Preparation method of Chinese terminalia fruit wood pulp fibers, moisture absorption core body and agricultural greenhouse moisture absorption equipment

Abstract

The invention provides a preparation method of terminalia parvifolia wood pulp fibers, a moisture absorption core body and agricultural greenhouse moisture absorption equipment. The preparation method comprises the following steps: step 1, collecting terminalia parvifolia plants, and crushing the collected terminalia parvifolia plants into wood chips; 2, the wood chips are placed under saturated steam, pressure maintaining is carried out for set time, pressure relief is carried out, and explosion is completed; step 3, diluting the obtained blasting product with water according to a set solid-to-liquid ratio, adjusting the pH value to a range suitable for cellulase action, adding a catalytic effective amount of cellulase, stirring at a set temperature, and carrying out enzymolysis; 4, grinding the pulp subjected to enzymolysis to obtain wood pulp fibers; step 5, extracting and compounding antibacterial components: extracting the antibacterial active components from a terminalia hancei plant, and mixing and dipping the antibacterial active components with the wet fibers to enable the antibacterial components to be adsorbed on the surfaces of the fibers; step 6, freeze drying: performing pre-freezing and sublimation drying to obtain the Terminalia hance wood pulp fibers. The method has the beneficial effects that the maintenance time and the material replacement cost are greatly reduced, and the long-period dehumidification requirement of the greenhouse is met.

Description

Technical Field

[0001] This invention relates to the field of agricultural facility environmental control technology, and in particular to a method for preparing small-leaved almond wood pulp fiber, a moisture-absorbing core, and a moisture-absorbing device for agricultural greenhouses. Background Technology

[0002] In greenhouse production in southern my country, the "return to spring" season often brings extreme high humidity environments with outdoor relative humidity exceeding 90%. Even with all ventilation openings open, humid outdoor air continues to flood into the greenhouse, resulting in persistently high humidity, prolonged condensation on crop leaves, and a significantly increased incidence of airborne diseases such as gray mold and downy mildew, leading to substantial yield losses. To alleviate this problem, three main dehumidification methods are currently used in production: First, industrial dehumidifiers, while effective, cost over 1,000 yuan per mu (approximately 0.16 acres) annually in electricity, requiring 380V power and dedicated personnel, making them a high-investment, noisy option for small-scale farmers. Second, chemical desiccants such as calcium chloride and silica gel, which must be replaced after absorbing moisture, costing approximately 120 yuan per mu per week in material and labor costs. Furthermore, calcium chloride leachate can cause soil salinization, failing to meet the requirements of green agriculture. Third, increasing ventilation, but during the "return to spring" season, outdoor humidity is almost the same as indoor humidity, and continuous ventilation not only fails to reduce humidity but also introduces large amounts of pathogenic spores, creating a vicious cycle. Therefore, existing technologies cannot simultaneously meet the demands of "zero energy consumption, low cost, recyclability, and pollution-free operation," and high humidity-related diseases remain a core bottleneck restricting increased production and income in southern facility agriculture. Summary of the Invention

[0003] To address the problems in the prior art, this invention provides a method for preparing small-leaved terminalia wood pulp fiber, comprising: Step 1, Raw material collection and pretreatment: Collect small-leaved Terminalia catappa plants and crush them into wood chips; Step 2, Steam Explosion: Place the wood chips under saturated steam and maintain the pressure for a set time, then release the pressure to complete the explosion; Step 3, enzymatic hydrolysis: Dilute the explosive product obtained in step 2 with water according to the set solid-liquid ratio, adjust the pH to a range suitable for cellulase activity, add an effective amount of cellulase, and stir and enzymatically hydrolyze at the set temperature; Step 4, high-consistency pulping: The enzymatically hydrolyzed pulp is pulped to obtain wood pulp fibers with a set freeness and a set weighted average fiber length. Step 5, Antibacterial component extraction and compounding: Extract antibacterial active components from small-leaved terminalia plants and mix and impregnate them with the wet fibers obtained in step 4, so that the antibacterial components are adsorbed on the fiber surface. Step 6, freeze drying: The fibers impregnated in step 5 are pre-frozen and sublimated to obtain the desired small-leaved almond wood pulp fibers.

