A high-efficiency cleaning and drying process for glass fiber plates

Abstract

The application discloses a kind of glass fiber plate high-efficiency cleaning and drying process, comprising the following steps: S1: pretreatment: the appearance inspection of glass fiber plate to be cleaned is carried out, and the unqualified plate material with obvious damage, crack existing on surface is rejected;S2: pre-cleaning: the glass fiber plate after preliminary treatment is placed in ultrasonic cleaning tank, and clean water is injected into cleaning tank, and the liquid level of clean water needs to completely immerse glass fiber plate, and ultrasonic generator is started simultaneously, and through the cavitation effect of ultrasonic wave, the dust, loose debris and other impurities on the surface of glass fiber plate are separated, and pre-cleaning is completed;S3: chemical cleaning: after pre-cleaning is completed, glass fiber plate is sent into chemical cleaning tank equipped with alkaline pre-cleaning solution.This process realizes high-efficiency cleaning, rapid drying of glass fiber plate by combining multiple cleaning procedures with ultrasonic wave, chemical reagent and nanoparticles, and cooperating with vacuum and hot air drying, and the impurity residue is less, the moisture content is low, the surface flatness is good, and the parameter adaptability is strong, energy saving and environmental protection, and the degree of automation is high.

Description

Technical Field

[0001] This invention relates to the field of fiberglass board technology, and in particular to a high-efficiency cleaning and drying process for fiberglass boards. Background Technology

[0002] Fiberglass board, also known as glass fiber board, is widely used in many fields such as electronics, aerospace, etc. due to its excellent insulation, heat resistance and mechanical properties. During the production and processing of fiberglass board, its surface often retains contaminants such as dust, oil, and organic impurities. These contaminants not only affect the appearance quality of the fiberglass board, but also have an adverse effect on subsequent processing technology and product performance, such as reducing the insulation performance of the board and affecting the bonding effect of the board with other materials. Currently, existing fiberglass board cleaning and drying processes suffer from problems such as incomplete cleaning, low drying efficiency, and unreasonable control of process parameters. Some traditional cleaning methods cannot effectively remove stubborn stains and are prone to leaving cleaning agent residues. During the drying process, the moisture evaporation rate is slow, energy consumption is high, and improper temperature control may cause deformation and damage to the fiberglass board. These processes are difficult to meet the requirements of modern industrial production for fiberglass board quality and production efficiency. Therefore, we propose a high-efficiency fiberglass board cleaning and drying process to solve the above problems. Summary of the Invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a high-efficiency cleaning and drying process for fiberglass boards.

