Lining bag and folding method thereof

Abstract

The invention relates to a lining bag and a folding method thereof.The lining bag is provided with a front face and a bottom face which are oppositely arranged, and the lining bag is arranged to be folded to be provided with a first folding part, a second folding part, a third folding part and a fourth folding part; the first folding part, the second folding part and the third folding part are connected to different side edges of the fourth folding part respectively, the lining bag is sequentially unfolded in the IBC box according to the folding sequence, and the lining bag can be fully filled without being manually adjusted in the filling period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of logistics containers, in particular to an inner liner bag and a folding method thereof. BACKGROUND

[0002] Foldable containers can greatly reduce the space occupation by folding when empty, and have better cost advantages for warehouse space and return logistics transportation. Compared with non-foldable containers, foldable containers have obvious advantages, so more and more industries seek to replace non-foldable containers with foldable containers. For example, foldable IBC (intermediate bulk container) is gradually replacing integrated ton barrel containers in the liquid packaging field. The structure of the foldable IBC generally includes a base, two pairs of side plates, and a cover. A small door is provided on one of the side plates, which can be opened outward to facilitate workers to bend into the box to perform some operations. When the box is folded, the first folded side plate and the base bearing surface are roughly laid flat, and then the remaining side plates are sequentially folded and roughly laid flat to form a folded state with unchanged length and width and reduced height. The box in this state occupies less space, thus bringing various benefits in logistics and warehousing.

[0003] When transporting liquid, an inner liner bag needs to be laid in the IBC. The structure of the inner liner bag currently used in IBC generally includes an inner liner bag body, a filling port and a discharge port provided on the inner liner bag body, and the filling port and the discharge port are respectively welded to the inner liner bag body. The existing liquid filling method is to fold the inner liner bag and then place it in the unfolded IBC, and then fill the inner liner bag through the filling port. This method requires customers to perform additional inner liner bag laying on site, and poor laying may cause problems such as incomplete filling. SUMMARY

[0004] The purpose of the present application is to provide an inner liner bag which is unfolded in the IBC according to the folding order and can be fully filled without manual adjustment of the inner liner bag during filling.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows:

[0006] An inner liner bag, the inner liner bag has a front surface and a bottom surface arranged oppositely, the inner liner bag is arranged to be folded to have a first folding part, a second folding part, a third folding part and a fourth folding part, the first folding part, the second folding part and the third folding part are respectively connected to different side edges of the fourth folding part.

[0007] In one embodiment, the inner liner bag further comprises a filling port and / or a discharge port, one of the filling port and the discharge port is arranged on the first folding part or the third folding part.

[0008] In one embodiment, the inner liner bag further comprises a filling port and a discharge port, both of which are arranged on the bottom surface of the inner liner bag, the filling port is arranged on the second folding part, and the discharge port is arranged on the first folding part or the third folding part.

[0009] In one embodiment, the filling port is located at one end of the second folding part away from the fourth folding part.

[0010] In one embodiment, the second folding part comprises a first part connected with the fourth folding part and a second part connected with the first part, the filling port is located at the second part, in the folded state, the second part is located above the first part, and the front surface of the second part is outwardly arranged.

[0011] In one embodiment, the area of the first part is equivalent to the area of the fourth folding part.

[0012] In one embodiment, the discharge port is arranged on the bottom part near the connection between the first folding part and the fourth folding part, or the discharge port is arranged on the bottom part near the connection between the third folding part and the fourth folding part.

[0013] In one embodiment, the fourth folding part is rectangular, the first folding part and the third folding part are connected to two side edges of opposite sides of the rectangle, and in the folded state, the bottom surfaces of the first folding part and the third folding part are outwardly arranged.

[0014] In one embodiment, the first folding part and the third folding part both comprise a third part and a fourth part, in the folded state, the third part is located below the second folding part, the fourth part is located above the second folding part, and the bottom surface of the fourth part is outwardly arranged, and the discharge port is arranged on the fourth part.

