TWI702153B - A screen printing nozzle device - Google Patents

Abstract

The present invention provides a screen printing nozzle device, wherein a scraper and an ink reclaiming blade are oppositely arranged to form a shot cylinder where a gap between the two can be injected. A heater is arranged outside the injection cylinder. After injecting the liquid or solid printing material into the injection cylinder, the printing material is thawed or melted by the heater, and then flows out from the bottoms of the injection cylinder to a screen placed on a printing platform. The injection cylinder reciprocates on the printing platform. After the printing material has flowed onto the screen, the scraper applies pressure on the screen to pass the printed material through the screen printing onto the printing platform. The invention can also use the scraper and the ink reclaiming blade as electrodes, and expand the application to plastic film forming and polarization.

Description

Screen printing nozzle device

The invention relates to an inkjet device, in particular to a screen printing nozzle device applied to screen printing.

The screen printing machine is mainly composed of a transmission device, a printing plate device, a printing device, a printing platform, a plate counter mechanism, a drying device, and an electrical control device. The squeegee and ink return of the printing device are the main actions for performing screen printing. The ink squeegee system and the ink return system are usually installed on the squeegee carriage. During the reciprocating motion, the squeegee and the ink return are alternately raised and lowered. The actions of scraping and returning ink are realized respectively. The printing material is pressed by the squeegee and printed on the printing platform through the screen. When the ink is returned, the excess printing material will be scraped back to the original position by the ink returning knife for repeated use.

In addition, the film forming process on the printing platform currently uses Spray coating/Slit coating/Melt coating... etc., but if the printing material is plastic (such as PVDF), the piezoelectric properties of PVDF will cause problems after polarization. There has been a significant growth. The produced film needs to be processed by a polarization process. At present, it is impossible to combine the printing process with the polarization process. Therefore, it is impossible to use special materials such as PVDF on a general screen printing machine.

Therefore, the present invention provides a screen printing nozzle device, which effectively solves the above-mentioned problems. The specific structure and implementation methods will be described in detail below:

The main purpose of the present invention is to provide a screen printing nozzle device, which combines a scraper and an ink-returning knife, and uses the gap between the scraper and the ink-returning knife as a feeding barrel for feeding, omitting the setting of an independent feeding barrel.

Another object of the present invention is to provide a screen printing nozzle device, which is equipped with a heater on the outside of the injection cylinder, so that the printing material stored at low temperature is heated and thawed, and there is no need to wait for thawing at room temperature, resulting in lengthy production time, or It is heated and thawed before filling, but it is thawed immediately during the filling process to shorten the process time.

Another object of the present invention is to provide a screen printing nozzle device, which is further equipped with a roller type crusher above the injection cylinder to perform preliminary cutting and crushing of irregular printed materials, so that the printed materials can be turned into small units, which is easy to thaw.

Another object of the present invention is to provide a screen printing nozzle device, which can be used for general screen printing and can also be connected to a power source to produce a polarization effect on printed materials, which is suitable for forming and polarization of plastic films, and then The screen printing process and the polarization of the plastic film are integrated, and the scraper and the ink-returning knife can be used as electrodes.

Another object of the present invention is to provide a screen printing nozzle device, which is provided with a recycling bucket at one end of the printing platform. After the printing material is applied to the printing platform and undergoes a printing process with a squeegee, the excess printing material will be pushed by the ink-returning knife. To the recycling bin, so the printed materials can be recycled and reused to avoid waste.

In order to achieve the above-mentioned objective, the present invention provides a screen printing nozzle device, which includes: an injection cylinder, which is composed of a scraper and an ink-returning knife, using the gap between the scraper and the ink-returning knife as Where the printing material is injected, a heater is provided on the outer side of the injection cylinder. After liquid or solid printing material is injected into the injection cylinder, the printing material is thawed or melted from the bottom of the injection cylinder. A discharge port flows out; a printing platform is set under the injection cylinder, a printed matter is placed on the printing platform, and the injection cylinder reciprocates and moves in parallel above the printing platform; and a screen plate is set on the printing platform To receive the printing material flowing from the injection cylinder, and the squeegee on the injection cylinder prints the printing material on the printed matter through the screen.

According to an embodiment of the present invention, one end of the printing platform is provided with a recycling bucket, and the excess printing material on the screen is scraped off into the recycling bucket by the ink recovery knife on the injection cylinder.

According to an embodiment of the present invention, the discharge port is provided with a valve to control the outflow of the printing material.

According to an embodiment of the present invention, the ends of the scraper and the ink-returning knife are relatively bent. In a preferred embodiment, the angle between the squeegee and the screen is 77 degrees, and the angle between the ink-returning knife and the screen is 88 degrees.

