M-bottom waist-line-free paper container capable of preventing tongue from being folded and hollow in bottom

Abstract

The utility model relates to the field of paper containers, and discloses an M-bottom waist-line-free paper container capable of preventing tongue folding and hollow bottom, which comprises a body, and the body comprises a bottom, a front piece, a left side piece and a right side piece; one side piece of the left side and one side piece of the right side are inner lapping side pieces outwards connected with lapping pieces, the other side piece of the left side and the right side are outer lapping side pieces, and the bottoms of the left side and the right side extend to form tongue folding pieces respectively; the outer lapping side piece comprises a vertical bonding part used for being in contact with the lapping piece of the inner lapping side piece, a transverse bonding part used for being in contact with the outer side face of the folding tongue piece and a transition bonding part, the transition bonding part comprises an outer bonding part and an inner bonding part, and the lapping piece is provided with a notch in the height range corresponding to the folding tongue piece. According to the utility model, the inner bonding part is in contact with the tongue folding piece in the area in the width range of the lapping piece, so that the tongue folding piece is also bonded by the outer surface in the middle of the notch, and the problem that the middle part of the tongue folding piece is lack of glue and the side surface is hollow is solved.

Description

Technical Field

[0001] The utility model relates to the field of paper containers, in particular to an M-bottom waistline-free paper container which can prevent the bottom of the folded tongue from being hollow. Background Art

[0002] In particular, paper containers have been increasingly widely used in various fields in recent years due to the biodegradable and recyclable characteristics of paper itself. For example, the Chinese invention patent with publication number CN111114987A, entitled "A double-sided middle-sealed M-bottom; three-dimensional paper bag and its manufacturing process", discloses a paper bag with the sides of the bag body bonded together, eliminating the waistline of the bag body, and setting the overlapped surface on the side of the bag body. The front side is complete in both the use state and the compressed state, greatly improving the aesthetics of the traditional bag body. However, as disclosed in

[0035] of its specification: the front side 1 and the bottom side 3 of a paper bag are both complete surfaces, without any signs of sealing, and the side 2 of the paper bag is composed of a first side edge 21 and a second side edge 22, the first side edge 21 is bonded to the second side edge 22 by an adhesive to form the side 2, and the bonded part of the first side edge 21 and the second side edge 22 is bonded in an overlapping manner. However, due to the overlapping of the sides of this paper bag, the overlapping pieces overlap the outside of the inner side, forming a full coverage of the overlapping pieces of the inner side by the outer side piece. In this way, the part of the folding tongue where the overlapping piece is located will not contact any of the outer side pieces, resulting in a hollow. To solve this problem, it is necessary to apply glue horizontally on the inner side across the crease line. However, when the crease line on the side of the container is folded in half, the glue-coated part will also be compressed and folded in half, resulting in the condition that the crease line part in the middle of the folding tongue becomes hard after the glue dries, so the hardened part of the paper container is easily damaged. Summary of the invention

[0003] The utility model aims at the shortcomings of the prior art and provides an M-bottom waistline-free paper container which prevents the bottom of the folded tongue from being hollow and solves the problem that the folding line part becomes hard due to glue coating.

[0004] To solve the above technical problems, the utility model is solved by the following technical solutions:

[0005] The main body has at least an unfolded state and a formed state; when the main body is in the unfolded state, the main body includes a bottom, and positive sheets are respectively extended on the front and rear sides of the bottom, wherein a left sheet and a right sheet are respectively extended on the left and right sides of each positive sheet; one side sheet on the left and right sides is an inner side sheet connected to an overlap sheet outwardly, and the other side sheet is an outer side sheet, wherein folded tongue sheets are respectively extended to the left and right sides of the bottom.

[0006] The outer side piece includes a vertical bonding portion for contacting the overlapping piece of the inner side piece, a transverse bonding portion and a transition bonding portion for contacting the outer side surface of the folding tongue piece. The transition bonding portion is located at the intersection where the transverse bonding portion extends outward and the vertical bonding portion extends toward the bottom. The transition bonding portion includes an outer bonding portion and an inner bonding portion. The overlapping piece is provided with a notch within the height range corresponding to the folding tongue piece.

