Ink-jet printing head with anti-corrosion coating

Abstract

The utility model relates to an ink-jet printing head with an anti-corrosion coating, and solves the problems that an existing ink-jet printing head pursues the resolution ratio to the utmost extent, an ink channel and a spraying hole of the printing head are not resistant to corrosion, the ink compatibility is poor, and corrosive ink cannot be used. One or more rows of spraying holes are distributed in a front panel of a printing head of the device, a pressure cavity is correspondingly formed in the rear side of each spraying hole, and corrosion-resistant coatings are arranged on the inner walls of the pressure cavities, the hole walls of the spraying holes and the front panel of the printing head. According to the ink-jet printing head, the corrosion-resistant coatings are arranged in the ink-jet printing head and at the positions where the surface of the ink-jet printing head is in direct contact with ink, corrosive ink can be directly used, the ink-jet printing head can also be suitable for liquid with certain corrosivity such as a textile printing and dyeing color fixing agent, and application of the ink-jet printing head to printing and dyeing becomes possible.

Description

TECHNICAL FIELD

[0001] The utility model belongs to ink -jet printing technical field relates to a kind of ink -jet print head structure, especially a kind of ink -jet print head with anticorrosive coating. BACKGROUND

[0002] Inkjet printing is a kind of printing technology that ink droplets are sprayed onto the printing surface through the print head to form a printing pattern. Inkjet printing is low in cost and high in cost performance, and is one of the most common printing methods for people. In recent years, the technology of inkjet printing is developing continuously, and major manufacturers are constantly launching more advanced inkjet printing equipment. The current development direction of inkjet printing is towards high resolution. From the early resolution of 100 dpi to the current 1600 dpi or even higher. The improvement of resolution means the increase of ink dots per unit area, which inevitably leads to the more compact and fine of the print head nozzle. The diameter of the nozzle of the 1600 dpi resolution print head is even as small as about 10 μm, and the single ink spraying amount can be as small as 1 picoliter. In order to pursue the printing resolution to the extreme, to ensure the machining precision of the nozzle, the internal structure of the print head such as pressure chamber and nozzle is basically processed by lithography of raw materials. Such structure is limited by the material properties of the print head itself, and has strong limitations on the selection of ink. It requires that the ink should not be corrosive to the material of the print head. Therefore, the existing inkjet print head has poor compatibility with ink, and cannot adapt to the use of acidic, alkaline and other corrosive inks.

[0003] The current print head coating technology is to set a hydrophobic coating on the outer surface of the print head nozzle to reduce the accumulation and contamination of ink. For example, the Chinese patent with publication number CN 1970300A and title "Method of forming a hydrophobic coating on the surface of an inkjet printhead nozzle plate" was published on May 30, 2007. Another example is the Chinese patent with publication number CN105585949A and title "Anti-wetting low adhesion coating for water-based ink printhead" was published on May 18, 2016. The above disclosed technologies are to coat a hydrophobic layer on the panel outside the print head nozzle to achieve the effect of reducing the accumulation and contamination of ink. CONTENT OF THE UTILITY MODEL

[0004] The utility model solves the problem that the existing inkjet print head pursues the resolution to the extreme, the ink channel and nozzle of the print head are not resistant to corrosion, the ink compatibility is poor, and the corrosive ink cannot be used. A kind of ink -jet print head with anticorrosive coating is provided, an anticorrosive coating is arranged on each surface inside the ink -jet print head that contacts with ink, the compatibility of the ink -jet print head with ink is strengthened, the print head has anticorrosive performance, can be applied to textile printing and dyeing fixing agent and other liquids with certain corrosiveness, so that the ink -jet print head can be applied to textile printing and dyeing.

[0005] The utility model solves its technical problem adopts the technical scheme that a kind of ink-jet print head with anticorrosion coating, the print head front panel is distributed with one or more rows of orifices, pressure chamber is correspondingly provided with in each orifice rear side, the inner wall of pressure chamber, orifice hole wall and print head front panel are all provided with corrosion-resistant coating.

