CN-122008713-A - Pad printing method and system of pupil-beautifying VU printing printer

CN122008713ACN 122008713 ACN122008713 ACN 122008713ACN-122008713-A

Abstract

The invention provides a pad printing method and a pad printing system of a pupil VU printing printer, wherein the method comprises the steps of cleaning a flat steel plate, directly printing patterns matched with a pupil to-be-printed area on the surface of the steel plate in an ink-jet mode, identifying the center position of the ink-jet patterns through an optical focusing device, locking coordinates, controlling a rubber head to adsorb ink, transferring the ink to the pupil surface, and finally carrying out surface curing treatment on the pupil. The system comprises a plurality of functional modules which cooperatively execute the method. According to the invention, an ink-jet mode is adopted to replace the traditional laser engraving processing steel plate, accurate positioning is realized through optical focusing, various patterns of the pupil are adapted to pad printing, and the technical control of the whole pad printing process is perfected.

Inventors

HUANG GUYUAN
YI YUNSONG
XU JIWEI

Assignees

立晶精密科技(浙江)有限公司

Dates

Publication Date: 20260512
Application Date: 20260304

Claims (8)

1. A pad printing method of a pupil-beautifying VU printing printer, comprising the steps of: S1, preparing a flat steel plate and cleaning the surface of the flat steel plate; s2, directly printing patterns on the surface of the flat steel plate in an ink-jet mode to form ink-jet patterns matched with the to-be-printed areas of the pupil; S3, focusing and positioning the ink-jet patterns on the surface of the steel plate through an optical focusing device, identifying the center positions of the ink-jet patterns and locking coordinates; S4, controlling the rubber head to move above the locked central position, and adjusting the distance between the rubber head and the surface of the steel plate to enable the rubber head to be completely attached to the ink-jet pattern and absorb ink in the pattern; S5, moving the rubber head adsorbed with the ink to a designated position of a pupil to be pad printed, adjusting the pressure and the contact time of the rubber head, and transferring the ink to the surface of the pupil; s6, carrying out surface curing treatment on the transferred pupil to finish pupil transfer printing operation.
2. The pad printing method of the pupil VU printing printer of claim 1, wherein in the step S2, patterns are directly printed on the surface of the flat steel plate by adopting an ink jet mode, specifically, the method comprises the steps of adopting a UV ink jet mode, selecting UV ink special for pupil pad printing, precisely spraying the UV ink onto the surface of the flat steel plate according to a preset pattern track and fixed spraying pressure through an ink jet nozzle, controlling the diameters of ink jet drops to be consistent, forming ink jet patterns with uniform thickness and regular edges, controlling the thickness of the patterns within a preset range, and ensuring the matching with the adsorption characteristics of rubber heads.
3. The pad printing method of the pupil VU printing printer according to claim 1, wherein in the step S3, the ink-jet patterns on the surface of the steel plate are focused and positioned through the optical focusing device, and the method is characterized in that the optical focusing device emits high-frequency detection light, the light vertically irradiates the ink-jet pattern area on the surface of the steel plate, receives the light reflected by the patterns and carries out high-definition imaging, the contour extraction and the center point calculation are carried out on an imaging picture through an image recognition algorithm, the center position of the ink-jet patterns is accurately recognized, and meanwhile, the X-axis coordinate parameters and the Y-axis coordinate parameters of the center position are locked and transmitted to the control unit.
4. The pad printing method of the pupil VU printing printer of claim 1, wherein in the step S4, the distance between the rubber head and the surface of the steel plate is adjusted, and the specific steps are that after the control unit receives the coordinate parameters transmitted by the optical focusing positioning module, the rubber head is driven to move along the Z-axis direction, the distance between the rubber head and the surface of the steel plate is adjusted to a preset fixed value according to the preset thickness parameters of the ink-jet pattern, the distance between the rubber head and the steel plate is detected in real time in the adjustment process, the rubber head is ensured to be completely attached to the ink-jet pattern, the pattern structure is not extruded or damaged, and the ink absorption integrity is ensured.
5. The pad printing method of the beauty pupil VU printing printer according to claim 1, wherein in the step S6, the surface curing treatment is carried out on the beauty pupil after transfer, and the specific steps are that the transfer of the beauty pupil to a curing station, the directional irradiation is carried out on the ink on the surface of the beauty pupil by adopting a UV curing lamp, the irradiation power, the irradiation distance and the irradiation time of the UV curing lamp are controlled, the ink is rapidly cured and molded, the position of the beauty pupil is kept fixed in the curing process, sagging and halation phenomena of the ink are avoided, and the tight combination of the ink and the surface of the beauty pupil after curing is ensured, and the ink does not fall off and fade.
6. A pad printing method of a pupil VU printing printer as claimed in claim 1, wherein in the step S1, a flat steel plate is prepared and the surface of the flat steel plate is cleaned, and the specific steps are that a steel plate with the surface flatness meeting a preset standard is selected, a dust-free wiping cloth is adopted to dip a special cleaning reagent, the surface of the steel plate is wiped along the same direction, dust, greasy dirt and impurities on the surface are removed, the steel plate is sent to a drying station, the drying treatment is carried out through constant-temperature hot air, the dryness of the surface of the steel plate is detected after the drying, and the surface of the steel plate is ensured to be dry, free of residues of the cleaning reagent, free of scratches and free of stains.
7. The pad printing method of the pupil VU printing printer of claim 1, wherein in the step S4, the rubber head is controlled to move above the locked central position, and the specific steps are that the servo driving mechanism drives the rubber head to move, the servo driving mechanism receives the coordinate parameters transmitted by the control unit, the rubber head is accurately controlled to move along the X axis and the Y axis, the position of the rubber head is calibrated in real time in the moving process, the accurate alignment of the center of the rubber head and the center of the ink-jet pattern is ensured, the alignment error is controlled within a preset range, and the accuracy of the subsequent ink absorption and transfer is ensured.
8. A pad printing system of a beauty pupil VU printing printer is used for implementing the method of any one of claims 1 to 7 and is characterized by comprising a steel plate pretreatment module, an ink jet printing module, an optical focusing positioning module, a rubber head transfer module, a beauty pupil positioning module, a curing treatment module and a control system module, wherein the steel plate pretreatment module comprises a cleaning unit and a drying unit, the cleaning unit is used for wiping and cleaning a flat steel plate, the drying unit is used for carrying out constant-temperature drying on the cleaned steel plate, the ink jet printing module comprises a UV ink jet nozzle, an ink supply unit and a mobile driving unit, and is used for carrying out ink jet printing on the surface of the steel plate according to preset parameters, the optical focusing positioning module comprises a light emitting unit, an imaging unit and a coordinate calculating unit, and is used for completing focusing, center recognition and coordinate locking of the ink jet patterns, the rubber head transfer printing module comprises a rubber head, a servo driving unit and a pressure adjusting unit, and is used for adsorbing ink and completing transfer printing to the beauty pupil, the beauty pupil positioning module is used for fixing the pupil to be transferred and accurately positioning the area to be printed, the curing treatment module comprises a UV curing lamp and a station transfer unit, and is used for carrying out constant-temperature drying on the cleaned steel plate, the ink jet printing module is used for carrying out ink jet printing on the surface of the steel plate, and is used for respectively controlling and accurately printing control and sending and controlling the control signals and the full-pupil transfer control module to realize the full-pupil transfer control.

