CN111251607A - A method for making a 3D printed intelligent integrated protective mask - Google Patents

Abstract

A manufacturing method of a 3D printing intelligent integrated protective mask belongs to the fields of 3D printing technology and medical protective gear. The present invention is a manufacturing method of an intelligent integrated protective mask with a lens anti-fog function, a body temperature real-time monitoring function, and a one-way gas flow with a mouth-nose separation type. The present invention uses SolidWorks, Magics and other software to design and optimize the main body model of the protective mask, and verifies whether the comprehensive performance of the designed model meets expectations through finite element simulation, slices the final optimized model and imports it into SLS or FDM 3D printing equipment, according to The main body of the mask is manufactured with certain printing parameters; the finished product is assembled by a series of post-processing and additional devices, and finally it has excellent mechanical properties, good sealing performance, light weight and comfort, with anti-fog function of lenses, and real-time monitoring of body temperature. Functional, one-way gas flow and nose-separated intelligent integrated protective mask.

Description

A method for making a 3D printed intelligent integrated protective mask

technical field

The invention relates to a 3D printing technology and a manufacturing method of an integrated protective face shield, belonging to the field of additive manufacturing and medical protective gear, in particular to a 3D printing intelligent integrated protective face shield prepared by using FDM or SLS technology .

Background technique

At present, the prevention and control of the new coronavirus pneumonia epidemic has entered a critical period, and the people of the whole country are working together to fight the epidemic. Under the epidemic, the vast number of medical staff and front-line workers are not afraid of difficulties and are fighting day and night on the front line of the fight against the epidemic. The current epidemic is still ongoing, and the daily consumption of medical supplies is huge, especially goggles, masks, protective clothing and other supplies are in short supply.

In addition, although traditional goggles and masks functionally give us good protection for front-line personnel, there are still many shortcomings that can be improved. For example, traditional masks are generally integrated with the mouth and nose. Wearing them for a long time is likely to re-inhale the gas containing various odors and germs exhaled from the mouth, and it will also cause blockage of airflow circulation, resulting in problems such as poor breathing for the wearer. We also noticed that in order to completely isolate the bodies of medical staff, especially the eyes, mouth and nose, from the outside world, medical goggles, masks, and full-body protective clothing all have good air tightness. However, high-intensity labor will cause medical staff to sweat a lot, and the sweat evaporates to form water vapor. When the water vapor encounters the goggles with a lower surface temperature, the water vapor will condense on the inner surface of the goggles to form condensation. Hu Jianmei from the First Hospital of Shanxi Medical University proposed measures to apply anti-fogging agent to the lenses, place an indwelling needle to seal the upper edge of the mask, and wipe the lenses with detergent. However, this method is too cumbersome and affects the work efficiency. Moreover, because the frame of traditional goggles needs to be tightly attached to the face, it will cause indentations on the faces of the medical staff wearing them, and long-term wearing will cause facial injuries, which greatly affects the work efficiency of the staff.

The one-piece protective mask we designed is for the needs of this epidemic. Due to the high risk of the working environment of medical staff and the highly infectious virus, it is also particularly important for the temperature detection of medical staff. Therefore, the one-piece protective mask Equipped with a body temperature sensor to monitor the health status of medical staff in real time. How to quickly produce the required protective equipment and improve the shortcomings of traditional masks and goggles is the focus of this project and the innovation of the integrated protective face shield.

With the progress and development of 3D printing technology, 3D printing technology is more and more widely used in the medical industry. Due to the unique molding method of 3D printing, it has obvious advantages in the personalization of products. Therefore, we propose to use SLS or FDM 3D printing technology to develop a 3D printed intelligent integrated protective face shield.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a manufacturing method of an intelligent integrated protective mask based on SLS or FDM 3D printing technology.

The present invention is realized by the following materials and devices: nylon PA2200 powder and SLS 3D printer or PLA and FDM 3D printer.

