A flat mask production system and its manufacturing method

Abstract

The present invention discloses a flat mask production system, comprising: a feeding unit, a product folding unit, a nose clip adding unit, a mask body sealing unit, an elastic earloop cutting unit, a joining unit, and a product cutting unit. The present invention also discloses a manufacturing method for a flat mask, which comprises the following steps: a step of stacking and conveying a mask body strip, a step of folding the mask body strip, a step of adding a nose clip, a step of sealing the mask body strip, a step of adding elastic earloops, a step of sealing the elastic earloops, and a step of cutting the product. By arranging the product cutting step as the last step, the present invention can eliminate the problems of high manufacturing cost and complex structure caused by using a direction adjusting device, and can reduce the transportation instability caused by cutting the mask body and elastic earloops in the intermediate steps, making the transportation of the entire mask body strip more stable and accurate during the processing, ensuring the processing accuracy of the mask, and improving the product quality.

Description

Technical Field

[0001] The present invention relates to the technical field of mask processing, and more particularly to a flat mask production system and a manufacturing method thereof. Background Art

[0002] China is the largest mask producer in the world, with nearly 50% of its production capacity exported annually. Most mask manufacturers use domestic equipment. Currently, most disposable mask production lines in the domestic market are intermittent combined splicing production lines. This production line manufactures disposable masks with certain filtering performance by processes such as thermocompression lamination, folding and forming, ultrasonic welding, waste removal, and earloop welding of multiple layers of non-woven fabric. Limited by the processing method, this production method generally can only reach 60 - 80 pieces per minute, making it difficult to solve the mask supply problem in a short time. A flat mask, as a commonly used mask form, consists of a mask body and ear loops. The mask body is a flat structure, and the ear loops can be in the form of ear strings or elastic non-woven fabric.

[0003] This application aims to provide a novel flat mask production system and a manufacturing method thereof to solve the above problems existing in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a flat mask production system to solve the problems of low production efficiency and low intelligent level existing in the existing production system.

[0005] Another purpose of the present invention is to provide a manufacturing method of a flat mask to solve the problem of low production efficiency of the existing mask manufacturing method.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a flat mask production system for continuously processing flat masks. The flat mask has a mask body portion that covers the nose and mouth of the wearer when worn, and elastic ear tabs connected to the mask body portion; the elastic ear tabs are laminated on a certain surface of the mask body portion in a two-side combination manner. The outer edge of the elastic ear tab has a preset outer edge contour curve, and an easy tear line is also provided in the middle of the elastic ear tab. The easy tear line divides the elastic ear tab into a left ear loop and a right ear loop, and the easy tear line is configured to be able to release the connection of the easy tear line by pulling each ear loop by hand. The above-mentioned flat mask production system includes:

[0007] A feeding unit that continuously conveys the mask body strip in a set stacking order;

[0008] A product folding unit that folds the stacked mask body strip to form multiple folds extending along the conveying direction of the mask body strip;

[0009] A nose clip adding unit for adding a nose clip onto the upper surface of the strip of the mask main body along the conveying direction of the strip of the mask main body and keeping the nose clip flat;

[0010] A mask main body sealing unit for sealing at least two sides of the strip of the mask main body along the conveying direction;

[0011] An elastic earloop cutting unit for cutting the continuous elastic earloop strip into an outer shape and performing a dotted line cut at a position corresponding to the tear line, so that the cut elastic earloop strip can be continuously conveyed and is arranged on the strip of the mask main body output by the mask main body sealing unit;

[0012] A joining unit for sealing a specified position of the strip of the mask main body provided with the elastic earloop strip, so that each elastic earloop on the elastic earloop strip is joined to the mask main body in a two-side joining manner;

[0013] And a product cutting unit for cutting the joined continuous strip to form independent products.

[0014] Furthermore, the elastic earloop cutting unit includes an elastic earloop dotted line cutting device and an elastic earloop outer shape cutting knife device. The elastic earloop dotted line cutting device is used for performing a dotted line cut at the position where the left earloop and the right earloop are connected, so as to form a tear line extending along the width direction on the elastic earloop. The elastic earloop outer shape cutting knife device completes cutting the elastic earloop strip to obtain the required shape profile of the elastic earloop. Of course, the cutting of the tear line and the shape profile of the elastic earloop can also be completed simultaneously in one device.

