CN216835076U - Square bottom leakage-proof woven packaging bag - Google Patents

Abstract

The utility model relates to a square bottom leakproof woven packaging bag, wherein the left side and the right side of the bottom of a barrel body bag body are respectively provided with a first turnover part which is turned over towards the middle direction, the front side and the rear side of the bottom of the barrel body bag body are respectively provided with a second turnover part which is turned over towards the middle direction, and the second turnover part is positioned at the lower layer of the first turnover part; the front end and the rear end of the first folding part are respectively provided with an angle folding part which is folded along with the second folding part; the lower layers of the first folding part and the second folding part are also provided with a sealing piece, and the sealing piece is connected with the second folding part and the first folding part. It turns over a bottom of the stack shell bag body and turns over a book formation and turns over a structure through first book portion and second book portion of turning over, carries out the back cover by the back cover piece again and connects, and first book portion and second book portion of turning over after will turning over are fixed, do not let a structure of turning over scatter, the sound construction, leak protection ability reinforcing forms the four sides end of sack, and the sack expandes the back end and is the square form, and is more practical.

Description

Square bottom leakage-proof woven packaging bag

Technical Field

The utility model relates to a wrapping bag, in particular to leak-proof woven packaging bag of square end.

Background

The square bottom leakproof woven packaging bag is a type of packaging plastic bag, is also called as a woven bag, has low cost, convenient use, recoverability and relative environmental protection, is widely applied to various packaging industries, such as the packaging of flour, chemical fertilizer, grain, silt and other fields, and is particularly suitable for the packaging of particles and powder. Wherein, the bottom of the body bag body of the leak-proof woven packaging bag of square end adopts to make up the back cover, and is impractical relatively, and flat more practical at present, flat mode structure is various in addition, and stable in structure and leak protection performance are crucial again, especially can pressurize in granule, powder packaging process, prop brokenly easily, leak easily.

SUMMERY OF THE UTILITY MODEL

In view of the technical problem that exists among the background art, the utility model aims at providing a leak-proof woven packaging bag of square end. The bottom of the folding structure is formed and is connected with the back cover through the back cover sheet, so that a square bottom is formed, the leakage-proof capacity is enhanced, the structure is firm, and the folding structure is more practical.

In order to solve the technical problem, the utility model discloses a following technical scheme: the leak-proof woven packaging bag of square end, including the stack shell bag body, its characterized in that: the left side and the right side of the bottom of the cylinder body bag body are respectively provided with a first folding part folded towards the middle direction, the front side and the rear side of the bottom of the cylinder body bag body are respectively provided with a second folding part folded towards the middle direction, and the second folding part is positioned at the lower layer of the first folding part; the front end and the rear end of the first folding part are respectively provided with an angle folding part which is folded along with the second folding part; the lower layers of the first folding part and the second folding part are also provided with a sealing piece, and the sealing piece is connected with the second folding part and the first folding part. Wherein, turn over a bottom that the portion turns over the stack shell bag body through first book portion and second and turn over a formation and turn over a structure, carry out the back cover by the back cover piece again and connect, will turn over a first book portion and the second of turning over after the book and turn over a portion and fix, do not let a structure scatter, the sound construction, leak protection ability reinforcing forms the square bottom of sack, and the sack expandes the back bottom and is the square form, and is more practical, and article such as granule, powder are put into the back and stand more stably.

The following various optimization or supplementary explanations may be made in the above technical solutions.

For example, a first connecting through hole is formed in the first folded part, a second connecting through hole is formed in the second folded part, and the first connecting through hole and the second connecting through hole are arranged in a vertically corresponding manner to form an additional connecting channel; the bottom sealing sheet is additionally connected with the first folding part through an additional connecting channel. First connect the via hole and the second connect the via hole that correspond from top to bottom will communicate to the back cover piece can also carry out additionally through first connect the via hole and second connect the via hole (the extra interface channel that forms) and first folding portion when the back cover is connected, increase the position that additionally links to each other, the back cover is more firm, seal the regional mouth of dog-ear portion inside the sack when additionally linking to each other, further avoid turning over a structure (especially the regional mouth of dog-ear portion) of sack to be propped brokenly, the problem of leakage. Wherein the first connecting through hole and the second connecting through hole which are corresponding up and down are communicated with each other.

