CN112089133A - Personalized mask keeping face fit and construction method thereof - Google Patents

Abstract

The invention discloses a personalized mask keeping a face fit and a construction method thereof. The mask comprises a mask frame structure and mask cloth, wherein the mask frame structure comprises a frame edge, a middle reinforcing rib and a mask cloth pressing device; wherein the frame edge is designed according to facial features; the middle reinforcing rib is connected with the edge of the frame and is used for arching the cloth of the mask and supporting the structural strength of the edge of the frame; the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction; the mask cloth is arranged on the outer layer of the mask frame structure, and the edge of the mask cloth can be attached to the face of a wearer through the mask cloth pressing device when being folded inwards to the inner layer of the mask frame structure. The invention provides a fitting type mask which conforms to the shape of each human face region and has simple structure and easy production.

Description

Personalized mask keeping face fit and construction method thereof

Technical Field

The invention belongs to the field of three-dimensional geometric modeling and protection equipment manufacturing, relates to a mask structure and a design method thereof, and relates to the field of mask design and manufacturing.

Background

In public places such as hospital, epidemic areas, protective articles such as gauze mask often need to be worn, but protective articles such as present gauze mask, or be exactly multilayer non-woven fabrics cloth cover gauze mask, or adopt plastic type's such as silica gel face guard form, the former because face guard simple structure can't seal up people's face oronasal region completely, the latter cost is high and laminating face guard mainly is the deformation that adopts peripheral silica gel obtains, produces certain pressure deformation to the face, worn for a long time and produced facial discomfort easily.

Firstly, the composition and the structural form of the current multilayer cloth cover mask are analyzed:

disposable gauze mask of current use, for example medical surgery gauze mask or N95 gauze mask etc, the cloth cover is the three-layer non-woven fabrics, the inlayer is the soft close skin non-woven fabrics of laminating facial skin, the skin is the ash blocking waterproof layer, the centre is the filter layer in addition, be the melt-blown cloth through electret treatment, play the effect of adsorbing and keeping apart dust bacterium virus, the three-layer non-woven fabrics is made together, both sides are fixed belt of wearing in addition, a gauze mask needs multichannel process, the workshop space and the personnel that need are all more, generally can not full-automatic production. Although the process is also suitable for flow line production, the process is relatively complicated, the production efficiency of each production line is general, and the manufacturing cost is not low. For the disposable medical mask, the mask is produced in a workshop without bacteriostasis, or is sterilized in a sterilizing cabinet. At present, a soft iron wire is arranged at the nose bridge of a mask, the soft iron wire can be bent according to the shape of the nose to generate a mask shape suitable for facial features, the sealing protection at the mouth and the nose is enhanced, but according to the simulation of a cloth mask, the side face of the mask can not be completely attached to a facial area, therefore, in the breathing process of a person, a certain proportion of respiratory airflow enters an oral cavity and a nasal cavity from the side face of the face, the air does not pass through a filter layer, although the middle layer of the mask is an electret layer, the electrostatic coulomb force of the electret layer can be used for adsorbing and carrying a part of dust of virus and bacteria in the flowing process of the side air, according to the mechanical principle, the attractive force of the dust flowing from the side face to the mouth and the nose is larger than the electrostatic coulomb force of the electret layer, therefore, the dust can still enter the oral cavity or the nasal cavity along the flowing air, and a riding machine is left, therefore, the mask design and production which can be tightly attached to the face area are of great significance to emergency and public safety.

The utility model provides a special shape design that gauze mask that is fit for everyone and wears and can laminate individualized people face facial feature need carry out gauze mask edge profile according to everyone's facial shape, this is individualized customization facial shape type gauze mask of laminating in fact, and this kind of individualized design can't realize fast because the quantity of individualized facial number is huge. Therefore, the invention is an innovative point of designing a fitting type mask which can meet the requirements of large-scale production and is suitable for personalized facial features. Such masks need to satisfy the following conditions: (1) the method is suitable for large-scale production, and excessive manual operation is not needed for production; (2) the cost is low, and under the condition of a certain using amount, the cost of each mask is basically close to or slightly lower than that of the current medical mask; (3) is convenient for carrying.

There are a number of designs for face mask designs, but as can be seen from literature analysis, the face mask structure of this patent form has not been found in the literature.

