Non-woven fabric bag film coating control device

Abstract

The utility model discloses a kind of non-woven fabric bag membrane control grammage devices, belong to non-woven fabric bag production device technical field, including frame body;Three conveying mechanisms, three The conveying mechanism is installed on frame body, and respectively conveying has one way non-woven fabric and two way outer membrane;Spray mould mechanism, the extruder of the spray mould mechanism is installed on frame body, the die head is communicated with the output end of the extruder, the output end of the die head is communicated with two die orifices, two The die orifice is used to the two-side output adhesive layer of non-woven fabric.The utility model realizes flow distribution by setting three-way regulating valve, avoid because one side die orifice flow too large leads to two-side adhesive layer one side too thick, one side too thin, combine the flow guiding effect of radial drainage groove, further guarantee the thickness uniformity of two-side adhesive layer, improve the overall structure stability of composite membrane;And the thickness of adhesive layer is detected on-line by detection equipment, local grammage deviation can be found in time.

Description

Technical Field

[0001] This utility model belongs to the technical field of nonwoven bag production equipment, and in particular relates to a nonwoven bag coating control weight device. Background Technology

[0002] Non-woven bags are widely used in food packaging, daily necessities storage, and medical protective equipment due to their lightweight, biodegradability, and reusability. In the production of non-woven bags, a coating process is usually required, where a layer of molten thermoplastic is applied to the surface of the non-woven fabric to form an adhesive layer. This gives the non-woven bag key properties such as waterproofing, leak-proofing, and abrasion resistance. The basis weight of the adhesive layer directly determines the performance and production cost of the non-woven bag. Too low a basis weight can easily lead to film rupture and waterproofing failure, while too high a basis weight increases raw material consumption, raises production costs, and causes the bag to become stiff and have a poor feel.

[0003] In the existing technology, a single composite roller segmented composite and traction steering structure is used to achieve bidirectional composite of a single device to reduce space. However, this method requires an additional traction steering structure, which increases costs, reduces production efficiency, and lacks detection and control of coating weight, thus reducing the overall stability of the composite film structure. Utility Model Content

[0004] The purpose of this invention is to propose a nonwoven bag coating control weight device to solve the problems of traditional technology, which requires additional traction and steering structures, increasing costs and reducing production efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A nonwoven bag coating weight control device, comprising: Frame; Three conveying mechanisms are installed on the frame, and each conveys one non-woven fabric and two outer films respectively. A coating mechanism includes an extruder mounted on a frame, the output end of the extruder being connected to a die head, the output end of the die head being connected to two die orifices, the two die orifices being used to output adhesive layers to both sides of the nonwoven fabric; The nonwoven fabric is bonded to the two outer films through adhesive layers on corresponding sides to form a composite film. The testing equipment is mounted on the frame and is used to test the thickness of the adhesive layer on the composite film. The testing equipment, the conveying mechanism, and the coating mechanism are all electrically connected to a controller.

[0006] Preferably, the die head is inverted U-shape and has an inner cavity at the top. The input end of the inner cavity is connected to the output end of the extruder, and the output end is connected to a three-way regulating valve. The two output ports of the three-way regulating valve are connected to two die openings in a one-to-one correspondence. The two die openings are opened at both ends of the die head in a one-to-one correspondence and are arranged opposite each other to form a coating area.

[0007] Preferably, the inner side of the die opening is provided with multiple drainage grooves, which are radially distributed toward the nonwoven fabric with the output interface of the three-way regulating valve as the center.

[0008] Preferably, the conveying mechanism for conveying the outer film includes an adjustable conveying roller, an electric telescopic rod is mounted on the frame, the output end of the electric telescopic rod is fixedly connected to the conveying frame, the conveying roller is rotatably connected to the conveying frame, and the outer film passes around the conveying roller.

[0009] Preferably, the controller is mounted on the frame and is used to receive signals from the detection equipment and control the working status of the conveying mechanism and the extruder.