[0004] The present invention proposes a high-efficiency cleaning and drying process for fiberglass boards, comprising the following steps: S1: Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface. S2: Pre-cleaning: Place the pre-treated fiberglass board into the ultrasonic cleaning tank, pour clean water into the cleaning tank, and the water level must completely submerge the fiberglass board. At the same time, start the ultrasonic generator. Through the cavitation effect of the ultrasonic waves, the dust, loose debris and other impurities on the surface of the fiberglass board are removed, and the pre-cleaning is completed. The bottom of the pre-cleaning tank is equipped with a filter device, which can filter out the impurities generated during the cleaning process in real time to prevent the impurities from re-adhering to the fiberglass board. S3: Chemical Cleaning: After pre-cleaning, the fiberglass board is placed in a chemical cleaning tank containing an alkaline pre-cleaning solution. The fiberglass board is immersed in the alkaline cleaning agent and mechanically stirred. The alkaline cleaning agent can effectively remove oil and organic impurities from the surface of the fiberglass board. Mechanical stirring can enhance the cleaning effect and ensure that the cleaning agent is in full contact with the surface of the fiberglass board. In addition, the chemical cleaning tank is equipped with a circulation pump, which can continuously circulate the alkaline cleaning agent and improve the utilization rate of the cleaning agent. S4: Enhanced Cleaning: Chemical cleaning. Without removing the fiberglass board, add an appropriate amount of nano-sized silica particles to the chemical cleaning tank. Under mechanical stirring, continue mechanical stirring for 3-5 minutes to physically rub away stubborn stains on the surface of the fiberglass board, further improving the cleaning effect. S5: Secondary cleaning: After chemical cleaning and reinforcement cleaning, the fiberglass board is placed in a secondary cleaning tank filled with clean water and cleaned by high-pressure spraying. The high-pressure spraying washes away the alkaline cleaning agent residue on the surface of the fiberglass board, avoiding the cleaning agent residue from affecting the performance of the fiberglass board. S6: Surface activation treatment: After secondary cleaning, the fiberglass board is placed in an activation treatment tank containing surfactants. The surfactants can reduce the surface tension of the fiberglass board surface and increase the hydrophilicity of the fiberglass board surface, creating favorable conditions for subsequent drying treatment. The activation treatment tank is equipped with an automatic liquid level replenishment device, which can monitor and replenish the activation treatment in real time. S7: Preliminary Draining: After the surface activation treatment is completed, the fiberglass board is passed through an inclined conveyor belt, so that most of the surface moisture is initially drained under the action of gravity. S8: Drying: Place the partially drained fiberglass board into a vacuum drying oven. Vacuum drying can lower the boiling point of water, accelerate the evaporation rate of water, and further remove residual moisture under high temperature environment to achieve rapid drying of fiberglass board. S9: Hot air assisted drying: After vacuum drying is completed, the fiberglass board is transferred to the hot air drying chamber and assisted drying is carried out using circulating hot air; S10: Cooling and Quality Inspection Packaging: Take out the dried fiberglass board and place it in a room temperature environment to cool naturally to room temperature to avoid deformation or damage caused by excessive temperature. Perform quality inspection on the cooled fiberglass board, using an optical microscope and surface roughness meter to check the surface cleanliness and roughness of the fiberglass board to ensure that it meets the quality standards. After passing the inspection, use anti-static packaging materials to package the fiberglass board and store it in a dry and ventilated environment.

[0005] Preferably, in step S2, the ultrasonic frequency is set to 20-40kHz, and the cleaning time is 5-10 minutes.

[0006] Preferably, the main components of the alkaline pre-cleaning solution are sodium hydroxide, sodium carbonate, and surfactant, wherein the mass fraction of sodium hydroxide is 3%-5%, the mass fraction of sodium carbonate is 2%-4%, and the mass fraction of surfactant is 1%-2%.

[0007] Preferably, the temperature of the alkaline pre-cleaning solution in S3 is controlled at 50-60℃, the stirring speed of the mechanical agitator is 100-200 rpm, and the cleaning time is 10-15 minutes.

[0008] Preferably, the amount of nano-sized silica particles added is 5-10 grams per liter of alkaline pre-cleaning solution.

[0009] Preferably, the pressure of the high-pressure water pump is set to 0.5-1 MPa, and the spraying time is 3-5 minutes.

[0010] Preferably, the concentration of the surfactant is 1-3%, the temperature is 30-40℃, and the soaking time is 5-8 minutes.

[0011] Preferably, the draining time in S7 is 1-2 minutes, and the tilt angle of the inclined conveyor belt is 15-30°, which helps the water to slide off quickly.

[0012] Preferably, the vacuum drying oven in S8 is set with a vacuum degree of -0.08 to 0.09 MPa, a drying temperature of 80 to 100°C, and a drying time of 10 to 15 minutes.

[0013] Preferably, the hot air temperature is set to 60-70℃, the wind speed is 2-3m / s, and the drying time is 3-5 minutes to further remove any trace moisture that may remain on the surface of the fiberglass board and ensure the drying effect.

