solution. This solution is highly reactive. When it comes into contact with a fluororesin sheet such as PTFE (polytetrafluoroethylene), the ion pair can destroy the CF bond, that is, tear off the fluorine atoms on the surface of the PTFE (polytetrafluoroethylene), defluorinate the surface to form a dark brown carbonized layer, and increase the critical surface tension of the PTFE to be sufficient to combine with the adhesive. However, it should be noted that if the surface of the PTFE is excessively corroded, the negative effects such as reducing the cohesive strength of the surface layer and increasing the contact angle may be caused by the corroded carbonized layer being too thick (more than 1um).

[0004] At present, the etching process of the fluororesin sheet surface with the sodium naphthalene solution still relies on manual immersion. Obviously, it is not only very inefficient, but also the immersion sodium naphthalene solution easily flows to the non-processed surface of the fluororesin sheet to cause pollution, affecting the pure quality of the fluororesin sheet.

[0005] In order to introduce automated processing operations, the applicant has learned from known public documents, including coating technologies disclosed in patents such as US4,480,583 and US5,318,804, such as Figure 1 , referring to a method in which a roller 10 is used to drive a material to be processed 11 to be transported to a processing area, a coating machine 12 is arranged in the processing area, one end of the coating machine 12 is connected to an external pipeline to supply processing fluid, and a head 13 at the opposite end corresponds to the material to be processed 11 to automatically apply the processing fluid to the surface of the material to be processed.

[0006] These prior art designs are mainly used for thick coating solutions, and the flow rate and output pressure of the solutions are difficult to control and cannot be "uniformly" coated on the processed materials, and may even easily overflow to the outside, resulting in waste and pollution. Figure 2 As shown, a scraper-like mechanism 14 is designed at the end of the head 13 of the coating machine 12 to achieve the effect of uniform solution flow, but it also makes the design of the coating device complicated and difficult to implement, and also increases the manufacturing cost. Summary of the invention

[0007] The main purpose of the present invention is to provide a fluororesin sheet coating device, which is simple and easy to implement and can fully introduce automated production operations to improve economic efficiency.

[0008] The present invention discloses a fluororesin sheet coating device, which is used for automatically coating a liquid medicine on a fluororesin sheet to produce chemical etching, so as to modify the surface of the fluororesin sheet. The device comprises: a conveying wheel, which carries the fluororesin sheet in a rotating manner; a coating machine arranged below the conveying wheel, the coating machine having a platform corresponding to the conveying wheel, and at least one slit channel penetrating the coating machine, wherein a micro gap is maintained between the platform and the corresponding conveying wheel; and a flow controller, which is connected to the coating machine to supply liquid medicine; thereby, the liquid medicine is injected into the coating machine by the flow controller, flows along the slit channel and is maintained on the surface of the platform so that the liquid medicine fills the micro gap to form a closed space that contacts the fluororesin sheet to produce capillary action, and the liquid medicine is replenished by the flow controller in a timely manner so that the closed space continues to exist.

[0009] Optionally, the medicinal liquid is a sodium naphthalene solution.

[0010] Optionally, the height of the micro gap is 1 to 5 mm.

[0011] Optionally, the slit channel has two ports, which are respectively an outlet connected to the platform and an inlet connected to the flow controller.

[0012] Thus, a micro-gap is maintained between the platform of the present invention and the corresponding conveying wheel to provide the liquid medicine to flow in from the outlet of the slit channel to fill and close it, and the conveying wheel rotates to drive the fluororesin sheet to pass through and contact the liquid medicine to produce capillary action and attach it. The closed space filled with the liquid medicine in the micro-gap is the best reaction area in the coating process, which can reduce the chance of liquid medicine oxidation, and even if it is produced at an oxygen content of about 2%, it will lose its activity immediately. At the same time, the amount of liquid medicine used in the coating process of the present invention can be greatly reduced, and only a small amount of liquid medicine attached to the fluororesin sheet is reduced by being taken away as the conveying wheel moves forward, and then the liquid medicine is replenished in time through a flow controller to maintain the existence of the closed capillary action space, so as to achieve the automated production conditions of balanced supply and demand of liquid medicine; more importantly, the present invention is simpler and easier to implement than the previous technology in terms of design and equipment configuration, and can be fully introduced into automated production operations to improve economic efficiency, which is the main purpose of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a configuration diagram of a coating device in the prior art.

[0014] Figure 2 So Figure 1 A diagram showing the implementation status of a coating machine coating a solution on a processed material.

[0015] Figure 3 It is a configuration diagram of the coating device of the present invention.

[0016] Figure 4 This is a diagram showing the implementation of the coating device of the present invention coating the surface of a fluororesin sheet with a chemical solution.