[0006] The device has more selectivity for inkjet printing ink, and can use some acidic, alkaline and corrosive ink. For example, in fabric printing and dyeing, in order to improve the color fastness of the pattern and fabric, a fixing agent is usually used to treat the printed fabric during the printing and dyeing process. The fixing agent is usually alkaline and corrosive. The traditional inkjet print head pursues resolution, and the anti-corrosion performance is poor, so it can only choose neutral ink, which is more expensive and has poor color fastness. The device is provided with corrosion-resistant coating on the inside and surface of the inkjet print head that directly contacts with the ink, so that it can directly use ink with fixing agent or use fixing agent alone to treat the fabric that has been dyed, so that the inkjet printing can be applied to large-scale and rapid fabric printing and dyeing.

[0007] As a preferred, the rear side of the pressure chamber is attached with a filter screen layer, the filter screen layer is uniformly provided with filter holes, the front wall, rear wall and filter hole wall of the filter screen layer are provided with corrosion-resistant coating; the filter hole diameter is not more than the orifice diameter. The filter screen can block some large particles in the ink through the filter holes, to avoid clogging the orifice. The cross section of the pressure chamber is much larger than the orifice cross section, and the rear side of the pressure chamber can correspond to many filter holes, and the clogging of part of the filter holes will not affect the pressure of the pressure chamber.

[0008] As a preferred, the filter hole diameter is 50%-80% of the orifice diameter.

[0009] As a preferred, the filter screen layer is attached to the rear side of the pressure chamber in the rear-attached manner.

[0010] As preferred, the corrosion resistant coating material is one or more of Parylene, PTFE, nickel, aluminum oxide and hafnium oxide. The corrosion resistant material can be a single layer or a multi-layer composite. Parylene is a protective polymer material, which can be deposited in vacuum in gas phase. The good penetration of Parylene active molecules can form a transparent and insulating coating layer with no pinhole, uniform thickness and complete protection on the inside, bottom and around the element, so as to provide a complete and high-quality protective coating for the element to resist the invasion of acid, alkali, salt spray, mold and various corrosive gases. PTFE is polytetrafluoroethylene, also known as Teflon, which is a polymer prepared by polymerization of tetrafluoroethylene as a monomer, and has a chemical formula of (C2F4)n. The material has excellent heat resistance and cold resistance, and can be used for a long time at-180-260 DEG C. The material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. Nickel (Ni) is a transition metal with silver-white luster, good ductility and ferromagnetism. Nickel has good thermal and electrical conductivity, strong plasticity, high temperature resistance, corrosion resistance, chemical stability and strong oxidation resistance.

[0011] As preferred, the corrosion resistant coating material is a single layer material or a multi-layer composite, and the total thickness of the coating material is greater than 50 nm.

[0012] As preferred, the diameter of the nozzle is not less than 30 μm.

[0013] As preferred, the back side of the pressure chamber is provided with a substrate, a flow channel is arranged in the substrate, the flow channel is in liquid communication with the pressure chamber, and the substrate material is one of stainless steel, aluminum alloy, copper alloy, polytetrafluoroethylene, polypropylene and polyvinyl chloride.

[0014] As preferred, the back side of the pressure chamber is provided with a substrate, a flow channel is arranged in the substrate, the back side or the side of the flow channel is provided with an ink inlet, the flow channel is in liquid communication with the pressure chamber, and the inner and outer surfaces of the flow channel and the ink inlet are provided with corrosion resistant coatings.

[0015] As preferred, the inkjet print head is applied to a continuous inkjet printing device.

[0016] The utility model discloses a corrosion resistant coating is arranged in the inside and the surface of inkjet print head and the part with direct contact of ink, can directly use the ink with corrosive property, also can be applicable to the liquid with certain corrosive property such as textile printing and dyeing fixing agent, make inkjet print head be possible to be applied to printing and dyeing. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described in connection with the drawings.

[0018] Figure 1 is a structural schematic view of a printing head without a substrate of the utility model.

[0019] Figure 2 is a single nozzle structure enlarged schematic view of the utility model.

[0020] Figure 3 is a structural schematic view of a printing head with a substrate of the utility model.

[0021] In the figure: 1, printing head, 2, pressure chamber, 3, nozzle, 4, filter screen layer, 5, filter hole, 6, corrosion-resistant coating, 7, substrate, 8, flow channel, 9, ink inlet. DETAILED DESCRIPTION

[0022] The utility model is further described below through specific embodiments and in conjunction with the drawings.

