200m/min
High-speed drying design target
Requires press-specific trials with the actual substrate and ink.
Hangzhou Yuehua · Water-based gravure drying
Drying systems,
engineered around the process.
We design and adapt water-based ink drying systems around preheating, zoned airflow, moisture removal, heat recovery and heat-pump integration. Each proposal is evaluated against the press, web width, ink, substrate and site conditions.
200 m/min design target
35 kW rated electric heater
Heat-pump option
Targets, rated configurations and historical field records are identified separately; final performance requires site verification.
HeatAirflowMoisture removalControl
Key design parameters
Every figure has
a defined boundary.
These are design targets and equipment configurations, not verified acceptance results for every press. Final capability depends on the material, ink, airflow and site conditions.
±0.05mm
Registration stability validation target
Not a confirmed achievement or customer acceptance result.
35kW
Rated main electric-heater configuration
Final heating capacity and operating sequence require engineering review.
65%
Heat-exchanger design efficiency
Actual field efficiency has not been verified and depends on structure and operating conditions.
≈6HP
Heat-pump expansion option
Heating/cooling capacity and water temperature are subject to engineering calculation.
Diagnose first, retrofit second
Break the problem into
measurable parameters.
Before quoting any kit, we measure what the oven is actually delivering against the job the line asks it to do.
Drying capacity
Cross-check oven length, effective temperature, nozzle velocity, and per-color drying budget before turning any knob.
Exhaust balance
Confirm the wet-air path can keep up under humidity; in many plants this, not heat, is the real ceiling on speed.
Process fit
Match the retrofit to web width, color count, ink system, and target speed; sometimes the answer is a process tweak.
Six coordinated technologies
Find drying capacity
across the whole system.
Preheating, main heating, airflow, moisture removal and energy recovery are assessed together. The retrofit scope is set against the equipment on site.
Low-disturbance preheating
Gradually warm the wet ink film before the main drying zone to reduce the risk of disturbance from high-velocity air.
Gradient negative-pressure drying
Coordinate zoned supply air, return flow and exhaust to improve cross-web distribution and limit substrate disturbance; verify results on site.
Line-speed coordination and interlocks
The PLC concept links line speed, temperature, airflow and moisture removal. Control points and protective actions depend on the equipment and site review.
Diamond-pattern aluminum heat exchanger
Nominal outside dimensions are about 50 × 50 cm, with 65% design efficiency. Effective ventilation area and actual efficiency require engineering verification.
Preheating and chilled-water cooling
An approximately 6 HP heat pump can preheat fresh air through its condenser and serve a separate closed chilled-water loop through its evaporator. Capacity and water temperature require calculation.
35 kW electric heating
The rated 35 kW main-heater configuration provides an independent heat source when heat recovery is insufficient or the heat pump is offline.
Drying electrical and automation system
Coordinate line speed,
temperature, airflow and load.
This is a proposed PLC control framework: electric heat secures drying, the aluminum exchanger recovers exhaust heat first, and the heat pump responds to actual heating and cooling loads. Sensors, I/O points, thresholds and actions require equipment-specific engineering and a site safety review.
Line-speed feed-forward
Coordinate fresh-air preheating with line speed and preheat-zone temperature to reduce excessive airflow disturbance before the ink film sets. Actual signals and actuators depend on the equipment.
Temperature feedback and electric backup
Retain the rated 35 kW heater as the main heat source and temperature trim. The PLC can coordinate heater stages or power output using oven temperature and line speed where the installed hardware supports it; 80°C is an operating target example.
Gradient pressure and moisture removal
Coordinate zoned supply air, exhaust, negative pressure and moisture removal. Heating should be inhibited if fan operation or proven airflow is outside its permitted state; zone targets require site commissioning.
Monitor the aluminum exchanger
Use fresh-air and exhaust-side temperature and airflow signals to assess recovery, prioritizing available recovered heat. The 65% figure is a design value; actual performance needs verification under stable conditions.
Use heating and cooling when loads match
The planned approximately 6 HP heat pump uses its condenser for fresh-air preheating and its evaporator for a separate closed chilled-water loop serving fan-coils near the press. Dispatch depends on usable cooling demand and a matching heat load; 50°C is a target to be calculated.
Fault detection and safe shutdown
The protection design should cover overtemperature, fan or exhaust faults, insufficient airflow or water flow, and heat-pump faults, with defined heater cut-off, equipment stops and safe ventilation actions.
