CN116330816A - Automatic change packaging film surface pattern printing device - Google Patents

Automatic change packaging film surface pattern printing device Download PDF

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Publication number
CN116330816A
CN116330816A CN202310474617.6A CN202310474617A CN116330816A CN 116330816 A CN116330816 A CN 116330816A CN 202310474617 A CN202310474617 A CN 202310474617A CN 116330816 A CN116330816 A CN 116330816A
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CN
China
Prior art keywords
roller
scraper
ink
cleaning cotton
packaging film
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310474617.6A
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Chinese (zh)
Inventor
董建华
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Zhejiang University of Finance and Economics
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Zhejiang University of Finance and Economics
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Filing date
Publication date
Application filed by Zhejiang University of Finance and Economics filed Critical Zhejiang University of Finance and Economics
Priority to CN202310474617.6A priority Critical patent/CN116330816A/en
Publication of CN116330816A publication Critical patent/CN116330816A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

The invention discloses an automatic packaging film surface pattern printing device, which is provided with a plate frame, wherein the bottom of the plate frame is provided with an ink box, a plate roller is arranged above the ink box, and a film winding roller is arranged above the plate roller; the printing ink scraper is arranged on one side of the plate roller at the input side of the film winding roller and is used for carrying out primary scraping treatment on printing ink on the roller surface of the plate roller; the printing ink cleaning cotton belt is arranged on one side of the plate roller between the printing ink scraper and the input side of the film winding roller and is used for carrying out secondary scraping treatment on printing ink on the roller surface of the plate roller.