Disclosure of Invention

The invention provides a mask frame structure design method which is applied to mask production, wherein the mask frame structure is separated from a mask filter cloth layer, the mask frame structure is attached to a human face through a mask contour structure and raised small blocks to obtain a personalized mask attaching structure, the mask frame structure can be reused, mask cloth does not need to be added with any additional structure and material, and the cloth production flow can be greatly simplified.

The above purpose can be realized by the following technical scheme:

the mask frame structure is separated from the mask cloth, so that the mask frame structure is attached to a human face more compactly, and meanwhile, the mask frame structure can be reused, and the mask cloth can be conveniently replaced and is also convenient to produce. The mask frame structure is divided into three parts: the frame edge, middle strengthening rib and protruding nut.

A frame edge structure, as shown in fig. 5, the frame structure is designed according to the face surface features, the design basis is to collect a three-dimensional face structure of a personal type, such as three-dimensional face features of a chinese person, select a median of the face features according to the face surface feature structure, obtain an on-plane line of the face surface including the mouth-nose area, use the on-plane line as a basic line, make an offset curve towards the normal direction of the face where the on-plane line is located, and the curve has the same shape as the basic line. The invention is characterized in that according to the structure of the face of a human face, an on-plane line of the face surface is constructed along the outer edge of a relatively flat area of the face around the mouth and nose, a directional offset is constructed by utilizing the on-plane line, a closed strip-shaped body is constructed by taking a directional offset curve as an axis, and the strip-shaped body is the edge structure of the mask frame. Can be divided into several sizes according to the face shapes of children and adults; a side view of the mask frame structure is shown in fig. 6.

Middle strengthening rib mainly plays the intensity that supports edge structure, and under the hangers rope that draws outward in both sides pulls, edge structure produces outside pulling force, obtains edge structure's shape through middle strengthening rib and keeps, can play the supporting role simultaneously, and the guarantee surface fabric leaves nose and oral cavity, forms the space in the middle of the face guard, ensures the circulation of air, as shown in fig. 3.

The raised nubs, as shown in FIG. 4, primarily provide a tight fit to the mask frame structure and face. The mask frame structure is only the main characteristic structure of the general public face, and for the facial structure of a part of people, the frame does not fit the face. The invention is mainly characterized in that a series of small protruding lugs which are arranged at intervals are arranged at the position of the edge strip-shaped structure towards the face, and the small protruding lugs can be arranged at intervals according to the curvature condition of the surface structure position of the face. In general, the protruding small blocks are equidistant from the edge strip-shaped structure, but the human face features have personalized features, so that everyone can revise the height of the protruding small blocks by himself. The protruding small T is movable and can be automatically inserted into a row of small holes in the edge structure, and the distance of each protruding small T can be adjusted according to facial features, so that a circle of protruding small T attached to the face is formed.

Another feature of the invention is a simple mask cloth creation. Combine above-mentioned facial frame construction still can not form the face guard, still need cover a layer of cloth surface course at the surface course outward, cover to face from the face guard outside, the cloth surface course at edge is rolled over to face guard edge structure inboard, and corresponding face guard production becomes fairly simple, as long as cut out according to certain length after compressing tightly the stack of multilayer non-woven fabrics. The length and the width of each mask cloth can be determined after a certain outer edge is properly extended according to the length of the longest reinforcing rib of the mask, so that the mask cloth is produced by multilayer plane cloth, can be produced in a manner similar to the rolling of preservative films, and can greatly reduce the production cost. When the mask is used, only one three-layer fabric is torn off and buckled on the mask frame structure from inside to outside, and the three-layer fabric is tightly pressed at the inner side of the edge. After the mask is used for a period of time, only the used cloth cover layer needs to be discarded to update the mask fabric, and for a heavily polluted area, a plurality of filter layers can be worn, so that the waste of the mask fabric is reduced. Simple operation and low price. The use cost of the mask is greatly reduced.

As for a common user, only one layer of electret meltblown fabric is needed, because of the adoption of the mask structure, the original skin-friendly inner-layer non-woven fabric can be omitted, and the outer waterproof layer can be omitted under many conditions, so that one layer or two layers of electret meltblown fabric can be used as mask fabric, the air permeability of the mask is improved, and the fabric cost is also saved.

The technical scheme of the invention is as follows:

a personalized mask for keeping a face fit is characterized by comprising a mask frame structure and mask cloth, wherein the mask frame structure comprises a frame edge, a middle reinforcing rib and a mask cloth pressing device; wherein the frame edge is designed according to facial features; the middle reinforcing rib is connected with the edge of the frame and is used for arching the cloth of the mask and supporting the structural strength of the edge of the frame; the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction; the mask cloth is arranged on the outer layer of the mask frame structure, and the edge of the mask cloth can be attached to the face of a wearer through the mask cloth pressing device when being folded inwards to the inner layer of the mask frame structure.