[0004] As a further improvement of the present invention, in step 1, the small-leaved terminalia plant is washed, cut into sections, and then crushed into 20-40 mesh wood chips using a hammer mill. In step 2, the wood chips are placed under saturated steam at 1.5-2.0 MPa for 4-8 minutes. In step 3, the explosive material is diluted with water at a solid-liquid ratio of 1:8 (w / w), the pH is adjusted to 4.5-5.5, 5 U / g of cellulase (based on oven-dried wood chips) is added, and enzymatic hydrolysis is carried out for 1-3 hours at a temperature of 40-50℃ and a stirring temperature of 130-170 r / min. In step 4, the enzymatically hydrolyzed pulp is washed until neutral and fed into a double-disc mill with a disc gap of 0.1-0.2 mm. The mill is circulated 2-4 times to obtain wood pulp fibers with a freeness of 40-50°SR and a weighted average fiber length of 0.6-0.9 mm.

[0005] In step 5, branches of the small-leaved terminalia plant are taken and extracted with 70% (v / v) ethanol at a material-to-liquid ratio of 1:12 at 50 ℃-70 ℃ for 80-100 min. The extract is then concentrated under vacuum to a solid content of 30%, yielding an antibacterial concentrate containing 12.5 mg / g of cork ketone and 3.2 mg / g of squalene. The wet fibers obtained in step 4 are mixed with the antibacterial concentrate at a mass ratio of 1:0.2 and impregnated under vacuum at 0.06-0.1 MPa for 20-40 min, allowing the antibacterial components to be adsorbed onto the fiber surface. In step 6, the fibers impregnated in step 5 are pre-frozen at -45~-55℃ for 240-270 min, and then sublimated and dried for 24-25 h to obtain small-leaved Terminalia catappa wood pulp fibers with a specific surface area of ​​4.5-6.5 m² / g, moisture absorption of 14-16 g / g (25 ℃, RH90 %), and an inhibition zone diameter of 17-20 mm against Klebsiella pneumoniae.

[0006] The present invention also discloses a moisture-absorbing core, which is a honeycomb structure with multiple pore units formed by interweaving small-leaf almond wood pulp fibers as described in the present invention.

[0007] As a further improvement of the present invention, the density of the moisture-absorbing core is 110-140 kg m³. -3 The compressive strength is 0.35-0.55 MPa, and the porosity is 80-85%; the pore size of the pore unit is 28-32 mm, and the extension depth H in the thickness direction of the moisture-absorbing core is 50 mm.

[0008] As a further improvement of the present invention, the outer surface of the moisture-absorbing core is covered with an encapsulation sleeve made of biodegradable non-woven fabric.

[0009] As a further improvement of the present invention, the edge of the encapsulation sleeve is fixed to the moisture-absorbing core, and a portion of the encapsulation sleeve extends to form a lifting handle.

[0010] The present invention also discloses a moisture-absorbing device for agricultural greenhouses, including the moisture-absorbing core described in the present invention and a fixing device for installing the moisture-absorbing core.

[0011] As a further improvement of the present invention, the fixing device includes a hollow frame, the moisture-absorbing core is installed in the hollow area of ​​the frame, and the moisture-absorbing core and the frame constitute a first moisture-absorbing unit.

[0012] As a further improvement of the present invention, there are multiple first moisture-absorbing units, which are assembled into one unit through a movable connection; the hollow frame is provided with at least one first mounting hole, and a first screw passes through the first mounting hole to fix the edge area of ​​the moisture-absorbing core to the frame; the side of the frame is provided with a second mounting hole for installing a hinge, and two adjacent first moisture-absorbing units are assembled into one unit through the hinge; the agricultural greenhouse moisture-absorbing device also includes casters, which are installed on the frame; the frame is made of PP plastic.

[0013] As a further improvement of the present invention, the fixing device includes a bracket, and the front and back sides of the top and bottom ends of the bracket are respectively provided with a nesting groove and a filling groove. The nesting groove is used to nest the agricultural greenhouse moisture absorption device on the air inlet end plate of the circulating fan, and the filling groove is used to fix the moisture absorption core. The nesting groove and the filling groove are L-shaped. The bracket is made of PP plastic.