1. a method for making a 3D printing intelligent integrated protective mask, characterized in that the mask and the goggles have an integrated structure, the mask has the function of separating the mouth and nose of a unidirectional airflow, has a body temperature detection device, and is obtained by 3D printing. to make;

Specifically include the following steps:

1) Design the 3D printed intelligent integrated protective mask model through SolidWorks; ① The structure of the breathing mask is designed, and the design is based on the design concept of "separation of the mouth and nose". The breathing space of the oral cavity and the nasal cavity is divided into There are two parts, and the baffle has a conical through-hole array structure with a circle diameter of 2-3mm on the upper surface near the nose, and a circular diameter of 0.1-0.5mm on the lower surface near the mouth; the main part of the mask is designed with a diameter of 3-4mm The through-hole array structure is designed to reduce the overall weight, and the interior of the partition is designed with an interlayer inlaid with replaceable filter elements;

②The goggles have anti-fog function, the frame is made of nylon PA2200 material or PLA material, the thickness of the structure is 2-2.5mm; the lens is made of acrylic plate, the thickness is 4-5mm; the temperature difference on the surface of the frame is much larger than the temperature difference on the surface of the lens ③Protective mask The top is designed with a groove structure to place the body temperature sensor

2) Fabrication of protective masks by selective laser sintering 3D printing technology

①Printing parameters: laser power 50～130W, scanning speed 1000～2000mm/s, spot diameter 0.08～0.13mm, powder supply rate 0.06%～0.12%, circulating air rate 2.5～2.8, layer thickness 0.09～ 0.12mm, the preheating temperature is 167～171℃;

②Post-processing process: Sandblast the surface of the protective mask made by SLS, then put it into an ultrasonic oscillator for 2 to 3 minutes, and use alcohol to clean up the excess powder on the surface;

Made by Fused Deposition Manufacturing (FDM) 3D printing technology:

Printing parameters: preheating temperature 150～200℃, printing layer thickness 0.1～0.5mm, printing speed 30～120mm/s, nozzle flow rate 24cc/h, filling rate 50%～100%.

The contact part of the protective mask with the human face has a round chamfer groove design, the round chamfer diameter is 0.5mm, and the groove width is 0.5mm.

There are rope perforations on the left and right sides of the frame and the main structure of the mask. The elastic band passes through the through holes and bypasses the back neck and back of the human body for fixing.

The present invention is achieved through the following technical solutions:

1. Use 3D modeling software to design the model

The structure of goggles and mask is designed, and the through-hole structure of the array is added on the surface of the main structure of the mask to realize air circulation and reduce the overall weight of the mask. Design the mouth-nose separation baffle and the filter element sandwich structure; design the groove for placing the body temperature sensor; perform local optimization of the structure, Boolean operation, overall assembly, and finally obtain a complete protective mask model.

2. Perform relevant performance simulations on the models involved

Import the processed model into ANSYS. Aiming at the mechanical properties of the mask, the static anti-compression performance was verified by adding a fixed load, and the degree of damage to the structure after falling to the ground was verified by collision simulation. The anti-fog performance of the goggles is verified by thermodynamic simulation and fluid simulation. With feedback from the simulation results, the model is modified and optimized until it meets the desired performance.

3. Carry out the 3D printing production process

SLS molding method: slice the model and import it into the 3D printing equipment; clean the equipment, preheat, set the printing parameters, the laser power is 50~130W, the scanning speed is 1000~2000mm/s, and the spot diameter is 0.08~0.13mm. The powder rate is 0.06%-0.12%, the circulating air rate is 2.5-2.8, the layer thickness is 0.09-0.12mm, and the preheating temperature is 167-171°C.

After the molding process, after 10 to 15 hours of cooling, the surface of the protective mask made of SLS is sandblasted with 1.5mm glass beads to make the surface smoother, and then put into 0.4W/cm2 ultrasonic The shaker is shaken for 2 to 3 minutes, and the excess powder on the surface is cleaned up with alcohol.

FDM molding method: slice the model, import it into the equipment, put the PLA wire into the equipment, set the preheating temperature to 150~200℃, the printing layer thickness is 0.1~0.5mm, the printing speed is 30~120mm/s, and the nozzle flow rate is 24cc /h, the filling rate is 50% to 100%.