Description

Automatic change packaging film surface pattern printing device
Technical Field
The invention relates to the technical field of printing, in particular to an automatic packaging film surface pattern printing device.
Background
The pattern printing on the surface of the packaging film is a common packaging decoration technology, which can add aesthetic feeling to the packaged product and improve the brand value. The existing printing devices mainly comprise various technologies such as flexographic printing, relief printing, intaglio printing, screen printing and the like, wherein the flexographic printing is one of the most widely used.
In flexographic printing processes, the size of the gap between the doctor blade and the plate roll is critical to the printing performance. If the gap is too small, the ink cannot be fully coated on the layout, and the printed pattern is not full and clear; if the gap is too large, ink consumption may increase, and problems such as ghost images, blurring, etc. of the printed pattern may be caused; in addition, when the doctor blade in the prior art is contacted with the surface of the plate roller for a long time, certain scraping damage can be caused to the surface of the plate roller, so that the surface of the plate roller is not smooth, the scraping quality of ink scraping on the surface of the plate roller is affected, and the printing quality is affected.
Accordingly, one skilled in the art would be able to provide an automated packaging film surface pattern printing device that solves the problems set forth in the background.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: an automated packaging film surface pattern printing apparatus, comprising:
the printing ink box is arranged at the bottom of the mounting plate frame, a plate roller is arranged above the printing ink box, and a film winding roller is arranged above the plate roller;
the printing ink scraper is arranged on one side of the plate roller at the input side of the film winding roller and is used for carrying out primary scraping treatment on printing ink on the roller surface of the plate roller;
the printing ink cleaning cotton belt is arranged on one side of the plate roller between the printing ink scraper and the input side of the film winding roller and is used for carrying out secondary scraping treatment on printing ink on the roller surface of the plate roller.
The invention is further provided with: the ink doctor blade includes:
the upper side and the lower side of one side end surface of the knife board seat are respectively provided with a rotatable first scraper and a rotatable second scraper;
one end of the elastic rod I is hinged with the upper side surface of the knife board seat, and the other end of the elastic rod I is hinged with the scraper I and is used for elastically propping the scraper I to contact the roller surface of the plate roller;
and one end of the telescopic rod is hinged with the lower side surface of the knife board seat, and the other end of the telescopic rod is hinged with the second scraper for regulating and controlling the interval distance between the second scraper and the roller surface of the plate roller.
The invention is further provided with: the first scraper comprises a baffle, one end of the baffle is hinged on the knife board seat, and the other end of the baffle is provided with a rotatable extrusion roller.
The invention is further provided with: and the baffle is also provided with a scraping strip which is contacted with the first squeeze roller.
The invention is further provided with: the scraper II is provided with a rotatable scraper III, the rotatable scraper III is positioned on the side of a space clamped between the scraper II and the scraper I, one end of an elastic rod II is hinged to the scraper III, and the other end of the elastic rod II is hinged to the scraper II.
The invention is further provided with: and a seepage port is also formed in the second scraper.
The invention is further provided with: the ink cleaning cotton belt comprises:
the first conveying roller is of a square arrangement structure, and a second conveying roller is arranged on the outer side of the first conveying roller at the lower right corner of the lower right end;
the cleaning cotton belt is sleeved outside the first conveying roller and the second conveying roller, a pattern frame opening corresponding to the pattern on the surface of the plate roller is formed in the cleaning cotton belt, a retention pad is filled and sealed in the frame bottom of the pattern frame opening, and a rigid strip frame corresponding to the pattern represented by the plate roller is fixed on the retention pad;
the cotton belt cleaning assembly is arranged on the left side surface and the lower side surface area of the cleaning cotton belt in a surrounding mode and is used for cleaning ink adsorbed outside the cleaning cotton belt.
