Pre-formed cushioning sheet, pre-formed cushioning packaging bag, and manufacturing apparatus and method

Abstract

A pre-formed cushioning sheet. A pad (31, 32) comprises a first surface (11), a second surface (12) and a sheet material (20) having slits (212) between the first surface and the second surface, wherein the slits (212) are stretched to form a cushioning layer (210); only an edge of one side of the sheet material (20) is connected to a third surface (13) and the first surface (11); and the width of the third surface (13) is greater than that of the first surface (11) and that of the sheet material (20). The present invention further relates to a cushioning packaging bag made of two cushioning sheets (30). During manufacturing, the sheet materials (20) of the two cushioning sheets (30) are non-connected to an end of each of the third surfaces (13), the sides of the two third surfaces (13) that are not connected to the sheet materials (20) are then connected to each other, and then, after cutting, the packaging bag is formed. The cushioning sheets are in a planar structure during transportation, and the slits are unfolded into a stereoscopic grid structure only when in use, such that the cushioning sheets have the cushioning performance, can be conveniently unfolded, and save on transportation costs. When a packaging bag is manufactured, there is no need to fold third surfaces, thus improving the manufacturing efficiency.

Description

Preformed cushioning sheet, preformed cushioning packaging bag, and manufacturing equipment and method Technical Field

[0001] The present invention relates to the field of express packaging, and in particular to a preformed buffer sheet, a buffer packaging bag and a manufacturing method thereof. Background Art

[0002] In the packaging field, buffer sheets primarily serve the purpose of protecting packaged items and therefore need to have a buffering function. For example, existing structures such as inflatable bubbles can provide a buffering effect. Buffer sheets are able to provide a buffering effect because they have a buffering effect in the thickness direction, but such buffer sheets are relatively thick. In this case, transportation costs are a major factor that severely restricts product costs. When buffer sheets or packaging bags made from them are shipped to other countries and regions, the thickness of the buffer sheets increases the volume of the buffer sheets. Larger buffer sheets and packaging bags incur higher transportation costs.

[0003] As shown in Figures 1 and 2, the slit area is formed by cutting on a sheet material. The slits are arranged in multiple rows, and the slits on the same row are arranged at intervals. The slits on adjacent rows are staggered with each other. Then, external tension is applied to the slits in a direction perpendicular to the slits, which can stretch and wrinkle the cut slits into a three-dimensional network structure. The three-dimensional network structure can play a buffering and protective role.

[0004] As shown in Figure 2, of course, the three-dimensional mesh structure after the slit area is stretched can also be directly wrapped around the outer surface of the object to play a buffering role, but the slit area needs to be stretched. The common stretching method during the stretching process is manual stretching. During the manual stretching process, because the pulling point is on the hand, the force is uneven, which can easily lead to only a part of the slit area being stretched and the other part not being stretched; or the slit area is damaged due to excessive tension during stretching.

[0005] Of course, the aforementioned slit areas can also be used to make packaging bags. As shown in Figure 3, packaging bags currently made using slit areas mainly involve: setting a three-dimensional mesh structure formed by stretching the slit area within a paper outer bag body, and affixing the three-dimensional mesh structure to the inner wall of the outer bag body. That is, the slit is a three-dimensional mesh structure formed after stretching, and is set within the packaging bag. This ensures the cushioning effect of the packaging bag. However, the thickness of the finished packaging bag is relatively large, making it difficult to reduce transportation costs. Furthermore, the slit area needs to be fixed to the inner wall of the outer bag body using the stretched three-dimensional mesh structure. During production, the slit area must be stretched, and the three-dimensional mesh structure must be fixed to the outer bag body without shrinking to its pre-stretched state. This makes the production process relatively complex.

[0006] As shown in Figures 4 and 5, a prefabricated cushioning bag has emerged. This refers to a prefabricated cushioning bag with a slit area placed inside the bag, not stretched out. The slit area is suspended in the air away from the bag opening. A pleated protective layer is applied to the slit area, located on the innermost surface of the bag. When items are placed in the bag, the object pushes against the protective layer, causing it to expand. This layer not only protects the integrity of the slit area during stretching and expansion, but also ensures more uniform force distribution across the slit area, preventing partial slit expansion. Most importantly, since the slit area is in an unstretched state during transportation, this type of cushioning bag is thinner and less expensive to transport. When transported to its destination, it is only stretched when items are placed, reducing transportation and storage costs. As shown in Figure 5, when the pleats are unfolded, the slit area transforms into a three-dimensional mesh structure, with its bottom contacting the bottom of the outer bag, forming a cushioning bag with sufficient cushioning capacity.

[0007] It should be noted here that in the diagram of Figure 4, there is a large space between the two folds in the cushioning packaging bag. This is only for the convenience of illustrating the position of the folds. In actual products, the internal space of the cushioning packaging bag is extremely small, and the two folds are in a state of fitting and contacting each other.

[0008] This prefabricated cushioning packaging bag also has shortcomings. When stretching the slit area, that is, pushing the protective layer toward the bottom of the bag, the folds need to be folded and stretched in the narrow space of the contacting inner wall of the cushioning packaging bag. It is relatively difficult to stretch the folds from the previous folded state to a flat surface in the narrow space, requiring greater stretching force, and it is easy to tear the folds, resulting in failure or poor stretching in the slit area.

[0009] In addition, as shown in FIG6 , when making the prefabricated cushioning packaging bag in FIG4 , the outer bag body of the cushioning packaging bag needs to be folded inward along the folding line A01 in the figure. After the cushioning packaging bag is made, it becomes the bottom of the cushioning packaging bag; then the outer bag body is folded outward along another folding line A02 above the folding line A01. After folding, the outer bag body is flattened so that both inner surfaces of the outer bag body are exposed, and the width of the folded outer bag body is correspondingly reduced; then, an inner layer with a slit area and a protective layer with wrinkles on the outer side of the inner layer are glued to the two free ends of the outer bag body along the folding line A01; after gluing, the outer bag body is folded inward along the folding line A01 so that the outer bag bodies on both sides of the folding line A01 overlap, and the two side edges of the outer bag body perpendicular to the two sides of the folding line A01 are glued. The above production process forms a prefabricated cushioning packaging bag. However, when this prefabricated cushioning packaging bag is produced on the production line, it needs to be folded. Before feeding, it needs to be folded to form a flattened outer bag body. After the outer bag body is glued, it needs to be folded again, folded in half, and glued on both sides. The production process is too complicated, especially when using automated equipment for continuous feeding. The folding action will reduce the production efficiency of the product. In addition, the folding lines A01 and A02 need to be pressed in advance before folding to create indentations.

[0010] Summary of the Invention

[0011] The object of the present invention is to provide a packaging bag, aiming to solve the technical problems in the prior art of the difficulty in unfolding the slit area of ​​the prefabricated packaging bag and the low production efficiency.

[0012] The preformed buffer sheet of the present invention comprises:

[0013] First side;

[0014] At least one layer of sheet material, each layer of the sheet material is provided with a slit area having slits, the slit area increases in length when expanded, and forms a buffer layer after the slit area is expanded, and the buffer layer has a three-dimensional grid structure;

[0015] a third surface, wherein the third surface and the first surface clamp the sheet material and are connected to one lateral edge of the sheet material along the slit direction, the third surface is not connected to the other lateral edge of the sheet material along the slit direction, and the length of the third surface perpendicular to the slit direction is greater than the length of the sheet material;

[0016] wherein the first surface is used to shield at least a portion of at least one of the sheet materials to protect the slit area of ​​the sheet material; a plurality of the sheet materials overlap each other, and the overlapping direction is such that the slits on two adjacent sheet materials are parallel to each other, and the plurality of sheet materials are connected to each other at two lateral edge positions opposite to each other along the slit direction;

[0017] One lateral edge of the first surface is connected to one lateral edge of the sheet material along the slit direction, and the other lateral edge of the first surface extends toward the other lateral edge of the sheet material.