[0007] When the main body is in a forming state, the outer bonding portion covers and contacts the outer surface of the overlapping piece of the inner side piece, and the inner bonding portion covers the outer side surface of the folded tongue piece through the notch, so that the transition bonding portion is connected to the overlapping piece and the folded tongue piece at the same time, and the folded tongue piece contacts the inner surface of the outer side piece within the width range of the corresponding overlapping piece.

[0008] Preferably, a side middle fold line is provided between the overlap sheet and the inner side sheet, and the inner side sheet is glued transversely, and the glue does not exceed the straight line where the side middle fold line is located. If the side is fully coated with glue transversely, when the fold line of the container side is folded, the glue-coated part will also be compressed and folded, resulting in the condition that the fold line part in the middle of the fold tongue becomes hard after the glue dries, so that the hardened part of the paper container is easily damaged. The glue does not exceed the straight line where the side middle fold line is located, and the solution of setting a notch can solve the hollow problem and the glue coating problem.

[0009] Preferably, when the main body is in a forming state, the outer bonding portion has two layers of overlapping pieces and folding tongue pieces, and the inner bonding portion has a single layer of folding tongue pieces.

[0010] Preferably, the glue on the transition bonding portion is extended from the glue on the vertical bonding portion to the bottom or extended from the glue on the horizontal bonding portion to the outside.

[0011] Preferably, the overlapping piece has a cutting line that forms a notch in the overlapping piece. When the main body is in a formed state, the overlapping piece is attached to the inner side of the outer side piece, and the cutting line separates the outer side piece into a part covering the overlapping piece and a part corresponding to the notch. When the main body is in a formed state, the part of the outer side piece corresponding to the notch contacts with the folded tongue piece.

[0012] Preferably, a side middle fold line is provided between the overlap sheet and the inner side sheet, the notch is located at the bottom of the overlap sheet, and the notch area does not exceed the side middle fold line. Since the notch is located at the bottom of the overlap sheet, it is easy to process, and at least the bottom middle of the folded tongue sheet near the fold line can be ensured to contact the outer side sheet to prevent it from being hollow.

[0013] Preferably, the vertical adhesive portion has a less-glue giving way section, and a horizontal upper fold line is provided on the top of the main body, and the less-glue giving way section spans the upper fold line.

[0014] Preferably, a clearance notch is provided at the top of the folding tongue piece. The function of the clearance notch is to prevent the middle part of the folding tongue piece from tilting toward the inside of the container when the folding tongue piece is folded along the middle fold line, thereby improving the aesthetics of the bag body.

[0015] Preferably, the clearance gap is located in the middle of the folding tongue piece, and the width of the clearance gap is greater than the width of the overlapping piece.

[0016] The utility model has significant technical effects due to the adoption of the above technical solutions:

[0017] The outer side piece located outside the inner side piece has an inner bonding portion in contact with the folding tongue piece in the area within the width range of the overlapping piece, so that the position corresponding to the notch in the middle of the bottom of the folding tongue piece is also bonded on the outer surface, thereby further solving the problem of the hollow side of the folding tongue piece due to lack of glue in the middle, thereby improving product quality.

[0018] By gluing the inner side panels horizontally and ensuring that the glue does not exceed the straight line where the fold line is located in the middle of the side, the glue is prevented from accumulating and drying when the flexible container is compressed, thus solving the problem that the thickness of the traditional folded part is large and affects the aesthetics or the flexible container is damaged during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of a paper container in an unfolded state;

[0020] Figure 2 This is a schematic diagram of the structure of a paper container after it is folded into a U shape in the first step;

[0021] Figure 3 yes Figure 1 A partial enlarged view of middle C;

[0022] Figure 4 It is a schematic diagram of the structure of the outer side piece;

[0023] Figure 5 yes Figure 4 A partial enlarged view of D in the middle;

[0024] Figure 6 yes Figure 4 A partial enlarged view of the middle transition bonding area.