Furthermore, according to the facial feature structure, selecting a median of facial features, acquiring an upper surface line of the facial surface of the face including the oral-nasal region, taking the upper surface line as a basic line, making a directional offset curve towards the normal direction of the face at the position of the upper surface line of the facial surface, and taking the directional offset curve as an axis to construct a closed strip-shaped body which is the frame edge of the mask frame structure.

Furthermore, the mask cloth pressing device is a series of small protruding blocks which are vertically arranged along the face part at intervals; the edges of the mask fabric can be pressed by the raised nubs when folded inward toward the inner layer of the mask frame structure to conform to the wearer's face.

Further, the frame edge is normal to the face to the height of the face as the initial height of the protruding nub.

Furthermore, the height of the small raised blocks is adjustable, the height of the small raised blocks is determined according to the facial features of each person, and the height of the small raised blocks is adjusted by a user according to the fit degree of the face.

Furthermore, the mask cloth pressing device is a nylon pasting belt.

A method of constructing a personalized mask for maintaining facial fit, comprising the steps of:

1) preparing a frame edge of the mask frame structure based on the facial features;

2) the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction;

3) middle reinforcing ribs are arranged on two sides of the edge of the frame and are used for arching the cloth of the mask and supporting the structural strength of the edge of the frame;

4) when the mask is worn, the mask cloth is arranged on the outer layer of the mask frame structure, the edge of the mask cloth is folded inwards to the inner layer of the mask frame structure, and when a wearer wears the mask, the mask cloth is pressed to the face of the wearer by the mask cloth pressing device and is attached to the face of the wearer.

Further, the method for preparing the frame edge comprises the following steps: extracting a series of characteristic points around the mouth and the nose of the human face from the human face data of the target crowd; for the ith characteristic point, corresponding characteristic points extracted from each face data form a characteristic point cluster, the characteristic point cluster is represented by a 4-dimensional homogeneous space, then the characteristic point cluster is projected onto a three-dimensional hyperplane of the homogeneous space, a position histogram is constructed on the three-dimensional hyperplane according to the number of position point neighborhoods, then the midpoint of the position histogram is taken as a position point of a frame edge, and the position point is transformed into a three-dimensional Euclidean space; then, constructing an upper surface line of the surface of the human face according to the obtained position points; and taking the on-plane line as a basic line, making a directional offset curve towards the normal direction of the plane at the position of the on-plane line of the plane, taking a circular section by taking the directional offset curve as a motion path, and constructing a closed swept body, wherein the swept body is the edge of the frame.

Further, the extracted feature points comprise the highest point of the nose and nose bones of the human face, the lower edge points of the lowest points on the two sides of the nose and nose bones, the flat position point between the nose bridge and the cheekbone of the face, the flat points on the two side surfaces of the nose tip and the flat points on the two side surfaces outside the mouth corner.

Furthermore, the mask cloth pressing device is a series of small protruding blocks arranged at intervals; the edges of the mask fabric can be pressed by the raised nubs when folded inward toward the inner layer of the mask frame structure to conform to the wearer's face.

A method of constructing a personalized mask for maintaining facial fit, comprising the steps of:

1) preparing a frame edge of the mask frame structure based on the facial features; the mask frame structure adopts an umbrella-shaped structure, and the central axis of the umbrella-shaped structure is vertical or approximately vertical to the face;

2) the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction; one end point of each framework length of the umbrella-shaped structure is positioned at the central shaft, and the other end point is connected with the mask cloth pressing device;

3) when the mask is worn, the mask cloth is arranged on the outer layer of the mask frame structure, the edge of the mask cloth is folded inwards to the inner layer of the mask frame structure, and when a wearer wears the mask, the mask cloth is pressed to the face of the wearer by the mask cloth pressing device and is attached to the face of the wearer.