After obtaining the molded object, fix the customized elastic band with a width of 2-4mm through the through hole; put the KN95 mask filter element into the baffle interlayer of the mouth and nose part; use a laser cutting machine to cut the acrylic plate according to the size of the model to make the lens, Insert into the groove of the frame; finally put the body temperature sensor into the groove on the top.

The present invention has the following innovations:

(1) The present invention integrates the design and manufacture of the protective mask and the goggles, fully utilizes the advantages of 3D printing, has excellent sealing performance, and can effectively isolate pollutants such as droplets, dust, and pollen. By combining the goggles and the mask into one and its convenient design, users can wear it easily, saving time and effort.

(2) The design of traditional masks is usually integrated with the mouth and nose, and the exhaled gas from the mouth and nose will be mixed together, affecting the breathing experience. The gas that can be exhaled from the nasal cavity flows into the breathing space of the oral cavity, which not only ensures that the heat flow will not affect the eyes, nor will the taste of the oral gas affect the wearing experience.

(3) The traditional method of fixing the mask is to hang it on the ears through the straps on both sides. Although this fixing method is reasonable, it will cause strangulation to the user's ears after wearing it for a long time. The present invention uses a new type of strap design, the strap does not contact the ear, but is fixed on the back of the head by a fixing device. Of course, the fixing device adopts a comfortable and lightweight structure design, which will not cause any damage to the user. of discomfort.

(4) The goggles of the 3D printed intelligent integrated protective mask have good anti-fogging characteristics. The way to achieve this is to make the temperature difference between the inside and outside of the lens part much smaller than the temperature difference of the frame part through the optimized design of the structure, so that the frame part The water mist is preferentially generated and eliminated in time to prevent the lens from fogging.

(5) Compared with disposable masks, the biggest disadvantage of durable masks is that the weight is not light enough, and long-term wearing will cause discomfort such as soreness. In order to improve such problems, the 3D printed intelligent integrated protective mask adopts a topology-optimized porous structure design. Through the porous structure, it not only ensures the mechanical performance requirements of use, but also greatly reduces the weight and greatly improves the comfort.

(6) The infrared temperature sensor design of the 3D printed intelligent integrated protective mask is to install an infrared body temperature sensor above the goggles, so as to monitor the user's body temperature in real time, detect whether the medical staff has fever symptoms, and pay attention to the wearer in time. Health status.

(7) The production method of FDM or SLS 3D printing is selected. The FDM and SLS processes do not need to add support, and the shape of the model can be truly restored. The designer does not need to consider the manufacturing problems, which enables the design of the parts to be designed from an integrated concept. , so as to improve the strength and reliability of the parts, shorten the production cycle and realize personalized customization.

Description of drawings

Figure 1 is the baffle designed by the intelligent integrated protective mask for the function of separating the mouth and nose with one-way airflow

Figure 2 is the elastic lace perforation

Figure 3 is the groove where the temperature sensor is placed

Figure 4 is the tapered hole and sliding slot of the mouth-nose separation baffle

Mouth and nose separation mask split baffle-1

Elastic Lace Perforation - 2

Recess for placing temperature sensor-3

Separation baffle tapered hole-4

Separation baffle sliding slot-5

Detailed ways

Example 1:

1. Use Solidworks to design the goggle frame and mask structure, and add an array of through-hole structures on the surface of the main structure of the mask. Design the mouth-nose separation baffle and the filter element sandwich structure; design the groove for placing the body temperature sensor; use Magics to perform local structural optimization, Boolean operations, overall assembly, and finally obtain a complete protective mask model.

2. Use ANSYS to perform finite element simulation on the preliminary designed model

Static mechanics and crash simulation results:

The deformation of the mask under the pressure of 100N is less than 0.1mm, and the protective mask falls from a height of 2m to the ground, and its structural deformation is less than 2.8×10 ^-4 mm.

