M-fold bag and process for producing same

Abstract

The application discloses a bag base cloth, an M-folded bag and a production process thereof, relates to the technical field of bag base cloth, and comprises a base cloth body, the base cloth body is woven into a cylindrical shape by polypropylene wire drawing, and an inner adhesive film is coated in the base cloth body; the base cloth body and the inner adhesive film are preheated and softened, and then are formed by an M-folded forming machine, the base cloth body is wound into a roll in the M-folded state; the free end of the base cloth body in the rolled state is subjected to layered hot pressure welding to form a welded surface, and the welded surface is symmetrically cut; a cutting interval of the two welded surfaces forms a feeding port and a hanger strap split body, and the two hanger strap split bodies are connected into a hanger strap by sewing thread; the lower end of the base cloth body is integrally cut and sealed by sewing thread to form a bag bottom; and the hanger strap is connected with the bag body and the bag bottom. The bag base cloth, the M-folded bag and the production process thereof have the advantages that the use of manual labor is reduced by automatic production, the hanger strap is integrally formed with the bag, and the strength and sealing performance of the bag are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packing bags, in particular to an M-fold packing bag and a production process thereof. BACKGROUND

[0002] A packing bag is a flexible transport packaging container, which is widely used in the transportation and packaging of powdery, granular and blocky goods such as food, grain, medicine, chemical industry and mineral products, and has the characteristics of low price, firmness, moisture resistance and sun protection.

[0003] The existing packing bag includes a surrounding bag and a sling, and has too many processing procedures. The sling is sewn on the packing bag by hand in the later stage, which on the one hand leads to insufficient strength of the sling, and uneven stress in the lifting process, so that the lifting part and the side bag of the packing bag are easily torn, the structure of the packing bag is damaged, the goods in the packing bag are spilled, and the work efficiency is affected. On the other hand, material leakage is prone to occur at the sewing position during use, and the stitch pitch and stitch of the sewing edge are not easy to guarantee consistency and standardization, and the sealing performance is not easy to guarantee during the process of manual sewing. Furthermore, it is not easy to realize automatic production, and a large amount of manual labor is required in the production process of the packing bag.

[0004] How to develop an M-fold packing bag and a production process thereof, reduce the amount of manual use by using automatic production, and make the sling and the packing bag integrally formed to improve the strength of the packing bag, reduce the area of the sewing position, and improve the sealing performance of the packing bag, has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0005] The purpose of the present application is to provide an M-fold packing bag and a production process thereof, which solves the problems listed in the background art.

[0006] To solve the above technical problems, the technical scheme is as follows:

[0007] The M-fold packing bag of the present application comprises a base cloth body, the base cloth body is woven into a cylindrical shape by polypropylene wire drawing, and the inside of the base cloth body is coated with an inner adhesive film; the base cloth body and the inner adhesive film are preheated and softened, and then formed by an M-fold forming machine, and the base cloth body is wound into a roll by M-fold;

[0008] The peeling degree of the base cloth body and the inner adhesive film is not less than 1.2N / 15mm, and the tensile strength in the longitudinal direction is not less than 1800N / 5cm;

[0009] The free end of the base cloth body in the coiled state is subjected to layered heat pressure welding to form a welding surface, and the welding surface is symmetrically cut;

[0010] The cutting interval of the two welding surfaces forms a feeding port, and the welding surfaces and the sidewall of the base fabric body form a sling part, and the two sling parts are connected by a sewing line to form a sling.

[0011] The lower end of the base fabric body is cut as a whole and sealed by the sewing line to form a bag bottom.

[0012] The sling is connected to the bag body and the bag bottom.

[0013] Preferably, the bag body and the feeding port are square when unfolded.

[0014] Preferably, the bag bottom 5 is in a V shape with two opposite sharp ends.

