M-shaped paper bag and processing method

Abstract

The present invention discloses an M-shaped paper bag, wherein the bag body is composed of a front part, a back part, a side part and a connecting part, and the front part and the back part are respectively provided with side indentation lines between the side part and the side edge of the front part and the side edge of the back part; the connecting part is located between the lower end of the side part, the lower end of the front part and the lower end of the back part, and the side part, the front part, the back part and the connecting part are an integrated structure. The paper bag of the present application is simple to process and bond, and the bonding operation of the paper bag can be completed after only three steps of folding, and the operation is simple and fast, and it is easy to produce automatically; at the same time, the bottom of the paper bag of the present application is an integrated structure with the front part and the back part, and the opening of the accordion M-shaped paper bag is large enough to store thicker items, and the integrated structure of the bottom of the express document is also strong and durable; at the same time, the bottom of the unfolded bag body forms an inner triangular reinforcement sheet through an X-shaped indentation line, which further enhances the stability of the bottom of the bag body.

Description

Technical Field

[0001] The invention relates to the field of packaging bags and packaging equipment, and in particular to an M-shaped paper bag and a processing method thereof. Background Art

[0002] As we all know, paper is a recyclable resource. The raw material for papermaking is mainly plant fiber. In addition to the three main components of cellulose, hemicellulose and lignin, there are other components with smaller contents, such as resin and ash. The commonly used plastic bags are made of polyethylene, and the raw material used is petroleum, which is already a scarce energy source. Compared with plastic bags, the raw material for paper bags is trees, which is a renewable resource. The characteristics of paper bags themselves being degradable and recyclable are naturally labeled green.

[0003] Moreover, paper bags have become an indispensable item in people’s daily life and work. For example: (1) With the rise of e-commerce at home and abroad, the express delivery industry is growing, and the demand for packaging bags is increasing; (2) packaging bags used when shopping in shopping malls; (3) a packaging bag is used when buying food or other items; (4) archive packaging used by individuals, educational institutions, medical institutions, companies or government departments to store documents and materials, etc. There are various types of paper bags.

[0004] For example, the "Packaging Bag" disclosed in patent ZL201920558149.X, the traditional M-shaped bag body needs to be bonded to the bottom and one side, the bottom is not strong enough, and the problem of items falling out from the bottom often occurs. In addition, the traditional accordion M-shaped packaging bag involves the combined bonding of multiple surfaces, which is difficult to automate and has high equipment costs. For example, the "Multifunctional Document Envelope" disclosed in patent 201920210477.0, the traditional express bag adopts the bonding and fixing method of the two sides. Although the bottom is an integrated structure, the bag body has a small opening and cannot accommodate thicker documents.

[0005] At present, the bags made of plastic on the market are called plastic bags, and the bags made of wood pulp paper are called paper bags. The production efficiency of plastic bags is low, and plastic pollutes the environment and cannot be recycled. Both China and foreign countries have issued plastic ban orders, the purpose of which is to limit the use of plastic bags. Paper bags made of wood pulp can be recycled, have the advantages of high production efficiency and low cost. At present, the paper bags on the market include flat paper bags (such as express bags) and accordion M-edged paper bags. The flat paper bags have a small opening, which makes it difficult to put items, and the bag opening is narrow and cannot hold too many items, resulting in increased packaging costs and low work efficiency. The accordion M-edged paper bags have a small opening. The accordion M-shaped paper bag machine has many advantages, such as a large opening, which makes it easy to put things in, and a large space for more items to be placed inside, thereby reducing packaging costs and improving packaging efficiency. However, the existing accordion M-shaped paper bag machines on the market have many disadvantages: (1) The overall appearance of the machine is large and takes up too much space, resulting in high rental costs; (2) The operation is very complicated, resulting in low production efficiency; (3) The machine is very expensive and many factories cannot afford it; (4) The power consumption is high; (5) The machine is single, one is only for thin paper or the other is only for thick paper, and it cannot be used for both thick and thin paper. The above reasons lead to high overall production costs and low efficiency of paper bags. Summary of the invention

[0006] In view of the above problems, the present invention aims to provide an M-shaped paper bag which is easy to process and has a stable structure, and a processing method thereof.

