Envelope type woven bag with square bottom

Abstract

The utility model relates to an envelope type woven bag with a square bottom. Comprising a bag body made of woven cloth, the bag body comprises a bag body back face, a bag body front face, a bag body left side face and a bag body right side face, and a side face inward folding line which extends in the length direction and is used for being folded inwards is arranged in the middle of the bag body left side face and the bag body right side face. Side face outward folding lines are arranged on the two sides of the side face inward folding line on each side. The edge of the bottom of the bag body in the overlapped state is folded towards one side and is fixedly bonded to achieve sealing, a square bottom is formed when the bottom seal of the bag body is fully opened, and the woven bag is in a flat envelope shape when the woven bag is fully overlapped. The envelope type woven bag with the square bottom is easy to produce and process, waste materials are reduced, the overall structural strength is guaranteed, the structural strength of the bottom is particularly improved, and the problem of bottom leakage is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of packaging bags, and particularly relates to a square-bottom woven bag in an envelope shape. Background Art

[0002] As a packaging article, woven bags have been more and more widely used in the modern packaging industry, and are often used for packaging fertilizers, foods (such as rice), etc. Compared with the traditional large woven bag packaging method, the method of using small-sized and flattened woven bags for packaging is more convenient for stacking and transfer transportation, and is also convenient for users to purchase. Therefore, the method of using small woven bags for product packaging is more and more adopted. Compared with the traditional flattened woven bags, the woven bags with square bottoms have the additional characteristic of standing upright through the bottom, which makes it more convenient for products to be displayed in an upright state and for products to be stacked.

[0003] The specification of Chinese utility model patent CN205801895U discloses a square-bottom woven bag, which includes a piece of woven fabric. Two groups of folding lines for forming two sides of a rectangular bag body are prefabricated in the axial direction of the woven fabric; the upper ends of the woven fabric corresponding to the two sides after unfolding are provided with a symmetrically arranged first step portion and a second step portion, and the lower ends are provided with a symmetrically arranged third step portion and a fourth step portion; the first step portion and the second step portion show a gradually rising trend towards the inside relative to the central axis of the front side, and the third step portion and the fourth step portion show a gradually descending trend towards the inside relative to the central axis; the upper and lower parts of the woven fabric after unfolding are respectively provided with a first folding line and a second folding line in the radial direction. The aforementioned square-bottom woven bag has the disadvantages of being difficult to produce and process, with a cumbersome production process and a large amount of waste. On the other hand, since the square bottom is formed by splicing multiple pieces, the structural strength is low, and the problem of bottom leakage is likely to occur. In summary, it is necessary to develop and design a new type of square-bottom woven bag product to solve the aforementioned technical problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a square-bottom woven bag in an envelope shape, which is easy to produce and process, reduces waste generation, ensures the overall structural strength, and especially improves the structural strength of the bottom, avoiding the problem of bottom leakage.

[0005] The technical solution adopted by the utility model is as follows: a square-bottom woven bag in the shape of an envelope, including a bag body made of woven fabric. The bag body includes a back surface of the bag body, a front surface of the bag body, a left side surface of the bag body, and a right side surface of the bag body. At the middle position between the left side surface and the right side surface of the bag body, there is a side inward folding line extending along the length direction and used for folding inward, and side outward folding lines are provided on both sides of the side inward folding line on each side; the bottom edge of the bag body in the superposed state is folded to one side and bonded and fixed to achieve sealing. When the bottom seal of the bag body is fully opened, a square bottom is formed. When the woven bag is fully superposed, it becomes a flat envelope shape.

[0006] Preferably, bottom bonding layers are provided at both the front and rear of the bottom edge of the bag body in the superposed state. The bottom edge of the bag body is first folded to the side for the first time and bonded and fixed using the bottom bonding layer. Then, the aforementioned folded and bonded part is folded to the same side for the second time and bonded and fixed using the bottom bonding layer.

[0007] Preferably, the bag body is made of the same piece of woven fabric and is spliced and closed at the middle position of the front surface of the bag body; a first bonding layer is provided inside the inner edge of one end of the woven fabric, and a second bonding layer is provided outside the outer edge of the other end of the woven fabric. The two end edges of the woven fabric are overlapped and bonded and fixed using the first bonding layer and the second bonding layer.