[0015] In one embodiment, the inner liner bag comprises a pair of parallel and spaced creases, the pair of creases separates the inner liner bag into a first region, a second region and a third region connected in sequence; wherein the first folding part is located in the first region, the second folding part and the fourth folding part are located in the second region, and the third folding part is located in the third region.

[0016] The present application also provides a folding method of an inner liner bag, the inner liner bag has a front surface and a bottom surface arranged oppositely, the inner liner bag comprises a plurality of creases, the inner liner bag is folded into a first folding part, a second folding part, a third folding part and a fourth folding part along the creases, the first folding part, the second folding part and the third folding part are connected to different side edges of the fourth folding part respectively; the following steps are performed during folding:

[0017] folding the second fold part towards the fourth fold part;

[0018] folding the first fold part and the third fold part towards the fourth fold part, respectively.

[0019] In one embodiment, the inner liner bag further comprises a filling port and / or a discharge port, one of which is arranged on the first fold part or the third fold part.

[0020] In one embodiment, the inner liner bag further comprises a filling port and a discharge port, both of which are arranged on the bottom surface of the inner liner bag, the filling port is arranged on the second fold part, and the discharge port is arranged on the first fold part or the third fold part.

[0021] In one embodiment, after folding is completed, the first fold part or the third fold part on which the discharge port is arranged is located at the outermost layer.

[0022] In one embodiment, the inner liner bag is rectangular, the creases include a first crease extending in the length direction, and a second crease and a third crease extending in the width direction and arranged at intervals, and the following steps are performed during folding:

[0023] S1, folding along the first crease with the bottom surface facing outward;

[0024] S2, folding along the second crease and the third crease, respectively, with the bottom surface facing outward;

[0025] The first fold part, the second fold part, the third fold part, and the fourth fold part are obtained by folding through the above steps S1 and S2.

[0026] In one embodiment, the creases further include a fourth crease extending in the length direction, the fourth crease is located on the side of the second fold part away from the first crease, and between steps S1 and S2, step S11 is further included: folding along the fourth crease with the front surface facing outward.

[0027] In one embodiment, the inner liner bag comprises a pair of creases arranged in parallel and at intervals, and when the inner liner bag is folded, the opposite sides of the inner liner bag are first folded towards each other along the pair of creases.

[0028] In one embodiment, the inner liner bag is rectangular, the creases include a first crease extending along the length direction, second and third creases extending along the width direction and being spaced apart, two fifth creases extending from the intersection of the first and second creases to the widthwise one side edge of the inner liner bag respectively, and two sixth creases extending from the intersection of the first and third creases to the widthwise other side edge of the inner liner bag respectively, the two fifth creases and the two sixth creases are symmetrically arranged along the first crease, and the following steps are performed when folding:

[0029] S1, folding along the second and third creases respectively with the bottom surface facing outward;

[0030] S2, folding along the first crease to divide the inner liner bag into two substantially vertical parts;

[0031] S3, unfolding outward along the two fifth creases and unfolding outward along the two sixth creases;

[0032] S4, folding along the first crease with the bottom surface facing outward while covering one of the fifth creases and one of the sixth creases;

[0033] S5, folding along the second and third creases respectively with the bottom surface facing outward;

[0034] The first, second, third and fourth folded parts are obtained through the steps S1 to S5.

[0035] In one embodiment, the creases further include a seventh crease extending along the length direction, the seventh crease is located on the side of the second folded part away from the first crease, and between the step S4 and the step S5, there is further a step S41 of folding along the seventh crease with the front surface facing outward.

[0036] The inner liner bag and the folding method thereof provided by the present application have the beneficial effects that, through the specific folding manner, the inner liner bag is unfolded in the IBC tank according to the folding sequence, and the inner liner bag can be fully filled without manual adjustment during filling, which greatly reduces the labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The schematic diagram of the tank structure of the IBC is shown.

[0038] Figure 2 The schematic diagram of the inner liner bag folded in the first manner unfolded in the tank of the IBC to start filling is shown.

