Composite pine wood nematode disease epidemic wood treatment bag and pine wood nematode disease epidemic wood on-site pest removal treatment method

Abstract

The invention relates to a composite bursaphelenchus xylophilus epidemic wood treatment bag and a bursaphelenchus xylophilus epidemic wood on-site disinfestation treatment method.The film body of the composite bursaphelenchus xylophilus epidemic wood treatment bag is of a five-layer composite structure, and the five-layer composite structure sequentially comprises an aluminum film layer, a first PE film layer, a polypropylene woven cloth film layer, a second PE film layer and a third PE film layer from outside to inside; the thickness of the aluminum film layer is 0.02 mm, the thickness of the polypropylene woven cloth film layer is 0.05 mm, the warp and weft density is 120 * 120 pieces per inch, and each piece of warp and weft is a rectangular flat filament; the thickness of each of the first PE film layer, the second PE film layer and the third PE film layer is 0.02 mm, the surface of the first PE film layer is subjected to corona treatment, the surface tension is larger than or equal to 38 mN / m, the third PE film layer is a sealed contact layer, the composite epidemic wood treatment bag and the treatment method can achieve full-scene on-site efficient pest removal of pine wood nematode disease epidemic wood, the prevention and control cost is reduced, and the prevention and control effect is improved.

Description

Technical Field

[0001] This invention relates to a method for on-site treatment of pine wilt disease-infected timber, and more particularly to a composite bag for treating pine wilt disease-infected timber and a method for on-site treatment of pine wilt disease-infected timber. Background Technology

[0002] Pine wilt disease is the number one quarantine disease in my country's forestry industry. Its vector is the pine sawyer beetle. Timely and thorough eradication of infected trees is the core and crucial link in preventing the spread of the disease. However, existing technologies for treating infected trees have many insurmountable industry pain points, severely restricting the effectiveness of control measures.

[0003] 1. The transportation of infected trees is a major challenge: Most infected trees are located in forest areas with steep mountains and rugged terrain, making transportation difficult. Transporting infected trees down the mountain requires a lot of manpower and resources, resulting in extremely low efficiency and high costs.

[0004] 2. Traditional burning methods have significant limitations: centralized burning of infected wood requires a strict fire permit process (which is cumbersome and time-consuming) and is subject to strict seasonal restrictions (such as a complete ban on fire during the forest fire prevention period). In addition, the burning process poses a significant safety risk of "fire runaway" and causing forest fires.

[0005] 3. Existing fumigation bags have obvious performance defects: The commonly used 0.08mm thick ordinary plastic fumigation bags have poor puncture resistance and low tensile strength. In mountainous operations, they are easily damaged by branches and stones. Moreover, the sealing structure is simple and the sealing is unreliable. After the bag is damaged, it cannot kill the pine sawyer beetle, the vector of disease transmission in the infected wood, resulting in unstable pest control effect and failing to meet the core requirement of on-site pest control. Summary of the Invention

[0006] This invention aims to address the shortcomings of existing technologies by providing a composite diseased wood treatment bag and its supporting treatment method that features excellent puncture resistance, reliable sealing, convenient operation, and is not limited by location or season. This composite diseased wood treatment bag and its supporting treatment method can solve industry pain points such as the inability to transport diseased wood from mountainous and steep areas, the approval and seasonal restrictions on traditional burning, and the easy breakage and leakage of existing fumigation bags. It enables efficient on-site pest control of pine wilt disease-infected wood in all scenarios, reduces control costs, and improves control effectiveness.

