TWI866006B - Defoaming coating method and defoaming coating device used therein - Google Patents

Abstract

A defoaming coating method and a defoaming coating device used therein are used to form a printing layer with a thickness on a carrier surface. The defoaming coating device comprises a frame, a first ink tank, a defoaming roller, a second ink tank, a scraper and a curing unit. The first ink tank is used to spray a printing material on the surface of the carrier in a micro-ink supply manner to form a base layer, and the base layer is not yet solidified. The defoaming roller is used to uniformly roll and press in a state to eliminate the bubbles contained inside, and the second ink tank applies the printing material to the surface of the defoamed base layer again to form the printing layer, and the thickness of the printing layer is controlled by the scraper. Finally, the printing layer is solidified by the curing unit to prevent bubbles from entering the printing layer again, thereby greatly improving the quality of the finished product and effectively reducing the production cost.

Description

Defoaming coating method and defoaming coating device used therein

This creation belongs to the field of printing technology, especially a defoaming coating method and a defoaming coating device used to eliminate bubbles in materials with large fiber pores such as non-woven fabrics or rice paper that are easy to generate bubbles during the printing process, thereby greatly improving the quality of finished products and reducing production costs.

With the advancement of printing technology, a large number of products can be printed in a short time, and the colors are rich and colorful. However, ink is the main colorant used in modern printing. The main components of ink are produced by pigments, binders, fillers, and fillers and desiccants. The most common problem in the printing process is the bubble problem. The following are common causes of foaming: 1. Poor pre-treatment of the carrier, that is, the carrier is not completely cleaned before printing, and bubbles are generated and attached due to dust or oil stains on the surface; 2. The ink itself contains bubbles. Since the ink is prepared, when there are defects in the preparation process or the formula is improperly prepared, bubbles may be generated. Here is the reason for the foaming. Foam is mostly caused by improper ink mixing. When such ink is used for printing, foam will naturally be generated. Third, when additives or solvents are added during the mixing process for stirring, air is mixed into the ink to generate bubbles. After dilution, the ink with low viscosity will naturally defoam, but the ink with high viscosity cannot defoam naturally. Therefore, when printing with low viscosity ink, bubbles may disappear or exist during the process. Fourth, transparent ink contains fewer microparticles of organic pigments, which makes the linking material in the ink easy to foam, making it easier to foam during the printing process. Fifth, too fast printing speed or uneven printing speed is also one of the reasons for the generation of bubbles.

In summary, the presence of these large and small bubbles leads to various defects in the printed products. In order to improve the quality of the products, in addition to the defoaming method of printing ink defoamers, there are also methods such as decompression (vacuuming), static, heating and pressurization on the market to remove the bubbles generated during printing. However, most of these methods require a certain amount of waiting when used, which leads to disadvantages such as low production efficiency and increased energy and production costs. Therefore, it is necessary to eliminate the bubbles in a short time, and adding defoamers is the most suitable method. Defoamers have excellent defoaming and anti-foaming functions for fine bubbles. Although defoamers are advertised to the outside world as having advantages such as small dosage, long anti-foaming time, water dispersibility, excellent adsorption and no effect on transparency, adding defoamers will still increase production costs. On the other hand, the use of vacuuming is expensive because of the equipment cost, and printing in a vacuum state will also increase the difficulty of printing invisibly. It is known that defoaming technology has its problems in use, so it is necessary to improve it.

In view of this, one of the purposes of this invention is to provide a defoaming coating method and a defoaming coating device used therein. The defoaming coating device includes a frame, a first ink tank, a defoaming roller, a second ink tank, a scraper and a curing unit. The first ink tank is used to spray a printing material on a carrier surface in a micro-ink supply manner, and the defoaming roller is used to roll and press to eliminate bubbles in the printing material. Then, a printing layer is coated by the second ink tank. The scraper controls the thickness of the printing layer. After curing, bubbles in the printing layer can be avoided, thereby greatly improving the quality of the finished product and effectively reducing the production cost.

