Pre-formed buffer sheet, pre-formed buffer packaging bag and manufacturing equipment and method

Abstract

A gasket comprises a first surface, a second surface and a sheet material, a slit is formed between the first surface and the second surface, and a buffer layer is formed after the slit is stretched; only one side edge of the sheet material is connected with the third face and the first face, and the width of the third face is larger than that of the first face and the sheet material. The invention further discloses a buffering packaging bag made of the two buffering sheets, in the manufacturing process, the flaky materials of the two buffering sheets are connected with one ends, not connected with the third faces, of the two buffering sheets, then the side edges, not connected with the flaky materials, of the two third faces are connected with one another, and then the packaging bag is formed after cutting. The buffer sheet is of a plane structure during transportation, and the slits are unfolded into a three-dimensional grid structure only during use, so that the buffer sheet has buffer performance and can be conveniently unfolded, and the transportation cost is saved; and when the packaging bag is manufactured, the third surface does not need to be folded, so that the manufacturing efficiency is improved, and the technical problems in the prior art are solved.

Description

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 field of packaging, the buffer sheet mainly serves the purpose of protecting the packaged items, and the buffer sheet needs to have a buffering function. For example, the existing inflatable bubble structure. The buffer sheet can play a buffering role because the buffer sheet has a buffering effect in the thickness direction, but the thickness of this buffer sheet is relatively large. In this case, the transportation cost is the main reason that seriously restricts the product cost. When the buffer sheet or the packaging bag made of the buffer sheet is transported to other countries and regions, the volume of the buffer sheet increases due to the large thickness of the buffer sheet. The larger volume of the buffer sheet and the packaging bag will pay more transportation costs.

[0003] like Figure 1 and Figure 2 The slit area is formed by cutting on the sheet material. The slits have multiple rows. The slits on the same row are arranged at intervals, and 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 make the cut slits stretch and wrinkle into a three-dimensional mesh structure. The three-dimensional mesh structure can play a buffering and protective role.

[0004] like 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 pulling force when stretched.

[0005] Of course, the above-mentioned slit area can also be used to make packaging bags. Figure 3 At present, the packaging bags made by using the slit area are mainly: a three-dimensional mesh structure after the slit area is stretched is set in the paper outer bag body, and the three-dimensional mesh structure is pasted on the inner wall of the outer bag body, that is, the slit is set in the packaging bag in the three-dimensional mesh structure after stretching. This can ensure the cushioning effect of the packaging bag. However, the thickness of the finished packaging bag is relatively large, and the transportation cost is difficult to reduce; at the same time, the slit area needs to be fixed on the inner wall of the outer bag body with the three-dimensional mesh structure after stretching. During the production, on the one hand, the slit area needs to be stretched, and on the other hand, the three-dimensional mesh structure needs to be fixed in the outer bag body without shrinking to the state before stretching, and the production process is relatively complicated.

[0006] like Figure 4 and Figure 5Therefore, a prefabricated cushioning packaging bag has appeared. The prefabricated cushioning packaging bag refers to a cushioning packaging bag in which the slit area is set in the cushioning packaging bag without being unfolded, and the slit area is suspended in the prefabricated cushioning packaging bag away from the bag mouth. A protective layer with wrinkles is set on the surface of the slit area. The protective layer is located on the innermost side of the cushioning packaging bag. When items are put into the cushioning packaging bag, the objects push the protective layer, and the length of the protective layer changes, thereby driving the slit area to unfold. On the one hand, the protective layer can protect the integrity of the slit area during the stretching and unfolding process, and on the other hand, it can make the force on the slit area more uniform, preventing the situation where part of the slit area cannot be unfolded. The most important thing is that this kind of cushioning packaging bag is in an unstretched state when it is manufactured and transported, so the thickness is thin and the transportation cost is low. When it is transported to the destination for use, it is only stretched when the items are put in, which helps to reduce transportation and storage costs. Figure 5 When the pleats are opened, the slit area becomes a three-dimensional mesh structure, and the bottom contacts the bottom of the outer bag body, forming a cushioning packaging bag with cushioning capacity.

