Variable volume packaging

Abstract

This application provides a variable volume packaging box, relating to the field of packaging box technology. It includes a side panel and a flap connected to the side panel based on flap seams. The side panel, arranged in a thickness direction of flat paper-corrugated paper-flat paper sequence, comprises n+1 layers of flat paper and n layers of corrugated paper, where n is at least 1. The side panel includes x sides interconnected by flap seams, where x is at least 3. A volume adjustment seam is provided between the top and bottom lines of the side panel, formed by an inward indentation of the outer wall of the side panel. Volume adjustment seams are provided at the same height on each of the x sides of the side panel, with y volume adjustment seams arranged from top to bottom, where y is at least 1. The volume adjustment seams are parallel to the bottom line of the side panel. This application determines the adjusted volume of the box using the volume adjustment seams on the side panel, providing a standardized packaging box for the express packaging industry.

Description

Technical Field

[0001] This application relates to the field of packaging box technology, and more specifically, to a variable volume packaging box. Background Technology

[0002] In the express delivery industry, shipping costs are directly related to the weight and volume of the package. Therefore, the volume of the packaged box directly affects the shipping cost. However, standard packaging boxes often cannot perfectly fit the contents. To prevent the contents from moving within the packaging box during transportation, the usual method is to add filler to block the movement space. This often leads to a waste of shipping space and shipping costs. To solve this problem, existing technologies for changing the volume of the packaging box include: (1) Sliding volume adjustment scheme: Add sliding pairs and fixing structures inside the packaging box. Representative schemes of this type include a shared express box based on the 3R principle (publication number CN211469108U), a reusable express box with adjustable volume and buffer function (publication number CN210761841U), and a reusable express box with adjustable volume (publication number CN108657598A). This type of scheme adds extra mechanical structures to ordinary express boxes, which seriously increases the weight of the packaging and manufacturing cost.

[0003] (2) Splicing volume adjustment scheme: The multi-segment splicing scheme is a Chinese utility model patent for an easy-to-install modular logistics splicing box (publication number CN213443695U). This scheme has many variations, but all of them require additional fixing structures to fix each splicing segment, increasing the space occupied on the outside or inside of the packaging box; The multi-part splicing scheme is a Chinese utility model patent for a combination device of a bedside hanging storage box and a simple bookshelf (publication number CN203735774U). This scheme has actually exceeded the scope of the packaging box, and it also requires additional fixing structures to fix each splicing segment. Its improvement is essentially the same as the multi-segment splicing.

[0004] (3) Folding adjustment scheme: Representative schemes of this type include the Chinese invention patent for a foldable logistics box with variable volume (publication number CN118358859A) and the Chinese utility model patent for an express box (publication number CN217554493U). This type of scheme folds part of the box body inward. When it is under pressure, it has a natural tendency and structure to fold inward. In order to prevent accidental folding during normal use (i.e., use without volume adjustment), the packaging box provided by this scheme must be equipped with a fixed structure, which increases the complexity of the packaging box. Summary of the Invention

[0005] To address the aforementioned issues, this application employs a variable-volume packaging box, comprising a side panel and a flap connected to the side panel via a flap pressure line. The side panel, arranged in a thickness direction of flat paper-corrugated paper-flat paper sequence, includes n+1 layers of flat paper and n layers of corrugated paper, where n is at least 1. The side panel comprises x sides interconnected by the side panel pressure lines, where x is at least 3. A volume adjustment pressure line, formed by an inward indentation of the outer wall of the side panel, is provided between the top and bottom lines of the side panel. Volume adjustment pressure lines are provided at the same height on each of the x sides of the side panel, and y volume adjustment pressure lines are provided from top to bottom, where y is at least 1. The volume adjustment pressure lines are parallel to the bottom line of the side panel.

[0006] Optionally, the total depth of the recess in the volume adjustment pressure line is 20%-100% of the total depth of the recess in the flap pressure line.