[0015] To achieve the purpose of the present invention, the effect of the dotted line cut at the position where the left and right earloops are connected in the elastic earloop cutting unit plays an important role. When in use, a co-edge dotted line cut method is selected, so that the tear line can be configured to be disconnected by pulling each earloop by hand, that is, it has a connection strength lower than the specified tensile load. In addition, the elastic earloop strip has a stretchable direction and a non-stretchable direction that are perpendicular to each other, and the elastic earloop strip is conveyed along the stretchable direction of the elastic earloop strip.

[0016] As a specific embodiment of the present invention, to improve the stability of transportation and prevent the nose clip from shifting, wrinkling, or running off track during transportation, the mask body sealing unit includes a side sealing device disposed after the nose clip adding unit and an end sealing device disposed after the side sealing device. Among them, the side sealing device seals the two sides of the mask body strip along the transportation direction and fixes the nose clip; the end sealing device seals the ends of the mask body strip perpendicular to the transportation direction to prevent the wrinkles from spreading. Further, the side sealing device and the end sealing device are integrated or separated, and they are sealed by heat sealing or ultrasonic welding. Preferably, an integrated structure and ultrasonic welding method are adopted. However, the above specific embodiment should not be understood as the only form of the mask body sealing unit. For example, under the premise of a short transportation distance, only the aforementioned side sealing device can be provided, and the end sealing device can be provided together with the subsequent combining unit, and the purpose of this application can also be achieved.

[0017] Further, the combining unit is sealed by heat sealing or ultrasonic welding.

[0018] To meet the requirement of stable welding under the premise of high-speed transportation, the combining unit includes an ultrasonic vibration component, a pattern roller, a fine-tuning mechanism, and a driving mechanism. The fine-tuning mechanism is connected to the ultrasonic vibration component and can make a micro-adjustment to the gap between the welding head and the pattern roller. The ultrasonic vibration component and the fine-tuning mechanism together form a moving component. The driving mechanism is connected to the moving component and is used to control the stroke between the welding head on the moving component and the pattern roller. The stroke path is the same as or opposite to the path of the fine-tuning mechanism for micro-adjusting the gap.

[0019] Specifically, the driving mechanism has a substrate, a first slider connected to the moving component and capable of linear movement along the substrate, and a driving part; the fine-tuning mechanism includes a support plate connected to the first slider, a second slider connected to the ultrasonic vibration component and capable of linear movement along the support plate, a piezoelectric driver disposed on one side of the support plate, and a pressure sensor cooperating with the piezoelectric driver; a spring is further disposed on the other side of the support plate, and the spring can press the ultrasonic vibration component against the end face of the piezoelectric driver through the pressure sensor.

[0020] To seal the elastic earpieces to the inner side of the mask body, the inner side refers to the side that contacts the human skin when worn, that is, the elastic earpieces are sealed to the inner layer of the mask. A flipping device for flipping the mask body up and down is also provided on the conveying route between the mask body sealing unit and the product cutting unit. Generally, the elastic earpieces are sealed to the inner layer of the mask body, while the nose clip is usually fixed to the outer layer of the mask body. Therefore, the function of setting the flipping device is to flip the non-woven fabric sheet after adding the nose clip up and down and ensure that the subsequent elastic earpieces are sealed to the inner layer of the mask body. If this device is omitted, the sealing part of the elastic earpieces and the fixing part of the nose clip are on the same side of the mask body, which does not conform to the usage habits of general wearers.

[0021] To ensure the flatness of the nose clip and avoid the nose clip being bent and affecting the subsequent sealing of the mask body by the sealing unit, the nose clip adding unit includes a set of adjusting wheels arranged along the conveying direction of the mask body strip for straightening the nose clip, and the adjusting wheels act alternately on the upper surface and the lower surface of the nose clip.