[0007] To achieve the technical purpose, the present invention provides an M-shaped paper bag, comprising a bag body, wherein the bag body is composed of a front portion, a back portion, a side portion and a connecting portion, wherein the front portion and the back portion are both provided with side portions, and side edge indentation lines are provided between the side portions and the side edges of the front portion and the side edges of the back portion;

[0008] The connecting portion is located between the lower ends of the side portion, the front portion and the back portion, and the side portion, the front portion, the back portion and the connecting portion are an integrated structure;

[0009] The connecting portion is provided with a central indentation line and a bottom indentation line, wherein the central indentation line is located at one-half of the connecting portion, and the bottom indentation line is the connection between the connecting portion and the lower ends of the side portion, the front portion, and the back portion;

[0010] The side portion connected to the front portion is also provided with an adhesive portion, and an adhesive indentation line is provided between the adhesive portion and the side portion;

[0011] The bonding portion is bonded and fixed correspondingly to the side portion connected to the back portion.

[0012] Preferably, the inner side of the bonding portion is bonded and fixed to the outer side of the side portion of the back portion accordingly, and after bonding, the bonding portion is located on the outer side of the bag body.

[0013] Preferably, a bag tongue is provided at the top of the front part or the back part, two or more disposable sealing strips arranged in parallel are bonded to the bag tongue, and an easy-tear strip is provided between the disposable sealing strips;

[0014] Secondary sealing indentation lines are also provided on the front and back parts.

[0015] Preferably, both sides of the connecting portion are also correspondingly connected to the bonding portion, and the length of the bonding portion is greater than the length of the side portion;

[0016] X-shaped indentation lines are also arranged on both sides of the connection portion adjacent to the bonding portion.

[0017] An automatic paper bag machine also includes a frame, a paper storage rack for storing cut and pressed paper bodies is arranged on one side of the frame, a suction cup paper feeding mechanism is arranged above the paper storage rack, a first deviation correction and transmission mechanism is arranged on one side of the paper feeding mechanism, the paper feeding mechanism can absorb and transport the paper body to the first deviation correction and transmission mechanism, and the tail end of the first deviation correction and transmission mechanism is sequentially connected to an M-edge folding mechanism, a gluing mechanism and a bag forming mechanism;

[0018] The bag forming mechanism is also connected to a second deviation-correcting transmission mechanism, and the tail end of the second deviation-correcting transmission mechanism is sequentially connected to a sealing tape pasting mechanism and a collecting and counting mechanism.

[0019] Preferably, the M-edge folding mechanism comprises a telescopic pressing plate and a first flip plate, and sliding plates and a second flip plate are further provided on both sides of the telescopic pressing plate, and the first flip plate is located on both sides of the telescopic pressing plate;

[0020] The retractable pressing plate presses the paper downwards, and at the same time, the sliding pieces extend from both sides of the retractable pressing plate to the side indentation line, and the first flip plate pushes the side part and the bonding part to rotate upwards along the side indentation line. After the first flip plate rotates 180°, the side part is bent, and the bonding part contacts the second flip plate, and the second flip plate is started to push the bonding part to rotate downwards, that is, the reverse bending of the bonding part is completed, and at this time, the inner side of the bonding part faces upwards;

[0021] The sliding piece retracts inwards to reset, the second flip plate rotates upward to avoid and make way, the first flip plate rotates downward to reset, and then the second flip plate rotates downward again to flatten the bonding part and then reset, and finally the telescopic pressing plate rises to reset.

[0022] A paper bag processing method, according to the M-type paper bag, the specific processing steps are as follows:

[0023] The first step is cutting, cutting the paper roll and pressing corresponding indentation lines in the designated area to obtain a paper body with indentation lines;

[0024] The second step is folding the edge. The paper body is grasped or adsorbed by the paper feeding mechanism and transferred to the first deflection correction and transmission mechanism. The position of the paper body is adjusted by the first deflection correction and transmission mechanism. The side part is firstly bent inward, and then the bonding part is bent outward, with the inner side of the bonding part facing upward.