[0018] The invention also discloses a preformed cushioning packaging bag made from the cushioning sheet material.

[0019] The packaging bag comprises: preformed buffer sheets, namely a first liner and a second liner; the sheet material of the first liner and the sheet material of the second liner are located between the third surface of the first liner and the third surface of the second liner;

[0020] The third surface of the first pad and the third surface of the second pad are connected to each other at two opposite edges perpendicular to the extending direction of the slit, forming two vertical side edges of the cushioning packaging bag; the third surface of the first pad and the third surface of the second pad are connected to each other at an edge on a side not connected to the sheet material, forming the bottom of the cushioning packaging bag;

[0021] The sheet material of the first liner and the sheet material of the second liner are connected to each other at an edge of a side not connected to the third surface; the sheet material and the two third surfaces are not connected at two vertical sides of the cushioning packaging bag.

[0022] The invention also discloses another preformed cushioning packaging bag.

[0023] The preformed cushioning packaging bag comprises: an outer bag body having a bag opening, the outer bag body comprising a bag bottom opposite to the bag opening, two side edges for connecting the bag bottom and the bag opening, a front wall and a rear wall located between the two side edges and the bag bottom and the bag opening, the front wall and the rear wall being opposite to each other, and the two side edges being located on both sides of the front wall or the rear wall respectively;

[0024] A sheet material located inside the outer bag body, the sheet material comprising:

[0025] At least one second side;

[0026] One end of the second surface in the longitudinal direction is fixed to an inner wall of the bag opening, the other end of the second surface is not connected to the front wall and the rear wall and extends toward the bag bottom, and the other end of the second surface is directly or indirectly connected to the other inner wall of the bag opening;

[0027] The second surface is provided with a slit area, the length of which increases when expanded; the slit area forms a buffer layer after expansion, and the second surface is located in the outer bag body;

[0028] When an object is placed in the cushioning packaging bag, the direction in which the object is placed is consistent with the length direction x of the sheet material, and the direction in which the object is placed is perpendicular to the width direction y of the sheet material. After the object is placed in the cushioning packaging bag, the second surface expands along the placement direction to form a cushioning layer. The cushioning layer causes the second surface to expand in the thickness direction. The cushioning layer has a three-dimensional grid structure and plays a cushioning and protective role.

[0029] The slit area includes a plurality of cutting lines arranged in columns, each cutting line includes a plurality of spaced slits 2202, and the slits on two adjacent cutting lines are staggered with each other; the slit length and cutting interval on each cutting line are the same, and when the second surface is unfolded, the slits are twisted into the three-dimensional grid structure to form the buffer layer.

[0030] The packaging bag disclosed in the present invention is made of buffer sheet material. After being made, the packaging bag has a flat structure, which can save costs during transportation. When in use, items can be directly placed in the packaging bag. Due to the gravity of the items or the thrust when the items are placed, the sheet material inside can be unfolded to form a buffer layer with a three-dimensional network structure, and the buffer layer gives the packaging bag a buffer effect. The packaging bag does not need to have the buffer layer made in the shape of a three-dimensional network structure inside the packaging bag, nor does it need to be folded. During production, only the sheet materials need to be fed together, glued, pressed, and cut, and there is no need to stretch the slit area. The production process is relatively simple. Moreover, the buffer layer can be formed on the bag body by placing items, and the packaging bag is relatively simple to use.

[0031] In particular, when an object is put in, the object contacts the first surface, and the object pushes the first surface to move toward the bottom of the bag. One end of the first surface is not connected to the second surface. Only the end of the first surface connected to the second surface drives the second surface to unfold, and the end connected to the second surface is located on the side of the bag bottom. Compared with the prefabricated packaging bags in the prior art, there is no need to set folds on the first surface, nor is there any need to unfold the folds in the narrow space in the packaging bag, so the second surface can be unfolded more conveniently.

[0032] In addition, the first surface can also protect the second surface when unfolding, preventing the second surface from breaking, and can also make the force on the second surface more uniform when unfolding.

[0033] The present invention also discloses a method for manufacturing a preformed cushioning packaging bag, the method comprising:

[0034] Step S1: preparing a preformed buffer sheet, the preformed buffer sheet comprising a third surface and a sheet material, the sheet material being provided with a plurality of slits, one side edge of the sheet material along the direction of the slits being connected to one side edge of the third surface, the other side edge of the sheet material being disconnected from the third surface, and both side edges of the sheet material perpendicular to the direction of the slits being disconnected from the third surface;

[0035] Step S2: synchronously and continuously feeding the two preformed buffer sheets, the two preformed buffer sheets being a first liner and a second liner respectively, so that the sheet materials of the two preformed buffer sheets are opposite to each other and the sheet material is located between the third surfaces of the two preformed buffer sheets;

[0036] Step S3: Gluing the two preformed cushioning sheets at locations where they are to be connected, and pressing the glued locations together, so that: the third surface of the first liner and the third surface of the second liner are connected at a spacing S perpendicular to the direction in which the slit extends, and after cutting at the spacing S, the two vertical sides of the prefabricated cushioning packaging bag are formed; and the third surface of the first liner and the third surface of the second liner are connected to each other at an edge on a side not connected to the sheet material, forming the bottom of the cushioning packaging bag;

[0037] The sheet material of the first liner and the sheet material of the second liner are connected to each other at an edge of a side not connected to the third surface; the sheet material and the two third surfaces are not connected at two vertical sides of the cushioning packaging bag;

[0038] Step S4: cutting the intervals S perpendicular to the feeding direction to form a plurality of preformed cushioning packaging bags separated along the feeding direction.

[0039] The invention also discloses a preformed cushioning packaging bag manufacturing device, which is used for manufacturing the preformed cushioning packaging bag according to the packaging bag manufacturing method.

[0040] Through such production, it can be seen that the third side of the outer bag body does not need to be folded, which is beneficial to improving production efficiency. In addition, the production of preformed buffer sheets and preformed buffer packaging bags can be completed on the same conveyor line, without the need for transferring materials, and the same conveyor line has the same feeding rate, ensuring that the same feeding speed is achieved from the feeding of the second and third sides to the production of two preformed buffer sheets, and then to the production of preformed buffer packaging bags from the two preformed buffer sheets. It is particularly easy to achieve alignment at the interval S during feeding, that is, the interval S on the third side of the first pad and the interval S on the third side of the other second pad are all aligned during the feeding process. Only one equipment debugging is required to achieve alignment of all the intervals S at the front end and the back end, which is convenient for pressing, fixing, and cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a schematic diagram of the structure of the slit area;

[0042] FIG2 is a schematic diagram of a three-dimensional grid structure after the slit area is stretched;

[0043] Figure 3 is a schematic diagram of the structure of an existing packaging bag;

[0044] FIG4 is a schematic structural diagram of a conventional preformed packaging bag with pleats;

[0045] FIG5 is a schematic structural diagram of the conventional packaging bag of FIG4 when in use;

