An environmentally friendly plastic bag with an anti-slip handle structure and its one-piece molding method

Abstract

This invention relates to the field of plastic bags, and more particularly to an environmentally friendly plastic bag with an anti-slip handle structure and its one-piece molding method. The technical problem this invention aims to solve is to provide an environmentally friendly plastic bag with an anti-slip handle structure and its one-piece molding method that can be integrally molded, ensuring continuous and efficient manufacturing processes, improving product performance, and meeting the needs of modern production. An environmentally friendly plastic bag with an anti-slip handle structure includes a bag body, handles integrally connected to the bag body on both sides of the bag body's opening; M-fold structures are provided on both sides of the bag body, with inward folds at the bottom of the M-folds; a first sealing edge is provided on the lower side of the bag body away from the handles, and a second sealing edge is provided on the upper side of the handles away from the bag body; a handle hole is provided on the handle, and a convex piece integrally connected to the handle is folded inside the handle hole. This invention achieves the effect of integral molding, ensuring continuous and efficient manufacturing processes, improving product performance, and meeting the needs of modern production.

Description

Technical Field

[0001] This invention relates to the field of plastic bags, and more particularly to an environmentally friendly plastic bag with an anti-slip handle structure and its one-piece molding method. Background Technology

[0002] Plastic bags are widely used in social production and daily life as a low-cost and convenient packaging container; among them, plastic bags with handles are favored because they are easy to carry; however, traditional plastic bags with handles have significant defects in terms of grip comfort and anti-slip performance.

[0003] To improve the user experience, existing technologies typically employ two improvement paths: first, to prevent slippage, anti-slip textures are embossed onto the outer surface of the handle through subsequent processes; second, to address the issue of handles digging into the hand, an additional layer of material is glued or laminated inside the handle hole. While these methods can improve the anti-slip effect or wearing comfort to some extent, this non-integrated solution leads to additional processing steps, disrupting the continuous production line from blown film to finished bag, resulting in a complex and cumbersome production process, severely restricting production efficiency and increasing manufacturing costs. Furthermore, the practice of gluing or laminating heterogeneous materials increases the variety of materials, making it difficult to recycle the plastic bag as a whole, thus violating the original intention of environmental protection. Therefore, there is an urgent need to develop an environmentally friendly plastic bag with an anti-slip handle structure that can be integrally molded, ensuring a continuous and efficient manufacturing process, improving product performance, and meeting the needs of modern production, along with its integral molding method. Summary of the Invention

[0004] In order to overcome the shortcomings of existing plastic bags with anti-slip structures, which have complex and cumbersome production processes, severely restricting production efficiency and increasing manufacturing costs, the present invention aims to provide an environmentally friendly plastic bag with an anti-slip handle structure and its one-piece molding method that can be integrally molded, ensuring continuous and efficient manufacturing process, improving product performance, and meeting the needs of modern production.

[0005] This invention is achieved through the following specific technical means:

[0006] A method for integrally molding an environmentally friendly plastic bag with an anti-slip handle structure includes the following steps:

[0007] Step 1, film blowing: Molten plastic is extruded through an annular die to form a tubular film bubble, and compressed air is blown into the film bubble to make it expand and form a thin-walled cylindrical film;

[0008] Step 2, Folding and Rolling: The cooled tubular membrane bubble is rolled up into a flat film strip with M-folds on both sides;

[0009] Step 3, punching: Using a punching device, convex through-slots are punched at equal intervals on the film strip to initially form a handle structure; the side of the convex through-slot is located outside the inner fold line of the M-fold on both sides of the film strip, thus forming a handle hole structure; and a protruding tab is made on the handle part to be integrally connected with the handle.

[0010] Step 4, Anti-slip texture imprinting: Anti-slip texture is imprinted on the outer surface of both sides of the through groove punched in the film strip and on the inner fold surface of the M-fold; at the same time, texture is also imprinted on the surface of the convex sheet;

[0011] Step 5, hot sealing: The first and second sealing edges are hot-pressed on both sides of the short side of the convex groove punched on the film strip using a hot sealing machine;

[0012] Step 6, Cutting: Cut along the short side of the punched convex groove on the film strip with a cutting knife to form a single plastic bag with a bag body and a handle;

[0013] Step 7, Fold the corner: Fold the convex piece formed by the punched convex groove at the handle of the plastic bag into the handle hole;

[0014] Step seven is accomplished by a folding device, which includes a spreading component for spreading the handle hole; and a folding component for folding the protrusion into the handle hole after the handle hole is spread open.

