In the actual production of 16-63mm PP pipes, many manufacturers hope to increase the plastic pipe production-line speed to increase production capacity. However, simply increasing the traction speed can easily lead to problems such as wall thickness deviation, pipe surface pitting, and unstable dimensions. Speed up is not just about raising parameters, it needs to be coordinated with the entire set of extrusion, cooling, and traction equipment. Based on on-site debugging experience, Benk Machinery shares several practical speed improvement points.

Optimization of extrusion host parameters to ensure stable feeding

1. Reasonable adaptation of screw and barrel temperature

PP raw materials are more sensitive to temperature, and the melting rate of the material increases after speeding up. Do not directly increase the overall temperature, moderately raise the temperature in the middle of the material barrel to ensure that the material is fully plasticized; The temperature of the machine head and die head is slightly adjusted to avoid the problem of insufficient melt fluidity causing the discharge to fluctuate quickly and slowly. Excessive temperature can cause degradation of the melt and the appearance of bubbles on the surface of the pipe.

2. Feed and screw speed matching

After speeding up, the screw speed synchronously increases, and the feeding speed cannot lag behind. Ensure smooth material discharge from the silo and avoid bridging and material breakage. If there is a fluctuation in the feeding, even if the traction speed is high, the size of the pipe will drift back and forth.

Adjustment of vacuum cooling and shaping system, core link for speeding up

1. The vacuum degree and cooling water volume increase synchronously

As the line speed increases, the residence time of the pipe in the shaping sleeve becomes shorter. It is necessary to moderately increase the vacuum degree of the vacuum tank and increase the flow rate of circulating cooling water to ensure rapid shaping of the pipes. Insufficient cooling can cause pipe ovality and outer diameter fluctuations, resulting in non-conforming cutting dimensions in the later stage.

2. Check the status of the standardized water circuit

Long term production of waterways is prone to scaling and blockage, leading to a decrease in cooling efficiency. Before speeding up, clean the water scale in the fixed sleeve waterway. Otherwise, even if the water volume is increased, the cooling effect will still not keep up, which is a point that many factories easily overlook.

Collaborative setting of traction cutting unit

The traction speed should be increased, and the compression force of the traction rubber block should be adjusted appropriately. If the pressure is too low, the pipe will slip, and if the pressure is too high, it is easy to damage the outer wall of the pipe. The traction and extrusion discharge speeds must be synchronized. If the speed difference is too large, the pipe will stretch and become thinner. The cutting system tracks and synchronizes with the line speed to avoid skewed cuts at high speeds. Benk Machinery’s 16-63mm PP, PE-RT, PPR high-speed extrusion production lines have undergone high line speed matching and debugging before leaving the factory, reducing the difficulty of on-site speed adjustment and debugging for customers.

Speed up precautions

Speed up needs to be gradually increased, with each slight increase in speed, observing the outer diameter, wall thickness, and surface condition of the pipe, and then continuing to increase after stabilizing. Do not directly increase the speed at once, as it may result in mass production of waste products. At the same time, pay attention to raw materials. When the content of recycled materials is high, the production line should not pursue too high a speed.

FAQ

Q1: What should I do if the wall thickness of the PP pipe production line becomes thinner after speeding up?

A: Properly increase the extrusion output, match the traction speed, and do not only adjust the traction.

Q2: What is the reason for the elliptical shape of the pipe after speeding up?

A: Most of them are due to insufficient cooling vacuum, increasing the vacuum degree and cooling water flow rate.

Q3: Can 16-63mm PP pipes be significantly accelerated in one go?

A: Not recommended, increase slightly and observe the stability of various indicators of the product before further improvement.

Q4: Does increasing the screw speed necessarily increase production?

A: It also requires a complete set of feeding, cooling, and traction, and the effect of a single screw adjustment is limited.

Q5: Will raw materials affect the maximum operating speed of the PP pipe production line?

A: Yes, the upper limit of line speed that can be achieved for new materials, modified materials, and recycled materials is different.

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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