[0007] It should be noted here that Figure 4 In the illustration, 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 the actual product, 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 the slit area is stretched, that is, when the protective layer is pushed toward the bottom of the bag, the folds need to be folded and stretched in a small space such as the contacting inner wall of the cushioning packaging bag. It is difficult to stretch the folds from the previous folded state to a flat surface in a small space, which requires a larger stretching force and can easily tear the folds, resulting in failure or poor stretching in the slit area.

[0009] In addition, if Figure 6 , in the production Figure 4When prefabricating the cushioning packaging bag, first, the outer bag body of the cushioning packaging bag needs to be folded inward along the folding line A01 in the figure, and the cushioning packaging bag becomes the bag bottom after being made; then, the outer bag body is folded outward along another folding line A02 above the folding line A01, and the outer bag body is flattened after folding, so that the two inner surfaces of the outer bag body are exposed, and the width of the outer bag body after folding is correspondingly reduced; then, the inner layer with a slit area and the protective layer with folds on the outer side of the inner layer are pasted on the two free ends of the outer bag body along the folding line A01; after pasting, 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 pasted. After the above production process, a prefabricated cushioning packaging bag is formed. 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 pasted, it needs to be folded again, folded in half, and the two sides are glued. The process is too complicated, especially in the process of continuous feeding production using automated equipment. The folding action will reduce the production efficiency of the product, and the folding line A01 and the folding line A02 need to be pressed in advance before folding to make an indentation. Summary of the invention

[0010] The object of the present invention is to provide a packaging bag, aiming to solve the technical problems in the prior art that the slit area of ​​the prefabricated packaging bag is difficult to unfold and the production efficiency is low. The preformed buffer sheet of the present invention 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.

[0011] The invention also discloses a preformed cushioning packaging bag made from the cushioning sheet material.

[0012] 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; 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.

[0013] The invention also discloses another preformed cushioning packaging bag.

[0014] 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; Wherein, 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 placing direction to form a cushioning layer, and the cushioning layer causes the second surface to expand in the thickness direction. The cushioning layer is a three-dimensional grid structure, which plays a cushioning and protective role. 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.

[0015] The packaging bag disclosed in the present invention is made of buffer sheets, and the packaging bag has a planar structure after being made, which can save costs during transportation. When in use, items can be directly put into the packaging bag, and the gravity of the items or the thrust when the items are put in can cause the sheet material inside to unfold, forming a buffer layer with a three-dimensional mesh structure, and the buffer layer gives the packaging bag a buffer effect. The packaging bag does not need to make the buffer layer inside the packaging bag in the shape of a three-dimensional mesh structure, 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, so the production process is relatively simple. Moreover, the buffer layer can be formed on the bag body by putting items in it, and the use of the packaging bag is relatively simple.

[0016] 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, and 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 at the side of the bottom of the bag. 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.

[0017] In addition, the first surface can also protect the second surface when unfolding, prevent the second surface from breaking, and make the force on the second surface more uniform when unfolding. The present invention also discloses a method for manufacturing a preformed cushioning packaging bag, the method comprising: 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: applying glue to the positions where the two preformed buffer sheets need to be connected, and pressing the glued 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 buffer 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 the edge of the side not connected to the sheet material, so as to form the bottom of the buffer 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.

[0018] 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.