[0039] Figure 3 The schematic diagram of the inner liner bag is shown.

[0040] Figure 4 A schematic diagram is shown of the inner lining bag folded in the first manner unfolded inside the IBC box.

[0041] Figure 5 A schematic diagram showing the crease location of the inner lining bag folded in the first manner is shown.

[0042] Figure 6 This diagram illustrates the first step of folding the inner lining bag along the crease in the first manner.

[0043] Figure 7 The diagram illustrates the second step of folding the inner lining bag along the crease in the first manner.

[0044] Figure 8 The diagram illustrates the third step of folding the inner lining bag along the crease in the first manner.

[0045] Figure 9 The diagram illustrates the fourth step of folding the inner lining bag along the crease in the first manner.

[0046] Figure 10 The diagram illustrates the fifth step of folding the inner lining bag along the crease in the first manner.

[0047] Figure 11 The diagram illustrates the sixth step of folding the inner lining bag along the crease in the first manner.

[0048] Figure 12 The diagram illustrates the seventh step of folding the inner lining bag along the crease in the first manner.

[0049] Figure 13 The diagram illustrates the eighth step of folding the inner lining bag along the crease in the first manner.

[0050] Figure 14 The diagram illustrates the ninth step of folding the inner lining bag along the crease in the first manner.

[0051] Figure 15 The diagram shows the structure of the inner lining bag after it has been folded along the crease in the first manner.

[0052] Figure 16 A schematic diagram showing the crease location of the inner lining bag folded in the second manner is shown.

[0053] Figure 17 This diagram illustrates the first step of folding the inner lining bag along the crease in a second manner.

[0054] Figure 18 This diagram illustrates the second step of folding the inner lining bag along the crease in a second manner.

[0055] Figure 19The diagram illustrates the third step of folding the inner lining bag along the crease in a second manner.

[0056] Figure 20 A schematic diagram of the structure of the inner lining bag after it has been folded along the crease in the second manner is shown.

[0057] Figure 21 A schematic diagram is shown of the inner lining bag folded in the second manner unfolded inside the IBC box.

[0058] Figure 22 A schematic diagram is shown of the inner liner bag folded in the second manner unfolding inside the IBC box to begin filling. Detailed Implementation

[0059] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0060] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0061] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0062] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0063] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0064] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0065] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0066] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] This invention provides an inner liner bag and its folding method. The inner liner bag of this invention is used in conjunction with a transfer container to allow the transfer container to hold liquid. See also Figure 1 and Figure 2 In this embodiment, the transport container is a collapsible IBC, but it should be understood that the inner liner bag can also be used in a non-collapsible box. The IBC includes a base 1, a pair of opposing first side panels 2, and a pair of opposing second side panels 3. The first side panels 2 and second side panels 3 are adjacent to each other and, in the upright state, define the internal volume together with the base 1. Preferably, the first side panels 2 and second side panels 3 are made of a high-strength material such as high-strength plastic. Typically, the length of the first side panel 2 is shorter than the length of the second side panel 3 to form a generally cuboid IBC. Therefore, the first side panel 2 is also referred to as the short side panel, and the second side panel 3 is also referred to as the long side panel. However, it should be understood that the first side panels 2 and second side panels 3 can also be of the same length to form a square IBC. The bottom ends of the first side panels 2 and second side panels 3 are connected to four edges on the base 1 by a hinge structure. One pair of opposing edges of the four edges is provided with an upward guard 4, the height of which is approximately equal to the thickness of the side panels provided on the adjacent pair of edges, and the guard 4 defines a space for accommodating the adjacent side panels folded onto the base 1. Thus, the first side plate 2 and the second side plate 3 can be folded successively onto the base 1, so that the IBC is in a folded state.