[0025] The third step is to apply glue by applying glue on the inner side of the bonding part facing upwards through the glue applying mechanism;

[0026] The fourth step is forming, in which the inner side of the bonding part and the outer side of the side part of the back part are bonded and fixed together by a bag forming mechanism, so as to obtain an M-shaped bag body.

[0027] Preferably, X-shaped indentation lines are provided on both sides of the connecting portion adjacent to the bonding portion;

[0028] When in the folded state, the side parts are folded and stored between the front part and the back part; when the bag opening is unfolded, the cross-section of the bag body is M-shaped, the side parts are gradually unfolded and squeeze the connecting part, and inner triangular reinforcement plates are formed on both sides of the connecting part through X-shaped indentation lines, and the inner triangular reinforcement plates are located at the bottom of the bag body.

[0029] The beneficial effects of the present invention are as follows: the paper bag of the present application is simple to process and bond, and the bonding operation of the paper bag can be completed through only three steps of folding. The operation is simple and quick, and it is easy to automate production. At the same time, the bottom of the paper bag of the present application is an integrated structure with the front and back parts, and the opening of the accordion M-shaped paper bag is large enough to store thicker items, while the integrated structure of the bottom of the express document is sturdy and durable. At the same time, the bottom of the unfolded bag body forms an inner triangular reinforcement sheet through an X-shaped indentation line, which further enhances the stability of the bottom of the bag body. The paper bag machine of the present application has a simple structure, does not require a complex manipulator, has a low production cost, and can meet the needs of making paper bags of various thicknesses of paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a diagram of the expanded state of the present invention;

[0031] Figure 2 A perspective view of the formal surface of the present invention;

[0032] Figure 3 A perspective view of the rear surface of the present invention;

[0033] Figure 4 It is the production flow chart of the present invention;

[0034] Figure 5 It is a structural schematic diagram of the automatic paper bag machine of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the sealing strip pasting mechanism of the automatic paper bag machine of the present invention;

[0036] Figure 7It is a schematic diagram of the structure of the paper bag of the present invention;

[0037] Figure 8 A top view of the paper bag of the present invention;

[0038] Fig. 9 It is a structural schematic diagram of the M-edge folding mechanism of the automatic paper bag machine of the present invention. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1-9 As shown, the specific embodiment of the present invention is an M-shaped paper bag, comprising a bag body 10, the bag body 10 is composed of a front part 1, a back part 2, a side part 3 and a connecting part 4, the front part 1 and the back part 2 are both provided with side parts 3, and side edge indentation lines 5 are provided between the side parts 3 and the side edges of the front part 1 and the side edges of the back part 2;

[0041] The connecting portion 4 is located between the lower end of the side portion 3, the lower end of the front portion 1 and the lower end of the back portion 2 (the lower end here refers to Figure 2 The side portion 3, the front portion 1, the back portion 2 and the connecting portion 4 are an integrated structure, that is, a whole sheet of paper, and the above structures do not need to be bonded;

[0042] The connecting portion 4 is provided with a central indentation line 6 and a bottom indentation line 7. The central indentation line 6 is located at one-half of the connecting portion 4. The bottom indentation line 7 is the connection between the connecting portion 4 and the lower end of the side portion 3, the lower end of the front portion 1, and the lower end of the back portion 2.

[0043] The side portion 3 connected to the front portion 1 is further provided with an adhesive portion 8, and an adhesive indentation line 9 is provided between the adhesive portion 8 and the side portion 3;

[0044] The bonding portion 8 is bonded and fixed to the side surface portion 3 connected to the back surface portion 2 .

[0045] Traditional M-shaped paper bags (such as archive bags and shopping bags) are all glued at the bottom. When in use, the bottom is subjected to greater force. If the bottom is not firmly glued, it is very easy to break. In addition, the processing is very troublesome. There are many places that need to be folded. The bottom and the side need to be glued, which generally requires manual gluing. There are also equipment that can automatically produce archive bags, but the structure is complex and generally costs more than 100,000 yuan per unit, with high procurement and maintenance costs. The M-shaped paper bag of the present application has an integrated structure at the bottom, which is strong and durable enough. At the same time, it only requires one folding operation, one gluing operation, and one gluing operation. The processing difficulty is greatly reduced, the production cost is lower, and the yield rate is higher.

