What Does The Process Of HDPE Pipe Fittings Need To Pay Attention To?

Introduction:

HDPE Compression Fittings have emerged as an essential component in fluid transportation systems, transforming the landscape of pipe connections and securement. This advanced solution boasts a multitude of benefits, positioning it as the preferred choice across diverse industries and applications.

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The key parameters that need attention in the extrusion molding process of HDPE pipe fittings mainly include the following aspects:

Temperature control:

• Temperature is one of the important conditions for extrusion molding to proceed smoothly.
• Depending on the melt flow rate of the HDPE raw material, different control temperatures need to be determined. HDPE crystallinity is high, crystallization melting potential heat is large, so the molding temperature is usually higher than LDPE.
• The body temperature, head temperature and die temperature need to be adjusted according to the specific process requirements. In general, the body temperature range of HDPE may be 100~120 ° C, the head temperature range is 120~140 ° C, and the rear, middle and front temperature may be higher, reaching 160~180 ° C. The die temperature is usually lower than the maximum body temperature to ensure that the melt viscosity of PE material is low, the molding temperature range is wide, and the production efficiency is improved and energy is saved.

Cooling control:

• The cooling process has an important impact on the production process and product quality. HDPE pipe fittings need to be gradually cooled after forming, otherwise the surface may be dull and easy to produce internal stress.
• Parts of the cooling control include the hopper, sizing jacket and cooling water tank. The hopper is provided with a jacket with cooling water to prevent premature adhesion of PE particles by heat. The sizing sleeve and cooling water tank also need to be properly cooled to ensure that the shape of the pipe is stable and the internal stress is reduced.

Extrusion rate:

• Extrusion rate is the quality or length of the plastic extruded by the extrusion die per unit time, which represents the level of extrusion production capacity.
• The size of the extrusion rate is affected by many factors, including the structure of the head, screw and barrel, screw speed, heating and cooling system structure and plastic characteristics. Adjusting screw speed is the main measure to control extrusion rate.

Pressure control:

• In the extrusion process, due to the resistance of the material flow, the change of the depth of the screw groove and the obstruction of the filter screen, the filter plate and the mouth die, a certain pressure will be generated.
• The appropriate pressure is one of the important conditions for the plastic to become a uniform melt and obtain dense plastic parts. However, too much head pressure will affect the output, so it needs reasonable control.

Raw material preparation:

• The raw material preparation of HDPE pipe fittings is the beginning of the process, and it is necessary to ensure that the HDPE resin is evenly mixed with the necessary additives (such as antioxidants, UV stabilizers).

Sizing method:

• Large diameter pipe adopts internal pressure legal diameter, small diameter pipe adopts vacuum sizing method. Both methods need to control the corresponding parameters, such as the size of internal pressure and vacuum degree, to ensure the roundness and dimensional accuracy of the pipe.

In summary, the key parameters that need to be paid attention to in the extrusion molding process of HDPE pipe fittings include temperature, cooling, extrusion rate, pressure and raw material preparation. The control of these parameters will directly affect the quality and production efficiency of the product.