[0008] Preferably, the woven fabric includes a woven layer, and a plastic film layer is covered on the outside of the woven layer.

[0009] The advantages and positive effects of the utility model are as follows:

[0010] The utility model provides a square-bottom woven bag in the shape of an envelope with a reasonable structural design. When fully opened and used, due to the square bottom at the bottom, the products after packaging can be in an upright state. When not in use, it can be fully superposed into an envelope shape, so that it can be stacked and stored, reducing the occupation of space and being convenient for taking. Compared with the existing square-bottom woven bags, the square bottom of the square-bottom woven bag in the utility model is formed by folding the superposed bottom edge of the bag body to the side and bonding and sealing, which solves the problems existing in the existing square-bottom woven bags: firstly, it can avoid the problem of cumbersome production processes caused by multi-piece spliced square bottoms (no need for cutting and multi-position bonding), and there will be no excessive waste generated during the processing (no need to cut the connecting pieces required for forming the square bottom); secondly, the structural form of folding the bottom edge of the bag body to the outside and completely bonding and sealing can effectively ensure the structural strength of the square bottom, and further significantly improve the structural strength of the entire square-bottom woven bag, and can effectively avoid the problem of bottom leakage after packaging. Description of the Drawings

[0011] Figure 1 is the front view structural schematic diagram of the utility model, and the woven bag is in the opened state;

[0012] Figure 2 is a schematic side view structure diagram of the present utility model, and the woven bag is in an expanded state;

[0013] Figure 3 is Figure 1 a schematic cross-sectional structure diagram of part A in , and the square bottom is in an unfolded state;

[0014] Figure 4 is a schematic cross-sectional structure diagram of the present utility model when it is in an expanded state;

[0015] Figure 5 is a schematic side view structure diagram of the present utility model, and the woven bag is in a stacked state.

[0016] In the figure:

[0017] 1. Back of the bag body; 2. First adhesive layer; 3. Second adhesive layer; 4. Front of the bag body; 5. Right side of the bag body; 6. Seam; 7. Left side of the bag body; 8. Square bottom; 9. Inner folding line of the side; 10. Bottom adhesive layer; 11. Outer folding line of the side. Detailed implementation manners

[0018] To further understand the content, features and effects of the present utility model, the following embodiments are given for detailed description.

[0019] Please refer to Figure 1 and Figure 2 , the envelope-shaped square-bottom woven bag of the present utility model includes a bag body made of woven fabric, and the bag body includes the back 1 of the bag body, the front 4 of the bag body, the left side 7 of the bag body and the right side 5 of the bag body. Figure 1 and Figure 2 comprehensively show the state of the square-bottom woven bag when it is fully expanded. It can be seen that when it is fully expanded, the whole square-bottom woven bag is in the shape of a flat cuboid, with an open top, a sealed bottom and a square bottom 8. Goods are placed into the interior of the woven bag through the open top and the top is sealed.

[0020] It should be noted that the square bottom 8 mentioned in this patent does not mean that the bottom of the woven bag is completely flat after being expanded. The square bottom 8 is an image statement. Compared with other shaped woven bags (which cannot stand upright due to not having a square bottom), after goods are placed into the present square-bottom woven bag, it can be in an upright state through the contact between the square bottom 8 and the supporting surface (such as the ground).

[0021] Such as Figure 2 and Figure 4As shown, a side inward folding line 9 extending in the length direction for inward folding is provided at the middle position of both the left side 7 and the right side 5 of the bag body. Side outward folding lines 11 are provided on both sides of the side inward folding line 9 on each side. From Figure 4 the cross-sectional structure shown, both the left side and the right side are in an M-shaped configuration. This square-bottom woven bag is in the Figure 5 superposed state shown when leaving the factory and only expands into the Figure 2 state shown during use.

[0022] In this embodiment, the bag body is made of a single piece of woven fabric and is spliced and closed at the middle position of the front side 4 of the bag body. Figure 1 and Figure 4 show the way of splicing and closing. Specifically, a first adhesive layer 2 is provided on the inner side of one end edge of the woven fabric, and a second adhesive layer 3 is provided on the outer side of the other end edge. The two end edges of the woven fabric are overlapped and bonded and fixed by the first adhesive layer 2 and the second adhesive layer 3.