It is also preferable that the first connection through hole and the second connection through hole are circular through holes. The round holes are convenient to process, the contact area is relatively large, particularly, the range of mutual corresponding communication after the folding is large, and more space positions for connecting the bottom sealing plate and the folding structure are ensured, so that the bottom sealing plate is firmer.

And optimizing, wherein the first connecting through hole and the second connecting through hole are respectively internally tangent with the triangular area of the folded corner part. The first connecting through hole and the second connecting through hole are close to the edge position of the folded angle part as much as possible, the area of the holes is relatively larger, the channel for connection is larger, and the sealing effect is good and firmer.

For another example, the bottom sealing sheet is a square bottom sealing sheet, and the bottom sealing sheet is sealed below the first folding portion and the second folding portion. The square bottom sealing sheet is connected in a sealing mode, the sealing technology is mature, the material of the square bottom sealing sheet is saved, and the square bottom sealing sheet can be conveniently and smoothly unfolded to form a square bottom.

For example, the bottom sealing sheet is a rectangular bottom sealing sheet, the long edge of the bottom sealing sheet is matched with the folded edge of the second folded part, the short edge of the bottom sealing sheet is matched with the distance between the folded edges of the second folded parts on the front side and the rear side, the bottom sealing sheet is matched with and attached to the rectangular bottom of the bag, and the material of the bottom sealing sheet is saved.

For example, the sealing sheet is made of plastic material, and the sealing sheet is connected with the first folding part and the second folding part in a heat sealing manner. The sealing connection adopts a heat-sealing mode, so that the sealing is more convenient.

And additionally, the second folding parts at the front side and the rear side are mutually overlapped towards the middle end part. That is, the end portions of the second folded portions at the front and rear sides will have the overlapping portions, thereby further enhancing the firmness of the folded structure.

The beneficial effects of the utility model are that, in this square bottom leak-proof woven packaging bag, turn over a book formation and turn over a structure through first book portion and second book portion of turning over in the bottom of the stack shell bag body, rethread film of sealing carries out the back cover and connects, turn over a structure that a cooperation formed of book portion is turned over to first book portion and second and be connected fixedly, additional strengthening firmness when reinforcing leak protection ability, it scatters to avoid rolling over a structure, thereby form the cubic bottom structure of sack, when the sack expandes the use, the end of sack is the square form, and is more practical, the sack stands more stably. In addition, can also additionally increase first connecting through hole and second connecting through hole and carry out additionally linking to each other with first folding portion, the back cover is more firm, and carries out the sealing of mouth about the dog-ear portion, further avoids the bottom of sack to turn over a structure and is propped brokenly and the risk of revealing. Therefore, compared with the prior art, the utility model has substantive characteristics and progress.

Drawings

The following describes details and operational principles of embodiments and examples of the present invention with reference to the drawings.

Fig. 1 is a schematic structural view of the middle body bag of the present invention, wherein the bottom is forward.

Fig. 2 is a state diagram of the first folded part of the present invention.

Fig. 3 is a schematic diagram of the structure of fig. 2 further illustrating the structure.

Fig. 4 is a schematic structural view of the second folded part in the folding process in fig. 3.

Fig. 5 is a schematic structural view of the second folded part in fig. 4 folded and provided with a bottom sheet.

FIG. 6 is a schematic view of the joined backsheet of FIG. 5.

Fig. 7 is a schematic view of another angle structure of the first folding portion after the folding process and the second folding portion during the folding process, wherein the rear side is below.

Fig. 8 is a schematic view of the second folded part of fig. 7 further folded.