The invention is further provided with: the cleaning cotton belts are configured into a multi-layer cleaning cotton net belt superposition structure, and the mesh pore diameters of the cleaning cotton net belts from the outer layer to the inner layer are sequentially reduced.
The invention is further provided with: the cotton belt cleaning assembly comprises:
the L-shaped box cover is arranged on the left side surface and the lower side surface of the outer side of the cleaning cotton belt in a surrounding mode, a plurality of flushing pipes which are arranged in a plane are arranged in the L-shaped box cover positioned on the lower side surface, the flushing pipes are provided with jet holes pointing to the direction of the cleaning cotton belt, the flushing pipes are mutually communicated through communicating pipes, one of the communicating pipes is communicated with an ingress pipe for guiding high-pressure cleaning liquid, the lower end of the L-shaped box cover is communicated with a liquid discharge pipe, and the upper end of the L-shaped box cover is communicated with an exhaust pipe;
the second extrusion roller is arranged on the opposite side of the first conveying roller at the lower left and extrudes the cleaning cotton outside the belt;
the high-pressure air flow impact cover is configured into two groups and is respectively covered on the left side face and the lower side face of the inner side of the cleaning cotton belt, the high-pressure air flow impact cover comprises an outer cover shell which is covered on the belt face of the cleaning cotton belt and is communicated with the high-pressure compressor, a first laminating roller which is contacted with the cleaning cotton belt is respectively arranged at the left edge opening and the right edge opening of the lower end of the outer cover shell, and an S-shaped heating ring is further arranged in the outer cover shell which is positioned on the left side face.
The invention is further provided with: and a second laminating roller for assisting in fixing the cleaning cotton belt is respectively laminated on the upper and lower belt surfaces of the cleaning cotton belt along the part of the covering region of the shell.
Compared with the prior art, the invention provides an automatic packaging film surface pattern printing device, which has the following beneficial effects:
according to the invention, the excessive ink on the roller surface of the plate roller is scraped primarily through the ink scraping system, and then a small amount of thin ink on the roller surface of the plate roller is scraped secondarily through the ink cleaning cotton belt, so that the ink except the pattern sticking on the roller surface of the plate roller is removed fully, wherein the pattern sticking ink on the roller surface of the plate roller is enabled to be more full and uniform through the structural design of the ink scraper, the ink is taken out more efficiently and the removing effect is better through the matching of the designed ink cleaning cotton belt, the scraping damage on the roller surface of the plate roller is greatly lower, and the quality of the pattern sticking ink on the roller surface of the plate roller and the printing quality of a packaging film are improved.
Drawings
FIG. 1 is a schematic diagram of an automated packaging film surface pattern printing apparatus according to the present invention;
FIG. 2 is a schematic diagram of an ink doctoring system according to the present invention;
FIG. 3 is a schematic view of the ink doctor blade of the invention;
FIG. 4 is a schematic view of a cleaning cotton belt part structure of the present invention;
in the figure: 1. installing a plate frame; 2. an ink tank; 3. a plate roller; 4. a film winding roller; 5. an ink doctoring system; 6. an ink scraper; 7. ink cleaning cotton belt; 8. a cotton belt cleaning assembly; 61. a knife board seat; 62. a first scraper; 63. a second scraper; 64. an elastic rod I; 65. a telescopic rod; 66. a scraper III; 67. a second elastic rod; 621. a baffle; 622. a first squeeze roll; 623. scraping the strip; 631. a seepage port; 71. a first conveying roller; 72. a second conveying roller; 73. cleaning cotton belts; 74. a pattern frame opening; 75. a retention pad; 76. a rigid bar frame; 81. an L-shaped box cover; 82. a flushing pipe; 83. a communicating pipe; 84. an ingress pipe; 85. a liquid discharge pipe; 86. a second squeeze roll; 87. the high pressure air stream impinges the shroud; 821. jet holes; 871. a high pressure compressor; 872. an outer housing; 873. a first laminating roller; 874. a second laminating roller; 875. an S-shaped heating ring; 876. and (5) an exhaust pipe.
Detailed Description