[0023] Embodiment: a jet printing head with a corrosion-resistant coating is applied to continuous jet printing equipment. Figure 1 As shown, the printing head 1 front panel of the device is distributed with one or more rows of nozzles 3, and each nozzle 3 rear side is provided with a pressure chamber 2, and the rear side of the pressure chamber is attached with a filter screen layer 4, and the filter screen layer is uniformly provided with filter holes 5. The filter screen layer 4 is attached to the rear side of the pressure chamber 2 in a rear-attached manner. The filter hole 5 aperture is 50%-80% of the nozzle aperture. In this example, the nozzle aperture is 40 μm, and the filter hole aperture is 28 μm. The pressure chamber 2 can be circular, oval, long-hole type, etc., and the cross-sectional area of the pressure chamber 2 is 10-100 times the cross-sectional area of the nozzle.

[0024] The inner wall of the pressure chamber 2, the nozzle 3 hole wall, the printing head 1 front panel, the front side wall and rear side wall of the filter screen layer and the filter hole wall are all provided with a corrosion-resistant coating 6. The corrosion-resistant coating 6 is one or more of Parylene, PTFE, nickel, aluminum oxide and hafnium oxide. The corrosion-resistant coating 6 can be a single-layer material or a multi-layer composite coating.

[0025] The device printing head is provided with a substrate 7 at the rear side of the pressure chamber, a flow channel 8 is provided in the substrate, an ink inlet 9 is provided at the rear or side of the flow channel, the flow channel is communicated with the pressure chamber to provide printing ink for the pressure chamber, and the inner and outer surfaces of the flow channel and the ink inlet are both provided with a corrosion-resistant coating 6.

[0026] The device is provided with a corrosion-resistant coating at the inside and surface of the jet printing head which are directly contacted with the ink, so that the jet printing head can be directly used with corrosive ink, and can also be applied to fixing agents and other liquids with certain corrosion, so that the jet printing head can be applied to printing and dyeing.

Claims

1. An ink jet printhead with an anticorrosion coating, said printhead having one or more rows of nozzles distributed across the front face of the printhead, characterised in that: The rear side of each nozzle hole is provided with a pressure chamber, the inner wall of the pressure chamber, the nozzle hole wall and the front panel of the print head are provided with a corrosion-resistant coating.

2. The inkjet printhead with an anticorrosion coating according to claim 1, characterized in that: The rear side of the pressure chamber is attached with a filter screen layer, the filter screen layer is uniformly provided with filter holes, the front wall, the rear wall and the filter hole wall of the filter screen layer are provided with a corrosion-resistant coating; the filter hole diameter is not more than the nozzle hole diameter.

3. The inkjet printhead with an anticorrosion coating according to claim 2, characterized in that: The filter hole diameter is 50%-80% of the nozzle hole diameter.

4. An inkjet printhead with an anticorrosion coating according to claim 2 or 3, characterized in that: The filter screen layer is attached to the rear side of the pressure chamber in a rear-attached manner.

5. The inkjet printhead with an anticorrosion coating according to claim 1 or 2 or 3, characterized in that: The corrosion-resistant coating material is one of Parylene, PTFE, nickel, aluminum oxide and hafnium oxide.

6. An inkjet printhead with an anticorrosion coating according to claim 5, characterized in that: The corrosion-resistant coating material is a single-layer material or a multi-layer composite material, and the total thickness of the coating material is greater than 50nm.

7. The inkjet printhead with an anticorrosion coating according to claim 1 or 2 or 3, characterized in that: The nozzle hole diameter is not less than 30μm.

8. The inkjet printhead with an anticorrosion coating according to claim 1 or 2 or 3, characterized in that: The rear side of the pressure chamber is provided with a substrate, a flow channel is arranged in the substrate, the flow channel is in liquid communication with the pressure chamber, and the substrate material is one of stainless steel, aluminum alloy, copper alloy, polytetrafluoroethylene, polypropylene and polyvinyl chloride.

9. The inkjet printhead with an anticorrosion coating according to claim 1 or 2 or 3, characterized in that: The rear side of the pressure chamber is provided with a substrate, a flow channel is arranged in the substrate, the rear or side of the flow channel is provided with an ink inlet, the flow channel is in liquid communication with the pressure chamber, and the inner and outer surfaces of the flow channel and the ink inlet are provided with a corrosion-resistant coating.

10. The inkjet printhead with an anticorrosion coating according to claim 1 or 2 or 3, characterized in that: Applied to continuous inkjet printing equipment.

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