Packaging bag edge inserting machine

Abstract

The utility model discloses a packaging bag edge inserting machine which aims at solving the technical problems that in the prior art, packaging bags are prone to rebound after edge inserting, and the edges are irregular. The edge inserting machine comprises a rack which is sequentially provided with an unwinding station, a two-side edge inserting station and a heat setting output station. The method is characterized in that edge inserting stations on the two sides are of a tripod structure with an inclined guide plate, and the two sides of a packaging bag are smoothly folded inwards in cooperation with an inflation expansion device and an upper pressing roller; and the heat setting output station is provided with a copper hot-pressing block through a transversely adjustable guide block, local heating and softening are carried out on the inserting edge part by utilizing an arc-shaped hot-pressing groove matched with an upper guide roller, and compaction and setting are immediately carried out through an auxiliary pressing roller and the upper guide roller. The packaging bag edge inserting device can effectively overcome material springback, ensures that the edge inserting part is flat, firm and permanently shaped, and remarkably improves the product quality and the production efficiency of packaging bags.

Description

Technical Field

[0001] This utility model relates to the field of packaging machinery technology, and in particular to a packaging bag inserting machine. Background Technology

[0002] In the packaging industry, flexible packaging bags typically require printing patterns or text on their surface during production. After printing, to facilitate subsequent stacking and save storage and transportation space, the two sides of the packaging bag need to be folded inwards; this process is called "edge folding." Traditional edge folding processes mostly use mechanical folding or manual folding.

[0003] However, the existing technology has significant drawbacks: First, the printed packaging bag material has a certain elastic memory effect. After the two sides are folded inward, the folded edges are prone to elastic rebound, resulting in the two sides not being able to fit tightly against the bag body, resulting in unevenness, curling edges, and other phenomena. Second, due to the presence of the ink layer on the surface of the packaging bag and the physical properties of the film itself, simple mechanical extrusion is not enough to permanently shape the folded edges, which seriously affects the appearance quality of the packaging bag and the subsequent sealing performance.

[0004] Therefore, how to provide an inserting device that can effectively overcome the springback of the insert and ensure the flatness and shaping of the folded edge, thereby improving the yield of finished packaging bags, has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0005] This utility model aims to overcome the shortcomings of the prior art and provide a packaging bag edge-inserting machine to solve the technical problems of easy rebound, irregular edges, and poor shaping effect after the packaging bag is edge-inserted. This will achieve flat and firm shaping of the edge-inserted packaging bags on both sides, thereby improving product quality and production efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a packaging bag edge-inserting machine, characterized in that it includes a frame, wherein the frame is provided with an unwinding station, two side edge-inserting stations and an edge-inserting heat-setting output station 400 in sequence along the material conveying direction;

[0007] The unwinding station includes an unwinding roller rotatably mounted on the frame, which is used to release the printed packaging bag roll material.

[0008] The two side insertion stations are located above the machine frame. The structure includes a triangular frame with two inclined guide plates symmetrically arranged on the triangular frame. The tops of the two inclined guide plates are close together. A pair of pressure rollers are arranged above the triangular frame.

[0009] The heat-setting output station of the insertion section includes multiple upper guide rollers and multiple lower guide rollers arranged laterally along the conveying direction. The upper guide rollers and the lower guide rollers are staggered vertically. A transverse guide rod is also fixedly installed on the frame. Two guide blocks are slidably installed on the transverse guide rod. The guide blocks are adjustablely fixed on the transverse guide rod by tightening screws. A hot pressing block is installed on the guide block. The hot pressing block is provided with an arc-shaped hot pressing groove that matches the peripheral wall of the upper guide roller. The arc-shaped hot pressing groove is close to one of the upper guide rollers. An auxiliary pressure roller is also provided corresponding to the hot pressing block. The auxiliary pressure roller is close to the hot pressing block and attached to the adjacent upper guide roller.

[0010] Furthermore, the unwinding roller is driven by a servo motor.

[0011] Furthermore, the packaging bags output from the unwinding station are guided by the first guide roller group before reaching the two side inserting stations, and are inflated by gas before entering the tripod.

[0012] Furthermore, the packaging bags, which have been initially compacted by the pressure rollers at the two side insertion stations 300, are conveyed to the heat-setting output station 400 at the insertion section via the second guide roller group.

[0013] Furthermore, the hot pressing block is a copper block, and a heating rod is inserted inside the copper block to achieve rapid and uniform heating of the inserted edge.

[0014] Furthermore, the upper and lower guide rollers are arranged alternately on the frame to support and guide the packaging bags.

[0015] Furthermore, the gap between the two pressure rollers is directly opposite the output outlet of the tripod, and is used to receive and compact the insertion edge formed by the inclined guide plate.