[0014] The beneficial effects of this invention are: 1. The agricultural greenhouse dehumidification equipment uses a honeycomb core made of small-leaf almond wood pulp fiber. As long as there is airflow circulation inside the greenhouse, the core can continuously absorb moisture from the air. The entire dehumidification process requires no additional electricity. The only energy consumption option is the original circulating fan. The system operates with zero power consumption, significantly reducing the greenhouse dehumidification's dependence on electricity and electricity costs; 2. The equipment core uses a combination structure of "lifting handle - folding outer frame". A single person can complete the four-step operation of unlocking, extraction, squeezing and dehydration, and reinstallation within 1 minute, achieving more than 50 cycles of regeneration. The annual investment per acre is only 300 yuan, greatly reducing maintenance time and material replacement costs, and meeting the high-frequency, long-cycle dehumidification needs of greenhouses. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the Type I vertical agricultural greenhouse moisture absorption device of the present invention; Figure 2 This is a structural diagram of the nested moisture-absorbing device of the present invention (Type II); Figure 3This is a structural diagram of the moisture-absorbing core of the present invention. Detailed Implementation

[0016] This invention discloses a method for preparing small-leaved terminalia wood pulp fiber 12, comprising: Step 1, Raw material collection and pretreatment: Collect Terminalia neotaliala plants, wash and cut them into sections, and then crush them into wood chips; the Terminalia neotaliala plants are washed with a drum washing machine to remove mud and sand, cut into sections 3-5cm in length, and then crushed into 20-40 mesh wood chips using a hammer mill. The primary materials collected are the branches, bark, leaves, and kernels of the small-leaved terminalia (Terminalia catappa) plant. Using branches and bark is preferred, followed by leaves and kernels. The advantages of using branches and bark are: branches have a high degree of lignification, rich cellulose content, and are widely available, such as waste from urban greening pruning, thinning from artificial forest regeneration, nursery trunk cutting, and branches from shaping and replanting. Especially valuable are discarded branches from landscaping pruning, which can be recycled and reused. Bark is rich in fiber and its fibers are flexible, serving as auxiliary fibers to enhance the flexibility and compressive strength of the material, thus extending its service life. Leaves and kernels, on the other hand, have lower cellulose content and more impurities. Using them as raw materials is feasible because they are abundant and can be recycled, generating certain environmental and economic benefits.

[0017] Step 2, Steam explosion: Place the wood chips under saturated steam at 1.5-2.0 MPa for 4-8 minutes, preferably 6 minutes, and then release the pressure instantly to complete the explosion; Step 3, enzymatic hydrolysis: The explosive biomass obtained in step 2 is diluted with water at a solid-liquid ratio of 1:8 (w / w), and the pH is adjusted to 4.5-5.5, preferably 4.8. Cellulase 5 U / g (based on oven-dried wood chips) is added, and enzymatic hydrolysis is carried out at 40-50℃ (preferably 45℃) and 130-170 (preferably 150) r / min for 1-3 h, preferably 2 h. Step 4, high-consistency pulping: The enzymatically hydrolyzed pulp is pulped to obtain wood pulp fibers with a set freeness and a set weighted average fiber length. Specifically: The enzymatically hydrolyzed pulp is washed until neutral and then fed into a double-disc mill with a disc gap of 0.1-0.2 mm (preferably 0.15 mm) for 2-4 cycles (preferably 3 cycles) to obtain wood pulp fibers with a freeness of 40-50°SR (preferably 45°SR) and a weighted average fiber length of 0.78 mm. Washing the enzymatically hydrolyzed slurry to neutrality refers to the process of adding water, stirring, and separating the waste liquid after the enzymatic hydrolysis reaction is completed. This process is repeated several times until the pH value of the aqueous phase of the slurry (i.e., the washed water) reaches about 7.0, which is neutral.

