A food bag which is easily folded into a box and a folding method thereof

Abstract

The application discloses a food bag which can be folded into a box conveniently, comprising a bag body, the bag body comprises a first panel (1) and a second panel (2) which are overlapped and sealed at the bottom, and a cavity body (5) which is opened between the first panel (1) and the second panel (2) and can form a semi-closed structure with a closed bottom and an open top; characterized in that: the first panel (1) and the second panel (2) are provided with a sealing body (3) at the bottom, and the sealing body (3) forms a sealing line (4) on the first panel (1) and the second panel (2). The food bag has simple structure, is flat, small in volume, light in weight and convenient to carry, can be folded into a box to hold food when used, can be disassembled and folded into a flat shape again after use, and thus can be recycled conveniently, and is suitable for popularization and use.

Description

TECHNICAL FIELD

[0001] The present application relates to a food bag, in particular to a food bag which can be folded into a box conveniently and a folding method thereof. BACKGROUND

[0002] With the development of urbanization of the country, a large number of population enter the city life, the scale of each city is expanding, and the citizens live in the populous and noisy downtown area for a long time, and they like to go to the suburb for recreation in the leisure time such as weekends or holidays. Since the suburb is far away, and the traffic in the city is busy and there are many traffic lights, the time is delayed, so it is necessary to have a meal outside. Picnic can ensure the meal and has the playfulness, and is suitable for people of all ages, so it has become a play project for outing. Picnic needs to prepare more food, and also needs to take a plurality of food containers, and currently, household utensils or disposable paper cups or lunch boxes are usually used to contain food, but since the household utensils or disposable paper cups or lunch boxes are large in size and inconvenient to carry, and the household utensils are generally heavy, and it is troublesome to recycle after the meal, so it brings great obstacles to the picnic project, and some people give up the picnic. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the present application is to provide a food bag which can be folded into a box conveniently and a folding method thereof. The food bag itself is flat, small in size and light in weight, convenient to carry, can be folded into a box for containing food when used, and can be disassembled and folded into a flat shape again after use, so it is convenient to recycle.

[0004] The purpose of the present application is achieved by the following technical solutions:

[0005] A food bag which can be folded into a box conveniently, comprising a bag body, the bag body comprising a first panel and a second panel which overlap each other and are sealed at the bottom, and a cavity body of a semi-closed structure which is formed by supporting apart the first panel and the second panel and has a closed bottom and an open top; the first panel and the second panel are provided with a sealing body at the bottom, the sealing body forms a sealing line on the first panel and the second panel, the left end point of the sealing line is set as end point A, and the right end point of the sealing line is set as end point B.

[0006] The first panel has vertical creases 1L and 2L, and horizontal creases 3L that intersect creases 1L and 2L and are parallel to the sealing line. The second panel has creases 1L′, 2L′, and 3L′ corresponding to those on the first panel. The intersection of crease 3L and crease 1L is designated as intersection point C, the intersection of crease 3L and crease 2L is designated as intersection point D, the intersection of crease 3L′ and crease 1L′ is designated as intersection point C′, and the intersection of crease 3L′ and crease 2L′ is designated as intersection point D′. The first panel has crease 4L between endpoint A and intersection point C, and crease 5L between endpoint B and intersection point D. The second panel has crease 4L′ between endpoint A and intersection point C′, and crease 5L′ between endpoint B and intersection point D′.

[0007] The sealing body has a crease 6L located below the sealing line, and a cut 1H with a depth reaching the crease 6L is provided in the middle of the sealing body. The two ends of the sealing body have cuts 2H and 3H that can be inserted into each other. Cuts 2H and 3H are located between the bottom edge of the sealing body and the crease 6L. Cuts 1H, 2H and 3H are all straight cuts, and the depth of cuts 2H and 3H is less than or equal to the depth of cut 1H.

[0008] Furthermore, the top opening of the bag is provided with a bag cap, and there is a tearable structure between the bag cap and the bag body.

[0009] Specifically, the tearable structure is a point-break tear line.

[0010] Alternatively, the tearable structure includes a tearable strip disposed between the bag cap and the bag body, and a dotted tear line disposed between the tearable strip and the bag cap and between the tearable strip and the bag body.

[0011] To facilitate tearing off the tear strip, the tear strip has tear-off sections that protrude from both the bag cap and the bag body.