[0025] The names of the parts indicated by the numerical labels in the above drawings are as follows: among them, 1, bottom; 2, main piece; 3, side piece; 3a, inner side piece; 3b, outer side piece; 31, overlapping piece; 311, notch; 312, cutting line; 32, vertical bonding part; 321, less glue giving way section; 33, horizontal bonding part; 34, transition bonding part; 341, outer bonding part; 342, inner bonding part; 35, side middle fold line; 36, upper mouth crease line; 4, folded tongue piece. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0027] A paper container with an M-bottom and no waistline, which prevents the bottom of the folded tongue from being hollow. Figure 1-2 As shown, it includes a main body, which has at least an unfolded state and a formed state; when the main body is in the unfolded state, the main body includes a bottom 1, and main pieces 2 are respectively extended on the front and rear sides of the bottom 1, wherein each main piece 2 is respectively extended on the left and right sides with a left side piece and a right side piece; one side piece on the left and right sides is an inner side piece 3a connected to an overlap piece 31 outwardly, and the other side piece is an outer side piece 3b, wherein the bottom 1 is respectively extended with folded tongue pieces 4 on the left and right sides.

[0028] When the container is folded and formed, the front and rear sides of the bottom 1 are turned up along the fold line to form a U shape, and the folding tongue pieces 4 on the left and right sides of the bottom 1 are turned up. The left and right sides of the inner side positive piece 2 of the side are formed by contacting different outer side pieces 3b and inner side pieces 3a, respectively. The outer side pieces 3b and the inner side pieces 3a overlap and adhere to each other to achieve cylindrical adhesion around the sides, and the inner surface of the side is in contact with the outer surface of the folding tongue piece 4. The glue on the side of the body is in an inverted T-shaped area for overlapping the side and bonding the side and the folding tongue piece. The bottom has a V-shaped fold line with an end point located at the middle fold line of the bottom. After the container is in the formed state, it can be further compressed and folded to make the two sides of the positive pieces overlap, and the bottom is folded inward to form an M bottom state. The middle fold of the bottom and the side middle fold line 35 of the side of the middle fold of the folding tongue piece are all located in the same plane. After forming, the folds are all at the bottom, the positive piece has no fold waistline, and the side has only the middle fold line, and there is no other fold waistline. The bag mouth is folded inward all around, and the inner fold of the positive piece has a hand-carrying rope hole. The two ends of the hand rope are respectively fixed to the inner side of the positive film through the rope threading holes from the outside of the bag opening extension part.

[0029] like Figure 4 , Figure 6 As shown, the outer side piece 3b includes a vertical bonding portion 32 for contacting the overlapping piece 31 of the inner side piece 3a, a transverse bonding portion 33 for contacting the outer side surface of the folding tongue piece 4, and a transition bonding portion 34, the transition bonding portion 34 is located at the intersection where the transverse bonding portion 33 extends outward and the vertical bonding portion 32 extends toward the bottom, and the transition bonding portion 34 includes an outer bonding portion 341 and an inner bonding portion 342;

[0030] The overlapping piece 31 is provided with a notch 311 within the height range corresponding to the folding tongue piece 4; the shape of the notch 311 can be an arc cutting line, or a punching hole of various shapes, or a triangle or trapezoid as shown in the figure.

[0031] When the main body is in a forming state, the outer adhesive portion 341 covers and contacts the outer surface of the overlapping piece 31 of the inner side piece 3a, and the inner adhesive portion 342 covers the outer side surface of the folding tongue piece 4 through the notch 311, so that the transition adhesive portion 34 is connected to the overlapping piece 31 and the folding tongue piece 4 at the same time, and the folding tongue piece 4 is in contact with the inner surface of the outer side piece 3b within the width range of the corresponding overlapping piece 31.

[0032] When the body is in the forming state, the outer bonding part 341 and the vertical bonding part 32 are in contact with the lap piece 31 of the inner side piece 3a, respectively, and the inner bonding part 342 and the transverse bonding part 33 are in contact with the outer side surface of the folding tongue piece 4, respectively. The folding tongue piece 4 is in contact with the outer side piece 3b through the inner bonding part 342 within the width of the corresponding lap piece 31. Among them, the glue of the transition bonding part 34 is usually formed by extending the vertical bonding part 32 to the bottom or the transverse bonding part 33 to the outside, which is convenient for reducing the steps of gluing. In the figure, the glue of the transition bonding part 34 is extended to the bottom. For this embodiment, the area of ​​the transition bonding part 34 is the area formed by the outer side piece 3b where the highest point of the horizontal bonding part 33 extends outward, and the area of ​​the vertical bonding part 32 is the area above this area; if the transition bonding part 34 is formed by the horizontal bonding part 33 extending and gluing, the area of ​​the transition bonding part 34 is the area formed by the lowest point of the vertical bonding part 32 extending downward, and the area of ​​the horizontal bonding part 33 is the area inside this area; if the transition bonding part 34 is formed by the horizontal bonding part 33 and the vertical bonding part 32 extending and gluing together, then the width of the transition bonding part 34 corresponds to the width of the vertical bonding part 32, and the height of the transition bonding part 34 corresponds to the area formed by the horizontal bonding part 33. The bonding part mentioned in the utility model is in contact with another part, and in the final container forming state after gluing, it is actually in a state of adhesion.

