Non-woven fabric bag adopting hot melt adhesive compounding and implementation method thereof

Abstract

The application provides a non-woven fabric bag adopting hot melt adhesive compounding and an implementation method thereof. The non-woven fabric bag adopting hot melt adhesive compounding comprises: a non-woven fabric bag body; two handle structures, which are respectively arranged on the outer surface of the non-woven fabric bag body; and a film layer, which is arranged on the outermost layer of the non-woven fabric bag body and is provided with a first hot melt adhesive bonding layer on the inner surface. The non-woven fabric bag adopting hot melt adhesive compounding has excellent waterproof, stain-resistant and puncture-resistant properties due to the film layer, is suitable for shopping, logistics, catering and other scenes, the interlayer peeling strength reaches the base material damage level, the handle structure is firmly connected, can bear 10 kg without delamination and cracking, the production line speed can reach 200-400 m / min, the drying channel equipment is not needed, continuous and large-scale production can be realized, and the product performance, environmental protection level, production efficiency and manufacturing cost are comprehensively optimized, and the market competitiveness of the double-layer non-woven fabric bag is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of nonwoven bag technology, and in particular to a nonwoven bag using hot melt adhesive bonding and its implementation method. Background Technology

[0002] Non-woven bags are environmentally friendly packaging products made from polypropylene and other resins as raw materials. They are produced by spinning into a web, hot pressing or needle punching to reinforce the fabric, and then cutting, laminating, sewing or heat-forming them. They are lightweight, have good load-bearing capacity, are breathable, reusable and biodegradable. They are widely used in shopping, logistics, catering and cold chain scenarios and are the core alternative to traditional plastic bags.

[0003] With the upgrading of environmental protection policies and the increasing demand for biodegradable packaging, non-woven bags have become the mainstream alternative to plastic shopping bags, logistics packaging, and food cold chain packaging. The interlayer composite process directly determines the product's strength, sealing performance, heat preservation, and service life. Currently, the industry generally uses four composite methods: lamination, traditional hot melt adhesive, solvent adhesive, and water-based adhesive. None of these methods can simultaneously meet the five requirements of multi-layer structure composite, low energy consumption, no substrate damage, high bonding strength, and large-scale production.

[0004] Existing single-layer nonwoven bags have low strength and no protective properties. Traditional composite processes use high-temperature adhesives, lamination, and water-based adhesives, which have problems such as substrate damage, insufficient strength, high energy consumption, and VOC emissions. They cannot meet the comprehensive requirements of general shopping and logistics scenarios for bags in terms of load-bearing capacity, tear resistance, waterproofing, and environmental protection.

[0005] Therefore, it is necessary to provide a nonwoven bag using hot melt adhesive lamination and a method for achieving it to solve the above-mentioned technical problems. Summary of the Invention

[0006] This invention provides a nonwoven bag and its implementation method using hot melt adhesive lamination, which solves the problems of existing single-layer nonwoven bags having low strength and no protection, and traditional lamination processes easily damaging the substrate, insufficient strength, high energy consumption and VOC emissions, failing to meet the requirements of load-bearing, tear resistance, waterproofing and environmental protection.

[0007] To solve the above-mentioned technical problems, the present invention provides a non-woven bag using hot melt adhesive composite and a method for implementing it, comprising: a non-woven bag body; Two handle structures are respectively installed on the outer surface of the nonwoven bag body; A film layer, the film layer being located on the outermost layer of the nonwoven bag body, and a first hot melt adhesive layer being provided on the inner surface of the film layer; A nonwoven fabric layer is disposed on the inner surface of the first hot melt adhesive layer.

[0008] Preferably, the handle structure includes a handle-bag body connection point and a handle, wherein the handle-bag body connection point is used to fix both ends of the handle to the non-woven bag body; Both ends of the handle must be straight and fit snugly against the outside of the bag body, without twisting or shifting. The connection points between the handle and the main body of the non-woven bag are fixed at multiple points evenly, with symmetrical positions and consistent spacing. There should be no excess adhesive or wrinkles in the fixed area to ensure balanced force distribution and prevent cracking or detachment during long-term lifting.

[0009] Preferably, the first hot melt adhesive layer is a reactive polyurethane hot melt adhesive, the nonwoven fabric layer material is PP spunbond nonwoven fabric, and the film layer material is PP biaxially oriented film.