[0015] The spreading assembly has two sets, which are respectively set on the outside of the two handles; including a mounting plate, a first cylinder is set on the side of the mounting plate away from the handle, and the extension rod of the first cylinder is connected to the mounting plate; two second cylinders are fixedly connected to the side of the mounting plate near the handle and are parallel to the mounting plate and arranged opposite to each other, and pneumatic grippers for clamping the two sides of the handle hole are fixedly connected to the ends of the extension rods of the two second cylinders.

[0016] The angle-folding assembly includes a pressure block and a swing gripper respectively disposed on both sides of a handle; the pressure block is disposed on the outside of the handle, and the swing gripper is disposed on the inside of the handle, with the pressing end of the pressure block and the clamping end of the swing gripper inclined toward the handle and the protrusion on the handle, and the pressure block and the swing gripper are disposed in a straight line; a third cylinder is disposed on the end of the pressure block away from the handle, and the pressure block is fixedly connected to the end of the telescopic rod of the third cylinder; a fourth cylinder is disposed on the side of the swing gripper away from the handle, and the swing gripper is fixedly connected to the end of the telescopic rod of the fourth cylinder through a connecting seat.

[0017] Furthermore, step two is completed by a folding assembly, which includes a herringbone plate for gradually shrinking the tubular membrane bubble into a planar film. A forming block is symmetrically arranged at the openings on both sides of the herringbone plate to make M-folds on both sides when the tubular membrane bubble shrinks. One side of the forming block is a triangle with a wider base and a narrower top, and the apex of the triangle is inclined towards the inside of the herringbone plate.

[0018] Furthermore, step four is completed by an imprinting device, which includes an upper imprinting assembly disposed above both sides of the film belt, a lower imprinting assembly disposed below both sides of the film belt, and a central imprinting assembly disposed within the M-folds of the film belt for opening up both sides of the film belt. The upper imprinting assembly is driven by a cylinder telescopic rod and includes an upper moving plate, an upper heating plate fixed to its lower side, and an upper imprinting plate disposed below the upper heating plate. The bottom surface of the upper imprinting plate is provided with imprinting patterns. The lower imprinting assembly is driven by a cylinder telescopic rod and includes a lower moving plate, a lower heating plate fixed to its upper side, and a lower imprinting plate disposed above the lower heating plate. The top surface of the lower imprinting plate is provided with imprinting patterns. The central imprinting assembly includes a central heating plate and a central imprinting plate fixed to its upper and lower surfaces. The outer surfaces of both central imprinting plates are provided with imprinting patterns.

[0019] Furthermore, the pressing block is an electrically heated block, which can heat and soften the inner surfaces of the tabs and the handle when the handle and the tabs are squeezed, so that the tabs are bonded to the inner surface of the handle after folding.

[0020] An environmentally friendly plastic bag with an anti-slip handle structure is characterized by comprising a bag body, handles integrally connected to the bag body on both sides of the bag body opening; M-fold structures are provided on both sides of the bag body, with the bottom of the M-folds having an inward fold line; a first sealing edge is provided on the lower side of the bag body away from the handles, and a second sealing edge is provided on the upper side of the handles away from the bag body; a handle hole is provided on the handle, and a protrusion integrally connected to the handle is folded inside the handle hole; anti-slip textures are provided on the outer surface of the handle, the inner surface of the handle hole, and the surface of the protrusion.

[0021] Furthermore, the anti-slip texture is formed by hot pressing, and the raised piece is fixed to the inner surface of the handle by hot pressing.

[0022] Furthermore, the anti-slip texture has a raised or recessed pattern.

[0023] Furthermore, the inner side of the connection point between the lower end of the two handles and the bag body is provided with an arc-shaped angle to prevent stress concentration and improve connection strength.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention achieves integrated molding, ensuring a continuous and efficient manufacturing process, improving product performance while meeting the needs of modern production. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the molding process of the present invention.

[0027] Figure 2 This is a schematic diagram of the main structure of the plastic bag of the present invention.

[0028] Figure 3 This is a schematic diagram of the three-dimensional structure of the plastic bag of the present invention.

[0029] Figure 4 This is a schematic diagram of the folding component structure of the present invention.

[0030] Figure 5 This is a schematic diagram of the imprinting device of the present invention.

[0031] Figure 6 This is a schematic diagram of the angle bending process of the present invention.

[0032] Figure 7 This is a schematic diagram of the structure of the expansion component of the present invention.

[0033] Figure 8 This is a schematic diagram of the first folding component structure of the present invention.

[0034] Figure 9 This is a schematic diagram of the second type of folding component structure of the present invention.