[0007] Optionally, the recessed method of the volume adjustment pressure line is formed by the inward recess of one side outer wall of the box side panel, and the corresponding position of the other side outer wall of the box side panel is flush with other positions of the same side outer wall.

[0008] Optionally, a tear line parallel to the side panel pressure line is provided at a position on the side panel adjacent to the lateral distance of the side panel pressure line. The starting height of the tear line is the same as the height of the volume adjustment pressure line, and the ending height of the tear line is the same as the height of the top line of the side panel.

[0009] Optionally, a tear line is provided along the pressure line of the side panel of the box. The starting height of the tear line is the same as the height of the volume adjustment pressure line, and the ending height of the tear line is the same as the height of the top line of the side panel of the box.

[0010] Optionally, a tear line is provided on the outer wall of one side of the enclosure side panel.

[0011] Optionally, the tear line is composed of perforated lines, with the perforations of the tear line penetrating through the side panel of the housing.

[0012] Optionally, a pre-grooved groove is provided along the pressure line of the side panel of the box, starting from the top line of the side panel and going downwards. A sealing sticker is adhered to the outside of the pre-grooved groove. The starting height of the pre-grooved groove is consistent with the height of the volume adjustment pressure line, and the ending height of the pre-grooved groove is consistent with the height of the top line of the side panel of the box. The height of the sealing sticker is greater than or equal to the height of the pre-grooved groove.

[0013] Optionally, a pre-grooved groove is provided along the pressure line of the side panel of the box. The starting height of the pre-grooved groove is consistent with the height of the volume adjustment pressure line, and the ending height of the pre-grooved groove is consistent with the top line height of the side panel of the box. An L-shaped corner fixing plate is provided in conjunction with the pre-grooved groove. Insertion slots are provided at both ends of the L-shaped corner fixing plate, and the insertion slots allow the side panel of the box at the position of the pre-grooved groove to be inserted.

[0014] Optionally, the flap includes a top flap and a bottom flap. The top flap includes an upper flap and a lower flap. A positioning groove is provided between the top line and the bottom line of the upper flap. The positioning groove, the bottom line of the upper flap, and the top line of the upper flap are parallel to each other. The distance between the positioning groove and the top line of the upper flap is the same as the distance between the volume adjustment pressure line and the side plate of the box.

[0015] The beneficial effects of the variable volume packaging box provided in this application are as follows: The variable volume packaging box provided in this application determines the volume of the box after adjustment by setting volume adjustment pressure lines on the side panels of the box. It provides a standardized packaging box for the express packaging industry. When volume adjustment is required, each side panel of the box is separated from top to bottom along the pressure lines to the volume adjustment pressure line position. The separated side panels are then bent inward along the volume adjustment pressure lines to ensure that the adjusted box volume is consistent with the design volume of the volume adjustment pressure lines. When the volume of each side panel is not adjusted, the resulting packaging box still has sufficient support capacity to prevent the box from spontaneously compressing its volume under pressure during normal use. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is a perspective view of the variable volume packaging box provided in the embodiments of this application; Figure 2 yes Figure 1 Enlarged view of point A; Figure 3 This is a front view of the Type A variable volume packaging box provided in the embodiments of this application; Figure 4 yes Figure 3 Enlarged view of point A; Figure 5 This is a schematic diagram of the reverse side of the Type A variable volume packaging box provided in the embodiments of this application; Figure 6 This is a front view of the Type B variable volume packaging box provided in the embodiments of this application; Figure 7 yes Figure 6 Enlarged view of point A; Figure 8 This is a schematic diagram of the reverse side of the Type B variable volume packaging box provided in the embodiments of this application; Figure 9 This is a front view of the C-type variable volume packaging box provided in the embodiments of this application; Figure 10 yes Figure 9 Enlarged view of point A; Figure 11This is a front view of the D-type variable volume packaging box provided in the embodiments of this application; Figure 12 yes Figure 11 Enlarged view of point A; Figure 13 This is a front view of the E-type variable volume packaging box provided in the embodiments of this application; Figure 14 yes Figure 13 Enlarged view of point A; Figure 15 This is a first perspective view of an L-shaped corner fixing plate without a bottom groove provided in an embodiment of this application; Figure 16 This is a second perspective view of the L-shaped corner fixing plate without a bottom groove provided in the embodiments of this application; Figure 17 This is a first perspective view of an L-shaped corner fixing plate with a bottom groove provided in an embodiment of this application; Figure 18 This is a second perspective view of an L-shaped corner fixing plate with a bottom groove provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached drawings: 1-Box side panel; 2-Winged cover; 3-Winged cover seam line; 4-Box side panel seam line; 5-Volume adjustment seam line; 6-Flat paper; 7-Corrugated paper; 8-Box side panel outer wall; 9-Box side panel top line; 10-Box side panel bottom line; 11-Tear line; 12-Perforation; 13-Pre-grooving; 14-Sealing tape; 15-L-shaped corner fixing plate; 16-Insert groove; 17-Bottom groove; 18-Top winged cover; 19-Bottom winged cover; 20-Upper winged cover; 21-Lower winged cover; 22-Upper winged cover top line; 23-Upper winged cover bottom line; 24-Positioning groove; 25-Tongue. Detailed Implementation