[0012] A method for folding a food bag that is easy to fold into a box includes the following steps:

[0013] A, separate the first and second pages along the opening of the bag, and press the left and right edges of the bag inward, so that the crease 1L is separated from the crease 1L', the part above the crease 3L and the crease 3L' of the crease 1L and the crease 1L' forms two side edge lines of the cavity, and forms the left side of the cavity; the crease 2L is separated from the crease 2L', the part above the crease 3L and the crease 3L' of the crease 2L and the crease 2L' forms another two side edge lines of the cavity, and forms the right side of the cavity; the part above the crease 3L between the crease 1L and the crease 2L on the first page is the front of the box, and the part above the crease 3L' between the crease 1L' and the crease 2L' on the second page is the back of the box; and the crease 3L is separated from the crease 3L', the part below the crease 3L and the crease 3L' of the first and second pages forms the bottom of the cavity, that is, the quadrilateral CC'D'D; at the same time, triangular inclined surfaces, ΔACC' and ΔBDD', are formed on the left and right sides of the bottom of the bag respectively;

[0014] B, hold the triangular inclined surface on the left with the left hand, hold the triangular inclined surface on the right with the right hand, and pull the two triangular inclined surfaces outward so that they are flattened and located in the same plane as the bottom of the box;

[0015] C, the cut 1H separates the sealing body into two parts on the left and right sides of the cut 1H, and the two parts of the sealing body are folded in opposite directions along the crease 6L, and the two separated parts of the sealing body are tightly attached to the bottom of the box;

[0016] D, fold the ΔACC' and the sealing body below it along the crease 1L and the crease 1L' on the lower bottom towards the cut 1H, and fold the ΔBDD' and the sealing body below it along the crease 2L and the crease 2L' on the lower bottom towards the cut 1H; separate the sealing body on the left side of the cut 1H along the cut 2H, and separate the sealing body on the right side of the cut 1H along the cut 3H, insert the cut 3H into the cut 2H, and make the sealing body on the right side of the cut 1H cross-locked with the sealing body on the left side of the cut 1H under the action of the cut 2H and the cut 3H.

[0017] In order to close the opening of the bag and prevent foreign matter from entering the bag or contaminating the opening of the bag, a bag cap is provided at the top opening end of the bag, and a tearable tearable structure is provided between the bag cap and the bag, and the tearable structure is a point breaking type tear line;

[0018] The bag cap is torn off along the point breaking type tear line before step A is folded, so that the bag is exposed.

[0019] Alternatively, a bag cap is provided at the top opening end of the bag, and a tearable tearable structure is provided between the bag cap and the bag; the tearable structure comprises a tearable strip provided between the bag cap and the bag, and a point breaking type tear line provided between the tearable strip and the bag cap and provided between the tearable strip and the bag.

[0020] The tearable strip is torn along the point-breaking tear line before folding in step A, the bag cap is removed and the opening of the bag body is exposed.

[0021] In order to better realize the present application, the tearable strip is provided with tearable portions which protrude from the bag cap and the bag body, and the tearable portions are pinched by fingers to tear off the tearable strip.

[0022] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0023] (1) The food bag of the present application has a simple structure and is convenient to use. The food bag itself is flat, small in volume and light in weight, and can be conveniently carried. When used, the food bag can be folded into a box to hold food, and after use, the food bag can be disassembled and folded into a flat shape again, so it can be conveniently recycled.

[0024] (2) The bag body of the present application is provided with a bag cap at the top opening end, and the bag cap is used to close the opening of the bag body to prevent foreign matter from entering the bag body or contaminating the opening of the bag body. The tearable structure provided between the bag cap and the bag body can facilitate tearing off the bag cap and exposing the opening of the bag body.

[0025] (3) The tearable structure of the present application is a point-breaking tear line, which facilitates tearing the bag cap along the point-breaking tear line and avoids tearing the bag body.

[0026] (4) The bag cap and the bag body of the present application are provided with a tearable strip, and the bag cap can be torn off by tearing off the tearable strip. The point-breaking tear line provided between the tearable strip and the bag cap and between the tearable strip and the bag body facilitates tearing off the tearable strip.

[0027] (5) The tearable strip of the present application is provided with tearable portions which protrude from the bag cap and the bag body, which facilitates pinching the tearable portions with hands and tearing off the tearable strip.