[0022] As another subject of the present invention, a manufacturing method of a flat mask is used for continuously processing a flat mask, which has a mask body covering the nose and mouth of the wearer when worn, and elastic earpieces connected to the mask body; the elastic earpieces are laminated on a certain surface of the mask body in a two-side combination manner, the outer edge of the elastic earpiece has a preset outer edge contour curve, and an easy-to-tear line is also provided in the middle of the elastic earpiece, and the easy-to-tear line divides the elastic earpiece into a left ear hook and a right ear hook, and the easy-to-tear line is configured to be able to release the connection of the easy-to-tear line by pulling each ear hook by hand. The above manufacturing method includes the following steps:

[0023] S1: Mask body strip stacking and conveying step, conveying each layer of sheet material strip of the mask body along the process direction, and continuously conveying the layers of sheet material strips in an overlapping manner according to the set stacking order of the mask body.

[0024] S2: Mask body strip folding step, folding the stacked mask body strip to form multiple folds on the mask body strip.

[0025] S3: Nose clip adding step, adding the nose clip on the upper surface of the mask body strip, and then folding the mask body.

[0026] S4: Mask body strip sealing step, sealing at least on the side of the mask body strip to fix the nose clip.

[0027] S5: Elastic earpiece adding step: Convey the elastic earpiece strip along the retractable direction of the elastic earpiece, cut the elastic earpiece strip to form the unique shape of the elastic earpiece, and perform a dotted cut at the connection of the left and right ear loops. Arrange the cut elastic earpieces on the mask body strip and convey them forward together with the mask body strip;

[0028] S6: Elastic earpiece sealing step: Seal the elastic earpieces arranged on the mask body strip with the mask body strip, so that each elastic earpiece on the elastic earpiece strip is joined to the mask body in a two-sided combination manner;

[0029] S7: Product cutting step: Cut the joined continuous strip to form independent products.

[0030] For the convenience of adding the nose clip, in the step S1, the outer layer sheet of the mask body in each layer of the mask body strip material is conveyed at the top of each layer of sheets, and the inner layer sheet of the mask body is conveyed at the bottom of each layer of sheets.

[0031] After the step S4, a sheet turning process is also provided. The sheet turning process turns the sealed mask body strip, so that the mask body strip is conveyed forward with the outer layer sheet at the top of each layer of sheets changed to the inner layer sheet at the top of each layer of sheets. Generally, the elastic earpieces are sealed on the inner layer sheet of the mask body, and the nose clip is usually fixed on the outer layer sheet of the mask body. Therefore, the function of setting the turning process is to turn the mask body strip after adding the nose clip up and down, and ensure that the subsequent elastic earpieces are sealed on the inner layer sheet of the mask body. If this device is omitted, the sealing part of the elastic earpiece and the fixing part of the nose clip are on the same side of the mask body, which does not conform to the usage habits of general wearers.

[0032] Furthermore, both the mask body strip sealing step in the step S4 and the elastic earpiece sealing step in the step S6 are achieved by heat sealing or ultrasonic welding.

[0033] To improve the stability of high-speed sealing and ensure product quality, both the mask body strip sealing step in the step S4 and the elastic earpiece sealing step in the step S6 are sealed by an ultrasonic welding device. The ultrasonic welding device includes an ultrasonic vibration component, a pattern roller, a fine adjustment mechanism, and a driving mechanism. The fine adjustment mechanism is connected to the ultrasonic vibration component and can make a micro-adjustment of the gap between the welding head and the pattern roller. The ultrasonic vibration component and the fine adjustment mechanism together form a moving component. The driving mechanism is connected to the moving component and is used to control the stroke between the welding head on the moving component and the pattern roller. The stroke path is the same as or opposite to the path of the micro-adjustment of the gap by the fine adjustment mechanism.

[0034] Further, the driving mechanism includes a substrate, a first slider connected to the moving component and capable of linearly moving along the substrate, and a driving part; the fine-tuning mechanism includes a support plate connected to the first slider, a second slider connected to the ultrasonic vibration component and capable of linearly moving along the support plate, a piezoelectric driver disposed on one side of the support plate, and a pressure sensor cooperating with the piezoelectric driver; a spring is further disposed on the other side of the support plate, and the spring can press the ultrasonic vibration component against the end face of the piezoelectric driver via the pressure sensor.