According to the embodiment of the present invention, it further includes a roller mill, which is arranged at one of the inlets of the injection cylinder, and when the printed material is irregular, the printed material is subjected to preliminary cutting and crushing processing .

According to the embodiment of the present invention, the squeegee and the ink-returning blade are made of metal, and the printing platform is made of metal. Therefore, after they are connected to a power source, the printed material can be subjected to contact or non-contact polarization processing.

Continuing, the squeegee or the ink-returning knife is connected to a power source, and the printing platform is connected to the other end of the power source. After the power is turned on, the squeegee or the ink-returning knife that is energized contacts the screen and applies the contact points on the screen The voltage is used to produce a polarization effect, and the printed material is subjected to contact polarization treatment. Or, after power-on, a pressurized electric field is formed between the injection cylinder and the printing platform to perform non-contact polarization treatment on the printing material during the printing process.

In addition, during non-contact polarization processing, a grid grid is further included between the printing platform and the injection cylinder to make the pressurized electric field uniform, so that the printed material is in the uniform pressurized electric field Be completely polarized.

According to an embodiment of the present invention, the printing platform is a steel plate, and a glass and a heating platform are provided below.

The present invention provides a screen printing nozzle device, which can transfer liquid printing material to the printed matter on the printing platform through the screen. The screen is usually a mesh material, such as cotton silk cloth, silk silk cloth or metal The present invention can be used not only for general screen printing, but also for film formation and polarization of plastics.

As shown in Figure 1, it is a schematic diagram of a first embodiment of a screen printing nozzle device of the present invention. The screen printing nozzle device 10 includes an injection cylinder 12, a doctor blade 122, a return ink knife 124, and a heater. 14. A printing platform 16 and a screen 18, in which the scraper 122 and the ink-returning knife 124 are arranged oppositely, and the intermediate gap between the two in the printing material is fed, so it is equivalent to the scraper 122 and the ink-returning knife 124 to form the injection cylinder 12 , And the inlet 126 is provided with a thread 28; the heater 14 is provided on the outside of the injection barrel 12. In a preferred embodiment, the heater 14 is surrounded on the outside of the injection barrel 12. Because some printing materials need to be It is stored in a low temperature environment, and it cannot be printed in a frozen state. It needs to be heated and thawed or waited for thawing at room temperature, which makes the printing time tedious. However, the present invention directly installs the heater 14 on the outside of the injection cylinder 12 to make the scraper 122 And the temperature of the ink-returning knife 124 rises. When the frozen solid printing material enters from the inlet 126 above the injection cylinder 12, it will start to thaw or melt into a liquid when it comes into contact with the high temperature injection cylinder 12. The discharge port 128 below the injection barrel 12 flows out.

The screen 18 and the printing platform 16 are set under the injection cylinder 12. The printed matter (not shown in the figure) is placed on the printing platform 16, and the screen 18 is placed on the printed matter. When the printing material flows out from the injection cylinder 12 to the screen After the plate 18, the printing material is scraped through the screen plate 18 by the squeegee 122 and transferred to the printed matter below. A recycling bucket 22 is provided at one end of the printing platform 16, and the injection cylinder 12 is reciprocated and parallel to the printing platform 16. Moving, the excess printing materials will be pushed by the ink-returning knife 124 to the recycling bin 22 for collection and reuse. Therefore, the printing materials in this case can be recycled to avoid waste.

In addition, a valve 129 is provided at the discharge port 128 (ie, nozzle) below the injection cylinder 12 to control the outflow of the printing material. Especially when the heater is turned on, the valve 129 can be closed, so that the printing material will be evenly heated in the injection cylinder 12.

Below the printing platform 16 is a glass 24, and a heating platform 26 can also be arranged under the glass 24 to keep the printing material in a liquid state.

If the printing material is a frozen solid, it may be larger and irregular and cannot enter the injection cylinder 12 to be heated. Therefore, a roller mill 20 can be installed on the injection cylinder 12, which is set at One of the inlets 126 of the injection cylinder 12 is used to perform preliminary cutting and crushing treatment on the printed material, and crush it into small units. In addition to the size of the injection cylinder 12, it can also be quickly melted by the heater 14. speed. For the shape of the rollers of the roller mill 20, please refer to the perspective view and side view of Fig. 4A and Fig. 4B.

The difference between the first embodiment shown in Figure 1 and the second embodiment shown in Figure 2 is that the feed opening 126 is laid with a thread 28, or a silk or sheet 30, and the cloth laid at the entrance 126 will be different. Affect the position of the roller mill 20.

Figures 3A and 3B are respectively a plan view and a cross-sectional view of the injection cylinder 16 in the screen printing nozzle device 10 of the present invention. It can be clearly seen from the figures that the scraper 122 and the ink-returning knife 124 are long, sheet-shaped knives. The ends of the scraper 122 and the ink recirculation knife 124 are bent in opposite directions. In a preferred embodiment, the angle between the doctor blade 122 and the screen 18 is 77 degrees, and the angle between the ink recirculation blade 124 and the screen 18 is 88 degrees.