[0007] The technical solution of the present invention is as follows:

[0008] A composite bag for treating pine wilt disease-infected wood, characterized in that the bag's membrane has a five-layer composite structure, consisting of an aluminum film layer, a first PE film layer, a polypropylene woven fabric film layer, a second PE film layer, and a third PE film layer from the outside in; the aluminum film layer is 0.02 mm thick and made of aluminum foil; the polypropylene woven fabric film layer is 0.05 mm thick, with a warp and weft density of 120×120 threads / inch, each warp and weft thread being a rectangular flat filament; each of the first, second, and third PE film layers is 0.02 mm thick and made of low-density polyethylene; the surface of the first PE film layer is corona-treated, with a surface tension ≥38 mN / m, used to enhance the adhesion to the polypropylene woven fabric film layer; the third PE film layer is a sealing contact layer, with a smooth surface and excellent heat-melting properties, suitable for hot-press sealing processes.

[0009] 2. The composite pine wilt disease-infected wood treatment bag according to claim 1, characterized in that the overall thickness of the membrane is 0.13mm, the interlayer composite strength is ≥3N / 15mm, the tensile strength is ≥58.05N / mm², and the puncture resistance is ≥17.7N.

[0010] Preferably, the above-mentioned treatment bag has a rectangular semi-open structure, with a length of 1.8m, a width of 1.5m, and an effective volume of 0.3-0.4 cubic meters. The bag body is made of two identical rectangular composite films, and the three sides of the two identical rectangular composite films are heat-pressed, with a width of 2cm for the three sides. A "destructive adhesive layer" is pre-applied to the inside of the bag opening to provide basic adhesion for subsequent sealing and reduce the difficulty of mountain operations.

[0011] Preferably, the above-mentioned treatment bag adopts a combined sealing structure: the bottom and two sides of the bag body are sealed by heat pressing, with a heat pressing temperature of 140℃, a pressure of 0.5MPa, a heat pressing time of 8s, a sealing width of 2cm, and a sealing strength of ≥50N / 15mm; the bag opening adopts a final sealing structure by breaking the initial adhesive layer and bonding it with a 5-6cm wide transparent tape folded in half.

[0012] The present invention relates to a method for on-site treatment of pine wilt-infected timber, characterized by the use of the aforementioned composite pine wilt-infected timber treatment bag, comprising the following steps:

[0013] (1) Cut the infected trees into 1.2m long sections at the site where the infected trees were distributed;

[0014] (2) Fill the treatment bag with 10-15 pieces of infected wood and add aluminum phosphide fumigant at the same time;

[0015] (3) Use the damaged adhesive layer inside the bag opening for initial bonding and fixing, and then use transparent tape folded in half to cover the entire sealing surface for final sealing;

[0016] (4) Stack the sealed treatment bags on the spot and let them stand for 15-20 days to complete the treatment of diseased wood.

[0017] Preferably, the above treatment method is applicable to mountainous forest areas with a slope of ≤35° and a temperature range of -10℃ to 40℃, without the need for transporting infected timber down the mountain or using fire.

[0018] Significant advantages of this invention:

[0019] 1. Completely solves the problem of easily broken bags: In the 5-layer composite membrane structure, the polypropylene woven fabric membrane layer works synergistically with the other layers, and the puncture resistance is 7.2 times that of traditional ordinary fumigation bags, and the tensile strength is increased by 12.6 times. In mountainous operations, the risk of bag breakage is completely avoided, ensuring the sealing foundation.

[0020] 2. Overcoming location limitations: Suitable for remote forest areas with high mountains and steep roads that are inaccessible by vehicles, enabling on-site bagging and pest control of infected timber without the need for transporting it down the mountain, significantly reducing labor and transportation costs (overall labor and transportation costs are reduced by more than 70%).

[0021] 3. Eliminate seasonal and approval restrictions: No fire is required for operation, and it is not affected by forest fire prevention periods or seasonal temperatures (it can be used stably from -10℃ to 40℃). At the same time, it avoids the cumbersome process of fire approval and the safety risk of "fire running", enabling year-round normalized operation.

[0022] 4. Reliable sealing and stable pest control effect: The combined sealing scheme ensures the airtightness of the bag. Multi-region and multi-environment experiments have verified that the mortality rate of pine sawyer beetle larvae reaches 100% after 20 days of sealing, completely blocking the transmission path of pine wilt nematode.