[0010] Preferably, a second hot melt adhesive layer is provided on the inner surface of the nonwoven fabric layer, and a heat-insulating functional film layer is provided on the inner surface of the second hot melt adhesive layer, wherein the heat-insulating functional film layer is made of aluminum foil film. EPE insulation film can also be used for the thermal insulation function layer, with the thickness controlled between 20 μm and 80 μm.

[0011] Preferably, a sealing cap is installed on the top of the nonwoven bag body, and a sealing structure is installed on one side of the sealing cap. The sealing structure includes a protective strip and an adhesive strip, and the protective strip and the adhesive strip are attached together. The adhesive strip is attached to one side of the sealing cap. After the protective strip is torn off, the adhesive strip can be used to connect one side of the sealing cap to the main body of the non-woven bag to achieve the function of sealing. The sealing cap is located at the top of the main body of the non-woven bag, near one side.

[0012] Preferably, a side limiting component is installed on one side of the inner wall of the nonwoven bag body, and a placement bag is installed on one side of the inner wall of the nonwoven bag body. The side limiting components and placement bags are made of the same material as the main body of the non-woven bag, and the size of the side limiting components depends on the type of bag to be loaded.

[0013] Preferably, the side limiting assembly includes two connecting straps and a limiting strap, wherein the two connecting straps are used to fix the two ends of the limiting strap inside the nonwoven bag body.

[0014] A method for realizing a nonwoven bag using hot melt adhesive lamination, wherein the method for realizing the nonwoven bag using hot melt adhesive lamination includes the following steps: S1: First, complete the selection, modification, and preparation of raw and auxiliary materials. Select the anilox roller coating laminating machine as the core production equipment. Add a corona treatment device and a pressure plate hot melt adhesive supply device to the equipment. The corona treatment device includes a corona treatment roller and a corona discharge electrode. The pressure plate hot melt adhesive supply device includes a pressure plate hot melt adhesive machine and a temperature-controlled heating tube. At the same time, use auxiliary structures such as the first guide roller, the second guide roller, the third guide roller, and the cooling roller. Select hot melt adhesive as the special composite adhesive. Prepare non-woven fabric rolls, films, and heat-insulating functional film layers for making thermal bags. Ensure that the equipment and materials meet the requirements of hot melt adhesive lamination production. After modification, the equipment can be adapted to the needs of closed heating, constant temperature conveying, intermittent quantitative coating, and continuous lamination production. S2: The nonwoven fabric roll and the film are smoothly released through the unwinding mechanism. The two substrates are sequentially guided and smoothed by the first guide roller, the second guide roller, and the third guide roller to ensure that there are no wrinkles, no deviation, and uniform tension during the substrate conveying process. The composite surface of the nonwoven fabric is corona activated by the high voltage electric field between the corona treatment roller and the corona discharge electrode. The plasma generated by the high frequency and high voltage discharge ionizes the air and bombards the surface of the nonwoven fabric to achieve physical roughening and chemical modification, implant polar groups and improve surface wettability, significantly improving the surface activity of the substrate and the subsequent bonding strength. S3: Solid hot melt adhesive is placed inside the pressure plate type hot melt adhesive machine for sealed heating. The pressure plate presses down to melt only the surface layer of adhesive, achieving instant melting for use and effectively preventing adhesive aging and carbonization. The molten adhesive is then transported to the anilox roller, where the engraved dots on the roller surface are used to coat the adhesive completely and evenly onto the film surface. The adhesive flow remains stable throughout the process, with no back-condensation, no overflow, and no missed coating. S4: The coated film and the corona-treated nonwoven fabric are simultaneously introduced into the composite area between the pressure roller and the glue roller. Under constant temperature and appropriate mechanical pressure, hot-pressing is performed. The pressure removes the air between the two substrates, allowing the adhesive to fully wet the pores of the nonwoven fabric and penetrate into the microscopic surface of the film, forming a dual combination structure of molecular attraction and mechanical interlocking. After the composite is completed, the material is immediately cooled by forced air cooling or water cooling through the cooling roller, which allows the hot melt adhesive to quickly change from liquid to solid and lock the bonding strength. Finally, the winding structure smoothly winds up the formed composite material with constant tension, ensuring that the winding end face is neat and without any tightness difference. S5: Place the finished composite material roll at room temperature for full curing treatment, so that the hot melt adhesive can fully undergo a moisture curing reaction, allowing the adhesive's bonding performance, weather resistance, and water resistance to reach the optimal stable state. This ensures that the composite roll can meet the performance requirements of various usage scenarios such as shopping, logistics, catering, and cold chain logistics, and avoids problems such as delamination, insufficient peel strength, and delamination. S6: The matured composite material is precisely cut to the required size of the bag body. The handle is installed by welding or sewing and the connection point between the handle and the bag body is firmly fixed to form a double-layer composite non-woven bag with a film layer, a hot melt adhesive layer, and a non-woven fabric layer. If a three-layer composite heat-insulating non-woven bag is to be made, the film layer, hot melt adhesive layer, non-woven fabric layer, hot melt adhesive layer and heat-insulating film layer are laminated in sequence. After cutting and shaping, a sealing device and sealing cap are added to complete the entire production process of the heat-insulating non-woven bag. The finished product has high composite strength, good heat insulation, burst strength and tear resistance.

