TWM609782U - Support type mask - Google Patents

Abstract

This creation is a support mask, which includes a cover body and two support bars; among them, the cover body includes a top edge and a bottom edge that are positioned opposite each other, as well as the first fold, the second fold and the third fold. The first fold is close The top edge of the mask body, the third fold is close to the bottom edge of the mask body, and the second fold is located between the first fold and the third fold; the two support bars are spaced apart on the second fold; the support mask of this creation has two The distance between the support strips is short, which can provide sufficient support for the mask body, which can solve the problem of the existing masks. The distance between the support strips and the support strips is too large, which causes the mask body to sag toward the wearer’s face. When wearing, it can keep the appearance of the mask flat and prevent the cover of the mask from being sunken and contacting the wearer's mouth.

Description

Supporting mask

This creation relates to a mask, especially a supporting mask that can keep the appearance of the mask flat when worn, and prevent the cover of the mask from being sunken and contacting the wearer's mouth.

A mask is a kind of wearing equipment in which a water-absorbing layer, a waterproof layer and a filter layer are used to form a cover, and the filter layer arranged between the water-absorbing layer and the waterproof layer is used to filter particles in the air. In recent years, due to the extensive use of petrochemical energy, air quality has gradually declined, making people wear masks when commuting or exercising outdoors to reduce the adverse effects of airborne particles on the respiratory system.

In order to increase the comfort of wearing masks, manufacturers of masks have added support bars to the mask body of the mask to support the mask body and prevent the mask body from sticking to the wearer’s mouth and nose. The uncomfortable.

At the end of 2019 and after the outbreak of the new crown pneumonia, the new crown virus (COVID-19) that can be transmitted in the air caused everyone to endanger themselves, and masks have become a daily necessity for people to ensure their lives. Before the epidemic has subsided, people need to wear masks not only outdoors, but also indoors to prevent the spread of the virus.

As people wear masks for more time, masks have gradually changed from purely functional equipment to decorative accessories, and people's requirements for the appearance of masks have gradually increased. Although the existing masks have additional support bars on the mask body for support, the two support bars are installed at different folds of the mask, or the distance between the support bars and the support bars is too large. When worn on the wearer, the cover body between the two support bars may easily collapse, which affects the appearance of the mask when worn on the wearer. In particular, when the wearer speaks while wearing a mask, the depression of the mask body will open and close as the wearer speaks; therefore, the existing mask still has an improvement in the design of the position of the support bar. And progress.

In order to solve the problem of the existing mask, the distance between the support bar and the support bar is too large to provide sufficient support for the mask, resulting in the problem that the cover of the mask is easily dented toward the wearer's face. This creation provides a support type mask. At least two support bars are arranged on the second fold of the mask support cover body, which can shorten the distance between the support bars and achieve the purpose of opening the mask body and preventing the mask body from sinking toward the wearer’s face. .

The supporting mask proposed in this creation to solve technical problems includes: A cover, the cover includes a top edge and a bottom edge opposite to each other, two opposite sides, and a first fold, a second fold and a third fold, the first fold is close to the cover The top edge of the body, the third fold is close to the bottom edge of the cover, and the second fold is located between the first fold and the third fold; and There are at least two support bars, each of which is elongated and flexible, the at least two support bars are arranged at intervals and extend toward both sides of the cover, and the at least two support bars are arranged on the second fold.

In the supporting mask, the at least two supporting bars are two supporting bars, and the outer sides of the two supporting bars are separated by a distance, and the distance is in the range of 2.3 to 2.7 cm.

In the support mask, the outer side of a support bar near the top edge of the cover is separated from the top edge by a distance, and the distance ranges from 2.6 to 3.0 cm.

In the support mask, the first fold includes an outer sheet, an inner sheet, and a bent portion connecting the outer sheet and the inner sheet of the first fold; the second The fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the second folded outer layer sheet body and the inner layer sheet body, the second folded outer layer sheet body and the first folded inner layer The sheet bodies are connected in a bent manner so that the first folded inner layer sheet body is interposed between the first folded outer layer sheet body and the second folded outer layer sheet body; the at least two supporting strips are two supporting strips , Two support bars are provided on the second folded outer layer sheet body, one of the support bars is adjacent to the bending connection between the second folded outer layer sheet body and the first folded inner layer sheet body; the other The bending part of the support bar is adjacent to the second bend.