[0019] 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 to transfer 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 side and the third side 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, 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the slit region structure; Figure 2 It is a schematic diagram of the three-dimensional grid structure after the slit area is stretched; Figure 3 It is a schematic diagram of the existing packaging bag structure; Figure 4 It is a schematic diagram of the structure of an existing preformed packaging bag with folds; Figure 5 Figure 4 A schematic diagram of the structure of the existing packaging bag when in use; Figure 6 yes Figure 5 Schematic diagram of the existing packaging bag production process Figure 7 It is a schematic diagram of the structure of the packaging bag of the present invention; Figure 8 is a schematic diagram of the sheet material structure of the second side; Fig. 9 It is a schematic diagram of the sheet material of the second side of the two layers; Fig.10 It is a structural schematic diagram of a packaging bag; Fig.11 It is a structural schematic diagram of a buffer sheet; Fig.12 yes Fig.11 Schematic diagram of the packaging bag structure made of a buffer sheet; Fig.13 yes Fig.11 Schematic diagram of the manufacturing process of the buffer sheet; Fig.14 It is a schematic diagram of a manufacturing process of making packaging bags using buffer sheets; Fig.15 It is another schematic diagram of the packaging bag structure; Fig.16 yes Fig.15 Schematic diagram of the packaging bag production process; Fig.17 It is another schematic diagram of the structure of the buffer sheet; Fig.18 is another schematic diagram of a buffer sheet structure; Fig.19 yes Fig.18 A schematic diagram of splitting the back side of the buffer sheet; Fig. 20 yes Fig.18 Schematic diagram of the buffer sheet manufacturing process; Fig.21 yes Fig.18 A schematic diagram of a process for making packaging bags from cushioning sheets; Fig. 22 yes Fig.21 Schematic cross-sectional view of the produced packaging bag.

[0021] 10, outer bag body; 10a, bag opening; 10b, bag bottom; 10c, two side edges; 10d, front wall; 10e, back wall; 11. First page; 12. Second side; 13. The third side; 20, sheet material; 21, slit area; 210, buffer layer; 211, cutting line; 212, slit; 213, opening; 214, bevel edge; 30. Buffer sheet; 31. First liner; 32. Second liner; DETAILED DESCRIPTION The present invention will be further described and illustrated below in conjunction with specific embodiments and accompanying drawings: like Figure 7 The present invention provides a preformed cushioning packaging bag 100. First, the preformed cushioning packaging bag 100 includes: 1. Outer bag body 10 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.

[0022] 2. Sheet materials 20 Combination Figure 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, 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, to form the buffer layer 210.

[0023] Combined with reference Figures 7 to 9 In some embodiments, the sheet material 20 may have multiple layers, and each layer of the sheet material 20 may have multiple second surfaces 12; The slit 212 in the sheet material 20 is arranged in the outer bag body 10 in an unstretched state, and the sheet material 20 is stretched to form a buffer layer 210 after items are placed therein.

[0024] In the present invention, the preformed cushioning packaging bag 100 is mainly used for express packaging, postal bags and envelope bags. The length and width of the preformed cushioning packaging bag 100 are generally within 80cm*60cm, and a typical size is 10cm*15cm. When making the preformed cushioning packaging bag 100, all paper materials can be selected, that is, the third surface 13 constituting the outer bag body 10a and the second surface 12 constituting the sheet material 20 are both made of paper materials, and stretch paper or kraft paper is particularly preferred; at this time, when the second surface 12 is made of 40-85g / m2 paper material, it can ensure the lightweight of the preformed cushioning packaging bag 100 while ensuring the packaging strength and cushioning performance of the preformed cushioning packaging bag 100. When the second surface 12 is made of paper material less than 40g / m2, after the second surface 12 is stretched into the buffer layer 210, due to the low paper thickness of the second surface 12, the plasticity is reduced, that is, the buffer layer 210 after stretching will change toward the slit state of the plane before stretching, thereby reducing the buffering performance; in addition, after the paper thickness of the second surface 12 is reduced, the ability of the three-dimensional grid structure to withstand pressure is correspondingly reduced, resulting in further reduction of the buffering performance. When the second surface 12 is made of paper greater than 85g / m2, due to the increase in paper thickness, when the second surface 12 of such a thickness is set in the outer bag body 10a, it is difficult to push the slit area 21 to open when putting objects in, or the stretching force required to push the slit area 21 to open and become a three-dimensional grid structure is greater. It is difficult to manually put in objects and stretch the second surface 12 to form a three-dimensional grid structure at the same time. It is necessary to use auxiliary equipment to open the slit area 21 first to form a three-dimensional grid structure before putting in objects, which is inconvenient.

