Another common issue is flow marks, which appear as lines or patterns on the surface of the part, often caused by improper injection speed or cooling inconsistencies.

In packaging, films, and wraps made from LDPE offer excellent moisture barriers and durability, making them ideal for food and product packaging.

The temperature range for polyethylene injection molding varies based on the type of polyethylene. For LDPE, the melt temperature typically ranges from 180°C to 240°C, while HDPE is molded at temperatures between 246°C and 280°C. The mold temperature also varies, typically around 20°C to 60°C for LDPE and 45°C to 65°C for HDPE.

SUMIKASUPER LCP can be molded using both the standard inline type and plunger (preplasticating) type of injection molding machines. However, for E5000 series, it requires a higher molding temperature (up to 420°C), and thus the injection molding machine with high temperature specifications (450°C) is required.

With its versatility across industries from consumer goods to industrial components, PE remains a key material in modern manufacturing.

Its broad application scope stems from its flexibility, chemical resistance, and ease of processing, making it a go-to material across industries.

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(As shown above, when compared to general-purpose molding machine, the high speed molding machine provides the high injection speed in the initial period and thereafter molding is performed at the specified injection speed.)

As SUMIKASUPER LCP has a rapid solidification nature when cooled, it does not easily cause flashes during injection molding although its melt viscosity is very low. However, when molding ultra-thin-walled products (< 0.2mm), there are cases where the resin solidifies in the thin-walled part and sufficient flow length cannot be obtained. As a countermeasure in such cases, the injection molding machines with high speed and excellent injection response characteristics, such as electric injection molding machines or hydraulic injection molding machines with accumulators, are effective.

In agriculture, PE plays an essential role, particularly through products like irrigation tubes, which require the material’s weather resistance and flexibility.

The cooling system must also be optimized to prevent variations in part density, especially when working with LDPE, which has higher flexibility but lower rigidity than HDPE.

Polyethylene (PE) is a thermoplastic polymer derived from the polymerization of ethylene, a by-product of petroleum refining.

In the industrial sector, PE is used to manufacture pipes, which are valued for their corrosion resistance and flexibility.

PE is also prominent in medical devices, where its low toxicity and sterilization capabilities make it suitable for products like catheters and other components.

Its soft nature and high elongation also allow it to absorb impact without breaking, although its mechanical strength varies depending on its density.

Keep reading to discover the key insights on PE injection molding, explore its unique properties, and learn why it’s the go-to material for countless industries.

E = Excellent : Application examples to SUMIKASUPER LCP are available. G = Good : Applicable to SUMIKASUPER LCP. A = Average : There are no examples of application to SUMIKASUPER LCP. B = Bad : Not applicable to SUMIKASUPER LCP

Plastic bottles, from water bottles to detergent containers, are often made of PE, particularly HDPE, due to their moisture resistance and strength.

Yes, polyethylene (PE) can be injection molded. It is one of the most commonly used thermoplastics in injection molding due to its versatility, flexibility, and cost-effectiveness. Both high-density polyethylene (HDPE) and low-density polyethylene (LDPE) are frequently used in various applications, from packaging to industrial products.

During long-term continuous molding, resin can remain in dead spaces inside the molding machine, and the remaining resin may deteriorate or become colored. LCP can easily remain in such dead spaces since it has an extremely low melt viscosity. Therefore, when applying hot runners, it is necessary to pay sufficient attention to prevent black spots and cold slag caused by resin retention.

The system must be capable of producing high levels of heating with a uniform temperature distribution. Heater integrated type is preferable. The manifold and nozzle temperatures should not be maintained too high. The areas coming into contact with the mold (gate areas) must be maintained at high temperatures.

Since the properties of SUMIKASUPER LCP molded products are highly dependent on the resin temperature during molding (cf. Figure 4-1-2), it is necessary to mold SUMIKASUPER LCP at an appropriate resin temperature. On the other hand, as the standard molding temperature for SUMIKASUPER LCP is extremely high (320 to 400°C), there may be a discrepancy between the setting temperature of the molding machine and the actual resin temperature. In this case, the potential of SUMIKASUPER LCP can not be fully utilized. In order to prevent such problems, it is recommended that the resin temperature in the cylinder be monitored. The actual resin temperature can be measured, for example, by using an infrared radiation thermometer that can measure the temperature of a small area.

It offers excellent flexibility, chemical resistance, and electrical insulation, which makes it ideal for applications in harsh environments.

Below is a comparison of PE with PP and nylon, covering key factors such as cost, flexibility, strength, and common uses:

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In the medical field, PE tubing is commonly used in various medical settings, thanks to its flexibility, chemical resistance, and sterilizability.

As the weld strength of SUMIKASUPER LCP is lower than that of other engineering plastics, it is necessary to limit the number of gates to only 1 to 2 places and give careful consideration to where to locate the gate, in order to avoid the formation of welds.

For HDPE, molds must account for the higher shrinkage rates of up to 4%, which can lead to warping or dimensional inaccuracies.

Yes, polyethylene can be molded using various methods, with injection molding being the most popular. Its ability to melt and flow easily when heated makes it an excellent choice for creating a wide range of products. The flexibility of LDPE and the strength of HDPE allow for diverse applications, from everyday items to specialized industrial components.

The key difference between polypropylene (PP) and polyethylene (PE) injection molding lies in their properties and applications. Polyethylene is more flexible and has better chemical resistance, making it ideal for containers, packaging, and films. On the other hand, polypropylene is stiffer and has higher heat resistance, making it more suitable for automotive parts, textiles, and household goods.

When SUMIKASUPER LCP is molded by injection molding, its molecules can be easily oriented in the flow direction due to shear flow. As a result, a molded product with high strength and modulus can be obtained, but at the same time, it must also possess anisotropy. It is important to pay close attention to how the flow pattern in the cavity will be when designing the mold.

Polyethylene comes in different grades, such as LDPE (Low-Density Polyethylene), HDPE (High-Density Polyethylene), and other variants, each having unique properties.

Polyethylene (PE) injection molding is widely utilized in various industrial applications due to its versatility and durability.

Polyethylene (PE) injection molding is a crucial process used to create versatile, durable plastic products across various industries.

Storage containers made from PE provide excellent chemical resistance, making them ideal for handling various industrial liquids.

Polyethylene injection molding offers flexibility, durability, and cost-efficiency, making it one of the most popular methods for producing a wide range of products.

When considering injection molding materials, it’s essential to compare polyethylene (PE) with other commonly used thermoplastics like polypropylene (PP) and nylon.