[0046] FIG6 is a schematic diagram of the conventional packaging bag manufacturing process of FIG5

[0047] FIG7 is a schematic structural diagram of a packaging bag of the present invention;

[0048] FIG8 is a schematic diagram of the sheet material structure of the second side;

[0049] FIG9 is a schematic diagram of a sheet material with two layers of the second surface;

[0050] Figure 10 is a schematic structural diagram of a packaging bag;

[0051] FIG11 is a schematic structural diagram of a buffer sheet;

[0052] FIG12 is a schematic structural diagram of a packaging bag made of the buffer sheet of FIG11;

[0053] FIG13 is a schematic diagram of the manufacturing process of the buffer sheet of FIG11;

[0054] FIG14 is a schematic diagram of a manufacturing process of a packaging bag using a buffer sheet;

[0055] Figure 15 is a schematic diagram of another packaging bag structure;

[0056] FIG16 is a schematic diagram of the packaging bag manufacturing process of FIG15;

[0057] Figure 17 is a schematic diagram of another buffer sheet structure;

[0058] FIG18 is a schematic diagram of another buffer sheet structure;

[0059] FIG19 is a schematic diagram of a back side split of the buffer sheet of FIG18;

[0060] FIG20 is a schematic diagram of the buffer sheet manufacturing process of FIG18;

[0061] FIG21 is a schematic diagram of a process for making a packaging bag from the buffer sheet of FIG18;

[0062] Figure 22 is a cross-sectional view of the packaging bag produced in Figure 21. 10. Outer bag body; 10a. Bag opening; 10b. Bag bottom; 10c. Two side edges; 10d. Front wall; 10e. Back wall; 11. First side; 12. Second side; 13. Third side; 20. Sheet material; 21. Slit area; 210. Cushioning layer; 211. Cutting line; 212. Slit; 213. Opening; 214. Bevel edge; 30. Cushioning sheet; 31. First liner; 32. Second liner; DETAILED DESCRIPTION

[0063] The present invention will be further described and explained below in conjunction with specific embodiments and accompanying drawings:

[0064] As shown in FIG7 , a preformed cushioning packaging bag 100 of the present invention includes:

[0065] 1. Outer bag 10

[0066] The outer bag body 10 can be formed by gluing and sealing the three sides of the third surface 13, and reserving a bag opening 10a; wherein the outer bag body 10 includes a bag bottom 10b relative to the bag opening 10a, two side edges 10c for connecting the bag bottom 10b and the bag opening 10a, a front wall 10d and a rear wall 10e located between the two side edges 10c and the bag bottom 10b, and the bag opening 10a, the front wall 10d and the rear wall 10e are opposite to each other, and the two side edges 10c are respectively located on both sides of the front wall 10d or the rear wall 10e.

[0067] 2. Sheet materials 20

[0068] 8 , in the present invention, the sheet material 20 is located inside the outer bag body 10 and is composed of a second surface 12 having a slit area 21; the slit area 21 includes a plurality of cutting lines 211 arranged in columns on the second surface 12, and each cutting line 211 includes a plurality of spaced slits 212, and the slits 212 on two adjacent cutting lines 211 are staggered with each other; the length and cutting interval of the slits 212 on each of the cutting lines 211 are the same, and when the second surface 12 is unfolded, the slits 212 are twisted into openings 213, becoming a three-dimensional grid structure, thereby forming the buffer layer 210.

[0069] 7 to 9 , in some embodiments, optionally: the sheet material 20 has multiple layers, and each layer of the sheet material 20 optionally has multiple second surfaces 12 ;

[0070] The slits 212 in the sheet material 20 are arranged in the outer bag body 10 in an unstretched state. When items are placed in the bag, the sheet material 20 is stretched to form the buffer layer 210 .

[0071] The preformed cushioning packaging bag 100 manufactured in the present invention is primarily used for express packaging, postal bags, and envelopes. The dimensions of this preformed cushioning packaging bag 100 are generally within 80cm by 60cm, with a typical size of 10cm by 15cm. This preformed cushioning packaging bag 100 can be made entirely of paper, with the third surface 13 of the outer bag body 10a and the second surface 12 of the sheet material 20 both being made of paper, particularly preferably stretch paper or kraft paper. When the second surface 12 is made of a paper material weighing 40-85g / m², the preformed cushioning packaging bag 100 is lightweight while maintaining its packaging strength and cushioning performance. When the second surface 12 is made of a paper material less than 40g / m2, after being stretched into the cushioning layer 210, the plasticity of the second surface 12 decreases due to its low thickness. That is, the cushioning layer 210 after being stretched will change to the slit state of the plane before being stretched, resulting in a reduction in cushioning performance. Furthermore, as the thickness of the second surface 12 decreases, the ability of the three-dimensional grid structure to withstand pressure is correspondingly reduced, further reducing cushioning performance. When the second surface 12 is made of a paper material greater than 85g / m2, due to the increased thickness, when the second surface 12 of such a thickness is placed in the outer pocket 10a, it is difficult to push the slit area 21 open when inserting an object. In other words, the stretching force required to push the slit area 21 open to form the three-dimensional grid structure is greater. Manually inserting an object while simultaneously stretching the second surface 12 into the three-dimensional grid structure is difficult, and auxiliary equipment is required to first open the slit area 21 to form the three-dimensional grid structure before inserting the object, which is relatively inconvenient.

[0072] In the present invention, when the second surface 12 having the slit area 21 is used in express packaging or envelope bags, the length of the slit 212 is preferably no greater than 1.5 cm, and the distance between two adjacent cutting lines 211 is less than 0.4 cm. In this case, the number of slits 212 per unit area on the second surface 12 is relatively large, and the cutting density of the slits 212 is relatively high. After the buffer layer 210 is stretched and expanded into a three-dimensional grid, the number of twisted openings 213 per unit area is relatively large, and the twisted openings 213 are inclined relative to the plane where the original slits 212 are located. Therefore, the number of oblique edges 214 of the inclined openings 213 per unit area is also relatively large. The densely inclined oblique edges 214 can provide stronger support, and the buffering performance is better than that of slits 212 with a length greater than 1.5 cm and a row spacing greater than 0.4 cm. Moreover, after the planar slit area 21 is stretched into the buffer layer 210, the row spacing is less than 0.4 cm, so the thickness of the buffer layer 210 is relatively small, which will not cause the bag thickness of the preformed cushioning packaging bag 100 to increase excessively, and can save costs during transportation.

[0073] In the present invention, when the second surface 12 is made of a paper material of 40-85g / m2, and the length of the slit 212 is 1.5cm and the row spacing of the slit 212 is 0.4cm during cutting, after the slit area 21 is expanded to form the buffer layer 210, the increased length of the buffer layer 210 is between 0.2 and 1 times the length of the original slit area 21. That is to say, with a smaller tensile force, the second surface 12 with the slit area 21 can be stretched to 1.2 times the original length, meeting basic usage requirements; and when the tensile force is increased accordingly, it can be ensured that the second surface 12 is stretched to twice the original length. At this time, the buffer layer 210 stretched by the slit area 21 will still not fail or break, and can continue to be used as a buffer layer 210.

[0074] 3. First side 11 (optional)

[0075] In some embodiments, as shown in FIG10 , the preformed cushioning packaging bag 100 may optionally further include a first surface 11 , which is configured to shield at least a portion of at least one of the sheet materials 20 to protect a slit area 21 of the sheet material 20 and prevent damage to the sheet material 20 when an object is placed on one side of the sheet material 20 and stretched.