[0015] Preferably, the adhesive application rate control accuracy of the anilox roller coating laminator in S1 is 0.1 g / m. 2 The machine has a total power of 25kW / unit, a tension control accuracy of 1N, and an operating speed of 200-400m / min; the heating power of the pressure plate type hot melt adhesive machine is 5KW, the temperature control accuracy is 1℃, and the average core heating energy consumption is 0.4kJ / m. 2 In S2, the surface energy of the nonwoven fabric after being treated by a corona treatment roller and a corona discharge electrode is 36 dyne / cm. The corona treatment achieves surface micro-roughening and polar group implantation through high-voltage plasma bombardment.

[0016] Preferably, the heating temperature of the hot melt adhesive in step S3 is 140℃~150℃, and the amount of adhesive applied is stably controlled at 2~4g / m². 2 In S4, the hot pressing temperature of the pressure roller is controlled at 100~110℃, the composite pressure is 0.2-2.0MPa, and the cooling roller adopts air cooling or water cooling to achieve rapid curing and shaping.

[0017] Compared with related technologies, the non-woven bag using hot melt adhesive lamination and its implementation method provided by the present invention have the following beneficial effects: This invention provides a nonwoven bag using hot melt adhesive composite. The nonwoven bag body designed in this way completely avoids damage to the nonwoven fabric layer caused by high temperature, and the bag's burst strength, seam strength, and heat insulation are significantly improved, resulting in stronger stability in use. The amount of hot melt adhesive used in the first layer is reduced by more than 75% compared to lamination and water-based adhesive processes, resulting in significant plastic reduction and environmental protection effects. The lamination temperature is reduced to 140℃~150℃, and the core heating energy consumption is reduced by more than 90%, resulting in obvious energy-saving and carbon-reducing advantages in production. There are no VOC emissions during the lamination process, meeting the environmental protection requirements of high-end packaging such as food and baby products, and making the production environment safer. The film layer gives the bag excellent waterproof, stain-resistant, and puncture-resistant properties, making it suitable for use in shopping, logistics, catering and other scenarios. The interlayer peel strength reaches the level of substrate damage, the handle structure is firmly connected, and it can withstand a load of 10kg without delamination or cracking. The production line speed can reach 200~400m / min, without the need for drying tunnel equipment, enabling continuous large-scale production. It achieves comprehensive optimization in product performance, environmental protection level, production efficiency and manufacturing cost, greatly enhancing the market competitiveness of double-layer non-woven bags. Attached Figure Description

[0018] Figure 1 A schematic diagram of the first embodiment of the nonwoven bag using hot melt adhesive composite provided by the present invention; Figure 2 A schematic diagram of the first hot melt adhesive layer is provided for this invention; Figure 3 Provided for the present invention Figure 1 An enlarged view of point A shown; Figure 4 This is a schematic diagram of a second embodiment of the nonwoven bag using hot melt adhesive lamination provided by the present invention; Figure 5 Provided for the present invention Figure 4 An enlarged view of point B shown; Figure 6 A schematic diagram of the heat-insulating functional film layer provided for this invention; Figure 7 A schematic diagram of a third embodiment of the nonwoven bag using hot melt adhesive lamination provided by the present invention; Figure 8 Provided for the present invention Figure 7 An enlarged view of point C shown; Figure 9 This is a schematic diagram illustrating the process of creating a nonwoven bag using hot melt adhesive lamination, as provided by the present invention.