[0035] The labels in the attached diagram are as follows: 11-bag body, 12-handle, 13-M-fold, 14-inner fold line, 15-through groove, 16-first edge seal, 17-second edge seal, 18-handle hole, 19-protrusion, 2-folding assembly, 21-herringbone plate, 22-forming block, 3-imprinting device, 31-upper moving plate, 32-upper heating plate, 33-upper imprinting plate, 34-lower moving plate, 35-lower heating plate, 36-lower imprinting plate, 37-center heating plate, 38-center imprinting plate, 4-corner folding device, 41-mounting plate, 42-first cylinder, 43-second cylinder, 44-pneumatic gripper, 45-pressing block, 46-swinging gripper, 47-third cylinder, 48-fixed base, 49-fourth cylinder. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings: Example

[0037] A method for integrally molding an environmentally friendly plastic bag with an anti-slip handle structure includes the following steps:

[0038] Step 1, film blowing: Molten plastic is extruded through an annular die to form a tubular film bubble, and compressed air is blown into the film bubble to make it expand and form a thin-walled cylindrical film;

[0039] Step 2, Folding and Rolling: The cooled cylindrical membrane bubble is rolled up into a flat film strip with M-folds 13 on both sides;

[0040] Step 3, punching: The punching device punches out convex through grooves 15 at equal intervals on the film strip to initially form the handle 12 structure; the side of the convex through groove 15 is located outside the inner fold line 14 of the M fold 13 on both sides of the film strip, thus forming the handle hole 18 structure; and the handle 12 part has a protruding tab 19 integrally connected with the handle 12.

[0041] Step 4, Anti-slip texture imprinting: Anti-slip texture is imprinted on the outer surface of both sides of the through groove 15 punched in the film strip and on the inner fold surface of the M fold 13; at the same time, texture is also imprinted on the surface of the convex sheet 19.

[0042] Step 5, hot sealing: Using a hot sealing machine, two first sealing edges 16 and second sealing edges 17 are hot-pressed on both sides of the short side of the convex groove 15 punched in the film strip.

[0043] Step 6, Cutting: Cut along the short side of the punched convex groove 15 on the film strip with a cutting knife to form a single plastic bag with a bag body 11 and a handle 12.

[0044] Step 7, Folding the corner: Fold the protrusions 19 formed by the punched convex grooves 15 at the handle 12 of the plastic bag into the handle hole 18;

[0045] Step seven is completed by the angle-folding device 4, which includes an opening component for opening the handle hole 18; and an angle-folding component for folding the protrusion 19 into the handle hole 18 after the handle hole 18 is opened.

[0046] The opening assembly has two sets, which are respectively set on the outside of the two handles 12; including a mounting plate 41, a first cylinder 42 is set on the side of the mounting plate 41 away from the handle 12, and the telescopic rod of the first cylinder 42 is connected to the mounting plate 41; two second cylinders 43 are fixedly connected to the side of the mounting plate 41 near the handle 12, which are parallel to the mounting plate 41 and arranged opposite to each other, and the ends of the telescopic rods of the two second cylinders 43 are fixedly connected to pneumatic grippers 44 for clamping the two sides of the handle hole 18;

[0047] The angle-folding assembly includes a pressure block 45 and a swing gripper 46 respectively disposed on both sides of a handle 12; the pressure block 45 is disposed on the outside of the handle 12, and the swing gripper 46 is disposed on the inside of the handle 12. The pressing end of the pressure block 45 and the clamping end of the swing gripper 46 are inclined toward the handle 12 and the protrusion 19 on the handle 12, and the pressure block 45 and the swing gripper 46 are disposed in a straight line; a third cylinder 47 is disposed at the end of the pressure block 45 away from the handle 12, and the pressure block 45 is fixedly connected to the end of the telescopic rod of the third cylinder 47; a fourth cylinder 49 is disposed on the side of the swing gripper 46 away from the handle 12, and the swing gripper 46 is fixedly connected to the end of the telescopic rod of the fourth cylinder 49 through a connecting seat.

[0048] An environmentally friendly plastic bag with an anti-slip handle 12 structure includes a bag body 11, handles 12 integrally connected to the bag body 11 on both sides of the opening end of the bag body 11; the bag body 11 has M-fold 13 structures on both sides, with an inward fold line 14 at the bottom of the M-fold 13; a first sealing edge 16 is provided on the lower side of the bag body 11 away from the handle 12, and a second sealing edge 17 is provided on the upper side of the handle 12 away from the bag body 11; a handle hole 18 is provided on the handle 12, and a protrusion 19 integrally connected to the handle 12 is folded inside the handle hole 18; the outer surface of the handle 12, the inner surface of the handle hole 18, and the surface of the protrusion 19 are all provided with anti-slip textures.