[0023] 5. Controllable cost and excellent economic efficiency: The raw material cost of the 5-layer composite film is only about 15 yuan more than that of the existing ordinary fumigation bag. However, due to the elimination of costs for transportation, centralized processing, and fire approval, the overall prevention and control cost is reduced by more than 200 yuan compared with the existing method of bringing epidemic wood down the mountain or burning it. It is easy to promote and apply on a large scale. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is the front view of the infected wood treatment bag;

[0026] Figure 2 This is a schematic diagram of a 5-layer composite membrane structure. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] The diseased wood treatment bag of this invention achieves synergistic optimization of performance and operation through the directional design of a 5-layer composite membrane structure, precise manufacturing process, and a combination sealing scheme adapted to mountainous terrain. Specific technical features are as follows:

[0029] 1. Layered structure and function of composite membranes (5-layer composite system):

[0030] The treatment bag's membrane is composed of five layers sequentially: an aluminum film layer, a first PE film layer, a polypropylene (PP) woven fabric film layer, a second PE film layer, and a third PE film layer. The parameters and functions of each layer are precisely matched to the needs of controlling pests on infected trees in mountainous areas, with a core design goal emphasizing puncture resistance and a strong seal.

[0031] Aluminum film layer: 0.02mm thick, made of food-grade aluminum foil, its core function is to increase the tensile strength and rigidity of the composite film;

[0032] PP woven fabric film layer: 0.05mm thick, warp and weft density 120×120 threads / inch, each warp and weft is a rectangular flat yarn, which is the "puncture-resistant core layer". Combined with the toughness of the aluminum film layer and the cushioning of the PE film layer, it greatly improves the tensile strength and tear resistance of the bag, ensuring that it can withstand the scratches of tree branches, sharp branches or other object impacts in mountainous environments.

[0033] PE film layers (3 layers, including a first PE film layer, a second PE film layer, and a third PE film layer): each layer is 0.02mm thick, made of low-density polyethylene (LDPE), and has a clear functional division:

[0034] First PE film layer: The surface is corona treated (surface tension ≥38mN / m), serving as a "composite adhesive layer" to enhance the adhesion to the PP woven fabric film layer and prevent delamination between layers;

[0035] Second PE film layer: Reinforced adhesive layer, increases the thickness and cushioning of the bag, absorbs external impact during mountain operations, further prevents delamination between layers and improves the bag's resistance to damage;

[0036] The third PE film layer: as a "sealing contact layer", it has a smooth surface and excellent heat melt properties, making it suitable for hot-press sealing processes and ensuring sealing reliability.

[0037] The composite film has an overall thickness of 0.13mm (13 mils), an interlayer bonding strength of ≥3N / 15mm, no risk of delamination, and its overall performance far exceeds that of existing ordinary fumigation bags.

[0038] 2. Bag structure design for processing bags:

[0039] The bag adopts a rectangular semi-open structure, which is suitable for the rapid filling of diseased wood (segments / logs) in mountainous areas. The specific design is as follows:

[0040] Basic dimensions: 1.8m long × 1.5m wide, effective volume 0.3-0.4 cubic meters, can be filled with 10-15 sections of infected wood with a diameter of 15-20cm, meeting the manpower adaptability for single-bag operation in mountainous areas;

[0041] The bag is made of two identical rectangular composite films. The three sides (bottom and two side sides) of the two identical rectangular composite films are heat-pressed, and the width of the heat-pressed three sides is 2cm.

[0042] Bag opening design: The top (fourth side) of the bag body is the bag opening, and the inside of the bag opening is pre-applied with a "destructive adhesive layer" (2cm wide, made of OPP, PE or PET (Mylar) and other base materials) to provide basic adhesion for subsequent sealing and reduce the difficulty of mountain operation.