To achieve the above purpose, the defoaming coating method of the present invention is used to form a printing layer with thickness on the surface of a carrier, which includes the following steps: using a micro-ink supply method to spray a printing material of an appropriate amount on the surface of the carrier to form a base layer, and the base layer is in a state of not yet solidified; using downward pressure to uniformly roll the base layer to eliminate the bubbles contained in the base layer and evenly coat it on the surface of the carrier; coating the printing material on the surface of the defoamed base layer for the second time to form the printing layer; using a scraper to evenly scrape off the printing material to control the thickness of the printing layer; and curing the printing layer to prevent bubbles from entering the printing layer again.

In one embodiment, the defoaming coating method of the invention further comprises a step of attaching a release paper, wherein the release paper is attached after the printed layer is solidified as a surface protection means. The defoaming coating method further comprises a step of rolling up, wherein after the step of attaching the release paper is completed, the printed carrier is rolled up and packaged. Furthermore, the carrier can be selected from non-woven fabrics, rice paper and other fiber fabrics. Furthermore, in the step of "using downward pressure to uniformly roll the base layer to eliminate the bubbles contained in the base layer and evenly spread it on the surface of the carrier", the printed material is pressed onto the carrier through a roller with adjustable pressure to achieve a short-distance defoaming effect.

In another embodiment, a defoaming coating device using the defoaming coating method of the invention comprises: a frame for unfolding the carrier, and a conveying unit is provided at the front and rear ends of the frame respectively for conveying the carrier forward; a first ink tank is provided on the frame, and the first ink tank sprays the printing material on the surface of the carrier to form the base layer; a defoaming roller is provided on the frame and located on one side of the first ink tank, and the defoaming roller is provided with a lifting mechanism to drive the defoaming roller to generate downward pressure to uniformly roll the base layer to eliminate bubbles contained in the base layer. , and evenly coats the surface of the carrier; a second ink tank is provided on the frame and located on one side of the defoaming roller, and the second ink tank coats the printing material again on the surface of the base layer after defoaming to form the printing layer; a scraper is provided on the frame and located on one side of the second ink tank, and when the carrier is driven forward, the scraper flattens the printing material and extends it to both sides to adjust the thickness of the printing layer; and a curing unit is provided on the frame and located on one side of the scraper, and the curing unit is used to heat or UV irradiate the printing material to solidify it.

The defoaming coating device of the invention has an upper release paper unit, which is arranged on the frame and located on one side of the curing unit, and the upper release paper unit is provided with a feeding wheel to store the release paper, and a transfer wheel to press the release paper onto the surface of the printing layer. In addition, there is a winding unit, which is arranged on the frame and located on one side of the upper release paper unit, and the winding unit is provided with a receiving wheel to wind the carrier with the release paper attached into the receiving wheel. In addition, the first ink tank is provided with an ink jet nozzle that can control the liquid output, and can slightly control the spraying amount of the printing material. The thickness of the printing layer is controlled by the amount of the printing material placed in the second ink tank and the height of the scraper.

S1~S7: Steps

1: Carrier

2: Printing layer

21: Printing materials

3: Basal layer

4: Release paper

5: Defoaming coating device

51: Rack

511:Transportation unit

52: First ink tank

521: Inkjet nozzle

53: Defoaming roller

531: Lifting mechanism

54: Second ink tank

55: Scraper

56: Curing unit

57: Upper release paper unit

571:Feeding wheel

572: Transfer wheel

58: Retracting unit

581: Rewinding wheel

Figure 1 is a flowchart of the steps in implementing the preferred embodiment of this invention.

Figure 2 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 1.

Figure 3 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 2.

Figure 4 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 3.

Figure 5 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 4.

Figure 6 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 5.

Figure 7 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 6.

Figure 8 is a schematic diagram of the state of the preferred embodiment of this invention corresponding to step 7.

Figure 9 is a schematic diagram of the structure of the defoaming coating device used in the preferred embodiment of this invention.

In order to enable you, the review committee, to clearly understand the content of this work, please refer to the following description and diagram.