[0019] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0020] like Figures 1-5As shown, this application provides a variable volume packaging box, including a box side panel 1 and a flap 2 connected to the box side panel 1 based on the flap pressure line 3. The box side panel 1 includes n+1 layers of flat paper 6 and n layers of corrugated paper 7 in the thickness direction in the order of flat paper 6-corrugated paper 7-flat paper 6, where n is at least 1. The box side panel 1 includes x sides connected to each other by the box side panel pressure line 4, where x is at least 3. A volume adjustment pressure line 5 is provided between the top line 9 and the bottom line 10 of the box side panel, formed by the inward indentation of the outer wall 8 of the box side panel. The x sides of the box side panel 1 are all provided with volume adjustment pressure lines 5 at the same height. The volume adjustment pressure lines 5 are provided from top to bottom with y lines, where y is at least 1. The volume adjustment pressure lines 5 are parallel to the bottom line of the box side panel 1.

[0021] In this embodiment, n is 1, meaning that the side panel 1 of the box provided in this embodiment is composed of two layers of flat paper 6 sandwiching one layer of corrugated paper 7. The term "flat paper" as used in this application refers to the "face paper" when placed on the outside of the carton, the "inner paper" when placed on the inside, and the "middle lining paper" when used between two layers of corrugated paper 7. This application does not aim to improve the material of the corrugated paper 7 or the paper used to hold the corrugated paper 7; therefore, "flat paper" is used to refer to the flat paper material sandwiched on the outside of the corrugated paper 7 or between two layers of corrugated paper 7. In some special cases, the paper material may not present a completely flat shape due to bonding or process issues, but relative to the corrugated paper 7, it does not have a predetermined curved structure. Therefore, the "flat paper" with a non-completely flat shape is still within the scope of protection of this application.

[0022] For a box side panel with two layers of corrugated paper (i.e., n=2), the arrangement is flat paper 6-corrugated paper 7-flat paper 6-corrugated paper 7-flat paper 6. When the three layers of flat paper 6 have different materials and thicknesses, the arrangement is face paper-corrugated paper-middle lining paper-corrugated paper-inner paper. For a box side panel with more layers of corrugated paper 7, the number of middle lining paper and corrugated paper 7 is increased (or the number of flat paper 6 and corrugated paper is increased) according to the same arrangement rule.

[0023] "Outer wall of the side panel of the enclosure" refers to the outer surface of the side panel 1 of the enclosure.

[0024] In this embodiment, x is 4 and y is 2, meaning that the packaging box provided in this embodiment has 4 sides and 2 volume adjustment pressure lines 5.