[0035] Advantages of the present invention:

[0036] The mask manufacturing method of the present invention can achieve high-speed and stable production of masks. Compared with the traditional mask production process, the production speed can reach 800 - 1000 pieces per minute, and the daily production capacity can reach more than 1 million pieces. Compared with the previous mask production methods, the production speed is increased by more than 10 times.

[0037] The present invention sets the product cutting step at the last step, which can save the problems of high manufacturing cost and complex structure caused by using the orientation device, and can reduce the transportation instability caused by the cutting of the mask main body and the elastic earpieces in the intermediate steps, making the transportation of the entire mask main body strip more stable and accurate during the processing, ensuring the processing accuracy of the mask and improving the product quality.

[0038] Hereinafter, the present invention will be described in more detail with reference to the drawings and embodiments. Description of the Drawings

[0039] Figure 1 It is a top view of the mask produced by the present invention as observed from the outer side.

[0040] Figure 2 It is a top view of the mask produced by the present invention as observed from the inner side.

[0041] Figure 3 It is a cross-sectional view of the mask main body produced by the present invention.

[0042] Figure 4 It is a schematic structural diagram of the production system of the present invention.

[0043] Figure 5 It is a schematic structural diagram of the ultrasonic welding device in the present invention. Detailed Embodiments

[0044] Embodiment, a method for manufacturing a mask, used for continuously processing masks, as Figure 1 、 Figure 2 shown, the mask has a longitudinal direction y and a transverse direction x, and includes a mask main body 101 that covers the nose and mouth of the wearer when worn, and elastic earpieces 102 combined with the mask main body 101 by ultrasonic welding or hot melting.

[0045] Among them, the mask main body 101 includes an outer layer sheet 1011, an inner layer sheet 1012 that are superposed on each other, and a meltblown filter layer disposed between the outer layer sheet 1011 and the inner layer sheet 1012. The mask main body 101 is folded and formed into a plurality of pleats 1014 along the transverse direction, and the pleats 1014 can be unfolded longitudinally in the middle area of the mask main body 101. The sizes of the outer layer sheet 1011, the inner layer sheet 1012, and the filter sheet are not required to be the same. After the mask main body strip is sealed, a transverse sealing portion 1015 and a longitudinal sealing portion 1016 are formed around the mask main body. At the same time, as Figure 3 shown, the laminate composed of the outer layer sheet 1011, the inner layer sheet 1012, and the meltblown filter layer is folded inwardly toward the inner surface side after being laminated, and the nose clip 1013 is wrapped therein and sealed, that is, the nose clip 1013 is wrapped in the transverse sealing portion 1015. The elastic earpiece 102 is made of elastic stretch non-woven fabric.

[0046] In order to efficiently produce the above-mentioned mask, the present invention discloses a method for manufacturing a mask, as Figure 4 shown, the manufacturing method first stacks the mask main body strip through the feeding unit 1, and then folds the stacked mask main body strip through the product folding unit 2 to form a plurality of pleats extending along the conveying direction of the mask main body strip; then adds the nose clip through the nose clip adding unit 3 and keeps the nose clip flat; after the nose clip is added, the mask main body sealing unit 4 seals the mask main body strip along the transverse and longitudinal directions of the mask main body; then the elastic earpiece adding unit 5 conveys the elastic earpiece strip along the stretchable direction of the elastic earpiece, cuts the elastic earpiece strip to form the unique shape of the elastic earpiece, and sets a tear line on the earpiece, and conveys the cut elastic earpiece to the mask main body strip; then the elastic earpiece sealing unit 6 completes the sealing of the elastic earpiece and the mask main body strip, and finally the product cutting unit 7 divides the mask main body strip with the elastic earpiece sealed into individual mask products.