Description

Pad printing method and system of pupil-beautifying VU printing printer Technical Field The invention relates to the technical field of pupil processing, in particular to a pad printing method and a pad printing system of a pupil VU printing printer. Background In the process of producing the beautiful pupil, pad printing is a core process for realizing the pattern printing on the surface of the beautiful pupil, at present, the traditional pad printing process is generally adopted in the industry to print the pattern on the contact lens, the process needs to carry out laser engraving processing on a steel plate, a preset pattern groove is formed on the surface of the steel plate, then ink is filled into the pattern groove formed by laser engraving through an ink cup, finally, the rubber head is used for attaching the surface of the steel plate, the ink in the pattern groove is adsorbed and transferred to the surface of the beautiful pupil, and the beautiful pupil pad printing operation is completed. The core of the traditional process depends on the laser engraving processing precision of the steel plate, the flatness of the steel plate, the depth of laser engraving patterns and the contour regularity are required to be strictly controlled in order to ensure the subsequent ink adsorption and transfer printing effects, and particularly the position degree requirement of the laser engraving patterns is extremely high, and the precise correspondence of the pattern positions and the glue head and the pupil to-be-printed areas is required to be ensured. The traditional transfer printing process for the laser engraving steel plate has the defects that the laser engraving processing procedure of the steel plate is complex, special laser engraving equipment and professional operators are needed, the processing period is long, the processing cost of the steel plate is greatly increased, in the laser engraving process, the position degree and the contour precision of patterns are easily influenced by the equipment precision and the operation level, the patterns cannot be repaired after deviation occurs, only scrapped processing is needed, and the production cost is further increased. Meanwhile, for pad printing of complex patterns, the traditional laser engraving process is difficult to accurately show pattern details, the problems of fuzzy pattern edges, loss of details and the like are easy to occur, and the accurate positioning means are lacked, so that the alignment precision of a rubber head and laser engraving patterns is insufficient, the pad printing size is unstable, and the quality of a pupil product is affected. In addition, the links of the traditional process are connected by relying on manual control, so that the efficiency is low, the pad printing requirements of various patterns and pupils in mass production are difficult to adapt, and the production requirements of high efficiency, accuracy and low cost in industry cannot be met. Disclosure of Invention Aiming at the technical defects, the invention aims to provide a pad printing method and a pad printing system of a pupil VU printing printer, which are suitable for pad printing of various patterns of the pupil and perfect technical control of the whole pad printing process. In order to achieve the above purpose, the invention adopts the following technical scheme: A pad printing method of a pupil-beautifying VU printing printer, comprising the steps of: S1, preparing a flat steel plate and cleaning the surface of the flat steel plate; s2, directly printing patterns on the surface of the flat steel plate in an ink-jet mode to form ink-jet patterns matched with the to-be-printed areas of the pupil; S3, focusing and positioning the ink-jet patterns on the surface of the steel plate through an optical focusing device, identifying the center positions of the ink-jet patterns and locking coordinates; S4, controlling the rubber head to move above the locked central position, and adjusting the distance between the rubber head and the surface of the steel plate to enable the rubber head to be completely attached to the ink-jet pattern and absorb ink in the pattern; S5, moving the rubber head adsorbed with the ink to a designated position of a pupil to be pad printed, adjusting the pressure and the contact time of the rubber head, and transferring the ink to the surface of the pupil; s6, carrying out surface curing treatment on the transferred pupil to finish pupil transfer printing operation. Preferably, in the step S2, patterns are directly printed on the surface of the flat steel plate by adopting an ink jet mode, specifically, the method comprises the steps of adopting a UV ink jet mode, selecting UV ink special for pupil transfer printing, precisely jetting the UV ink to the surface of the flat steel plate according to a preset pattern track and fixed jet pressure through an ink jet nozzle, controlling the diameters of ink jet drops to be consistent, for