[0025] During use, the volume of the box after adjustment is determined by the volume adjustment pressure line 5 set on the side panel 1 of the box. This provides a standardized packaging box for the express packaging industry. When volume adjustment is required, each side panel 1 of the box is separated from top to bottom along the pressure line 4 of the side panel to the position of the volume adjustment pressure line 5. The separated side panels 1 are then bent inward along the volume adjustment pressure line 5 to ensure that the adjusted box volume is consistent with the design volume of the volume adjustment pressure line 5. When the volume of each side panel 1 is not adjusted, the packaging box still has sufficient support capacity to prevent the box from spontaneously compressing its volume under pressure during normal use.

[0026] In order to complete the connection of the side panel 1 of the box, the packaging box is usually also equipped with a tongue 25 structure. When the tongue 25 structure exists, the tongue 25 is also equipped with a volume adjustment pressure line 5 that is in the same position as the volume adjustment pressure line 5 of the side panel 1 of the box. The side panel pressure line 4 of the box is also provided between the side panel 1 of the box and the tongue 25.

[0027] In another embodiment of this application, the total depth of the recess of the volume adjustment pressure line 5 is 20%-100% of the total depth of the recess of the flap pressure line 3. Figures 3-5 In the provided Type A variable volume packaging box, the volume adjustment pressure line 5 is set on the outer wall 8 of one side panel of the box body, and its recessed depth is consistent with the single-sided recessed depth of the flap pressure line 3. Therefore, the total recessed depth of the volume adjustment pressure line 5 of this Type A variable volume packaging box is 50% of the total recessed depth of the flap pressure line 3. Figures 6-8 In the provided Type B variable volume packaging box, the volume adjustment pressure line 5 is set on the outer wall 8 of the box side panels on both sides, and its recessed depth is consistent with the single-sided recessed depth of the flap pressure line 3. Therefore, the total recessed depth of the volume adjustment pressure line 5 of the Type B variable volume packaging box is 100% of the total recessed depth of the flap pressure line 3. In order to fully utilize the functions of the volume adjustment pressure line 5 in standardizing the folding box side panel 1 and reducing the difficulty of folding the box side panel 1, the total recessed depth of the volume adjustment pressure line 5 is at least 20% of the total recessed depth of the flap pressure line 3. When the total recessed depth of the volume adjustment pressure line 5 exceeds 100% of the total recessed depth of the flap pressure line 3, it will affect the pressure-bearing capacity of the packaging box under normal use (i.e., when the volume adjustment pressure line 5 is not used to adjust the volume). Therefore, this embodiment requires that the total recessed depth of the volume adjustment pressure line 5 be 20%-100% of the total recessed depth of the flap pressure line 3.

[0028] In another embodiment of this application, the recessed method of the volume adjustment pressure line 5 is formed by the inward recess of one side outer wall of the box side panel 1, and the corresponding position of the other side outer wall of the box side panel 1 is flush with other positions of the side outer wall. In this embodiment, "flush" means that relative to the side of the box side panel 1 where the volume adjustment pressure line 5 is set, the side does not have a volume adjustment pressure line 5 with any recessed depth, and it is not required that the outer wall 8 of the box side panel is a completely flat structure. The situation of recesses or protrusions caused by the production process or the bonding position of the flat paper 6 is still within the protection scope of this application.

[0029] In another embodiment of this application, a tear line 11 parallel to the side panel pressure line 4 is provided at the position of the side panel 1 adjacent to the side panel pressure line 4. The starting height of the tear line 11 is consistent with the height of the volume adjustment pressure line 5, and the ending height of the tear line 11 is consistent with the height of the top line 9 of the side panel.

[0030] When the materials of the flat paper 6 on the outer walls of both sides of the box side panel 1 are exactly the same or similar, and there is no distinction between "inner paper" and "outer paper", the side with the tear line 11 can be selected as the inner or outer side according to actual needs. When the side with the tear line 11 is the outer side, it is convenient for packaging personnel to tear the tear line 11 from the outside of the box. When the side with the tear line 11 is the inner side, it can prevent external dust or water from entering the corrugated paper 7 between the outer walls of both sides of the box.