[0025] In the present invention, when the second surface 12 having the slit area 21 is used in express packaging and envelope bags, the length of the slit 212 is preferably no greater than 1.5 cm, and the spacing 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 large, and the cutting density of the slits 212 is high. After the buffer layer 210 is stretched and unfolded into a three-dimensional grid, since the number of twisted openings 213 per unit area is large, and the twisted openings 213 are inclined relative to the plane where the original slits 212 are located, 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 play a stronger supporting role, and the buffering performance is better than that of the slits 212 with a length greater than 1.5 cm and a row spacing greater than 0.4 cm. Moreover, after the slit area 21 of the plane is stretched into the buffer layer 210, since the row spacing is less than 0.4 cm, the thickness of the buffer layer 210 is small, which will not cause an excessive increase in the bag thickness of the preformed buffer packaging bag 100, and can save costs during transportation.

[0026] 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 line spacing of the slit 212 is 0.4cm during cutting, after the slit area 21 is unfolded to form a 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, 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.

[0027] 3. First side 11 (optional) In some embodiments, Fig.10 Optionally, the preformed cushioning packaging bag 100 may further include a first surface 11, which is used to shield at least a portion of at least one of the sheet materials 20 to protect the slit area 21 of the sheet material 20 to prevent damage to the sheet material 20 when an object is placed on one side of the sheet material 20 and stretched. In the present invention, relatively sharp objects do not directly contact the sheet material 20, so the sheet material 20 can be protected while being stretched. In addition, the objects that push the sheet material 20 to move to drive the slit area 21 to unfold 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 objects are put in and push the sheet material 20 to unfold, there will be no problem that the wrinkles cannot be folded and opened in the narrow space inside the outer bag body 10, thereby making it more convenient to open the buffer layer 210 into a three-dimensional mesh structure.

[0028] 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 the tensile force perpendicular to the slit direction pushes the slit area 21 to move toward the bag bottom 10b of the outer bag body 10, the first surface 11 can serve as a guide, so that an article or a structure such as a push rod that pushes the slit 212 to open can move along the first surface 11 to the bottom of the sheet material 20 without generating wrinkles that need to be folded, which is also conducive to the slit area 21 opening to form a cushioning layer 210.

[0029] The following is a detailed description of different implementation methods.

[0030] Implementation method 1: See also Fig.10 , Fig.11The present invention first discloses a preformed cushioning packaging bag 100. First, the preformed cushioning packaging bag 100 includes a cushioning sheet 30, and the cushioning packaging bag 100 is formed by the cushioning sheet 30. The cushioning sheet 30 is composed of an outer bag body 10 made of a third surface 13 and a sheet material 20 located inside 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; Among them, one end 12a of the second surface 12 in the length 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.

[0031] like Fig.12 , 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; When an object is placed in the preformed cushioning packaging bag 100, the direction of placing the object is consistent with the length direction x of the sheet material 20, and the direction of placing the object is perpendicular to the width direction y of the sheet material 20, where the width direction y is also the extension direction of the slit 212. After placing the object, the second surface 12 expands along the placing direction to form a cushioning layer 210, and the cushioning layer 210 causes the second surface 12 to expand in the thickness direction. The cushioning layer 210 is a three-dimensional grid structure, which plays a cushioning and protective role.

[0032] The direct connection means that the other end 12b of the second surface 12 extends toward the bag bottom 10b, turns over and extends toward the bag opening 10a, and is connected to the other inner wall of the bag opening 10a near the bag opening 10a. At this time, when the second surface 12 is fixed, when an object is put into the preformed cushioning packaging bag 100 through the bag opening 10a, the object first acts on the second surface 12 with the slit area 21, and the object pushes the slit area 21 to move toward the bag bottom 10b perpendicularly to the direction of the slit 212, and at this time the slit 212 is twisted into a three-dimensional opening, thereby forming a cushioning layer 210.

[0033] In this embodiment, one end 12b of the second surface 12 may also be indirectly connected to another inner wall of the bag opening 10a.

