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CN-121973447-A - Direct-writing printing method with controllable film forming thickness for ink with spreading behavior

CN121973447ACN 121973447 ACN121973447 ACN 121973447ACN-121973447-A

Abstract

The invention discloses a direct-writing printing method with controllable film forming thickness for ink with spreading behavior, which comprises the steps of (1) determining the target thickness of a fiber to be printed, (2) constructing a multi-fiber fusion geometric model for predicting the thickness of an integral film layer after fiber fusion, and determining the target value range of a control parameter corresponding to the target thickness, wherein the control parameter comprises a multi-fiber arrangement parameter and a printing parameter, the multi-fiber arrangement parameter is the ratio of the center distance between adjacent fibers to the width after spreading, (3) determining the target printing parameter according to the target value range of the control parameter, and (4) printing on a printing substrate according to the target printing parameter and the multi-fiber arrangement parameter to form the fiber with the target thickness. The invention can be suitable for different material systems and different structural design requirements, and realizes accurate prediction, regulation and control and reverse design of the thickness of the film.

Inventors

  • YAO XINHUA
  • MA YUZHE
  • TIAN LIXIN
  • CHEN YU
  • LUAN CONGCONG

Assignees

  • 浙江大学

Dates

Publication Date
20260505
Application Date
20260119

Claims (8)

  1. 1. A direct-write printing method with controllable film thickness for ink having spreading behavior, characterized by comprising the steps of: (1) Determining a target thickness of the fiber to be printed; (2) Constructing a multi-fiber fusion geometric model for predicting the thickness of the integrated film layer after fiber fusion, and determining a target value range of a control parameter corresponding to the target thickness; wherein the control parameters comprise a multi-fiber arrangement parameter and a printing parameter, and the multi-fiber arrangement parameter is the center distance between adjacent fibers Width of fibre just deposited on the platform Is a ratio of (2); (3) Determining a target printing parameter according to a target value range of the control parameter; (4) And printing on the printing substrate according to the target printing parameters and the multi-fiber arrangement parameters to form fibers with target thickness.
  2. 2. The direct-writing printing method with controllable film thickness for ink having spreading behavior according to claim 1, wherein the specific process of step (2) is: (2-1) obtaining the section parameters of the individual fibers corresponding to the printing parameters based on the experimentally measured data and the width of the fibers just deposited on the stage The cross-section parameters include effective width Height of And cross-sectional area ; (2-2) Based on the center distance between adjacent fibers Cross-sectional parameters of individual fibers and width of the fibers as they are deposited on the platform Constructing a multi-fiber fusion geometric model for predicting the thickness of the film layer after fiber fusion; (2-3) inputting the experimental data in the step (2-1) into a multi-fiber fusion geometric model to obtain a corresponding fiber fusion membrane thickness range table under the printing parameter permission condition; (2-4) center distance between adjacent fibers Width of fibre just deposited on the platform And determining a target value range of the control parameter corresponding to the target thickness characteristic according to the table by taking the multi-fiber arrangement parameter and the printing parameter as the control parameters.
  3. 3. The direct-write printing method according to claim 2, wherein in the step (2-1), the printing parameters include a print nozzle specification, a print temperature, a print height, a print speed, a print air pressure.
  4. 4. The direct-writing printing method with controllable film thickness for ink having spreading behavior according to claim 2, wherein in step (2-2), the center-to-center distance between adjacent fibers Width of fibre just deposited on the platform And (3) determining the fusion degree of the fibers, and calculating the thickness of the film after the fibers are fused by adopting a contour principle, an equal area principle or a section energy minimum principle.
  5. 5. The method of direct-write printing with controllable film thickness for ink having spreading behavior according to claim 2, wherein in step (2-2), the multi-fiber fusion geometric model predicts the thickness of the post-fiber fusion film layer by the following formula: ; Wherein, the For the total width of the fiber after fusion and curing, For the width of the fiber just deposited onto the platform, As the contact angle of the fiber as it is just deposited onto the platen, Is the contact angle of the fused and solidified fiber.
  6. 6. The method of direct-write printing with controllable film thickness for ink having spreading behavior according to claim 5, wherein the total film thickness after multi-layer lamination is obtained by cumulative summation of film thicknesses after fusion of the layers of fibers, taking into account the effects of cross-layer fiber misalignment.
  7. 7. The method of direct-write printing with controllable film formation thickness for ink having spreading behavior according to claim 2, wherein in step (2-4), the target thickness characteristic is divided into uniformity and non-uniformity, wherein the non-uniformity thickness characteristic includes a thickness gradient and a thickness step change.
  8. 8. The method of direct-write printing with controllable film thickness for ink having spreading behavior according to claim 1, wherein the fiber to be printed is silicone rubber, hydrogel, photo-curable resin, polyurethane or liquid metal composite.