[0015] The production process of the M-fold packaging bag comprises the following steps:

[0016] S1, silk making, polypropylene particles are made into silk or sheet shape after stirring and melting by an extruder;

[0017] S2, circular weaving, polypropylene silk or polypropylene tape is woven into a cylindrical base fabric body by a circular weaving machine;

[0018] S3, applying an inner adhesive film, an inner adhesive film is applied on the inner wall of the base fabric body by an inner adhesive film machine;

[0019] S4, M-fold forming, after the base fabric body and the inner adhesive film are preheated and softened, the M-fold forming mechanism on the production line is used for forming and winding into a roll;

[0020] S5, sling part and feeding port forming, the free end of the M-fold base fabric is layered and hot-pressed, and after welding, the welding surface is symmetrically cut to form a sling part and a feeding port;

[0021] S6, printing, according to the production needs, printing characters on the outer surface of the bag body;

[0022] S7, sling part butt joint, two sling parts are connected by a sewing line to form a closed sling;

[0023] S8, M-fold base fabric lower end cutting, when the M-fold base fabric reaches the preset length of the packaging bag, the connection between the M-fold base fabric and the roll is automatically cut off by the machine;

[0024] S8, bag bottom sealing, the M-shaped bending area at the lower end of the base fabric is sealed by a sewing line;

[0025] S9, the free end of the M-fold base fabric roll continues to repeat the steps S5-S8 to complete the production and processing of the packaging bag.

[0026] Preferably, the S5 step comprises separately hot-pressing the two V-shaped folds of the M-fold base fabric by a hot-pressing machine, and cutting along the center line of the welding surface by a partially open circular cutting knife.

[0027] Preferably, the length of the blade of the partially-blunted circular cutting knife is equal to the length of the welding surface, and the length of the unblunted part of the circular cutting knife is equal to the length of the bag body.

[0028] Compared with the prior art, the present application has the following beneficial technical effects:

[0029] The M-folded packing bag and the production process thereof realize the assembly line production by directly weaving the base fabric body into a cylindrical shape and performing M-type folding, thereby improving the product quality, reducing the use amount of manual sewing and sewing machines, reducing energy consumption and labor cost, further reducing the floor area of the factory, and ensuring the sealing performance and the strength of the packing bag. BRIEF DESCRIPTION OF DRAWINGS

[0030] The present application will be further described below in combination with the description of the drawings.

[0031] Figure 1 It is a front view of the M-folded packing bag (without filling material) of the present application.

[0032] Figure 2 It is a front view of the M-folded packing bag (with filling material) of the present application.

[0033] Figure 3 It is a side view of the M-folded packing bag (with filling material) of the present application.

[0034] Figure 4 It is a perspective view of the M-folded packing bag (with filling material) of the present application.

[0035] Figure 5 It is a perspective view of the M-folded packing bag (with filling material) of the present application. Figure 1 It is a perspective view of the M-folded packing bag (with filling material) of the present application.

[0036] Figure 6 It is a perspective view of the M-folded packing bag (with filling material) of the present application. Figure 2 It is a perspective view of the M-folded packing bag (with filling material) of the present application.

[0037] Figure 7 It is an enlarged view of part A of the present application (with the joint disassembled).

[0038] The reference signs are as follows: 1, base fabric body; 101, first hanging strap horizontal edge; 102, second hanging strap horizontal edge; 103, first hanging strap vertical edge; 104, second hanging strap vertical edge; 105, first inlet port vertical edge; 106, second inlet port vertical edge; 107, bag bottom opening; 2, bag body; 3, hanging strap; 4, inlet port; 5, bag bottom; 6, sewing line; 7, welding surface. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] like Figures 1-7 As shown, the M-fold container bag includes a base fabric body 1, which is woven into a cylindrical shape by drawing polypropylene, and the interior of the base fabric body 1 is coated with an inner mucosa; the base fabric body 1 and the inner mucosa are preheated and softened and then formed by an M-fold forming machine. This forming method can realize automatic bag making in the subsequent processing of the bag, and the bag shape is flatter, with fewer wrinkles and gaps, thereby improving the sealing and appearance of the bag. The M-folded base fabric body 1 is wound into a roll; by directly weaving the base fabric body into a cylindrical shape and performing M-folding, assembly line production is realized, which not only improves the quality of the product, but also reduces the amount of labor and sewing machinery used during manual sewing, while reducing energy consumption and labor costs, and further reducing the factory's floor space;

[0041] The peeling degree between the base fabric body 1 and the inner mucosa is not less than 1.2N / 15mm, the tensile strength is not less than 1800N / 5cm in the longitudinal direction and not less than 2000N / 5cm in the transverse direction, and the weight range of the base fabric body and the inner mucosa is 100-200g / m 2 At the same time, the base fabric material should be added with an appropriate amount of anti-ultraviolet agent. After aging resistance test, the material should be exposed outdoors for 2 years and its strength retention rate should be no less than 70% of the initial strength.