[0049] Working principle:

[0050] First, molten plastic is extruded into a tubular film bubble through a ring die using a blown film process, and compressed air is blown into the film bubble to expand it, forming a thin-walled cylindrical film. Then, the cooled cylindrical film bubble is folded together by a folding assembly 2 into a flat film strip with M-folds 13 on both sides, wherein the forming block 22 makes M-folds 13 on both sides of the film bubble as it gradually shrinks. Next, a punching device punches out convex through-slots 15 at equal intervals on the film strip, initially forming a handle 12 structure, and the side of the convex through-slot 15 is located outside the inner fold line 14 of the M-folds 13 on both sides of the film strip, thereby forming a handle hole 18 structure, and a protruding tab 19 integrally connected to the handle 12 protrudes from the handle 12 part.

[0051] Then, the film strip enters the embossing device 3. Through the coordinated action of the upper embossing component, the lower embossing component, and the central embossing component, anti-slip textures are embossed on the outer surfaces of both sides of the through groove 15 punched by the film strip, corresponding to the outer surface of the handle 12 of the bag body 11, and the inner fold surface of the M-fold 13, corresponding to the inner surface of the handle hole 18 of the bag body 11. At the same time, textures are also embossed on the surface of the convex sheet 19. After embossing, the film strip is heat-sealed by a hot-pressing edge-sealing machine to heat-press the first sealing edge 16 and the second sealing edge 17 on both sides of the short side of the convex through groove 15, forming the lower sealing edge on the previous plastic bag and the upper sealing edge on the next plastic bag. After that, the cutting blade cuts along the short side of the convex through groove 15 to form a single plastic bag.

[0052] Finally, the plastic bag enters the corner-folding device 4. The opening component of the corner-folding device 4 operates. First, the first cylinder 42 drives the mounting plate 41 to move inward, causing the gripping ends of the two pneumatic grippers 44 on the mounting plate 41 to extend into the handle hole 18. Then, the pneumatic grippers 44 clamp the pieces on both sides of the handle hole 18 of the bag body 11. Next, the second cylinder 43 operates, and the telescopic rod pulls the pneumatic grippers 44 to move to both sides. The pneumatic grippers 44 drive the pieces on both sides of the handle hole 18 of the bag body 11 to move to both sides, thereby opening the handle hole 18. Then, the corner-folding component is activated, and the third cylinder 47... Synchronously driven by the fourth cylinder 49, the inclined hot pressing block 45 and the swinging gripper 46 move towards each other, jointly squeezing the handle 12 and the protrusion 19, causing the protrusion 19 to bend at a certain angle along the connection with the handle 12 into the handle hole 18. During this process, the pressing block 45 heats and softens the contact surface. Then, the third cylinder 47 retracts, driving the pressing block 45 to retract, and the swinging gripper 46 starts to clamp the protrusion 19 and the handle 12, so that the protrusion 19 is pressed tightly against the inner surface of the handle 12. The heat-melting property of the plastic is used to bond and fix it, finally forming a flat and structurally sound handle hole 18.

[0053] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0054] Although this disclosure has been described in detail with reference to exemplary embodiments, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and changes may be made thereto without departing from the scope of this disclosure.