[0028] (6) The folding method of the present application is simple and easy to operate. The portions of the first and second pages above the creases 3L and 3L' are folded to form four side surfaces of the box body and form a cavity for holding food, and the portions of the first and second pages below the creases 3L and 3L' are folded to form a bottom surface of the box body. The sealing bodies on the left and right sides of the cutout 1H are inserted into the cutouts 2H and 3H and cross-locked to fix the bottom surface of the box body and prevent the bottom surface and the four side surfaces of the box body from deforming. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0030] Figure 2 It is a schematic diagram of the structure when folding the present application;

[0031] Figure 3 Fig. 1 is a perspective view of the present application; Figure 2 Fig. 2 is a plan view of the present application;

[0032] Figure 4 Fig. 3 is a bottom view of the present application when folded;

[0033] Figure 5 Fig. 4 is a structural schematic view of the present application when folded ACC' and BDD' are folded;

[0034] Figure 6 Fig. 5 is a structural schematic view of the present application when cutout 2H and cutout 3H are inserted into each other and locked to the seal;

[0035] Figure 7 Fig. 6 is a structural schematic view of the present application when a tearable strip is provided between the bag body and the bag cap.

[0036] In the drawings, the names corresponding to the reference numerals are as follows:

[0037] 1 - first panel, 11 - crease 1L, 12 - crease 2L, 13 - crease 3L, 14 - crease 4L, 15 - crease 5L, 2 - second panel, 21 - crease 1L', 22 - crease 2L', 23 - crease 3L', 24 - crease 4L', 25 - crease 5L', 3 - seal, 31 - cutout 1H, 32 - cutout 2H, 33 - cutout 3H, 34 - crease 6L, 4 - seal line, 5 - cavity, 6 - bag cap, 7 - point-break tear line, 8 - tearable strip, 81 - tearable part. DETAILED DESCRIPTION

[0038] The present application will be further described in detail below in connection with examples:

[0039] Example 1

[0040] As Figures 1-6As shown, the food bag of the present application is folded into a box conveniently, which comprises a bag body. The bag body can be made of food-grade paper material, or other food-grade material with certain hardness and foldable. The bag body is in a whole rectangular shape, and the front and back of the bag body are completely symmetrical. Specifically, the bag body comprises a first panel 1 and a second panel 2 which are overlapped and sealed at the bottom. The first panel 1 is the front of the bag body, and the second panel 2 is the back of the bag body. The first panel 1 and the second panel 2 are provided with a sealing body 3 at the bottom. The sealing body 3 forms a sealing line 4 on the first panel 1 and the second panel 2. The first panel 1 and the second panel 1 can be opened, and a cavity body 5 with a semi-closed structure with a closed bottom and an open top is formed between the first panel 1 and the second panel 1. For the convenience of description, the left end point of the sealing line 4 is set as end point A, and the right end point of the sealing line 4 is set as end point B. The direction in this embodiment refers to the up, down, left and right directions and vertical and horizontal directions directly shown in the schematic diagram. For the convenience of description, the thickness of the material itself is ignored in the schematic diagram of this embodiment.

[0041] In order to fold the food bag of the present application into a box that can hold food, the first panel 1 is provided with a crease 1L11 and a crease 2L12 in the vertical direction, and a crease 3L13 which intersects with the crease 1L11 and the crease 2L12 in the horizontal direction, and the crease 3L13 is parallel to the sealing line 4, as shown. Figure 1 Correspondingly, the second panel 2 is provided with a crease 1L'21, a crease 2L'22 and a crease 3L'23 corresponding to the first panel 1. In order to facilitate folding, the intersection of the crease 3L13 and the crease 1L11 is set as intersection point C, and the intersection of the crease 3L13 and the crease 2L12 is set as intersection point D. Correspondingly, the intersection of the crease 3L'23 and the crease 1L'21 is set as intersection point C', and the intersection of the crease 3L'23 and the crease 2L'22 is set as intersection point D'. The first panel 1 is provided with a crease 4L14 between the end point A and the intersection point C, and a crease 5L15 between the end point B and the intersection point D. At the same time, the second panel 2 is provided with a crease 4L'24 between the end point A and the intersection point C', and a crease 5L'35 between the end point B and the intersection point D'.