[0047] Specifically, in step S1, the strip of the mask main body is conveyed in an overlapping manner. The corresponding feeding unit 1 includes an inner layer sheet conveying roller 11, an outer layer sheet conveying roller 12 and a sheet overlapping device 13. The filter sheet located between the outer layer sheet 1011 and the inner layer sheet 1012 can be a single-layer structure or a multi-layer overlapping structure. The filter sheet can be first compounded with the outer layer sheet 1011 or the inner layer sheet 1012 and then enter the sheet overlapping device 13 together, or can directly enter the sheet overlapping device 13 alone. In this embodiment, the filter sheet has a two-layer structure, one layer is a non-woven fabric filter layer, and the other layer is a melt-blown filter layer. When the sheets are overlapped, the outer layer sheet 1011 is conveyed above the inner layer sheet 1012. The non-woven fabric filter layer is first compounded with the outer layer sheet 1011 on the outer layer sheet conveying roller 11 and then sent into the sheet overlapping device 13 together; the melt-blown filter layer directly enters the sheet overlapping device 13 for compounding.

[0048] The strip of the mask main body after compounding enters the product folding device 21 in the product folding unit 2 corresponding to step S2 of folding the strip of the mask main body. Under the action of the product folding device 21, the overlapped strip of the mask main body is folded to form a plurality of folds extending along the conveying direction of the strip of the mask main body.

[0049] After step S2 of folding the strip of the mask main body is completed, the strip of the mask main body enters step S3 of adding a nose clip. The nose clip adding unit 3 corresponding to step S3 of adding a nose clip includes a set of adjusting wheels 31 arranged along the conveying direction of the strip of the mask main body, and the adjusting wheels 31 alternately act on the upper surface and the lower surface of the nose clip. A folding device for folding the inner layer sheet 1012 upward to cover the nose clip is also provided. The nose clip is first placed above the sheet of the mask body through a nose clip adding device, and then the side edge of the inner layer sheet 1012 is folded upward to cover the nose clip through the folding device, and then the nose clip is straightened by the adjusting wheels 31.

[0050] After the nose clip is added, the strip of the mask main body enters step S4 of sealing the strip of the mask main body. The mask main body sealing unit 4 corresponding to step S4 of sealing the strip of the mask main body includes a side sealing device 41 arranged after the nose clip adding unit 3 and an end sealing device 42 arranged after the side sealing device 41. The side sealing device 41 seals the two sides of the strip of the mask main body along the transverse direction of the mask main body to form a set of continuous transverse sealing parts 1015 on both sides of the strip of the mask main body and fix the nose clip; the end sealing device 42 seals the strip of the mask main body along the longitudinal direction of the mask main body, so as to form a set of longitudinal sealing parts 1016 extending along the longitudinal direction of the mask main body at intervals on the strip of the mask main body, and a mask main body 1011 is formed between two adjacent longitudinal sealing parts 1016. The side sealing device 41 and the end sealing device 42 can also be one device.

[0051] The strip of the mask body after sealing is continuously conveyed forward, and elastic earpieces are added during the conveying process, that is, the elastic earpiece adding step S5. The elastic earpiece cutting and adding device 5 corresponding to the elastic earpiece adding step S5 includes a guiding roller 51, a cutting roller 52, a cooperating roller 53, a conveying roller 54, and a belt conveying unit 55. The elastic earpiece strip enters the guiding roller 51 along the stretchable direction of the elastic earpiece, and then, under the cooperation of the cutting roller 52 and the cooperating roller 53, a specified outer edge contour shape is formed on the elastic earpiece strip, and a tear line is formed. Then, it is conveyed toward the belt conveying unit 55 by the conveying roller 54. The belt conveying unit 55 receives the strip of the mask body from the direction of the mask body sealing unit 4 while receiving the elastic earpiece strip from the direction of the conveying roller 54.

[0052] The strip of the mask body and the elastic earpieces are conveyed to the elastic earpiece sealing unit 6 together to complete the elastic earpiece sealing step S6. Under the action of the sealing device 61 of the elastic earpiece sealing unit 6, the connection between the elastic earpieces and the strip of the mask body is completed, so that both ends of the elastic earpiece in the stretchable direction are joined and fixed within the region between two adjacent longitudinal sealing portions of the strip of the mask body.

[0053] The strip of the mask body after sealing enters the product cutting unit 7 to complete the product cutting step S7. The product cutting unit 7 includes a cutting device 71. The cutting device 71 cuts the strip of the mask body after the elastic earpieces are joined longitudinally along the mask body and at the middle position of the longitudinal sealing portion of the strip of the mask body, thereby forming individual mask products.

