# US 2025/0375970 A1 · Method for operating a printing apparatus, printing apparatus and software product

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- Number: US 2025/0375970 A1
- Document ID: US20250375970A1
- Status: Published application
- Kind: A1
- Application number: 19/299,720
- Filed: 2025-08-14
- Published: 2025-12-11
- Earliest claimed: 2023-02-22
- Assignees: Canon Production Printing Holding B.V.
- Applicants: Canon Production Printing Holding B.V.
- Inventors: Takahiro P. TERAYAMA; Thijs W. VERSLOOT; Matheus WIJNSTEKERS; Maikel A.J. HUYGENS
- Web page: https://patentgrep.com/patent/US20250375970A1

## CPC

- B41J 11/00212: {Controlling the irradiation means, e.g. image-based controlling of the irradiation zone or control of the duration or intensity of the irradiation}
- B41J 11/00214: {using UV radiation}
- B41M 7/0081: {using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams}
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)

## Abstract

The present invention relates to a method for applying an image onto a receiving medium, wherein the image is applied onto the recording medium by depositing a UV-curable ink and the ink is irradiated with radiation, wherein the radiation comprises two types of UV radiation. The present invention further relates to a printing apparatus and a software product.

## Claims

### Claim 1

Method for applying an image onto a receiving medium, the method comprising the steps of:
a) Applying a predetermined pattern of a UV-curable ink onto a recording medium to form an image;
b) irradiating the UV-curable ink with UV radiation; the UV radiation comprising at least two types of UV radiation, the first type of UV-radiation having a first wavelength and the second type of UV-radiation having a second wavelength, the first wavelength being shorter than the second wavelength
wherein in step b,
the ink is first irradiated with a first intensity of the first type of radiation and a second intensity of the second type of radiation, wherein the first intensity is greater than the second intensity.

### Claim 2 (depends on 1)

Method according to claim 1, wherein secondly, the ink is irradiated with a third intensity of the first type of radiation and a fourth intensity of the second type of radiation, wherein the fourth intensity is greater than the third intensity.

### Claim 3 (depends on 1)

Method according to claim 1, wherein at the start of the irradiation, the intensity of the first type of radiation is increased at a first rate and the intensity of the second type of radiation is increased at a second rate, wherein the first rate is at least three times higher than the second rate.

### Claim 4 (depends on 1)

Method according to claim 1, wherein at the start of the irradiation, the intensity of the second type of radiation is zero.

### Claim 5 (depends on 1)

Method according to claim 1, wherein the UV-curable ink is a gelling UV-curable ink.

### Claim 6 (depends on 1)

Method according to claim 1, wherein the second wavelength is in the range of 375 nm to 415 nm.

### Claim 7 (depends on 6)

Method according to claim 6, wherein the first wavelength is in the range of 100 nm to 315 nm.

### Claim 8 (depends on 6)

Method according to claim 6, wherein the first wavelength is in the range of 350 nm to 395 nm.

### Claim 9 (depends on 8)

Method according to claim 8, wherein the difference between the first wavelength and the second wavelength is from 5 nm to 50 nm.

### Claim 10 (depends on 5)

Method according to claim 5, wherein in step a), the predetermined pattern comprises a plurality of ink layers.

### Claim 11 (depends on 1)

Printing apparatus comprising:
at least one print unit for depositing a UV-curable ink;
a curing unit;
a recording medium support for supporting a recording medium;
a control unit configured to in operation control the printing apparatus to perform a method according claim 1.

### Claim 12 (depends on 1)

A software product comprising program code on a non-transitory machine-readable medium, wherein the program code, when loaded into a controller of a printing apparatus with at least one printing unit for depositing a UV-curable ink, a curing unit and a control unit, causes the controller to perform a method according to claim 1.