Fig. 9 is a schematic structural view of the second folded part in fig. 8 after being folded.

Fig. 10 is a schematic structural view of the film of fig. 9 with the film cover attached.

Fig. 11 is a schematic view of another embodiment of fig. 3.

Fig. 12 is a schematic view of another embodiment of fig. 4.

Fig. 13 is a schematic view of another embodiment of fig. 5.

Fig. 14 is a schematic view of another embodiment of fig. 7.

Fig. 15 is a schematic view of another embodiment of fig. 8.

Fig. 16 is a schematic view of another embodiment in fig. 9.

Fig. 17 is a schematic view of another embodiment of fig. 10.

Fig. 18 is a schematic view showing a structure in which the ends of the second flap of fig. 5 are overlapped with each other.

Fig. 19 is a schematic view of the three-dimensional structure of the inner square bottom of the packing bag of the present invention.

Fig. 20 is a schematic view of the structure of fig. 19 in a state where the openings are opened.

Fig. 21 is a schematic structural view of the device of fig. 20 with the first and second connecting vias, wherein the bottom cover sheet is shown in a separated state.

In the figure: 1. a barrel body bag body; 2. a first fold-over portion; 3. a second fold-over portion; 4. a folded corner portion; 5. sealing the bottom plate; 6. a first connecting through hole; 7. a second connecting through hole; 8. a long side; 9. a short side; 10. folding edges; 11. an end portion; 12. a folding structure; 13. a lap zone; 14. a bottom; 15. and (5) opening the mouth.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

Referring to all the drawings, the square bottom leakproof woven packaging bag in the embodiment of the present embodiment includes a body bag 1.

The left and right sides (left and right directions in fig. 2) of the bottom 14 of the tubular bag body 1 are respectively folded toward the middle direction to form a first folded part 2.

The front and rear sides (up and down in fig. 2) of the bottom 14 of the tubular bag 1 are respectively folded toward the middle to form a second folded part 3.

The turnover can be processed in the modes of opening, guiding, folding and the like. Generally, the barrel body bag body 1 is flattened from front to back and is folded after being flattened, and the barrel body bag body 1 is folded again (forming a first folding part 2 and a second folding part 3) in a front-back flat state, so that the forming is smoother and the forming effect is better.

The first folding part 2 is folded first, and then the second folding part 3 is folded, that is, the second folding part 3 is located at the lower layer of the first folding part 2.

The first folded part 2 is folded to form a triangular area (generally, an isosceles right angle, and then two end angles are folded to form a folded part 4), and the second folded part 3 is folded to form a trapezoidal area.

The front end and the rear end of the first folding part 2 are respectively provided with a folded angle part 4 folded along with the second folding part 3; that is, when the second folded part 3 is folded, the folded parts 4 are formed by folding the front and rear end regions of the first folded part 2 for the second time. A gap 15 (i.e. a gap 15 in the region of the folded part 4) is left between the folded part 4 and the first folded part 2 and the second folded part 3 which are not folded twice, as shown in fig. 20.

The first folded part 2 (including the folded corner part 4) and the second folded part 3 are matched to form a folded structure 12 at the bottom of the bag.

The lower layer of the first folded part 2 and the second folded part 3 is also provided with a sealing piece 5, the sealing piece 5 is connected with the second folded part 3 and the first folded part 2 (can be bonded or hot-stamped and closed and the like), the folding structure 12 is fixedly connected through the sealing piece 5, the first folded part 2 and the second folded part 3 after being folded are prevented from being scattered, the folding structure 12 can be sealed and fixed, and the materials are prevented from leaking from the folding mechanism.