[0054] Here, it should be noted that the side sealing device 41, the end sealing device 42, and the sealing device 61 can be thermal sealing devices, but in order to obtain better thermal sealing effects and improve the softness of the mask sealing part at the same time, the side sealing device 41, the end sealing device 42, and the sealing device 61 are preferably ultrasonic welding devices.

[0055] The ultrasonic welding device is as Figure 5 shown. This ultrasonic welding device includes: an ultrasonic vibration assembly 4101, a pattern roller 4102, a fine adjustment mechanism 4103, and a driving mechanism 4104. Among them, the fine adjustment mechanism 4103 is connected to the ultrasonic vibration assembly 4101 and can make a micro adjustment of the gap between the welding head 401 and the pattern roller 4102. The ultrasonic vibration assembly 4101 and the fine adjustment mechanism 4103 together constitute a moving assembly.

[0056] The driving mechanism 4104 is connected to the moving component and is used to control the large displacement stroke between the welding head 401 on the moving component and the pattern roller 4102. On the ultrasonic vibration component 4101, a first fitting portion 402 and a second fitting portion 403 are also fixed on both sides of the second slider 432.

[0057] The structures of the driving mechanism 4104 and the fine adjustment mechanism 4103 will be further described below.

[0058] The driving mechanism 4104 includes a substrate 441, a first slider 442 connected to the moving component and capable of linear movement along the substrate, a cylinder 443, and a limit block 444. The stroke of the cylinder 444 is 10 - 30 mm, and the output pressure of the cylinder during the welding process is 100 - 1500 N. The main shaft of the cylinder 444 acts on the support plate 431 connected to the first slider. The limit block 444 is arranged on the substrate 441 on the stroke of the moving component close to the pattern roller. When the first slider abuts against the limit block, the distance between the end face of the welding head and the surface of the pattern roller is 0.06 - 0.15 mm. The fine adjustment mechanism 4103 includes: a support plate 431 connected to the first slider, a second slider 432 connected to the ultrasonic vibration component and capable of linear movement along the support plate, a piezoelectric actuator 433 arranged on one side of the support plate, and a pressure sensor 434 cooperating with the piezoelectric actuator. A spring 435 is also arranged on the other side of the support plate. The stroke range of the piezoelectric actuator 433 is 0.08 - 0.2 mm, and the maximum thrust range that can be output is 4000 - 8000 N. A first mounting block 436 and a second mounting block 437 are respectively fixed on both sides of the support plate 431. The spring 435 is arranged between the first mounting block 436 and the first fitting portion 402, the pressure sensor 434 is mounted on the second fitting portion 403, and the piezoelectric actuator 433 is mounted on the second mounting block 437. When performing the welding operation, the spring 435 can press the ultrasonic vibration component against the end face of the piezoelectric actuator 433 through the pressure sensor 434.

[0059] During operation, the cylinder pushes the moving component to a preset position and abuts against the limit block. At this time, the distance between the end face of the welding head and the surface of the pattern roller is 0.06 - 0.15 mm. Then, under the action of the piezoelectric actuator, the welding head of the ultrasonic vibration component approaches the pattern roller in the form of micro-displacement. During the process of the welding head approaching the pattern roller, the piezoelectric sensor detects the reaction welding force of the pattern roller on the ultrasonic vibration component and compares it with the preset welding force. According to the comparison result, the piezoelectric actuator controls the welding head of the ultrasonic vibration component to approach or move away from the pattern roller. The above piezoelectric actuator has a sub-micron-level position adjustment accuracy and a millimeter-level response time, which can make the adjustment of the welding force have high precision and high responsiveness. The cylinder has a preset welding force safety threshold value and can realize the large-displacement movement of the welding head. By adopting the above scheme of combining the cylinder and the piezoelectric actuator, the large-displacement and micro-displacement adjustment of the welding head relative to the pattern roller can be realized, so as to achieve the purpose of ultrasonic continuous welding production.