[0046] In order to obtain a bag body with a more stable structure and beautiful and practical appearance, the inner side of the bonding portion 8 is bonded and fixed to the outer side of the side portion 3 of the back portion 2. After bonding, the bonding portion 8 is located on the outside of the bag body 10. The inner side here refers to the part located on the inner side of the bag body after folding and bonding, and the outer side refers to the part located on the outside of the bag body; put it Figure 1 In the unfolded state, the part of the paper facing upward is the inner side, and the part of the paper facing downward is the outer side.

[0047] If the outer side of the adhesive part is correspondingly bonded and fixed to the inner side of the side part of the back part, after bonding, the adhesive part is located inside the bag body. In this way, a paper bag can also be obtained, but the side parts of this paper bag protrude from both sides, and the bottom is relatively thin. After the bag mouth is opened, protruding outer triangles are formed on both sides of the bottom, which is not beautiful and practical.

[0048] In order to enable the bag to be recycled for multiple times, a bag tongue 11 is provided at the top of the front portion 1 or the back portion 2, and two or more disposable sealing strips 12 arranged in parallel are bonded to the bag tongue 11, and an easy-tear strip 13 is provided between the disposable sealing strips 12;

[0049] The front part 1 and the back part 2 are also provided with secondary sealing indentation lines 14. After the bag is sealed with the adhesive strip for the first time, the bag body can be opened from the easy-tear strip. If the item is light, the new disposable sealing adhesive strip can be directly torn off to seal the bag against the top. If the item is heavy, the bag body can be bent along the secondary sealing indentation line, and the new disposable sealing adhesive strip can be sealed against the middle of the bag body.

[0050] In order to better bond the side parts and facilitate the bag to unfold, the two sides of the connecting part 4 are also connected to the bonding part 8, and the length of the bonding part 8 is greater than the length of the side part 3; in this way, the bonding area is larger, avoiding the side part near the bottom of the bag body and the bonding part from being loosely bonded.

[0051] X-shaped indentation lines 15 are also provided on both sides of the connection part 4 adjacent to the bonding part 3. The X-shaped indentation lines are conducive to the bag body to be unfolded, and an inner triangular reinforcement sheet is formed inside the bottom of the bag body after unfolding, so that the two sides of the bottom of the bag body are stronger and it is not easy to pierce from the two sides of the bottom.

[0052] An automatic paper bag machine also includes a frame 101, a paper storage rack 103 for storing cut and pressed paper 105 is arranged on one side of the frame 101, a suction cup paper feeding mechanism 102 is arranged above the paper storage rack 103, a first deviation correction and transmission mechanism 104 is arranged on one side of the paper feeding mechanism 102, the paper feeding mechanism 102 can absorb and transport the paper 105 to the first deviation correction and transmission mechanism 104, when the paper passes through the first deviation correction and transmission mechanism, its side wall will squeeze the paper so that the paper automatically completes alignment, and the tail end of the first deviation correction and transmission mechanism 104 is sequentially connected with a folding M edge mechanism 106, a gluing mechanism 107 and a bag forming mechanism 108. The gluing mechanism can accurately apply glue on the bonding part; the bag forming mechanism can fold the paper in half and press it tightly, and bond the bonding part with the corresponding side part to form a complete bag body, at which time the bag body is in a compressed flat state, and when in use, only items need to be stuffed in, and the squeezing connection part will automatically unfold.

[0053] The bag forming mechanism 108 is also connected to the second deviation correcting transmission mechanism 109, and the tail end of the second deviation correcting transmission mechanism 109 is sequentially connected to a sealing strip pasting mechanism 110 and a collecting and counting mechanism 111. The sealing strip pasting mechanism is responsible for pasting a disposable sealing strip, generally two disposable sealing strips.

[0054] In order to efficiently and automatically complete the folding operation of the edge of the M-shaped paper bag, the M-folding mechanism 106 includes a telescopic pressing plate 1061 and a first flip plate 1062. Sliding plates 1063 and second flip plates 1064 are also provided on both sides of the telescopic pressing plate 1061. The first flip plate 1062 is located on both sides of the telescopic pressing plate 1061.