[0076] In the present invention, relatively sharp objects do not directly contact the sheet material 20, which can protect the sheet material 20 while stretching it. In addition, the object that pushes the sheet material 20 to move to drive the slit area 21 to expand can directly act on the first surface 11, and then the first surface 11 acts on the sheet material, which is conducive to dispersing the stretching force and preventing the sheet material 20 from being damaged during the stretching process; moreover, when the object is put in and pushes the sheet material 20 to expand, there will be no problem of wrinkles in the narrow space inside the outer bag body 10 that cannot be folded open, thereby making it more convenient to open the buffer layer 210 into a three-dimensional mesh structure.

[0077] When the preformed cushioning packaging bag 100 has a first surface 11, the first surface 11 is connected to the sheet material 20 only along one side edge in the slit direction. When a tensile force perpendicular to the slit direction pushes the slit area 21 toward the bag bottom 10b of the outer bag body 10, the first surface 11 can serve as a guide, allowing an article or a structure such as a push rod that pushes the slit 212 to expand to move along the first surface 11 to the bottom of the sheet material 20 without generating wrinkles that need to be folded. This also facilitates the slit area 21 to open into the cushioning layer 210.

[0078] The following describes in detail different implementation methods.

[0079] Implementation method one:

[0080] Referring to Figures 10 and 11 , the present invention first discloses a preformed cushioning packaging bag 100. The preformed cushioning packaging bag 100 includes a cushioning sheet 30, which is formed by the cushioning sheet 30. The cushioning sheet 30 comprises an outer bag body 10 formed of a third surface 13 and a sheet material 20 located within the outer bag body 10. The sheet material 20 includes at least one second surface 12, and the second surface 12 is provided with the slit 212.

[0081] Among them, one end 12a of the second surface 12 in the longitudinal direction x is fixed to an inner wall of the bag opening 10a, the other end 12b of the second surface 12 is not connected to the front wall 10d and the rear wall 10e and extends toward the bag bottom 10b, and the other end 12b of the second surface 12 is directly or indirectly connected to the other inner wall of the bag opening 10a.

[0082] As shown in FIG12 , a slit area 21 is provided on the second surface 12 , and the length of the slit area 21 increases when it is unfolded; the slit area 21 forms a buffer layer 210 after being unfolded, and the second surface 12 is located inside the outer bag body 10 ;

[0083] When an object is placed in the preformed cushioning packaging bag 100, the direction in which the object is placed is aligned with the length direction x of the sheet material 20 and perpendicular to the width direction y of the sheet material 20, which is also the direction in which the slits 212 extend. After the object is placed, the second surface 12 expands in the placement direction to form a cushioning layer 210. This cushioning layer 210 causes the second surface 12 to expand in the thickness direction. The cushioning layer 210 has a three-dimensional grid structure, providing cushioning and protection.

[0084] Direct connection refers to the other end 12b of the second surface 12 extending toward the bag bottom 10b, then flipping over and extending toward the bag opening 10a, connecting to the other inner wall of the bag opening 10a along the vicinity of the bag opening 10a. In this case, after the second surface 12 is secured, when an object is placed into the preformed cushioning packaging bag 100 through the bag opening 10a, the object first acts on the second surface 12 having the slit area 21. This pushes the slit area 212 perpendicularly toward the bag bottom 10b, twisting the slit 212 into a three-dimensional opening, thereby forming the cushioning layer 210.

[0085] In this embodiment, one end portion 12b of the second surface 12 may also be indirectly connected to the other inner wall of the bag opening 10a.

[0086] For example:

[0087] A. There are two second surfaces, as shown in FIG12 ; one end 12a of the first second surface 12 in the longitudinal direction is fixed to an inner wall of the bag opening 10a, and the other end 12b of the first second surface 12 is not connected to the front wall 10a or the rear wall 10e and faces the bag bottom 10b;

[0088] One end 12a of the second second surface 12 in the longitudinal direction is fixed to the other inner wall of the bag opening 10a, and the other end 12b of the second second surface 12 is connected to the other end 12b of the first first surface 12.

[0089] In this way, each second surface 12 is not directly connected to the two inner walls of the bag opening 10a, and one side end 12b of one second surface 12 facing the bag bottom 10b is connected to another second surface 12, and is connected to the other inner wall of the bag opening 10a through the other second surface 12.

[0090] In this manner, the two second surfaces 12 after being spliced ​​together are still equivalent to the structure of only one second surface 12 . After an object is placed therein, the two second surfaces 12 can also be unfolded into a buffer layer 210 with a three-dimensional grid structure.

[0091] When manufacturing a preformed cushioning packaging bag 100, a structure in which only one sheet material 20 is connected to a third surface 13 can be considered a preformed cushioning sheet 30. This is different from a structure in which only one second surface 12 is connected at both ends to the two inner walls of the bag opening 10a. When reusing the preformed cushioning sheet 30 to manufacture the preformed cushioning packaging bag 100, the outer bag body 10 no longer needs to be folded, meaning that the third surface 13 does not need to be folded on the production line.

[0092] As shown in Figure 13, specifically, the third surface 13 can be unwound along the extension direction of the slit 212, that is, the width direction y, which is also the feeding direction, and the length of the unwound third surface 13 perpendicular to the feeding direction is greater than the length of the second surface 12 in the same direction. At the same time, when unwinding the third surface 13, glue is applied at intervals on the third surface 13 perpendicular to the feeding direction, that is, along the length direction x, and glue is applied near two opposite lateral edges (13a, 13b) of the third surface 13 along the feeding direction; then, a second surface 12 is continuously unwound in the same direction above the third surface 13, and the second surface 12 is brought into contact with the third surface 13; a lateral edge 12a of the second surface 12 along the feeding direction is brought into contact with a lateral edge 13a of the third surface 13 after glue is applied. a contact; allow the second surface 12 and the third surface 13 to be conveyed together; while unwinding together, each time the second surface 12 is conveyed to the position S corresponding to the third surface 13 where glue is applied at intervals, the second surface 12 is cut along the length direction x, and the cut second surface 12 is in a state of pieces. The pieces of second surface 12 are continuously fed as the third surface 13 is pasted on the third surface 13 at intervals S, and one side edge 12a of the second surface 12 is connected to the side edge 13a of the third surface 13 where glue has been applied; the distance S is the position S on the third surface 13 where glue is applied at intervals; then, or while the second surface 12 is being unwound synchronously, glue is applied to the other side edge 12b of the second surface 12 that is not connected to the third surface 13 along the feeding direction. At this point, a preformed buffer sheet 30 is first produced.

[0093] In addition to being used to make preformed cushioning packaging bags 100, such preformed cushioning sheet 30 can also be used independently. When used independently, the side edge 12b of the second surface 12 not connected to the third surface 13 is pulled away from the connected end 12a, thereby unfolding the second surface 12 into a three-dimensional grid-structured cushioning layer 210. The glued end 12b of the second surface 12 not connected to the third surface 13 is then adhered to the side edge 13b of the third surface 13, forming a preformed cushioning sheet 30 with cushioning properties. During transportation, the second surface 12 of such a preformed cushioning sheet 30 is in a flat, unstretched state and can be rolled or stacked. When used, it can be stretched to transform the preformed cushioning sheet 30 into a cushioning layer 210 and wrapped around an item or filled in a packaging box.