[0010] Preferably, a collection trough is fixedly connected to the frame, and the collection trough is located directly below the coating area.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention enables simultaneous double-sided coating of nonwoven fabric by setting two opposing dies on a single die head, eliminating the need for additional traction and steering structures, thus reducing costs and improving production efficiency. A three-way regulating valve distributes the flow, preventing uneven thickness of the adhesive layer due to excessive flow from one die orifice. Combined with the guiding effect of radial drainage channels, this further ensures the uniformity of the adhesive layer thickness, enhancing the overall stability of the composite film structure. Furthermore, online detection of the adhesive layer thickness allows for timely detection of localized weight deviations. The controller manages the operation of the conveying mechanism and extruder, ensuring the stability of the coating weight. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of a nonwoven bag coating weight control device proposed in this utility model; Figure 2 This is a schematic diagram of the coating zone structure of a nonwoven bag coating weight control device proposed in this utility model; Figure 3 This is a vertical cross-sectional view of the die head of a nonwoven bag coating control weight device proposed in this utility model.

[0013] In the diagram: 1. Frame; 2. Extruder; 3. Die head; 4. Inner cavity; 5. Three-way regulating valve; 6. Die opening; 7. Drainage channel; 8. Adhesive layer; 9. Non-woven fabric; 10. Electric telescopic rod; 11. Conveyor roller; 12. Outer film; 13. Coating zone; 14. Composite film; 15. Controller; 16. Collection tank. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] Reference Figures 1-3 A nonwoven bag coating weight control device, comprising: Frame 1.

[0016] Three conveying mechanisms are installed on the frame 1, and each conveys one non-woven fabric 9 and two outer membranes 12 respectively.

[0017] The conveying mechanism uses existing unwinding, winding and tensioning devices to stably and tautly convey the nonwoven fabric 9 or the outer film 12.

[0018] The outer membrane 12 is a heat-insulating film or other protective film in the prior art.

[0019] The conveying mechanism for the outer film 12 includes an adjustable conveying roller 11, an electric telescopic rod 10 is mounted on the frame 1, the output end of the electric telescopic rod 10 is fixedly connected to the conveying frame, the conveying roller 11 is rotatably connected to the conveying frame, and the outer film 12 passes around the conveying roller 11.

[0020] When the electric telescopic rod 10 is working, its output end adjusts the distance between the conveying roller 11 and the nonwoven fabric 9 through the conveying frame, so as to adapt to nonwoven fabrics 9 and outer film 12 of different thicknesses.

[0021] The coating mechanism includes an extruder 2 mounted on a frame 1. The output end of the extruder 2 is connected to a die head 3. The output end of the die head 3 is connected to two die openings 6. The two die openings 6 are used to output the adhesive layer 8 to both sides of the nonwoven fabric 9.

[0022] The extruder 2 uses existing technology to melt and transport plastic through a screw conveyor. The molten plastic is transported and cooled to finally form the adhesive layer 8, which improves the connection strength between the nonwoven fabric 9 and the outer film 12.

[0023] The two sides of the nonwoven fabric 9 are bonded to the two outer membranes 12 through the corresponding adhesive layers 8 to form a composite membrane 14.

[0024] The frame 1 is equipped with a pressing device, which is used to press the outer membrane 12, the adhesive layer 8 and the non-woven fabric 9 together to form a composite membrane 14.

[0025] The testing equipment is installed on the frame 1 and is used to test the thickness of the adhesive layer 8 on the composite film 14. The testing equipment, the conveying mechanism and the coating mechanism are all electrically connected to the controller 15.

[0026] The testing equipment uses an infrared thickness gauge, which is a technology already in use, to perform non-contact measurement on the composite film 14, thus avoiding damage to the composite film 14.

[0027] The die head 3 is inverted U-shape and has an inner cavity 4 at the top. The input end of the inner cavity 4 is connected to the output end of the extruder 2. The output end is connected to a three-way regulating valve 5. The two output ports of the three-way regulating valve 5 are connected to two die openings 6. The two die openings 6 are opened at both ends of the die head 3 and are arranged opposite each other, forming a coating area 13.

[0028] The three-way regulating valve 5 uses existing technology to regulate the amount of molten plastic entering the two die openings 6, so as to keep the coating quality of the two sides of the nonwoven fabric 9 relatively consistent.