[0031] When the flat paper 6 on both sides of the outer wall of the box side panel 1 is distinguished as "inner paper" and "outer paper", the outer paper usually has additional functions such as waterproof and wear-resistant compared to the inner paper. The tear line 11 is set on the inner paper side to avoid damaging the waterproof effect of the outer paper and to prevent external dust or water from entering the corrugated paper 7 between the two sides of the box. Since the outer paper with wear-resistant and waterproof functions is more difficult to tear than the inner paper, the tear line 11 is set on the outer paper side to make it easier for packaging personnel to tear the outer paper.

[0032] The actual location of the tear line 11 can be determined according to actual needs.

[0033] like Figures 3-12 As shown, this embodiment provides four tear line 11 design methods: In Figures 3-5 In the provided Type A variable volume packaging box, the tear line 11 is set on the longer two side walls of the box body, and the tear line 11 is set on the outer wall of one side panel 1 of the box body; Figures 6-8 In the provided Type B variable volume packaging box, the tear line 11 is set on the shorter two side walls of the box, and the through hole 12 of the tear line 11 penetrates the side panel 1 of the box; Figures 9-10 In the provided C-type variable volume packaging box, the tear line 11 is set along the side wall of the box; Figures 11-12In the provided Type B variable volume packaging box, the tear line 11 is composed of double rows of perforations 12.

[0034] exist Figures 3-12 In all the design schemes of the provided tear line 11, when the tear line 11 is located adjacent to the pressure line 4 of the side panel of the box, in the horizontal direction, the tear line 11 is located between the rightmost end of the flap 2 corresponding to the left side panel 1 of the box and the leftmost end of the flap 2 corresponding to the right side panel 1 of the box.

[0035] In the embodiments provided in this application, the tear lines 11 are all formed by connecting the perforations 12. However, this application does not exclude other design schemes that can reduce the difficulty of separating the side panels 1 of the box. The design purpose of the tear lines 11 is to provide a standardized means of separating the side panels 1 of the box.

[0036] In another embodiment of this application, such as Figures 13-14 As shown, a pre-grooved groove 13 is provided along the pressure line 4 of the side panel of the box and downward from the top line 9 of the side panel of the box. A sealing sticker 14 is adhered to the outside of the pre-grooved groove 13. The starting height of the pre-grooved groove 13 is the same as the height of the volume adjustment pressure line 5, and the ending height of the pre-grooved groove 13 is the same as the height of the top line 9 of the side panel of the box. The height of the sealing sticker 14 is greater than or equal to the height of the pre-grooved groove 13.

[0037] The sealing sticker 14 is adhered downwards from the top line 9 of the side panel of the box to the outside of the pre-cut groove 13, and is used to seal the side panel 1 of the box when the volume adjustment line 5 is not used to adjust the volume of the box. The design of the pre-cut groove 13 and the sealing sticker 14 together further simplifies the use of the volume adjustment line 5, eliminating the need to separate the side panel 1 of the box along the side panel line 4, and preventing misoperation (such as cutting crookedly or cutting too long) when separating the side panel 1 of the box along the side panel line 4. As a feasible implementation method, the removable residue-free adhesive of Dongguan Kaifeng Plastic Technology Co., Ltd. can be used directly as the sealing sticker 14.

[0038] In another embodiment of this application, a pre-grooved slot 13 is provided along the pressure line 4 of the side panel of the box. The starting height of the pre-grooved slot 13 is consistent with the height of the volume adjustment pressure line 5, and the ending height of the pre-grooved slot 13 is consistent with the height of the top line 9 of the side panel of the box. An L-shaped corner fixing plate 15 is provided in cooperation with the pre-grooved slot 13. Insertion slots 16 are provided at both ends of the L-shaped corner fixing plate 15. The insertion slots 16 allow the side panel 1 of the box at the position of the pre-grooved slot 13 to be inserted.