The support type mask, wherein the cover includes a water-absorbing layer, a waterproof layer, and a filter layer between the water-absorbing layer and the waterproof layer; the two supporting strips are between the waterproof layer and the waterproof layer. Between the filter layers.

In the support mask, the third fold includes an outer sheet, an inner sheet, and a bent portion connecting the outer sheet and the inner sheet of the third fold. The folded outer layer sheet body and the second folded inner layer sheet body are connected in a bending manner, so that the second folded inner layer sheet body is interposed between the second folded outer layer sheet body and the third folded outer layer sheet The support type mask further includes an auxiliary support bar, the auxiliary support bar is elongated, flexible, and extends toward both sides of the cover, the auxiliary support bar is directly attached to the The water-absorbing layer is adjacent to the bending joint of the outer sheet body of the third fold.

In the support type mask, the water absorption layer, the waterproof layer and the filter layer are thermally welded to the support bars.

In the support mask, the first fold includes an outer sheet, an inner sheet, and a bent portion connecting the outer sheet and the inner sheet of the first fold; the second The fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the second folded outer layer sheet body and the inner layer sheet body, the second folded outer layer sheet body and the first folded inner layer The sheet bodies are connected in a bent manner so that the first folded inner layer sheet body is interposed between the first folded outer layer sheet body and the second folded outer layer sheet body; the at least two supporting strips are two supporting strips , Two support bars are provided on the second folded outer layer sheet body, one of the support bars is adjacent to the bending connection between the second folded outer layer sheet body and the first folded inner layer sheet body; the other The bending part of the support bar is adjacent to the second bend.

In the support mask, the third fold includes an outer sheet, an inner sheet, and a bent portion connecting the outer sheet and the inner sheet of the third fold. The folded outer layer sheet body and the second folded inner layer sheet body are connected in a bending manner, so that the second folded inner layer sheet body is interposed between the second folded outer layer sheet body and the third folded outer layer sheet The supporting mask further includes an auxiliary support bar, the auxiliary support bar is elongated, flexible, and extends toward both sides of the mask body, the auxiliary support bar is adjacent to the third fold The bending joint of the outer sheet body.

In the support mask, the first fold includes an outer sheet, an inner sheet, and a bent portion connecting the outer sheet and the inner sheet of the first fold; the second The fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the second folded outer layer sheet body and the inner layer sheet body, the second folded outer layer sheet body and the first folded inner layer The sheet bodies are connected in a bent manner so that the first folded inner layer sheet body is interposed between the first folded outer layer sheet body and the second folded outer layer sheet body; the third fold includes an outer layer sheet body, An inner layer sheet body, and a bending portion connecting the third folded outer layer sheet body and the inner layer sheet body, the third folded outer layer sheet body and the second folded inner layer sheet body are bent and connected , So that the second folded inner layer sheet body is between the second folded outer layer sheet body and the third folded outer layer sheet body; the at least two supporting strips are three supporting strips, one of which is the supporting strip Set at the second-folded outer sheet body and adjacent to the bending connection between the second-folded outer layer sheet body and the first-folded inner layer sheet body, and another support bar is provided on the second-folded outer layer sheet Body and adjacent to the second folded part, the remaining one of the support bars is arranged on the second folded inner layer sheet body and is adjacent to the second folded inner layer sheet body and the third folded outer layer sheet body的flexion joints.

The efficiency gains obtained by the technical means of this creation are: 1. The support type mask of this creation has two support bars set on the second fold of the cover body, and the distance between the two support bars is short, so that the part of the cover body located between the two support bars can be fully supported and supported. Open, and not easy to dent. When the wearer speaks while wearing the support mask created by this invention, the part of the cover located between the two support bars is not easy to dent toward the wearer's face, but can present a flat appearance. 2. The two support bars of this creation are both located on the outer sheet of the second fold. Compared with the existing masks where the two support bars are respectively arranged on the two folds, there is no bending structure between the two support bars in this creation, which can further This ensures that the second-folded outer sheet body can present a flat appearance when worn. 3. This creation can also add a third support bar to the second fold of the cover or add an auxiliary support bar to the third fold; when wearing, the position of the first support bar corresponds to between the lower edge of the wearer’s nose and the upper lip , The position of the second support bar is correspondingly located between the upper and lower lips of the wearer, and the position of the third support bar or auxiliary support bar is correspondingly located between the lower lip and the chin of the wearer, further increasing the support The strength of the second fold of the cover makes the second fold more upright.