[0034] For example: A. The second face has two, such as Fig.12One end 12a of the first second surface 12 in the length 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; 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.

[0035] 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.

[0036] 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 in the two second surfaces 12 , the two second surfaces 12 can also be unfolded into a buffer layer 210 with a three-dimensional grid structure.

[0037] Among them, when manufacturing the preformed cushioning packaging bag 100, the structure in which only one sheet material 20 is connected to one third surface 13 can be considered as the preformed cushioning sheet 30. Compared with only one second surface 12, and both ends of the second surface 12 are connected to the two inner walls of the bag opening 10a, the difference is that when the preformed cushioning sheet 30 is used to manufacture the preformed cushioning packaging bag 100, it is no longer necessary to fold the outer bag body 10, that is, it is no longer necessary to fold the third surface 13 on the production line.

[0038] like Fig.13Specifically, the third surface 13 can be unrolled 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 unrolled 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 unrolling 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 unrolled 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. touch; let the second surface 12 and the third surface 13 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, and the pieces of the second surface 12 are continuously fed to the third surface 13, and the distance of the interval S is pasted on the third surface 13, and the 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 of the interval S is the position S of the third surface 13 where glue is applied at intervals; then or while the second surface 12 is unrolled synchronously, glue is applied on the other side edge 12b of the second surface 12 that is not connected to the third surface 13 along the feeding direction. So far, a preformed buffer sheet 30 is first produced.

[0039] In addition to being able to make preformed cushioning packaging bags 100, such preformed cushioning sheets 30 can also be used alone. When used alone, the side edge 12b of the second surface 12 that is not connected to the third surface 13 is pulled toward a position away from the connected end 12a, so that the second surface 12 can be unfolded into a cushioning layer 210 with a three-dimensional grid structure, and then the end 12b of the second surface 12 that is not connected to the third surface 13 that has been glued is pasted on the side edge 13b of the third surface 13, thus forming a preformed cushioning sheet 30 with cushioning performance. When such a preformed cushioning sheet 30 is transported, the second surface 12 is in a flat, unstretched state, and can be rolled or stacked; when used, it can be stretched and transformed into a preformed cushioning sheet with a cushioning layer 210, wrapped on the surface of an item, or filled in a packaging box.

[0040] like Fig.14 , when the preformed cushioning packaging bag 100 is made by using the preformed cushioning sheet 30: 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).

[0041] The positions where the two preformed cushioning sheets (31, 32) are to be connected are pressed together, 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 two vertical side edges 10c of the preformed cushioning packaging bag 100 are formed after cutting at the spacing S position; 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, so as to form a bag bottom 10b of the preformed cushioning packaging bag 100; 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 to form 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.

[0042] Then, the preformed cushioning packaging bags 100 are cut perpendicularly to the feeding direction at the intervals S to form preformed cushioning packaging bags 100 separated along the feeding direction.

[0043] 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 the 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 to transfer 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 then 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 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 the alignment of all the intervals S at the front end and the rear end, which is convenient for pressing, fixing, and cutting.

[0044] In this embodiment, one end 22b of the second surface 12 may also be indirectly connected to another inner wall of the bag opening 10a.

[0045] For example, Fig.15 : B. The preformed cushioning packaging bag 100 further includes a first surface 11, and the second surface 12 also has two.

[0046] One end 12a of the first second surface 12 in the length 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 length 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.

[0047] In this manner, the two second surfaces 12 are connected together at one side edge close to the bag bottom through the first surface, thereby achieving indirect connection.

[0048] 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 part of the second surface 12 .

[0049] Of course, in this method, the two second surfaces 12 are still equivalent to the structure of only one second surface 12 after being spliced ​​by being connected to the first surface 11. After the object is placed, the two second surfaces 12 can also be unfolded into a three-dimensional grid structure buffer layer 210. However, compared with only one second surface 12, and the difference between the two ends (12a, 12b) of the second surface 12 connected to the two inner walls of the bag opening 10a is that when the preformed buffer sheet 30 is used to manufacture the preformed buffer packaging bag 100, it is also no longer necessary to fold the outer bag body 10, that is, it is no longer necessary to fold the third surface 13 on the production line.

