Fused deposition type 3D printing method based on biopolymer prefabricated bar

A biopolymer, 3D printing technology, used in 3D object support structures, additive manufacturing, manufacturing tools, etc., can solve the problems of printing consumables that are easily oxidized by moisture, affect continuous and stable printing, and break molecular bonds, and avoid the strength of the bar. Degradation or thermal degradation of polymer materials, ensuring high-precision high-quality printing, avoiding pollution and waste

Pending Publication Date: 2017-10-10
REGENOVO BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production cost of wire is low and the processing performance is good, but its wire is easily softened and expanded by heat, which blocks the feed throat and affects continuous and stable printing; the prior art utility model patent (application number: 201620025599.9) discloses a fused deposition type 3D The cooling print nozzle of the printer, this design ensures the smooth advancement and melting extrusion of consumables, and improves the smoothness of printing
However, in the actual clinical application of FDM, there are still problems such as printing consumables are susceptible to moisture and oxidation, which will directly affect the quality and performance of molded parts. Problems such as material pollution and waste are still unresolved;

Method used

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  • Fused deposition type 3D printing method based on biopolymer prefabricated bar
  • Fused deposition type 3D printing method based on biopolymer prefabricated bar
  • Fused deposition type 3D printing method based on biopolymer prefabricated bar

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1-1:

[0040] 1) Take a certain amount of polylactide (PLA) particles and grind them with a pulverizer, and place them in a mortar for further grinding. Dry the ground materials in a vacuum dryer at room temperature for 24 hours and then use a 28-mesh sieve for sieving After processing, the obtained powder is ready for use.

[0041] 2) Take a unit volume of polylactide polymer material powder, measure its mass by an electronic balance to be 0.90g, and calculate the density of the powder to be 0.90g / cm 3 , According to the volume is 1.13cm 3 The mold calculates the mass of the sample to be 1.02g, and weighs a sample of the same mass with a balance.

[0042] 3) Put the weighed powder sample with sulfuric acid paper into a powder pressing mold with a diameter of 5mm, place the weighing mold with the sample powder on top of the hydraulic pressure, press 5Mpa and keep the pressure for 3 minutes until the pre-pressed sample becomes a cylindrical shape, and continue at a cons...

Example

[0044] Examples 1-2~1-4:

[0045] The molding pressure of step 3) in Example 1-1 was changed from 15Mpa to 10Mpa, 20Mpa, and 25Mpa, and the remaining experimental conditions were the same as those in Example 1-1, and the required preformed rod was finally prepared.

[0046] Table 1 The influence of forming pressure on the relative density of the bar and the wire-out time

[0047]

[0048]

[0049] Table 1 shows that when the molding pressure is lower than 15Mpa, although the thread-out time is short, its compressive strength is low, and the thread-out is accompanied by bubbles, which is prone to wire breakage and low molding accuracy. Above 15Mpa, the threading time is long and the material is easy to degrade. Therefore, the optimal molding pressure of the polylactide preformed rod in Example 1-1 of the present invention is selected to be 15Mpa. The molding pressure of other polymer material prefabricated rods can be determined according to its own properties.

Example

[0050] Examples 1-5 to 1-9:

[0051] The 5mm diameter mold in Example 1-1 was changed to 6mm, 7mm, 8mm, 9mm, and 10mm respectively, and the rest of the experimental conditions were the same as that of Example 1-1, and the required preform was finally prepared.

[0052] Table 2 The influence of the diameter of the bar on the printing and extrusion speed and the wire-out time

[0053]

[0054] Table 2 shows that the influence of bar diameter on bar extrusion speed and printing time is not obvious. It can be seen that the design freedom of bar specifications is relatively high, and it can be quantitatively designed according to clinical needs.

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Abstract

The invention discloses a fused deposition type 3D printing method based on a biopolymer prefabricated bar. According to the novel printing method, the biological prefabricated bar and a specially-made printing spray head are effectively combined. The structure principle is simple, operation is convenient, and the customized biological prefabricated bar with the higher degree of freedom can be manufactured. In subsequent application, the excellent performance of organic polymeric materials is maintained while smooth pushing, fusing and extruding of the bar are guaranteed, and pollution and waste of the biomedical polymer materials in the actual printing process are effectively avoided.

Description

Technical field [0001] The invention belongs to the technical field of biomedical engineering, and relates to a new printing method that effectively combines biopolymer prefabricated rods and cooling printing nozzles, which ensures the smooth advancement of the rods in melting and extrusion while maintaining the superior performance of the organic polymer material itself, and quantifies The bar design effectively avoids the contamination and waste of biomedical polymer materials in the actual printing process. Background technique [0002] 3D printing technology (also known as 3D rapid prototyping technology or additive manufacturing technology) is a new type of manufacturing technology, which refers to the computer-aided design (CAD) model or computer tomography (CT) data and other data under computer control , Through the accurate 3D accumulation of materials, a new digital molding technology that quickly produces 3D objects of arbitrary complex shapes. At present, 3D printing...

Claims

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Application Information

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IPC IPC(8): B29C64/118B29C64/209B33Y30/00B33Y10/00
CPCB33Y10/00B33Y30/00Y02P10/25
Inventor 徐铭恩闵敏雷鑫槐王玲
Owner REGENOVO BIOTECH
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