[0016] Furthermore, the arc of the arc-shaped hot pressing groove of the hot pressing block is equal to the circumference radius of the corresponding upper guide roller. During operation, the packaging bag is released from the unwinding station 200, and after being initially flattened, it is inflated to an expanded state before entering the two side insertion stations 300. The expanded packaging bag enters the wedge-shaped channel formed by the inclined guide plate, and its two sides are squeezed and adhered to the surface of the inclined guide plate under pressure, naturally forming an inward fold. Then it enters the space between the upper and lower pressure rollers and is compacted. The initially compacted packaging bag enters the heat-setting output station 400 of the insertion part, where its insertion part is heated and softened when passing through the arc-shaped groove. Then it is immediately sent into the compaction gap between the auxiliary pressure roller and the upper guide roller for cooling and shaping, and finally output through the conveying guide roller group.

[0017] Furthermore, the unwinding roller is driven by a servo motor to ensure constant tension and constant speed unwinding.

[0018] The beneficial effects of this utility model are:

[0019] 1. Dual anti-springback mechanism to ensure absolute flatness: This utility model pioneers a dual anti-springback mechanism of "mechanical pre-folding + thermoplastic shaping". First, through the combination of "inflatable expansion + wedge guide plate", mechanical inward folding is completed in the material's most relaxed and easily shaped state, and the shape is immediately locked by the pressure roller, overcoming initial springback. Second, through the thermosetting process of "local heating + inter-roller compaction", the molecular-level structure of the already formed folded edge is reshaped, causing irreversible thermoplastic deformation, eliminating the possibility of springback from a physical perspective, and ensuring the permanent flatness of the folded edge.

[0020] 2. Dynamically Adjustable Heat Setting with High Versatility: The heat setting component, through its structural design of "lateral guide rod + guide block + locking element," achieves flexible and precise adjustment of the hot pressing block position. This allows a single machine to easily adapt to packaging bags of different widths, and simple adjustments are all it takes to accurately heat and compact the edges of different sizes, greatly improving the equipment's versatility and production line flexibility.

[0021] 3. Compact structure and efficient process: The complex edge insertion and shaping processes are integrated into a continuous automated production line. From unwinding, edge insertion, shaping to rewinding, it is completed in one go without interruption or manual intervention, which significantly improves production efficiency and reduces labor costs and defect rate.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model;

[0024] Figure 2 This is a front view of a specific embodiment of the present utility model;

[0025] Figure 3 for Figure 1 Enlarged view of A in the middle;

[0026] Figure 4 This is a perspective view of the guide block in a specific embodiment of the present invention.

[0027] Explanation of reference numerals in the attached drawings: 101, frame; 102, unwinding roller; 104, first guide roller group; 201, tripod; 202, inclined guide plate; 203, pressure roller; 204, second guide roller group; 301, upper guide roller; 302, lower guide roller; 303, transverse guide rod; 304, guide block; 306, hot pressing block; 307, arc-shaped hot pressing groove; 308, auxiliary pressure roller; 200, unwinding station; 300, side edge insertion station; 400, edge heat setting output station. Detailed Implementation

[0028] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0029] like Figure 1 — Figure 4 As shown in the figure, this embodiment discloses a packaging bag edge-insertion machine. Its core concept lies in constructing a closed-loop control system that combines "physical preforming" and "thermodynamic shaping" to solve the persistent pain points in the field of packaging bag edge-insertion.

[0030] In the workflow, the printed packaging bag rolls are installed at the unwinding station 200. The core of this station is the unwinding roller 102, which is precisely driven by a servo motor. The introduction of the servo system is not only for uniform unwinding, but more importantly, it provides a stable foundation for subsequent tension control and edge-stitching accuracy. The packaging bags are guided and initially flattened by the first guide roller group 104.

[0031] The crucial edge-insertion operation occurs at the edge-insertion stations 300 on both sides. A key tripod 201 is located here, with two symmetrical inclined guide plates 202. The working principle here is "plastic deformation under geometric constraints": before the packaging bag enters the wedge-shaped inlet, the system injects a suitable amount of gas into it through a nozzle (not shown), causing the film to fully expand and reach maximum tension. This "pre-stretched" state is crucial because it eliminates the film's inherent wrinkling stress. Subsequently, the inflated packaging bag enters the wedge-shaped inlet, its two edges forced to slide against the inclined guide plates 202 and be squeezed downwards and inwards. This process utilizes the low elastic modulus of the film in a stretched state, causing it to fold smoothly inwards under pressure rather than being forcibly broken. Immediately afterwards, the folded edges enter between the two pressure rollers 203 above. This step is "physical locking," designed to fix the newly formed crease and prevent rebound due to stress release after leaving the wedge channel.

[0032] Subsequently, the packaging bag, carrying the pre-locked insert edge, is smoothly conveyed via the second guide roller group 204 to the downstream insert edge heat setting output station 400. The design of this station is the essence and innovation of this solution. It includes multiple sets of upper guide rollers 301 and lower guide rollers 302 arranged in an alternating manner, which together form a stable conveying path for the packaging bag.