[0068] The inner liner bag 5 is placed inside the IBC and works in conjunction with the IBC to facilitate liquid transfer. See also Figure 3The inner liner bag 5 includes an inner liner bag body 51, a filling port 52, and a discharge port 53. The inner liner bag body 51 is formed by sealing and welding a front piece and a rear piece around its perimeter. The main welding lines of the inner liner bag are formed around the perimeter of the inner liner bag body 51. The front piece and the rear piece are flexible sheets that are substantially rectangular or approximately rectangular, such as polygons formed by beveling the four corners of a rectangle. The front piece and the rear piece are usually made of plastic. The filling port 52 and the discharge port 53 are sealed to the inner liner bag body and are both located on the rear piece, that is, the filling port 52 and the discharge port 53 are both located on one side of the bottom surface of the inner liner bag.

[0069] Because the inner liner bag 5 is made of a flexible sheet material, it can be folded to reduce its volume for easy storage and handling. See also Figure 4 The inner liner bag 5 is configured to have a first fold 501, a second fold 502, a third fold 503, and a fourth fold 504 through a folding operation. The first fold 501, second fold 502, and third fold 503 are respectively connected to different sides of the fourth fold 504. A filling port 52 is located on the second fold 502, and a discharge port 53 is located on the first fold 501. It should be understood that the discharge port 53 may also be located on the third fold 503. Furthermore, it should be understood that the inner liner bag 5 may also have only one opening, which can serve as both a filling port and a discharge port. When there is only one opening, it can be located either at the position of the filling port 52 or at the position of the discharge port 53.

[0070] The fourth fold 504 corresponds to the base 1 of the IBC. The fourth fold 504 is folded into a rectangular or approximately rectangular shape with an area roughly the same as the base 1. The first fold 501 and the third fold 503 are connected to the two opposite sides of the rectangle, with the bottom surfaces of the first and third folds facing outwards, so that the discharge port 53 corresponds to the drain port 6 on the IBC. See also... Figure 2 In this embodiment, the drain port 6 of the IBC is located at the base edge corresponding to one of the short side plates. Since the drain port 53 is located on the first fold 501 or the third fold 503, the first fold 501 or the third fold 503 corresponds to a pair of first side plates 2. It should be understood that if the drain port is located on the long side plate, the first fold 501 or the third fold 503 corresponds to a pair of second side plates 3. Preferably, the drain port 53 is located near the bottom where the first fold 501 connects to the fourth fold 504, or near the bottom where the third fold 503 connects to the fourth fold 504, so that the position of the drain port 53 of the inner liner bag 5 corresponds to the drain port 6 on the IBC after folding.

[0071] The filling port 52 is located at the end of the second fold portion 502 away from the fourth fold portion 504, allowing the filling port 52 to be positioned at the opening of the IBC for convenient filling of the inner liner bag. Preferably, the second fold portion 502 includes a first portion 5021 connected to the fourth fold portion 504 and a second portion 5022 connected to the first portion 5021. The filling port 52 is located in the second portion 5022. When folded, the second portion 5022 is positioned above the first portion 5021, with its front facing outwards. At this time, the filling port 52 is folded towards the first portion 5021, which can cover or partially cover the filling port 52, thus preventing contamination of the filling port 52 to a certain extent. More preferably, the area of ​​the first portion 5021 is comparable to the area of ​​the fourth fold portion 504.

[0072] See Figures 5-15 , Figures 5-15 The first folding method of the inner lining bag 5 is shown, through which the various folds described above can be obtained. For example... Figure 5 As shown, the inner liner bag body 51 has a first crease 511 extending along the length direction, and a second crease 512 and a third crease 513 extending along the width direction and spaced apart. To better show the front and bottom surfaces of the inner liner bag 5, two bottom markings 54 are provided on the bottom surface of the inner liner bag 5. These two bottom markings 54 are located near two corners on the side away from the filling port 52. In the figure, if the bottom marking 54 is a dashed line, it indicates that the marking is located on the back of the area shown and cannot be directly observed from the viewpoint in the figure; if it is a solid line, it indicates that the marking is located on the front of the area shown and can be directly observed from the viewpoint in the figure.