[0033] like Figure 3 As shown, a side middle fold line 35 is provided between the overlap sheet 31 and the inner side sheet 3a, and the inner side sheet 3a is glued transversely, and the glue does not exceed the straight line where the side middle fold line 35 is located. When the inner side sheet 3a is glued transversely, the transverse bonding portion 33 does not exceed the straight line where the side middle fold line 35 is located. This prevents the flexible container from accumulating glue and drying to harden when compressed, and solves the problem that the traditional fold part is too thick and the aesthetics are affected or the flexible container is damaged during use.

[0034] When the main body is in the forming state, the outer bonding part 341 has two layers of the overlapping piece 31 and the folding tongue piece 4, and the inner bonding part 342 has a single layer of the folding tongue piece 4.

[0035] The glue on the transition bonding portion 34 extends from the glue on the vertical bonding portion 32 to the bottom or extends from the glue on the horizontal bonding portion 33 to the outside.

[0036] The overlapping piece 31 has a cutting line 312 that forms a notch 311 in the overlapping piece 31. When the main body is in a formed state, the overlapping piece 31 is attached to the inner side of the outer side piece 3b. The cutting line 312 separates the outer side piece 3b into a portion that covers the overlapping piece 31 and a portion that corresponds to the notch 311. When the main body is in a formed state, the portion of the outer side piece 3b that corresponds to the notch 311 contacts the folding tongue piece 4. The portion where the overlapping piece 31 is located does not have glue between it and the folding tongue piece 4, so there will be a problem that the portion is hollow, and the folding tongue piece 4 may warp inward. After the notch 311 is set, the outer side piece 3b located outside the inner side piece 3a contacts the folding tongue piece 4 at the overlapping piece 31 portion corresponding to the notch 311, so that the middle of the notch 311 also has an outer surface bonded, thereby further solving the problem of the hollow side and improving product quality.

[0037] A side middle fold line 35 is provided between the overlapping piece 31 and the inner side piece 3 a , and the notch 311 is located at the bottom of the overlapping piece 31 , and the area of ​​the notch 311 does not exceed the side middle fold line 35 .

[0038] like Figure 5 As shown, the vertical bonding portion 32 has a less glue yielding section 321, and a horizontal upper folding line 36 is provided on the top of the body, and the less glue yielding section 321 crosses the upper folding line 36. When the outer side piece 3b is vertically glued, if the glue spraying method is adopted, the gluing can be stopped when it is a certain distance away from the upper folding line 36, and the gluing can be continued after the glue head passes the upper folding line 36, and the glue does not pass or the glue is drawn to form a less glue yielding section 321 at the upper folding line 36. If the method of scraping glue or adding a contact component is adopted, the gluing can be stopped at the less glue yielding section 321 to basically form a small section without glue. Since the less glue yielding section 321 has the function of almost no glue at the upper folding line 36, it is prevented that the part of the inner folding piece 6 will be hardened after the glue is accumulated and dried after being folded inward.

[0039] A clearance notch 41 is provided at the top of the folding tongue piece 4. When the bag body is folded, it is folded into an M shape along the fold line 35 of the side edge for easy storage. The top of the folding tongue piece 4 is easily lifted up due to the lack of glue. The presence of the clearance notch 41 can prevent the middle of the folding tongue piece 4 from being lifted up. Furthermore, the clearance notch 41 is located in the middle of the folding tongue piece 4, and the width of the clearance notch 41 is greater than the width of the overlapping piece 31.