Referring to fig. 1-4, the present invention provides a technical solution: an automated packaging film surface pattern printing apparatus, comprising: the printing ink box comprises a mounting plate frame 1, wherein an ink box 2 is arranged at the bottom of the mounting plate frame, a plate roller 3 is arranged above the ink box 2, and a film winding roller 4 is arranged above the plate roller 3; an ink scraper 6, which is arranged on one side of the plate roller 3 at the input side of the film winding roller 4 and is used for carrying out primary scraping treatment on the ink on the roller surface of the plate roller 3; an ink cleaning cotton belt 7 which is arranged on one side of the plate roller 3 between the ink scraper 6 and the input side of the film winding roller 4 and is used for carrying out secondary scraping treatment on the ink on the roller surface of the plate roller 3; in this embodiment, after the printing roller rotates and is coated with the ink, the excessive ink on the roller surface of the printing roller is firstly scraped by the ink scraper after the adjustment is completed, and then the small amount of thin ink on the roller surface of the printing roller is wiped by the ink cleaning cotton belt to be scraped for a second time, so that the ink except for the pattern coating on the roller surface of the printing roller is fully removed.
Wherein the ink blade 6 includes: the upper and lower sides of one side end surface of the knife board seat 61 are respectively provided with a rotatable first knife 62 and a rotatable second knife 63; one end of the elastic rod I64 is hinged with the upper side surface of the knife board seat 61, and the other end of the elastic rod I is hinged with the scraper I62 and is used for elastically propping against the scraper I62 to contact the roller surface of the plate roller 3; one end of the telescopic rod 65 is hinged with the lower side surface of the knife board seat 61, and the other end of the telescopic rod is hinged with the second scraper 63 for regulating and controlling the interval distance between the second scraper 63 and the roller surface of the plate roller 3; the first scraper 62 comprises a baffle 621, one end of which is hinged on the knife board seat 61, and the other end of which is provided with a rotatable first squeeze roller 622; the second scraper 63 is provided with a third rotatable scraper 66 which is positioned at the space side clamped between the second scraper 63 and the first scraper 62, one end of a second elastic rod 67 is hinged to the third scraper 66, and the other end of the second elastic rod 67 is hinged to the second scraper 63; and a seepage port 631 is also arranged on the second scraper 63; specifically, the ink scraping knife debugging process comprises the following steps: the method comprises the following steps: regulating the inclination angles and the inclination positions of a second scraper and a third scraper by regulating the telescopic distances of a telescopic rod, regulating the inclination angle main body direction of the second scraper to form a top scraping trend, carrying out main top scraping and removing on the ink, regulating the inclination angle main body direction of the third scraper to form a pressing scraping trend, assisting and carrying out auxiliary pressing scraping and removing on the ink again, namely, regulating the top pressing contact strength of the third contact of the second scraper to the ink roller surface by regulating the elastic force of the elastic rod to control the flow rate of the ink flow of the pattern on the ink roller surface except the ink flow layer of the first scraper by regulating the top pressing contact strength of the third contact of the elastic rod to the ink roller surface, wherein the ink layer is formed by accumulating in the clamped area of the second scraper; and two,: the pressing strength of the elastic rod I for elastically pushing the extrusion roller I and the roller surface of the plate roller is high, so that the ink layer on the roller surface of the plate roller is thinned and becomes uniform again in a rolling mode, and the roller surface of the plate roller is not scratched and damaged; and thirdly,: the whole range of the action area of the first scraper, the second scraper and the third scraper on the roller surface of the plate roller is required to be debugged;
wherein, the baffle 621 is further provided with a scraping bar 623 contacting the first squeeze roller 622 for separating and scraping the ink centrifugally driven by the roller surface of the first squeeze roller.