In order to understand the technical features and practical effects of this creation in detail, and to implement it in accordance with the new content, the preferred embodiment shown in the figure is further described in detail as follows:

As shown in FIG. 1, the supporting mask of the first preferred embodiment of the present creation includes a mask body 10, a nose bridge 20, two supporting bars 30 and two hanging ears 40.

As shown in FIG. 1, the cover body 10 has a rectangular shape with a top edge 101, a bottom edge 102 and two side edges 103. As shown in FIG. 2, the cover 10 is made by laminating a water-absorbing layer 104, a waterproof layer 105, and a filter layer 106, and then thermally pressing the water-absorbing layer 104, the waterproof layer 105, and the filter layer 106. The filter layer 106 is between the water-absorbing layer 104 and the waterproof layer 105, and the nose bridge 20 and the two supporting bars 30 are both between the waterproof layer 105 and the filter layer 106. In application, the nose bridge strip 20 and the two supporting strips 30 can also be interposed between the water-absorbing layer 104 and the filter layer 106. Alternatively, the nose bridge strip 20 and the two supporting strips 30 can also be provided on the water-absorbing layer 104 or even the outer surface of the waterproof layer 105.

In the first preferred embodiment of the present invention, the two sides 103 of the cover body 10 are thermally pressed to constrain the nose bridge 20 and the two support bars 30 between the two sides 103. In application, as shown in FIG. 4, it is also possible to perform thermal compression bonding along the nose bridge 20 or the two support bars 30, so that the water-absorbing layer 104, the waterproof layer 105 and the filter layer 106 can be directly pressed together. In combination with the nose bridge 20 or the two support bars 30, in addition to the same can restrict the nose bridge 20 and the two support bars 30 between the two sides 103 of the shell 10, the water-absorbing layer 104 and the waterproof layer 105 Directly combining the nose bridge strip 20 or the two support strips 30 with the filter layer 106 can avoid the original creation of the wearer. When the wearer inhales, the water-absorbing layer 104, the waterproof layer 105 or the filter The situation where the layer 106 alone is sucked up occurs.

As shown in Figures 1 and 3, the cover 10 includes three folds, each of which includes an outer sheet, an inner sheet, and a bending portion connecting the outer sheet and the inner sheet.

As shown in Figure 3, the three folds are a first fold 11, a second fold 12, and a third fold 13; wherein, the first fold 11 is close to the top edge 101 of the cover 10, and the third fold 13 is close to the bottom edge 102 of the cover body 10, and the second fold 12 is located between the first fold 11 and the third fold 13.

The outer sheet body 111 and the inner sheet body 112 of the first fold 11 are connected by the bending portion 113 of the first fold 11; the outer sheet body 121 and the inner layer sheet body 122 of the second fold 12 are connected by the The bending portion 123 of the second fold 12 is connected, and the outer sheet body 121 of the second fold 12 is bent and connected to the inner layer sheet 112 of the first fold 11, so that the inner layer sheet of the first fold 11 The body 112 is located between the outer sheet body 111 of the first fold 11 and the outer sheet body 121 of the second fold 12; the outer sheet body 131 and the inner layer sheet body 132 of the third fold 13 are formed by the third fold The bending portion 133 of the 13 is connected, and the outer sheet 131 of the third fold 13 and the inner sheet 122 of the second fold 12 are connected in a bending manner.

As shown in FIG. 1, the nose bridge strip 20 is elongated, flexible, adjacent to the top edge 101 of the mask body 10, and extends toward the two sides 103 of the mask body 10.

As shown in FIGS. 1 and 3, the two supporting bars 30 are also elongated and flexible, and the two supporting bars 30 are parallel and are arranged on the outer sheet 121 of the second fold 12; as shown in FIG. The wearer can bend the two flexible support bars 30 to form a space S between the cover 10 and the wearer's face. Furthermore, the wearer can also adjust the degree of bending of the two flexible support bars 30 and expand the space S to ensure that the wearer can breathe smoothly.