[0014] The beneficial effects of this invention are: 1. It has high-efficiency cleaning performance. Through multiple cleaning processes such as pre-cleaning, chemical cleaning, enhanced cleaning and secondary cleaning, combined with ultrasonic cavitation, chemical reagent cleaning and physical friction of nano-sized particles, it can effectively remove various impurities on the surface of fiberglass board, including dust, oil, organic impurities and stubborn stains, so that the surface of fiberglass board can achieve a high degree of cleanliness. 2. It has high drying efficiency, adopting a combination of vacuum drying and hot air-assisted drying. Vacuum drying lowers the boiling point of water and accelerates moisture evaporation, while hot air-assisted drying further removes trace amounts of moisture, greatly shortening the drying time and improving production efficiency. At the same time, it avoids the problem of fiberglass board deformation and damage caused by excessive drying time or improper temperature control. 3. It has the ability to optimize process parameters. The parameters in each process step are set scientifically and reasonably, such as ultrasonic frequency, cleaning time, chemical reagent concentration, temperature, stirring speed, drying temperature and time, etc., to ensure that each process cooperates and works together to achieve the best cleaning and drying effect and ensure the stability of product quality. 4. It has energy-saving and environmentally friendly performance. The chemical cleaning tank is equipped with a circulation pump, which improves the utilization rate of cleaning agents and reduces the waste of chemical reagents. The reasonable drying process reduces energy consumption while ensuring the drying effect, which meets the requirements of energy conservation and environmental protection. Detailed Implementation

[0015] The present invention will be further explained below with reference to specific embodiments. Example

[0016] This embodiment proposes a high-efficiency cleaning and drying process for fiberglass boards, including the following steps: Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface; Pre-cleaning: Place the pre-treated fiberglass board into the ultrasonic cleaning tank, fill it with clean water to completely submerge the fiberglass board, set the ultrasonic frequency to 20kHz, the cleaning time to 10 minutes, start the ultrasonic generator for pre-cleaning, and filter impurities in real time at the bottom of the pre-cleaning tank. Chemical cleaning: After pre-cleaning, the fiberglass board is placed into a chemical cleaning tank containing an alkaline pre-cleaning solution. The alkaline pre-cleaning solution contains 3% sodium hydroxide, 2% sodium carbonate, and 1% surfactant. The cleaning temperature is controlled at 50℃, the mechanical stirring speed is 100 rpm, and the cleaning time is 15 minutes. At the same time, a circulating pump is used to circulate the alkaline cleaning agent. Enhanced cleaning: After chemical cleaning, without removing the fiberglass board, add 5 grams of nano-sized silica particles to each liter of alkaline pre-cleaning solution in the chemical cleaning tank, and continue stirring for 3 minutes under mechanical stirring. Secondary cleaning: Place the fiberglass board into a secondary cleaning tank filled with clean water, set the high-pressure water pump pressure to 0.5MPa, and the spraying time to 5 minutes, and use high-pressure spraying to clean the residual alkaline cleaning agent. Surface activation treatment: After secondary cleaning, the fiberglass board is placed in an activation treatment solution tank containing 1% surfactant at a temperature of 30°C and soaked for 8 minutes. The automatic liquid level replenishment device monitors and replenishes the activation treatment solution in real time. Preliminary draining: After the surface activation treatment is completed, the fiberglass board is passed through a conveyor belt with an inclination angle of 15° for 2 minutes to perform preliminary draining; Drying: Place the partially drained fiberglass board into a vacuum drying oven with a vacuum degree of -0.08MPa and a drying temperature of 80℃, and dry for 15 minutes; Hot air assisted drying: After vacuum drying is completed, the fiberglass board is transferred to a hot air drying chamber with a hot air temperature of 60℃ and a wind speed of 2m / s and dried for 5 minutes; Cooling and quality inspection packaging: After drying, the fiberglass board is taken out and allowed to cool naturally to room temperature. It is then inspected using an optical microscope and a surface roughness tester. Once the inspection is passed, it is packaged with anti-static packaging materials and stored in a dry and ventilated environment. Example