[0094] As shown in FIG14 , when the preformed cushioning sheet 30 is used to make the preformed cushioning packaging bag 100:

[0095] Two preformed buffer sheets 30 are fed on the same conveyor line. Of course, the production of the preformed buffer sheets 30 can also be completed on this conveyor line. The preformed buffer sheets 30 are produced at the front end of the conveyor line, and the two preformed buffer sheets 30 are stacked up and down along the conveyor line and transported to the rear end together; we name these two preformed buffer sheets 30 as the first liner 31 and the second liner 32 respectively; when feeding, the sheet materials 20 of the two first liners 31 and the second liners 32 are opposite to each other, and the sheet material 20 is located between the third surfaces 13 of the two preformed buffer sheets (31, 32).

[0096] The two preformed cushioning sheets (31, 32) are pressed together at positions where they need to be connected, so that: the third surface 13 of the first liner 31 and the third surface 13 of the second liner 32 are connected at a spacing S position perpendicular to the extension direction of the slit 212, and after cutting at the spacing S position, two vertical side edges 10c of the preformed cushioning packaging bag 100 are formed; the third surface 13 of the first liner 31 and the third surface 13 of the second liner 32 are connected to each other at a side edge 13b not connected to the sheet material 20, forming a bag bottom 10b of the preformed cushioning packaging bag 100;

[0097] The sheet material 20 of the first liner 31 and the sheet material 20 of the second liner 32 are connected to each other at a side edge 12b not connected to the third surface 13, forming a bottom facing the bag bottom 10b; the sheet material 20 and the two third surfaces 13 are not connected at the two vertical side edges 10c of the preformed cushioning packaging bag.

[0098] Then, the preformed cushioning packaging bags 100 are cut at intervals S perpendicular to the feeding direction to form preformed cushioning packaging bags 100 separated along the feeding direction.

[0099] Through such production, it can be seen that the third surface 13 forming the outer bag body 10 does not need to be folded, which is beneficial to improving production efficiency. In addition, the production of the preformed buffer sheet 30 and the preformed buffer packaging bag 100 can be completed on the same conveyor line, without the need for transferring materials, and the same conveyor line has the same feeding rate, ensuring that the feeding of the second surface 12 and the third surface 13 to the production of two preformed buffer sheets 30, and then to the production of the preformed buffer packaging bag 100 from the two preformed buffer sheets 30 all have the same feeding speed, and it is particularly easy to achieve alignment at the interval S during feeding, that is, the interval S on the third surface 13 of the first liner 31 and the interval S on the third surface 13 of the other second liner 32 are all aligned during the feeding process, and only one equipment debugging is required to achieve alignment of all the intervals S at the front end and the rear end, which is convenient for pressing, fixing, and cutting.

[0100] In this embodiment, one end portion 22b of the second surface 12 may also be indirectly connected to the other inner wall of the bag opening 10a.

[0101] For example, as shown in Figure 15:

[0102] B. The preformed cushioning packaging bag 100 further includes a first surface 11 and two second surfaces 12 .

[0103] One end 12a of the first second surface 12 in the longitudinal direction is fixed to an inner wall of the bag opening 10a, the other end 12b of the first second surface 12 is not connected to the front wall 10d or the rear wall 10e and extends toward the bag bottom 10b, and the other end 12b of the first second surface 12 is connected to the first surface 11; one end 12a of the second second surface 12 in the longitudinal direction is fixed to the other inner wall of the bag opening 10a, and the other end 12b of the second second surface 12 is connected to the first surface 11.

[0104] In this manner, the two second surfaces 12 are connected together at an edge of a side close to the bag bottom through the first surface, thereby achieving indirect connection.

[0105] Preferably, the first surface 11 is located on a side of the second surface 12 facing away from the outer bag body 10 , and the first surface 11 is used to shield the second surface 12 or a portion of the second surface 12 .

[0106] Of course, in this method, the two second surfaces 12 connected to the first surface 11 are still equivalent to a structure with only one second surface 12 after being spliced ​​together. After placing an object, the two second surfaces 12 can also be unfolded to form a three-dimensional grid-structured cushioning layer 210. However, compared to only one second surface 12, with both ends (12a, 12b) of the second surface 12 connected to the two inner walls of the bag opening 10a, the difference is that when using the preformed cushioning sheet 30 to manufacture the preformed cushioning packaging bag 100, it is no longer necessary to fold the outer bag body 10, that is, there is no need to fold the third surface 13 on the production line.

[0107] As shown in Figure 16, it is basically the same as the above-mentioned production method A, except that when two pre-formed buffer sheets 30, namely the first liner 31 and the second liner 32 are stacked up and fed synchronously, it is necessary to feed a layer of first surface 11 synchronously between the first liner 31 and the second liner 32, and the fed first surface 11 is a structure that is folded only once along the feeding direction y, and the folding line 11a of the first surface 11 is fixed on the side edge 12b of the sheet material 20 that is not connected to the third surface 13 towards the position of the two side edges. More specifically, the sheet material 20 of the first liner 31 is fed upwardly and the first liner 31 is fed on the conveyor line. At this time, the sheet material 20 is arranged at intervals S on the third surface 13 of the first liner 31; and then the first surface 11 folded along the feeding direction is synchronously fed above the first liner 31. When the first surface 11 is synchronously fed to the position corresponding to the interval S on the third surface 13 each time, the first surface 11 is cut perpendicular to the feeding direction y, and the first surface 11 and the sheet material 20 not connected to the third surface 13 are cut along the feeding direction, also along the slit. Then, at the rear end of the first liner 31 connected to the first surface 11, the second liner 32 is fed from above synchronously with the first liner 31, and it is ensured that the interval S of the first liner 31 and the interval S of the second liner 32 are opposite to each other. Then, the one side edge 13b of the two opposite third surfaces 13 not connected to the sheet material 20 with the interval S, and the sheet material 20 of the first surface 11 and the second liner 32 are pressed together at the one side edge 13b not connected to the third surface 13, and connected to form the preformed cushioning packaging bag 100.

[0108] In this method, it can be seen that the first surface 11 is only folded once, and the third surface 13 does not need to be folded. After being folded once, the first surface 11 can be fixed to two preformed buffer sheets 30 respectively while making the preformed buffer sheet 30. The production is convenient and simple, which is conducive to improving production efficiency.

[0109] Implementation Method 2

[0110] As shown in FIG17 , in this embodiment, the preformed cushioning packaging bag 100 also includes two preformed cushioning sheets 30 , and the preformed cushioning sheets 30 include:

[0111] First side 11;

[0112] At least one layer of sheet material 20, each layer of the sheet material 20 is provided with a slit area 21 having slits 212, the slit area 21 increases in length when expanded, and forms a buffer layer 210 after the slit area 21 is expanded, and the buffer layer 210 has a three-dimensional grid structure;

[0113] The third surface 13, the third surface 13 and the first surface 11 clamp the sheet material 20, the third surface 13 is connected to the sheet material 20 at a lateral edge 13a along the slit direction, and the third surface 13 is not connected to the other lateral edge 13b of the sheet material 20 along the slit direction. The length of the third surface 13 perpendicular to the slit direction is greater than the length of the sheet material 20, and the two side edges 20c of the sheet material 20 perpendicular to the slit direction are not connected to the third surface 13; a lateral edge 11a of the first surface 11 is connected to a lateral edge 20a of the sheet material along the slit direction, and the other lateral edge 11b of the first surface 11 extends toward the other lateral edge 20b of the sheet material 20.