[0019] Numbered in the diagram: 1. Non-woven bag body; 101. Film layer; 102. First hot melt adhesive layer; 103. Non-woven fabric layer; 104. Second hot melt adhesive layer; 105. Thermal insulation film layer; 2. Handle structure; 201. Connection point between handle and bag body; 202. Handle; 3. Sealing cap; 4. Sealing structure; 401. Protective strip; 402. Adhesive strip; 5. Non-woven fabric roll; 6. Corona treatment roller; 7. Electric... 8. Corona discharge electrode, 9. First guide roller, 10. Glue roller, 11. Pressure roller, 12. Second guide roller, 13. Glue application roller, 14. Hot melt adhesive, 15. Anilox roller, 16. Hot melt adhesive tank, 17. Press plate type hot melt adhesive machine, 18. Temperature controllable heating tube, 19. Third guide roller, 20. Film, 21. Composite material, 22. Cooling roller, 22. Side limiting assembly, 221. Connecting belt, 222. Limiting belt, 23. Placement bag. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] First Embodiment Please refer to the following: Figure 1 , Figure 2 , Figure 3 ,in, Figure 1 A schematic diagram of the first embodiment of the nonwoven bag using hot melt adhesive composite provided by the present invention; Figure 2 A schematic diagram of the first hot melt adhesive layer is provided for this invention; Figure 3 Provided for the present invention Figure 1 The enlarged view at point A is shown. The nonwoven bag using hot melt adhesive lamination and its implementation method include: a nonwoven bag body 1; Two handle structures 2 are respectively installed on the outer surface of the non-woven bag body 1; A film layer 101 is located on the outermost layer of the nonwoven bag body 1, and a first hot melt adhesive layer 102 is provided on the inner surface of the film layer 101. Non-woven fabric layer 103 is disposed on the inner surface of the first hot melt adhesive layer 102; Two handle structures 2 are located on the front and back of the nonwoven bag body 1 near the top, with their installation positions evenly aligned with the edge of the bag opening. The bonding and sewing points are evenly distributed to ensure balanced force on both sides. The film layer 101 is a smooth, wrinkle-free, pinhole-free, and undamaged functional film with a thickness controlled between 15μm and 40μm. The surface is kept clean, free of oil and dust. The first hot melt adhesive layer 102 requires continuous, uninterrupted, unpilled, and unmissed adhesive application, with consistent edge coating width and strictly controlled basis weight. The nonwoven layer 103 uses a basis weight of 40g / m². 2 -80g / m 2Before lamination, the materials must be dry, clean, free of impurities and creases. During lamination, the film layer 101, the first hot melt adhesive layer 102, and the non-woven fabric layer 103 must be completely aligned without offset, misalignment, or air bubbles. After lamination, the overall surface should be flat and sturdy, with no curling edges or wrinkles on the bag body, and no glue overflow or contamination in the handle installation area, ensuring a neat appearance and stable use of the finished product.

[0022] Please refer to Figure 1 and Figure 3 The handle structure 2 includes a handle-bag body connection point 201 and a handle 202. The handle-bag body connection point 201 is used to fix both ends of the handle 202 to the non-woven bag body 1. Both ends of the handle 202 must be straight and fit the outside of the bag body without twisting or shifting. The connection point 201 between the handle 202 and the non-woven bag body 1 is fixed at multiple points evenly, with symmetrical positions and consistent spacing. There is no glue overflow or wrinkles in the fixed area to ensure balanced force and prevent cracking or falling off during long-term lifting.

[0023] The first hot melt adhesive layer 102 is made of reactive polyurethane hot melt adhesive, the non-woven fabric layer 103 is made of PP spunbond non-woven fabric, and the film layer 101 is made of PP biaxially oriented film. The thickness of the first hot melt adhesive layer 102 is controlled between 2 μm and 5 μm, the thickness of the nonwoven fabric layer 103 is controlled between 0.15 mm and 0.30 mm, and the film layer 101 can also be made of PET film.