PLC energy dispatch examples
Recover heat first, keep electric heat in reserve, use the heat pump on demand.
The controller may use line speed, oven-zone temperatures, exchanger conditions, heat-pump hot- and cold-side temperatures, chilled-water supply/return status and cooling demand around the press. Actual signals depend on the sensors, actuators and PLC configuration.
Startup checks
Confirm supply/exhaust fans and proven airflow before enabling heat; if heat-pump cooling is requested, also confirm the closed water loop.
Steady production
Maintain process temperature, prioritize exhaust heat recovery and use the 35 kW heater to trim the remaining heat load.
Cooling demand near the press
Run the closed chilled-water loop and fan-coils; dispatch the heat pump according to cooling demand and usable condenser heat.
No load or a fault
Unload or stop the heat pump without a useful heating/cooling load; enter the protection state defined by the safety review if a fault occurs.
Heating and cooling system
Three circuits,
coordinated by design.
This is a functional flow illustration. Temperatures, airflow, equipment capacity and safety interlocks require engineering calculation for the actual equipment and site.
01
Fresh-air heatingFRESH-AIR HEATING
- 25°C fresh airInlet air
- Heat-pump condenserPreheat target about 50°C; subject to calculation
- Diamond aluminum exchangerRecovers heat from exhaust
- 35 kW electric heaterMain-heating temperature trim
- Drying oven80°C operating target
02
Exhaust heat recoveryEXHAUST HEAT RECOVERY
- 80°C dryer exhaustAt the oven outlet
- Aluminum heat exchangerTransfers heat to incoming air
- Exhaust treatmentDischarge per site safety requirements
03
Independent chilled-water coolingCLOSED CHILLED-WATER LOOP
- Heat-pump evaporatorProduces cooling
- Closed chilled-water loopIndependent circuit
- Nearby fan-coil unitsLocal supplemental cooling
- Return waterFlows back to the evaporator
About · Hangzhou Yuehua
From Wenzhou Yaohua to Hangzhou Yuehua,
three decades with gravure printers.
Hangzhou Yuehua Printing & Packaging Machinery Co., Ltd. traces its roots to Wenzhou Yaohua, established in 1992. For more than three decades, we have focused on R&D, manufacturing and field service for flexible-packaging gravure and laminating equipment, from earlier manual presses through today’s servo-driven electronic-shaft models.
As environmental requirements evolve, many printers are evaluating the move from solvent-based to water-based ink. Drying performance depends on more than oven temperature: airflow, moisture removal, substrate, ink and production conditions all matter.
Our water-based ink drying work has developed from heat-pump trials into a system approach covering heat, airflow, exhaust, heat recovery and control interlocks. We help printers assess equipment options for the solvent-to-water transition.
Equipment showcase
See the layout,
then size the retrofit.
This illustrative 3D preview shows the general equipment layout, duct interfaces and service clearances. It is not a customer-site installation or acceptance video. Final configuration depends on your press model, web width, color count and site conditions.
Request a fit reviewIllustrative 3D equipment view · 5 seconds · not customer acceptance evidence
Field evaluation checklist
Bring these six data points
and the call is quicker.
- 01Press make, model, and color count
- 02Web width, current speed, target speed
- 03Ink system: water-based or alcohol-water
- 04Oven length per zone and set temperature
- 05Fan configuration, airflow, exhaust arrangement
- 06Where in the process the issue appears
Technical topics
Start with the right
engineering question.
English technical briefs are being prepared. For a current line, send the six field data points and we will return the relevant diagnostic path first.
Speed still unstable?
Start with drying capacity, exhaust balance, and process window before assuming the ink is to blame.
Request an English brief →Is an oven retrofit worth it?
Six field data points make the retrofit value and scope much easier to judge.
Request an English brief →Why does humidity change drying?
Look at inlet air, exhaust balance, zoning, and material handling around a humid plant.
Request an English brief →Where does energy go?
Match airflow, temperature, exhaust, and heat recovery instead of chasing a single setting.
Request an English brief →Start the evaluation
Send your line data,
we will tell you whether a retrofit is worth it.
Please include press model, color count, web width, current and target speeds, and the ink system you run or plan to run. We respond with a retrofit value and direction first, before any equipment quote.
Technical contact
Mr. Dong
For discussions on water-based ink drying, oven air path, or exhaust balance fit-up, please reach out by phone or WeChat.
Contact: Mr. Dong
Tel / WeChat: +86 186 5813 5055
Tel / WeChat: +86 186 5813 5055