[0114] The first surface 11 is used to shield at least a portion of at least one sheet material 20 to protect the slit area 21 of the sheet material 20 .

[0115] In this embodiment, the sheet material 20 may optionally have multiple layers. When the sheet material 20 has multiple layers, the sheet materials 20 overlap with each other, and the overlapping direction makes the slits on two adjacent sheet materials 20 parallel to each other, and the multiple sheet materials 20 are connected to each other at two lateral edges 20c opposite to each other along the slit direction; that is, multiple sheet materials 20 form a multi-layer structure, and each layer is provided with a slit area 21 facing the same direction. When the multi-layer sheet material 20 is stretched and expanded, a multi-layer buffer layer 210 is formed. Compared with a single buffer layer 210, the multi-layer buffer layer 210 has better buffering performance; and the stacked structure can make at least a part of the twisted three-dimensional openings 213 in the multi-layer buffer layer 210 bite into each other, or nest with each other, which can better prevent the buffer layer 210 from shrinking to the planar slit 212 state, and is also conducive to improving the buffering performance.

[0116] In this embodiment, the sheet material 20 includes at least one second surface 12, and the slit area 21 is provided on the second surface 12. When the sheet material 20 comprises only multiple layers of second surfaces 12, the third surface 13 is provided on one outermost surface of the multi-layer sheet material 20, while the first surface 11 is provided on another surface of the multi-layer sheet material 20. Similarly, the first surface 11 and the third surface 13 sandwich the multi-layer sheet material 20.

[0117] In this embodiment, adhesive is provided on the non-connected side edges 13 b of the third surface 13 and the sheet material 20 along the slit direction to fix the edge 20 b of the sheet material 20 after the sheet material 20 is stretched into the buffer layer 210 .

[0118] In addition to being used to make preformed cushioning packaging bags 100, this preformed cushioning sheet 30 can also be used independently. When used independently, the edge 20b of one or more layers of sheet material 20 not connected to the third surface 12 is pulled away from the connected end 20a, thereby unfolding the second surface 12 into a three-dimensional grid-structured cushioning layer 210. The glued end 20b of the sheet material 20 not connected to the third surface 13 is then adhered to the edge 13b of the third surface 13, forming a preformed cushioning sheet 30 with cushioning properties. During transportation, the one or more layers of sheet material 20 remain in a flat, unstretched state and can be rolled or stacked. When used, they are stretched and transformed into a preformed cushioning sheet 30, which can be wrapped around an item or filled in a packaging box.

[0119] As shown in Figure 18 , in a preferred embodiment, there are two first surfaces 11, each of which is connected to the same sheet material 20 and located on the same side of the sheet material 20, also on the side facing away from the third surface 13. The two first surfaces 11 are respectively connected to two opposing lateral edges 11a of the sheet material 20. That is, one first surface 11 is connected to one side edge 20a of the sheet material 20, and the other first surface 11 is connected to the other side edge 20b of the same sheet material 20. The unconnected side edge 11b of either first surface 11 extends toward the other first surface 11, and during this extension, at least a portion of the two first surfaces 11 overlap, forming a first overlapping region 110. The two first surfaces 11 in this first overlapping area 100 are not connected. During the stretching process of the sheet material 20, the two first surfaces 11 move away from each other, so that the area of ​​the first overlapping area 110 is reduced. The first overlapping area 110 provides a movement margin space for the stretching of the sheet material 20. After the sheet material 20 is stretched into the buffer layer 210, the two first surfaces 11 preferably completely cover the buffer layer 210, which can protect the entire buffer layer 210. At this time, the items to be packaged will not directly contact the buffer layer 210, but will contact the two first surfaces 11 covering one side of the buffer layer 210. On the one hand, the items will not cause damage to the buffer layer 210 with the twisted opening 213, and on the other hand, the twisted opening 213 will not scratch the packaged items.

[0120] Among them, after the second surface 12 of the sheet material 20 is stretched, the length of the second surface 12 increases, but the width of the second surface 12 will be reduced accordingly. Since the position of the reduced width of the second surface 12 is not covered by the buffer layer 210, it will lead to poor buffering effect.

[0121] As shown in Figure 19, in this embodiment, at least one layer of the multilayer sheet material 20 includes at least two second surfaces 12, and multiple second surfaces 12 are arranged on the third surface 13 in a direction perpendicular to the slit. Two adjacent second surfaces 12 overlap with each other to form a second overlapping area 120. Multiple second surfaces 12 of the same sheet material 20 are connected to each other at the two side edges (12a, 12b) along the slit direction or are connected to each other in the second overlapping area 120. The area of ​​the second overlapping area 120 is reduced when the second surface 12 is unfolded.

[0122] The same sheet material 20 is formed by connecting two or more second surfaces 12, and the connection locations are at the two side edges (12a, 12b) along the slit direction, coinciding with the connection locations of the first surface 11. When the sheet material 20 is stretched and expanded into the buffer layer 210, the two second surfaces 12 can be expanded simultaneously without affecting each other. Moreover, after the second surface 12 of the same sheet material 20 is expanded, the reduced width of the buffer layer 210 is covered by another sheet material 20. This can reduce the area of ​​the sheet material 20 that is exposed and not covered by the buffer layer 210, thereby increasing the buffer protection range of the entire sheet material 20.

[0123] Of course, when the preformed cushioning sheet 30 is used to make the preformed cushioning packaging bag 100:

[0124] As shown in FIG20 , a preformed buffer sheet 30 is produced;

[0125] As shown in FIG21 and in combination with FIG7 , two preformed buffer sheets 30 are continuously fed synchronously, and the two preformed buffer sheets 30 are respectively a first liner 31 and a second liner 32, so that the sheet materials 20 of the two preformed buffer sheets (31, 32) are opposite to each other, and the sheet material 20 is located between the third surfaces 13 of the two preformed buffer sheets (31, 32);

[0126] Gluing is applied to the positions where the two preformed cushioning sheets (31, 32) need to be connected, and the glued positions are pressed, so that: the third surface 13 of the first liner 31 and the third surface 13 of the second liner 32 are connected at a spacing S position perpendicular to the extending direction of the slit, and after cutting at the spacing S position, two vertical side edges 10c of the preformed cushioning packaging bag 100 are formed; the third surface 13 of the first liner 31 and the third surface 13 of the second liner 32 are connected to each other at a side edge 13b not connected to the sheet material 20, forming the bag bottom 10b of the preformed cushioning packaging bag 100;

[0127] The sheet material 20 of the first liner 31 and the sheet material 20 of the second liner 32 are connected to each other at a side edge 20b that is not connected to the third surface 13; the sheet material 20 and the two third surfaces 13 are not connected at two vertical sides 10c of the preformed cushioning packaging bag 100;

[0128] The intervals S are cut perpendicularly to the feeding direction to form a plurality of preformed cushioning packaging bags 100 separated along the feeding direction, as shown in FIG22 .