The main innovation points of the invention are three aspects:

the method for constructing the edge frame structure in the mask frame structure comprises the following steps: the purpose of the mask frame structure is to construct a personalized mask frame structure, the frame edges of which are required to conform to the facial features of a human face. The facial surface features of different ethnic groups have obvious difference, for example, the facial structure features of Asians and Western people have large difference, and even if the Asians and the southern people have large difference, the facial structure features of the southern people and the northern people also have large difference. We present here a general facial surface acquisition method. And performing feature registration on the human face geometric models by adopting a three-dimensional human face database or acquiring a sufficient number of three-dimensional human face geometric structures, such as selecting structural features of the three-dimensional human face models, such as mouth corners, nose, eye corners and the like. For the three-dimensional face structure, the structure of each person has certain differences, and the face and each organ have size and shape differences. Here, we can take the existing three-dimensional face database, such as the three-dimensional face structure database of CASIA 3D, obtain the clusters of these feature point clusters from these databases to get the representative feature points such as median, or in the distribution of each feature point, the feature point which obtains the most feature points in the neighborhood of the point set with any radius is taken (for example, a simple method is to project the three-dimensional feature points onto a hyperplane of a 4-dimensional space, a histogram of the distribution of the feature points is taken, the highest neighborhood median of the histogram is seen to be the feature point to be taken by the invention, if the highest histogram does not exist, the median of the feature points is taken as the value feature point), so that the facial feature point set is obtained, the method can be a three-dimensional face surface feature with most face features, and the face feature model is called a maximum face feature model. The facial upper line containing the mouth and the nose is obtained for the facial model of the human face, and the line contains the mouth and the nose and does not need to wrap the whole face, so that the waste of the fabric and the influence on the facial discomfort are avoided. As shown in fig. 1.

The variable offset shape construction method on the mask edge structure comprises the following steps: the mask edge structure is only that an on-plane line containing the mouth-nose periphery neighborhood is extracted from a standard three-dimensional human face facial feature model or a maximum facial feature model, and the on-plane line is taken as a path curve of a sweep curved surface, so that the mask edge structure with a pipe shape is formed, but the mask edge structure cannot realize an individualized model, and the produced mask frame structure cannot realize tight closure of the mask. The method of the invention is that the strip-shaped edge axis of the mask is taken along the normal direction of the face, the value is the height from the edge axis of the mask to the face along the normal direction of the face, the height is taken as the height of the small raised blocks, an arrangement of the small raised blocks with certain intervals is formed along the edge axis, the small raised blocks are the personalized shape characteristics of the mask, the distance arrangement of the taken values of each person is different, namely the heights of the small raised blocks at each position of each person's face are different. Thereby forming a mask frame structure with the protruding nubs as mask pressing locations, as shown in fig. 2.

The distribution intervals of the small T-shaped arrays can be determined according to the curvature distribution of the offset path curve, the small T-shaped arrays can be distributed in a slightly dense mode in the area with high curvature, the flat curvature positions are distributed at certain intervals, however, the small T-shaped arrays do not need to be distributed at the positions of the high positions of the nose bridge, and the mask can be attached to the nose bridge conveniently.

The mask fabric separation manufacturing method comprises the following steps: the mask frame structure of each person needs to be subjected to self-adaptive treatment on the height of the small raised blocks before wearing, so that the arrangement heights of the small raised blocks at different positions on the face are different. But as for the face mask fabric, all the face masks are made in the same way, as long as a plurality of layers of face masks are covered outside the face masks, the size of the face mask fabric is determined according to the length and width of the outer layer covering surface of the face mask, the shape is an inextensible curved surface, the face masks are not rectangular after being unfolded, but considering the processing and production convenience, the face masks can directly form a rectangular face fabric, after being covered on the face mask structure, the face masks can be directly folded inwards into the face mask structure, the beauty and the use are not influenced, the redundant part of the face fabrics are also subjected to electret treatment and can also be used as materials for adsorbing dust or viruses, the face fabrics are suitable for simple roll production, a sanitary roll paper form can be formed by performing certain dotted line-like half cutting at a certain length position of the rectangle, and when in use, only one face mask fabric is torn and folded on the outer layer, the edge of the fabric can be pressed by the bottom of the small protruding bead of the frame when being folded inwards, and then the folded inwards curled edge is attached to the inner layer of the frame.

Compared with the prior art, the invention has the following positive effects:

the current coronavirus epidemic situation is not completely inhibited, and new actual diagnosis disease cases are increased, which shows that certain potential safety hazards exist in the current safety protection measures, and the protection clothes equipped by each person cannot be guaranteed from the production of the protection clothes, and meanwhile, the method is not necessary. The current primary task is the tight protection of the oronasal part, so a fitting type mask which accords with the shape of each human face region needs to be designed as soon as possible, and meanwhile, the mask is suitable for the requirement of mass production and has a simple structure and is easy to produce.