In this leak-proof woven packaging bag of square bottom, turn over a book formation and turn over a structure 12 successively through first folding portion 2 and second folding portion 3 in the bottom 14 of the stack shell bag body 1, rethread film 5 carries out the back cover and connects (the dual function of back cover and connection), it is fixed to turn over a structure 12 that first folding portion 2 and the cooperation of second folding portion 3 formed, additional strengthening firmness when reinforcing leak protection ability, avoid turning over a structure 12 and scatter, thereby form the cubic bottom structure of sack, be the square form when the sack expandes the back end, and is more practical, the sack stands more stably. The common types of the packaging bag are a square valve bag, a single-bottom square bag and the like, and the square bottom structure of the utility model is adopted.

The following optimization or further explanation can be made on the basis of the above embodiments, respectively.

Referring to fig. 11 to 21, for example, the first folding portion 4 is provided with a first connecting through hole 6, the second folding portion 3 is provided with a second connecting through hole 7, and the first connecting through hole 6 and the second connecting through hole 7 are correspondingly arranged up and down to form an additional connecting channel. That is, the folded structure 12 is formed, and an extra area of the first folded portion 2 is exposed by the extra connecting channel, so that the back cover 5 and the first folded portion 2 can be additionally connected. The first connecting through hole 6 and the second connecting through hole 7 which correspond up and down are communicated with each other, so that when the back cover sheet 5 is connected at the back cover, the back cover sheet 5 can be additionally connected with the first folded part 2 through the first connecting through hole 6 and the second connecting through hole 7 (namely, additional connecting channels), the connecting position is increased, the back cover is firmer, the opening 15 in the folded part 4 area inside the bag (especially the opening 15 between the folded part 4 and the first folded part 2 which is not folded twice) is sealed while the back cover sheet is additionally connected, the opening 15 is smoother, and the problems that the folded structure 12 of the bag (especially the opening 15 in the folded part 4 area) is propped open, propped open and leaked are further avoided.

Preferably, the first and second connection through holes 6 and 7 are circular through holes. The circular through holes are relatively convenient to process, such as punching, waste discharge is relatively smooth, the area of the circular through holes is relatively large, particularly, the range of mutual corresponding communication after the folding is relatively large, and more space positions for connecting the bottom sealing plate 5 and the folding structure 12 are ensured, so that the bottom sealing plate is firmer. First connection through-hole 6 and second connecting through-hole 7 are when punching, can punch on the relevant position of the first portion of turning over 2 that turns over a book earlier, punch to the second portion of turning over (the second portion of turning over 3 is not turned over at this moment), directly once form first connection through-hole 6 and second connecting through-hole 7, turn over a second portion of turning over 3 that corresponds again afterwards, it turns over a book to punch earlier, it is convenient to punch, first connecting through-hole and second connecting through-hole preparation are convenient, but can lead to first connection through-hole 6 and second connecting through-hole 7 certain position that staggers (misplace promptly), adopt circular through-hole will minimize the influence that the dislocation brought, it is relatively great that the second portion of turning over 3 turns over a range that first connection through-hole 6 and second connecting through-hole 7 correspond the intercommunication each other after turning over, and processing preparation is convenient.

Further, the first connecting through hole 6 and the second connecting through hole 7 are inscribed in the triangular regions of the folded corner portions 4, respectively. The first connecting through hole 6 and the second connecting through hole 7 are close to the edge position of the folded corner part 4 as much as possible, the areas of the first connecting through hole 6 and the second connecting through hole 7 are relatively larger, the channel for connection is larger, the sealing effect is good, and the sealing effect is firmer.

For another example, the bottom sealing sheet 5 is a square bottom sealing sheet (e.g., a square or rectangular square bottom sealing sheet), and the bottom sealing sheet 5 is sealed under the first folded portion 2 and the second folded portion 3, i.e., sealed under the folded structure 12. The square bottom sealing structure is connected in a sealing mode, the sealing technology is mature, the material of the square bottom sealing sheet is saved, the square bottom sealing structure is more attached to and matched with the square bottom, and the square bottom sealing structure can be conveniently and smoothly unfolded to form the square bottom.