[0039] This embodiment provides two types of L-shaped corner fixing plates 15. Figures 15-16 What is provided is an L-shaped corner fixing plate 15 without a bottom groove 17. Figures 17-18The provided L-shaped corner fixing plate 15 has a bottom groove 17. The L-shaped corner fixing plate 15 without a bottom groove 17 has insertion slots 16 at both ends for inserting the box side panels 1 on both sides of the pre-cut groove 13. The L-shaped corner fixing plate 15 with a bottom groove 17 allows the box side panels 1 and the box side panel pressure lines 4 below the pre-cut groove 13 to be inserted. The L-shaped corner fixing plate 15 with a bottom groove 17 provides better sealing and fixing effects, but its overall volume is larger to accommodate the bottom groove 17 structure. In actual use, the appropriate option can be selected based on specific needs.

[0040] In another embodiment of this application, the swing cover 2 includes a top swing cover 18 and a bottom swing cover 19. The top swing cover 18 includes an upper swing cover 20 and a lower swing cover 21. A positioning groove 24 is provided between the top line and the bottom line of the upper swing cover 20. The positioning groove 24, the bottom line 23 of the upper swing cover (the bottom edge of the upper swing cover 20), and the top line 22 of the upper swing cover (the top edge of the upper swing cover 20) are parallel to each other. The distance between the positioning groove 24 and the top line 22 of the upper swing cover is the same as the distance between the volume adjustment pressure line 5 and the side plate 1 of the box.

[0041] After adjusting the box volume using the volume adjustment pressure line 5, the two upper flaps 2 at the top will overlap. At this time, observe whether the top line 22 of the upper flap reaches the positioning groove 24 on the lower flap 2. If the top line 22 of the upper flap is far from the positioning groove 24 (in this embodiment, a distance of 0.5cm is considered far), it indicates that the height of the object loaded inside the box exceeds the standard height of the box after adjustment by the volume adjustment pressure line 5. If the top line 22 of the upper flap is close to, coincides with, or covers the positioning groove 24, it indicates that the height of the sealed box is standard. For the box shown in the attached diagram of this embodiment, the positioning groove 24 can be set only on one side of the upper flap 20. The upper flap 20 with the positioning groove 24 is used to overlap the upper flap 20 on the opposite side during sealing. Figure 11 As shown, positioning grooves 24 are provided on both upper covers 20, so the two upper covers 20 can be used in any order of overlap.

[0042] As a feasible implementation, positioning lines can be printed at the same positions as positioning groove 24 to replace positioning groove 24. Positioning groove 24 is used for position identification. Compared with printed positioning lines, the irreplaceable advantage of positioning groove 24 is that it can be based on touch recognition, thus having a wider range of applications, including for blind packaging personnel. As for positioning groove 24 used for touch recognition, its recess depth is determined by the ability to be identified by touch, and its processing method can be stamping or cutting with a cutting tool.

[0043] In this application, "top flap" refers to the flap located at the top of the packaging box when it is in use, and "bottom flap" refers to the flap located at the bottom of the packaging box when it is in use. The distinction between top flap 18 and bottom flap 19 in this application is only used to describe the setting position of positioning groove 24. In actual use, the flap where positioning groove 24 is located is the top flap 18, and the position of bottom flap 19 is the bottom. First, the bottom is sealed, and then the contents are loaded into the packaging box. After loading, the top flap 18 is used for sealing.

[0044] The top cover 18 includes an upper cover 20 and a lower cover 21, which are attached to the top cover 18. Figure 11 In the text, "upper flap" refers to the two flaps 2 located at the top during packaging, and "lower flap" refers to the two flaps 2 located at the bottom during packaging.

[0045] As a feasible implementation method, positioning grooves 24 are provided on both the top flap 18 and the bottom flap 19 of the packaging box. The positioning groove 24 on the bottom flap 19 means that the box is flipped over for use. At this time, the flap provided on the lower side is the bottom flap 19, and the flap provided on the upper side is the top flap 18. This arrangement further increases the applicability of the variable volume packaging box provided in this application and does not limit the front and back positions of the printed text on the box.