[0042] The free end of the curled base fabric body 1 is subjected to layered hot-pressing welding to form a welding surface 7. The welding surface 7 is symmetrically cut to form a U-shaped welding surface. The seams of the container bag that are not subjected to stress are welded by hot-pressing welding to ensure the sealing performance of the seams of the container bag.

[0043] The cutting area of ​​the two welding surfaces 7 forms a feed port 4, and a sling split is formed between the welding surface 7 and the side wall of the base fabric body 1. The two sling splits are connected to form a sling 3 by stitches 6. The seams of the sling splits need to withstand a large tensile force, and there is no filling material at the seams of the sling, so there is no need to consider the risk of leakage, so stitches are used for connection;

[0044] When in use, the slings are tied together and a cloth strip of a different color from the base fabric is added to distinguish them, improving their recognition during use;

[0045] The lower end of the base fabric body 1 is integrally cut and sealed by the stitches 6 to form the bag bottom 5. The stitches at the bag bottom are in direct contact with the material, so they are single-rolled or double-rolled before being sewn to ensure the sealing and seam strength when the bag bottom is connected;

[0046] The hanging strap 3 is connected with the bag bottom 5 through the bag body 2.

[0047] Specifically, the bag body 2 is square after unfolding with the feeding port 4, which can fully improve the space utilization of the bulk bag during storage and transportation after filling with materials.

[0048] Specifically, the bag bottom 5 is in a V shape with two opposite sharp ends, and after filling with materials, it becomes a double-V-shaped square bottom, so that the bulk bag is not easy to tip over.

[0049] The production process of the M-fold bulk bag includes the following steps:

[0050] S1, silk making, the polypropylene particles are made into silk or sheet shape after stirring and melting through an extruder;

[0051] S2, circular weaving, the polypropylene silk or polypropylene tape is woven into a cylindrical base body by a circular weaving machine;

[0052] S3, coating the inner adhesive film, the inner adhesive film is coated on the inner wall of the base body by an inner adhesive film machine;

[0053] S4, M-fold forming, after the base body and the inner adhesive film are preheated and softened, the M-fold forming mechanism on the production line is used for forming and winding into a roll;

[0054] S5, hanging strap split and feeding port forming, the M-fold base roll is rotated, the free port is layered and hot press welded, and after welding, the welding surface is symmetrically cut to form the hanging strap split and the feeding port;

[0055] S6, printing, according to the production needs, the characters are printed on the outer surface of the bag body;

[0056] S7, hanging strap split butt joint, two hanging strap splits are connected into a closed hanging strap through a sewing thread;

[0057] S8, M-fold base lower end cutting, when the M-fold base reaches the length of a single bulk bag, the machine automatically cuts off the connection with the M-fold base roll;

[0058] S8, bag bottom plugging, the lower end M-shaped bending area of the base is plugged with a sewing thread;

[0059] S9, the free end of the M-fold base roll continues to repeat the steps S5-S8 to complete the production and processing of the bulk bag.

[0060] Specifically, the S5 step includes hot press welding of two V-shaped folds of the M-fold base in the same direction by a hot press welding machine, and cutting along the center line of the welding surface by a partially open circular cutting knife.

[0061] Specifically, the length of the blade of the partially opened circular cutting knife is equal to the length of the welding surface, and the length of the unopened part of the circular cutting knife is equal to the length of the bag body, which can realize continuous cutting in a pipeline.

[0062] Specifically, the steps S5-S8, unwinding, forming a lifting belt and a feeding port, slitting, printing, and blocking the bag bottom, are completed on one device, reducing the amount of manual use and the amount of use of a single sewing machine, realizing continuous production, and ensuring the uniform stability and production quality of the product, with extremely high flatness, standard structure size, no wrinkles, easy to roll or stack, reducing the error of automatic bag feeding during filling, and further reducing the floor area of the processing workshop.