Meanwhile, as the prevention and control of epidemic situations are a long-term and arduous task, a low-cost production line of the mask suitable for everyone to wear becomes an important production task with a national storage strategy, and the technical attack and the successful development of the production line of the project bring important demonstration to the production of high-quality low-cost masks in China.

Drawings

FIG. 1 is a schematic view of the attachment of a mask edge nub to the face;

FIG. 2 is a view of the overall frame structure of the mask;

FIG. 3 is a view of the mask configuration without raised nubs;

FIG. 4 is a structural shape diagram of a small raised dice;

FIG. 5 is a top view of the mask frame edge;

FIG. 6 is a side view of a mask frame structure;

FIG. 7 is a diagram of a method for selecting edge points of a mask;

figure 8 is a structural frame in the form of an umbrella structure for the mask.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

The mask structure and the fabric can be directly used for designing and producing the mask.

The manufacturing process of the mask comprises the following steps:

1) the edge structure shape of the frame of the mask is determined;

2) the shape of the small raised T-shaped mask is determined;

3) the shape of a reinforcing rib of the mask is determined;

4) determining the fabric of the mask;

5) the assembly integration of face guard gauze mask.

The specific implementation method comprises the following steps:

1) the frame edge structure shape of the mask is determined:

a) selecting a certain three-dimensional face database: for example, the CASIA 3D face database, or the actual collection of three-dimensional faces for some people, considering the manufacturing cost, and the face shape structure depends more on the face structure characteristics of a certain race, so the existing three-dimensional face data of a certain race is selected. As an example of the present invention, a three-dimensional face database of a Chinese may be selected as the base face data; selecting face characteristic points: unlike the human face feature points of face recognition, the feature points selected by the present invention are a series of points located around the mouth and nose of the human face, such as a white-point array shown in fig. 7 (an isolated point array in the figure, not a point array with connecting lines). These points constitute the points of location of the mask frame edges. Such selection of points has the following benefits: the main characteristic points of normal face recognition are not influenced, certain recognition conditions are provided for the face recognition, and the manual recognition of the face is not influenced, namely, the degree of shielding the face by the face mask is lower.

b) The method for selecting the edge points of the human face comprises the following steps: aiming at the peripheral area of the mouth and nose of the human face, three points of the highest point of the nose bone of the nose of the human face and the lower edges of the two lowest points at the two sides of the nose are selected, a flat position point between the nose bridge of the face and the cheekbone is selected, flat points at the two side parts of the nose tip are selected, and flat points at the two side parts outside the mouth corner are selected, namely the minimum point of curvature in the extension direction of the. The position of the highest point of the chin at the bottom of the face is selected instead of the groove between the chin and the lower lip, so that the mask is beneficial to opening and closing the mouth to speak after covering the mouth, and at the moment, the mask moves upwards to buckle the groove of the chin due to the action of opening the mouth, and air leakage on the side face of the mask cannot be generated.

c) And selecting the same point sequence in each three-dimensional face database by taking the characteristic point sequence as a reference, wherein each characteristic point of the point sequences forms a characteristic point cluster of the characteristic point for all faces in the face database. The invention provides a typical characteristic point taking method in a cluster: the point clusters are represented by a four-dimensional homogeneous space, the point clusters are projected onto a three-dimensional hyperplane, a position histogram is constructed on the hyperplane by the points, namely the histogram is constructed according to the number of neighborhood of the position points, the histogram shows the density of the point clusters at adjacent positions, the highest column of the histogram is the position point region with the most density of the point clusters, and the midpoint of the position histogram is the typical characteristic point required to be acquired. In an extreme case, the clusters are uniformly distributed, and only the median or the median is required. According to the method, each feature point cluster is subjected to typical feature point selection according to the method to obtain a typical feature point column, and the typical feature point column is a typical human face surface three-dimensional feature point column to be selected by the invention. And constructing an on-plane line of the face surface based on the typical feature point columns, wherein the on-plane line is called a typical on-plane line.

d) Sampling point columns are taken by taking a typical on-plane line as a reference, the offset (offset) of a fixed distance of the point columns is made along the normal direction of the surface of the face, the distance can be selected to be about 1-2cm, and the offset point columns are connected to form a smooth offset curve. In consideration of the curved regions such as the nose bridge of the human face and the like, the deviation of the normal direction of the face vertical to the human face can form an automatic deviation curve, so that a simple method is to directly obtain the parallel normal direction vertical to the whole face and make an equidistant deviation distance along the whole normal direction to form a deviation curve, and the deviation curve is a curve formed by connecting face sampling points. Taking the offset curve as a motion path, taking a circular section with the section radius of 1-2cm, and constructing a closed swept body (sweep), wherein the swept body is a required mask frame edge shaft, and the mask frame edge shaft is constructed.