[0017] This embodiment proposes a high-efficiency cleaning and drying process for fiberglass boards, including the following steps: Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface; Pre-cleaning: Place the pre-treated fiberglass board into an ultrasonic cleaning tank, fill it with clean water to completely submerge the fiberglass board, set the ultrasonic frequency to 40kHz, and the cleaning time to 5 minutes. Chemical cleaning: The alkaline pre-cleaning solution contains 5% sodium hydroxide, 4% sodium carbonate, and 2% surfactant. The cleaning temperature is controlled at 60℃, the mechanical stirring speed at 200 rpm, and the cleaning time at 10 minutes. Enhanced cleaning: Add 10 grams of nano-sized silica particles to each liter of alkaline pre-cleaning solution and stir for 5 minutes; Secondary cleaning: High-pressure water pump pressure is 1MPa, spraying time is 3 minutes; Surface activation treatment: Surfactant concentration of 3%, temperature of 40℃, immersion for 5 minutes; Preliminary draining: The inclined conveyor belt is inclined at an angle of 30°, and the draining time is 1 minute; Drying: The vacuum drying oven has a vacuum degree of -0.09MPa and a drying temperature of 100℃ for 10 minutes; Hot air assisted drying: hot air temperature is 70℃, wind speed is 3m / s, drying time is 3 minutes; Cooling and Quality Inspection Packaging: After drying, the fiberglass board is taken out and allowed to cool naturally to room temperature. It is then inspected using an optical microscope and a surface roughness tester. Once the inspection is passed, it is packaged with anti-static packaging materials and stored in a dry and ventilated environment. Example

[0018] This embodiment proposes a high-efficiency cleaning and drying process for fiberglass boards, including the following steps: Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface; Pre-cleaning: Place the pre-treated fiberglass board into an ultrasonic cleaning tank, fill it with clean water to completely submerge the fiberglass board, set the ultrasonic frequency to 30kHz, and the cleaning time to 8 minutes. Chemical cleaning: The alkaline pre-cleaning solution contains 4% sodium hydroxide, 3% sodium carbonate, and 1.5% surfactant. The cleaning temperature is 55℃, the mechanical stirring speed is 150 rpm, and the cleaning time is 12 minutes. Enhanced cleaning: Add 8 grams of nano-sized silica particles per liter of alkaline pre-cleaning solution and stir for 4 minutes; Secondary cleaning: High-pressure water pump pressure 0.8MPa, spraying time 4 minutes; Surface activation treatment: Surfactant concentration 2%, temperature 35℃, immersion for 6 minutes; Preliminary draining: Inclined conveyor belt at an angle of 20°, draining time 1.5 minutes; Drying: Vacuum drying oven with a vacuum degree of -0.085MPa, drying temperature of 90℃, drying time of 12 minutes; Hot air assisted drying: hot air temperature 65℃, wind speed 2.5m / s, drying time 4 minutes; Cooling and quality inspection packaging: After drying, the fiberglass board is taken out and allowed to cool naturally to room temperature. It is then inspected using an optical microscope and a surface roughness tester. Once the inspection is passed, it is packaged with anti-static packaging materials and stored in a dry and ventilated environment. Example

[0019] This embodiment proposes a high-efficiency cleaning and drying process for fiberglass boards, including the following steps: Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface; Pre-cleaning: Place the pre-treated fiberglass board into an ultrasonic cleaning tank, fill it with clean water to completely submerge the fiberglass board, set the ultrasonic frequency to 25kHz, and the cleaning time to 7 minutes. Chemical cleaning: The alkaline pre-cleaning solution contains 3.5% sodium hydroxide, 2.5% sodium carbonate, and 1.2% surfactant. The cleaning temperature is 52℃, the mechanical stirring speed is 120 rpm, and the cleaning time is 13 minutes. Enhanced cleaning: Add 6 grams of nano-sized silica particles per liter of alkaline pre-cleaning solution and stir for 3.5 minutes; Secondary cleaning: High-pressure water pump pressure 0.6MPa, spraying time 4 minutes; Surface activation treatment: surfactant concentration 1.5%, temperature 32℃, soaking for 7 minutes; Preliminary draining: Inclined conveyor belt at an angle of 18°, draining time 1.8 minutes; Drying: Vacuum drying oven with a vacuum degree of -0.082MPa, drying temperature of 85℃, drying time of 13 minutes; Hot air assisted drying: hot air temperature 62℃, wind speed 2.2m / s, drying time 4 minutes; Cooling and quality inspection packaging: After drying, the fiberglass board is taken out and allowed to cool naturally to room temperature. It is then inspected using an optical microscope and a surface roughness tester. Once the inspection is passed, it is packaged with anti-static packaging materials and stored in a dry and ventilated environment. Example

