Introduce a bit of experience: Crown Prince is a very large design and screen printing company with customers in the screen printing garment factory in Wisconsin across the United States. A screen printing plate with a mesh is made through a template, and the printing process for ink passing through the mesh is screen printing. Screen recycling is a process that removes the residual ink and coating. Thorough removal of these residual inks or coatings usually requires the use of solvents containing volatile organic compounds. The Wisconsin Department of Natural Resources (WDNR) requires owners or operators of non-exempt screen printing facilities to record emissions of volatile organic compounds during the screen recovery process, and to ensure that volatile organic compound emissions are below specified levels .
In November 2004, Crown Prince received a WDNR notice that it exceeded the VOC emission standards during screen recycling. After implementing a comprehensive recording scheme, Crown Prince intends to reduce the emissions of volatile organic compounds during screen recycling. By adjusting the process and finding material alternatives, Crown Prince has been able to substantially reduce the amount of volatile organic compounds emitted during screen recycling. This article mainly introduces its improved process and found material substitutes.
National standard:
WDNR's regulations require owners or operators of non-exempt screen printing facilities to “not exceed 0.24 kg/m2 (0.05 lb/ft2) in volatile organic compound emissions during screen recycling.†This rule also requires the owner or operator of the non-exempt screen printing facility to record the following information: (1) The average daily emission rate of volatile organic compounds in the screen recycling process, in kilograms per square meter (pounds per Square foot) calculation. (2) Daily emissions of volatile organic compounds in kilograms (pounds). (3) The total surface area of ​​the screen recovered in one day in square meters (square feet).
Recovery records and process changes:
Upon receiving the notification from WDNR, Crown Prince reassessed its recording procedures and improved its method of recording the amount of screen and solvent used for recycling during screen recycling. In addition, Crown Prince has started looking for ways to substantially reduce VOC emissions.
The change of process also maximizes the use of the product and reduces the VOC emissions. For example, the operator of the automatic ink washer must undergo retraining to learn how to clean excess cleaning solvent from the mesh after the ink is washed, and recover it for reuse in the cleaning system. In addition, the cleaning agent should be separated from the waste ink. Usually, after standing overnight, the upper layer of the mixture is sucked out and reused in the cleaning system.
In addition, the company has also taken some other measures to reduce the emissions of volatile organic compounds. If the cleaning system uses the most primitive installation method, the waste liquid in the cleaning chamber will continue to overflow. As a result, the loss of reagents is caused, and volatile organic compounds are emitted by evaporation. To reduce this loss, Crown Prince installed a system controller that drains the cleaning chamber within seconds of each cleaning cycle. This greatly reduces the amount of chemical reagents that leak out of the system, thereby avoiding the emission of volatile organic compounds into the air.
Change of chemical reagents:
Due to the high volatile organic compound content of most solvents, Crown Prince is also working on screen recovery solvents with low levels of volatile organic compounds while trying to reduce emissions of volatile organic compounds during screen recycling. Assessment.
Image Technology is a company specializing in the production of environmentally friendly screen recycling products and automatic screen recycling systems. Crown Prince tried a new type of screen recovery solvent produced by the company. Its volatile organic compound content is lower than that of the currently used solvents. 75%. In addition to containing fewer volatile organic compounds, this product, called CLEAN AIRE 404, has a lower volatilization rate and a higher flash point (>600°F). The new solvent removes the ink better than the old solvent, so Crown Prince switched to this new chemical reagent. Since then, the use of new chemical reagents has brought about an increase in production for the company (a 50% increase in the area of ​​the washable web per gallon of reagent), and during screen recycling, volatile organics The emissions of compounds have also been greatly reduced.
in conclusion:
After establishing a comprehensive records program, Crown Prince has adopted a series of improvements to its screen-recycling production lines to reduce the emissions of volatile organic compounds. In addition, after making all the efforts to find recovery reagents with low levels of volatile organic compounds, the company will target a new product with a VOC content reduction of 75% compared to common reagents.
Crown Prince has become more environmentally conscious and has been working to reduce the emissions of volatile organic compounds. Whenever a process or equipment is to be changed, environmental issues will be a major factor in their consideration.
In November 2004, Crown Prince received a WDNR notice that it exceeded the VOC emission standards during screen recycling. After implementing a comprehensive recording scheme, Crown Prince intends to reduce the emissions of volatile organic compounds during screen recycling. By adjusting the process and finding material alternatives, Crown Prince has been able to substantially reduce the amount of volatile organic compounds emitted during screen recycling. This article mainly introduces its improved process and found material substitutes.
National standard:
WDNR's regulations require owners or operators of non-exempt screen printing facilities to “not exceed 0.24 kg/m2 (0.05 lb/ft2) in volatile organic compound emissions during screen recycling.†This rule also requires the owner or operator of the non-exempt screen printing facility to record the following information: (1) The average daily emission rate of volatile organic compounds in the screen recycling process, in kilograms per square meter (pounds per Square foot) calculation. (2) Daily emissions of volatile organic compounds in kilograms (pounds). (3) The total surface area of ​​the screen recovered in one day in square meters (square feet).
Recovery records and process changes:
Upon receiving the notification from WDNR, Crown Prince reassessed its recording procedures and improved its method of recording the amount of screen and solvent used for recycling during screen recycling. In addition, Crown Prince has started looking for ways to substantially reduce VOC emissions.
The change of process also maximizes the use of the product and reduces the VOC emissions. For example, the operator of the automatic ink washer must undergo retraining to learn how to clean excess cleaning solvent from the mesh after the ink is washed, and recover it for reuse in the cleaning system. In addition, the cleaning agent should be separated from the waste ink. Usually, after standing overnight, the upper layer of the mixture is sucked out and reused in the cleaning system.
In addition, the company has also taken some other measures to reduce the emissions of volatile organic compounds. If the cleaning system uses the most primitive installation method, the waste liquid in the cleaning chamber will continue to overflow. As a result, the loss of reagents is caused, and volatile organic compounds are emitted by evaporation. To reduce this loss, Crown Prince installed a system controller that drains the cleaning chamber within seconds of each cleaning cycle. This greatly reduces the amount of chemical reagents that leak out of the system, thereby avoiding the emission of volatile organic compounds into the air.
Change of chemical reagents:
Due to the high volatile organic compound content of most solvents, Crown Prince is also working on screen recovery solvents with low levels of volatile organic compounds while trying to reduce emissions of volatile organic compounds during screen recycling. Assessment.
Image Technology is a company specializing in the production of environmentally friendly screen recycling products and automatic screen recycling systems. Crown Prince tried a new type of screen recovery solvent produced by the company. Its volatile organic compound content is lower than that of the currently used solvents. 75%. In addition to containing fewer volatile organic compounds, this product, called CLEAN AIRE 404, has a lower volatilization rate and a higher flash point (>600°F). The new solvent removes the ink better than the old solvent, so Crown Prince switched to this new chemical reagent. Since then, the use of new chemical reagents has brought about an increase in production for the company (a 50% increase in the area of ​​the washable web per gallon of reagent), and during screen recycling, volatile organics The emissions of compounds have also been greatly reduced.
in conclusion:
After establishing a comprehensive records program, Crown Prince has adopted a series of improvements to its screen-recycling production lines to reduce the emissions of volatile organic compounds. In addition, after making all the efforts to find recovery reagents with low levels of volatile organic compounds, the company will target a new product with a VOC content reduction of 75% compared to common reagents.
Crown Prince has become more environmentally conscious and has been working to reduce the emissions of volatile organic compounds. Whenever a process or equipment is to be changed, environmental issues will be a major factor in their consideration.
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