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.

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

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.

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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.

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.

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.

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.

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.

(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.)