[0024] The working principle of the non-woven bag using hot melt adhesive lamination and its implementation method provided by this invention is as follows: The design revolves around a nonwoven bag body 1, constructing a double-layer composite structure. The nonwoven layer 103 serves as the main mechanical load-bearing structure, while the film layer 101 acts as the outer protective layer. A first hot melt adhesive layer 102 is used in between to achieve low-temperature, solvent-free bonding. This first hot melt adhesive layer 102 employs a reactive polyurethane hot melt adhesive, exhibiting excellent flowability and wettability under heating conditions of 140℃~150℃. Precise coating is achieved using a modified anilox roller coating laminator, with the adhesive application rate controlled at 2g / m². 2 ~4g / m 2 The corona treatment gives the surface energy of the nonwoven fabric layer 103 a surface energy of 36 dyne / cm, which greatly improves the interfacial bonding strength. After bonding, the adhesive layer undergoes an in-situ cross-linking reaction when it comes into contact with moisture in the air, quickly forming a three-dimensional network polymer curing structure without the need for drying in an oven. The entire composite process relies on the principle of low-temperature melting precision coating and moisture curing, avoiding fiber degradation and structural damage to the nonwoven fabric layer 103 caused by high temperature. At the same time, the ultra-thin adhesive layer achieves high-strength interfacial bonding. From the perspective of material matching and process mechanism, it solves the defects of traditional composite processes such as substrate damage, high energy consumption, large emissions, and low fastness, so that the nonwoven bag body 1 has mechanical properties, protective properties, and environmental protection attributes.

[0025] Compared with related technologies, the non-woven bag using hot melt adhesive lamination and its implementation method provided by the present invention have the following beneficial effects: The non-woven bag body 1 used in this design completely avoids damage to the non-woven layer 103 caused by high temperatures, significantly improving the bag's burst strength, seam strength, and insulation, resulting in stronger stability in use. The amount of the first hot melt adhesive layer 102 is reduced, decreasing by more than 75% compared to lamination and water-based adhesive processes, resulting in significant plastic reduction and environmental protection. The lamination temperature is lowered to 140℃~150℃, reducing core heating energy consumption by more than 90%, demonstrating significant energy-saving and carbon-reducing advantages in production. The lamination process has no VOC emissions, meeting the environmental protection requirements of high-end packaging such as food and baby products, and ensuring a safer production environment. The film layer 101 gives the bag excellent waterproof, stain-resistant, and puncture-resistant properties, making it suitable for various scenarios such as shopping, logistics, and catering. The interlayer peel strength reaches the level of substrate damage, and the handle structure 2 is firmly connected, capable of bearing 10kg without delamination or cracking. The production line speed can reach 200~400m / min, eliminating the need for drying tunnel equipment and enabling continuous large-scale production. This design achieves comprehensive optimization in product performance, environmental protection level, production efficiency, and manufacturing costs, significantly enhancing the market competitiveness of double-layer non-woven bags.

[0026] Second Embodiment Please refer to the following: Figures 4-5 - Figure 6 , Figure 4 This is a schematic diagram of a second embodiment of the nonwoven bag using hot melt adhesive lamination provided by the present invention; Figure 5 Provided for the present invention Figure 4 An enlarged view of point B shown; Figure 6 This diagram illustrates the thermal insulation film layer provided by the present invention. Based on the first embodiment of this application, which provides a nonwoven bag and its implementation method using hot melt adhesive lamination, the second embodiment of this application proposes another nonwoven bag and its implementation method using hot melt adhesive lamination. The second embodiment is merely a preferred embodiment of the first embodiment, and its implementation will not affect the separate implementation of the first embodiment.

[0027] Specifically, the difference between the nonwoven bag using hot melt adhesive lamination and its implementation method provided in the second embodiment of this application lies in the following: Please refer to... Figure 4 and Figure 6 The inner surface of the nonwoven fabric layer 103 is provided with a second hot melt adhesive layer 104, and the inner surface of the second hot melt adhesive layer 104 is provided with a heat-insulating functional film layer 105, the material of the heat-insulating functional film layer 105 being aluminum foil film. For the thermal insulation layer 105, EPE thermal insulation film can also be selected, with the thickness controlled between 20 μm and 80 μm.

[0028] Please refer to Figure 4 and Figure 5The top of the nonwoven bag body 1 is equipped with a sealing cover 3, and one side of the sealing cover 3 is equipped with a sealing structure 4. The sealing structure 4 includes a protective strip 401 and an adhesive strip 402, and the protective strip 401 and the adhesive strip 402 are attached together. The adhesive strip 402 is attached to one side of the sealing cap 3. After the protective strip 401 is torn off, the adhesive strip 402 can be used to connect one side of the sealing cap 3 to the non-woven bag body 1 to achieve the function of sealing. The sealing cap 3 is located at the top of the non-woven bag body 1 near one side.