[0018] Step 5, Antibacterial component extraction and compounding: Extract antibacterial active components from the small-leaved terminalia plant and mix and impregnate them with the wet fibers obtained in step 4, so that the antibacterial components are adsorbed on the fiber surface. Specifically: Branches of Terminalia chebula were extracted with 70% (v / v) ethanol at a material-to-liquid ratio of 1:12 at 60 °C for 90 min. The extract was then vacuum concentrated to a solid content of 30%, yielding an antibacterial concentrate containing 12.5 mg / g of cork ketone and 3.2 mg / g of squalene. The wet fibers (moisture content greater than or equal to 60%) obtained in step 4 were mixed with the antibacterial concentrate at a mass ratio of 1:0.2 and vacuum impregnated at 0.06-0.1 MPa (preferably 0.08 MPa) for 20-40 min (preferably 30 min) to allow the antibacterial components to adsorb onto the fiber surface. Step 6, freeze drying: The fibers impregnated in step 5 are pre-frozen and sublimated to obtain the desired small-leaved almond wood pulp fibers; Specifically: The fibers impregnated in step 5 are pre-frozen at -45~-55℃ for 240-270 min, preferably at -50℃ for 240 min, and then sublimated and dried for 24-25 h, preferably 24 h, to obtain Terminalia catappa wood pulp fibers with a specific surface area of ​​4.5-6.5 m² / g, preferably 5.6 m² / g, a moisture absorption of 14-16 g / g (25℃, RH90%), preferably 15.2 g / g (25℃, RH90%), and an inhibition zone diameter of 17-20 mm (preferably 18.5 mm) against Klebsiella pneumoniae. The final Terminalia catappa wood pulp fiber is an aggregate composed of multiple individual Terminalia catappa wood pulp fibers.

[0019] like Figure 3 As shown, this invention also discloses a moisture-absorbing core 3, which is made of small-leaved terminalia wood pulp fibers prepared by a method of this invention. The fibers are interwoven to form a honeycomb structure with multiple pore units 13. The moisture-absorbing core 3 is the core component of the moisture-absorbing device. Since the installation position of the moisture-absorbing device is the air inlet of the fan, the purpose of designing it with a honeycomb structure is to reduce the damage to the fan equipment and system malfunctions caused by the wind resistance generated by the device.

[0020] The moisture-absorbing core 3 is produced using wet compression molding with in-situ foaming technology. Through steps of foaming injection molding, vacuum-hot pressing, and drying, a pore size of 28-32 mm, a porosity of 80-85%, and a density of 110-140 kg / m³ are obtained. -3A single block with a compressive strength of 0.35-0.55 MPa.

[0021] The honeycomb structure is formed by the fiber walls of the small-leaved almond wood pulp fibers obtained by the preparation method of the present invention, which are separated into individual pore units 13. These pore units 13 mainly exchange fluids (liquid and gas) through the micropores of the small-leaved almond wood pulp fibers that constitute the fiber walls.

[0022] It should be noted that in the honeycomb structure described in this invention, the pore units can be completely separated by fiber walls. The connectivity or interconnectivity does not depend on specific openings in the pore walls, but rather on the special material itself—the small-leaved almond pulp fiber that constitutes the pore walls. The porous structure inside the fiber and the permeability of the fiber walls allow liquids and gases to pass through the pore walls as if through a filter membrane, thereby achieving functional liquid conduction and gas exchange within the core. This differs from the structure of foam sponges with visible openings.

[0023] The pore size of the cavity unit 13 is 28-32mm, and the extension depth H in the thickness direction of the moisture-absorbing core is 50mm.

[0024] The moisture-absorbing core 3 is covered with a biodegradable non-woven fabric sleeve, which prevents fiber shedding and allows water molecules to pass through freely. The edge of the sleeve is fixed to the moisture-absorbing core 3 (heat-sealed edge), and a portion of the sleeve extends to form a lifting handle 11, ensuring that it can still be pulled out with one hand even when saturated.

[0025] The present invention also discloses a moisture-absorbing device for agricultural greenhouses, including a moisture-absorbing core 3 disclosed in the present invention, and a fixing device for installing the moisture-absorbing core 3.

[0026] This invention includes a type I freestanding moisture absorption device and a type II nested moisture absorption device.

[0027] Type I floor-standing desiccant equipment, such as Figure 1 As shown, the fixing device includes a hollow frame 2, and a moisture-absorbing core 3 is installed in the hollow area of ​​the frame 2. The moisture-absorbing core 3 and the frame 2 constitute a first moisture-absorbing unit. There are multiple first moisture-absorbing units, and multiple first moisture-absorbing units are assembled into one unit through a movable connection.

[0028] The hollow frame 2 has at least one first mounting hole, and the first screw 1 passes through the first mounting hole and fixes the edge area of ​​the moisture-absorbing core 3 to the frame 2.

[0029] The frame 2 has a second mounting hole on its side for mounting the hinge 4. Two adjacent first moisture-absorbing units are joined together by the hinge 4. The specific joining can be adjusted according to actual needs. In this invention, four moisture-absorbing units are joined together.