[0073] It also includes two fifth creases 515 extending from the intersection of the first crease 511 and the second crease 512 toward one edge of the width of the inner liner bag, and two sixth creases 516 extending from the intersection of the first crease 511 and the third crease 513 toward the other edge of the width of the inner liner bag. The two fifth creases 515 and the two sixth creases 516 are symmetrically arranged along the first crease 511. It also includes a seventh crease 517 extending along the length direction, located on the side near the filling port 52.

[0074] like Figure 6 and Figure 7 As shown, first fold along the second crease 512 and the third crease 513, then fold inwards to form... Figure 7The shape shown is such that the bottom surface of the corresponding part of the inner lining bag faces outwards. The second crease 512 and the third crease 513 divide the inner lining bag into three areas from left to right. The size of the three areas is determined according to the dimensions of the box, with the width of the middle area being approximately equal to the width of the base, and the widths of the left and right areas determined according to the height of the box. The second crease 512 and the third crease 513 preliminarily divide the various folds of the inner lining bag, with the first and third folds located in the left and right side areas respectively, and the second and fourth folds located in the middle area.

[0075] like Figure 8 As shown, fold inwards approximately 90° along the first crease 511, dividing the inner lining pocket into two roughly vertical sections. Figure 9 and Figure 10 As shown, the two sixth creases 516 and the first crease 511 form two triangular faces, defined as face A and face B respectively. Folding outwards along the two sixth creases 516 makes face A and face B approximately on the same plane. Simultaneously, the two fifth creases 515 and the first crease 511 also form two triangular faces, defined as face C and face D respectively. Folding outwards along the two fifth creases 515 makes face C and face D approximately on the same plane. Figure 11 As shown, through Figure 9 and Figure 10 The coordination, along the first crease 511 Figure 8 Two vertical parts overlap to form a shape like Figure 11 The structure shown has surfaces A and C covered, while surfaces B and C are on the outside, forming two triangular wings. Then fold inwards along the seventh crease 517. Figures 12-15 As shown, fold along the seventh crease 517, so that the parts on both sides of the crease are together. Fold sides B and C inward along the fifth crease 515 and the sixth crease 516 respectively, forming as shown. Figure 15 The stacking structure shown completes the folding of the inner liner bag 5. When not filled with liquid, the inner liner bag 5 can be... Figure 15 The stacked structure shown is used for storage and transfer.

[0076] See also Figure 4 and Figure 5 and the above Figures 6-14Through this folding process, the aforementioned first fold 501, second fold 502, third fold 503, and fourth fold 504 can be obtained. The first fold 501 corresponds to side B. The third fold 503 corresponds to side D. The second fold 502 and fourth fold 504 are the areas defined between the second crease 512 and the third crease 513, and are further divided into the corresponding first fold 501 and fourth fold 504 by the first crease 511. Since the first crease 511 is located slightly to the left of the center of the entire inner lining bag, the area of ​​the second fold 502 is larger than that of the fourth fold 504. Based on this, the second fold 502 is folded through the seventh crease 517 to create a first part 5021 with an area equivalent to that of the fourth fold 504, and a second part 5022 extending beyond the fourth fold 504.

[0077] See also Figure 2 When filling the inner liner bag 5, the folded inner liner bag is laid on the bottom of the unfolded IBC. At this time, the discharge valve of the inner liner bag is at the top edge of the folded inner liner and can be easily fixed with the IBC discharge port. Then, the inner liner bags are unfolded in the IBC box in the folding order until the filling port interface is reached. The side with the filling port is fixed to the inner liner support (bridge). The inner liner support (bridge) is fixed to the side wall of the IBC so that the external filling output port is placed into the filling port interface of the inner liner bag. Filling can be started to fully fill the inner liner bag. No manual adjustment of the inner liner bag is required during the process.

[0078] See Figures 16-20 , Figures 16-20 A second folding method for the inner lining bag 5 is shown, which can also be used to obtain the various folds mentioned above.