2) The shape of the protruding nub on the mask frame edge shaft determines: mask frame edge axes determined in this way do not conform perfectly to the facial surface of each person because each person's facial surface is shaped differently and cannot be fitted with a typical frame edge axis. How to adapt to the face surface of each person is another innovation point of the invention, namely, the typical edge frame moves a fixed distance along the normal direction of the face surface, the distance is the height of the small raised blocks, the small raised blocks are inserted into the small holes of the edge frame, a user can determine the height of the small raised blocks by combining the edge axis of the frame and the height of the face of the user, the small raised blocks are made of silica gel, and the user can freely cut the height, so that the arrangement height of the small raised blocks suitable for the height of the face of the user is obtained.

3) The shape of the reinforcing ribs of the mask is determined: the effect of strengthening rib is the hunch-up surface fabric, forms the breathing cavity of mouth nose, another effect is the intensity that improves face guard frame edge axle, because this edge axle can be along facial stretching to ear department wearing the in-process, in order to conveniently fix on facial, consequently this pulling force forms outside pulling force to face guard edge axle, if not certain back pulling force, edge axle can produce deformation, not only inconvenient original shape of keeping forms effectual cover, also do not do benefit to structure safety moreover. By installing the reinforcing ribs on the two sides of the edge shaft, the back tension can be formed, and the structural stability of the edge shaft is kept. The number of the reinforcing ribs can be changed properly, and the height of the reinforcing ribs can be adjusted properly, so long as the portable carrying is facilitated. One approach is to have the stiffener bend height similar to the edge shaft bend height, which facilitates folding portability. The folding type mask is characterized in that the edge shaft is provided with a movable rotating shaft at the high position of the nose bridge, one of the positions at two sides of the mouth corner can be provided with the rotating shaft, the other can be detached, so that the edge shaft can be divided into three parts, the flat structure is formed after the rotation is folded, and the reinforcing ribs can be movably detached, so that the whole mask structure can be folded when not used, and the mask is convenient to carry. The mask structure is not disposable and can be reused until damaged.

4) Determining the fabric of the mask: the face mask fabric can be made of one or more layers of electret melt-blown cloth, and an outer waterproof layer can be eliminated under general conditions and is only needed in rainy days or when being worn by doctors.

5) The assembly integration of face guard gauze mask. When the mask is worn, the two sides of the reinforcing ribs of the mask are respectively tied with a worn string so as to be conveniently hung at the ears and also hung on the head bag, and various wearing modes are similar to those of a common mask. When the mask is used for the first time, the height of each protruding small T needs to be adjusted by combining the face shape of each person, and the heights of the plurality of small T on the edge shaft of each mask structure can be adjusted, so that the small T can be attached to the face of the person when the mask is suitable for being worn by the person. At the moment, a piece of mask cloth cover is torn off and covered on the mask frame, the edge is pressed inwards towards the inner side of the mask shaft, meanwhile, a hanging rope in the mask is hung at the position of an ear, and the mask is firmly attached to the face.

According to the requirements, the mask is divided into two parts, namely a mask edge outline and a mask, wherein the mask edge outline is formed by pressing a die with a specific shape by adopting safe plastics, and the bottom layer of the mask edge outline close to the face is also provided with silica gel crown T-shaped heads which are closely arranged, so that the shape change of the height adjustment can be carried out, the change of the face shape can be adapted, and the mask edge outline with the characteristic shape of an individualized face area can be formed.

It should be noted that the invention of the edge profile structure can be extended to a plurality of forms, one form is that the edge profile is made into an umbrella-shaped structure, when the umbrella is unfolded, the root of the umbrella is above the nose, the position of the root of the umbrella to the edge shaft of the frame is kept basically the same as much as possible, but not necessarily the same, the length of the umbrella frame is required to be in accordance with the position of the edge shaft of the frame, and the shape of the umbrella is protruded outwards. The small T can be installed at the end point of the umbrella frame, all the frameworks of the umbrella are connected by thin wires, and when the umbrella is unfolded, the thin wires can tighten the frameworks of the umbrella to form an umbrella-shaped framework. It looks like a small umbrella over the mouth and nose. The design mainly considers that the frame is convenient to be stored and carried about, and when the umbrella is not used, the framework of the umbrella can be folded like an umbrella.