Wherein the ink cleaning cotton tape 7 comprises: the first conveying roller 71 is in a square arrangement structure, and a second conveying roller 72 is arranged on the outer side of the first conveying roller 71 at the lower right end corner; the cleaning cotton belt 73 is sleeved outside the first conveying roller 71 and the second conveying roller 72, a pattern frame opening 74 corresponding to the surface pattern of the plate roller 3 is formed in the cleaning cotton belt 73, a retention pad 75 is filled and sealed in the frame bottom of the pattern frame opening 74, and a rigid strip frame 76 corresponding to the pattern of the plate roller is fixed on the retention pad 75, so that the pattern ink of the surface of the plate roller can be effectively protected when an ink layer except the pattern ink of the surface of the plate roller is wiped; and the cotton belt cleaning assembly 8 is arranged around the left side surface and the lower side surface area of the cleaning cotton belt 73 and is used for cleaning the ink adsorbed on the outer surface of the cleaning cotton belt 73.
Wherein, the cleaning cotton belt 73 is configured into a multi-layer cleaning cotton net belt superposition structure, and the mesh aperture of the cleaning cotton net belt from the outer layer to the inner layer is sequentially reduced, which is favorable for tending to the side seepage of the inner layer of the cleaning cotton belt of the ink box, and is also favorable for the efficiency of the gas outflow penetrating the cleaning cotton belt to drive the ink to flow out.
Wherein, the cotton belt cleaning assembly 8 comprises: the L-shaped box cover 81 is arranged on the left side surface and the lower side surface of the outer side of the cleaning cotton belt 73 in a surrounding manner, a plurality of flush pipes 82 which are arranged in a plane are arranged in the L-shaped box cover 81 positioned on the lower side surface, the flush pipes 82 are provided with jet holes 821 pointing to the direction of the cleaning cotton belt 73, the flush pipes 82 are mutually communicated through a communicating pipe 83, one of the communicating pipes 83 is communicated with an ingress pipe 84 for leading in high-pressure cleaning liquid, the lower end of the L-shaped box cover 81 is communicated with a liquid discharge pipe 85, and the upper end of the L-shaped box cover 81 is communicated with an exhaust pipe 876; a second squeeze roller 86 disposed on the opposite side of the first conveyor roller 71 and squeezing the cleaning cotton belt 73; the high-pressure air flow impact covers 87 are arranged into two groups and respectively cover the left side surface and the lower side surface of the inner side of the cleaning cotton belt 73, the high-pressure air flow impact covers 87 comprise cover shells 872 which are arranged on the belt surface of the cleaning cotton belt 73 and are communicated with the high-pressure compressor 871, the left edge opening and the right edge opening at the lower end of the cover shells 872 are respectively provided with a laminating roller 873 which is contacted with the cleaning cotton belt 73, and the cover shells 872 positioned at the left side surface are also provided with S-shaped heating rings 875; that is, after the ink scraping treatment of the ink scraper, a thinner ink layer is left on the roller surface except the pattern ink on the roller surface of the plate roller, at the moment, the ink layer except the pattern ink on the roller surface of the plate roller is wiped and adsorbed and removed by the cleaning cotton belt which is conveyed, the adsorbed ink is timely and rapidly treated by the flushing pipe, the cleaning cotton belt is penetrated by the gas impact of the high-pressure air flow impact cover, the ink is favorably removed on the cleaning cotton belt which is more rapidly filled, and the cleaning cotton belt is rapidly dried by the heating gas on the left side surface, so that the cleaning cotton belt has a higher ink treatment effect again.
Wherein, the upper and lower belt surfaces of the cleaning cotton belt 73 are respectively adhered with a second adhering roller 874 for assisting in fixing the cleaning cotton belt 73 along the covering region of the housing 872, which is beneficial to maintaining the cleaning cotton belt in a flat and solid state.
In specific implementation, the method comprises the following steps:
s1: after the ink is debugged, the ink scraper is debugged by factors such as ink viscosity;
s2: debugging the transmission speed of a cleaning cotton belt in the ink cleaning cotton belt;
s3: the pattern printing can be performed on the packaging film by starting the cotton belt cleaning component, the plate roller, the film winding roller, the cleaning cotton belt and the like.
The above description is only of the preferred embodiments of the invention, but the protection scope of the invention is not limited thereto, and any person skilled in the art who is skilled in the art to which the invention pertains should make equivalent substitutions or modifications according to the technical solution of the invention and its inventive concept within the scope of the invention.