[0060] In addition, if the elastic earpiece is to be sealed on the inner layer sheet of the mask body part, a sheet turning process needs to be set after step S4. Through the sheet turning process, the sealed mask body part strip is turned over, so that the mask body part strip is conveyed forward with the outer layer sheet on the upper side of each layer of sheet changed to the inner layer sheet on the upper side of each layer of sheet. The sheet turning process is correspondingly provided with a turning device 8, which is composed of a plurality of rollers.

[0061] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A flat mask production system for continuously processing flat masks. The flat mask has a mask body portion that covers the nose and mouth of the wearer when worn, and elastic ear loops connected to the mask body portion; the elastic ear loops are laminated on a certain surface of the mask body portion in a two-side combination manner. The outer edge of the elastic ear loop has a preset outer edge contour curve, and an easy-tear line is also provided in the middle of the elastic ear loop. The easy-tear line divides the elastic ear loop into a left ear hook and a right ear hook, and the easy-tear line is configured to be able to release the connection of the easy-tear line by pulling each ear hook with the hand; it is characterized in that, The flat mask production system includes: A feeding unit that continuously conveys the mask body strip in a set stacking order; A product folding unit that folds the stacked mask body strip to form multiple wrinkles extending along the conveying direction of the mask body strip; A nose clip adding unit that adds a nose clip to the upper surface of the mask body strip along the conveying direction of the mask body strip and keeps the nose clip flat; A mask body sealing unit that seals at least two sides of the mask body strip along the conveying direction; An elastic earpiece cutting unit that cuts the continuous elastic earpiece strip into a shape and makes a dotted cut at the corresponding position of the tear line, so that the cut elastic earpiece strip remains continuously conveyed and is arranged on the mask body strip output by the mask body sealing unit; A joining unit that seals a specified position of the mask body strip with the elastic earpiece strip arranged thereon, so that each elastic earpiece on the elastic earpiece strip is joined to the mask body in a two-side joining manner; And a product cutting unit that cuts the joined continuous strip to form independent products; The joining unit includes an ultrasonic vibration assembly, a pattern roller, a fine adjustment mechanism, and a driving mechanism. The fine adjustment mechanism is connected to the ultrasonic vibration assembly and can make a micro adjustment to the gap between the welding head and the pattern roller. The ultrasonic vibration assembly and the fine adjustment mechanism together form a moving assembly. The driving mechanism is connected to the moving assembly and is used to control the stroke between the welding head and the pattern roller on the moving assembly. The stroke path is the same as or opposite to the path of the micro adjustment of the gap by the fine adjustment mechanism; The driving mechanism has a substrate, a first slider connected to the moving assembly and capable of linear movement along the substrate, and a driving part; the fine adjustment mechanism includes a support plate connected to the first slider, a second slider connected to the ultrasonic vibration assembly and capable of linear movement along the support plate, a piezoelectric driver arranged on one side of the support plate, and a pressure sensor cooperating with the piezoelectric driver; a spring is also arranged on the other side of the support plate, and the spring can press the ultrasonic vibration assembly against the end face of the piezoelectric driver through the pressure sensor; The stroke range of the piezoelectric driver is 0.08 - 0.2 mm, and the maximum thrust range that can be output is 4000 - 8000 N; During the process of the welding head approaching the pattern roller, the piezoelectric sensor detects the reaction welding force of the pattern roller on the ultrasonic vibration assembly and compares it with the preset welding force. According to the comparison result, the piezoelectric driver controls the welding head of the ultrasonic vibration assembly to approach or move away from the pattern roller. The piezoelectric driver has a position adjustment accuracy of sub-micron level and a response time of millimeter level.

2. The flat mask production system according to claim 1, wherein: The elastic earpiece cutting unit includes a split or integrated elastic earpiece dotted cutting device and an elastic earpiece shape cutting knife device. The elastic earpiece dotted cutting device is used to make a dotted cut at the connected position of the left ear hook and the right ear hook to form a tear line extending along the width direction on the elastic earpiece. The elastic earpiece shape cutting knife device completes the cutting of the elastic earpiece strip to obtain the required shape contour of the elastic earpiece.