[0129] This embodiment differs from the first embodiment in the preparation of the preformed buffer sheet 30, specifically:

[0130] As shown in FIG20 , the method for manufacturing the preformed buffer sheet 30 includes:

[0131] Unwinding the third side 13;

[0132] unwinding at least one layer of the second surface 12 so that the second surface 12 is located above the third surface 13, and the width of the third surface 13 perpendicular to the feeding direction is greater than the width of the second surface 12 perpendicular to the feeding direction; when unwinding the second surface 12, the second surface 12 close to the third surface 13 is connected to the third surface 13 at a side edge 12a along the feeding direction; the plurality of second surfaces 12 unwound synchronously are stacked on top of each other, the plurality of second surfaces 12 are connected to each other at both side edges (12a, 12b) along the feeding direction, and the plurality of second surfaces 12 connected to each other form a sheet material 20; a gap S is provided at the position where the second surface 12 or the sheet material 20 is connected to the third surface 13;

[0133] One or two first surfaces 11 are unrolled, wherein the width of the first surface 11 perpendicular to the feeding direction is smaller than the width of the second surface 12; the unrolled first surface 11 is located above the second surface 12 or the sheet material 200; when unrolling one first surface 11, a side edge 12a of the first surface 11 along the feeding direction is connected to a side edge (12a, 20a) of the second surface 12 or the sheet material 20 along the feeding direction.

[0134] When unwinding the two first surfaces 11, one first surface 11 is connected to a side edge (12a, 20a) of the second surface 12 or the sheet material 20 at a side edge 11a along the feeding direction, and the other first surface 11 is connected to the other side edge (12b, 20b) of the second surface 12 or the sheet material 20 at a side edge 11b along the feeding direction; wherein, the edge 11b of the first surface 11 not connected to the second surface 12 or the sheet material 20 extends toward the other side edge (12b, 20b) of the second surface 12 or the sheet material 20; the two first surfaces 11 are overlapped at positions not connected to the second surface 12 or the sheet material 20 to form a first overlapping area 110; the edges of the first surface 11 perpendicular to the feeding direction are not connected to the third surface 13;

[0135] When unwinding the third surface 13, glue is applied at the interval S on the third surface 13 perpendicular to the feeding direction; when unwinding the second surface 12, glue is applied on the surface of the second surface 12 that is not connected to the third surface 13 along the feeding direction and is away from the third surface 13.

[0136] Through such production, it can be seen that the third surface 13 forming the outer bag body 10 does not need to be folded, which is beneficial to improving production efficiency. In addition, the production of the preformed buffer sheet 30 and the preformed buffer packaging bag 100 can be completed on the same conveyor line, without the need for transferring materials, and the same conveyor line has the same feeding rate, ensuring that the same feeding speed is achieved from the feeding of the second surface 12 and the third surface 13 to the production of two preformed buffer sheets 30, and to the production of the preformed buffer packaging bag 100 from the two preformed buffer sheets 30. In particular, it is easy to achieve alignment of the intervals S during feeding, that is, the intervals S on the third surface 13 of the first liner 31 and the intervals S on the third surface 13 of the other second liner 32 are all aligned during the feeding process. Only one equipment debugging is required to achieve alignment of all the intervals S at the front end and the rear end, which is convenient for pressing, fixing, and cutting.

[0137] In addition, in this embodiment, when each sheet material 20 has two second surfaces 12, and the two second surfaces 12 are stacked with a second overlapping area 120, when making such a preformed buffer sheet 30, when the second surface 12 is fed to the interval S on the third surface 13, the second surface 12 is cut for the first time perpendicular to the feeding direction, and the second surface 12 is sequentially pasted on the third surface 13 at one side edge along the slit direction as the third surface 13 is fed; as the second surface 12 is fed to between the two intervals S on the third surface 13, the second surface 12 is cut perpendicular to the feeding direction. The second surface 12 is cut in the feeding direction for a second time, and then the second surface 12 is fed for a short time at a faster speed than the third surface 13. After the end of the second surface 12 cut for the second time is stacked on the rear end of the second surface 12 cut for the first time, the second surface 12 is fed synchronously with the third surface 13 again, and the second surface 12 cut for the second time is sequentially attached to the third surface 12 along one side edge of the slit direction; until the second surface 12 is fed to the next interval S, the second surface 12 is cut for the third time; at this point, the two pieces of the second surface 12 are sequentially attached to the third surface 13 between the two intervals S. The other methods for making the preformed buffer sheet 30 are no different from those in this embodiment.

[0138] When manufacturing the preformed cushioning packaging bag 100 of the present application, a preformed cushioning sheet 30 is first manufactured, and then the preformed cushioning packaging bag 100 is manufactured using two preformed cushioning sheets 30. During the entire process, the preformed cushioning packaging bag 100 is fed on a single conveyor line, which is beneficial to improving the feeding rate of the conveyor line. In addition, the third surface 13 forming the outer bag body 10 does not need to be folded multiple times, which is also beneficial to improving the manufacturing efficiency.

[0139] The invention also discloses a preformed cushioning packaging bag manufacturing device, which is used for manufacturing the preformed cushioning packaging bag according to the packaging bag manufacturing method.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. Preformed buffer sheet, characterized in that: The preformed buffer sheet comprises: Side 1; At least one layer of sheet material, each layer of the sheet material is provided with a slit area having slits, the length of the slit area increases when the slit area is unfolded, and the slit area forms a buffer layer after the slit area is unfolded, and the buffer layer is a three-dimensional grid structure; a third surface, wherein the third surface and the first surface clamp the sheet material and are connected to a lateral edge of the sheet material along the slit direction, the third surface is not connected to another lateral edge of the sheet material along the slit direction, and the length of the third surface perpendicular to the slit direction is greater than the length of the sheet material; Wherein, the first surface is used to shield at least a portion of at least one of the sheet materials to protect the slit area of ​​the sheet material; a plurality of the sheet materials overlap each other, and the overlapping direction makes the slits on two adjacent sheet materials parallel to each other, and the plurality of the sheet materials are connected to each other at two lateral edge positions opposite to each other along the slit direction; One lateral edge of the first surface is connected to one lateral edge of the sheet material along the slit direction, and the other lateral edge of the first surface extends toward the other lateral edge of the sheet material.

2. The preformed buffer sheet according to claim 1, characterized in that: There are two first surfaces, the two first surfaces are connected to the same sheet material and are located on the same side of the surface of the sheet material, and the two first surfaces are respectively connected to two opposite lateral edges of the sheet material.

3. The preformed buffer sheet according to claim 2, characterized in that: At least a portion of the two first surfaces overlap each other to form a first overlapping area.

4. The preformed buffer sheet according to claim 1, characterized in that: The slit area includes a plurality of cutting lines arranged in columns, each cutting line includes a plurality of the slits distributed at intervals, and the slits on two adjacent cutting lines are staggered with each other; the length and interval of the slits on each cutting line are the same, and when the sheet material is unfolded, the slits are twisted into three-dimensional openings to form the buffer layer.

5. The preformed buffer sheet according to claim 4, characterized in that: The sheet material comprises at least two second surfaces, a plurality of the second surfaces are arranged in a direction perpendicular to the slit, two adjacent second surfaces overlap each other to form a second overlapping area, and the area of ​​the second overlapping area is reduced when the second surfaces are unfolded; The plurality of second surfaces of the same sheet-like material are connected to each other at the side edges along the slit direction or at the second overlapping region.

6. The preformed buffer sheet according to claim 4, characterized in that: The second side is made of 40-85g / m 2 Made of paper material.

7. The preformed buffer sheet according to claim 4, characterized in that: The length of the slit is no more than 1.5 cm, and the distance between two adjacent cutting lines is less than 0.4 cm.

8. The preformed buffer sheet according to claim 4, characterized in that: After the slit area is expanded to form a buffer layer, the increased length of the buffer layer is between 0.2 and 1 times the length of the original slit area.

