JP4299051B2 - Method for forming ultra-thin film on card or card material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of spraying an antistatic agent on the surface of a card or card material made of plastic, paper, metal or the like to form an ultrathin film of the antistatic agent.
[0002]
[Prior art]
Conventionally, a solution of a surface modifying agent such as an antistatic agent is made into a mist composed of a large number of fine particles, and these mists are sprayed onto a card or card material such as a plastic molded product to attach the fine particles to these surfaces. A method for forming a thin film has been developed and used.
[0003]
[Problems to be solved by the invention]
However, after the particles of the surface modifier solution adhered to the card or card material, the particles aggregated, and a uniform and continuous film could not be obtained. If an attempt is made to obtain a uniform and continuous film, the film becomes thick. If the film is thick, the film moves and becomes unstable, the change with time is fast, and the effect may be lost immediately. For this reason, if printing is performed on the treated surface from above or other objects are coated, there is a difference in the adhesion strength between printing and painting between the part with the film and the part without the film, and the printing or painting tends to peel off was there. It was very difficult to form such a uniform and continuous thin film.
[0004]
Therefore, the present invention aims to provide a method for forming an ultra-thin film which improves these drawbacks and makes it possible to form a more uniform and continuous ultra-thin film of an antistatic agent on the surface of a card or card material. It is.
[0005]
[Means for Solving the Problems]
The invention of claim 1 is a method of forming an ultra-thin film of an antistatic agent on the surface of a card or card material, wherein the first liquid comprising a solution containing the antistatic agent as a main agent is made into a mist having a uniform particle size. Then, after spraying on the surface, interspersed with a large number of fine particles of the first liquid on the surface and semi-drying these fine particles, a solvent or main agent not containing the main agent of the first liquid is contained. However, the second liquid consisting of a solution having a smaller content than the first liquid is made into a mist having a uniform particle size, sprayed on the surface, and completely dried to thereby charge the surface of the card or card material. It was set as the ultrathin film formation method to the card | curd or card | curd material which forms the uniform and continuous ultrathin film which consists of an inhibitor. The invention according to claim 2 is the invention according to claim 1, wherein the first liquid composed of a solution containing the antistatic agent as a main agent is made into a mist having a uniform particle size and sprayed on the surface of the card or card material. Before charging, the surface of the card or card material was removed to obtain a clean surface, and then the first liquid was sprayed.
The invention of claim 3 is the method of applying an ultra-thin film to a card or card material in which the second liquid is sprayed a plurality of times in the invention of claim 1 or 2.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
First, the charge on the card surface to be processed is removed by some method to make it unaffected by the charge, and the surface of the card is made clean.
For this purpose, static electricity is removed by applying water and alcohols or, in some cases, a small amount of an antistatic agent to the card surface by spraying mist or rolls. Further, this is washed, or dust and dust are removed by blowing or sucking air. As a result, the card surface is in a clean state not affected by the lines of electric force. The alcohols improve the wettability of the card surface and reduce the surface tension. Of course, some of the antistatic agents have a function of lowering the surface tension of the card surface.
Moreover, the aqueous solution (which may contain alcohol) which consists of an antistatic agent is prepared to 1-8%, and it is set as 1st liquid. In order to obtain an antistatic effect under a general environment, a surface resistance value of 10 ⁹ to 10 ¹¹ Ω is required. For this purpose, the content of the antistatic agent in the first liquid is in the range of 1 to 8%, preferably 5%, and 0.05 to 2 ml is applied per square meter. Also, a solvent containing no antistatic agent as the main ingredient of the first liquid, or a liquid having a lower content than the first liquid is prepared as the second liquid even if the antistatic agent as the main ingredient is contained.
[0007]
Then, as shown in FIG. 1, the card 1 is placed on the belt conveyor 2, the card 1 is warmed to 30 to 50 ° C. by the heater 3, and then moved under the first chamber 4 having a prone shape. Therefore, the first liquid is made into a mist of uniform fine particles having a particle diameter of about 20 μm and sprayed from the inner part of the first chamber 4 toward the card 1 by the nozzle 4a. At that time, the electromagnetic wave generator 5 provided outside the first chamber 4 applies electromagnetic waves to these mists from the inner wall of the first chamber 4 to warm the inside of the first chamber 4 to 45 to 80 ° C., Each particle is adhered to the surface of the card 1 while promoting vaporization of water contained in each particle and advancing atomization. In addition, it may replace with this electromagnetic wave generator 5, and a heat ray generator or an ultrasonic generator may be provided, and a heat ray or an ultrasonic wave may be irradiated to mist.
[0008]
At this time, as shown in FIG. 2, each fine particle becomes a disc-like film 11 having an outer diameter of 3 to 30 μm, and the thickness is often 0.1 to 10 μm. Will be scattered on the surface. Then, the card | curd 1 moves with the belt conveyor 2, is warmed with the warm air or a hot wire of the heater 6, and dries. As a result, these discoid membranes 11 have a high moisture content on the bonding surface with the card 1, and the outer surface thereof begins to dry, and the moisture content gradually decreases. And the antistatic agent of each disk-shaped film | membrane 11 is fixed to the surface of the card | curd 1 partially.
[0009]