In FIG. 3, a support strip 30 adjacent to the bending connection of the outer layer sheet body 121 of the second fold 12 and the inner layer sheet body 112 of the first fold 11 is defined as the first support strip 30A. The outer side 301A of a support bar 30A is adjacent to the bending connection between the outer sheet body 121 of the second fold 12 and the inner sheet body 112 of the first fold 11; it will be adjacent to the bending portion 123 of the second fold 12 One of the supporting bars 30 is defined as a second supporting bar 30B, and the outer side 301B of the second supporting bar 30B is adjacent to the bending portion 123 of the second fold 12. Specifically, the top edge 101 of the cover 10 is separated from the outer side 301A of the first support bar 30A by a distance, and the distance is in the range of 2.6 to 3.0 cm. Preferably, the distance is 2.8 cm; The outer side 301A of a support bar 30A and the outer side 301B of the second support bar 30B are separated by a gap G, the gap G ranges from 2.3 to 2.7 cm, preferably, the gap G is 2.5 cm.

In the first preferred embodiment of the present invention, the nose bridge 20, the first supporting bar 30A, or the second supporting bar 30B are respectively made of a metal wire covered with a plastic material, and thus have flexibility.

As shown in FIG. 1, the two hanging ears 40 are respectively arranged on the two sides 103 of the cover body 10, and the two hanging ears 40 are used to be sleeved on both ears of a wearer.

As shown in Figures 5 and 6, when the support mask of the present creation is worn on the wearer, the nose bridge 20 is positioned at the nose bridge of the wearer, and the wearer can bend the nose bridge 20, except for making The nose bridge 20 is curved along the nose bridge of the wearer, thereby limiting the position of the mask body 10. The nose bridge 20 is attached to the wearer's face, isolates the external environment, and avoids air particles and dust. The mites or viruses enter the cover 10 from the top edge 101 of the cover 10 and are inhaled by the wearer.

In particular, in the first preferred embodiment of the present creation, the first support bar 30A and the second support bar 30B are both provided in the same fold of the cover body 10, and the first support bar 30A and the second support bar 30A are The distance between the bars 30B is short, so that the part of the cover body 10 located between the first support bar 30A and the second support bar 30B can be fully supported to be stretched and not easily dented. When the wearer speaks while wearing the support mask created by this invention, the part of the cover body 10 located between the first support bar 30A and the second support bar 30B is not easy to dent toward the wearer’s face, but can Presents a flat appearance.

In addition, the first support bar 30A and the second support bar 30B are both provided on the second fold 12 of the cover body 10. The position of the first support bar 30A corresponds to the lower edge of the wearer’s nose and the upper lip. In between, the position of the second support bar 30B is correspondingly located between the upper and lower lips of the wearer, so that the cover 10 supported by the first support bar 30A and the second support bar 30B will not be attached For the lips of the wearer, it is possible to prevent the wearer's mouth foam or lipstick and other cosmetics from adhering to the cover body 10, maintaining hygiene in use and prolonging the use time of the mask.

Finally, the first support strip 30A of the present creation is adjacent to the bending connection between the outer sheet body 121 of the second fold 12 and the inner layer sheet 112 of the first fold 11, and the second support strip 30B is adjacent to the first fold 11 The bent portion 123 of the two-fold 12; in other words, the first support bar 30A and the second support bar 30B are both located on the outer sheet body 121 that is in a flat sheet shape. Compared with the existing masks that have two support bars arranged in two folds, there is no bending structure between the first support bar 30A and the second support bar 30B of this creation, which makes it more difficult for the wearer to breathe and exhale. It can further ensure that the outer layer sheet 121 can maintain a flat appearance when worn.

As shown in Figures 7 and 8, the second preferred embodiment of this creation is substantially the same as the first preferred embodiment. The difference between the second preferred embodiment and the first preferred embodiment is that in the second preferred embodiment In the embodiment, a third support bar 30C is added to the second fold 12 of the cover body 10; in the second preferred embodiment, the first support bar 30A and the second support bar 30B are also provided on the first support bar 30C. The outer sheet 121 of the second fold 12 is formed, and the third supporting strip 30C is disposed on the inner sheet 122 of the second fold 12. As in the first preferred embodiment, the first support bar 30A is adjacent to the bending connection between the outer sheet body 121 of the second fold 12 and the inner layer sheet body 112 of the first fold 11. The second support bar 30B Adjacent to the bending portion 123 of the second fold 12; in the second preferred embodiment, the third support bar 30C is adjacent to the inner sheet body 122 of the second fold 12 and the outer sheet body 131 of the third fold 13的flexion joints.