Since some special plastics (such as PVDF) need to be polarized by applying a uniform electric field during the printing process, the general screen printing device cannot do the polarized processing and cannot handle the printing of these special plastics. The present invention solves this problem. problem. In the present invention, the squeegee 122 and the ink-returning knife 124 are made of metal, and the printing platform 16 is also a metal material (such as steel plate). Therefore, after the squeegee 122 or the ink-returning knife 124 and the printing platform 16 are connected to the power supply, the printing can be performed. The material is subjected to contact or non-contact polarization treatment. For details, please refer to FIG. 5, which is a schematic diagram of the screen printing nozzle device 10 of the present invention performing non-contact electric field polarization.

In addition, the screen printing nozzle device 10 of the present invention can be externally connected to an electric field, with the scraper 122 or the ink-returning knife 124 as the positive electrode, and the printing platform 16 as the negative electrode connected to a power supply 32. After being powered on, it is between the injection cylinder 12 and the printing platform 16. A pressurized electric field is formed, and a grid grid 34 is added between the printing platform 16 and the injection cylinder 12. After the grid grid 34 is turned on, the applied pressurized electric field can be uniformized, so that the printed material can be uniform The polarization in the pressurized electric field is complete. In Figure 5, when V>V _g is the tip discharge mode, when V=V _g is the stable voltage mode, the voltages of V and V _{g are} controllable, ranging from 0V to 15kV, and the voltage of the grid grid 34 is provided by V _g When the gas spray gun 36 provides free electrons, because the scraper 122 or the ink recirculation knife 124 is the positive electrode, the negative ions will be on the upper side, and the free negative ions discharged at the tip can be uniformly controlled after passing through the grid grid 34 and placed on the screen 18. A dipole chain with positively charged ions at the top and negatively charged ions at the bottom is formed on the top to make PVDF uniform and permanent polarization.

Figure 6 is a schematic diagram of the screen printing nozzle device 10 of the present invention for contact electric field polarization. Similar to the principle of Figure 5, contact polarization can also be applied to the screen printing process. First, an external power supply 32 (voltage source ) On the squeegee 122 or the ink-returning knife 124 and the printing platform 16, for example, the ink-returning knife 124 is connected to the positive electrode of the power supply 32, and the printing platform 16 is connected to the negative electrode of the power supply 32. The screen can be replaced by a grid grid 34, which is not necessary after power-on Specifically, the gate grid 34 is turned on, and the squeegee 122 or the ink recirculation blade 124 is in contact with the gate grid 34 during printing, and an external voltage is applied to the contact point to produce a polarization effect.

To sum up, the screen printing nozzle device of the present invention combines the scraper and the ink-returning knife, and uses the gap between the scraper and the ink-returning knife as the feeding barrel for feeding, omitting the setting of the independent feeding barrel; the heater is directly It is located on the outside of the injection cylinder. When the valve of the nozzle is closed, the printing material can be heated and thaw directly. A roller mill can be installed above the injection cylinder to perform preliminary cutting and crushing treatment on irregular printing materials. The material becomes a small unit to speed up the thawing speed to shorten the process time; in addition, the present invention uses a recycling bucket at one end of the printing platform to push the remaining materials to the recycling bucket, so that the printing materials can be recycled and reduce waste; , The present invention also integrates polarization processing into the screen printing nozzle device, and uses scrapers and ink-returning knives as electrodes. Therefore, the printing materials can also be selected from plastics that require polarization processing, and include contact power plant polarization and non-contact The two modes of polarization in the power plant expand the scope of application of the invention.

Only the above are merely preferred embodiments of the present invention, and are not used to limit the scope of the present invention. Therefore, all equivalent changes or modifications made in accordance with the characteristics and spirit of the application scope of the present invention shall be included in the patent application scope of the present invention.

10: Screen printing inkjet device 12: Injection barrel 122: Scraper 124: Back Ink Knife 126: Inlet 128: Outlet 129: Valve 14: heater 16: Printing platform 18: Screen version 20: Roller grinder 22: recycling bin 24: glass 26: Heating platform 28: Silk thread 30: Silk or flakes 32: Power 34: grid grid 36: Gas spray gun

Figure 1 is a schematic diagram of a first embodiment of the screen printing nozzle device of the present invention. Figure 2 is a schematic diagram of a second embodiment of the screen printing nozzle device of the present invention. Figures 3A and 3B are respectively a top view and a cross-sectional view of the injection barrel in the screen printing nozzle device of the present invention. Figures 4A and 4B are respectively a perspective view and a side view of the roller of the roller mill in the screen printing nozzle device of the present invention. Figure 5 is a schematic diagram of the non-contact electric field polarization of the screen printing nozzle device of the present invention. Figure 6 is a schematic diagram of the contact electric field polarization of the screen printing nozzle device of the present invention.