[0023] In this embodiment, the woven fabric includes a woven layer, and a plastic film layer is covered on the outer side of the woven layer. The outer plastic film layer plays a role in waterproofing, making the appearance smooth and flat to improve the appearance effect and being easy to print graphics and texts. It can be imagined that a plastic film layer can also be provided on the inner side of the woven layer to further improve the moisture-proof effect. The aforementioned plastic film layer can also enhance the overall structural strength of the woven bag.

[0024] Please refer to Figure 2 、 Figure 3 and Figure 5 , and it can be seen that:

[0025] The bottom edge of the bag body in the superposed state is folded to one side and bonded and fixed to achieve sealing. When the bottom seal of the bag body is fully expanded, it forms the Figure 2 square bottom 8 shown. When the woven bag is fully superposed, it becomes flat and envelope-shaped as shown in Figure 5 .

[0026] In this embodiment, the following specific method is adopted to seal the bottom edge of the bag body to form the square bottom 8: Bottom adhesive layers 10 are provided at both the front and the rear of the bottom edge of the bag body in the superposed state. The bottom edge of the bag body is first folded to the side (shown as the side facing the back side 1 of the bag body in the figure) for the first time and bonded and fixed by the bottom adhesive layer 10. Then, the aforementioned folded and bonded part is folded to the same side for the second time and bonded and fixed by the bottom adhesive layer 10.

[0027] Further, an adhesive layer can also be provided inside the bottom edge of the bag body, that is, inside the bottom edges of the back surface 1, the front surface 4, the left side surface 7, and the right side surface 5 of the bag body. In this way, when the bottom edges of the bag body are overlapped, an adhesive effect is also generated inside, which can further enhance the bonding structure strength of the bottom and further ensure the sealing performance of the bottom.

[0028] Production method:

[0029] After the square-bottom woven bag is fully unfolded, it becomes a rectangular woven fabric. Therefore, a woven fabric of a specific size is cut, and then inward folding lines 9 and outward folding lines 11 for the sides are processed at corresponding positions on the woven fabric. Then, a first adhesive layer 2 and a second adhesive layer 3 are provided at the two end edges of the woven fabric, and the two end edges are overlapped and bonded and closed using the first adhesive layer 2 and the second adhesive layer 3. At this time, the Figure 4 tubular bag body shown in

[0030] is formed. Then, a bottom adhesive layer 10 is provided at the bottom edge of the bag body. Figure 3 The folding direction is indicated by an arrow in . Specifically, first fold it to one side and bond and fix it using the bottom adhesive layer 10, and then fold it again and bond and fix it using the bottom adhesive layer 10. Finally, the square-bottom woven bag is pressed into the Figure 5 envelope shape shown in as the factory state.

[0031] Usage method:

[0032] Take the square-bottom woven bag and fully expand the woven bag to the Figure 2 state shown in . Load the goods into the woven bag and seal the top of the woven bag.

Claims

1. An envelope-type square bottom woven bag, characterized by: The invention relates to a bag body made of woven cloth, wherein the bag body comprises a back side (1), a front side (4), a left side (7) and a right side (5). A side inward folding line (9) extending along the length direction and used for folding inward is provided in the middle of the left side (7) and the right side (5). Side outward folding lines (11) are provided on both sides of the side inward folding line (9) on each side. The bottom edge of the bag body in a folded state is folded to one side and bonded to achieve sealing. When the bottom seal of the bag body is fully opened, a square bottom (8) is formed. When the woven bag is fully folded, it becomes a flat envelope shape.

2. The envelope-type square bottom woven bag as claimed in claim 1, characterized in that: The bag body is made of the same piece of woven cloth and is spliced ​​and closed at the middle position of the front side (4) of the bag body; a first adhesive layer (2) is provided on the inner side of one end edge of the woven cloth and a second adhesive layer (3) is provided on the outer side of the other end edge; the two end edges of the woven cloth are overlapped and are bonded and fixed by the first adhesive layer (2) and the second adhesive layer (3).

3. The envelope-type square bottom woven bag as claimed in claim 2, characterized in that: The woven cloth comprises a woven layer, and a plastic film layer is covered on the outer side of the woven layer.

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