[0029] Compared with related technologies, the non-woven bag using hot melt adhesive lamination and its implementation method provided by the present invention have the following beneficial effects: The nonwoven bag body 1 in this design features a three-layer thermal insulation composite structure. The nonwoven fabric layer 103 serves as the central mechanical support framework, the film layer 101 is the outer wear-resistant protective layer, and the thermal insulation film layer 105 is the inner heat-insulating and heat-locking layer. Both the first hot melt adhesive layer 102 and the second hot melt adhesive layer 104 utilize reactive polyurethane hot melt adhesive, which is melt-coated at a low temperature of 140℃~150℃, achieving a coating strength of 0.1 g / m³ using a textured roller coating laminating machine. 2 High-precision gluing and precise temperature control at 1℃ ensure uniform and stable two-layer adhesive. The non-woven fabric layer 103, treated with corona discharge, has a surface energy of 36 dyne / cm, which greatly improves the interfacial bonding with the film layer. The adhesive layer quickly cross-links and cures upon contact with moisture, forming a strong and irreversible adhesive interface. The overall structure adopts a sandwich structure principle of external protection, internal support, and internal insulation, completing multi-layer integrated composite under low-temperature and non-damaging conditions. It retains the independent function of each layer material and achieves high-strength interlayer bonding through double adhesive layers, avoiding problems such as substrate damage and insulation layer failure caused by high temperatures. At the same time, it forms a sealed space with the sealing cap 3 and sealing structure 4, which greatly improves the insulation effect. It solves the functional defects and production pain points of traditional insulation bags from both structural and process dimensions. This design endows the nonwoven bag body 1 with long-lasting heat preservation performance, suitable for use in environments ranging from -20℃ to 80℃. The heat preservation time is more than 3 times longer than that of ordinary bags, perfectly meeting the needs of cold chain, food delivery, and fresh food distribution. The total amount of the first hot melt adhesive layer 102 and the second hot melt adhesive layer 104 is only 4g / m³. 2 ~8g / m 2The adhesive layer is ultra-thin, lightweight, and significantly reduces plasticity. The low-temperature composite process completely avoids high-temperature damage to the non-woven fabric layer 103 and the heat-insulating film layer 105, preserving the complete functionality of the materials. The bag can bear a weight of over 15kg, has strong reusability, and the interlayer bonding strength reaches the level of substrate damage. It will not delaminate or crack after long-term use. It has excellent water resistance, oil resistance, and low-temperature resistance. Production is carried out without drying tunnels or VOC emissions, with a linear speed of 200-400m / min, enabling large-scale and efficient production. Combined with the sealing cap 3 and sealing structure 4, it achieves a sealed and heat-locking effect, further enhancing the user experience. Compared with traditional insulated bags, this structure comprehensively improves in terms of heat insulation performance, mechanical strength, environmental protection level, and production cost, driving the upgrade of non-woven bags towards multi-functionality, high-end, and scenario-based applications.

[0030] Third Embodiment Please refer to the following: Figures 7-8 , Figure 7 A schematic diagram of a third embodiment of the nonwoven bag using hot melt adhesive lamination provided by the present invention; Figure 8 Provided for the present invention Figure 7 The enlarged view at point C shows a nonwoven bag and its implementation method using hot melt adhesive lamination, based on the first embodiment of this application. The third embodiment of this application proposes another nonwoven bag and its implementation method using hot melt adhesive lamination. The third embodiment is merely a preferred embodiment of the first embodiment, and its implementation will not affect the separate implementation of the first embodiment.

[0031] Specifically, the difference between the nonwoven bag using hot melt adhesive lamination and its implementation method provided in the third embodiment of this application lies in the following: Please refer to... Figure 7 A side limiting component 22 is installed on one side of the inner wall of the nonwoven bag body 1, and a placement bag 23 is installed on one side of the inner wall of the nonwoven bag body 1. The side limiting component 22 and the placement bag 23 are made of the same material as the non-woven bag body 1, and the size of the side limiting component 22 is determined according to the required bag loading type.