9. The preformed buffer sheet according to claim 1, characterized in that: The third surface is provided with an adhesive at the non-connected side edge of the sheet material along the slit direction to fix the edge of the sheet material after the sheet material is stretched into the buffer layer.

10. A preformed cushioning packaging bag, characterized in that: The invention comprises two preformed buffer sheets according to any one of claims 1 to 9, which are a first liner and a second liner respectively; the sheet material of the first liner and the sheet material of the second liner are located between the third surface of the first liner and the third surface of the second liner; The third surface of the first pad and the third surface of the second pad are connected to each other at two opposite sides perpendicular to the extending direction of the slit to form two vertical sides of the cushioning packaging bag; the third surface of the first pad and the third surface of the second pad are connected to each other at a side edge not connected to the sheet material to form the bottom of the cushioning packaging bag; The sheet material of the first pad and the sheet material of the second pad are connected to each other at one side edge not connected to the third surface; the sheet material and the two third surfaces are not connected at two vertical sides of the cushioning packaging bag.

11. The preformed cushioning packaging bag according to claim 10, characterized in that: The sheet material of the first liner and the sheet material of the second liner are connected to each other at positions close to two vertical sides of the cushioning packaging bag.

12. A preformed cushioning packaging bag, characterized in that: The preformed cushioning packaging bag comprises: an outer bag body, the outer bag body having a bag opening, the outer bag body comprising a bag bottom relative to the bag opening, two side edges for connecting the bag bottom and the bag opening, a front wall and a rear wall located between the two side edges and the bag bottom and the bag opening, the front wall and the rear wall being opposite to each other, and the two side edges being located on both sides of the front wall or the rear wall respectively; The sheet material located inside the outer bag body includes: At least one second layer; One end of the second surface in the length direction is fixed to an inner wall of the bag opening, the other end of the second surface is not connected to the front wall and the rear wall and extends toward the bag bottom, and the other end of the second surface is directly or indirectly connected to the other inner wall of the bag opening; The second surface is provided with a slit area, the length of which increases when it is unfolded; the slit area forms a buffer layer after it is unfolded, and the second surface is located in the outer bag body; When an object is placed in the cushioning packaging bag, the direction in which the object is placed is consistent with the length direction of the sheet material, and the direction in which the object is placed is perpendicular to the width direction of the sheet material. After the object is placed in the cushioning packaging bag, the second surface expands along the placing direction to form a cushioning layer. The cushioning layer causes the second surface to expand in the thickness direction. The cushioning layer is a three-dimensional grid structure. Play a buffering and protective role; The slit area includes a plurality of cutting lines arranged in columns, each cutting line includes a plurality of slits distributed at intervals, and the slits on two adjacent cutting lines are arranged alternately with each other; the slit length and cutting interval on each cutting line are the same, and when the second surface is unfolded, the slits are twisted into the three-dimensional grid structure to form the buffer layer; The length of the slit is not greater than 1.5 cm, the spacing between two adjacent cutting lines is less than 0.3 cm, and after the slit area is expanded to form a buffer layer, the increased length of the buffer layer is between 0.2 and 1 times the length of the original slit area.

13. The preformed cushioning packaging bag according to claim 12, characterized in that: The second mask has two; One end of the first second surface in the length direction is fixed to an inner wall of the bag opening, and the other end of the first second surface is not connected to the front wall or the rear wall and faces the bag bottom; One end portion of the second second surface in the longitudinal direction is fixed to the other inner wall of the bag opening, and the other end portion 22b of the second second surface is connected to the other end portion of the first first surface.

14. The preformed cushioning packaging bag according to claim 13, characterized in that: Also includes a first surface, wherein the second surface has two; One end of the first second surface in the length direction is fixed to an inner wall of the bag opening, the other end of the first second surface is not connected to the front wall or the rear wall and extends toward the bag bottom, and the other end of the first second surface is connected to the first surface; One end of the second second surface in the length direction is fixed to the other inner wall of the bag opening, and the other end of the second second surface is connected to the first surface.

15. The preformed cushioning packaging bag according to claim 14, characterized in that: The first surface is located on a side of the second surface facing away from the outer bag body, and the first surface is used to shield the second surface or a part of the second surface.

16. A method for making a preformed cushioning packaging bag, characterized in that: The method comprises: Step S1: preparing a preformed buffer sheet, the preformed buffer sheet comprising a third surface and a sheet material, the sheet material being provided with a plurality of slits, one side edge of the sheet material along the slit direction being connected to one side edge of the third surface, the other side edge of the sheet material being not connected to the third surface, and both side edges of the sheet material being perpendicular to the slit direction being not connected to the third surface; Step S2: synchronously and continuously feeding the two preformed buffer sheets, the two preformed buffer sheets being the first liner and the second liner respectively, so that the sheet materials of the two preformed buffer sheets are opposite to each other, and the sheet material is located between the third surfaces of the two preformed buffer sheets; Step S3: Apply glue to the positions where the two preformed buffer sheets need to be connected, and press the glue application positions, so that: The third surface of the first pad is connected to the third surface of the second pad at a spacing S position perpendicular to the extending direction of the slit, and two vertical side edges of the prefabricated cushioning packaging bag are formed after cutting at the spacing S position; the third surface of the first pad is connected to the third surface of the second pad at an edge of a side not connected to the sheet material, so as to form the bottom of the cushioning packaging bag; The sheet material of the first pad and the sheet material of the second pad are connected to each other at one side edge not connected to the third surface; the sheet material and the two third surfaces are not connected at two vertical sides of the cushioning packaging bag; Step S4: cutting the interval S perpendicular to the feeding direction to form a plurality of preformed cushioning packaging bags separated along the feeding direction.

17. The method for making a preformed cushioning packaging bag according to claim 16, characterized in that: The method comprises: Step S11: unwinding the third side; Step S12: unwinding at least one layer of the second surface, so that the second surface is located above the third surface, and the width of the third surface perpendicular to the unwinding direction is greater than the width of the second surface perpendicular to the unwinding direction; when unwinding the second surface, the second surface close to the third surface is connected to the third surface at one side along the unwinding direction; the plurality of second surfaces unwound synchronously are stacked up and down on each other, the plurality of second surfaces are connected to each other at the two side edges along the unwinding direction, and the plurality of second surfaces connected to each other form a sheet material; a gap S is provided at the position where the second surface or the sheet material is connected to the third surface; Step S13: unwinding one or two first surfaces, wherein the width of the first surface perpendicular to the unwinding direction is smaller than the width of the second surface; the unrolled first surface is located above the second surface or the sheet material; when unrolling one first surface, one side edge of the first surface along the unwinding direction is connected to the second surface or the sheet material along the unwinding direction; when unrolling two first surfaces, one side edge of one first surface along the unwinding direction is connected to the second surface or the sheet material, and one side edge of the other first surface along the unwinding direction is connected to the second surface or the sheet material; wherein the edge of the first surface not connected to the second surface or the sheet material extends toward the other side edge of the second surface or the sheet material; the positions where the two first surfaces are not connected to the second surface or the sheet material overlap each other to form a first overlapping area; the edges of the first surface perpendicular to the feeding direction are not connected to the third surface; Step S14: when unwinding the third surface, applying glue at intervals S on the third surface perpendicular to the feeding direction; when unwinding the second surface, applying glue on the surface of the second surface that is not connected to the third surface along the feeding direction and is away from the third surface.

18. A preformed cushioning packaging bag production device, characterized in that: Used to make a preformed cushioning packaging bag according to the manufacturing method as claimed in claim 16.

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