[0020] This embodiment proposes a high-efficiency cleaning and drying process for fiberglass boards, including the following steps: Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface; Pre-cleaning: Place the pre-treated fiberglass board into an ultrasonic cleaning tank, fill it with clean water to completely submerge the fiberglass board, set the ultrasonic frequency to 35kHz, and the cleaning time to 6 minutes. Chemical cleaning: The alkaline pre-cleaning solution contains 4.5% sodium hydroxide, 3.5% sodium carbonate, and 1.8% surfactant. The cleaning temperature is 58℃, the mechanical stirring speed is 180 rpm, and the cleaning time is 11 minutes. Enhanced cleaning: Add 9 grams of nano-sized silica particles per liter of alkaline pre-cleaning solution and stir for 4.5 minutes; Secondary cleaning: High-pressure water pump pressure 0.9MPa, spraying time 3.5 minutes; Surface activation treatment: surfactant concentration 2.5%, temperature 38℃, immersion for 6 minutes; Preliminary draining: Inclined conveyor belt at an angle of 25°, draining time 1.2 minutes; Drying: Vacuum drying oven with a vacuum degree of -0.088MPa, drying temperature of 95℃, drying time of 11 minutes; Hot air assisted drying: hot air temperature 68℃, wind speed 2.8m / s, drying time 3.5 minutes; Cooling and quality inspection packaging: After drying, the fiberglass board is taken out and allowed to cool naturally to room temperature. It is then inspected using an optical microscope and a surface roughness tester. Once the inspection is passed, it is packaged with anti-static packaging materials and stored in a dry and ventilated environment.

[0021] This invention features highly efficient cleaning performance. Through multiple cleaning processes including pre-cleaning, chemical cleaning, enhanced cleaning, and secondary cleaning, combined with ultrasonic cavitation, chemical reagent cleaning, and physical friction from nano-sized particles, it effectively removes various impurities from the surface of fiberglass boards, including dust, oil, organic impurities, and stubborn stains, achieving a high degree of cleanliness. It also boasts high drying efficiency, employing a combination of vacuum drying and hot air-assisted drying. Vacuum drying lowers the boiling point of water, accelerating moisture evaporation, while hot air-assisted drying further removes trace amounts of moisture, significantly shortening drying time and improving production efficiency. Simultaneously, it avoids fiberglass board deformation and damage caused by excessive drying time or improper temperature control. Furthermore, it features optimized process parameters. Scientific and reasonable settings are implemented for parameters in each process step, such as ultrasonic frequency, cleaning time, chemical reagent concentration, temperature, stirring speed, and drying temperature and time, ensuring synergistic effects between processes to achieve optimal cleaning and drying results and guaranteeing product quality stability.

[0022] The results of cleaning and drying the fiberglass boards in the above embodiments, after testing, yielded the data shown in the table below.

[0023] The results show that Example 3 is the best embodiment.

