High-flux array type 3D liquid drop printing method

Abstract

The invention discloses a high-flux array type 3D liquid drop printing method. In order to solve the problems that when suspension liquid drops are prepared in a point-by-point printing manner, the printing rate is low, and time consumed by production is long, array type spray heads are adopted, and the printing rate of liquid drops can be effectively improved by increasing the number of array capillary needle heads; in the printing process, micro vibration is applied to the array type spray heads, the shearing effect between liquid drops and a hydrogel matrix can be actively regulated and controlled, the hydrogel matrix is kept not damaged, the array liquid drops are synchronously and uniformly extruded out, and high-flux stable printing of the suspension liquid drops is achieved; and by combining the arrangement spacing of array through holes of the spray heads and pattern design, the sizes and spatial positions of the liquid drops can be accurately controlled, optimal arrangement of the liquid drops is realized, the oil / water phase proportion is improved, and a three-dimensional model with a specific shape is prepared according to actual requirements. The method is simple and easy to implement, can be used for batch production, and has wide application prospects in the fields of foods, medicines, cosmetics and the like.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a high-throughput array-type 3D droplet printing method. Background technique [0002] 3D droplet printing is a new printing technology based on the combination of traditional fused deposition 3D printing and microfluidic liquid feeding mechanism. 3D droplet printing can obtain suspended droplets by printing liquid in a shear-thinning matrix, which has shown great potential in material design and product development. Taking cosmetics as an example, 3D printing suspended droplets can precisely control the size and spatial position of the droplets, which provides a broad space for product development and design. [0003] However, 3D printing of suspended liquid droplets faces an important problem, that is, the printing speed is too low. Printing a bottle of product can often take several hours, as each droplet requires the needle to move into place and then extrude the liquid...

AI Technical Summary

Problems solved by technology

[0004] However, in practice, side-by-side array printheads are not very good at printing droplets in a shear-thinning matrix

There are two main problems: one is that due to the certain viscosity of the hydrogel matrix, the side-by-side array printing nozzles will drive the matrix to move as a whole, destroying the spatial arrangement of the droplets.

The second is that when a single droplet is extruded, a local viscosity gradient will be generated around it. When the droplet array is extruded, a local environment that interferes with each other will be generated. It is difficult to ensure that all droplets fall off from the printing nozzle synchronously and have a uniform size.

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