[0055] The retractable pressing plate 1061 moves downward through the oil cylinder or the air cylinder to press the paper body 105, and at the same time, the sliding pieces 1063 extend from both sides of the retractable pressing plate 1061 to the side indentation line 5, and the first flip plate 1062 pushes the side portion 3 and the bonding portion 8 to rotate upward along the side indentation line 5. After the first flip plate 1062 rotates 180°, the side portion 3 is bent, and the bonding portion 8 contacts the second flip plate 1064, and the second flip plate 1064 is started to push the bonding portion 8 to rotate downward, that is, the reverse bending of the bonding portion 8 along the bonding indentation line 9 is completed, and at this time, the inner side of the bonding portion 8 faces upward;

[0056] The sliding piece 1063 retracts inward to reset, the second flip plate 1064 rotates upward to avoid the first flip plate 1062 and make way for it, the first flip plate 1062 rotates downward to reset, and then the second flip plate 1064 rotates downward again to flatten the bonding portion 8 and then reset, and finally the telescopic pressing plate 1061 rises and resets.

[0057] A processing method for an M-shaped paper bag, the specific steps are as follows:

[0058] The first step is cutting, cutting the paper roll, the discarded part of the paper body is very small, and pressing the corresponding indentation line in the designated area to obtain the paper body with indentation line;

[0059] The second step is folding the edge. The paper body is grasped or adsorbed by the paper feeding mechanism and transferred to the first deflection correction and transmission mechanism. The position of the paper body is adjusted by the first deflection correction and transmission mechanism. The side part is firstly bent inward by the folding mechanism, and then the bonding part is bent outward, with the inner side of the bonding part facing upward.

[0060] The third step is to apply glue by applying glue on the inner side of the bonding part facing upwards through the glue applying mechanism;

[0061] The fourth step is forming, by bonding and fixing the inner side of the bonding part and the outer side of the side part of the back part together through the bag forming mechanism, that is, obtaining an M-shaped bag body in a folded, compressed and flattened state. The inner side of the bonding part in steps 2-4 means: after the bag body is unfolded, this surface faces the inner direction of the bag body. The "outer side part" in step 4 means: after the bag body is unfolded, this surface faces the outer direction of the bag body.

[0062] In order to better unfold and obtain a stable bag body, X-shaped indentation lines are also provided on both sides of the connection part adjacent to the bonding part; when folded, the side parts are folded and stored between the front part and the back part; when the bag mouth is unfolded, the cross section of the bag body is M-shaped, the side parts are gradually unfolded and squeeze the connection part, and the two sides of the connection part form inner triangular reinforcement pieces through the X-shaped indentation lines. The inner triangular reinforcement pieces are located at the bottom of the bag body to enhance the stability of the bottom. The inner triangular reinforcement pieces can increase the thickness of the two sides of the bottom, which can effectively avoid the damage of the bottom corners when thicker or heavier items are loaded, and further improve the stability.