[0032] Please refer to Figure 7 and Figure 8 The side limiting component 22 includes two connecting straps 221 and a limiting strap 222. The two connecting straps 221 are used to fix the two ends of the limiting strap 222 inside the non-woven bag body 1. The limiter band 222 has a certain length; it can be folded up when not in use and unfolded when needed.

[0033] Compared with related technologies, the non-woven bag using hot melt adhesive lamination and its implementation method provided by the present invention have the following beneficial effects: To facilitate the organization of small or cylindrical items inside the non-woven bag body 1, a side-limiting component 22 for inserting cylindrical items is installed on one side of the non-woven bag body 1. This component provides stable clamping and directional restraint for small cylindrical items such as water cups, umbrellas, and beverage bottles, effectively preventing them from tipping over, tilting, or leaking during carrying, walking, or transportation. This improves carrying safety and neatness. Simultaneously, a storage bag 23 is installed on one side inside the non-woven bag body 1, allowing for the unified storage of thin and small items such as tickets, cards, masks, earphones, and power banks, separating them from larger items. This allows for the categorization and quick retrieval of large and small items, cylindrical and thin items, without occupying the main storage space of the non-woven bag body 1 or affecting the normal placement of larger items. This significantly improves the space utilization and convenience of the non-woven bag, making items more organized and efficient to use during daily shopping, commuting, and outings, resulting in a significantly enhanced overall practicality and user experience.

[0034] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A nonwoven bag laminated with hot melt adhesive, characterized in that, include: Non-woven bag body; A handle structure is installed on the outer surface of the nonwoven bag body; A film layer, the film layer being located on the outermost layer of the nonwoven bag body, and a first hot melt adhesive layer being provided on the inner surface of the film layer; A nonwoven fabric layer is disposed on the inner surface of the first hot melt adhesive layer.

2. The nonwoven bag using hot melt adhesive lamination according to claim 1, characterized in that, The handle structure includes a handle-to-bag body connection point and a handle, wherein the handle-to-bag body connection point is used to fix both ends of the handle to the non-woven bag body.

3. The nonwoven bag using hot melt adhesive lamination according to claim 1, characterized in that, The first hot melt adhesive layer is made of reactive polyurethane hot melt adhesive, the non-woven fabric layer is made of PP spunbond non-woven fabric, and the film layer is made of PP biaxially oriented film.

4. The nonwoven bag using hot melt adhesive lamination according to claim 1, characterized in that, The inner surface of the nonwoven fabric layer is provided with a second hot melt adhesive layer, and the inner surface of the second hot melt adhesive layer is provided with a heat-insulating film layer, the material of which is aluminum foil film.

5. The nonwoven bag using hot melt adhesive lamination according to claim 1, characterized in that, The top of the nonwoven bag body is fitted with a sealing cap, and one side of the sealing cap is fitted with a sealing structure, which includes a protective strip and an adhesive strip, and the protective strip and the adhesive strip are attached together.

6. The nonwoven bag using hot melt adhesive lamination according to claim 1, characterized in that, A side limiting component is installed on one side of the inner wall of the nonwoven bag body, and a placement bag is installed on one side of the inner wall of the nonwoven bag body.

7. The nonwoven bag using hot melt adhesive lamination according to claim 6, characterized in that, The side limiting assembly includes a connecting strap and a limiting strap, wherein the connecting strap is used to fix both ends of the limiting strap inside the nonwoven bag body.