[0043] 3. Mountain-adaptable combination sealing solution (three-sided heat pressing + bag opening rupture adhesive + transparent tape folded and sealed):

[0044] The combined sealing solution of "pre-sealing + final sealing" eliminates the need for large equipment, making it suitable for mountainous environments with no power supply and limited operating space, ensuring reliable sealing.

[0045] Three-sided pre-sealing: The bottom and two sides of the bag are sealed by hot-pressing. The hot-pressing temperature is 140℃, the pressure is 0.5MPa, the hot-pressing time is 8s, the sealing width is 2cm, and the sealing strength after hot-pressing is ≥50N / 15mm, which achieves preliminary sealing and prevents air leakage from the sides and bottom of the bag.

[0046] Final sealing of the bag opening: After the infected wood is filled, the pre-applied adhesive layer is used to achieve initial bonding and fixation; then, a layer of 5-6cm wide transparent tape is applied to the folded area (referring to the folded area of ​​the tape) (specifically, 2-3cm of the 5-6cm wide transparent tape is applied to one side of the bag opening, and the remaining 2-3cm wide tape is folded in half and applied to the other side of the bag opening), covering the entire folded sealing surface to achieve a secondary final seal and ensure the pest control effect.

[0047] The following are some examples of using the diseased wood treatment bags and treatment methods of the present invention.

[0048] Example 1: Nanping Wuyishan Experimental Site

[0049] Experimental location: Mountainous area of ​​*Phytophthora indicum* distribution area, Xingcun Town, Wuyishan City, Nanping City (slope 35°, steep mountain roads, inaccessible by vehicle);

[0050] Experiment time: September 2024;

[0051] Experimental materials: 30 composite diseased wood treatment bags of this invention, and pine wood segments infected with pine wilt disease with a diameter of 18-30cm;

[0052] Operation process: 1. Manually cut the infected wood into 1.2m long sections on site; 2. Fill each bag with 12-15 sections of infected wood (0.3-0.4 cubic meters in volume), and then put aluminum phosphide fumigant inside; 3. Use pre-applied adhesive for initial bonding, and then fold it in half with 6cm transparent tape for final sealing; 4. After sealing, stack them on site and let them stand for treatment.

[0053] Experimental results: After being sealed for 15 days, none of the 30 treatment bags were damaged, and the mortality rate of pine sawyer beetle larvae on the infected wood inside the bags was 100%; the experiment did not require the use of fire, thus avoiding the restrictions on burning during the forest fire prevention period and the risk of fire.

[0054] Example 2: Ningde Shouning Experimental Site

[0055] Experimental location: Complex terrain of the diseased wood area in Xiadang Township, Shouning County, Ningde City (dense gravel and thorns, rugged terrain).

[0056] Experiment time: August 2025;

[0057] Experimental materials: 40 composite diseased wood treatment bags of this invention, and pine wood segments infected with pine wilt disease with a diameter of 15-30cm;

[0058] Operation procedure: Same as in Example 1;

[0059] Experimental results: After 20 days of sealing, the 40 treatment bags remained intact and undamaged, and the mortality rate of pine sawyer beetle larvae inside the infected wood was 100%. The treatment bags were resistant to the humid environment of the rainy season and scratches from thorns, and their puncture resistance and sealing performance were stable.

[0060] Example 3: Sanming Jiangle Experimental Site

[0061] Experimental location: remote, mountainous, and disease-prone area in Bailian Town, Jianle County, Sanming City;

[0062] Experimental period: December 2025;

[0063] Experimental materials: 30 composite diseased wood treatment bags of this invention, and pine wood segments infected with pine wilt disease with a diameter of 16-30cm;

[0064] Operation procedure: Same as in Example 1;

[0065] Experimental results: After 20 days of sealing, the performance of the 30 treatment bags remained stable and undamaged, and the mortality rate of pine sawyer beetle larvae inside the infected wood was 100%; there was no need to transport the infected wood down the mountain, which greatly reduced labor costs, and the sealing performance was not affected under low temperature conditions.

