Double-sided middle-sealed top-lapped paper bag and its manufacturing process

Abstract

The present invention belongs to the technical field of packaging bags, and particularly refers to a novel double-sided center-sealed paper bag with a top overlap and a manufacturing process, comprising a bottom surface, with front surfaces provided on both the front and rear sides of the bottom surface, the two front surfaces being connected by two side surfaces, the side surfaces comprising a first sub-side surface and a second sub-side surface connected by glue, the side edge of the first sub-side surface being provided with an extension section, the upper end of the second sub-side surface being provided with a top overlap, the extension section being glued to the inner wall of the second sub-side surface, and then the top overlap is folded downward and glued to the extension end; the present invention has the advantages of simple structure, more beautiful appearance, increased crack resistance of the connection seam, and thus extended service life of the paper bag.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging bags, and in particular relates to a novel double-sided middle-sealed top-overlapping paper bag and a manufacturing process thereof. Background Art

[0002] Paper packaging bags are commonly used to package luxury goods, such as mobile phones, headphones, jewelry, shoes and clothing, etc. Since paper bags are mostly used for high-end items, higher requirements are placed on the appearance and quality of paper bags.

[0003] For example, Chinese invention patent ZL2020100284808 discloses a double-sided, center-sealed, M-bottom three-dimensional paper bag, comprising a bag body, which is composed of a front surface, a bottom surface and a side surface, a bag opening is formed on the top of the bag body, the side surface comprises a first side edge and a second side edge, the first side edge is connected to the second side edge by an adhesive, and also comprises a bottom edging, the bottom edging adheres the side edge to the bottom surface by an adhesive, the bottom edging is located on the outside of the bottom surface, and is connected to the first side edge and the inner wall of the second side edge by an adhesive.

[0004] like Figure 1 As shown: in the above-mentioned paper bag, the side surface formed by the connection of the first side edge 101 and the second side edge 102 has the connection seam 103 of the first side edge 101 and the second side edge 102 exposed at the top of the side surface, which affects the appearance. In addition, the connection between the first side edge 101 and the second side edge 102 at the top has no other protective force except the adhesive force of the glue. After long-term storage and use, the glue is easy to come apart, making the connection seam 103 at the top of the first side edge and the second side edge easy to crack. Summary of the invention

[0005] In view of the above problems, the present invention provides a paper bag with double-sided center seal and top overlap wrapped and a manufacturing process. The top connecting seam of the paper bag is wrapped, so that the top of the side has better crack resistance, and the connecting seam is covered, making the appearance of the paper bag more beautiful.

[0006] The object of the present invention is achieved in that:

[0007] A double-sided, center-sealed, top-lapped paper bag comprises a bottom surface, front surfaces are arranged on both the front and rear sides of the bottom surface, the two front surfaces are connected by two side surfaces, the side surfaces comprise a first sub-side surface and a second sub-side surface that are adhesively connected, the side edge of the first sub-side surface is provided with an extension section, the upper end of the second sub-side surface is provided with a top lapped edge, the extension section is adhesively bonded to the inner wall of the second sub-side surface, and then the top lapped edge is folded downward and adhesively bonded to the extension end.

[0008] The upper end of the front side is provided with a pocket folding edge, and the pocket folding edge is connected with the top overlap edge as a whole.

[0009] The top overlap is a corner of the folded edge of the bag opening.

[0010] A "V"-shaped fold is formed between the top overlap and the bag opening fold.

[0011] A pocket hole is formed on the bag opening fold, and the fixed section of the hand strap passes through the pocket hole and is glued between the front face and the bag opening fold.

[0012] A handle patch is also glued between the front side and the folded edge of the bag opening. The handle patch is glued on the front side, and the fixed section of the handle strip is glued between the handle patch and the folded edge of the bag opening.

[0013] Bottom edging is also provided on both sides of the bottom surface, and the bottom edging is glued to the inner wall of the side surface to adhere the side surface to the bottom surface.

[0014] An oblique opening is formed on one end of the first sub-side surface and the second sub-side surface close to the bottom surface, and the two oblique openings form a "V"-shaped groove at the bottom of the side surface.