8. A method for producing a nonwoven bag using hot melt adhesive lamination, characterized in that, This includes nonwoven bags laminated with hot melt adhesive as described in any one of claims 1-7. The realization of these nonwoven bags requires a method for achieving hot melt adhesive lamination, comprising the following steps: S1: First, complete the selection, modification, and preparation of raw and auxiliary materials. Select the anilox roller coating laminating machine as the core production equipment. Add a corona treatment device and a pressure plate hot melt adhesive supply device to the equipment. The corona treatment device includes a corona treatment roller and a corona discharge electrode. The pressure plate hot melt adhesive supply device includes a pressure plate hot melt adhesive machine and a temperature-controlled heating tube. At the same time, use auxiliary structures such as the first guide roller, the second guide roller, the third guide roller, and the cooling roller. Select hot melt adhesive as the special composite adhesive. Prepare non-woven fabric rolls, films, and heat-insulating functional film layers for making thermal bags. Ensure that the equipment and materials meet the requirements of hot melt adhesive lamination production. After modification, the equipment can be adapted to the needs of closed heating, constant temperature conveying, intermittent quantitative coating, and continuous lamination production. S2: The nonwoven fabric roll and the film are smoothly released through the unwinding mechanism. The two substrates are sequentially guided and smoothed by the first guide roller, the second guide roller, and the third guide roller to ensure that there are no wrinkles, no deviation, and uniform tension during the substrate conveying process. The composite surface of the nonwoven fabric is corona activated by the high voltage electric field between the corona treatment roller and the corona discharge electrode. The plasma generated by the high frequency and high voltage discharge ionizes the air and bombards the surface of the nonwoven fabric to achieve physical roughening and chemical modification, implant polar groups and improve surface wettability, significantly improving the surface activity of the substrate and the subsequent bonding strength. S3: Solid hot melt adhesive is placed inside the pressure plate type hot melt adhesive machine for sealed heating. The pressure plate presses down to melt only the surface layer of adhesive, achieving instant melting for use and effectively preventing adhesive aging and carbonization. The molten adhesive is then transported to the anilox roller, where the engraved dots on the roller surface are used to coat the adhesive completely and evenly onto the film surface. The adhesive flow remains stable throughout the process, with no back-condensation, no overflow, and no missed coating. S4: The coated film and the corona-treated nonwoven fabric are simultaneously introduced into the composite area between the pressure roller and the glue roller. Under constant temperature and appropriate mechanical pressure, hot-pressing is performed. The pressure removes the air between the two substrates, allowing the adhesive to fully wet the pores of the nonwoven fabric and penetrate into the microscopic surface of the film, forming a dual combination structure of molecular attraction and mechanical interlocking. After the composite is completed, the material is immediately cooled by forced air cooling or water cooling through the cooling roller, which allows the hot melt adhesive to quickly change from liquid to solid and lock the bonding strength. Finally, the winding structure smoothly winds up the formed composite material with constant tension, ensuring that the winding end face is neat and without any tightness difference. S5: Place the finished composite material roll at room temperature for full curing treatment, so that the hot melt adhesive can fully undergo a moisture curing reaction, allowing the adhesive's bonding performance, weather resistance, and water resistance to reach the optimal stable state. This ensures that the composite roll can meet the performance requirements of various usage scenarios such as shopping, logistics, catering, and cold chain logistics, and avoids problems such as delamination, insufficient peel strength, and delamination. S6: The matured composite material is precisely cut to the required size of the bag body. The handle is installed by welding or sewing and the connection point between the handle and the bag body is firmly fixed to form a double-layer composite non-woven bag with a film layer, a hot melt adhesive layer, and a non-woven fabric layer. If a three-layer composite heat-insulating non-woven bag is to be made, the film layer, hot melt adhesive layer, non-woven fabric layer, hot melt adhesive layer and heat-insulating film layer are laminated in sequence. After cutting and shaping, a sealing device and sealing cap are added to complete the entire production process of the heat-insulating non-woven bag. The finished product has high composite strength, good heat insulation, burst strength and tear resistance.

9. The method for realizing a nonwoven bag using hot melt adhesive lamination according to claim 8, characterized in that, The coating amount control accuracy of the S1 anilox roller coating laminator is 0.1 g / m. 2 The machine has a total power of 25kW / unit, a tension control accuracy of 1N, and an operating speed of 200-400m / min; the heating power of the pressure plate type hot melt adhesive machine is 5KW, the temperature control accuracy is 1℃, and the average core heating energy consumption is 0.4kJ / m. 2 In S2, the surface energy of the nonwoven fabric after being treated by a corona treatment roller and a corona discharge electrode is 36 dyne / cm. The corona treatment achieves surface micro-roughening and polar group implantation through high-voltage plasma bombardment.

10. The method for realizing a nonwoven bag using hot melt adhesive lamination according to claim 8, characterized in that, The heating temperature of the hot melt adhesive in S3 is 140℃~150℃, and the amount of adhesive applied is stably controlled at 2~4g / m². 2 In S4, the hot pressing temperature of the pressure roller is controlled at 100~110℃, the composite pressure is 0.2-2.0MPa, and the cooling roller adopts air cooling or water cooling to achieve rapid curing and shaping.

Images