PE injection pipe fittings features

Table of Contents

Polyethylene pipe fittings are an important part of any PE pipe system. Injection-molded PE pipe fittings come in a wide variety of sizes and shapes, from simple to complex. 

PE pipe fittings can be used for a variety of applications, from low-pressure drainage to high-pressure piping systems. PE pipe fittings are available in a variety of stiffness ratings, from flexible to rigid.

Polyethylene pipes fittings can be joined by hot fusion, electrofusion, or mechanical connectors. Polyethylene pipe fittings are also available in a variety of joining systems including solvent weld, butt fusion, and electrofusion. PE pipe fittings are an important component of any PE pipe system.

Injection molded HDPE pipe fittings are available in a wide range of sizes and shapes, from simple to complex. PE pipes fittings are used in a various range of applications, from low-pressure drainage to high-pressure piping systems. Polyethylene tube fittings are popular in a variety of stiffness ratings, from flexible to rigid.

In this blog post, we will discuss the features of Injection-molded PE pipe fittings and explain why they are such a popular choice for plumbing systems.

PE Pipe Fittings

Characteristics of PE injection pipe fittings

1. Good corrosion resistance to corrosion, acid and alkali corrosion, and chemical corrosion

2. Long service life, 80 years, depreciation cost much lower than steel pipe

3. Easy construction, easy transportation

4. Strong flexibility

5. Good impact resistance, elongation at break is 20 times that of steel; 63 good gas tightness, prevent gas, Shen Tong.

6. Good safety and stability and the application of buried sewerage pipelines more widely.

The design principles and ideas of PE injection molded pipe fittings

The design of injection molding fittings is mainly based on the structure of the product to determine the design of the pouring system is also based on the structure of the injection mold design.

The improvement of design principles and ideas is a vital way to improve the performance of HDPE pipe’s electrofusion fittings.

In principle, the length of the runner should be as short as possible to ensure smooth filling and shrinkage during the injection molding process, and the diameter of the runner should be as large as possible based on cooling and demolding.

According to experience, the design of the PE injection molding system is more suitable for the direct feeding of the main sprue, and the length of the main sprue should be as short as possible. In the new era, to ensure that the injection mold has a high molding accuracy.

In addition to the use of high-precision machining means to complete the manufacture of the steel mold, the rational design of the mold structure, injection flow balance design, cooling water channel efficiency design, etc.

Have been used in a large number of computer software, rapid prototyping, and other advanced technologies, based on the theory of precision injection molding to improve the traditional injection mold design and injection mold manufacturing process.

PE injection molding process of pipe fittings

The regulation of the PE injection molding process is very critical, not only to make the product full of molding, and the minimum amount of deformation but also to ensure that the surface of the product can not have defects such as fusion lines, or shrinkage.

The following is a summary of the experience of the PE injection molding process for the following points.

Temperature regulation

Molding temperature refers to the injection barrel temperature, mold temperature, etc. PE processing should pay special attention to the nozzle temperature, generally controlled at about 70% of the front-end temperature.

The temperature is too high, although the melt flow is better, there will be shrinkage or even shrinkage of the melt at the first cold material well, so that the toughness of the shank is poor, which is not good for the release of the oblique main channel.

The temperature is too low, although there is a cold material well, the impact on the product is not great, but it will make the first cold material well too much cold material, the bond is not firm, the strength of the shank is poor, which is not good for the release of the oblique main channel.

The mold temperature should be controlled at 40-65℃, at this time, the product quality is stable, the internal stress is small, and the indicators are good.

Selection of multi-stage injection molding process

The reason for choosing a multi-stage injection molding process is to open a second cold well, the purpose of which is to exhaust and eliminate the fusion marks of the product.

Due to the change in injection rate, which affects the location of exhaust and fusion, it is not meant to open the second cold well if this aspect is not considered.

By multi-stage injection process, the gas in the cavity can be eventually exhausted from the second cold raw materials well, and the cold material at the front pipe ends of the flow plastic material will be concentrated here.

Strict control of injection speed and pressure

The injection speed has a great influence on the surface quality and size of the product. Lowering the injection speed can ensure relatively uniform stress inside the mold, thus ensuring the stability of the part size, but too slow a speed will increase the surface stress and make the plating process worse.

If the injection speed is too fast, the melt-flowing process will be part of the gas, forming bubbles on the surface of the product, and the denseness of the product will be reduced, which will lead to shrinkage and small size.

The injection pressure setting is mainly to protect the injection mold and equipment, and the injection process control is based on speed control. If the injection pressure is too low.

If the injection pressure is too low, it will be injected at a constant pressure according to the set injection pressure, and the flow rate of the melt will be out of control.

Therefore, the injection pressure should be set slightly higher than the required pressure to ensure that the product quality is in a controlled state.

Downgrading the use of recycled material

In injection molding production, the condensate from the casting system accounts for a large proportion, and it is mostly ground into powder and recycled in the production.

Here it is worth noting that: in the process of recycling material, the molecular chain has been physically and chemically cross-chained, and the effective length of the molecular chain has become shorter.

After grinding, a large number of long chains are broken, making the intermolecular force greatly reduced; at the same time, there are many impurities and dust in the recycled material, increasing the internal stress of the product.

But its plasticization again, not only defective points, and the number of intermolecular chains and strength decline, these factors make the performance of recycled material is greatly reduced, seriously affecting the hydraulic test and drop test, so the recycled material should be downgraded.

Conclusion

With the widespread use of domestic PE injection molded pipe fittings in the field of gas and gaseous fuels drinking water supply. By the above methods of design and production of PE injection molding mechanical fittings, manufacturers in the process of two pipes development can be fewer detours.

To a large extent, to shorten the development cycle of pipe fittings, design, and manufacture of fittings suitable for PE pipes fittings in injection molding, pressure, cooling, and other process characteristics of the mold.

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