Example 1

Several major steps in constructing a mask production line:

1) the mask contour mold simulation optimization design comprises the steps of performing stress optimization calculation on the edge contour shape, generating the edge contour strip shape through the mold shape, forming the edge contour strip shape through stamping and other forms, and enabling the mask contour and the middle reinforcing ribs to be separated to form mold parts for production respectively and then forming an assembled mask frame;

2) designing the production of the similar protruding T-shaped connecting buckle, and taking a value d according to the determined distance and the maximum value of the feature point set of the median on the surface of the human facial database, thereby forming a protruding small T-shaped cluster with the height of d. In the area of the position of the annular shaft facing the face of the mask contour, a small hole with certain gap and cross is formed, so that the root of the small bulge can be conveniently inserted into the small hole;

3) on the edge of the outline, combining with personalized facial features, the cutting length of the T-shaped connecting buckle in the shape of the small raised T is obtained by the user wearing trial measurement, so that the edge outline formed by the attached small raised T-shaped clusters can be generated;

4) in the using process of a user, the length of the T-shaped head is properly cut according to the facial features of the user, so that the face can not be abraded, and a tight face mask edge is formed, so that a personalized face mask corresponding to various facial regions is formed, for facial activities during speaking, as the small protruding parts are close to the face and have a certain concave circular structure and are similar to a spherical crown, a silica gel material is adopted, and certain elasticity is achieved, so that a certain elastic edge is formed under the action of the material and the spherical crown structure, and the tight fit between the face mask and the face can still be kept;

the mask is suitable for flow line production: the mask frame suitable for each common human face feature can be produced through a die, and is low in cost for mass production. For the mask face guard part, a production line similar to toilet paper or a preservative film can be adopted to generate a roll shape of the mask face guard, when the mask face guard is used, only an outer waterproof layer and a middle filtering electret melt-blown cloth layer are needed to be torn off, or a plurality of filter layers are directly used, the outer side of the overlapped mask contour is covered, the mask is inwards attached and fastened to form the mask, the attachment safety is ensured, and meanwhile, the filter layers can be replaced to obtain safe filtered air.

Example 2:

the invention also proposes another structural form for the mask structural frame, namely the structural frame is constructed in an umbrella-shaped structural form, as shown in fig. 8. The umbrella-shaped central shaft is close to a vertical face part and is approximately positioned at the upper part of the tip of the nose, the central shaft is the highest part of the frame of the umbrella-shaped structure, when the umbrella-shaped frameworks are folded, the central shaft extends outwards and is opposite to the folding direction of the central shaft of a common umbrella, one end point of each framework length of the umbrella-shaped structure is positioned at the central shaft, the other end point is positioned at the edge position of the frame structure, the lengths of each framework of the umbrella-shaped structure are different, and the lengths from the umbrella-shaped central shaft to the end points of each framework are considered, the approximate similarity between the lengths of the umbrella-shaped frameworks can be obtained by adjusting the positions of the central shafts, the end points of the umbrella-shaped frameworks are connected with the small protruding lugs, and the small lugs can be adjusted in a swinging mode at the end points of the umbrella. The umbrella-shaped frameworks are relatively evenly distributed at the strips of the framework structure to cover the peripheral area of the mouth and the nose of the face, and the umbrella-shaped frameworks are connected by flexible wires, and the other end of the frameworks is an umbrella-shaped retracting shaft which is similar to the common umbrella structure. A flexible wire is led out through the umbrella-shaped central shaft near the mouth and nose end and is forked to two sides near the mouth and nose, and the flexible wire is used as a wearing flexible wire. When the mask is folded, a small umbrella is similarly folded, and the mask can be hung in front of the chest to be conveniently carried.

Other parts, such as the design of the protruding small blocks and the structure of the mask cloth, are the same as those of embodiment 1.

The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and a person skilled in the art can modify the technical solution of the present invention or substitute the same without departing from the spirit and scope of the present invention, and the scope of the present invention should be determined by the claims.

