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Environmental temperature and humidity control requirements in the workshop of packaging manufacturers

Environmental temperature and humidity control requirements in the workshop of packaging manufacturers

  • Categories:Industry Trends
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  • Time of issue:2021-01-19 15:56
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(Summary description)Due to the moisture absorption of nylon film and the series of adverse consequences caused by moisture absorption, there are certain requirements for the environment of paper-plastic packaging manufacturers. Generally, it should be stored at about 23°C, ±3°C, and the dry humidity difference is ideal within the range of 60%RH±5%RH. The nylon membrane cannot be placed directly on the floor or in the open air to avoid moisture absorption. The difference between dry and wet in the production environment generally does not exceed 75% RH. If it reaches 80% RH, production should be stopped (especially compound production) to avoid bad causes. If the task must be put into production, exhaust fans and dehumidifiers can be added to the production site to enhance indoor air circulation and reduce the humidity of the production environment to below 70%RH for reproduction. In short, when the humidity exceeds 70%RH, you must use it with caution. When the temperature is low or the humidity is too high, you must turn on the preheating equipment of the printing and laminating machine, first preheat the nylon film, and dry it on the surface of the nylon film. In order to facilitate the smooth progress of printing and composite production; at the turn of winter and spring, due to large temperature changes, when using mixed solvents, pay attention to effective adjustments with changes in temperature to prevent solvents from evaporating too fast or residual solvents. More quality accidents.

Environmental temperature and humidity control requirements in the workshop of packaging manufacturers

Environmental temperature and humidity control requirements in the workshop of packaging manufacturers

Environmental temperature and humidity control requirements in the workshop of packaging manufacturers

Environmental temperature and humidity control requirements in the workshop of packaging manufacturers

(Summary description)Due to the moisture absorption of nylon film and the series of adverse consequences caused by moisture absorption, there are certain requirements for the environment of paper-plastic packaging manufacturers. Generally, it should be stored at about 23°C, ±3°C, and the dry humidity difference is ideal within the range of 60%RH±5%RH. The nylon membrane cannot be placed directly on the floor or in the open air to avoid moisture absorption. The difference between dry and wet in the production environment generally does not exceed 75% RH. If it reaches 80% RH, production should be stopped (especially compound production) to avoid bad causes. If the task must be put into production, exhaust fans and dehumidifiers can be added to the production site to enhance indoor air circulation and reduce the humidity of the production environment to below 70%RH for reproduction. In short, when the humidity exceeds 70%RH, you must use it with caution. When the temperature is low or the humidity is too high, you must turn on the preheating equipment of the printing and laminating machine, first preheat the nylon film, and dry it on the surface of the nylon film. In order to facilitate the smooth progress of printing and composite production; at the turn of winter and spring, due to large temperature changes, when using mixed solvents, pay attention to effective adjustments with changes in temperature to prevent solvents from evaporating too fast or residual solvents. More quality accidents.

  • Categories:Industry Trends
  • Author:
  • Origin:
  • Time of issue:2021-01-19 15:56
  • Views:
Information
Due to the moisture absorption of nylon film and the series of adverse consequences caused by moisture absorption, there are certain requirements for the environment of paper-plastic packaging manufacturers. Generally, it should be stored at about 23°C, ±3°C, and the dry humidity difference is ideal within the range of 60%RH±5%RH. The nylon membrane cannot be placed directly on the floor or in the open air to avoid moisture absorption. The difference between dry and wet in the production environment generally does not exceed 75% RH. If it reaches 80% RH, production should be stopped (especially compound production) to avoid bad causes. If the task must be put into production, exhaust fans and dehumidifiers can be added to the production site to enhance indoor air circulation and reduce the humidity of the production environment to below 70%RH for reproduction. In short, when the humidity exceeds 70%RH, you must use it with caution. When the temperature is low or the humidity is too high, you must turn on the preheating equipment of the printing and laminating machine, first preheat the nylon film, and dry it on the surface of the nylon film. In order to facilitate the smooth progress of printing and composite production; at the turn of winter and spring, due to large temperature changes, when using mixed solvents, pay attention to effective adjustments with changes in temperature to prevent solvents from evaporating too fast or residual solvents. More quality accidents.
 
The workshop environment control can keep the humidity at 50%～60%RH, and the temperature in summer is 20～22℃. This is because the printing workshop will generate a lot of heat release during the production process, and controlling the temperature and humidity is to ensure the printing quality primary condition.
 
In the dry and solvent-free composite processes, different types of two-component polyurethane adhesives have different sensitivity to water and alcohols. Exceeding the range may cause non-dry phenomenon. If the sensitivity exceeds the range, (the higher) the flexibility will be worse, and the composite product will sometimes become hard and brittle. Therefore, it will seriously affect the composite effect. This is because the solvent-free polyurethane adhesive contains NCO groups that can react with active hydrogen atoms. These reactions will consume isocyanate, reduce the amount of reaction in the glue, and release carbon dioxide. Making the adhesive layer contain bubbles is extremely unfavorable for compounding, and will also cause the surface to be dry or the bonding strength to decrease. For materials with strong moisture absorption such as nylon film and cellophane, the residual solvent and humidity in the air should be strictly managed and controlled after printing.
 
In the nylon film family, PA6 film has the largest water absorption rate, and the saturated water absorption rate can reach about 9%. After the two-way stretched nylon film is damp and absorbs moisture, in addition to wrinkling, it will also stretch horizontally and shrink vertically, and it will increase with humidity The elongation becomes larger, and the maximum elongation can reach 1.5%. If the humidity is 75%RH, the horizontal elongation is about 0.37%, and the longitudinal direction is -0.28%; if the humidity rises to 85%RH, the horizontal elongation is 0.5% and the longitudinal direction is -0.38%. After the nylon membrane absorbs moisture, its stress-strain curve changes significantly. After the nylon membrane absorbs moisture, it will not have a great impact on the corona effect, but it will have a great impact on the adhesion of the ink and the adhesive. Generally, when the moisture content of the nylon film exceeds 3%, it will not only affect the adhesion of the ink and the adhesive, but also make the film feel hard, and the surface will turn yellow and affect the appearance. Therefore, special attention should be paid to flexible packaging color printing plants to prevent the nylon film from being damp and absorbing.
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Environmental temperature and humidity control requirements in the workshop of packaging manufacturers [ 2021-01-19 ]
Due to the moisture absorption of nylon film and the series of adverse consequences caused by moisture absorption, there are certain requirements for the environment of paper-plastic packaging manufacturers. Generally, it should be stored at about 23°C, ±3°C, and the dry humidity difference is ideal within the range of 60%RH±5%RH. The nylon membrane cannot be placed directly on the floor or in the open air to avoid moisture absorption. The difference between dry and wet in the production environment generally does not exceed 75% RH. If it reaches 80% RH, production should be stopped (especially compound production) to avoid bad causes. If the task must be put into production, exhaust fans and dehumidifiers can be added to the production site to enhance indoor air circulation and reduce the humidity of the production environment to below 70%RH for reproduction. In short, when the humidity exceeds 70%RH, you must use it with caution. When the temperature is low or the humidity is too high, you must turn on the preheating equipment of the printing and laminating machine, first preheat the nylon film, and dry it on the surface of the nylon film. In order to facilitate the smooth progress of printing and composite production; at the turn of winter and spring, due to large temperature changes, when using mixed solvents, pay attention to effective adjustments with changes in temperature to prevent solvents from evaporating too fast or residual solvents. More quality accidents.
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