[0042] In order to fix the box body when the food bag of the present application is folded into a food box, prevent the box body from being deformed under the action of the above multiple creases and causing adverse consequences when food is contained, a crease 6L34 is arranged on the sealing body 3 below the sealing line 4, and a cut 1H31 is arranged in the middle of the sealing body 3 with a depth reaching the crease 6L34. The two ends of the sealing body 3 are respectively provided with a cut 2H32 and a cut 3H33 which can be inserted into each other, and the cut 2H32 and the cut 3H33 are arranged between the bottom edge of the sealing body 3 and the crease 6L34. In the implementation, the cut 1H31, the cut 2H32 and the cut 3H33 are all linear cuts, and the depth of the cut 2H32 and the cut 3H33 is less than or equal to the depth of the cut 1H31, that is, the depth of the cut 2H32 and the cut 3H33 does not exceed the crease 6L34.

[0043] In order to close the opening of the bag body, prevent foreign matters from entering the cavity 5 of the bag body and / or polluting the opening of the bag body, the top opening end of the bag body of the present application is provided with a bag cap 6, as shown in Figure 1 A tearable tearable structure is arranged between the bag cap 6 and the bag body to facilitate tearing off the bag cap 6 and opening the food bag. In the embodiment, the tearable structure is a point-breaking tear line 7, as shown in Figure 1 When used, the bag cap 6 can be torn off along the point-breaking tear line 7, and tearing of the bag body can also be avoided.

[0044] The method for folding the food bag folded into a box of the present application needs to tear off the bag cap 6 along the point-breaking tear line 7 before folding, so that the bag body is exposed and opened. The folding method includes the following steps:

[0045] A. Separate the first panel 1 and the second panel 2 along the opening of the bag body, and press inward along the left and right side edges of the bag body to separate the crease 1L11 from the crease 1L'21. The crease 1L11 and the crease 1L'21 form two side edge lines of the cavity 5 and a left side of the cavity 5 above the creases 3L13 and 3L'23.

[0046] Separate the crease 2L12 from the crease 2L'22. The crease 2L12 and the crease 2L'22 form two side edge lines of the cavity 5 and a right side of the cavity 5 above the creases 3L13 and 3L'23. The part above the crease 3L13 between the crease 1L11 and the crease 2L12 on the first panel 1 is the front face of the box body, as shown in Figure 2 The part above the crease 3L'23 between the crease 1L'21 and the crease 2L'22 on the second panel 2 is the back face of the box body.

[0047] And separate crease 3L13 from crease 3L′23. The parts of the first panel 1 and the second panel 2 below crease 3L13 and crease 3L′23 form the bottom surface of the cavity 5, namely quadrilateral CC′D′D; at the same time, triangular inclined surfaces, namely ΔACC′ and ΔBDD′, are formed on the left and right sides of the bottom of the bag.

[0048] B. Pinch the left-side triangular slope with your left hand and the right-side triangular slope with your right hand, then pull them outwards to flatten the two triangular slopes and align them with the bottom surface of the box. Figure 3 As shown. During implementation, use the index, middle, ring, and little fingers of your left hand to support the lower base of the left triangular slope side by side, and use your left thumb to press down on the upper base of the left triangular slope side by side; use the index, middle, ring, and little fingers of your right hand to support the lower base of the right triangular slope side by side, and use your right thumb to press down on the upper base of the right triangular slope side by side, and then pull the two triangular slopes while trying to keep the triangular planes from deforming.

[0049] C. The cut 1H31 divides the sealing body 3 into two parts located on the left and right sides of the cut 1H31. The two parts of the sealing body 3 are folded in opposite directions along the crease 6L34, as follows: Figure 4 As shown, the two separate sealing parts 3 are tightly attached to the bottom surface of the box.

[0050] D. Fold ΔACC′ and the sealing body 3 below it along the creases 1L11 and 1L′21 on the bottom edge towards the cut 1H31, and fold ΔBDD′ and the sealing body 3 below it along the creases 2L12 and 2L′22 on the bottom edge towards the cut 1H31, as follows: Figure 5 As shown, the creases 6L34 on the two triangles will be on the same horizontal line, the apex of the two triangles will overlap, and the cuts 2H32 and 3H33 will be on a vertical line. Separate the sealing body 3 on the left side of cut 1H31 along cut 2H32, and separate the sealing body 3 on the right side of cut 1H31 along cut 3H33. Insert cut 3H33 into cut 2H32, so that the sealing body 3 on the right side of cut 1H31 and the sealing body 3 on the left side of cut 1H31 interlock under the action of cuts 2H32 and 3H33, as shown. Figure 6 As shown, this design secures and flattens the bottom surface of the box, preventing deformation. After use, the two sealed parts 3 can be separated along the cuts 2H32 and 3H33, and disassembled back into the original flat food bag for easy recycling. Alternatively, the box can be kept intact for storing food or food scraps, as needed.