As shown in FIGS. 7 and 8, the third support bar 30C added in the second preferred embodiment of the present creation is also provided on the second fold 12 of the cover 10. The position of the first support bar 30A corresponds to the lower edge of the wearer’s nose and the upper lip, and the position of the second support bar 30B corresponds to the position between the upper and lower lips of the wearer. The position of the third support bar 30C The position is correspondingly located between the lower lip and the chin of the wearer, which further increases the strength of supporting the second fold 12. In the second preferred embodiment of the present creation, the first fold of the cover 10 is The two-fold 12 is more rigid. In application, the third support strip 30C can also be disposed on the inner sheet body 122 of the second fold 12 and is also adjacent to the bending portion 123 of the second fold 12, and also between the waterproof layer 105 and the filter layer Between 106.

As shown in FIG. 9 in the third preferred embodiment of the present creation, the third preferred embodiment is substantially the same as the second preferred embodiment, and the difference between the two is: in the third preferred embodiment, the present creation is omitted In the second preferred embodiment, the third support strip 30C is added at the bending connection between the inner sheet body 122 of the second fold 12 and the outer sheet body 131 of the third fold 13. In the third preferred embodiment, an auxiliary support bar 50 is added to the outer sheet body 131 of the third fold 13, and the auxiliary support bar 50 is also elongated and flexible. The first support bar 30A and the second support bar 30B are parallel and extend toward the two sides 103 of the cover body 10. The auxiliary support bar 50 is directly attached to the water-absorbing layer 104 and is adjacent to the outer layer sheet of the third fold 13 The bending joint of the body 131. In addition to being directly attached to the water-absorbing layer 104, the auxiliary support bar 50 can also be arranged between the waterproof layer 105 and the filter layer 106 like the support bar 30 in the first preferred embodiment.

The above are only preferred embodiments of this creation, and do not impose any formal restrictions on this creation. Any person with ordinary knowledge in the relevant technical field can use this creation without departing from the scope of the technical solution proposed in this creation. The equivalent embodiments that are partially changed or modified in the technical content disclosed by the creation, and do not deviate from the content of the technical solution of this creation, are still within the scope of the technical solution of this creation.

10: Hood 101: top edge 102: bottom edge 103: side 104: Water-absorbing layer 105: Waterproof layer 106: filter layer 11: First fold 111: Outer flake 112: inner sheet 113: Bending part 12: Second fold 121: Outer flake 122: inner sheet 123: Bending part 13: Third fold 131: Outer flake 132: inner sheet 133: Bending part 20: Nose bridge 30: Support bar 30A: The first support bar 30B: The second support bar 30C: The third support bar 40: Hanging ears 50: auxiliary support bar G: Spacing S: Space

Fig. 1 is a perspective view of the appearance of the first preferred embodiment of the creation. Figure 2 is a partial cross-sectional view of the first preferred embodiment of the invention. Figure 3 is a partial cross-sectional view of the first preferred embodiment of the present creation. Fig. 4 is a partial cross-sectional view of another aspect of the first preferred embodiment of the present creation. Figure 5 is a side view of the wearing schematic diagram of the first preferred embodiment of the present creation. Fig. 6 is a side view of the wearing schematic diagram of the first preferred embodiment of the creation. Fig. 7 is a partial cross-sectional view of the second preferred embodiment of the present creation. Fig. 8 is a schematic diagram of wearing a side view of the second preferred embodiment of the present creation. Figure 9 is a partial cross-sectional view of the third preferred embodiment of the present creation.

10: Hood

101: top edge

102: bottom edge

103: side

11: First fold

12: Second fold

13: Third fold

20: Nose bridge

30: Support bar

40: Hanging ears

Claims (10)