[0050] like Fig.16, which is basically the same as the above-mentioned production method A, except that, when two preformed buffer sheets 30, namely the first liner 31 and the second liner 32 are stacked up and down and fed synchronously, it is necessary to feed a layer of the 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. More specifically, the sheet material 20 of the first pad 31 is fed on the conveyor line with the first pad 31 facing upward, and at this time, the sheet material 20 is arranged at intervals S on the third surface 13 of the first pad 31; and then the first surface 11 folded along the feeding direction is synchronously fed above the first pad 31, and 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 that are 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 synchronously with the first liner 31 from above, 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, and then the interval S, the one side edge 13b of the two opposite third surfaces 13 not connected to the sheet material 20, the first surface 11 and the sheet material 20 of 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.

[0051] 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 one fold, the first surface 11 can be fixed to two preformed buffer sheets 30 respectively while making the preformed buffer sheets 30. The production is convenient and simple, which is conducive to improving the production efficiency.

[0052] Implementation Method 2 like Fig.17 In this embodiment, the preformed cushioning packaging bag 100 also includes two preformed cushioning sheets 30, and the preformed cushioning sheets 30 include: First side 11; 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 length of the slit area 21 increases when it is unfolded, and the slit area 21 forms a buffer layer 210 after being unfolded, and the buffer layer 210 is a three-dimensional grid structure; 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, 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; one 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.

[0053] The first surface 11 is used to shield at least a portion of at least one of the sheet materials 20 to protect the slit area 21 of the sheet material 20 . In this embodiment, the sheet material 20 optionally has 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, each layer is provided with a slit area 21 facing the same direction, and when the multi-layer sheet material 20 is stretched and unfolded, 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 distorted three-dimensional openings 213 in the multi-layer buffer layer 210 bite 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 beneficial to improving the buffering performance.

[0054] In this embodiment, the sheet material 20 includes at least one second surface 12, and the slit area 21 is arranged on the second surface 12. When the sheet material 20 has only multiple layers of second surfaces 12, the third surface 13 is arranged on one of the outermost surfaces of the multi-layer sheet material 20, and the first surface 11 is arranged on another surface of the multi-layer sheet material 20, and the multi-layer sheet material 20 is also sandwiched by the first surface 11 and the third surface 13.

[0055] In this embodiment, the third surface 13 and the non-connected side edges 13 b of the sheet material 20 along the slit direction are provided with adhesive to fix the edge 20 b of the sheet material 20 after the sheet material 20 is stretched into the buffer layer 210 .

[0056] In addition to being used to make preformed cushioning packaging bags 100, such preformed cushioning sheets 30 can also be used alone. When used alone, the side edge 20b of one or more layers of sheet material 20 that is not connected to the third surface 12 is pulled toward a position away from the connected end 20a, so that the second surface 12 can be unfolded into a cushioning layer 210 with a three-dimensional grid structure, and then the end 20b of the sheet material 20 that has been glued and is not connected to the third surface 13 is pasted on the side edge 13b of the third surface 13, thus forming a preformed cushioning sheet 30 with cushioning performance. When such a preformed cushioning sheet 30 is transported, the one or more layers of sheet material 20 are in a flat, unstretched state and can be rolled or stacked; when used, after being stretched, it is transformed into a preformed cushioning sheet 30, wrapped on the surface of an object, or filled in a packaging box.

[0057] like Fig.18 , wherein, in a preferred embodiment, the first surfaces 11 have two, the two first surfaces 11 are connected to the same sheet material 20, and are located on the same side of the surface of the sheet material 20, which is also the other side away from the third surface 13. The two first surfaces 11 are respectively connected to two opposite lateral edges 11a of the sheet material 20. That is, one of the first surfaces 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, and the unconnected side edge 11b of any first surface 11 extends toward the other first surface 11, and during the extension process, at least a portion of the two first surfaces 11 overlap, forming a first overlapping area 110. The two first surfaces 11 in the 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.