Please refer to Figures 1, 2 to 9, which are the step flow charts of the preferred embodiment of the present invention, and the state diagrams of the corresponding steps. As shown in the above figures, the defoaming coating method of the present invention is used to form a printing layer 2 with a thickness on the surface of a carrier 1, wherein the carrier 1 is selected from fiber fabrics such as non-woven fabrics and rice paper. Because the fiber pores of such fabrics are large, air often accumulates inside the pores during printing, resulting in bubbles during printing, and as the printing layer 2 solidifies, it causes poor printing problems. Therefore, the defoaming coating method of the present invention includes the following steps:

S1: Use the micro-ink supply method to spray a printing material 21 of an appropriate amount onto the surface of the carrier 1 to form a base layer 3, and the base layer 3 is in a state where it has not yet solidified. It should be noted that since the micro-ink supply method sprays the printing material 21 in the form of small particles, in this step, most of the pores of the carrier 1 will be infiltrated and filled by the printing material 21 without generating bubbles.

S2: Use downward pressure to roll the base layer 3 uniformly to eliminate the bubbles contained in the base layer 3 and evenly coat it on the surface of the carrier 1. It should be noted that in this step, the base layer 3 is rolled by a roller with adjustable pressure. In addition to pressing the printed material 21 onto the carrier 1, the micro-ink supply method can fully fill the pores of the carrier 1. After downward pressure and rolling, the bubbles can be effectively eliminated and the short-distance defoaming effect can be achieved.

S3: The printing material 21 is applied to the surface of the defoamed base layer 3 for the second time to form the printing layer 2. In this step, since the base layer 3 has been defoamed, its surface forms a smooth plane without any bubbles remaining. At this time, when the printing material 21 is applied for the second time, it is naturally not easy or will not generate bubbles.

S4: Use a scraper to evenly scrape off the printed material 21 to control the thickness of the printed layer 2. Controlling the height of the scraper can diffuse the printed material that exceeds the height of the scraper to the surrounding area. After actual testing, it was found that such an adjustment method can also effectively save the amount of the printed material 21 used and improve the production quality of the finished product.

S5: Curing the printing layer 2 to prevent air bubbles from entering the printing layer 2 again. After the printing layer 2 is cured, a protective film is formed on its surface to prevent air from entering.

S6: Paste a release paper 4, which is pasted after the printed layer 2 is cured as a surface protection means. Although the printed layer 2 is still partially sticky after curing, it is possible to adhere to dust and cotton wool in the air. Therefore, in order to keep its surface clean, it is still necessary to paste a layer of release paper 4 as a complete protection.

S7: Rewinding. After the release paper 4 is attached, the printed carrier 1 is stored and packaged in a rolled form.

Furthermore, the present inventors have designed a defoaming coating device 5 corresponding to the above-mentioned defoaming coating method, which includes: a frame 51 for unfolding the carrier 1, and a conveying unit 511 is respectively provided at the front and rear ends of the frame 51 for conveying the carrier 1 to move forward; a first ink tank 52 is provided on the frame 51, and the first ink tank 52 sprays the printing material 21 on the surface of the carrier 1 to form the base layer. 3. The first ink tank 52 is provided with an ink jet nozzle 521 capable of controlling the amount of liquid discharged, and can slightly control the amount of the printed material 21 sprayed; a defoaming roller 53 is provided on the frame 51 and located on one side of the first ink tank 52, and the defoaming roller 53 is provided with a lifting mechanism 531 to drive the defoaming roller 53 to generate downward pressure and uniformly roll the base layer 3 to eliminate bubbles contained in the base layer 3. , and evenly coats the surface of the carrier 1; a second ink tank 54 is provided on the frame 51 and is located on one side of the defoaming roller 53, and the second ink tank 54 coats the printing material 21 again on the surface of the base layer 3 after defoaming to form the printing layer 2; a scraper 55 is provided on the frame 51 and is located on one side of the second ink tank 54, and when the scraper 55 is driven forward by the carrier 1, The scraper 55 is used to scrape the printed material 21 flat and extend it to both sides to adjust the thickness of the printed layer 2. The thickness of the printed layer 2 is controlled by the amount of the printed material 21 placed in the second ink tank 54 and the height of the scraper 55; and a curing unit 56 is provided on the frame 51 and located on one side of the scraper 55, and the curing unit 56 is used to heat or UV irradiate the printed material 21 to solidify it.