[0015] A process for manufacturing a double-sided middle-sealed paper bag with a top-lapped wrapping surface comprises the following steps:

[0016] 1) Cut out paper of corresponding specifications (and process the indentation between the bottom and the side, the indentation between the front and the side, the indentation of the two pocket folds, the crease of the bottom, and the crease between the bottom and the bottom edge);

[0017] 2) Stick the handle patch on the front near the fold of the bag;

[0018] 3) The hand strap passes through the bag hole from the outer wall of the bag opening folded edge, folds upward and sticks to the inner wall of the bag opening folded edge to form a hand fixed section;

[0019] 4) The folded edge of at least one side of the bag opening is folded downward to drive the handle fixing section to be folded downward and glued to the handle patch on the inner wall of the front side;

[0020] 5) Fold the two front sides vertically relative to the bottom surface;

[0021] 6) Folding the bottom edge of the paper inward, then folding the first side surface provided with the extension section inward and gluing it to the bottom edge, and then folding the second side surface inward and gluing it to the bottom edge and the extension section of the first side surface;

[0022] 7) Fold the top overlap downward and adhere it to the extension section of the first sub-side surface and the inner wall of the second sub-side surface;

[0023] 8) Fold the finished paper bag into a flat shape along the side joints and the creases on the bottom.

[0024] The top overlap of the second side surface is connected to the adjacent pocket folded edge as a whole. In step 7), the top overlap and the adjacent pocket folded edge are folded downward together.

[0025] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0026] The paper bag is produced in the form of center sealing on both sides, and the connecting seam is wrapped by the top overlap of the second side surface, so that the paper bag is more beautiful and the connecting seam is protected to have stronger crack resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a connection seam in the prior art.

[0028] Figure 2 Schematic diagram of the initial structure of paper in the first embodiment.

[0029] Figure 3 It is a structural schematic diagram of a handle patch attached to paper in Example 1.

[0030] Figure 4 It is a structural schematic diagram of a paper sheet attached to a portable label in the first embodiment.

[0031] Figure 5 It is a schematic diagram of the structure of the bag opening of the first embodiment after the folded edge is folded downward.

[0032] Figure 6 It is a schematic diagram of the structure of the first embodiment after the two front sides are folded vertically.

[0033] Figure 7 It is a schematic diagram of the structure of the paper after the side of the paper is sealed in the first embodiment.

[0034] Figure 8 It is a schematic diagram of the paper structure after the top overlap edge of the first embodiment is folded downward.

[0035] Fig. 9 It is a schematic diagram of the structure of the paper after being folded into a flat shape in the first embodiment.

[0036] Fig.10 It is a structural schematic diagram of a paper attached to a portable strip in the second embodiment.

[0037] Fig.11 It is a schematic diagram of the structure of the second embodiment after the bag opening fold is folded downward.

[0038] Fig.12 It is a schematic diagram of the structure of the second embodiment after the two front sides are folded vertically.

[0039] Fig.13 It is a schematic diagram of the structure of the paper after the side of the paper is sealed in the second embodiment.

[0040] Fig.14 It is a structural schematic diagram of a paper sheet attached to a portable label in the third embodiment.

[0041] Fig.15 It is a schematic diagram of the structure of the third embodiment after the bag opening fold is folded downward.

[0042] Fig.16 It is a schematic diagram of the structure of the third embodiment after the two front sides are folded vertically.

[0043] Fig.17 It is a schematic diagram of the structure of the paper after the side of the paper is sealed in the third embodiment.

[0044] Fig.18 This is a side view of the paper after it is completed.

[0045] 1- bottom surface; 111- bottom surface crease; 2- front surface; 3- side surface; 4- first sub-side surface; 41- extension section; 5- second sub-side surface; 51- top overlap; 52- inner wall of second sub-side surface; 6- pocket fold; 61- pocket hole; 62- handle patch; 63- hand strap; 64- fixed section; 7- bottom edging; 8- "V" shaped groove; 81- oblique mouth; 9- "V" shaped crease; 10- glue.