[0066] Summary of experimental data from multiple regions

[0067] Experimental site Number of experimental bags Packing quantity per bag of infected wood Experimental environmental conditions Processing time Mortality rate of pine sawyer beetle larvae Damaged bags Nanping Wuyishan 30 bags 0.3-0.4 cubic meters High mountains and steep roads 15 days 100% 0 bags damaged Ningde Shouning 40 bags 0.3-0.4 cubic meters gravel and thorns 20 days 100% 0 bags damaged Sanming Jiang Le 30 bags 0.3-0.4 cubic meters Remote forest area + low winter temperatures 20 days 100% 0 bags damaged

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are permitted.

Claims

1. A composite bag for treating pine wood infected with pine wilt disease, characterized in that, The processing bag has a 5-layer composite structure, consisting of an aluminum foil layer, a first PE foil layer, a polypropylene woven fabric foil layer, a second PE foil layer, and a third PE foil layer from the outside in. The aluminum foil layer is 0.02 mm thick and made of aluminum foil. The polypropylene woven fabric foil layer is 0.05 mm thick, with a warp and weft density of 120 × 120 threads / inch, and each warp and weft thread is a rectangular flat filament. The first, second, and third PE foil layers are each 0.02 mm thick and made of low-density polyethylene. The surface of the first PE foil layer is corona-treated, with a surface tension ≥38 mN / m, to enhance the adhesion to the polypropylene woven fabric foil layer. The third PE foil layer is a sealing contact layer with a smooth surface and excellent heat-melting properties, suitable for hot-press sealing processes.

2. The composite pine wilt disease-infected wood treatment bag according to claim 1, characterized in that, The overall thickness of the membrane is 0.13 mm, the interlayer bonding strength is ≥3 N / 15 mm, the tensile strength is ≥58.05 N / mm², and the puncture resistance is ≥17.7 N.

3. The composite pine wilt disease-infected wood treatment bag according to claim 1, characterized in that, The treatment bag has a rectangular semi-open structure, measuring 1.8m in length and 1.5m in width, with an effective volume of 0.3-0.4 cubic meters. The bag body is made of two identical rectangular composite films, with three sides of the two identical rectangular composite films heat-pressed together, the width of which is 2cm. A "destructive adhesive layer" is pre-applied to the inside of the bag opening to provide basic adhesion for subsequent sealing and reduce the difficulty of mountain operations.

4. The composite pine wilt disease-infected wood treatment bag according to claim 1, characterized in that, The treatment bag adopts a combined sealing structure: the bottom and two sides of the bag are sealed by heat pressing at a temperature of 140℃, a pressure of 0.5MPa, a heat pressing time of 8s, a sealing width of 2cm, and a sealing strength of ≥50N / 15mm; the bag opening adopts a final sealing structure that breaks the adhesive layer for initial adhesion and is then folded and pasted with a 5-6cm wide transparent tape.

5. A method for on-site treatment of pine wilt-infected timber, characterized in that, The composite pine wilt disease-infected wood treatment bag according to any one of claims 1-4 includes the following steps: (1) Cut the infected trees into 1.2m long sections at the site where the infected trees were distributed; (2) Fill the treatment bag with 10-15 pieces of infected wood and add aluminum phosphide fumigant at the same time; (3) Use the damaged adhesive layer inside the bag opening for initial bonding and fixing, and then use transparent tape folded in half to cover the entire sealing surface for final sealing; (4) Stack the sealed treatment bags on the spot and let them stand for 15-20 days to complete the treatment of diseased wood.

6. The method for on-site treatment of pine wilt-infected timber according to claim 5, characterized in that, The treatment method is applicable to mountainous forest areas with a slope of ≤35° and a temperature range of -10℃ to 40℃. It does not require the transport of infected timber down the mountain or the use of fire.

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