For example, the back cover sheet 5 is a rectangular back cover sheet, the long edge 8 of the back cover sheet 5 is matched with the folded edge 10 of the second folded part 3, the second folded part 3 is folded along the folded edge 10 towards the middle direction, the short edge 9 of the back cover sheet 5 is matched with the space between the folded edges 10 of the second folded parts 3 at the front side and the rear side, and the back cover sheet 5 is matched with and attached to the rectangular square bottom of the bag, so that the rectangular square bottom is formed, the practicability is wider, and the material of the back cover sheet 5 is saved.

For example, the bottom sealing sheet 5 is made of plastic, and is generally made of a material that is the same as the body bag 1, i.e., a plastic woven material, and the bottom sealing sheet 5 is heat-sealed and connected to the first folded part 2 and the second folded part 3. The sealing connection adopts a heat-sealing mode, so that the sealing is more convenient.

In addition, with additional optimization, referring to fig. 18, the front and rear second folded parts 3 overlap each other toward the middle end 11, that is, the front and rear second folded parts 3 of the bottom 14 of the body pocket 1 overlap each other toward the middle end 11 to form a lap zone 13, with one end 11 on top and the other end 11 on bottom. The second folded part 3 is overlapped with the end part 11 of the second folded part 3, so as to further enhance the firmness and strength of the folded structure 12.

The foregoing is a preferred embodiment of the present invention, and it should be noted that the scope of the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. The leak-proof woven packaging bag of square end, including the stack shell bag body (1), its characterized in that:

the left side and the right side of the bottom (14) of the cylinder body bag body (1) are respectively provided with a first folding part (2) which is folded towards the middle direction,

the front side and the rear side of the bottom (14) of the barrel bag body (1) are respectively provided with a second folding part (3) which is folded towards the middle direction,

the second folding part (3) is positioned at the lower layer of the first folding part (2);

the front end and the rear end of the first folding part (2) are respectively provided with a folding angle part (4) which is folded along with the second folding part (3);

the lower layers of the first folding part (2) and the second folding part (3) are also provided with a bottom sealing sheet (5), and the bottom sealing sheet (5) is connected with the second folding part (3) and the first folding part (2).

2. The square bottom leakproof woven bag of claim 1, further comprising:

a first connecting through hole (6) is formed in the first folding part (4), a second connecting through hole (7) is formed in the second folding part (3), and the first connecting through hole (6) and the second connecting through hole (7) are arranged in an up-and-down corresponding mode to form an additional connecting channel;

the bottom sealing sheet (5) is additionally connected with the first folding part (2) or the second folding part (3) through an additional connecting channel.

3. The square bottom leakproof woven bag of claim 2, further comprising: the first connecting through hole (6) and the second connecting through hole (7) are circular through holes.

4. The square bottom leakproof woven bag of claim 3, wherein: the first connecting through hole (6) and the second connecting through hole (7) are respectively internally tangent with the triangular area of the folded corner part (4).

5. The square bottom leakproof woven bag of claim 1, further comprising: the bottom sealing sheet (5) is a square bottom sealing sheet, and the bottom sealing sheet (5) is sealed below the first folding part (2) and the second folding part (3).

6. The square bottom leakproof woven bag of claim 1, further comprising: the bottom sealing piece (5) is a rectangular bottom sealing piece, the long side (8) of the bottom sealing piece (5) is matched with the folded edge (10) of the second folded part (3), and the short side (9) of the bottom sealing piece (5) is matched with the distance between the folded edges (10) of the second folded parts (3) on the front side and the rear side.

7. The square bottom leakproof woven bag of claim 1, further comprising: the bottom sealing sheet (5) is made of plastic materials, and the bottom sealing sheet (5) is connected with the first folding part (2) and the second folding part (3) in a heat sealing mode.

8. The square bottom leakproof woven bag of claim 1, wherein: the second folding parts (3) at the front and the rear sides are mutually overlapped towards the middle end part (11).

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