[0017] In the figure:

[0018] 2 conveying wheel; 3 coating machine; 30 platform; 31 slit channel; 310 outlet; 311 inlet; 4 fluororesin sheet; 5 liquid medicine; 6 outer tube; 7 flow controller; H micro gap. DETAILED DESCRIPTION

[0019] The present invention is a coating device, in particular, an automated processing device for applying a liquid coating to a fluororesin sheet to produce chemical etching to modify its surface. The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0020] Please refer to Figure 3As shown, the coating device of the present invention mainly includes a conveying wheel 2 and a coating machine 3 arranged "below" the conveying wheel 2, wherein the conveying wheel 2 carries the coated material in a rotating manner. In this embodiment, the "coated material" is a fluororesin sheet 4, and the fluororesin sheet 4 has two opposite plate surfaces, one is a bearing surface 40 linked to the conveying wheel 2, and the other is a coating surface 41.

[0021] The coater 3 has a platform 30 corresponding to the conveying wheel 2, and at least one slit channel 31 running through the coater 3. The slit channel 31 has two ports, including an outlet 310 connected to the platform 30 and an inlet 311 connected to the outside of the coater 3. In addition, a micro gap H is maintained between the platform 30 of the coater 3 and the corresponding conveying wheel 2. Preferably, the height of the micro gap H is approximately 1 to 5 mm.

[0022] Please also refer to Figure 4 When the coating process is implemented in the present invention, an outer tube 6 for conveying liquid medicine 5 is connected to the inlet 311 of the slit channel 31, so that the liquid medicine 5 enters the slit channel 31 from the inlet 311. Preferably, the liquid medicine 5 coated in this embodiment is a "sodium naphthalene solution", but not limited to this; wherein a flow controller 7 is arranged on the outer tube 6 to control the flow rate of the liquid medicine supply.

[0023] When the liquid medicine 5 is injected into the coating machine 3 from the inlet 311, it rises along the slit channel 31 to the outlet 310 and flows to the surface of the platform 30 to fill the micro gap H (the optimal height is 1-5 mm) between the platform 30 and the conveying wheel 2. The liquid medicine 5 contacts the coating surface 41 of the corresponding fluororesin sheet 4 above to generate capillary action and is absorbed. The closed space formed by the capillary action after the liquid medicine 5 is injected into the micro gap H is the best reaction area in the coating process, which can reduce the chance of oxidation of the liquid medicine, and even at an oxygen content of about 2%, it loses its activity immediately; at the same time, in the coating process of the present invention, the amount of liquid medicine 5 used can be greatly reduced, and only a small amount of liquid medicine 5 attached to the fluororesin sheet 4 is taken away when the conveying wheel 2 moves forward, and the liquid medicine 5 can be replenished in time through the flow controller 7 so that the closed space where the capillary action is generated continues to exist, achieving the ideal processing condition of balanced supply and demand of the liquid medicine 5.

[0024] The fluororesin sheet 4 attached with the liquid medicine 5 can break the CF bond and tear off the fluorine atoms, so that the coated surface 41 thereof is defluorinated to form a dark brown carbonized layer, resulting in an increase in the critical surface tension suitable for bonding with the adhesive; moreover, through the processing device provided by the present invention, the rotation speed of the conveying wheel 2 is controlled so that the coated surface 41 of the fluororesin sheet 4 will not be excessively corroded and can be automated. In particular, the design and configuration of this coating device are simpler and easier to implement than the previous technology provided by the inventor. During the process, the non-processing (coating) surface of the fluororesin sheet 4 will not be contaminated by the liquid medicine 5, and the overflow loss of the liquid medicine 5 can also be reduced.

[0025] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A fluororesin sheet coating device, used for automatically coating a chemical solution on a fluororesin sheet to produce chemical etching, so as to modify the surface of the fluororesin sheet, characterized in that: include: a conveying wheel for carrying the fluororesin sheet in a rotating manner; a coating machine disposed below the conveying wheel, the coating machine having a platform corresponding to the conveying wheel and at least one slit channel running through the coating machine, wherein a micro gap is maintained between the platform and the corresponding conveying wheel; and, a flow controller connected to the coating machine to supply the liquid medicine; In this way, the flow controller is used to inject the liquid medicine into the coating machine, and the liquid medicine flows along the slit channel and is maintained on the surface of the platform so that the liquid medicine fills the micro-gap to form a closed space that contacts the fluororesin sheet to produce capillary action, and the liquid medicine is replenished by the flow controller in a timely manner to ensure that the closed space continues to exist.

2. The fluororesin sheet coating device according to claim 1, characterized in that: The medicinal liquid is a sodium naphthalene solution.

3. The fluororesin sheet coating device according to claim 1 or 2, characterized in that: The height of the micro gap is 1 to 5 mm.

4. The fluororesin sheet coating device according to claim 1 or 2, characterized in that: The slit channel has two ports, which are respectively an outlet connected to the platform and an inlet connected to the flow controller.

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