In addition, the defoaming coating device 5 of the present invention further has an upper release paper unit 57, which is disposed on the frame 51 and located on one side of the curing unit 56, and the upper release paper unit 57 is provided with a feeding wheel 571 to store the release paper 4, and a transfer wheel 572 to press the release paper 4 to adhere to the surface of the printing layer 2. Furthermore, the defoaming coating device 5 of the present invention also has a winding unit 58, which is disposed on the frame 51 and located on one side of the upper release paper unit 57, and the winding unit 58 is provided with a winding wheel 581 to wind the carrier 1 with the release paper 4 attached thereto into the winding wheel 581.

In summary, the defoaming coating method and the defoaming coating device 5 used in the present invention, after the above steps are operated, can form a unified production process for the manufacturing processes such as defoaming and coating, thereby achieving the purpose of improving its production efficiency and finished product quality, and reducing the manufacturing cost during production. At the same time, the products produced will not only be free of bubbles, but also maintain the transparent material effect when using the transparent printing material 21. Compared with the traditional use of defoaming agents, not only the time required for defoaming is short, but also the use of defoaming agents is eliminated to reduce the manufacturing cost.

However, the above is only the best implementation example of this creation, and is not used to limit the scope of implementation of this creation. Therefore, those who have common knowledge in the relevant technical field, or those who are familiar with this technology and make equivalent or easy changes, should be covered by the patent scope of this creation without departing from the spirit and scope of this creation.

S1~S7: Steps

Claims (8)

A defoaming coating method is used to form a printing layer with a thickness on the surface of a carrier, which includes the following steps: using a micro-ink supply method to spray a printing material of an appropriate amount on the surface of the carrier to form a base layer, and the base layer is in a state of not solidifying; using downward pressure to uniformly roll the base layer to eliminate the gas contained in the base layer. The printing material is applied to the surface of the substrate after defoaming for the second time to form the printing layer; the printing material is evenly scraped off with a scraper to control the thickness of the printing layer; the printing layer is solidified to prevent bubbles from entering the printing layer again; and a release paper is attached to the printing layer after solidification as a surface protection means. The defoaming coating method as described in claim 1 further includes a rolling step. After the release paper pasting step is completed, the printed carrier and the release paper are stored and packaged in a rolling manner. The defoaming coating method as described in claim 2, wherein the carrier is selected from fiber fabrics such as non-woven fabrics, rice paper, etc. As described in claim 3, in the step of "uniformly rolling the base layer using downward pressure to eliminate bubbles contained in the base layer and evenly coating it on the surface of the carrier", the printing material is pressed onto the carrier by a roller with adjustable pressure to achieve a short-distance defoaming effect. A defoaming coating device using the defoaming coating method described in claim 1, comprising: a frame for unfolding the carrier, and a conveying unit is provided at the front and rear ends of the frame respectively for conveying the carrier forward; a first ink tank is provided on the frame, and the first ink tank sprays the printing material on the surface of the carrier to form the base layer; a defoaming roller, arranged on the frame and located on one side of the first ink tank, and the defoaming roller is provided with a lifting mechanism to drive the defoaming roller to generate downward pressure to uniformly roll the base layer to eliminate the bubbles contained in the base layer and evenly coat the base layer on the surface of the carrier; a second ink tank, arranged on the frame and located on the defoaming roller On one side, the second ink tank applies the printing material again on the surface of the base layer after defoaming to form the printing layer; a scraper is arranged on the frame and located on one side of the second ink tank, and when the scraper is driven forward by the carrier, the printing material is flattened and extended to both sides by the scraper to adjust the thickness of the printing layer; a curing unit is arranged on the frame and located on one side of the scraper, and the curing unit is used to heat or UV irradiate the printing material to solidify it; and an upper release paper unit is arranged on the frame and located on one side of the curing unit, and the upper release paper unit is provided with a feeding wheel to store a release paper, and a transfer wheel to press the release paper to adhere to the surface of the printing layer. The defoaming coating device as described in claim 5 further comprises a winding unit, which is arranged on the frame and located on one side of the upper release paper unit, and the winding unit is provided with a winding wheel to wind the carrier with the release paper attached thereto into the winding wheel. The defoaming coating device as described in claim 6, wherein the first ink tank is provided with an ink jet nozzle capable of controlling the amount of liquid discharged, and the amount of the printed material sprayed can be controlled in small amounts. The defoaming coating device as described in claim 7, wherein the thickness of the printed layer is controlled by the amount of the printed material placed in the second ink tank and the height of the scraper.