Claims

1. An integrated forming method of an environment-friendly plastic bag with an anti-skid handle structure, characterized in that, It comprises the following steps: Step one: blowing film; The molten plastic is extruded into a tubular film bubble through an annular die, and compressed air is blown into the film bubble to make it expand, forming a thin-walled cylindrical film; Step two, folding and winding: the cooled cylindrical film bubble is folded into a flat film strip with M folds (13) on both sides; Step three, punching: a punch device punches a convex-shaped through slot (15) on the film strip at equal intervals to preliminarily form a handle (12) structure; the side edges of the convex-shaped through slot (15) are located outside the inner fold lines (14) of the M folds (13) on both sides of the film strip, thereby forming a handle hole (18) structure; and the handle (12) part protrudes with a tab (19) integrally connected with the handle (12); Step four, anti-slip line embossing: emboss anti-slip lines on the outer surfaces of the punched through slot (15) on both sides of the film strip and the inner folding surface of the M fold (13); at the same time, the surface of the tab (19) is also embossed with lines; Step five, heat sealing: a heat sealing machine is used to heat seal a first sealing edge (16) and a second sealing edge (17) on both sides of the short edges of the convex-shaped through slot (15) punched on the film strip; Step six, cutting: a cutting knife cuts along the short edges of the convex-shaped through slot (15) punched on the film strip to form a single plastic bag with a bag body (11) and a handle (12); Step seven, corner folding: the tab (19) formed by punching the convex-shaped through slot (15) at the handle (12) of the plastic bag is folded into the handle hole (18); The step seven is completed by a corner folding device (4), and the corner folding device (4) comprises an opening assembly for opening the handle hole (18) and a corner folding assembly for folding the tab (19) into the handle hole (18) after the handle hole (18) is opened; The opening assembly is provided with two groups of opening assemblies arranged on the outer sides of the two handles (12); the opening assembly comprises a mounting plate (41), a first air cylinder (42) arranged on the side of the mounting plate (41) away from the handle (12), and the mounting plate (41) is connected with the first air cylinder (42) through the telescopic rod; two second air cylinders (43) are fixedly connected with the mounting plate (41) on the side close to the handle (12), and the two second air cylinders (43) are arranged in parallel to the mounting plate (41) and opposite to each other; the telescopic rod end of the two second air cylinders (43) is fixedly connected with a pneumatic clamping jaw (44) for clamping the two side pieces of the handle hole (18); The corner folding assembly comprises a pressing block (45) and a swing clamping jaw (46) arranged on both sides of a handle (12); the pressing block (45) is arranged on the outer side of the handle (12), and the swing clamping jaw (46) is arranged on the inner side of the handle (12); the pressing block (45) and the swing clamping jaw (46) are arranged on the same straight line, and the pressing block (45) and the swing clamping jaw (46) are inclined towards the handle (12) and the tab (19) on the handle (12); a third air cylinder (47) is arranged on the end of the pressing block (45) away from the handle (12), and the pressing block (45) is fixedly connected with the telescopic rod end of the third air cylinder (47); a fourth air cylinder (49) is arranged on the side of the swing clamping jaw (46) away from the handle (12), and the swing clamping jaw (46) is fixedly connected with the telescopic rod end of the fourth air cylinder (49) through a connecting seat. The step two is completed by folding assembly (2), the folding assembly (2) includes chevron (21) for gradually collecting tubular film bubble into plane film, and the forming block (22) for M-folding (13) on both sides of tubular film bubble is symmetrically arranged at both sides openings of chevron (21), one side of forming block (22) is triangular with bottom width and top narrow, and the top end of triangular is inclined towards the inner side of chevron (21); The step four is completed by stamping device (3), the stamping device (3) includes upper stamping assembly arranged above both sides of film strip, lower stamping assembly arranged below both sides of film strip, and center stamping assembly arranged in M-fold (13) of film strip for supporting M-fold (13) on both sides of film strip; upper stamping assembly is driven by cylinder extension rod, and includes upper moving plate (31), upper heating plate (32) fixed to the lower side of upper moving plate (31), and upper stamping plate (33) arranged below upper heating plate (32); the bottom surface of upper stamping plate (33) is provided with stamping lines; lower stamping assembly is driven by cylinder extension rod; and includes lower moving plate (34), lower heating plate (35) fixed to the upper side of lower moving plate (34), and lower stamping plate (36) arranged above lower heating plate (35); the top surface of lower stamping plate (36) is provided with stamping lines; center stamping assembly includes center heating plate (37), and center stamping plate (38) fixed to the upper and lower surfaces of center heating plate (37); the outer side surfaces of two center stamping plates (38) are provided with stamping lines.

2. The integrated forming method of the environment-friendly plastic bag with the anti-skid handle structure according to claim 1, characterized in that, The pressing block (45) is an electric heating block.

3. An environment-friendly plastic bag having an anti-skid handle structure, which is made by the method of claim 1, characterized in that, The bag body (11) is provided with M-fold (13) structure on both sides, and the bottom of M-fold (13) is inner folding line (14); the lower side of bag body (11) away from handle (12) is provided with first sealing edge (16), and the upper side of handle (12) away from bag body (11) is provided with second sealing edge (17); the handle hole (18) is formed in the handle (12), and the tab (19) integrally connected with the handle (12) is folded in the handle hole (18); the outer surface of handle (12), the inner surface of handle hole (18) and the surface of tab (19) are all provided with anti-skid lines.

4. The environment-friendly plastic bag with anti-skid handle structure according to claim 3, characterized in that, The anti-skid lines are formed by hot stamping, and the tab (19) is fixed on the inner surface of handle (12) by hot stamping.

5. The environment-friendly plastic bag with anti-skid handle structure according to claim 4, characterized in that, The pattern of anti-skid lines is concave-convex.

6. The environment-friendly plastic bag with anti-skid handle structure according to claim 3, characterized in that, The inner side of the connection between the lower end of the two handles (12) and the bag body (11) is provided with an arc-shaped corner.

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