[0030] The agricultural greenhouse moisture-absorbing device also includes casters 5, which are mounted on the frame 2. There are five casters in this invention.

[0031] Frame 2 is made of PP plastic.

[0032] Type II nested moisture desiccant, such as Figure 2 As shown, the fixing device includes a bracket 7. The top and bottom of the bracket 7 are respectively provided with a nesting groove 9 and a filling groove 10. The nesting groove 9 is used to nest the agricultural greenhouse dehumidifying device in the air inlet end plate of the circulating fan, reducing the additional investment during installation. The filling groove 10 is used to fix the dehumidifying core 3. The Type II nested dehumidifying device also includes a second screw. The two ends of the dehumidifying core 3 are installed in the filling groove 10 by the second screw 6. The nesting groove 9 and the filling groove 10 are L-shaped. The bracket 7 is made of PP plastic.

[0033] Working principle of dehumidifier: The greenhouse is equipped with a negative pressure fan, a circulating fan, or a water curtain-fan system. Under the pressure difference of the fan, humid air first passes through the surface of the core moisture-absorbing core 3. Some pathogen spores are inhibited by the volatile antibacterial components. Then, it enters the honeycomb moisture-absorbing core. Hydroxyl groups on the fiber surface form hydrogen bonds with water molecules, achieving rapid adsorption. Dry air is evenly delivered to the crop canopy through the back guide grid. When the core is saturated with moisture, its color darkens, indicating that its output capacity will be temporarily suspended. At this time, the user only needs 1 minute of downtime to complete the three-step operation of removing the core, squeezing out water, and reinstalling it. The squeezed water can be directly used for irrigation in the greenhouse, achieving zero emissions, while the moisture-absorbing equipment can immediately restore its output function.

[0034] The purpose of this invention is to provide an agricultural greenhouse dehumidifier that consumes zero electricity, is instantly replaceable, reusable, and has built-in antibacterial function. Through an integrated design of "natural fiber honeycomb core – modular clamps," the dehumidification process requires no electricity or chemical desiccants. A saturated module can be replaced with one hand within 1 minute and can be recycled more than 50 times through sun exposure or compression. Simultaneously, it continuously releases natural antibacterial components such as cork ketone, reducing the incidence of airborne diseases by more than 30%. The average annual operating cost per acre is controlled to within 300 yuan, saving more than 85% compared to industrial dehumidifiers. This achieves green, efficient, low-cost, and zero-modification deployment for high humidity control in greenhouses.

[0035] This invention relates to the field of agricultural facility environmental control technology, and in particular to a low-energy moisture-absorbing device specifically designed for high-humidity (RH≥90%) agricultural greenhouses, which uses a recyclable moldable moisture-absorbing module as its core and can be quickly disassembled or recycled.

[0036] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing small-leaved terminalia wood pulp fiber, characterized in that, include: Step 1, Raw material collection and pretreatment: Collect small-leaved Terminalia catappa plants and crush them into wood chips; Step 2, Steam Explosion: Place the wood chips under saturated steam and maintain the pressure for a set time, then release the pressure to complete the explosion; Step 3, enzymatic hydrolysis: Dilute the explosive product obtained in step 2 with water according to the set solid-liquid ratio, adjust the pH to a range suitable for cellulase activity, add an effective amount of cellulase, and stir and enzymatically hydrolyze at the set temperature; Step 4, high-consistency pulping: The enzymatically hydrolyzed pulp is pulped to obtain wood pulp fibers with a set freeness and a set weighted average fiber length. Step 5, Antibacterial component extraction and compounding: Extract antibacterial active components from small-leaved terminalia plants and mix and impregnate them with the wet fibers obtained in step 4, so that the antibacterial components are adsorbed on the fiber surface. Step 6, freeze drying: The fibers impregnated in step 5 are pre-frozen and sublimated to obtain the desired small-leaved almond wood pulp fibers.