[0029] Multiple drainage grooves 7 are provided inside the die opening 6. The multiple drainage grooves 7 are radially distributed towards the nonwoven fabric 9 with the output interface of the three-way regulating valve 5 as the center.

[0030] The molten plastic is guided to the nonwoven fabric 9 by multiple drainage channels 7, forming a relatively consistent coating effect and ensuring the relatively consistent thickness of the adhesive layer 8.

[0031] Meanwhile, considering the fluidity of the adhesive layer 8, drainage grooves 7 with different angles and densities can be set to form an adhesive layer 8 that is thicker at the top and thinner at the bottom, so that the adhesive layer 8 maintains a relatively consistent thickness after natural flow.

[0032] The controller 15 is mounted on the frame 1 and is used to receive signals from the detection equipment and control the working status of the conveying mechanism and the extruder 2.

[0033] When the detection equipment detects that the thickness of the cooled adhesive layer 8 is high, the controller 15 receives this signal and controls the conveying mechanism to increase the conveying speed or the extruder 2 to decrease the extrusion speed. When the thickness of the adhesive layer 8 is low, the controller 15 controls the conveying mechanism to decrease the conveying speed or the extruder 2 to increase the extrusion speed to ensure the consistency of the thickness of the adhesive layer 8. When using nonwoven fabric 9 to prepare nonwoven bags, the control of the nonwoven bag coating weight is completed.

[0034] A collection tank 16 is fixedly connected to the frame 1. The collection tank 16 is located directly below the coating area 13 and is used to collect accidentally dropped molten plastic.

[0035] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A device for controlling the weight of nonwoven bags after lamination, characterized in that, include: Frame (1); Three conveying mechanisms are installed on the frame (1) and convey one non-woven fabric (9) and two outer membranes (12) respectively. The coating mechanism includes an extruder (2) mounted on a frame (1), the output end of the extruder (2) is connected to a die head (3), the output end of the die head (3) is connected to two die openings (6), and the two die openings (6) are used to output adhesive layers (8) to both sides of the nonwoven fabric (9). The two sides of the nonwoven fabric (9) are bonded together with the two outer membranes (12) through the adhesive layer (8) on the corresponding sides to form a composite membrane (14). The testing equipment is installed on the frame (1) and is used to test the thickness of the adhesive layer (8) on the composite film (14). The testing equipment, the conveying mechanism and the coating mechanism are all electrically connected to a controller (15).

2. The nonwoven bag coating weight control device according to claim 1, characterized in that, The die head (3) is inverted U-shaped and has an inner cavity (4) at the top. The input end of the inner cavity (4) is connected to the output end of the extruder (2), and its output end is connected to a three-way regulating valve (5). The two output ports of the three-way regulating valve (5) are connected to two die openings (6) in a one-to-one correspondence. The two die openings (6) are opened at both ends of the die head (3) in a one-to-one correspondence and are arranged opposite to each other, forming a coating area (13).

3. The nonwoven bag coating weight control device according to claim 2, characterized in that, Multiple drainage grooves (7) are provided inside the die opening (6). The multiple drainage grooves (7) are radially distributed towards the nonwoven fabric (9) with the output interface of the three-way regulating valve (5) as the center.

4. The nonwoven bag coating weight control device according to claim 1, characterized in that, The conveying mechanism for conveying the outer membrane (12) includes an adjustable conveying roller (11), an electric telescopic rod (10) is installed on the frame (1), the output end of the electric telescopic rod (10) is fixedly connected to the conveying frame, the conveying roller (11) is rotatably connected to the conveying frame, and the outer membrane (12) passes around the conveying roller (11).

5. The nonwoven bag coating weight control device according to claim 4, characterized in that, The controller (15) is mounted on the frame (1) and is used to receive signals from the detection equipment and control the working status of the conveying mechanism and the extruder (2).

6. The nonwoven bag coating weight control device according to claim 2, characterized in that, A collection trough (16) is fixedly connected to the frame (1), and the collection trough (16) is located directly below the coating area (13).

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