[0051] Example 2

[0052] like Figure 7As shown, the present embodiment is basically the same as that of Embodiment 1, except that the tearable structure comprises a tearable strip 8 arranged between the bag cap 6 and the bag body, and tearing off the tearable strip 8 can tear off the bag cap 6 and expose the opening of the bag body. In order to facilitate tearing off the tearable strip 8, a dotted tear line 7 is arranged between the tearable strip 8 and the bag body, and a dotted tear line 7 is also arranged between the tearable strip 8 and the bag cap 6. In order to facilitate tearing off the tearable strip 8, a tearing portion 9 protruding from the bag cap 6 and the bag body is further arranged on the tearable strip 8. Before folding, the tearing portion 9 is pinched by fingers, and the tearable strip 8 can be torn off along the dotted tear line 7, so that the bag cap 6 is torn off and the opening of the bag body is exposed.

[0053] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A food bag which is easily folded into a box, comprising a bag body, the bag body comprising a first panel (1) and a second panel (2) which are overlapped and sealed at the bottom in a flat state, and a cavity (5) which is opened between the first panel (1) and the second panel (2) and can form a semi-closed structure with a closed bottom and an open top; characterized in that: The first surface (1) and the second surface (2) are provided with a sealing body (3) at the bottom, the sealing line (4) is formed on the first surface (1) and the second surface (2), the left end point of the sealing line (4) is set as the end point A, and the right end point of the sealing line (4) is set as the end point B; The first surface (1) is provided with a crease 1L (11) and a crease 2L (12) in the vertical direction, and the first surface (1) is provided with a crease 3L (13) in the horizontal direction, which intersects the crease 1L (11) and the crease 2L (12) and is parallel to the sealing line (4); the second surface (2) is provided with a crease 1L' (21), a crease 2L' (22) and a crease 3L' (23) corresponding to the first surface (1); the intersection point of the crease 3L (13) and the crease 1L (11) is set as the intersection point C, the intersection point of the crease 3L (13) and the crease 2L (12) is set as the intersection point D, the intersection point of the crease 3L' (23) and the crease 1L' (21) is set as the intersection point C', and the intersection point of the crease 3L' (23) and the crease 2L' (22) is set as the intersection point D'; the first surface (1) is provided with a crease 4L (14) between the end point A and the intersection point C, and the first surface (1) is provided with a crease 5L (15) between the end point B and the intersection point D; the second surface (2) is provided with a crease 4L' (24) between the end point A and the intersection point C', and the second surface (2) is provided with a crease 5L' (35) between the end point B and the intersection point D'; The sealing body (3) is provided with a crease 6L (34) below the sealing line (4), and the middle of the sealing body (3) is provided with a cutout 1H (31) with a depth reaching the crease 6L (34), and the two ends of the sealing body (3) are respectively provided with a cutout 2H (32) and a cutout 3H (33) which can be inserted into each other, the cutout 2H (32) and the cutout 3H (33) are located between the bottom edge of the sealing body (3) and the crease 6L (34); the cutout 1H (31), the cutout 2H (32) and the cutout 3H (33) are all straight cutouts, and the depth of the cutout 2H (32) and the cutout 3H (33) is less than or equal to the depth of the cutout 1H (31); fold ΔACC' and the sealing body (3) below it along the crease 1L (11) and the crease 1L' (21) on the lower bottom to the direction of the cutout 1H (31), and fold ΔBDD' and the sealing body (3) below it along the crease 2L (12) and the crease 2L' (22) on the lower bottom to the direction of the cutout 1H (31); separate the sealing body (3) on the left side of the cutout 1H (31) along the cutout 2H (32), and separate the sealing body (3) on the right side of the cutout 1H (31) along the cutout 3H (33), insert the cutout 3H (33) into the cutout 2H (32), so that the sealing body (3) on the right side of the cutout 1H (31) and the sealing body (3) on the left side of the cutout 1H (31) are crossed and locked under the action of the cutout 2H (32) and the cutout 3H (33) and form a box body.