3. The flat mask production system according to claim 1, wherein: The elastic lug strip has a stretchable direction and a non-stretchable direction that are orthogonal to each other, and the elastic lug strip is conveyed along the stretchable direction of the elastic lug strip.

4. A manufacturing method of a flat mask for continuously processing a flat mask, the flat mask having a mask body portion that covers the nose and mouth of the wearer when worn, and elastic ear loops connected to the mask body portion; the elastic ear loops are laminated on a certain surface of the mask body portion in a bilateral combination manner, the outer edge of the elastic ear loop has a preset outer edge contour curve, and a tear line is further provided in the middle of the elastic ear loop, the tear line divides the elastic ear loop into a left ear hook and a right ear hook, and the tear line is configured to be able to release the connection of the tear line by pulling each ear hook with the hand; characterized in that, The manufacturing method of the flat mask includes the following steps: S1: Mask body strip stacking and conveying step, conveying each layer of sheet material strip of the mask body along the process direction, and continuously conveying the overlapped layers of sheet material strips in the set stacking order of the mask body forward; S2: Mask body strip folding step, folding the stacked mask body strip to form multiple folds on the mask body strip; S3: Nose clip adding step, adding the nose clip on the upper surface of the mask body strip, and then wrapping and folding the mask body; S4: Mask body strip sealing step, sealing at least on the side of the mask body strip to fix the nose clip, S5: Elastic lug adding step, conveying the elastic lug strip along the stretchable direction of the elastic lug, cutting the elastic lug strip to form the unique shape of the elastic lug and making a dotted cut at the connection of the left and right ear loops, and arranging the cut elastic lugs on the mask body strip and conveying them forward together with the mask body strip; S6: Elastic lug sealing step, sealing the elastic lugs arranged on the mask body strip with the mask body strip, so that each elastic lug on the elastic lug strip is joined to the mask body in a two-side combination manner; S7: Product cutting step, cutting the joined continuous strip to form independent products; In the mask body strip sealing step of step S4 and the elastic lug sealing step of step S6, ultrasonic welding devices are used for sealing. The ultrasonic welding device includes an ultrasonic vibration component, a pattern roller, a fine adjustment mechanism, and a driving mechanism. The fine adjustment mechanism is connected to the ultrasonic vibration component and can make a micro adjustment of the gap between the welding head and the pattern roller. The ultrasonic vibration component and the fine adjustment mechanism together form a moving component. The driving mechanism is connected to the moving component and is used to control the stroke between the welding head and the pattern roller on the moving component. The stroke path is the same as or opposite to the path of the fine adjustment mechanism for micro adjusting the gap; The driving mechanism has a substrate, a first slider connected to the moving component and capable of linear movement along the substrate, and a driving part; the fine adjustment mechanism includes a support plate connected to the first slider, a second slider connected to the ultrasonic vibration component and capable of linear movement along the support plate, a piezoelectric driver arranged on one side of the support plate, and a pressure sensor cooperating with the piezoelectric driver; a spring is also arranged on the other side of the support plate, and the spring can press the ultrasonic vibration component against the end face of the piezoelectric driver through the pressure sensor; The stroke range of the piezoelectric driver is 0.08 - 0.2 mm, and the maximum thrust range that can be output is 4000 - 8000 N; During the process of the welding head approaching the pattern roller, the piezoelectric sensor detects the reaction welding force of the pattern roller on the ultrasonic vibration assembly and compares it with the preset welding force. According to the comparison result, the piezoelectric actuator controls the welding head of the ultrasonic vibration assembly to approach or move away from the pattern roller. The piezoelectric actuator has a position adjustment accuracy at the sub-micron level and a response time at the millimeter level.

5. The manufacturing method of the flat mask according to claim 4, characterized in that: After the step S4, there is also a sheet turning process, which turns the sealed mask body strip so that the mask body strip is conveyed forward with the outer layer sheet on the upper side of each layer of sheets changed to the inner layer sheet on the upper side of each layer of sheets.

6. The manufacturing method of the flat mask according to claim 4, characterized in that: In the step S4 of sealing the mask body strip and the step S6 of sealing the elastic earpieces, both are achieved by heat sealing or ultrasonic welding.

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