In low-temperature autumn and winter environments, many pipe manufacturers encounter production challenges such as dull pipe surfaces, significant wall thickness deviations, unstable output, and pipe brittleness or deformation. These issues are not caused by equipment failure; rather, the drop in ambient temperature significantly alters raw material moisture content, melt flow characteristics, and cooling efficiency. Standard processing parameters used at normal temperatures are no longer suitable, necessitating specific adjustments for low-temperature operations. Drawing on years of on-site commissioning experience, Benk Machinery shares practical solutions for adapting PP pipe production line to low-temperature conditions, ensuring stable, high-volume output throughout the year.

Raw Material Pre-treatment for Low-Temperature Environments

1. Constant-Temperature Drying and Dehumidification

In winter, high air humidity and significant day-night temperature fluctuations make PP raw materials prone to moisture absorption and low temperatures. Feeding cold material directly into the machine causes delayed plasticization and uneven melt quality. Before production, the constant-temperature drying time must be extended to ensure the material’s temperature and moisture content meet standards, thereby minimizing quality issues like pinholes, pitting, and dull surfaces at the source.

2. Constant-Temperature Storage in the Raw Material Workshop

Avoid storing raw materials outdoors whenever possible; feeding cold material directly into the machine can easily cause fluctuations in extrusion parameters. Keeping the raw material temperature close to the production environment temperature significantly improves extrusion stability and reduces the scrap rate during startup.

Extrusion Main Unit Parameter Adjustments for Low Temperatures

1. Fine-Tuning Zonal Temperatures

Summer parameters cannot be applied directly to low-temperature production. Temperatures in the feed and plasticization zones should be moderately increased to compensate for heat loss to the environment and ensure the PP material melts and plasticizes fully. Die temperatures should be raised slightly and steadily to prevent insufficient melt flow, which could otherwise lead to rough pipe surfaces or intermittent output.

2. Matching Screw Speed ​​with Feeding Rate

Since the melt encounters greater resistance at low temperatures, the screw shear speed can be appropriately reduced and the feed flow stabilized. This prevents fluctuations in barrel pressure and ensures uniform, steady output.

Cooling and Sizing System Adaptations for Low Temperatures

In winter, low cooling water temperatures and rapid cooling rates can lead to uneven cooling—where the exterior cools faster than the interior—resulting in residual stress and subsequent pipe warping or deformation. To ensure synchronous cooling of the pipe’s inner and outer layers, the baseline cooling water temperature should be raised, the water circulation flow rate reduced, and the sizing speed slowed down; this results in greater dimensional precision and enhanced stability.

Overall Equipment Adaptation and Optimization

In low-temperature conditions, resistance within the equipment’s drive and lubrication systems increases. It is recommended to run the machine at low speed for 5–10 minutes to warm it up before ramping up to production speeds. Benk Machinery’s high-speed PP pipe production lines feature an adaptive temperature control system that effectively mitigates the impact of low ambient temperatures, ensuring stable, year-round production.

Conclusion

The keys to maintaining stable PP pipe production machine in low temperatures are raw material preheating, process temperature adjustment, gradual cooling for sizing, and equipment preheating. Properly implementing these process adjustments can completely resolve the issue of high defect rates during winter production. Benk Machinery offers technical support—including low-temperature process tuning and equipment upgrades—to ensure efficient and stable production throughout the winter.

FAQ

Q1: Why does the surface of PP pipe appear dull and rough in winter?

A: Causes include low ambient temperatures, feeding cold raw materials into the machine, and insufficient plasticization leading to poor melt flow.

Q2: Should extrusion temperatures be raised for low-temperature production?

A: Yes, the temperature in the plasticization zone requires moderate adjustment to compensate for heat loss to the environment and ensure thorough plasticization.

Q3: Does colder cooling water result in better pipe sizing in winter?

A: No. Rapid cooling generates internal stress, which can easily lead to pipe deformation or warping.

Q4: Why is the scrap rate higher when starting up in low temperatures?

A: Significant temperature differences between the equipment, raw materials, and cooling water—combined with unadjusted parameters—result in unstable production conditions.

Q5: Are Benk pipe production lines suitable for low-temperature winter production?

A: Yes, the entire range of pipe production lines is designed to handle both high- and low-temperature operating conditions and supports specific process tuning for low-temperature environments.

Why Choose Benk Machinery?

From individual machines to complete production lines, Benk Machinery provides reliable and customized plastic processing solutions. Since 2012, we have focused on plastic extrusion, nergy-saving plastic recycling machine, and automated compounding centralized feeding systems, helping customers build efficient and cost-effective production facilities.

• Complete Extrusion Solutions: Professional expertise in plastic pipe, profile, sheet, plate and board extrusion lines.
• Customized Project Solutions: Equipment and production lines can be configured according to your materials, products, capacity and factory requirements.
• Stable & Cost-Effective Equipment: Reliable machine performance, efficient production and optimized energy consumption help reduce operating costs.
• Professional Service: From technical consultation and production to installation, commissioning and after-sales support, our team provides complete project assistance.

Contact Benk Machinery:

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• Email: [email protected]
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