2. The ready-to-fold-into-a-box food bag according to claim 1, characterized in that: The bag body is provided with a bag cap (6) at the top opening end, and a tearable structure is provided between the bag cap (6) and the bag body.

3. A food bag for easy folding into a box according to claim 2, characterized in that: The tearable structure is a point-breaking tear line (7).

4. The ready-to-fold-into-a-box food bag according to claim 2, wherein: The tearable structure comprises a tearable strip (8) arranged between the bag cap (6) and the bag body, and a point-breaking tear line (7) arranged between the tearable strip (8) and the bag cap (6) and between the tearable strip (8) and the bag body.

5. The ready-to-fold-into-a-box food bag according to claim 4, characterized in that: The tearable strip (8) is provided with a tearable part (81) protruding from the bag cap (6) and the bag body.

6. A method of folding the ready-to-fold-into-box food bag of claim 1 into a box, characterized by: The method comprises the following steps: A. Separate the first panel (1) and the second panel (2) along the opening of the bag body, and press the left and right side edges of the bag body inward, so that the crease 1L (11) and the crease 1L' (21) are separated, the crease 1L (11) and the crease 1L' (21) above the crease 3L (13) and the crease 3L' (23) form two side edge lines of the cavity (5), and form the left side of the cavity (5); the crease 2L (12) and the crease 2L' (22) are separated, the crease 2L (12) and the crease 2L' (22) above the crease 3L (13) and the crease 3L' (23) form two other side edge lines of the cavity (5), and form the right side of the cavity (5); the part above the crease 3L (13) between the crease 1L (11) and the crease 2L (12) on the first panel (1) is the front of the box body, and the part above the crease 3L' (23) between the crease 1L' (21) and the crease 2L' (22) on the second panel (2) is the back of the box body; and the crease 3L (13) and the crease 3L' (23) are separated, the first panel (1) and the second panel (2) below the crease 3L (13) and the crease 3L' (23) form the bottom of the cavity (5), that is, the quadrilateral CC' D' D; at the same time, triangular inclined surfaces ΔACC' and ΔBDD' are respectively formed on the left and right sides of the bottom of the bag body; B. Hold the triangular inclined surface on the left side with the left hand, hold the triangular inclined surface on the right side with the right hand, and pull the two triangular inclined surfaces outward, so that the two triangular inclined surfaces are flattened and located in the same plane as the bottom of the box body; C. The cut 1H (31) divides the sealing body (3) into two parts located on the left and right sides of the cut 1H (31), respectively, and the two parts of the sealing body (3) are folded in opposite directions along the crease 6L (34), and the two separated parts of the sealing body (3) are tightly attached to the bottom of the box body; D. Fold ΔACC' and the sealing body (3) below ΔACC' along the crease 1L (11) and the crease 1L' (21) on the lower bottom towards the cut 1H (31), and fold ΔBDD' and the sealing body (3) below ΔBDD' along the crease 2L (12) and the crease 2L' (22) on the lower bottom towards the cut 1H (31); separate the sealing body (3) on the left side of the cut 1H (31) along the cut 2H (32), and separate the sealing body (3) on the right side of the cut 1H (31) along the cut 3H (33), insert the cut 3H (33) into the cut 2H (32), and make the sealing body (3) on the right side of the cut 1H (31) and the sealing body (3) on the left side of the cut 1H (31) cross and lock with each other under the action of the cut 2H (32) and the cut 3H (33).

7. The method of claim 6, wherein: The bag body top opening end is provided with a bag cap (6), and a tearable tearable structure is arranged between the bag cap (6) and the bag body. The bag cap (6) is torn along the point breaking tear line (7) before folding in step A, so that the bag body is exposed.

8. The method of claim 6, wherein: The bag body top opening end is provided with a bag cap (6), and a tearable tearable structure is arranged between the bag cap (6) and the bag body; the tearable structure includes a tearable strip (8) arranged between the bag cap (6) and the bag body, and a point breaking tear line (7) arranged between the tearable strip (8) and the bag cap (6) and between the tearable strip (8) and the bag body. The tearable strip (8) is torn along the point breaking tear line (7) before folding in step A, so that the bag cap (6) is removed and the bag body is exposed.

9. The method of claim 8, wherein: The tearable strip (8) is provided with a tearing and pulling part (81) protruding from the bag cap (6) and the bag body, so that the tearing and pulling part (81) is pinched with fingers and the tearable strip (8) is torn off.

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