[0079] like Figure 16 As shown, the inner liner bag body 51 has a first crease 511 extending along the length direction, and a second crease 512 and a third crease 513 extending along the width direction and spaced apart. To better show the front and bottom surfaces of the inner liner bag 5, two bottom markings 54 are provided on the bottom surface of the inner liner bag 5. These two bottom markings 54 are located near two corners on the side away from the filling port 52. In the figure, if the bottom marking 54 is a dashed line, it indicates that the marking is located on the back of the area shown and cannot be directly observed from the viewpoint in the figure; if it is a solid line, it indicates that the marking is located on the front of the area shown and can be directly observed from the viewpoint in the figure.

[0080] It also includes a fourth crease 514 extending along the length direction, located on the side near the filling port 52.

[0081] like Figure 17As shown, fold clockwise 180° along the first crease 511, so that the portions on both sides of the first crease 511 are touching. Figure 18 As shown, fold counterclockwise 180° along the fourth crease 514, so that the parts on both sides of the fourth crease 514 are touching. Figure 19 As shown, fold 180° inwards along the second crease 512 and the third crease 513 respectively, forming as shown. Figure 20 The stacking structure shown completes the folding of the inner liner bag 5. When not filled with liquid, the inner liner bag 5 can be... Figure 20 The stacked structure shown is used for storage and transfer.

[0082] See Figure 21 and Figure 22 and the above Figures 16-20 Through this folding process, the first fold 501, the second fold 502, the third fold 503, and the fourth fold are obtained. The fourth fold is covered by the first fold 501 and the second fold 502. Figure 20 and Figure 21 (Not shown in the diagram). The first fold 501 is the area defined by the third fold 513, the first fold 511, and one edge of the width of the lining bag. The third fold 503 is the area defined by the second fold 512, the first fold 511, and the other edge of the width of the lining bag. The second fold 502 and the fourth fold 504 are the areas defined by the second fold 512 and the third fold 513, divided by the first fold 511 into corresponding first fold 501 and fourth fold 504. Since the first fold 511 is located slightly to the left of the center of the entire lining bag, the area of ​​the second fold 502 is larger than that of the fourth fold 504. Based on this, the second fold 502 is folded through the fourth fold 514 to create a first portion 5021 with an area equivalent to that of the fourth fold 504, and a second portion 5022 extending beyond the fourth fold 504.

[0083] See Figure 22 When filling the inner liner bag 5, the folded inner liner bag is laid on the bottom of the unfolded IBC. At this time, the discharge valve of the inner liner bag is at the top edge of the folded inner liner and can be easily fixed with the IBC discharge port. Then, the inner liner bags are unfolded in the IBC box in the folding order until the filling port interface is reached. The side with the filling port is fixed to the inner liner support (bridge). The inner liner support (bridge) is fixed to the side wall of the IBC so that the external filling output port is placed into the filling port interface of the inner liner bag. Filling can be started to fully fill the inner liner bag. No manual adjustment of the inner liner bag is required during the process.

[0084] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. An inner liner bag having a front face and a bottom face disposed opposite each other, characterized by, The inner liner bag is provided with a first fold, a second fold, a third fold and a fourth fold due to folding, and the first fold, the second fold and the third fold are connected to different sides of the fourth fold respectively.

2. The bag-in-bag of claim 1, wherein, The inner liner bag further comprises a filling port and / or a discharge port, one of which is arranged on the first fold or the third fold.

3. The bag-in-bag of claim 1, wherein, The inner liner bag further comprises a filling port and a discharge port, both of which are arranged on the bottom surface of the inner liner bag, the filling port is arranged on the second fold, and the discharge port is arranged on the first fold or the third fold.

4. The bag-in-bag of claim 3, wherein, The filling port is located at one end of the second fold away from the fourth fold.

5. The bag-in-bag of claim 4, wherein, The second fold comprises a first part connected to the fourth fold and a second part connected to the first part, and the filling port is located at the second part. In the folded state, the second part is located above the first part, and the front surface of the second part is outwardly arranged.