2. The preparation method according to claim 1, characterized in that, In step 1, the small-leaved terminalia plant is washed, cut into sections, and then crushed into 20-40 mesh wood chips using a hammer mill. In step 2, the wood chips are placed under saturated steam at 1.5-2.0 MPa for 4-8 minutes. In step 3, the explosive material is diluted with water at a solid-liquid ratio of 1:8 (w / w), the pH is adjusted to 4.5-5.5, 5 U / g of cellulase (based on oven-dried wood chips) is added, and enzymatic hydrolysis is carried out for 1-3 hours at a temperature of 40-50℃ and a stirring temperature of 130-170 r / min. In step 4, the enzymatically hydrolyzed pulp is washed until neutral and fed into a double-disc mill with a disc gap of 0.1-0.2 mm. The mill is circulated 2-4 times to obtain wood pulp fibers with a freeness of 40-50°SR and a weighted average fiber length of 0.6-0.9 mm.

3. In step 5, take branches of Terminalia catappa and extract them with 70% (v / v) ethanol at a material-to-liquid ratio of 1:12 at 50 ℃-70 ℃ for 80-100 min. Concentrate under vacuum to a solid content of 30% to obtain an antibacterial concentrate containing 12.5 mg / g of cork ketone and 3.2 mg / g of squalene. Mix the wet fiber obtained in step 4 with the antibacterial concentrate at a mass ratio of 1:0.2 and impregnate under vacuum at 0.06-0.1 MPa for 20-40 min to allow the antibacterial components to be adsorbed onto the fiber surface. In step 6, the fibers impregnated in step 5 are pre-frozen at -45~-55℃ for 240-270 min, and then sublimated and dried for 24-25 h to obtain small-leaved Terminalia catappa wood pulp fibers with a specific surface area of ​​4.5-6.5 m² / g, moisture absorption of 14-16 g / g (25 ℃, RH90 %), and an inhibition zone diameter of 17-20 mm against Klebsiella pneumoniae.

4. A moisture-absorbing core (3), characterized in that, The moisture-absorbing core (3) is formed by interweaving small-leaved almond wood pulp fibers as described in claim 1 or 2 to form a honeycomb structure with multiple pore units (13).

5. The moisture-absorbing core (3) according to claim 3, characterized in that, The density of the moisture-absorbing core (3) is 110-140 kg m³. -3 The compressive strength is 0.35-0.55 MPa, and the porosity is 80-85%; the pore size of the pore unit (13) is 28-32 mm, and the extension depth H in the thickness direction of the moisture-absorbing core is 50 mm.

6. The moisture-absorbing core (3) according to claim 3, characterized in that, The moisture-absorbing core (3) is covered with a packaging sleeve made of biodegradable non-woven fabric.

7. The moisture-absorbing core (3) according to claim 5, characterized in that, The edge of the encapsulation sleeve is fixed to the moisture-absorbing core (3), and a portion of the encapsulation sleeve extends to form a lifting handle (11).

8. A moisture-absorbing device for agricultural greenhouses, characterized in that, It includes the moisture-absorbing core (3) as described in any one of claims 3-6, and a fixing device for mounting the moisture-absorbing core (3).

9. The agricultural greenhouse moisture-absorbing device according to claim 7, characterized in that, The fixing device includes a hollow frame (2), and the moisture-absorbing core (3) is installed in the hollow area of ​​the frame (2). The moisture-absorbing core (3) and the frame (2) constitute a first moisture-absorbing unit.

10. The agricultural greenhouse moisture-absorbing device according to claim 8, characterized in that, The first moisture-absorbing unit is multiple, and the multiple first moisture-absorbing units are assembled into one unit through a movable connection; the hollow frame (2) is provided with at least one first mounting hole, and the first screw (1) passes through the first mounting hole to fix the edge area of ​​the moisture-absorbing core (3) to the frame (2); the frame (2) is provided with a second mounting hole on the side, and the second mounting hole is used to install a hinge (4), and two adjacent first moisture-absorbing units are assembled into one unit through the hinge (4); the agricultural greenhouse moisture-absorbing equipment also includes a universal wheel (5), and the universal wheel (5) is installed on the frame (2); the frame (2) is made of PP plastic.

11. The agricultural greenhouse moisture-absorbing device according to claim 7, characterized in that, The fixing device includes a bracket (7), and the top and bottom of the bracket (7) are respectively provided with a nesting groove (9) and a filling groove (10). The nesting groove (9) is used to nest the agricultural greenhouse moisture absorption device in the air inlet end plate of the circulating fan, and the filling groove (10) is used to fix the moisture absorption core (3). The nesting groove (9) and the filling groove (10) are L-shaped. The bracket (7) is made of PP plastic.

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