Claims (10)

1. An automated packaging film surface pattern printing device, comprising:
the printing ink box comprises a mounting plate frame (1), wherein an ink box (2) is arranged at the bottom of the mounting plate frame, a plate roller (3) is arranged above the ink box (2), and a film winding roller (4) is arranged above the plate roller (3);
the ink scraper (6) is arranged on one side of the plate roller (3) at the input side of the film winding roller (4) and is used for carrying out primary scraping treatment on the ink on the roller surface of the plate roller (3);
and the printing ink cleaning cotton belt (7) is arranged on one side of the plate roller (3) between the printing ink scraper (6) and the input side of the film winding roller (4) and is used for carrying out secondary scraping treatment on printing ink on the roller surface of the plate roller (3).
2. An automated packaging film surface pattern printing device according to claim 1, wherein the ink doctor blade (6) comprises:
the upper side and the lower side of one side end surface of the knife board seat (61) are respectively provided with a rotatable first scraper (62) and a rotatable second scraper (63);
one end of the elastic rod I (64) is hinged with the upper side surface of the knife board seat (61), and the other end of the elastic rod I is hinged with the scraper I (62) and is used for elastically pushing the scraper I (62) to contact the roller surface of the plate roller (3);
and one end of the telescopic rod (65) is hinged with the lower side surface of the knife board seat (61), and the other end of the telescopic rod is hinged with the second scraper (63) for regulating and controlling the interval distance between the second scraper (63) and the roller surface of the plate roller (3).
3. An automated packaging film surface pattern printing apparatus according to claim 2, wherein the first doctor blade (62) comprises a baffle plate (621) hinged at one end to the blade holder (61) and mounted at the other end with a rotatable first squeeze roll (622).
4. An automated packaging film surface pattern printing apparatus according to claim 3, wherein the baffle (621) is further provided with a wiper strip (623) in contact with the first squeeze roll (622).
5. An automated packaging film surface pattern printing apparatus according to claim 2, wherein a third rotatable scraper (66) is mounted on the second scraper (63) and is located on a side of a space sandwiched between the second scraper (63) and the first scraper (62), and one end of a second elastic rod (67) is hinged to the third scraper (66) and the other end of the second elastic rod (67) is hinged to the second scraper (63).
6. The automated packaging film surface pattern printing device according to claim 5, wherein the second scraper (63) is further provided with a seepage port (631).
7. An automated packaging film surface pattern printing device according to claim 1, wherein the ink cleaning cotton tape (7) comprises:
the first conveying roller (71) is of a square arrangement structure, and a second conveying roller (72) is arranged on the outer side of the first conveying roller (71) positioned at the lower right end corner;
the cleaning cotton belt (73) is sleeved outside the first conveying roller (71) and the second conveying roller (72), a pattern frame opening (74) corresponding to the surface pattern of the plate roller (3) is formed in the cleaning cotton belt (73), a retention pad (75) is filled and sealed in the frame bottom of the pattern frame opening (74), and a rigid strip frame (76) corresponding to the plate roller expression pattern is fixed on the retention pad (75);
and the cotton belt cleaning assembly (8) is arranged in the left side surface and the lower side surface area of the cleaning cotton belt (73) in a surrounding mode and is used for cleaning ink adsorbed on the outer surface of the cleaning cotton belt (73).
8. An automated packaging film surface pattern printing apparatus according to claim 7, wherein the cleaning cotton tape (73) is configured as a multi-layered cleaning cotton net tape stack structure, and mesh apertures of the cleaning cotton net tape from the outer layer to the inner layer are sequentially reduced.
9. An automated packaging film surface pattern printing apparatus according to claim 7, wherein said cotton tape cleaning assembly (8) comprises:
the cleaning device comprises an L-shaped box cover (81), a plurality of flushing pipes (82) which are arranged in a plane are distributed in the L-shaped box cover (81) positioned on the lower side, the flushing pipes (82) are provided with jet holes (821) which are directed towards the cleaning cotton belt (73), the flushing pipes (82) are mutually communicated through communicating pipes (83), one of the communicating pipes (83) is communicated with an ingress pipe (84) for leading in high-pressure cleaning liquid, the lower end of the L-shaped box cover (81) is communicated with a liquid discharge pipe (85), and the upper end of the L-shaped box cover (81) is communicated with an exhaust pipe (876);
a second squeeze roller (86) disposed on the opposite side of the first conveyor roller (71) and squeezing the outer side of the cleaning cotton belt (73);
the high-pressure air flow impact cover (87) is configured into two groups, and is respectively arranged on the left side surface and the lower side surface of the inner side of the cleaning cotton belt (73), the high-pressure air flow impact cover (87) comprises a housing shell (872) which is arranged on the belt surface of the cleaning cotton belt (73) and communicated with a high-pressure compressor (871), a first laminating roller (873) which is in contact with the cleaning cotton belt (73) is respectively arranged at the left edge and the right edge of the lower end of the housing shell (872), and an S-shaped heating ring (875) is further arranged in the housing shell (872) which is arranged on the left side surface.
10. The automated packaging film surface pattern printing apparatus of claim 9, wherein two laminating rollers (874) for assisting in fixing the cleaning cotton tape (73) are respectively laminated on the upper and lower tape surfaces of the cleaning cotton tape (73) along a part of the housing region of the housing (872).
CN202310474617.6A 2023-04-28 2023-04-28 Automatic change packaging film surface pattern printing device Pending CN116330816A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310474617.6A CN116330816A (en) 2023-04-28 2023-04-28 Automatic change packaging film surface pattern printing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310474617.6A CN116330816A (en) 2023-04-28 2023-04-28 Automatic change packaging film surface pattern printing device

Publications (1)

Publication Number Publication Date
CN116330816A true CN116330816A (en) 2023-06-27

Family

ID=86878905

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310474617.6A Pending CN116330816A (en) 2023-04-28 2023-04-28 Automatic change packaging film surface pattern printing device

Country Status (1)

Country Link
CN (1) CN116330816A (en)

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