6. The bag-in-bag of claim 5, wherein, The area of the first part is equivalent to the area of the fourth fold.

7. The bag-in-bag of claim 1, wherein, The discharge port is arranged near the bottom where the first fold and the fourth fold are connected, or the discharge port is arranged near the bottom where the third fold and the fourth fold are connected.

8. The bag-in-bag of claim 1, wherein, The fourth fold is rectangular in shape, and the first fold and the third fold are connected to two sides of the rectangle. In the folded state, the bottom surface of the first fold and the third fold is outwardly arranged.

9. The bag-in-bag of claim 8, wherein, The first fold and the third fold both comprise a third part and a fourth part. In the folded state, the third part is located below the second fold, the fourth part is located above the second fold, and the bottom surface of the fourth part is outwardly arranged. The discharge port is arranged on the fourth part.

10. The bag-in-bag of claim 1, wherein, The inner liner bag comprises a pair of parallel and spaced creases, which divide the inner liner bag into a first region, a second region and a third region connected in turn. The first fold is located in the first region, the second fold and the fourth fold are located in the second region, and the third fold is located in the third region.

11. A method of folding an inner liner bag having a front face and a bottom face disposed opposite each other, characterized by, The inner liner bag comprises a plurality of creases, and the inner liner bag is folded into a first fold, a second fold, a third fold and a fourth fold along the creases. The first fold, the second fold and the third fold are connected to different sides of the fourth fold respectively. The following steps are performed during folding: Fold the second fold towards the fourth fold; Fold the first fold and the third fold towards the fourth fold respectively.

12. The folding method of claim 11, wherein, The inner liner bag further comprises a filling port and a discharge port, both of which are arranged on the bottom surface of the inner liner bag. The filling port is arranged on the second fold, and the discharge port is arranged on the first fold or the third fold.

13. The folding method of claim 12, wherein, When the folding is completed, the first fold or the third fold where the discharge port is arranged is located at the outermost layer.

14. The folding method of claim 11, wherein, The inner liner bag is rectangular, the creases include a first crease extending along the length direction, and a second crease and a third crease extending along the width direction and arranged at intervals, and the following steps are performed when folding: S1, folding along the first crease with the bottom surface facing outward; S2, folding along the second crease and the third crease respectively with the bottom surface facing outward; The first folding part, the second folding part, the third folding part and the fourth folding part are obtained through the above steps S1 and S2.

15. The folding method of claim 14, wherein, The creases further include a fourth crease extending along the length direction, the fourth crease is located on the side of the second folding part away from the first crease, and between steps S1 and S2, step S11 of folding along the fourth crease with the front surface facing outward is further included.

16. The folding method of claim 11, wherein, The inner liner bag includes a pair of creases arranged in parallel and at intervals, and when the inner liner bag is folded, the opposite sides of the inner liner bag are first folded towards each other along the pair of creases.

17. The folding method of claim 11, wherein, The inner liner bag is rectangular, the creases include a first crease extending along the length direction, a second crease and a third crease extending along the width direction and arranged at intervals, two fifth creases extending from the intersection of the first crease and the second crease to the edges of the width side of the inner liner bag respectively, and two sixth creases extending from the intersection of the first crease and the third crease to the edges of the width side of the inner liner bag respectively, the two fifth creases and the two sixth creases are symmetrically arranged along the first crease, and the following steps are performed when folding: S1, folding along the second crease and the third crease respectively with the bottom surface facing outward; S2, folding along the first crease to divide the inner liner bag into two parts approximately perpendicular to each other; S3, unfolding outward along the two fifth creases, and unfolding outward along the two sixth creases; S4, folding along the first crease with the bottom surface facing outward, while covering one of the fifth creases and one of the sixth creases; S5, folding along the second crease and the third crease respectively with the bottom surface facing outward; The first folding part, the second folding part, the third folding part and the fourth folding part are obtained through the above steps S1 to S5.

18. The folding method of claim 17, wherein, The creases further include a seventh crease extending along the length direction, the seventh crease is located on the side of the second folding part away from the first crease, and between steps S4 and S5, step S41 of folding along the seventh crease with the front surface facing outward is further included.

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