[0033] To achieve precise heat setting, a parallel transverse guide rod 303 is fixed on the frame 101. Two guide blocks 304 are slidably mounted on the transverse guide rod 303, corresponding to the insert edges on both sides of the packaging bag. The operator can precisely adjust the position of the guide blocks 304 on the transverse guide rod 303 by loosening and tightening the loosening screws. A hot pressing block 306 is rigidly connected to the lower end of each guide block 304. The bottom surface of the hot pressing block 306 is machined with an arc-shaped hot pressing groove 307, the curvature of which perfectly matches the outer circumference of the upper guide roller 301. In this embodiment, one of the hot pressing blocks 306 is adjusted to be precisely aligned with the upper guide roller 301 above it. Simultaneously, an auxiliary pressure roller 308 is also provided on one side of the upper guide roller 301, ensuring it is in close contact with the surface of the upper guide roller 301.

[0034] During operation, the packaging bag with the inserted edge moves to this point, and its inserted edge falls precisely into the arc-shaped hot pressing groove 307. The heating rod inserted inside the hot pressing block 306 acts to heat the copper hot pressing block 306, efficiently transferring heat to the inserted edge, causing it to soften locally. Immediately afterwards, the softened inserted edge moves with the packaging bag and is fed into the narrow gap formed by the auxiliary pressure roller 308 and the upper guide roller 301. Here, the high-temperature softened film edge is forcefully pressed and cooled, instantly solidifying and shaping. This "heating-softening-pressing-cooling" process is a typical thermoplastic molding process, which changes the local microstructure of the film, giving it a permanent, spring-resistant folded edge shape.

[0035] Finally, the perfectly shaped packaging bags are alternately supported and guided by the upper guide roller 301 and the lower guide roller 302, and are eventually neatly wound up by the take-up roller. The entire process, from material handling and shape shaping to structural stabilization, is interconnected and constitutes a complete technical solution.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A packaging bag edge-inserting machine, characterized in that, The system includes a frame (101), which is provided with an unwinding station (200), two side edge-insertion stations (300), and an edge-insertion heat-setting output station (400) in sequence along the material conveying direction. The unwinding station (200) includes an unwinding roller (102) rotatably mounted on the frame (101), which is used to release the printed packaging bag roll. The two side edge-insertion stations (300) are located above the frame (101) and include a tripod (201) with two inclined guide plates (202) symmetrically arranged on the tripod (201), the tops of which are close together. A pair of pressure rollers (203) are provided above the tripod (201) on the frame (101). The edge-insertion heat-setting output station (400) includes multiple upper guides arranged laterally along the conveying direction. The frame (101) includes an upper guide roller (301) and multiple lower guide rollers (302), with the upper guide roller (301) and the lower guide rollers (302) arranged alternately. A transverse guide rod (303) is also fixedly installed on the frame (101). Two guide blocks (304) are slidably installed on the transverse guide rod (303). The guide blocks (304) are adjustablely fixed on the transverse guide rod (303) by tightening screws. A hot pressing block (306) is installed on the guide block (304). The hot pressing block (306) is provided with an arc-shaped hot pressing groove (307) that matches the peripheral wall of the upper guide roller (301). The arc-shaped hot pressing groove (307) is close to one of the upper guide rollers (301). An auxiliary pressure roller (308) is also provided corresponding to the hot pressing block (306). The auxiliary pressure roller (308) is close to the hot pressing block (306) and attached to the adjacent upper guide roller (301).

2. The packaging bag sewing machine according to claim 1, characterized in that, The unwinding roller (102) is driven by a servo motor.

3. The packaging bag sewing machine according to claim 1, characterized in that, The packaging bags output from the unwinding station (200) are guided by the first guide roller group (104) before reaching the two side inserting stations (300), and are inflated by gas before entering the tripod (201).

4. The packaging bag sewing machine according to claim 1, characterized in that, The packaging bag, which has been initially compacted by the pressure rollers (203) at the two side insertion stations (300), is conveyed to the heat setting output station (400) of the insertion section through the second guide roller group (204).

5. The packaging bag sewing machine according to claim 1, characterized in that, The hot press block (306) is a copper block, and a heating rod is inserted inside the copper block.

6. The packaging bag sewing machine according to claim 1, characterized in that, The upper guide roller (301) and the lower guide roller (302) are arranged alternately on the frame to support and guide the packaging bags.

7. The packaging bag sewing machine according to claim 1, characterized in that, The gap between the two pressure rollers (203) is directly opposite the output outlet of the tripod (201) and is used to receive and compact the insert portion formed by the inclined guide plate (202).

8. The packaging bag sewing machine according to claim 1, characterized in that, The arc of the arc-shaped hot pressing groove (307) of the hot pressing block (306) is equal to the circumference radius of the corresponding upper guide roller (301).

Images