[0063] The paper bag of the present application is simple to process and bond, and the bonding operation of the paper bag can be completed through only three steps of folding. The operation is simple and fast, and it is easy to produce automatically. At the same time, the bottom of the paper bag of the present application is an integrated structure with the front and back parts. The opening of the accordion M-shaped paper bag is large and can store thicker items. At the same time, the integrated structure of the bottom of the express document is strong and durable. At the same time, the bottom of the unfolded bag body forms an inner triangular reinforcement plate through an X-shaped indentation line, which further enhances the stability of the bottom of the bag body. The paper bag machine of the present application has a simple structure, does not require a complex manipulator, has a low production cost, and can meet the needs of making paper bags with various thicknesses of paper.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. An automatic paper bag machine, characterized in that: The M-type paper bag comprises a bag body, the bag body is composed of a front part, a back part, a side part and a connecting part, the front part and the back part are respectively provided with side parts on both sides, and side edge indentation lines are provided between the side parts and the side edges of the front part and the side edges of the back part; the connecting part is located between the lower end of the side part, the lower end of the front part and the lower end of the back part, the side part, the front part, the back part and the connecting part are an integrated structure, a central indentation line and a bottom edge indentation line are provided on the connecting part, the central indentation line is located at one-half of the connecting part, and the bottom edge indentation line is the connection between the connecting part and the lower end of the side part, the lower end of the front part and the lower end of the back part; an adhesive part is also provided on the side part connected to the front part, and an adhesive indentation line is provided between the adhesive part and the side part; the adhesive part is correspondingly adhesively fixed to the side part connected to the back part; The inner side of the adhesive portion is correspondingly bonded and fixed to the outer side of the side portion of the back portion, and after bonding, the adhesive portion is located on the outside of the bag body; a bag tongue portion is provided at the top of the front portion or the back portion, and two or more disposable sealing strips arranged in parallel are bonded to the bag tongue portion, and an easy-tear strip is provided between the disposable sealing strips; secondary sealing indentation lines are also provided on the front portion and the back portion; both sides of the connecting portion are also correspondingly connected to the adhesive portion, and the length of the adhesive portion is greater than the length of the side portion; X-shaped indentation lines are also provided at the two sides of the connecting portion adjacent to the adhesive portion; The automatic paper bag machine also includes a frame, a paper storage rack for storing cut and pressed paper bodies is arranged on one side of the frame, a suction cup paper feeding mechanism is arranged above the paper storage rack, a first deviation correction and transmission mechanism is arranged on one side of the paper feeding mechanism, the paper feeding mechanism can absorb and transport the paper body to the first deviation correction and transmission mechanism, and the tail end of the first deviation correction and transmission mechanism is sequentially connected to the M-edge folding mechanism, the gluing mechanism and the bag forming mechanism; The bag forming mechanism is also connected to a second deviation-correcting transmission mechanism, and the tail end of the second deviation-correcting transmission mechanism is sequentially connected to a sealing tape pasting mechanism and a collecting and counting mechanism; The M-edge folding mechanism includes a telescopic pressing plate and a first flip plate. Sliding plates and second flip plates are also provided on both sides of the telescopic pressing plate. The first flip plates are located on both sides of the telescopic pressing plate. The retractable pressing plate presses the paper downwards, and at the same time, the sliding pieces extend from both sides of the retractable pressing plate to the side indentation line, and the first flip plate pushes the side part and the bonding part to rotate upwards along the side indentation line. After the first flip plate rotates 180°, the side part is bent, and the bonding part contacts the second flip plate, and the second flip plate is started to push the bonding part to rotate downwards, that is, the reverse bending of the bonding part is completed, and at this time, the inner side of the bonding part faces upwards; The sliding piece retracts inwards to reset, the second flip plate rotates upward to avoid and make way, the first flip plate rotates downward to reset, and then the second flip plate rotates downward again to flatten the bonding part and then reset, and finally the telescopic pressing plate rises to reset.

2. A paper bag processing method, characterized in that: According to the automatic paper bag machine of claim 1, the specific processing steps are as follows: The first step is cutting, cutting the paper roll and pressing corresponding indentation lines in the designated area to obtain a paper body with indentation lines; The second step is folding the edge. The paper body is grasped or adsorbed by the paper feeding mechanism and transferred to the first deflection correction and transmission mechanism. The position of the paper body is adjusted by the first deflection correction and transmission mechanism. The side part is firstly bent inward, and then the bonding part is bent outward, with the inner side of the bonding part facing upward. The third step is to apply glue by applying glue on the inner side of the bonding part facing upwards through the glue applying mechanism; The fourth step is forming, in which the inner side of the bonding part and the outer side of the side part of the back part are bonded and fixed together by a bag forming mechanism, so as to obtain an M-shaped bag body.

3. The paper bag processing method according to claim 2, characterized in that: X-shaped indentation lines are also provided at both sides of the connection portion adjacent to the bonding portion; When in the folded state, the side parts are folded and stored between the front part and the back part; when the bag opening is unfolded, the cross-section of the bag is M-shaped, the side parts are gradually unfolded and squeeze the connecting part, and inner triangular reinforcement plates are formed on both sides of the connecting part through X-shaped indentation lines, and the inner triangular reinforcement plates are located at the bottom of the bag body.

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