[0046] 101-first side edge; 102-second side edge; 103-connecting seam; DETAILED DESCRIPTION

[0047] The present invention will be further described below with reference to specific embodiments of the present invention:

[0048] Embodiment 1:

[0049] A paper bag with a double-sided center seal and a top overlap, comprising a bottom surface 1, two front surfaces 2 and two side surfaces 3, wherein the side surfaces 3 comprise a first sub-side surface 4 and a second sub-side surface 5 which are adhesively connected, the side edge of the first sub-side surface 4 is provided with an extension section 41, and the upper end of the second sub-side surface 5 is provided with a top overlap 51, the top overlap 51 of this embodiment is separated from the bag opening fold 6, the extension section 41 is glued to the inner wall 52 of the second sub-side surface, and then the top overlap 51 is folded downward and glued to the extension end 41, the top overlap 51 covers the top connection seam 103 and provides protection for the connection seam 103, so as to better prevent the top connection seam 103 from cracking.

[0050] The bag opening fold 6 is formed with a bag hole 61, and a handle patch 62 is glued between the front side 2 and the bag opening fold 6. The handle patch 62 is glued to the front side 2, and the fixed section 64 of the hand strap 63 is glued between the handle patch 62 and the bag opening fold 6. From the inside to the outside, they are the bag opening fold 6, the hand strap 63, the handle patch 62 and the front side 2.

[0051] Bottom edges 7 are also provided on both sides of the bottom surface 1 , and the bottom edges 7 are glued to the inner wall of the side surface 3 to adhere the side surface 3 to the bottom surface 1 .

[0052] The first sub-side surface 4 and the second sub-side surface 5 are formed with an oblique opening 81 at one end close to the bottom surface 1, and the two oblique openings form a "V"-shaped groove 8 at the bottom of the side surface. Since the bottom edge 7 is folded relative to the bottom surface 1, the fold is not easy to deform in the direction parallel to the bottom surface. If the first sub-side surface 4 and the second sub-side surface 5 cover the fold of the bottom edge 7 and the bottom surface 1, the part will bulge slightly outward, affecting the appearance. Therefore, the "V"-shaped groove 8 is designed to make the first sub-side surface 4 and the second sub-side surface 5 avoid the fold position, so that the bottom of both sides will not bulge and it is more beautiful.

[0053] A manufacturing process of a double-sided middle-sealed top-lapped paper bag comprises the following steps:

[0054] 1) Cut out paper of corresponding specifications, including corresponding size and corresponding indentation. Indentations include indentation between bottom and side, indentation between front and side, indentation of two pocket fold edges, crease of bottom, and crease between bottom and bottom edge;

[0055] 2) affixing a handle patch 62 to the front side 2 near the folded edge 6 of the bag opening;

[0056] 3) The hand strap 63 passes through the bag hole from the outer wall of the bag fold 6, folds upward and sticks to the inner wall of the bag fold to form a hand fixing section 64; specifically, glue is first applied to the bag fold 6 to glue the hand fixing section 64;

[0057] 4) Both bag opening folds 6 are folded downwards, driving the handle fixing section 64 to be folded downwards and glued to the handle patch 62 on the front inner wall;

[0058] 5) Fold the two front surfaces 2 vertically relative to the bottom surface 1;

[0059] 6) Fold the bottom edge 7 of the paper inward, then fold the first side surface 4 provided with the extension section 41 inward and adhere it to the bottom edge 7, and then fold the second side surface 5 inward and adhere it to the bottom edge 7 and the extension section 41 of the first side surface 4;

[0060] 7) Fold the top overlap 51 downward and adhere it to the extension section 41 of the first sub-side surface 4 and the inner wall 52 of the second sub-side surface;

[0061] 8) Fold the finished paper bag into a flat shape along the connection of the side surfaces and the fold 111 of the bottom surface.

[0062] Embodiment 2:

[0063] The second embodiment is substantially the same as the first embodiment, except that the bag opening fold 6 is connected to the top overlap 51 as a whole, and a corner of the bag opening fold is folded out to form the top overlap 51 .