[0046] like Figure 11 As shown, for a packaging box with multiple volume adjustment lines 5, the number of positioning slots 24 is increased accordingly. The packaging box has two volume adjustment lines 5 and two positioning slots 24 from top to bottom. When the upper volume adjustment line 5 is used for volume adjustment, the corresponding positioning slot 24 is the upper positioning slot 24. When the lower volume adjustment line 5 is used for volume adjustment, the corresponding positioning slot 24 is the lower positioning slot 24.

[0047] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A variable volume packaging box, comprising a side panel of the box body and a flap connected to the side panel of the box body based on a flap pressure line, characterized in that: The box side panel, arranged in the thickness direction in the order of flat paper-corrugated paper-flat paper, includes n+1 layers of flat paper and n layers of corrugated paper, where n is at least 1. The box side panel includes x sides connected to each other by side panel pressure lines, where x is at least 3. A volume adjustment pressure line is provided between the top line and the bottom line of the box side panel, formed by the inward indentation of the outer wall of the box side panel. Volume adjustment pressure lines are provided at the same height on each of the x sides of the box side panel. There are y volume adjustment pressure lines arranged from top to bottom, where y is at least 1. The volume adjustment pressure lines are parallel to the bottom line of the box side panel.

2. The variable volume packaging box as described in claim 1, characterized in that: The total depth of the recess of the volume adjustment pressure line is 20%-100% of the total depth of the recess of the flap pressure line.

3. The variable volume packaging box as described in claim 1, characterized in that: The recessed method of the volume adjustment pressure line is formed by the inward indentation of one side outer wall of the box side panel, and the corresponding position of the other side outer wall of the box side panel is flush with other positions of the side outer wall.

4. The variable volume packaging box as described in claim 1, characterized in that: A tear line parallel to the side panel pressure line is provided at a position on the side panel adjacent to the lateral distance of the side panel pressure line. The starting height of the tear line is the same as the height of the volume adjustment pressure line, and the ending height of the tear line is the same as the height of the top line of the side panel.

5. The variable volume packaging box as described in claim 1, characterized in that: A tear line is provided along the pressure line of the side panel of the box. The starting height of the tear line is the same as the height of the volume adjustment pressure line, and the ending height of the tear line is the same as the height of the top line of the side panel of the box.

6. The variable volume packaging box as described in claim 4 or 5, characterized in that: The tear line is set on the outer wall of one side of the box body side panel.

7. The variable volume packaging box as described in claim 4 or 5, characterized in that: The tear line is composed of perforated lines, and the perforations of the tear line penetrate the side panel of the box.

8. The variable volume packaging box as described in claim 1, characterized in that: A pre-grooved groove is provided along the pressure line of the side panel of the box body from the top line downwards. A sealing sticker is adhered to the outside of the pre-grooved groove. The starting height of the pre-grooved groove is the same as the height of the volume adjustment pressure line, and the ending height of the pre-grooved groove is the same as the height of the top line of the side panel of the box body. The height of the sealing sticker is greater than or equal to the height of the pre-grooved groove.

9. The variable volume packaging box as described in claim 1, characterized in that: A pre-cut groove is provided along the pressure line of the side panel of the box. The starting height of the pre-cut groove is the same as the height of the volume adjustment pressure line, and the ending height of the pre-cut groove is the same as the height of the top line of the side panel of the box. An L-shaped corner fixing plate is provided in conjunction with the pre-cut groove. The two ends of the L-shaped corner fixing plate are provided with insertion slots, which allow the side panel of the box at the position of the pre-cut groove to be inserted.

10. The variable volume packaging box as described in claim 1, characterized in that: The flap includes a top flap and a bottom flap. The top flap includes an upper flap and a lower flap. A positioning groove is provided between the top line and the bottom line of the upper flap. The positioning groove, the bottom line of the upper flap, and the top line of the upper flap are parallel to each other. The distance between the positioning groove and the top line of the upper flap is the same as the distance between the volume adjustment pressure line and the side plate of the box.

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