Description

Direct-writing printing method with controllable film forming thickness for ink with spreading behavior Technical Field The invention relates to the technical field of soft material additive manufacturing and fiber direct-writing printing, in particular to a direct-writing printing method with controllable film forming thickness for ink with spreading behavior. Background Direct write printing (DIRECT INK WRITING, DIW) is widely used in flexible device, shape programmable structure and biomedical interface fabrication because it is suitable for multiple types of soft material systems including silicone rubber, hydrogels, photo-curable resins, liquid metal composites, etc. For example, chinese patent document with publication number CN111370217A discloses a method for preparing permanent magnets by photocuring assisted direct-writing 3D printing, and Chinese patent document with publication number CN120326929A discloses a water-soluble core mold material based on direct-writing forming photocuring 3D printing and a preparation method thereof. During the soft material DIW, the material is typically deposited in a fibrous, lane-by-lane fashion and forms a continuous film or multilayer structure by partial or complete fusion between the fibers. However, the prior art fiber film thickness has the following disadvantages: 1. Thickness is difficult to predict Film thickness is commonly affected by nozzle diameter, extrusion speed, print path spacing, fiber spread, and multi-fiber fusion behavior, and the existing technology generally depends on empirical tuning and lacks a unified prediction method. 2. Lack of multi-fiber fusion model The fibers are spread laterally to different degrees after deposition, the fusion morphology between adjacent fibers also varies with the path spacing and the fiber width, and the prior art lacks a general model capable of describing the cross-sectional geometry change after multi-fiber fusion. 3. The film thickness is not designed Due to the lack of a quantitative model of the fusion geometry, the printing parameters cannot be calculated in a theoretical reverse direction to obtain the target film thickness, resulting in limitations in high-precision film manufacturing. Therefore, there is a need for a general method for predicting film thickness by a multi-fiber fusion geometric model based on measurable or known single fiber cross-section information, thereby achieving predictable, controllable and designable film formation processes. Disclosure of Invention The invention provides a direct-writing printing method with controllable film thickness aiming at ink with spreading behavior, which does not depend on a single fiber spreading dynamics model, can be suitable for different material systems and different structural design requirements, and realizes accurate prediction, regulation and control and reverse design of film thickness. A direct-write printing method with controllable film thickness for ink having spreading behavior, comprising the steps of: (1) Determining a target thickness of the fiber to be printed; (2) Constructing a multi-fiber fusion geometric model for predicting the thickness of the integrated film layer after fiber fusion, and determining a target value range of a control parameter corresponding to the target thickness; wherein the control parameters comprise a multi-fiber arrangement parameter and a printing parameter, and the multi-fiber arrangement parameter is the center distance between adjacent fibers Width of fibre just deposited on the platformIs a ratio of (2); (3) Determining a target printing parameter according to a target value range of the control parameter; (4) And printing on the printing substrate according to the target printing parameters and the multi-fiber arrangement parameters to form fibers with target thickness. The specific process of the step (2) is as follows: (2-1) obtaining the section parameters of the individual fibers corresponding to the printing parameters based on the experimentally measured data and the width of the fibers just deposited on the stage The cross-section parameters include effective widthHeight ofAnd cross-sectional area; (2-2) Based on the center distance between adjacent fibersCross-sectional parameters of individual fibers and width of the fibers as they are deposited on the platformConstructing a multi-fiber fusion geometric model for predicting the thickness of the film layer after fiber fusion; (2-3) inputting the experimental data in the step (2-1) into a multi-fiber fusion geometric model to obtain a corresponding fiber fusion membrane thickness range table under the printing parameter permission condition; (2-4) center distance between adjacent fibers Width of fibre just deposited on the platformAnd determining a target value range of the control parameter corresponding to the target thickness characteristic according to the table by taking the multi-fiber arrangement parameter and the printing para