Thermodynamic Simulation and Fluid Results:

Simulates the temperature distribution of the human body wearing a protective mask. At room temperature, within 4 hours, the temperature difference between the inside and outside of the lens is much lower than the temperature difference between the inside and outside of the frame, and the fog is generated on the surface of the frame and can flow to the bottom of the frame in time. The performance reflected by the simulation results meet the design requirements.

3. Slice the final optimized model, import it into the SLS 3D printing equipment, and set the printing parameters: laser power 60W, scanning speed 1400mm/s, spot diameter 0.12mm, powder supply rate 0.09%, and circulating air rate 2.5, the layer thickness is 0.12mm, the preheating temperature is 169.9°C, and the printing process is implemented. After the molding process, after 15 hours of cooling, the surface of the protective mask made of SLS was sandblasted through 1.5mm glass beads to make the surface smoother, and then placed in an ultrasonic vibration of 0.4W/ ^cm2 Clean the excess powder on its surface with alcohol to get a complete one-piece protective mask.

4. Printing by FDM molding: slice the model, import it into the equipment, put the PLA wire into the equipment, set the preheating temperature to 200℃, the printing layer thickness is 0.1mm, the printing speed is 50mm/s, and the nozzle flow rate is 24cc/ h, the filling rate is 98%.

5. Fix the elastic band with a width of 2mm through the through hole; put the KN95 mask filter element into the baffle interlayer of the mouth and nose part, and push the card slot inward to fix it; use a laser cutting machine to cut the acrylic plate according to the size of the printed model As a lens, it is embedded in the groove of the frame; finally, the body temperature sensor is placed in the groove.

Claims (3)

1. a method for making a 3D printing intelligent integrated protective mask, characterized in that the mask and the goggles have an integrated structure, the mask has the function of separating the mouth and nose of a unidirectional airflow, has a body temperature detection device, and is obtained by 3D printing. to make; Specifically include the following steps: 1) Design the 3D printed intelligent integrated protective mask model through SolidWorks; ① The structure of the breathing mask is designed, and the design is based on the design concept of "separation of the mouth and nose". The breathing space of the oral cavity and the nasal cavity is divided into There are two parts, and the baffle has a circular diameter of 2-3mm near the nose on the upper surface, and a conical through-hole array structure with a diameter of 0.1-0.5mm on the lower surface near the mouth; the main part of the mask is designed with a diameter of 3-4mm. The through-hole array structure reduces the overall weight, and the interior of the partition is designed with an interlayer inlaid with replaceable filter elements; ②The goggles have anti-fog function, the frame is made of nylon PA2200 material or PLA material, the thickness of the structure is 2-2.5mm; the lens is made of acrylic plate, the thickness is 4-5mm; the temperature difference on the surface of the frame is much larger than the temperature difference on the surface of the lens ③Protective mask The top is designed with a groove structure to place the body temperature sensor 2) Fabrication of protective masks by selective laser sintering 3D printing technology ①Printing parameters: laser power 50～130W, scanning speed 1000～2000mm/s, spot diameter 0.08～0.13mm, powder supply rate 0.06%～0.12%, circulating air rate 2.5～2.8, layer thickness 0.09～ 0.12mm, the preheating temperature is 167～171℃; ②Post-processing process: Sandblast the surface of the protective mask made by SLS, then put it into an ultrasonic oscillator for 2 to 3 minutes, and use alcohol to clean up the excess powder on the surface; Made by Fused Deposition Manufacturing (FDM) 3D printing technology: Printing parameters: preheating temperature 150～200℃, printing layer thickness 0.1～0.5mm, printing speed 30～120mm/s, nozzle flow rate 24cc/h, filling rate 50%～100%. 2. method according to claim 1, is characterized in that: The contact part of the protective mask with the human face has a round chamfer groove design, the round chamfer diameter is 0.5mm, and the groove width is 0.5mm. 3. method according to claim 1, is characterized in that: There are rope perforations on the left and right sides of the frame and the main structure of the mask. The elastic band passes through the through holes and bypasses the back neck and back of the human body for fixing.

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