Thus, when each disk-shaped film | membrane 11 of a 1st liquid will be in a semi-dry state, the card | curd 1 is turned down and moved under the 2nd chamber 7 of bowl shape. The card 1 is sprayed from the inner part of the first chamber 4 toward the card 1 through the nozzle 4a from the second liquid as a mist of uniform fine particles having a particle diameter of about 20 to 50 μm. At that time, the electromagnetic wave generator 8 provided outside the second chamber 7 applies electromagnetic waves to these mists from the inner wall of the second chamber 7 to warm the inside of the second chamber 7 to 50 ° ± 15 ° C. Each particle is adhered to the surface of the card 1 while promoting vaporization of water contained in each particle and promoting atomization. Further, the surface temperature of the card 1 at that time is set to 20 to 50 ° C.
[0010]
Thus, as shown in FIG. 3, the fine particles of the second liquid are formed between the disk-like film 11 and the disk-like film 11 of the first liquid on the surface of the card 1 or the disk-like film 11 of the first liquid. Adhere on. As a result, the fine particles 12 of the second liquid that are in contact with the disk-like film 11 of the first liquid that has already adhered are dissolved and stretched again by re-dissolving the disk-like film 11 of the first liquid that has already adhered. Are bonded to the fine particles 12 of the second liquid adhering between the disk-shaped film 11 and the disk-shaped film 11, and then the card 1 is moved by the belt conveyor 2, and the solvent 9 is irradiated with hot air and heat rays by the heater 9. Vaporization progresses and agglomerates and does not form aggregates but completely dry. As a result, as shown in FIG. 4, an ultrathin film 13 of an antistatic agent that is uniformly continuous is formed on the surface of the card 1. The ultrathin film 13 has a thickness of 0.01 to 5 μm and may be a film thinner than the wavelength of light.
[0011]
In order to allow each step to proceed while maintaining the uniformity of the film in the spraying process of the second liquid, that is, the film formation by dissolving action, stretching and vaporization (evaporation), the disk of the first liquid When the film-like film 11 is finer and more in number, a stable ultrathin film is formed and solidified. Further, the size (diameter) and thickness of the disc-shaped film vary depending on the content of the antistatic agent in the solution. The temperature difference between the temperature in the first chamber 4 or the second chamber 7 and the temperature of the surface of the card 1 is within 30 ° C. (ideally around 10 ° C. is preferable), and the glass point (TG point) of the card ) It is required that If there is too much temperature difference, the solvent is difficult to evaporate, so the film formation is delayed and the film does not spread. Moreover, although the said embodiment is an ultrathin film formation apparatus of the continuous surface modifier by the belt conveyor 2, this invention is not restricted to these, A batch type thing can also be used.
In the above embodiment, the card is decharged and the dust is removed to make it clean before applying the first liquid. The pretreatment is an essential condition of the present invention. is not. Moreover, in the said embodiment, although the 2nd liquid is sprayed once, you may spray not only once but several times.
[0012]
【The invention's effect】
According to the method of the invention of claim 1 or 3, when spraying the solution of the antistatic agent on the card or card material, the required amount is uniformly scattered as a disk-shaped film and then developed with a homogeneous solvent. By stretching, a uniform and continuous ultrathin film, which was not obtained in the conventional antistatic film formation by mist, can be obtained easily and reliably. Therefore, the uniform and stable function of the antistatic agent can be obtained over a long period of time.
According to the method of the invention of claim 2, in addition to the effect of the invention of claim 1 above, by removing the charge on the surface of the card or card material before processing, the adhesion of dust and dust by electric lines of force. The ultra-thin film of the antistatic agent is formed on a clean surface, so that the resulting ultra-thin film of the antistatic agent has better adhesion to the surface of the card or card material and has a much superior durability. It is done.
[Brief description of the drawings]
FIG. 1 is a side view showing a processing step of an embodiment of the present invention.
FIGS. 2A and 2B are diagrams showing a state in which the first liquid is attached according to the embodiment of the present invention. FIG. 2A is a plan view, and FIG.
FIGS. 3A and 3B are diagrams showing a state in which the second liquid is attached according to an embodiment of the present invention, in which FIG. A is a plan view and FIG.
FIG. 4 is a side sectional view showing a state in which an ultra-thin film is formed on the card surface according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Card 2 Belt conveyor 3 Heater 4 1st chamber 5 Electromagnetic wave generator 6 Heater 7 Second chamber 8 Electromagnetic wave generator 9 Heater 11 Discoid film 12 Fine particle 13 Ultrathin film

Claims (3)

In the method of forming an ultra-thin film of an antistatic agent on the surface of a card or card material, a first liquid composed of a solution containing the antistatic agent as a main agent is made into a mist having a uniform particle size, and sprayed on the surface. After the fine particles of the first liquid are interspersed on the surface, and the fine particles are semi-dried, the content ratio of the first liquid is higher than that of the first liquid even if the solvent does not contain the main ingredient or the main ingredient. The second liquid consisting of a small solution of the above is made into a mist having a uniform particle size, sprayed on the surface, and completely dried, whereby the surface of the card or card material is uniformly and continuously formed of the antistatic agent. A method for forming an ultra thin film on a card or card material, comprising forming an ultra thin film. The first liquid composed of a solution containing the above-mentioned antistatic agent as a main agent is made into a mist having a uniform particle size, and before spraying on the surface of the card or card material, the charge on the surface of the card or card material is removed, 2. The method for forming an ultra thin film on a card or card material according to claim 1, wherein the first liquid is sprayed on a clean surface. The method for forming an ultrathin film on a card or card material according to claim 1 or 2, wherein the second liquid is sprayed a plurality of times.

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