[0063] As shown in Figures 5-7 After the seams of the M-folded bag are disassembled, the upper end opening is divided into a first lifting belt horizontal edge 101, a second lifting belt horizontal edge 102, a first lifting belt vertical edge 103, a second lifting belt vertical edge 104, a first feeding port vertical edge 105, and a second feeding port vertical edge 106, and the lower end opening is a bag bottom opening, which is an M-shaped opening with two opposite openings.

[0064] Before disassembly, the first lifting belt vertical edge 103 and the second lifting belt vertical edge 104 are hot-pressed and welded to form a lifting belt split body, and four first lifting belt vertical edges 103 are respectively hot-pressed and welded with four second lifting belt vertical edges 104 to form a square feeding port after being unfolded, and the first lifting belt horizontal edge 101 and the second lifting belt horizontal edge 102 between the two lifting belt split bodies are connected by a sewing line to form a lifting belt.

[0065] The two unfolded bottom edges of the bag bottom opening 107 are close to each other along the M-folded edges and are integrally connected by a sewing line.

[0066] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0067] The above-described embodiments are only descriptions of the preferred modes of the present application and do not limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements to the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. M-fold container bag, characterized by: The invention comprises a base fabric body (1), wherein the base fabric body (1) is woven into a cylindrical shape by drawing polypropylene, and the interior of the base fabric body (1) is coated with an inner mucosa; the base fabric body (1) and the inner mucosa are preheated and softened, and then formed by an M-folding forming machine, and the M-folded base fabric body (1) is wound into a roll; The peeling degree between the base fabric body (1) and the inner mucosa is not less than 1.2N / 15mm, and the longitudinal tensile strength is not less than 1800N / 5cm; The free end of the curled base fabric body (1) is subjected to layered hot-pressing welding to form a welding surface (7), and the welding surface (7) is symmetrically cut; The cutting area of ​​the two welding surfaces (7) forms a feed port (4), a sling split is formed between the welding surface (7) and the side wall of the base fabric body (1), and the two sling splits are connected to form a sling (3) using a stitching line (6); The lower end of the base fabric body (1) is integrally cut and sealed by the stitching (6) to form a bag bottom (5); The sling (3) is connected to the bag bottom (5) through the bag body (2).

2. The M-fold container bag according to claim 1, characterized in that: The bag body (2) and the feed opening (4) are square when unfolded.

3. The M-fold container bag according to claim 2, characterized in that: The bag bottom (5) is in a V-shape with two pointed ends facing each other.

4. A production process for an M-fold container bag, for producing the M-fold container bag according to claim 3, characterized in that: The steps include: S1, filament making, polypropylene granules are stirred and melted, and then formed into filaments or sheets through an extruder; S2, circular weaving, weaving polypropylene yarn or polypropylene tape into a cylindrical base fabric body through a circular loom; S3, coating the inner mucosa, coating the inner mucosa on the inner wall of the base fabric body by an inner mucosa machine; S4, M-fold forming: After the base fabric body and the inner mucosa are preheated and softened, they are formed by the M-fold forming mechanism on the production line and rolled into a roll; S5, the sling body and the feed port are formed, the free ends of the M-folded base fabric are layered and hot-pressed, and after welding, they are symmetrically cut on the welding surface to form the sling body and the feed port; S6. Printing: Print fonts on the outer surface of the bag according to production needs; S7, the sling parts are connected by stitching to form a closed sling; S8, the lower end of the M-fold base fabric is cut. When the M-fold base fabric reaches the preset length of the container bag, the machine automatically cuts off the connection with the M-fold base fabric roll; S8, bag bottom sealing, the lower end of the base fabric M-shaped bending area is sealed with stitches; S9, M-fold the free end of the base fabric roll and continue to repeat steps S5-S8 to complete the production and processing of the container bag.

5. The production process of M-folded container bags according to claim 4, characterized in that: The step S5 includes performing hot-press welding on the two V-shaped folds in the same direction of the M-fold base fabric respectively by a hot-press welding machine, and cutting along the center line of the welding surface by a partially sharpened circular cutting knife.

6. The production process of M-folded container bags according to claim 5, characterized in that: The length of the blade of the partially sharpened circular cutting knife is equal to the length of the welding surface, and the length of the unsharpened portion of the circular cutting knife is equal to the length of the bag body.

Images