The temperature control of the nylon cooking machine needs to be combined with the material characteristics and process objectives, and precise temperature control can be achieved through segmented control, intelligent algorithms, and coordinated optimization of air volume. At the same time, air volume adjustment is used to promote steam circulation and humidity control, ensuring that the nylon material absorbs moisture uniformly and avoids thermal deformation.
Heating rate control strategy
Segmented heating control
Nylon steaming requires setting multiple heating curves based on the material type (such as PA6, PA66). For example, in the initial stage, slowly raise the temperature to 60 ℃ at a rate of 2-3 ℃/min to gradually stretch the nylon molecular chains; Accelerate to 5 ℃/min and increase to 85 ℃ in the middle stage to promote water molecule permeation; In the final stage, fine tune to the target temperature (such as 95 ℃) at a rate of 1-2 ℃/min to avoid local overheating and material degradation. This strategy can reduce thermal stress and improve moisture absorption uniformity.
Intelligent temperature control algorithm
Using PID control combined with inverse line table technology, dynamically adjust the starting point of temperature rise based on the initial temperature. For example, if the initial temperature is higher than the set curve starting point, the system automatically calculates the actual starting point and shortens the preheating time to avoid prolonged cooking time due to temperature lag. Meanwhile, through precise control of temperature fluctuations of ± 0.5 ℃ and deviations of ± 2.0 ℃, the consistency of material processing for each batch is ensured.
Optimization strategy for air volume
Circulating wind promotes uniform distribution of steam
During the cooking stage, the steam cycle is driven by a fan to evenly permeate the interior of the nylon material with high-temperature steam. For example, maintaining a wind speed of 0.5-1m/s at 85 ℃ and 95% RH can eliminate local humidity differences and avoid insufficient or excessive moisture absorption. The design of the air volume control plate and limit rod can accurately control the air volume and prevent temperature stability from being affected by wind speed fluctuations.
Collaborative control of air volume and temperature rise
The heating rate and air volume need to be dynamically matched. For example, during the rapid heating stage (5 ℃/min), increase the air flow to 2-3m/s to accelerate heat transfer; Reduce the air flow to 0.3-0.5m/s during the insulation stage to minimize heat loss and maintain humidity stability. In addition, through the design of temperature regulating ports and temperature regulating plates, the mixing ratio of steam and air can be further adjusted to optimize the moisture absorbing environment.