A support type mask, which includes: A cover, the cover includes a top edge and a bottom edge opposite to each other, two opposite sides, and a first fold, a second fold and a third fold, the first fold is close to the cover The top edge of the body, the third fold is close to the bottom edge of the cover, and the second fold is located between the first fold and the third fold; and There are at least two support bars, each of which is elongated and flexible, the at least two support bars are arranged at intervals and extend toward both sides of the cover, and the at least two support bars are arranged on the second fold. The supporting mask according to claim 1, wherein the at least two supporting bars are two supporting bars, and the outer sides of the two supporting bars are separated by a distance, and the distance is in the range of 2.3 to 2.7 cm. The support mask according to claim 2, wherein the outer side of a support strip near the top edge of the cover is separated from the top edge by a distance, and the distance ranges from 2.6 to 3.0 cm. The support type mask according to claim 3, wherein the first fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the outer layer sheet body and the inner layer sheet body of the first fold ; The second fold includes an outer layer sheet body, an inner layer sheet body, and a bent portion connecting the second fold outer layer sheet body and the inner layer sheet body, the second folded outer layer sheet body and the first The folded inner layer sheet body is connected in a bending manner so that the first folded inner layer sheet body is interposed between the first folded outer layer sheet body and the second folded outer layer sheet body; the two supporting strips are arranged In the second folded outer layer sheet body, the outer side of one of the support strips is adjacent to the bending connection between the second folded outer layer sheet body and the first folded inner layer sheet body; The outer side of the support bar is adjacent to the second bend. The support type mask according to claim 4, wherein the cover includes a water-absorbing layer, a waterproof layer, and a filter layer between the water-absorbing layer and the waterproof layer; the two supporting strips are between Between the waterproof layer and the filter layer. The support type mask according to claim 5, wherein the third fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the outer layer sheet body and the inner layer sheet body of the third fold , The third folded outer layer sheet body and the second folded inner layer sheet body are connected in a bending manner, so that the second folded inner layer sheet body is interposed between the second folded outer layer sheet body and the third Between the folded outer sheets; the support mask further includes an auxiliary support strip, which is elongated, flexible, and extends toward both sides of the cover, and the auxiliary support strip directly It is attached to the water-absorbing layer and is adjacent to the bending joint of the outer sheet body of the third fold. The support mask according to claim 6, wherein the water-absorbing layer, the waterproof layer, and the filter layer are thermally welded to each support bar. The support mask according to claim 1, wherein the first fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the outer layer sheet body and the inner layer sheet body of the first fold ; The second fold includes an outer layer sheet body, an inner layer sheet body, and a bent portion connecting the second fold outer layer sheet body and the inner layer sheet body, the second folded outer layer sheet body and the first The folded inner layer sheet body is bent and connected, so that the first folded inner layer sheet body is interposed between the first folded outer layer sheet body and the second folded outer layer sheet body; the at least two supporting strips Two support bars, two of the support bars are arranged on the second folded outer layer sheet body, one of the support bars is adjacent to the bending connection between the second folded outer layer sheet body and the first folded inner layer sheet body ; Another bending part of the support bar adjacent to the second bend. The support type mask according to claim 8, wherein the third fold includes an outer sheet body, an inner layer sheet, and a bending portion connecting the outer layer sheet body and the inner layer sheet body of the third fold , The third folded outer layer sheet body and the second folded inner layer sheet body are connected in a bending manner, so that the second folded inner layer sheet body is interposed between the second folded outer layer sheet body and the third The support mask further includes an auxiliary support bar, which is elongated, flexible, and extends toward both sides of the cover, and the auxiliary support bar is adjacent to The third fold is the bending joint of the outer layer sheet body. The support mask according to claim 1, wherein the first fold includes an outer layer sheet body, an inner layer sheet body, and a bending portion connecting the outer layer sheet body and the inner layer sheet body of the first fold ; The second fold includes an outer layer sheet body, an inner layer sheet body, and a bent portion connecting the second fold outer layer sheet body and the inner layer sheet body, the second folded outer layer sheet body and the first The folded inner layer sheet body is bent and connected, so that the first folded inner layer sheet body is between the first folded outer layer sheet body and the second folded outer layer sheet body; the third fold includes a The outer layer sheet body, an inner layer sheet body, and a bending portion connecting the third folded outer layer sheet body and the inner layer sheet body, the third folded outer layer sheet body and the second folded inner layer sheet body are bent Folded and connected, so that the second-folded inner-layer sheet is interposed between the second-folded outer-layer sheet and the third-folded outer-layer sheet; the at least two supporting strips are three supporting strips, of which One support bar is provided on the second folded outer layer sheet and is adjacent to the bending connection between the second folded outer layer sheet and the first folded inner layer sheet, and the other support strip is provided on the second folded outer sheet body. The outer sheet body is folded and is adjacent to the second folded portion, and the remaining support bar is provided on the second folded inner layer sheet and is adjacent to the second folded inner layer sheet and the third folded The bending joint of the outer sheet body.

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