[0064] In step 4, when the bag opening fold 6 is folded downward, the top overlap 51 is tilted upward and is not glued to the front side. After the first side surface 4 is folded inward and glued to the bottom edge 7, and then the second side surface 5 is folded inward and glued to the bottom edge 7 and the extension section 41 of the first side surface 4, the top overlap 51 is folded downward and glued to the extension end 41.

[0065] Embodiment three:

[0066] The third embodiment is substantially the same as the first embodiment, except that the bag opening fold 6 is connected to the top overlap 51 as a whole, and a “V”-shaped fold 9 is formed between the top overlap 51 and the bag opening fold 6 .

[0067] In step 4, only the bag opening folded edge 6 on the side with the extension section 41 is folded downward, that is, the bag opening folded edge 6 on the side without the top overlap 51 is folded downward, and the bag opening folded edge 6 with the top overlap 51 is not folded. After the first side surface 4 is folded inward and bonded to the bottom edge 7, and then the second side surface 5 is folded inward and bonded to the bottom edge 7 and the extension section 41 of the first side surface 4, since the top overlap 51 and the bag opening folded edge 6 are integrated, they are folded downward at the same time. Due to the existence of the "V"-shaped fold 9, it is more convenient for the bag opening folded edge 6 and the top overlap 51 to be folded downward at the same time.

[0068] The invention has the characteristics of simple structure, more beautiful appearance, increased crack resistance of the connecting seam and thus prolonged service life of the paper bag.

[0069] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A double-sided middle-sealed paper bag with overlapping edges, comprising a bottom surface, front surfaces are arranged on both the front and rear sides of the bottom surface, the two front surfaces are connected by two side surfaces, the side surfaces include a first sub-side surface and a second sub-side surface connected by adhesive, characterized in that: The side edge of the first sub-side surface is provided with an extension section, and the upper end of the second sub-side surface is provided with a top overlap edge, the extension section is glued to the inner wall of the second sub-side surface, and then the top overlap edge is folded down and glued to the extension end to cover the top connection seam; The upper end of the front side is provided with a pocket folding edge, and the pocket folding edge is connected with the top overlap edge as a whole; A "V"-shaped fold is formed between the top overlap and the bag opening fold; A pocket hole is formed on the bag opening fold, and the fixed section of the carrying strap passes through the pocket hole and is glued between the front face and the bag opening fold; A handle patch is glued between the front surface and the folded edge of the bag opening, the handle patch is glued to the front surface, and the fixed section of the handle strip is glued between the handle patch and the folded edge of the bag opening; The bottom surface is also provided with bottom edges on both sides, and the bottom edges are glued to the inner wall of the side surface to adhere the side surface to the bottom surface; The first sub-side surface and the second sub-side surface are both formed with an oblique opening at one end close to the bottom surface, and the two oblique openings form a "V"-shaped groove at the bottom of the side surface, so that the first sub-side surface and the second sub-side surface avoid the folding position of the bottom edge and the bottom surface, so that the bottoms on both sides will not bulge out.

2. A process for making a double-sided middle-sealed top-lapped paper bag as claimed in claim 1, characterized in that: The following steps are involved: 1) Cut out paper of corresponding specifications; 2) Stick the handle patch on the front near the fold of the bag; 3) The hand strap passes through the bag hole from the outer wall of the bag opening folded edge, folds upward and sticks to the inner wall of the bag opening folded edge to form a hand fixed section; 4) The folded edge of at least one side of the bag opening is folded downward to drive the handle fixing section to be folded downward and glued to the handle patch on the inner wall of the front side; 5) Fold the two front sides vertically relative to the bottom surface; 6) Folding the bottom edge of the paper inward, then folding the first side surface provided with the extension section inward and gluing it to the bottom edge, and then folding the second side surface inward and gluing it to the bottom edge and the extension section of the first side surface; 7) Fold the top overlap downward and adhere it to the extension section of the first sub-side surface and the inner wall of the second sub-side surface; 8) Folding the finished paper bag into a flat shape along the joints of the sides and the creases of the bottom; The top overlap of the second side surface is connected to the adjacent pocket folded edge as a whole. In step 7), the top overlap and the adjacent pocket folded edge are folded downward together.

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