[0024] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency cleaning and drying process for fiberglass boards, characterized in that, Includes the following steps: S1： Pre-treatment: Visually inspect the fiberglass boards to be cleaned and remove any unqualified boards with obvious damage or cracks on the surface; S2: Pre-cleaning: Place the pre-treated fiberglass board into the ultrasonic cleaning tank, inject clean water into the cleaning tank, and the water level should completely submerge the fiberglass board. At the same time, start the ultrasonic generator. Through the cavitation effect of ultrasonic waves, the dust, loose debris and other impurities on the surface of the fiberglass board are removed, and the pre-cleaning is completed. S3: Chemical cleaning: After pre-cleaning, the fiberglass board is sent into a chemical cleaning tank containing alkaline pre-cleaning solution. The fiberglass board is immersed in the alkaline cleaning agent and mechanically stirred. The alkaline cleaning agent can effectively remove oil and organic impurities from the surface of the fiberglass board. Mechanical stirring can enhance the cleaning effect and make the cleaning agent fully contact the surface of the fiberglass board. S4: Enhanced Cleaning: Chemical cleaning. Without removing the fiberglass board, add an appropriate amount of nano-sized silica particles to the chemical cleaning tank. Under mechanical stirring, continue mechanical stirring for 3-5 minutes to physically rub away stubborn stains on the surface of the fiberglass board, further improving the cleaning effect. S5: Secondary cleaning: After chemical cleaning and reinforcement cleaning, the fiberglass board is placed in a secondary cleaning tank filled with clean water and cleaned by spraying. The spraying will rinse away the alkaline cleaning agent remaining on the surface of the fiberglass board, so as to avoid the cleaning agent residue affecting the performance of the fiberglass board. S6: Surface activation treatment: After secondary cleaning, the fiberglass board is placed in an activation treatment tank containing surfactants. The surfactants can reduce the surface tension of the fiberglass board surface and increase the hydrophilicity of the fiberglass board surface, creating favorable conditions for subsequent drying treatment. The activation treatment tank is equipped with an automatic liquid level replenishment device, which can monitor and replenish the activation treatment in real time. S7: Preliminary Draining: After the surface activation treatment is completed, the fiberglass board is passed through an inclined conveyor belt, so that most of the surface moisture is initially drained under the action of gravity. S8: Drying: Place the partially drained fiberglass board into a vacuum drying oven. Vacuum drying can lower the boiling point of water, accelerate the evaporation rate of water, and further remove residual moisture under high temperature environment to achieve rapid drying of fiberglass board. S9: Hot air assisted drying: After vacuum drying is completed, the fiberglass board is transferred to the hot air drying chamber and assisted drying is carried out using circulating hot air; S10: Cooling and Quality Inspection Packaging: Take out the dried fiberglass board and place it in a room temperature environment to cool naturally to room temperature to avoid deformation or damage caused by excessive temperature. Perform quality inspection on the cooled fiberglass board, using an optical microscope and surface roughness meter to check the surface cleanliness and roughness of the fiberglass board to ensure that it meets the quality standards. After passing the inspection, use anti-static packaging materials to package the fiberglass board and store it in a dry and ventilated environment.

2. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, In step S2, the ultrasonic frequency is set to 20-40kHz, and the cleaning time is 5-10 minutes.

3. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The main components of the alkaline pre-cleaning solution are sodium hydroxide, sodium carbonate, and surfactant, wherein the mass fraction of sodium hydroxide is 3%-5%, the mass fraction of sodium carbonate is 2%-4%, and the mass fraction of surfactant is 1%-2%.

4. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The temperature of the alkaline pre-cleaning solution in S3 is controlled at 50-60℃, the stirring speed of the mechanical agitator is 100-200 rpm, and the cleaning time is 10-15 minutes.

5. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The amount of the nano-sized silica particles added is 5-10 grams per liter of alkaline pre-cleaning solution.

6. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The spray pressure is set to 0.5-1 MPa, and the spraying time is 3-5 minutes.

7. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The surfactant concentration is 1-3%, the temperature is 30-40℃, and the soaking time is 5-8 minutes.

8. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The draining time in S7 is 1-2 minutes, and the tilt angle of the inclined conveyor belt is 15-30°, which helps the water to slide off quickly.

9. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The vacuum drying oven in S8 is set with a vacuum degree of -0.08 to 0.09 MPa, a drying temperature of 80 to 100°C, and a drying time of 10 to 15 minutes.

10. The high-efficiency cleaning and drying process for fiberglass boards according to claim 1, characterized in that, The hot air temperature is set to 60-70℃, the wind speed is 2-3m / s, and the drying time is 3-5 minutes to further remove any trace moisture that may remain on the surface of the fiberglass board and ensure the drying effect.

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