[0040] In the description of the present utility model, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A paper container with an M-bottom and no waistline that prevents the bottom of the folded tongue from being hollow, comprising: The body has at least an expanded state and a formed state; When the main body is in an unfolded state, the main body comprises a bottom (1), and front and rear sides of the bottom (1) are respectively extended with main sheets (2), wherein left and right sides of each main sheet (2) are respectively extended with left and right sheets; one side sheet of each left and right side is an inner side sheet (3a) connected outwardly with a lap sheet (31), and the other side sheet is an outer side sheet (3b), wherein the bottom (1) is respectively extended with folded tongue sheets (4) on the left and right sides; the characteristics are: The outer side piece (3b) comprises a vertical bonding portion (32) for contacting the overlapping piece (31) of the inner side piece (3a), a transverse bonding portion (33) for contacting the outer side surface of the folding tongue piece (4), and a transition bonding portion (34); the transition bonding portion (34) is located at the intersection where the transverse bonding portion (33) extends outward and the vertical bonding portion (32) extends toward the bottom; the transition bonding portion (34) comprises an outer bonding portion (341) and an inner bonding portion (342); The overlapping piece (31) is provided with a notch (311) within a height range corresponding to that of the folding tongue piece (4); When the main body is in a formed state, the outer bonding portion (341) covers and contacts the outer surface of the overlapping piece (31) of the inner side piece (3a), and the inner bonding portion (342) covers the outer side surface of the folded tongue piece (4) through the notch (311), so that the transition bonding portion (34) is connected to the overlapping piece (31) and the folded tongue piece (4) at the same time, and the folded tongue piece (4) is in contact with the inner surface of the outer side piece (3b) within the width range of the corresponding overlapping piece (31).

2. The M-bottomed paper container without waistline and having a hollow bottom to prevent the tongue from being folded according to claim 1, characterized in that: A side center fold line (35) is provided between the overlapping piece (31) and the inner side piece (3a), and the inner side piece (3a) is glued transversely, and the glue does not exceed the straight line where the side center fold line (35) is located.

3. The M-bottomed paper container without waistline and having a hollow bottom to prevent the tongue from being folded according to claim 1, characterized in that: When the main body is in a formed state, the outer bonding portion (341) has two layers of overlapping pieces (31) and folded tongue pieces (4), and the inner bonding portion (342) has a single layer of folded tongue pieces (4).

4. The M-bottomed paper container without waistline and preventing the bottom of the tongue from being hollow according to claim 1, characterized in that: The glue on the transition bonding portion (34) is extended from the glue on the vertical bonding portion (32) to the bottom or extended from the glue on the horizontal bonding portion (33) to the outside.

5. The M-bottomed paper container without waistline and having a hollow bottom to prevent the tongue from being folded as claimed in claim 1, characterized in that: The overlapping piece (31) has a cutting line (312) for forming a notch (311) in the overlapping piece (31); when the main body is in a formed state, the overlapping piece (31) is attached to the inner side of the outer side piece (3b); the cutting line (312) separates the outer side piece (3b) into a portion covering the overlapping piece (31) and a portion corresponding to the notch (311); the portion of the outer side piece (3b) corresponding to the notch (311) contacts the folded tongue piece (4).

6. The M-bottomed paper container without waistline and having a hollow bottom to prevent the tongue from being folded as claimed in claim 5, characterized in that: The notch (311) is located at the bottom of the overlapping piece (31), and the area of ​​the notch (311) does not exceed the side middle fold line (35).

7. A paper container with an M-bottom and no waistline and preventing the bottom from being hollow due to the tongue being folded according to any one of claims 1 to 6, characterized in that: The vertical bonding portion (32) has a less-glue giving way section (321), and a horizontal upper folding line (36) is arranged on the top of the main body, and the less-glue giving way section (321) spans the upper folding line (36).

8. The M-bottomed paper container without waistline and preventing the bottom from being hollow due to the tongue folding according to any one of claims 1 to 6, characterized in that: A clearance notch (41) is provided at the top of the folding tongue piece (4).

9. The M-bottomed paper container without waistline and having a hollow bottom to prevent the tongue from being folded as claimed in claim 8, characterized in that: The clearance notch (41) is located in the middle of the folding tongue piece (4), and the width of the clearance notch (41) is greater than the width of the overlapping piece (31).

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