[0058] 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 is correspondingly reduced. The reduced width position of the second surface 12 is not covered by the buffer layer 210, which will lead to poor buffering effect.

[0059] like Fig.19In this embodiment, at least one layer of the multilayer sheet material 20 includes at least two second surfaces 12, and the plurality of second surfaces 12 are arranged on the third surface 13 in a direction perpendicular to the slit, and two adjacent second surfaces 12 overlap with each other to form a second overlapping area 120. The plurality of 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, and the area of ​​the second overlapping area 120 is reduced when the second surface 12 is unfolded.

[0060] The same sheet material 20 is formed by connecting more than two second surfaces 12, and the connection position is at the two side edges (12a, 12b) along the slit direction, which coincides with the connection position of the first surface 11; when the sheet material 20 is stretched and unfolded into the buffer layer 210, the two second surfaces 12 can also be unfolded synchronously without affecting each other. Moreover, the reduced width position of the buffer layer 210 after the second surface 12 on the same sheet material 20 is unfolded is covered by another sheet material 20, which can reduce the area of ​​the sheet material 20 that is exposed and not covered by the buffer layer 210, and improve the buffer protection range of the entire sheet material 20.

[0061] Of course, when the preformed cushioning sheet 30 is used to make the preformed cushioning packaging bag 100: like Fig. 20 , making a preformed buffer sheet 30; like Fig.21 Combined with Figure 7 , synchronously and continuously feeding the two preformed buffer sheets 30, 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); Gluing the positions where the two preformed cushioning sheets (31, 32) are to be connected, and pressing the glued positions, 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, 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, so as to form a bag bottom 10b of the cushioning preformed cushioning packaging bag 100; 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; The interval S is cut perpendicularly to the feeding direction to form a plurality of preformed cushioning packaging bags 100 separated along the feeding direction. Fig. 22 .

[0062] This embodiment is different from the first embodiment in making the preformed buffer sheet 30, specifically: like Fig. 20 The method for making the preformed buffer sheet 30 includes: Unwinding the third side 13; 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 up and down on each other, the plurality of second surfaces 12 are connected to each other at the two 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; 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.

[0063] When unwinding the two first surfaces 11, a side edge 11a of one 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, and a side edge 11b of the other first surface 11 along the feeding direction is connected to another side edge (12b, 20b) of the second surface 12 or the sheet material 20; 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 positions where the two first surfaces 11 are not connected to the second surface 12 or the sheet material 20 overlap each other 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; 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.

[0064] 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 the 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 to transfer 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, 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 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.

[0065] In addition, in the present embodiment, when each sheet material 20 has two second surfaces 12, and the two second surfaces 12 are stacked to have a second overlapping area 120, when such a preformed buffer sheet 30 is manufactured, 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 a side edge along the slit direction as the third surface 13 is conveyed; 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 conveyed 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 conveyed synchronously with the third surface 13 again, and the second surface 12 cut for the second time is sequentially pasted on the third surface 12 at one side edge along the slit direction; until the second surface 12 is conveyed to the next interval S, the second surface 12 is cut for the third time; at this point, two pieces of the second surface 12 are sequentially pasted on 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.

[0066] When manufacturing the preformed cushioning packaging bag 100 of the present application, the 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 conveyor line, which is beneficial to improving the feeding rate of the conveyor line, and there is no need to fold the third surface 13 forming the outer bag body 10 multiple times, which is also beneficial to improving the manufacturing efficiency.

[0067] 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.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution 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 solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution 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; Wherein, 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, and the cushioning layer causes the second surface to expand in the thickness direction. The cushioning layer is a three-dimensional grid structure, which plays a cushioning 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: applying glue to the positions where the two preformed buffer sheets need to be connected, and pressing the glued 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 buffer 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 the edge of the side not connected to the sheet material, so as to form the bottom of the buffer 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, wherein: 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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