10: Screen printing inkjet device

12: Injection barrel

122: Scraper

124: Back Ink Knife

126: Inlet

128: Outlet

129: Valve

14: heater

16: Printing platform

18: Screen version

20: Roller grinder

22: recycling bin

24: glass

26: Heating platform

28: Silk thread

Claims (13)

A screen printing nozzle device includes: an injection cylinder, which is composed of a scraper and an ink-returning knife. The gap between the scraper and the ink-returning knife is used as a printing material injection point. A heater is provided on the outer side of the injection barrel. After liquid or solid printing material is injected into the injection barrel, the printing material is thawed or melted by the heater and flows out from an outlet at the bottom of the injection barrel; A platform is set under the injection cylinder, a printed matter is placed on the printing platform, and the injection cylinder reciprocates and moves in parallel above the printing platform; and a screen is installed on the printing platform to accept the injection The printing material flowing out of the cylinder, and the squeegee on the injection cylinder prints the printing material on the printed matter through the screen. A screen printing nozzle device includes: an injection cylinder, which is composed of a scraper and an ink-returning knife. The gap between the scraper and the ink-returning knife is used as a printing material injection point. A heater is provided on the outer side of the injection barrel. After liquid or solid printing material is injected into the injection barrel, the printing material is thawed or melted by the heater and flows out from an outlet at the bottom of the injection barrel; A platform is set under the injection cylinder, a printed matter is placed on the printing platform, and the injection cylinder reciprocates and moves in parallel above the printing platform; and a screen is installed on the printing platform to accept the injection The printing material flows out of the cylinder, and the squeegee on the injection cylinder prints the printing material on the printed matter through the screen; wherein, the printing platform is a steel plate, and a glass and a heating platform are arranged below. A screen printing nozzle device includes: An injection cylinder, which is composed of a scraper and an ink-returning knife. The gap between the scraper and the ink-returning knife is used as the injection point for printing materials. A heating is provided on the outside of the injection barrel. After the liquid or solid printing material is injected into the injection cylinder, the printing material is thawed or melted by the heater and then flows out from a discharge port at the bottom of the injection cylinder; a printing platform is set on the injection cylinder Below, a printed matter is placed on the printing platform, and the injection cylinder moves reciprocally and parallelly above the printing platform; and a screen is set on the printing platform to receive the printing material flowing out of the injection cylinder, and The squeegee on the injection cylinder prints the printing material on the printed matter through the screen; wherein the included angle between the ink-returning knife and the screen is larger than the included angle between the squeegee and the screen. For the screen printing nozzle device of claim 1 or 2 or 3, wherein one end of the printing platform is provided with a recycling bucket, and the excess printing material on the screen is scraped off by the ink recycling knife on the injection cylinder The recycling bin. The screen printing nozzle device according to claim 1 or 2 or 3, wherein the discharge port is provided with a valve to control the outflow of the printing material. The screen printing nozzle device according to claim 1 or 2 or 3, wherein the ends of the scraper and the ink-returning knife are relatively bent. The screen printing nozzle device described in claim 1 or 2 or 3 further includes a roller mill, which is set at one of the inlets of the injection cylinder. When the printed material is irregular, The printing material undergoes preliminary cutting and crushing treatment. The screen printing nozzle device according to claim 1 or 2 or 3, wherein the squeegee and the ink-returning blade are made of metal, and the printing platform is made of metal. The screen printing nozzle device according to claim 8, wherein the scraper or the ink return knife is connected to an electric Source, the printing platform is connected to the other end of the power source, and a pressurized electric field is formed between the injection cylinder and the printing platform after being energized to perform non-contact polarization treatment on the printing material during the printing process. The screen printing nozzle device according to claim 9, wherein a grid grid is further included between the printing platform and the injection cylinder to make the pressurized electric field uniform, so that the printed material is in a uniform pressurized electric field It is completely polarized. The screen printing nozzle device according to claim 8, wherein the squeegee or the ink-returning knife is connected to a power source, the printing platform is connected to the other end of the power source, and the squeegee or the ink-returning knife that is powered on contacts the screen plate , Apply voltage to the contact points on the screen to produce the effect of polarization, and perform contact polarization treatment on the printed material. The screen printing nozzle device of claim 1 or 2 or 3, wherein the angle between the scraper and the screen is 77 degrees. The screen printing nozzle device according to claim 1 or 2 or 3, wherein the included angle between the ink recirculation knife and the screen is 88 degrees.

Images