Protection and measures for digital printing workshops in winter
With the arrival of winter, the temperature in many places across the country continues to drop. Sudden temperature drops can directly affect equipment operating status, ink flow, paper performance, and finishing quality, leading to reduced productivity, higher costs, and quality fluctuations. While paying attention to their own warmth, all printing company bosses should also pay attention to the cold protection and warmth measures of the digital printing workshop at any time to ensure that all aspects of printing can operate normally in a suitable environment.
Environmental control: Create a constant temperature and humidity production space
Digital printing has strict requirements for the production environment, of which temperature and humidity control is the core link. The ideal production environment should be maintained in the range of temperature 18~22°C and relative humidity 50%~60%. To achieve this, the following measures are recommended:
01
Tightness check
The workshop should conduct tightness inspections, focusing on repairing the gaps in doors and windows to prevent direct intrusion of cold air. Insulation curtains can be installed in the passages where people enter and exit frequently, and enterprises can also consider installing insulation partitions in the equipment area to form a stable microenvironment.
02
Heating equipment inspection
The choice of heating equipment is crucial. Although traditional radiators can heat up, they can easily cause uneven temperature inside the workshop, so it is recommended to use industrial constant temperature air conditioning systems to achieve precise temperature control. It is important to note that all heating equipment should be kept away from paper storage areas and printing materials to avoid local overheating problems.
03
Humidity check management
Humidity management should also not be ignored. In the northern region, indoor humidity often drops below 30% after winter heating, and industrial humidifiers must be equipped at this time. Modern ultrasonic humidifiers offer ±5% accuracy control, making them ideal for print shops. For enterprises with limited budgets, auxiliary humidification can also be carried out by setting up a water curtain system in the workshop or regular sprinkling of water.
Paper management: protection from storage to use
As the carrier of printing, the performance of paper is most obviously affected by temperature. When the ambient temperature is lower than 10°C, the paper fibers will become brittle due to low temperature, and the tensile strength and surface strength will decrease significantly.
01
Paper storage solutions
(1) Establish a buffer transition zone: New paper should be stored in a transitional warehouse at 10~15°C for 24 hours, and then transferred to a constant temperature workshop. This process allows the paper fibers to slowly adapt to temperature changes and avoid thermal expansion and contraction caused by rapid temperature changes.
(2) Three-dimensional storage management: paper should be stored off the ground, using special shelves, and keeping a distance of more than 20cm from the wall to ensure air circulation. Special attention should be paid to the fact that paper of different quantities and specifications should be stored separately and clearly marked.
(3) Accurate temperature and humidity monitoring: Install temperature and humidity sensors at different locations of the paper bank to achieve 24-hour uninterrupted monitoring. When the humidity is below 45%, humidification measures should be started immediately, and ventilation should be strengthened when it is higher than 65%.
01
Paper usage scheme
(1) Preheating: Transport the required paper to the workshop at least 24 hours before printing to fully adapt the paper to the production environment. For particularly sensitive art paper and special paper, it is recommended to extend the warm-up time to 48 hours.
(2) Segmented unpacking: Do not dismantle all packaging at once, but unpack in batches according to the production progress to minimize the time the paper is exposed to the dry environment.
(3) Print and wrap: The printed product should be immediately wrapped and sealed with PE film to prevent moisture loss and deformation of the paper. For products that require subsequent processing, it is recommended to set up a special laminating and binding area in the workshop to achieve seamless connection of the process.
Static electricity prevention and control: comprehensive solution in many aspects
In dry winter environments, static electricity problems are particularly prominent. In addition to affecting normal paper feeding, static electricity can cause toner to scatter and absorb dust, which can seriously affect print quality, so the following preventive measures are recommended.
01
Environmental regulation
Keeping the humidity in the production area in the ideal range of 55%~65% is the most effective way to control static electricity.
02
Ground the equipment
Regularly check the grounding of all printing equipment and paper holders to ensure that the grounding resistance is less than 4Ω.
03
Material selection
Prefer to use anti-static treated paper or use an anti-static spray on the surface of the paper.
Ink system: refined temperature control management
Digital printing inks are extremely sensitive to temperature, and low temperatures can lead to increased viscosity, poor fluidity, poor ink supply, clogged printheads, increased color aberrations, and even damage to expensive printheads.
01
Ink storage management
(1) Establish a constant temperature ink library: set up a special ink storage area, and the temperature is strictly controlled between 15~25°C.
(2) Use a constant temperature storage cabinet: For opened ink, it should be stored in a professional thermostatic cabinet to avoid direct sunlight.
(3) Standardize inventory management: Strictly implement the principle of "first-in, first-out", establish detailed ink storage and usage records, and ensure inventory turnover.
02
Pre-treatment before use
(1) Progressive temperature recovery: After moving the ink in the low temperature environment to the workshop, it needs to be left for 6~8 hours to let it reheat naturally, and do not heat it directly.
(2) Constant temperature water bath: For urgently needed ink, a constant temperature water bath of 25~30°C can be used for slow heating, and the time is controlled within 2 hours.
(3) Viscosity testing: Before use, be sure to use a viscometer to check the ink viscosity, and add a special diluent to adjust it when it exceeds the standard range.
03
Printhead maintenance
(1) Increase warm-up time: In winter, the equipment warm-up time should be extended to more than 30 minutes to ensure that the printhead reaches the optimal operating temperature.
(2) Regular cleaning: increase the frequency of printing head cleaning, and it is recommended to perform an automatic cleaning program every 4 hours of printing.
(3) Night insulation: Turn on the low-temperature insulation mode of the equipment during non-working hours to prevent the ink inside the print head from solidifying.
UV varnish and finishing: seasonally adjusted formulations
The viscosity of UV varnish will increase significantly in low temperature environments, leading to problems such as poor leveling and incomplete curing. Professional coping strategies include:
01
Temperature management
Establish a constant temperature circulation system: The UV varnish is heated by a constant temperature water bath device to stabilize the use temperature at 25~30°C.
02
Pipe insulation
All transmission pipelines are insulated to prevent heat loss. Stir mechanically for 10~15 minutes before use to ensure uniform ingredients.
03
Recipe selection
Modern UV varnishes have developed different formula systems for winter and summer, so be sure to choose the corresponding formula according to the season.
The winter formula has a lower curing agent content and an increased leveling agent ratio to ensure good leveling and curing results in low-temperature environments. Summer formulations cure faster and are more resistant to high temperatures.
Winter formulas can lead to incomplete curing and anti-sticking when used in summer; Summer formulas used in winter will cause quality problems such as poor leveling and foaming.
Comprehensive Equipment Maintenance: Develop a winter maintenance plan
In addition to the above special measures, it is also necessary to carry out comprehensive winter maintenance of production equipment:
01
Drivetrain
Replace the special lubricating oil in winter to ensure good lubricating performance in low temperature environments. Check the tension of all transmission belts, low temperature will cause the transmission belt to shrink, affecting the transmission efficiency.
02
Electrical system
Strengthen circuit inspection, pay special attention to the working status of heating elements. Add a dehumidifier in the control cabinet to prevent short circuits caused by condensation.
03
Ink supply system
Check the elasticity of all seals, cold temperatures can harden the sealing material and cause leakage. Increase the frequency of filter replacement to prevent abnormal ink supply pressure caused by increased ink viscosity.
The protection of the digital printing workshop during the cooling period is a systematic project, which needs to start from multiple dimensions such as environmental control, material management, equipment maintenance, etc., through the establishment of a scientific management system and a perfect emergency plan, enterprises can not only survive this winter smoothly, but also take this opportunity to improve the level of refined management and lay a solid foundation for future development.