Claims (11)

1. A personalized mask for keeping a face fit is characterized by comprising a mask frame structure and mask cloth, wherein the mask frame structure comprises a frame edge, a middle reinforcing rib and a mask cloth pressing device; wherein the frame edge is designed according to facial features; the middle reinforcing rib is connected with the edge of the frame and is used for arching the cloth of the mask and supporting the structural strength of the edge of the frame; the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction; the mask cloth is arranged on the outer layer of the mask frame structure, and the edge of the mask cloth can be attached to the face of a wearer through the mask cloth pressing device when being folded inwards to the inner layer of the mask frame structure.

2. The personalized mask according to claim 1, wherein a median of facial features is selected based on the facial feature structure, an on-plane line of the facial surface of the face including the oronasal region is obtained, the on-plane line is used as a base line, a directional offset curve is made towards the normal direction of the face where the on-plane line of the face is located, and a closed strip is constructed by using the directional offset curve as an axis, wherein the strip is a frame edge of the mask frame structure.

3. The personalized mask of claim 1, wherein the mask cloth hold down means is a series of raised nubs vertically spaced along the face; the edges of the mask fabric can be pressed by the raised nubs when folded inward toward the inner layer of the mask frame structure to conform to the wearer's face.

4. The personalized mask of claim 3, wherein the frame edge is normal to the face to the height of the face along the face as the initial height of the raised nub.

5. The personalized mask of claim 3 or 4, wherein the raised nubs are height adjustable, the height of adjustment being determined by each person's facial features, the user adjusting according to the fit of the face.

6. The personalized mask of claim 1, wherein the mask cloth hold-down device is a nylon adhesive tape.

7. A method of constructing a personalized mask for maintaining facial fit, comprising the steps of:

1) preparing a frame edge of the mask frame structure based on the facial features;

2) the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction;

3) middle reinforcing ribs are arranged on two sides of the edge of the frame and are used for arching the cloth of the mask and supporting the structural strength of the edge of the frame;

4) when the mask is worn, the mask cloth is arranged on the outer layer of the mask frame structure, the edge of the mask cloth is folded inwards to the inner layer of the mask frame structure, and when a wearer wears the mask, the mask cloth is pressed to the face of the wearer by the mask cloth pressing device and is attached to the face of the wearer.

8. The method of claim 7, wherein the frame edge is prepared by: extracting a series of characteristic points around the mouth and the nose of the human face from the human face data of the target crowd; for the ith characteristic point, corresponding characteristic points extracted from each face data form a characteristic point cluster, the characteristic point cluster is represented by a 4-dimensional homogeneous space, then the characteristic point cluster is projected onto a three-dimensional hyperplane of the homogeneous space, a position histogram is constructed on the three-dimensional hyperplane according to the number of position point neighborhoods, then the midpoint of the position histogram is taken as a position point of a frame edge, and the position point is transformed into a three-dimensional Euclidean space; then, constructing an upper surface line of the surface of the human face according to the obtained position points; and taking the on-plane line as a basic line, making a directional offset curve towards the normal direction of the plane at the position of the on-plane line of the plane, taking a circular section by taking the directional offset curve as a motion path, and constructing a closed swept body, wherein the swept body is the edge of the frame.

9. The method of claim 8, wherein the extracted feature points comprise the highest point of the nose-nose bone of the human face, the lowest point lower edge points of the two sides of the nose-nose bone, the middle flat position point of the nose bridge and the cheekbones of the face, the flat points of the two sides of the nose tip and the flat points of the two sides of the outer side of the mouth corner.

10. The method of claim 7, wherein the mask cloth hold-down device is a series of spaced raised nubs; the edges of the mask fabric can be pressed by the raised nubs when folded inward toward the inner layer of the mask frame structure to conform to the wearer's face.

11. A method of constructing a personalized mask for maintaining facial fit, comprising the steps of:

1) preparing a frame edge of the mask frame structure based on the facial features; the mask frame structure adopts an umbrella-shaped structure, and the central axis of the umbrella-shaped structure is vertical or approximately vertical to the face;

2) the mask cloth pressing device is arranged at the position of the edge of the frame facing to the face direction; one end point of each framework length of the umbrella-shaped structure is positioned at the central shaft, and the other end point is connected with the mask cloth pressing device;

3) when the mask is worn, the mask cloth is arranged on the outer layer of the mask frame structure, the edge of the mask cloth is folded inwards to the inner layer of the mask frame structure, and when a wearer wears the mask, the mask cloth is pressed to the face of the wearer by the mask cloth pressing device and is attached to the face of the wearer.

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